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PE胶袋有哪些特性及特点

来源: 时间:2020-03-25 17:03:44 浏览次数:

PE胶袋是塑料袋的一种,PE袋分高密度的和低密度的。高密度的更加坚韧,透明度高,手感硬挺,价格相对较贵。一般超市给的塑料袋都是高密度PE袋。低密度PE袋就是一般市场卖菜给的普通的那种摸上去很软的袋子,品质较次,透明度差,价格便宜。


PE = Polyethylene,聚乙烯,是结构最简单的高分子有机化合物,当今世界应用最广泛的高分子材料,由乙烯聚合而成,根据密度的不同分为高密度聚乙烯、中密度聚乙烯和低密度聚乙烯。

低密度聚乙烯较软,多用高压聚合;高密度聚乙烯具有刚性、硬度和机械强度大的特性,多用低压聚合。高密度聚乙烯可以做容器、管道,也可以做高频的电绝缘材料,用于雷达和电视。大量使用的常为低密度(高压)聚乙烯。聚乙烯为蜡状,有蜡一样的光滑感,不染色时,低密度聚乙烯透明,而高密度聚乙烯不透明。 聚乙烯是通过乙烯(CH2=CH2)的加成反应和聚合反应,由重复的–CH2–单元连接而成的高聚合链。聚乙烯的性能取决于它的聚合方式;在中等压力(15-30大气压)有机化合物催化条件下进行Ziegler-Natta聚合而成的是高密度聚乙烯(HDPE)。这种条件下聚合的聚乙烯分子是线性的,且分子链很长,分子量高达几十万。如果是在高压力(100-300MPa),高温(190–210C),过氧化物催化条件下自由基聚合,生产出的则是低密度聚乙烯(LDPE),它是支化结构的。东莞PE胶袋

聚乙烯不溶于水,吸水性很小,就是对一些化学溶剂,如甲苯、醋酸等,也只有在70℃以上温度时才略有溶解。但是微粒状的聚乙烯,可以在15℃~40℃之间随温度的变化熔化或凝固,温度升高时熔化,吸收热量;温度降低时凝固,放出热量。又因为它吸水量很小,不易潮湿,有绝缘性能,因此是很好的建筑材料。


PE胶袋特性:


PE袋重量=L(cm)*w(cm)*T(cm)*0.155*0.00263/2.2046


PE袋尺寸的表达方法:开口尺寸在最前面厚度在后面。

PE袋宽=正方关管边长*2.5


PE特点:

★聚合压力大小:高压、中压、低压;

★聚合实施方法:淤浆法、溶液法、气相法;

★产品密度大小:高密度、中密度,低密度,线性低密度;
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