Application of PVC
DATE：2022/8/29 9:46:47 / READ： / SOURCE：This station
Application of PVC
2.3.9.1 performance characteristics
Chlorinated polyvinyl chloride is a white powder resin with a relative density of 1.48 ~ 1.58 and a chlorine content of 61% ~ 68%; It has good adhesion, fire resistance, chemical corrosion resistance and electrical insulation; The product does not deform in boiling water, the maximum use temperature can reach 105 ℃, the melting temperature is 110 ℃, and the shrinkage rate (3 ~ 7) x10-3cm / cm; Rockwell hardness r117 ~ 122; With the increase of chlorine content, the tensile strength and bending strength of the products increased, but the brittleness increased; Generally, the tensile breaking strength of chlorinated polyvinyl chloride products is 52-62mpa, the elongation at break is 4% - 65%, the compressive strength is 62-152mpa, the bending strength is 100-117mpa, the tensile modulus is 2482-3280mpa, the impact strength of cantilever beam is 53-298j / m, and the linear expansion coefficient (68-76) x10-6 ℃ - 1; Chlorinated polyvinyl chloride is easily soluble in various organic solvents such as esters, ketones and aromatic hydrocarbons.
2.3.9.2 forming method and Application
Chlorinated polyvinyl chloride resin molding products are mainly chlorinated polyvinyl chloride by suspension method. Ordinary PVC molding method can be used for processing, but the plasticizing temperature of raw materials in the molding process is higher. Extrusion and injection molding processes can be used to form pipes, plates, films, wires and cables, injection molded pipe fittings, electrical switches and other products. 23.93 key points of forming process
① The raw materials are easy to absorb moisture. Before processing, the resin should be dried in an 80 ℃ oven for 2 ~ 4H.
② Chlorinated polyvinyl chloride is easier to plasticize than polyvinyl chloride, but the thermal stability time of molten material is shorter than that of PVC material; The higher the chlorine content in the domestic CPVC resin, the easier the melt fracture occurs during processing.
③ The resin is easy to decompose in the molding process and has great corrosion to the equipment and molding mold. It is required that the contact surface between the equipment and the molten material should be provided with anti-corrosion chromium layer.
It shall have high machining accuracy, smooth surface and small resistance. In the process of large material content, the material flows through the equipment
⑤ Oil medium shall be used for cooling and temperature control during operation to ensure that the working source of the screw is always fixed@ Oil or water should be used as heat conducting medium for temperature control of the barrel to control the temperature of the barrel
The temperature fluctuation shall not be greater than 5 ℃. Dinner baking resin is used to make coatings, varnishes and adhesives. Suspension chlorinated polyvinyl chloride resin and lotion method shall be used for molding plastic products
When forming pipes, the core rod in the forming mold shall be equipped with heating rod and energy
Warm cooling device.
CPVC is not a dangerous product like PVC resin.
At present, the domestic chlorinated polyvinyl chloride resin production units include Beijing No.2 Chemical Co., Ltd., Shanghai Electric Chemical Co., Ltd., Yibin Tianyuan Chemical Plant and Huludao Chemical Group Co., Ltd
Secretary, etc.
23.10 polyvinylidene chloride
Polyvinylidene chloride is a homopolymer of vinylidene chloride, abbreviated as PVDC. Vinylidene chloride (VDC) is a homopolymer. Due to its high softening point temperature and close to its decomposition temperature, and its poor compatibility with general plasticizers, it is difficult for polyvinylidene chloride (VDC) to form plastic products by heating and melting, so this resin has little practical value. At present, polyvinylidene chloride used in molding products is a copolymer of vinylidene chloride (accounting for more than 85%) and ethylene oxide or other monomers [such as vinyl acetate (VAC), propylene (an), methacrylate, etc.). After copolymerization of vinylidene chloride and monomer, it plays an intramolecular plasticizing role, appropriately reduces its softening point temperature and improves its compatibility with plasticizer. However, the original high crystallinity of PVDC resin has not changed much. The result of copolymerization is that the polymerization is biased
Still larger than PVC.
It is possible to heat and melt vinyl chloride resin to form products, but it is difficult to form and process
2.3.11 ethylene vinylidene chloride (VC) - vinylidene chloride (VDC) copolymer is polyvinylidene chloride
(PVDC) is one of the most widely used resins. This product has two forms: dried powdered resin and original water latex
23111 vinylidene vinylidene
Compared with printed film products, vinyl chloride has lower transmittance to liquid and gas, higher thermal shrinkage, and higher firmness and impact strength than polyvinyl chloride film; The products are flame-retardant and free from bacteria and insects; It is easy to decompose hydrogen chloride and other gases under the action of heat, ultraviolet rays, particle radiation rays, rays), alkaline reagents, and some gold surrounding salts; The product is resistant to a variety of solvents and chemical reagents. It is easy to swell in containing and chlorinating, and easy to swell in concentrated sulfuric acid and nitric acid
Vinyl chloride decomposes.
Vinyl chloride - vinylidene chloride copolymer can be produced by extrusion spinning, calendering and extrusion blow molding.
2.311.2 key points of vinyl chloride vinylidene chloride copolymer forming process
① When vc-vdc copolymer is used to form film or fiber, the resin produced by suspension method with the content of vinylidene chloride of 80% ~ 95% shall be selected; The copolymer used for coating and adhesive shall be produced by lotion method, and the content of vinylidene chloride shall not be greater than 70%.
② Due to the large crystallization tendency of vc-vdc copolymer, water cooling (10 ° C) shall be carried out quickly after extrusion molding or wire drawing, and then enter the preheating bath. In this kind of work
And original water latex
23111 vinylidene vinylidene
Compared with printed film products, vinyl chloride has lower transmittance to liquid and gas, higher thermal shrinkage, and higher firmness and impact strength than polyvinyl chloride film; The products are flame-retardant and free from bacteria and insects; It is easy to decompose hydrogen chloride and other gases under the action of heat, ultraviolet rays, particle radiation rays, rays), alkaline reagents, and some gold surrounding salts; The product is resistant to a variety of solvents and chemical reagents. It is easy to swell in containing and chlorinating, and easy to swell in concentrated sulfuric acid and nitric acid
Vinyl chloride decomposes.
Vinyl chloride - vinylidene chloride copolymer can be produced by extrusion spinning, calendering and extrusion blow molding.
2.311.2 key points of vinyl chloride vinylidene chloride copolymer forming process
① When vc-vdc copolymer is used to form film or fiber, the resin produced by suspension method with the content of vinylidene chloride of 80% ~ 95% shall be selected; The copolymer used for coating and adhesive shall be produced by lotion method, and the content of vinylidene chloride shall not be greater than 70%.
② Due to the large crystallization tendency of vc-vdc copolymer, water cooling (10 ° C) shall be carried out quickly after extrusion molding or wire drawing, and then enter the preheating bath. In this kind of work
Chapter 1 original section
Responsibility: 2-82 aviation B baking - cool acid B delivery co transport property batch
Special material for base, special material for oil union, special material for leather processing net, special material for magnetic card
Lg-13 / 53 1c13 / 60 material lc13 / 78 LC 11 / 78
23.12.2 forming method and Application
Vinyl chloride copolymer can be processed into plastic products by extrusion, injection molding, calendering and blow molding, just like other thermoplastics. It is suitable for hard products with large proportion of filler in raw materials such as asbestos board, floor and hard compact disc.
The process characteristics of vinyl chloride vinyl acetate copolymer molding products are as follows: the soft products can be molded with this resin, and the products can be produced by adding less plasticizing dose to the raw materials or using chlorinated paraffins as auxiliary plasticizers with low plasticizing efficiency. In the production process, as long as the raw materials are measured separately according to the formula requirements, and then mixed evenly, the raw materials can be mixed into pieces on the open mill. Compared with the homopolymer of vinyl chloride with the same molecular weight, the product molded with vinyl chloride vinyl acetate copolymer has lower processing temperature, faster plasticization and shorter production cycle. price
The production units of vinyl chloride vinyl acetate copolymer include Shanghai Tianyuan Group Tianyuan Chemical Co., Ltd., Beijing Huaer Co., Ltd., Tianjin chemical plant, Hangzhou Electrochemical Group Co., Ltd., Jiangsu North chlor alkali Group Co., Ltd. and Nantong Jiangshan Pesticide Chemical Co., Ltd.
23.13 vinyl chloride ethylene vinyl acetate copolymer
Vinyl chloride ethylene vinyl acetate copolymer is a new type of internally plasticized polyvinyl chloride. It has several names: vinyl chloride vinyl acetate copolymer, vinyl chloride grafted vinyl acetate, ethylene vinyl acetate and vinyl chloride grafted copolymer. Abbreviation: VC
Chapter 1 original section
Responsibility: 2-82 aviation B baking - cool acid B delivery co transport property batch
Special material for base, special material for oil union, special material for leather processing net, special material for magnetic card
Lg-13 / 53 1c13 / 60 material lc13 / 78 LC 11 / 78
Qualified products (April - 58): qualified products (55-6575-81), qualified products (73-8a15 ~ 81), qualified products (73-83)
23.12.2 forming method and Application
Vinyl chloride copolymer can be processed into plastic products by extrusion, injection molding, calendering and blow molding, just like other thermoplastics. It is suitable for hard products with large proportion of filler in raw materials such as asbestos board, floor and hard compact disc.
The process characteristics of vinyl chloride vinyl acetate copolymer molding products are as follows: the soft products can be molded with this resin, and the products can be produced by adding less plasticizing dose to the raw materials or using chlorinated paraffins as auxiliary plasticizers with low plasticizing efficiency. In the production process, as long as the raw materials are measured separately according to the formula requirements, and then mixed evenly, the raw materials can be mixed into pieces on the open mill. Compared with the homopolymer of vinyl chloride with the same molecular weight, the product molded with vinyl chloride vinyl acetate copolymer has lower processing temperature, faster plasticization and shorter production cycle. price
The production units of vinyl chloride vinyl acetate copolymer include Shanghai Tianyuan Group Tianyuan Chemical Co., Ltd., Beijing Huaer Co., Ltd., Tianjin chemical plant, Hangzhou Electrochemical Group Co., Ltd., Jiangsu North chlor alkali Group Co., Ltd. and Nantong Jiangshan Pesticide Chemical Co., Ltd.
23.13 vinyl chloride ethylene vinyl acetate copolymer
Vinyl chloride ethylene vinyl acetate copolymer is a new type of internally plasticized polyvinyl chloride. It has several names: vinyl chloride vinyl acetate copolymer, vinyl chloride grafted vinyl acetate, ethylene vinyl acetate and vinyl chloride grafted copolymer. Abbreviation: VC
Manual of molding technician
Evavcevaevag PVC. Polyvinyl chloride · ethylene copolymer containing ethylene) grease is 6% ~ according to different uses, VV is one mass impact
Copolymer (EVA) 30% ~ 60% (mass fraction). (mass fraction); The other is soft plasticized polyvinyl chloride containing ethylene ethyl acetate
2.3.13.1 the performance characteristics and processing performance are excellent. In addition, the temperature range of plasticizing and melting is wide. The products molded by vinyl chloride vinyl acetate copolymer in the resin have different content of vinyl acetate copolymer with high impact strength. The raw materials can be processed into hard, semi-hard or soft products without plasticizer. The EVA in the raw materials can be blended with PV in any proportion: the content and properties of EVA in the copolymer, the polymerization degree of PVC components and the connection
Ring. When the content of ethylene vinyl acetate copolymer (EVA) in the copolymer is 50%, the physical properties, weather resistance, process and stability are aerobic
Weight: about 28%, relative molecular weight: about 100000, relative density: 116, ash content
0.1%, moisture < 0.1%, tensile strength 13.3mpa, elongation 325%, embrittlement
- 50 ℃.
2313.2 molding method and Application
The equipment and process conditions of ethylene ethylene vinyl acetate copolymer molded plastic products are completely the same as those of ordinary PVC resin molded plastic products. Extrusion, injection molding and calendering can be used to form hard, semi-hard and body plastic products with high impact strength and good weather resistance. Such as pipes, plates (sheets), profiles, electrical enclosures, machines
Parts, films, various containers, wire and cable covering materials, etc.
Vinyl chloride vinyl acetate copolymer is a kind of resin with good processing performance and high production efficiency. It can also be used as impact modifier in PVC resin. When molding products with this resin, pay attention to the low plasticizing temperature (not higher than 180 ℃)
2.3.9.1 performance characteristics
Chlorinated polyvinyl chloride is a white powder resin with a relative density of 1.48 ~ 1.58 and a chlorine content of 61% ~ 68%; It has good adhesion, fire resistance, chemical corrosion resistance and electrical insulation; The product does not deform in boiling water, the maximum use temperature can reach 105 ℃, the melting temperature is 110 ℃, and the shrinkage rate (3 ~ 7) x10-3cm / cm; Rockwell hardness r117 ~ 122; With the increase of chlorine content, the tensile strength and bending strength of the products increased, but the brittleness increased; Generally, the tensile breaking strength of chlorinated polyvinyl chloride products is 52-62mpa, the elongation at break is 4% - 65%, the compressive strength is 62-152mpa, the bending strength is 100-117mpa, the tensile modulus is 2482-3280mpa, the impact strength of cantilever beam is 53-298j / m, and the linear expansion coefficient (68-76) x10-6 ℃ - 1; Chlorinated polyvinyl chloride is easily soluble in various organic solvents such as esters, ketones and aromatic hydrocarbons.
2.3.9.2 forming method and Application
Chlorinated polyvinyl chloride resin molding products are mainly chlorinated polyvinyl chloride by suspension method. Ordinary PVC molding method can be used for processing, but the plasticizing temperature of raw materials in the molding process is higher. Extrusion and injection molding processes can be used to form pipes, plates, films, wires and cables, injection molded pipe fittings, electrical switches and other products. 23.93 key points of forming process
① The raw materials are easy to absorb moisture. Before processing, the resin should be dried in an 80 ℃ oven for 2 ~ 4H.
② Chlorinated polyvinyl chloride is easier to plasticize than polyvinyl chloride, but the thermal stability time of molten material is shorter than that of PVC material; The higher the chlorine content in the domestic CPVC resin, the easier the melt fracture occurs during processing.
③ The resin is easy to decompose in the molding process and has great corrosion to the equipment and molding mold. It is required that the contact surface between the equipment and the molten material should be provided with anti-corrosion chromium layer.
It shall have high machining accuracy, smooth surface and small resistance. In the process of large material content, the material flows through the equipment
⑤ Oil medium shall be used for cooling and temperature control during operation to ensure that the working source of the screw is always fixed@ Oil or water should be used as heat conducting medium for temperature control of the barrel to control the temperature of the barrel
The temperature fluctuation shall not be greater than 5 ℃. Dinner baking resin is used to make coatings, varnishes and adhesives. Suspension chlorinated polyvinyl chloride resin and lotion method shall be used for molding plastic products
When forming pipes, the core rod in the forming mold shall be equipped with heating rod and energy
Warm cooling device.
CPVC is not a dangerous product like PVC resin.
At present, the domestic chlorinated polyvinyl chloride resin production units include Beijing No.2 Chemical Co., Ltd., Shanghai Electric Chemical Co., Ltd., Yibin Tianyuan Chemical Plant and Huludao Chemical Group Co., Ltd
Secretary, etc.
23.10 polyvinylidene chloride
Polyvinylidene chloride is a homopolymer of vinylidene chloride, abbreviated as PVDC. Vinylidene chloride (VDC) is a homopolymer. Due to its high softening point temperature and close to its decomposition temperature, and its poor compatibility with general plasticizers, it is difficult for polyvinylidene chloride (VDC) to form plastic products by heating and melting, so this resin has little practical value. At present, polyvinylidene chloride used in molding products is a copolymer of vinylidene chloride (accounting for more than 85%) and ethylene oxide or other monomers [such as vinyl acetate (VAC), propylene (an), methacrylate, etc.). After copolymerization of vinylidene chloride and monomer, it plays an intramolecular plasticizing role, appropriately reduces its softening point temperature and improves its compatibility with plasticizer. However, the original high crystallinity of PVDC resin has not changed much. The result of copolymerization is that the polymerization is biased
Still larger than PVC.
It is possible to heat and melt vinyl chloride resin to form products, but it is difficult to form and process
2.3.11 ethylene vinylidene chloride (VC) - vinylidene chloride (VDC) copolymer is polyvinylidene chloride
(PVDC) is one of the most widely used resins. This product has two forms: dried powdered resin and original water latex
23111 vinylidene vinylidene
Compared with printed film products, vinyl chloride has lower transmittance to liquid and gas, higher thermal shrinkage, and higher firmness and impact strength than polyvinyl chloride film; The products are flame-retardant and free from bacteria and insects; It is easy to decompose hydrogen chloride and other gases under the action of heat, ultraviolet rays, particle radiation rays, rays), alkaline reagents, and some gold surrounding salts; The product is resistant to a variety of solvents and chemical reagents. It is easy to swell in containing and chlorinating, and easy to swell in concentrated sulfuric acid and nitric acid
Vinyl chloride decomposes.
Vinyl chloride - vinylidene chloride copolymer can be produced by extrusion spinning, calendering and extrusion blow molding.
2.311.2 key points of vinyl chloride vinylidene chloride copolymer forming process
① When vc-vdc copolymer is used to form film or fiber, the resin produced by suspension method with the content of vinylidene chloride of 80% ~ 95% shall be selected; The copolymer used for coating and adhesive shall be produced by lotion method, and the content of vinylidene chloride shall not be greater than 70%.
② Due to the large crystallization tendency of vc-vdc copolymer, water cooling (10 ° C) shall be carried out quickly after extrusion molding or wire drawing, and then enter the preheating bath. In this kind of work
And original water latex
23111 vinylidene vinylidene
Compared with printed film products, vinyl chloride has lower transmittance to liquid and gas, higher thermal shrinkage, and higher firmness and impact strength than polyvinyl chloride film; The products are flame-retardant and free from bacteria and insects; It is easy to decompose hydrogen chloride and other gases under the action of heat, ultraviolet rays, particle radiation rays, rays), alkaline reagents, and some gold surrounding salts; The product is resistant to a variety of solvents and chemical reagents. It is easy to swell in containing and chlorinating, and easy to swell in concentrated sulfuric acid and nitric acid
Vinyl chloride decomposes.
Vinyl chloride - vinylidene chloride copolymer can be produced by extrusion spinning, calendering and extrusion blow molding.
2.311.2 key points of vinyl chloride vinylidene chloride copolymer forming process
① When vc-vdc copolymer is used to form film or fiber, the resin produced by suspension method with the content of vinylidene chloride of 80% ~ 95% shall be selected; The copolymer used for coating and adhesive shall be produced by lotion method, and the content of vinylidene chloride shall not be greater than 70%.
② Due to the large crystallization tendency of vc-vdc copolymer, water cooling (10 ° C) shall be carried out quickly after extrusion molding or wire drawing, and then enter the preheating bath. In this kind of work
Chapter 1 original section
Responsibility: 2-82 aviation B baking - cool acid B delivery co transport property batch
Special material for base, special material for oil union, special material for leather processing net, special material for magnetic card
Lg-13 / 53 1c13 / 60 material lc13 / 78 LC 11 / 78
23.12.2 forming method and Application
Vinyl chloride copolymer can be processed into plastic products by extrusion, injection molding, calendering and blow molding, just like other thermoplastics. It is suitable for hard products with large proportion of filler in raw materials such as asbestos board, floor and hard compact disc.
The process characteristics of vinyl chloride vinyl acetate copolymer molding products are as follows: the soft products can be molded with this resin, and the products can be produced by adding less plasticizing dose to the raw materials or using chlorinated paraffins as auxiliary plasticizers with low plasticizing efficiency. In the production process, as long as the raw materials are measured separately according to the formula requirements, and then mixed evenly, the raw materials can be mixed into pieces on the open mill. Compared with the homopolymer of vinyl chloride with the same molecular weight, the product molded with vinyl chloride vinyl acetate copolymer has lower processing temperature, faster plasticization and shorter production cycle. price
The production units of vinyl chloride vinyl acetate copolymer include Shanghai Tianyuan Group Tianyuan Chemical Co., Ltd., Beijing Huaer Co., Ltd., Tianjin chemical plant, Hangzhou Electrochemical Group Co., Ltd., Jiangsu North chlor alkali Group Co., Ltd. and Nantong Jiangshan Pesticide Chemical Co., Ltd.
23.13 vinyl chloride ethylene vinyl acetate copolymer
Vinyl chloride ethylene vinyl acetate copolymer is a new type of internally plasticized polyvinyl chloride. It has several names: vinyl chloride vinyl acetate copolymer, vinyl chloride grafted vinyl acetate, ethylene vinyl acetate and vinyl chloride grafted copolymer. Abbreviation: VC
Chapter 1 original section
Responsibility: 2-82 aviation B baking - cool acid B delivery co transport property batch
Special material for base, special material for oil union, special material for leather processing net, special material for magnetic card
Lg-13 / 53 1c13 / 60 material lc13 / 78 LC 11 / 78
Qualified products (April - 58): qualified products (55-6575-81), qualified products (73-8a15 ~ 81), qualified products (73-83)
23.12.2 forming method and Application
Vinyl chloride copolymer can be processed into plastic products by extrusion, injection molding, calendering and blow molding, just like other thermoplastics. It is suitable for hard products with large proportion of filler in raw materials such as asbestos board, floor and hard compact disc.
The process characteristics of vinyl chloride vinyl acetate copolymer molding products are as follows: the soft products can be molded with this resin, and the products can be produced by adding less plasticizing dose to the raw materials or using chlorinated paraffins as auxiliary plasticizers with low plasticizing efficiency. In the production process, as long as the raw materials are measured separately according to the formula requirements, and then mixed evenly, the raw materials can be mixed into pieces on the open mill. Compared with the homopolymer of vinyl chloride with the same molecular weight, the product molded with vinyl chloride vinyl acetate copolymer has lower processing temperature, faster plasticization and shorter production cycle. price
The production units of vinyl chloride vinyl acetate copolymer include Shanghai Tianyuan Group Tianyuan Chemical Co., Ltd., Beijing Huaer Co., Ltd., Tianjin chemical plant, Hangzhou Electrochemical Group Co., Ltd., Jiangsu North chlor alkali Group Co., Ltd. and Nantong Jiangshan Pesticide Chemical Co., Ltd.
23.13 vinyl chloride ethylene vinyl acetate copolymer
Vinyl chloride ethylene vinyl acetate copolymer is a new type of internally plasticized polyvinyl chloride. It has several names: vinyl chloride vinyl acetate copolymer, vinyl chloride grafted vinyl acetate, ethylene vinyl acetate and vinyl chloride grafted copolymer. Abbreviation: VC
Manual of molding technician
Evavcevaevag PVC. Polyvinyl chloride · ethylene copolymer containing ethylene) grease is 6% ~ according to different uses, VV is one mass impact
Copolymer (EVA) 30% ~ 60% (mass fraction). (mass fraction); The other is soft plasticized polyvinyl chloride containing ethylene ethyl acetate
2.3.13.1 the performance characteristics and processing performance are excellent. In addition, the temperature range of plasticizing and melting is wide. The products molded by vinyl chloride vinyl acetate copolymer in the resin have different content of vinyl acetate copolymer with high impact strength. The raw materials can be processed into hard, semi-hard or soft products without plasticizer. The EVA in the raw materials can be blended with PV in any proportion: the content and properties of EVA in the copolymer, the polymerization degree of PVC components and the connection
Ring. When the content of ethylene vinyl acetate copolymer (EVA) in the copolymer is 50%, the physical properties, weather resistance, process and stability are aerobic
Weight: about 28%, relative molecular weight: about 100000, relative density: 116, ash content
0.1%, moisture < 0.1%, tensile strength 13.3mpa, elongation 325%, embrittlement
- 50 ℃.
2313.2 molding method and Application
The equipment and process conditions of ethylene ethylene vinyl acetate copolymer molded plastic products are completely the same as those of ordinary PVC resin molded plastic products. Extrusion, injection molding and calendering can be used to form hard, semi-hard and body plastic products with high impact strength and good weather resistance. Such as pipes, plates (sheets), profiles, electrical enclosures, machines
Parts, films, various containers, wire and cable covering materials, etc.
Vinyl chloride vinyl acetate copolymer is a kind of resin with good processing performance and high production efficiency. It can also be used as impact modifier in PVC resin. When molding products with this resin, pay attention to the low plasticizing temperature (not higher than 180 ℃)
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