Shanghai Daoqin Plastics Co., Ltd.

　 ⒈PVC powder resin pellets 状态存 in, 而PVC pellets is many grade pellets formed, method resin grade pellets large small is 1~2μm, emulsion method resin grade pellets large small is 0.1~1μm; method resin pellets dimensions large small is 50~250μm, emulsion method resin pellets dimensions large small is 30~70μm.  

　　⒉PVC is 无定形 polymer/macromolecule polymer, has obvious melting point, in 75~80℃时变 soft, its 玻璃化 temperature degree is 80~85℃; in gas in temperature degree high 于150℃时就会发生 degradation 释放出 chlorine hydrogen, ultra- 180℃则会迅 speed separation understanding.  

　　PVC in low 于160℃时 is pellets 状态, high 于160℃ pellets 会破碎 separation understanding formed grade pellets, ultra- 190℃时初 grade pellets 就会熔 melt.  

　　⒊PVC processing stability property good, is thermoplastic property plastics in most product types; its 160℃ 熔 melt temperature degree high 于140℃ separation understanding temperature degree, therefore pure PVC resin through modified is difficult use melt methods processing production.  

　　 has types modified methods: is in resin in add heat stabilized agent, improve/increase PVC separation understanding temperature degree; is in resin in add increase agent, reduce PVC melt temperature degree.  

　　⑴PVC commonly used heat stabilized agent separation is type: ①铅 salt type, ② has machine type, ③ metal type, ④ dilute type.  

　　铅 salt type is most good and most commonly used, 但不适 combined and transparent products; but also in recent years 无铅化 requirements improve/increase, 欧盟RoHS standards 实施, salt stabilizer 逐渐退出 market.  

　　 has machine type stability good, but also combined transparent products, and has specifications; is its price relatively 贵.  

　　 metal type stability generally, transparent, has or 无毒, very less mono use, generally is combined composite/compounding use, main/primary used for soft products; 钙/ zinc composite/compounding stabilizer its environmental protection, stability 效果也不断 improve/increase, use amount 也越 越 large, can used for electrical cable, type 材, pipe/tube and other.  

　　 dilute type stabilizer is new product types, tool has transparent, and other advantages, its environmental protection property to 质疑.  

　　PVC heat stabilized agent in hard products in application more soft products.  

　　⑵PVC commonly used increase agent is 邻苯二甲 acid ester type, ratio 如DOP, DBP, DIDP and other, increase agent has DOA, DOS, chlorine wax, ring oxygen large 豆油, ester, acid ester and other. environmental protection requirements improve/increase, 邻苯二甲 acid ester type increase agent 越 越受 to made, already prohibited in toys in use, 而DOA也 by prohibited in food film in use. increase agent positive toward acid type, polymer/macromolecule polyester type environmental protection type increase agent development.  

　　PVC increase agent main/primary used for soft products, in hard products in usually add 入5份 below/following, soft products in add 入25份 above.  

　　PVC processing temperature degree need control, selection type screw, but also processing time need amount short.  

　　⒋ high temperature lower certain metal 离子会 add 剧PVC degradation, ratio iron, and other heavy metal 离子, therefore need control heavy metal content, processing front magnetic 选, equipment need 镀铬以 anti generate iron 锈.  

　　⒌PVC melt viscosity large, flow features good, melt strong/high degree low, easy generate melt 破裂, products surface coarse and other phenomenon, especially is hard products; therefore need add processing additives improvement, most commonly used processing additives is ACR. injection molding 时, also attention/notes selection low speed high pressure.  

　　⒍PVC melt has metal toward, melt and melt and processing equipment between scratch force large, need add lubricant retardant force. lubricant separation is inner lubricated （ and PVC resin versus property large ） and outer lubricated （ and PVC resin versus property 差）.  

　　⒎PVC melt belongs to non 牛顿流体, melt viscosity for speed rate 敏感, therefore for/regarding hot property PVC resin 说, in processing process in need reduce viscosity, can through improve/increase screw speed achieve, less adjustment processing temperature degree.  

　　⒏PVC in processing front need drying 处理: 110℃, 1~1.5 small 时.  

　　⒐PVC formulation in separation very more, need separation mixed combined uniform. need attention/notes add material 顺序, property large filler rear add （ anti absorption increase agent ）, lubricant most rear add （ anti effect/influence its it separation dispersion ）; also need control good mixed combined temperature degree, generally hot mixed combined temperature degree in 110℃ left right.  

　　⒑PVC hot separation understanding rear generate chlorine hydrogen HCl, tool has property, property, easy material and screw 腐蚀, therefore need for material and screw surface 进行镀铬处理.