Shanghai Daoqin Plastics Co., Ltd.

        PP polypropylene (PP) modified material shrinkage rate 控/ made is polypropylene (PP) modified important 方面. shrinkage rate 控/ made good for polypropylene (PP) modified material use has important 意义, meanwhile is ensure product quality important 方面. especially is application modified polypropylene (PP) 取代传统 engineering plastics, shrinkage rate this 一点显 十 separation important.

         mineral filled for polypropylene (PP) PP modified plastics molding shrinkage effect/influence

         polypropylene (PP) PP use material additives main/primary has carbon acid 钙, slip powder, powder and other. various material add agent for polypropylene (PP) molding shrinkage effect/influence, can 看出矿 material add agent for PP modified material molding shrinkage effect/influence comparison obvious.

        矿 material add agent for polypropylene (PP) modified material molding shrinkage effect/influence main/primary has 三 方面:

        一 is material add agent 本身不 shrinkage, it add from overall ratio/proportion upper reduce polypropylene (PP) modified material shrinkage rate;

        二 is material add agent add 入必然 effect/influence polypropylene (PP) crystallization degree, from effect/influence shrinkage rate;

        三 is micro fine material agent add rear, to types nucleating agent function, polypropylene (PP) structure 状态, anti large 球晶 形 formed, effect/influence polypropylene (PP) molding shrinkage.

         glass fiber (GF) for polypropylene (PP) PP modified plastics molding shrinkage effect/influence

         glass fiber (GF) for polypropylene (PP) PP modified material molding shrinkage effect/influence most large. glass fiber content to 30%时 above 时, its polypropylene (PP) modified material molding shrinkage from 1.8 decline 至0.5, but also surface treatment glass fiber (GF) for molding shrinkage effect/influence large 于未进行处理 glass fiber (GF). glass fiber (GF) add 入一则破/ bad polypropylene (PP) crystallization degree, effect/influence shrinkage rate, more important is glass fiber 限/ made polypropylene (PP) crystallization shrinkage.

         polyethylene (PE) add for polypropylene (PP) molding shrinkage effect/influence

         polyethylene (PE) add effect/influence polypropylene (PP) modified material molding shrinkage. although polyethylene (PE) is types high crystallization degree plastics, molding shrinkage very large, in add polypropylene (PP) in rear versus different degree 破/ bad crystallization degree, make overall molding shrinkage decline.

         polypropylene (PP) 自身MI(熔脂) for molding shrinkage effect/influence

         polypropylene (PP) molding shrinkage its crystallization degree effect/influence, crystallization degree also its molecular weight large small effect/influence. 当MI increase large 时, molecular weight decrease small, its crystallization speed degree increase large, molding shrinkage increase large. polypropylene (PP) MI变化时 for molding shrinkage has effect/influence.

         summary

        ①: glass fiber (GF), material 质, elastomer, polyethylene (PE), MI for PP modified plastics shrinkage rate effect/influence is: glass fiber (GF) >矿 material 质> elastomer > polyethylene (PE) >MI.

        ②: polypropylene (PP) crystallization degree is 控/ made polypropylene (PP) modified material molding shrinkage key/critical in.