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PVC crisp, thermal stability, not easy processing. Cannot be used directly, must pass a modified mixed, adding additives, PVC generally to modified granulation, after preparation of particles, plasticizing, more fully processing also more easy, especially the process is injection molding product. Strictly speaking, has the special requirements of PVC products, PVC modified formula, is tailored according to customer requirements. Domestic formula design of PVC modified materials, manufacturing has reached the international advanced level, there are a number of products have been exported abroad, the plastic technology co. , LTD in zhejiang hall is represented with independent intellectual property rights of enterprises; Also is in the process of PVC production came derivatives, and the variety of such modification with vinyl chloride copolymer, PVC blend and chlorinated polyvinyl chloride (PVC), etc.
1, vinyl chloride copolymer
can PVC, vinyl chloride and ethylene, propylene, vinyl acetate, vinylidene chloride, acrylonitrile and acrylic ester monomer copolymerization, copolymer of yield less than 25% of the total PVC production.
1) vinyl chloride - Vinyl acetate copolymer by suspension copolymerization method, the general production of vinyl acetate content of 3% ~ 5% and 13% ~ 15% of two grades, the floor can be used to make plastics, coating, film, molding products, record and short fiber, etc.
(2) the vinyl chloride - Vinylidene chloride copolymer dow chemical company in the 30 s was successfully developed vinylidene chloride content in more than 50% of vinyl chloride copolymer, commodity name saran B ( Saran B) This kind of copolymer ageing resistance, ozone resistance, good mechanical performance, can be dissolved in tetrahydrofuran, cyclohexanone and chlorobenzene organic solvent, solution has good adhesiveness and film. A film made with this kind of copolymer non-toxic, transparent, has the extremely low permeability and moisture permeability, and is an excellent food packaging materials. The copolymer is a kind of excellent corrosion resistant material. Made by its chlorofibre fiber says, to do fishing nets, seat cushion braid and chemical filter cloth, etc.
3. Propylene - Vinyl chloride or ethylene - vinyl chloride copolymer of propylene content, about 10% of the copolymer used for blow molding and injection molding, etc. With vinyl chloride - Vinyl acetate copolymer, low processing temperature, and thermal decomposition temperature interval is big, good melt flow, non-toxic, transparency. Ethylene - Vinyl chloride copolymer and 1 in 75 ℃ by suspension method and pressure. 2 ~ 96 mpa copolymerization, ethylene content is 4% ~ 43%, high impact resistance, high transparency and excellent processing performance, non-toxic, can be made transparent film, container, etc.
4 vinyl chloride with ethylene/vinyl acetate copolymers vinyl chloride graft copolymer resin as base material, has excellent impact resistance, weather resistance and heat resistance, suitable for outdoor use building materials. With polyacrylate and graft copolymer of vinyl chloride. In Western Europe, the graft copolymer has gradually replaced the trend of the corresponding blend.
HPVC/SBR blend thermoplastic elastomer
2, PVC blend
PVC sheet with other resin and PVC blend, is a good method can in many aspects to improve the performance of PVC. By mechanical blending method make PVC and ethylene - Vinyl acetate resin blend, can have long-lasting plasticizing effect, improve the impact strength, cold resistance and processability. Chlorinated polyvinyl chloride (PVC) and nitrile rubber, polyethylene or ABS resin blend, also can significantly improve the toughness, cold resistance and processability. With methyl methacrylate (mma) - butadiene - styrene copolymer ( See the polystyrene) Blend, not only the impact strength is high, and can be transparent products. The research and production of PVC blend, increasing varieties, use scope expands unceasingly.
3, chlorinated polyvinyl chloride (PVC)
PVC by chlorination and a thermoplastic resin, by solution method, chloride, commonly known as ethylene perchloride, referred to as 'CPVC, chlorinity 61 ~ 68%, hydrogen atoms not all be replaced by chlorine. White or yellowish powder, purple solubility is better than PVC, soluble in acetone, chlorobenzene, dichloroethane and tetrachloroethane, high heat resistance than PVC 20 ~ 40 ℃, the cold resistance is lower than PVC about 25 ℃, nonflammable, weather resistance, chemical resistance and water resistance are optimal, can use the production pipe extrusion method, used mainly for hot water pipes. Chlorinated polyvinyl chloride solution has good adhesion, film and fiber forming, can be used in adhesives, varnish and spinning. Adhesive is mainly used for bonding PVC board and its products. Varnish film corrosion, soft, high wear resistance and peel strength, with it spun silk said chlorofibre, are stable to acid, alkali, salt, suitable for chemical corrosion resistance of filter cloth, overalls, screen mesh, fishing nets and conveyor belt, etc.
there are two kinds of production methods of CPVC.
color wide PVC waterproof
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