塑料制品發脆怎么辦
發(fa)(fa)(fa)脆(cui)(cui)(cui)是(shi)指制件在某(mou)些(xie)部位(wei)出現容(rong)(rong)(rong)易開裂(lie)或折(zhe)斷。發(fa)(fa)(fa)脆(cui)(cui)(cui)主要是(shi)由(you)于材(cai)料降(jiang)(jiang)(jiang)解(jie)而(er)(er)導致大(da)(da)(da)分(fen)子(zi)斷鏈,降(jiang)(jiang)(jiang)低了大(da)(da)(da)分(fen)子(zi)的相對(dui)分(fen)子(zi)質量,從而(er)(er)使聚合(he)物的整體物理性能下降(jiang)(jiang)(jiang)。制品發(fa)(fa)(fa)脆(cui)(cui)(cui)很(hen)大(da)(da)(da)一部分(fen)是(shi)由(you)于內(nei)應力造成的。造成制品發(fa)(fa)(fa)脆(cui)(cui)(cui)的原(yuan)因很(hen)多,主要有:1、設(she)備方面(mian)(1) 機(ji)(ji)筒(tong)內(nei)有死解(jie)或障(zhang)礙物,容(rong)(rong)(rong)易引起(qi)熔料降(jiang)(jiang)(jiang)解(jie)。(2) 機(ji)(ji)器(qi)塑(su)(su)化容(rong)(rong)(rong)量太小(xiao),塑(su)(su)料在機(ji)(ji)筒(tong)內(nei)塑(su)(su)化不(bu)充分(fen);機(ji)(ji)器(qi)塑(su)(su)化容(rong)(rong)(rong)量太大(da)(da)(da),塑(su)(su)料在機(ji)(ji)筒(tong)內(nei)受(shou)熱(re)和(he)受(shou)剪切作(zuo)用的時間(jian)過長,塑(su)(su)料容(rong)(rong)(rong)易老化,使制品發(fa)(fa)(fa)脆(cui)(cui)(cui)。(3) 頂出裝置傾斜或者(zhe)不(bu)平(ping)衡,頂桿截面(mian)積(ji)或者(zhe)分(fen)布不(bu)當(dang)。2、模具方面(mian)(1) 澆口太小(xiao),應考慮調..