Chlorinated polyethylene, English name: Ethylene resin, CAS: 63231-66-3, chemical formula: C4H7Cl, molecular weight: 90.55138, density: 1.22g/mLat 25 ° C (lit.), MSDS.

High density polyethylene is a crystalline polymer. As the hydrogen atom on the molecular chain is replaced by chlorine, its crystallinity decreases, softens, and the glass transition temperature decreases. However, when the chlorine content in chlorinated polyethylene exceeds a certain value, the glass transition temperature increases. Therefore, the glass transition temperature and melting point of chlorinated polyethylene can be higher or lower than that of the original polyethylene. The molecular structure of chlorinated polyethylene contains a copolymer of ethylene-vinyl chloride-1,2-12-vinyl chloride. The chlorine content of ordinary chlorinated polyethylene is 25% to 45% (mass). Depending on the molecular weight, chlorine content, molecular structure and chlorination process of the resin, it can exhibit different properties from rigid plastics to elastomers. Chlorinated polyethylene has excellent weather resistance, cold resistance, impact resistance, chemical resistance, oil resistance and electrical properties, etc. At the same time, it has the dual properties of plastic and rubber, and has good compatibility with other plastics and fillers. Therefore, it can be filled with a large number of fillers, for example, 100 parts of resin can be filled with 400 parts of titanium dioxide or 300 parts of saponin (or carbon black). Chlorinated polyethylene with a chlorine content of more than 25% also has self-extinguishing properties. It can also be crosslinked with organic peroxides to obtain vulcanized polymers.

1. Heat aging resistance CPE is a polymer with a saturated structure, and chlorine is randomly distributed, which does not cause a chain dechlorination reaction when heated, which is why CPE has better thermal stability than PVC. Generally, CPE with less chlorine content has better heat resistance than CPE with more chlorine content. When used as a special synthetic rubber, the vulcanization system with organic peroxides has better performance than other vulcanization systems; epoxy resin is very beneficial as a heat stabilizer, while amine and phenolic antioxidants have little effect.
2. Ozone resistance and weathering resistance CPE vulcanizate has good ozone resistance and weathering resistance, and can withstand the harsh conditions of ozone concentration of 400 × 10-6. Almost no cracking occurs after ozone aging.
3. Oil and solvent resistance The solubility parameter of CPE is between 9.2 and 9.3. It has good resistance to aliphatic hydrocarbons, ethanol and ketones, and is severely swollen in aromatic and chlorinated hydrocarbons. This kind of solvent is a good solvent for CPE, and the appropriate variety can be selected to make the mortar. CPE has certain oil resistance. It is soaked in various typical oils, such as fuel oil, hydraulic oil, and engine oil at different temperatures, and its performance changes very little.
4. Electrical properties CPE has polarity and can only be used as a low-voltage insulating material. However, due to its good ozone resistance, heat aging resistance, wear resistance and flame retardant properties, it is often used as a cable sheath material. With the increase of chlorine content, the dielectric constant increases and decreases after reaching a peak; the higher the frequency, the smaller the chlorine content at the peak.
5. Flame retardant CPE does not flame retardant. Under the action of the flame, it will be covered by a layer of ash that can prevent the flame from spreading. When the chlorine content increases from 35% to 63%, the amount of this charring ash will increase sharply. Compared with other chlorine-containing flame retardants, CPE is easily mixed with many rubbers and plastics, and has good durability, so it is considered an economical industrial flame retardant polymer. With the increase of chlorine content, the oxygen index of CPE increases accordingly.

Chlorinated polyethylene (CPE) is the product of chlorination of polyethylene. Light or a free radical initiator is used as a catalyst to make the chlorination reaction proceed continuously. After the chlorination requirements are met, the chlorination is stopped and the reaction is terminated. The chlorination reaction can use iodine, aluminum chloride, ferric chloride, and organic peroxides as catalysts. The reaction is slow in the dark, and a small amount of oxygen plays a catalytic role while a large amount of oxygen inhibits it. At present, the methods commonly used in the industrial production of CPE include solution method, gas phase method and aqueous phase suspension method.   

1. In the solution method, polyethylene and chlorinated hydrocarbons are added to a glass-lined reactor with a stirrer, nitrogen is filled to remove air, and heating is made into a solution of 5% to 10%. After the chlorination reaction at a certain temperature and under reflux, the precipitant is poured into the precipitant to recover the solvent, and the chlorinated polyethylene is separated. The finished product is obtained after washing and drying. The initiators commonly used in the solution method are ultraviolet rays, phenyl peroxide, azobisisobutyronitrile, ferric chloride, aluminum trichloride, iodine, etc. In addition to carbon tetrachloride and trichloromethane, solvents are also used for chlorinated hydrocarbons such as trichloroethane, tetrachloroethane, and chlorobenzene. The raw material generally uses high-pressure polyethylene, but low-pressure polyeth This method has the longest history in the production of chlorinated polyethylene, with low requirements for the particle size of the raw material polyethylene, simple process control conditions, uniform distribution of chlorine in the resulting product, and easy to obtain amorphous rubber elastomers. However, material separation and solvent recovery require more equipment, and drying equipment is also more complex and costly. The harm of solvents to the human body is not easy to protect, and the residual solvent in the finished product is difficult to completely remove. When mixed, there is an odor, yellow color, and white products are not easy to produce.
2. Gas phase method, there are fixed bed method and fluidized bed method, and the fluidized bed method is mainly used at present. Generally, the fine powder polyethylene (particle size 5-20 um) in suspension is irradiated with ultraviolet rays or sub-rays, and the chlorination reaction is carried out with azobisisobutyronitrile as an initiator. In order to speed up the reaction process, the temperature can be increased. In order to prevent agglomeration and coking to maintain the free-flowing state of polyethylene powder during chlorination, the polyethylene is filled with water-soluble inorganic powder that will not be chlorinated, or the inorganic powder that can be washed away by acid. After the reaction is completed, the additives are washed off, and the product is dried. Chlorination with a fluidized bed requires strict process and safety technology. Since the fluidized bed method can be continuously chlorinated, the capacity is large, but chlorination near the melting point of polyethylene can easily cause material bonding and coking, and the recovery of unreacted chlorine and hydrogen chloride is more difficult. It is still being studied and improved. Fewer companies use this method to produce.
3. Aqueous suspension method, after the emergence of high-density polyethylene, this method has become the main production method of chlorinated polyethylene at present. The content of polyethylene in the suspension is 5% to 20%, it can be suspended in water, hydrogen chloride aqueous solution, etc. The reaction solution also adds surfactants and quaternary ammonium salts to prevent the accumulation of static charges. The initiator used is basically the same as when it is manufactured by the solution method. The disadvantage is that the equipment is required to have good corrosion resistance, the raw materials need to be pulverized, and the chlorination uniformity of the product is not as good as that of chlorinated polyethylene obtained by the solution method.
4. Block chlorinated polyethylene (solution and water suspension combined) can be obtained according to the temperature at the time of chlorination (above or below the melting point of PE), and different configurations of block CPE can be obtained to produce different grades of products.

Chlorinated polyethylene is modified with a small amount of PVC, HDPE, and MBS. It can be extruded to make various resistant YouTube, acid-resistant pipes, waterproof coils, profiles, films, and shrink films. It can also be used to make various molded products, flooring, construction sealants, cover plates, wire and cable coatings, and various filling material products. Chlorinated polyethylene is used as a modifier for PVC, PE, and rubber, which can greatly improve the performance of these products. Chlorinated polyethylene modifies rigid PVC, which can make a wide range of soft, semi-soft, and rigid plastics. As a toughening modifier for PVC, it can improve its elasticity, toughness and low temperature properties. The embrittlement temperature can be reduced to -40 ° C, and the weather resistance, heat resistance and chemical stability are far superior to other rubber modifiers, so it can be widely used as a building material. As a modifier for polyethylene, it can improve its printability, flame retardancy and flexibility. After adding 5% CPE to HDPE, the adhesive force with ink can be increased by 3 times; after adding a small amount of CPE, Sb203 and white oil to the mining PE hose formula, the flame retardancy can be improved, and there is no melt flow during combustion; the density of PE foam modified with CPE increases, and CPE can also be used as a solubilizer for blending modification with ABS, PS, PP, PVC and rubber. Chlorinated polyethylene, like hot plastic, can be applied to the surfaces of metal products, textiles, paper, glass, and wood by gas flame spraying.

1. Cable sheathing, rubber sheathing began to use neoprene rubber, chlorosulfonated polyethylene was used in the 1950s, and CPE was not introduced until the late 1960s. These rubber materials can meet the design and performance requirements of the cable and are applied.
2. Heat-resistant conveyor belt CPE is used to manufacture heat-resistant conveyor belts that can withstand polar swelling materials, such as tar and asphalt.
3. Industrial hose, due to the ozone resistance, weathering resistance, and flame resistance of CPE, which are inherent characteristics of polymers, is much better than the usual use of extractive compounding agents to improve these properties. At the same time, it also has good extrusion performance, so it is suitable for the internal and external adhesives of hose.
4. Other CPE can also be used as the outer rubber layer of rubber rollers, used in steel or textile industry pressure rollers or photocopiers conveying rubber rollers. Used as model rubber products; used in combination with styrene-butadiene rubber, EPDM rubber, etc., it has good extrusion performance and weathering resistance and other properties, low cost, and can be used as extrusion products such as window inserts in the automotive and construction industries. Combined with other rubbers, closed-cell sponge rubber with smooth surface and good aging resistance can be obtained. CPE adds a large amount of filler still has sufficient physical and mechanical properties and can be applied without vulcanization. Typical products such as roofing waterproof membranes, magnetic rubber, etc.
5. The application of chlorinated polyethylene as the main material takes chlorinated polyethylene as the main body, and is modified by PVC, HDPE, and MBS. It can be extruded to produce resistant YouTube, acid-resistant pipes, waterproof membranes, profiles, films and shrink films, etc. It can also be coated, injection molded, molded, laminated, welded, bonded and machined. CPE elastomers have achieved good application results in soft PVC products such as waterproof membranes and films, and in insulating wire and cable sheathing materials. China's chlorinated polyethylene is mainly used as a toughening modifier for rigid PVC, which can improve the elasticity, toughness and low temperature properties of rigid PVC. The embrittlement temperature of CPE-modified PVC can be reduced to -40 ° C, while heat resistance, weather resistance and chemical stability are far superior to other rubber modifiers, so it is widely used in building materials and other fields.
6. The application of chlorinated polyethylene modified PE, the addition of CPE to polyethylene can improve its printability, flame retardancy and flexibility. After adding CPE and white oil to the mining PE hose formula, the flame retardancy is improved, and there is no melt flow during combustion, and the density of PE foam modified with CPE is increased.
7. Application of Chlorinated Polyethylene as Compatibilizer CPE is a two-component blend system, used for blending modification with ABS, PS, PP, PE, PVC, rubber, etc. For example, in PVC/PE blending system, it can significantly improve toughness, impact strength and promote plasticization. The injection molded products of blends can be used as mechanical parts, and 1/3 of their products are used for laminating and coating of thin sheets.

The outer layer of the product packaging is a polypropylene woven bag lined with a polyethylene film bag, with a net weight of 25kg per bag. During storage and transportation, the warehouse or compartment should be kept dry, tidy and well ventilated. No iron hooks should be used during loading and unloading.

Since chlorinated polyethylene contains a large number of chlorine atoms, it must be synthesized with additives such as heat stabilizers, pigments, fillers and lubricants to protect its composition and produce the required properties. For example, heat stabilizers must be added to thermoplastic CPE compositions to avoid the formation of HC1 by heat. These heat stabilizers must be acidic receptors, such as epoxy soybean oil, cyclic fatty epoxy compounds, magnesium oxide and carbonate, etc. When using a hot melt process, antioxidants should be added to improve performance, and hindered phenols are used to ensure the color stability of the resin at high temperatures. Hindered amines are used as light stabilizers to protect the light stability of the resin. Chlorinated polyethylene can be molded by general injection molding and extrusion methods. After blending with PVC, it can be extruded into pipes, plates, wire coatings, profiles, films, and shrink films by general PVC processing equipment; it can also be coated, compression molded, laminated, compounded, machined, welded, and bonded.

1. CPE can be used as plastic extrusion or injection molding by general processing equipment. During processing, CPE generally requires less plasticizer than PVC, and if the content of plasticizer is too high, it may cause surface stickiness. CPE can also be compatible with low-polar plasticizers, such as chlorinated paraffin long-chain carbonates and polymer plasticizers. The pigments used in CPE are generally carbon black and titanium dioxide, and CPE is also compatible with these raw materials; pigments containing small amounts of zinc and iron will reduce the thermal stability of CPE products. Cross-linked CPE is used as a thermosetting resin. Generally, peroxide is used as a curing agent in industry, but the peroxide curing agent and antioxidant selected must match. If dimercaptodiazepine is used as a curing agent, it is less sensitive to antioxidants, but it does not allow the use of chlorinated paraffins and epoxy compounds as additives. CPE - generally fine, soft particles, it is easy to absorb moisture, so anti-bonding agents are generally added. Some CPE is large or block, especially hardened, thermosetting elastic CPE, which needs to be cut into strips or granules for mixing, and then injection molded or molded.
2. The Mooney viscosity used as rubber CPE is larger than that of general-purpose rubber, but mixing, extrusion, calendering and other processes can be carried out using the equipment and process methods commonly used in the rubber industry. (1) Rubber mixing, because chlorinated polyethylene does not have double bonds on the molecular chain, it has stability under the action of mechanical shear force, so it will not cause molecular chain break during the mixing process of the open mixer. It is a kind of rubber without plasticizing effect. Although chlorinated polyethylene has no plasticizing effect, it is mixed for 3 to 5 minutes before mixing to help the mixing of fillers, plasticizers and other compounding agents. CPE is also very convenient to mix in the mixer. Reverse mixing method is often used, that is, dry compounding agents are added to the mixer first, then liquid additives are added, and finally raw rubber is added. When the temperature reaches 88~ 100 ° C, organic peroxides are added, and the rubber can be discharged at 105~ 121 ° C according to the different scorch time and vulcanization speed. (2) CPE can be extruded by a general-purpose rubber extruder, which can obtain smooth and dense products with good extrusion speed. CPE can be heated and then extruded by an extruder, or it can be directly extruded by a cold feed extruder. Since CPE has good air permeability, it is easy to generate bubbles due to air intake. Therefore, when using an extruder without a vacuum device, the temperature should be kept lower to prevent the rubber from being too soft and unable to discharge the air inside. When extruding thermoplastic CPE, a higher extrusion temperature can be used, but it should be noted that if the temperature exceeds 90 ° C, the CPE will accelerate the dehydrochlorination, so the temperature of the extrusion must be controlled below this temperature.
3. The calendering and rubbing CPE has good calendering processing performance, but when the formula contains fillers such as soft clay, there may be a sticky roll phenomenon. The use of low-viscosity CPE varieties, or the combination of some low-viscosity CPE made of rubber is suitable for fabric lacquer.
4. In the manufacture and gluing of the glue, a specific CPE glue is used, and various good solvents can be used to make the glue for gluing. The commonly used solvents are dichloromethane, toluene, etc. Before making the glue, the CPE glue is best preheated with an open mill, then shredded, and then mixed in a glue mixer, so that it is easier to obtain the ideal glue. The resulting glue can be glued according to the glue coating process commonly used in the rubber industry.
5. In molding vulcanization, a release agent is required to keep the mold clean and easy to start the mold during molding vulcanization, and a neutral soap solution can also be used as a release agent. The use of ester plasticizers or a small amount of alkane petroleum-based plasticizers in the formulation of the rubber also helps to release the mold. When molding vulcanized chlorinated polyethylene rubber, like other halogen rubbers, the mold is often corroded due to residual hydrogen chloride. Therefore, the mold used in production should be plated with hard chrome.

63231-66-3 - nature

Trusted Data

High density polyethylene is a crystalline polymer. As the hydrogen atom on the molecular chain is replaced by chlorine, its crystallinity decreases, softens, and the glass transition temperature decreases. However, when the chlorine content in chlorinated polyethylene exceeds a certain value, the glass transition temperature increases. Therefore, the glass transition temperature and melting point of chlorinated polyethylene can be higher or lower than that of the original polyethylene. The molecular structure of chlorinated polyethylene contains a copolymer of ethylene-vinyl chloride-1,2-12-vinyl chloride. The chlorine content of ordinary chlorinated polyethylene is 25% to 45% (mass). Depending on the molecular weight, chlorine content, molecular structure and chlorination process of the resin, it can exhibit different properties from rigid plastics to elastomers. Chlorinated polyethylene has excellent weather resistance, cold resistance, impact resistance, chemical resistance, oil resistance and electrical properties, etc. At the same time, it has the dual properties of plastic and rubber, and has good compatibility with other plastics and fillers. Therefore, it can be filled with a large number of fillers, for example, 100 parts of resin can be filled with 400 parts of titanium dioxide or 300 parts of saponin (or carbon black). Chlorinated polyethylene with a chlorine content of more than 25% also has self-extinguishing properties. It can also be crosslinked with organic peroxides to obtain vulcanized polymers.

1. Heat aging resistance CPE is a polymer with a saturated structure, and chlorine is randomly distributed, which does not cause a chain dechlorination reaction when heated, which is why CPE has better thermal stability than PVC. Generally, CPE with less chlorine content has better heat resistance than CPE with more chlorine content. When used as a special synthetic rubber, the vulcanization system with organic peroxides has better performance than other vulcanization systems; epoxy resin is very beneficial as a heat stabilizer, while amine and phenolic antioxidants have little effect.
2. Ozone resistance and weathering resistance CPE vulcanizate has good ozone resistance and weathering resistance, and can withstand the harsh conditions of ozone concentration of 400 × 10-6. Almost no cracking occurs after ozone aging.
3. Oil and solvent resistance The solubility parameter of CPE is between 9.2 and 9.3. It has good resistance to aliphatic hydrocarbons, ethanol and ketones, and is severely swollen in aromatic and chlorinated hydrocarbons. This kind of solvent is a good solvent for CPE, and the appropriate variety can be selected to make the mortar. CPE has certain oil resistance. It is soaked in various typical oils, such as fuel oil, hydraulic oil, and engine oil at different temperatures, and its performance changes very little.
4. Electrical properties CPE has polarity and can only be used as a low-voltage insulating material. However, due to its good ozone resistance, heat aging resistance, wear resistance and flame retardant properties, it is often used as a cable sheath material. With the increase of chlorine content, the dielectric constant increases and decreases after reaching a peak; the higher the frequency, the smaller the chlorine content at the peak.
5. Flame retardant CPE does not flame retardant. Under the action of the flame, it will be covered by a layer of ash that can prevent the flame from spreading. When the chlorine content increases from 35% to 63%, the amount of this charring ash will increase sharply. Compared with other chlorine-containing flame retardants, CPE is easily mixed with many rubbers and plastics, and has good durability, so it is considered an economical industrial flame retardant polymer. With the increase of chlorine content, the oxygen index of CPE increases accordingly.

63231-66-3 - Method

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Chlorinated polyethylene (CPE) is the product of chlorination of polyethylene. Light or a free radical initiator is used as a catalyst to make the chlorination reaction proceed continuously. After the chlorination requirements are met, the chlorination is stopped and the reaction is terminated. The chlorination reaction can use iodine, aluminum chloride, ferric chloride, and organic peroxides as catalysts. The reaction is slow in the dark, and a small amount of oxygen plays a catalytic role while a large amount of oxygen inhibits it. At present, the methods commonly used in the industrial production of CPE include solution method, gas phase method and aqueous phase suspension method.   

1. In the solution method, polyethylene and chlorinated hydrocarbons are added to a glass-lined reactor with a stirrer, nitrogen is filled to remove air, and heating is made into a solution of 5% to 10%. After the chlorination reaction at a certain temperature and under reflux, the precipitant is poured into the precipitant to recover the solvent, and the chlorinated polyethylene is separated. The finished product is obtained after washing and drying. The initiators commonly used in the solution method are ultraviolet rays, phenyl peroxide, azobisisobutyronitrile, ferric chloride, aluminum trichloride, iodine, etc. In addition to carbon tetrachloride and trichloromethane, solvents are also used for chlorinated hydrocarbons such as trichloroethane, tetrachloroethane, and chlorobenzene. The raw material generally uses high-pressure polyethylene, but low-pressure polyeth This method has the longest history in the production of chlorinated polyethylene, with low requirements for the particle size of the raw material polyethylene, simple process control conditions, uniform distribution of chlorine in the resulting product, and easy to obtain amorphous rubber elastomers. However, material separation and solvent recovery require more equipment, and drying equipment is also more complex and costly. The harm of solvents to the human body is not easy to protect, and the residual solvent in the finished product is difficult to completely remove. When mixed, there is an odor, yellow color, and white products are not easy to produce.
2. Gas phase method, there are fixed bed method and fluidized bed method, and the fluidized bed method is mainly used at present. Generally, the fine powder polyethylene (particle size 5-20 um) in suspension is irradiated with ultraviolet rays or sub-rays, and the chlorination reaction is carried out with azobisisobutyronitrile as an initiator. In order to speed up the reaction process, the temperature can be increased. In order to prevent agglomeration and coking to maintain the free-flowing state of polyethylene powder during chlorination, the polyethylene is filled with water-soluble inorganic powder that will not be chlorinated, or the inorganic powder that can be washed away by acid. After the reaction is completed, the additives are washed off, and the product is dried. Chlorination with a fluidized bed requires strict process and safety technology. Since the fluidized bed method can be continuously chlorinated, the capacity is large, but chlorination near the melting point of polyethylene can easily cause material bonding and coking, and the recovery of unreacted chlorine and hydrogen chloride is more difficult. It is still being studied and improved. Fewer companies use this method to produce.
3. Aqueous suspension method, after the emergence of high-density polyethylene, this method has become the main production method of chlorinated polyethylene at present. The content of polyethylene in the suspension is 5% to 20%, it can be suspended in water, hydrogen chloride aqueous solution, etc. The reaction solution also adds surfactants and quaternary ammonium salts to prevent the accumulation of static charges. The initiator used is basically the same as when it is manufactured by the solution method. The disadvantage is that the equipment is required to have good corrosion resistance, the raw materials need to be pulverized, and the chlorination uniformity of the product is not as good as that of chlorinated polyethylene obtained by the solution method.
4. Block chlorinated polyethylene (solution and water suspension combined) can be obtained according to the temperature at the time of chlorination (above or below the melting point of PE), and different configurations of block CPE can be obtained to produce different grades of products.

63231-66-3 - purpose

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Chlorinated polyethylene is modified with a small amount of PVC, HDPE, and MBS. It can be extruded to make various resistant YouTube, acid-resistant pipes, waterproof coils, profiles, films, and shrink films. It can also be used to make various molded products, flooring, construction sealants, cover plates, wire and cable coatings, and various filling material products. Chlorinated polyethylene is used as a modifier for PVC, PE, and rubber, which can greatly improve the performance of these products. Chlorinated polyethylene modifies rigid PVC, which can make a wide range of soft, semi-soft, and rigid plastics. As a toughening modifier for PVC, it can improve its elasticity, toughness and low temperature properties. The embrittlement temperature can be reduced to -40 ° C, and the weather resistance, heat resistance and chemical stability are far superior to other rubber modifiers, so it can be widely used as a building material. As a modifier for polyethylene, it can improve its printability, flame retardancy and flexibility. After adding 5% CPE to HDPE, the adhesive force with ink can be increased by 3 times; after adding a small amount of CPE, Sb203 and white oil to the mining PE hose formula, the flame retardancy can be improved, and there is no melt flow during combustion; the density of PE foam modified with CPE increases, and CPE can also be used as a solubilizer for blending modification with ABS, PS, PP, PVC and rubber. Chlorinated polyethylene, like hot plastic, can be applied to the surfaces of metal products, textiles, paper, glass, and wood by gas flame spraying.

1. Cable sheathing, rubber sheathing began to use neoprene rubber, chlorosulfonated polyethylene was used in the 1950s, and CPE was not introduced until the late 1960s. These rubber materials can meet the design and performance requirements of the cable and are applied.
2. Heat-resistant conveyor belt CPE is used to manufacture heat-resistant conveyor belts that can withstand polar swelling materials, such as tar and asphalt.
3. Industrial hose, due to the ozone resistance, weathering resistance, and flame resistance of CPE, which are inherent characteristics of polymers, is much better than the usual use of extractive compounding agents to improve these properties. At the same time, it also has good extrusion performance, so it is suitable for the internal and external adhesives of hose.
4. Other CPE can also be used as the outer rubber layer of rubber rollers, used in steel or textile industry pressure rollers or photocopiers conveying rubber rollers. Used as model rubber products; used in combination with styrene-butadiene rubber, EPDM rubber, etc., it has good extrusion performance and weathering resistance and other properties, low cost, and can be used as extrusion products such as window inserts in the automotive and construction industries. Combined with other rubbers, closed-cell sponge rubber with smooth surface and good aging resistance can be obtained. CPE adds a large amount of filler still has sufficient physical and mechanical properties and can be applied without vulcanization. Typical products such as roofing waterproof membranes, magnetic rubber, etc.
5. The application of chlorinated polyethylene as the main material takes chlorinated polyethylene as the main body, and is modified by PVC, HDPE, and MBS. It can be extruded to produce resistant YouTube, acid-resistant pipes, waterproof membranes, profiles, films and shrink films, etc. It can also be coated, injection molded, molded, laminated, welded, bonded and machined. CPE elastomers have achieved good application results in soft PVC products such as waterproof membranes and films, and in insulating wire and cable sheathing materials. China's chlorinated polyethylene is mainly used as a toughening modifier for rigid PVC, which can improve the elasticity, toughness and low temperature properties of rigid PVC. The embrittlement temperature of CPE-modified PVC can be reduced to -40 ° C, while heat resistance, weather resistance and chemical stability are far superior to other rubber modifiers, so it is widely used in building materials and other fields.
6. The application of chlorinated polyethylene modified PE, the addition of CPE to polyethylene can improve its printability, flame retardancy and flexibility. After adding CPE and white oil to the mining PE hose formula, the flame retardancy is improved, and there is no melt flow during combustion, and the density of PE foam modified with CPE is increased.
7. Application of Chlorinated Polyethylene as Compatibilizer CPE is a two-component blend system, used for blending modification with ABS, PS, PP, PE, PVC, rubber, etc. For example, in PVC/PE blending system, it can significantly improve toughness, impact strength and promote plasticization. The injection molded products of blends can be used as mechanical parts, and 1/3 of their products are used for laminating and coating of thin sheets.

63231-66-3 - security

Trusted Data

The outer layer of the product packaging is a polypropylene woven bag lined with a polyethylene film bag, with a net weight of 25kg per bag. During storage and transportation, the warehouse or compartment should be kept dry, tidy and well ventilated. No iron hooks should be used during loading and unloading.

63231-66-3 - Forming

Trusted Data

Since chlorinated polyethylene contains a large number of chlorine atoms, it must be synthesized with additives such as heat stabilizers, pigments, fillers and lubricants to protect its composition and produce the required properties. For example, heat stabilizers must be added to thermoplastic CPE compositions to avoid the formation of HC1 by heat. These heat stabilizers must be acidic receptors, such as epoxy soybean oil, cyclic fatty epoxy compounds, magnesium oxide and carbonate, etc. When using a hot melt process, antioxidants should be added to improve performance, and hindered phenols are used to ensure the color stability of the resin at high temperatures. Hindered amines are used as light stabilizers to protect the light stability of the resin. Chlorinated polyethylene can be molded by general injection molding and extrusion methods. After blending with PVC, it can be extruded into pipes, plates, wire coatings, profiles, films, and shrink films by general PVC processing equipment; it can also be coated, compression molded, laminated, compounded, machined, welded, and bonded.

1. CPE can be used as plastic extrusion or injection molding by general processing equipment. During processing, CPE generally requires less plasticizer than PVC, and if the content of plasticizer is too high, it may cause surface stickiness. CPE can also be compatible with low-polar plasticizers, such as chlorinated paraffin long-chain carbonates and polymer plasticizers. The pigments used in CPE are generally carbon black and titanium dioxide, and CPE is also compatible with these raw materials; pigments containing small amounts of zinc and iron will reduce the thermal stability of CPE products. Cross-linked CPE is used as a thermosetting resin. Generally, peroxide is used as a curing agent in industry, but the peroxide curing agent and antioxidant selected must match. If dimercaptodiazepine is used as a curing agent, it is less sensitive to antioxidants, but it does not allow the use of chlorinated paraffins and epoxy compounds as additives. CPE - generally fine, soft particles, it is easy to absorb moisture, so anti-bonding agents are generally added. Some CPE is large or block, especially hardened, thermosetting elastic CPE, which needs to be cut into strips or granules for mixing, and then injection molded or molded.
2. The Mooney viscosity used as rubber CPE is larger than that of general-purpose rubber, but mixing, extrusion, calendering and other processes can be carried out using the equipment and process methods commonly used in the rubber industry. (1) Rubber mixing, because chlorinated polyethylene does not have double bonds on the molecular chain, it has stability under the action of mechanical shear force, so it will not cause molecular chain break during the mixing process of the open mixer. It is a kind of rubber without plasticizing effect. Although chlorinated polyethylene has no plasticizing effect, it is mixed for 3 to 5 minutes before mixing to help the mixing of fillers, plasticizers and other compounding agents. CPE is also very convenient to mix in the mixer. Reverse mixing method is often used, that is, dry compounding agents are added to the mixer first, then liquid additives are added, and finally raw rubber is added. When the temperature reaches 88~ 100 ° C, organic peroxides are added, and the rubber can be discharged at 105~ 121 ° C according to the different scorch time and vulcanization speed. (2) CPE can be extruded by a general-purpose rubber extruder, which can obtain smooth and dense products with good extrusion speed. CPE can be heated and then extruded by an extruder, or it can be directly extruded by a cold feed extruder. Since CPE has good air permeability, it is easy to generate bubbles due to air intake. Therefore, when using an extruder without a vacuum device, the temperature should be kept lower to prevent the rubber from being too soft and unable to discharge the air inside. When extruding thermoplastic CPE, a higher extrusion temperature can be used, but it should be noted that if the temperature exceeds 90 ° C, the CPE will accelerate the dehydrochlorination, so the temperature of the extrusion must be controlled below this temperature.
3. The calendering and rubbing CPE has good calendering processing performance, but when the formula contains fillers such as soft clay, there may be a sticky roll phenomenon. The use of low-viscosity CPE varieties, or the combination of some low-viscosity CPE made of rubber is suitable for fabric lacquer.
4. In the manufacture and gluing of the glue, a specific CPE glue is used, and various good solvents can be used to make the glue for gluing. The commonly used solvents are dichloromethane, toluene, etc. Before making the glue, the CPE glue is best preheated with an open mill, then shredded, and then mixed in a glue mixer, so that it is easier to obtain the ideal glue. The resulting glue can be glued according to the glue coating process commonly used in the rubber industry.
5. In molding vulcanization, a release agent is required to keep the mold clean and easy to start the mold during molding vulcanization, and a neutral soap solution can also be used as a release agent. The use of ester plasticizers or a small amount of alkane petroleum-based plasticizers in the formulation of the rubber also helps to release the mold. When molding vulcanized chlorinated polyethylene rubber, like other halogen rubbers, the mold is often corroded due to residual hydrogen chloride. Therefore, the mold used in production should be plated with hard chrome.

63231-66-3 - brief introduction