CN110684284A - 一种高强聚丙烯膜裂丝及其制备方法 - Google Patents
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Abstract
本发明公开了一种高强聚丙烯膜裂丝及其制备方法,制备的高强聚丙烯膜裂丝,聚丙烯膜裂丝纤度在800‑1400分特之间,单丝强度≥6.0cN/dtex,断裂伸长率为15‑20%。本发明产品性能优异,强度高。
Description
技术领域
本发明涉及一种高强聚丙烯膜裂丝及其制备方法。
背景技术
聚丙烯(PP)具有来源丰富、合成方法简单、密度小、化学稳定性好、价格适中、成型加工容易等优点,广泛应用于工程纤维和塑料等加工领域。由于PP较高的强度、优良的耐腐蚀性和电绝缘性,近年来,缆绳、土工布、编织袋等工程纤维领域对聚丙烯膜裂丝的需求越来越大,聚丙烯膜裂丝有一道生产工序就是利用针辊机膜裂开网,开网使其强度损失约20-40%,当针辊上的针距越大时,强度损失越多。因此普通的聚丙烯膜裂丝存在强度不高、韧性差等缺陷,需要进一步改进。
PP为易生成大球晶的结晶聚合物,弹性体、纳米粒子等添加剂作为分散相可以有效地抑制PP的结晶,使其形成微晶,引发银纹和剪切带,提高其强度;PE晶体与PP晶体之间发生相互制约作用,破坏PP球晶结构,分割成晶片,并进一步被细化。利用上述机理,本发明采用乙烯-1-辛烯共聚物(POE)、线性低密度聚乙烯(LLDPE)和纳米碳酸钙(CaCO3)作为协同增韧增强剂,利用双螺杆对聚丙烯原料进行共混增强改性,并在开网前通过三级拉伸工艺,提高未开网模的强度,将最终成品的强度损失将至最低。
发明内容
本发明的目的在于提供一种产品性能优异,制备方便的高强聚丙烯膜裂丝及其制备方法。
本发明的技术解决方案是:
将PP、POE、LLDPE、CaCO3混合均匀后,利用双螺杆熔融挤出,初生薄膜经液体骤冷成形后,经提膜机等距分割,三级拉伸后开网、定型、上油、收卷。
一种高强聚丙烯膜裂丝,其特征是:
聚丙烯膜裂丝纤度在800-1400分特之间,单丝强度≥6.0cN/dtex,断裂伸长率为15-20%。
一种所述的高强聚丙烯膜裂丝的制备方法,其特征是:
包括下列步骤:将各原料组分(PP、POE、LLDPE、CaCO3)均匀混合;在双螺杆挤出机中进行熔融共混并挤出,再经过液体冷却、三级拉伸、热定型、卷绕,制成产品;双螺杆一到十区的纺丝温度为120℃、130℃、150℃、180℃、180℃、180℃、200℃、200℃、190℃、190℃,出膜模头温度:190℃,液体冷却温度为12℃,三级总拉伸倍率为14倍,各级拉伸倍数分别为6、1.2、1.95倍,三级拉伸温度分别为110℃、130℃、140℃,热定型温度为110℃;液体冷却的冷却液为水。在熔融挤出机中进行熔融共混时,加入的三种助剂为乙烯-1-辛烯共聚物(POE)、线性低密度聚乙烯(LLDPE)和纳米碳酸钙(CaCO3),三种添加剂的加入量均为8%。
共混原料由下列质量份组成见下表:
本发明产品性能优异,强度高。
下面结合实施例对本发明作进一步说明。
具体实施方式
一种高强聚丙烯膜裂丝,聚丙烯膜裂丝纤度在800-1400分特之间,单丝强度≥6.0cN/dtex,断裂伸长率为15-20%。
一种所述的高强聚丙烯膜裂丝的制备方法,包括下列步骤:将各原料组分(PP、POE、LLDPE、CaCO3)均匀混合,在双螺杆挤出机中进行熔融共混并挤出,再经过液体冷却、三级拉伸、热定型、卷绕,制成产品;双螺杆一到十区的纺丝温度为120℃、130℃、150℃、180℃、180℃、180℃、200℃、200℃、190℃、190℃,出膜模头温度:190℃,液体冷却温度为12℃,三级总拉伸倍率为14倍,各级拉伸倍数分别为6、1.2、1.95倍,三级拉伸温度分别为110℃、130℃、140℃,热定型温度为110℃;液体冷却的冷却液为水。上述三种助剂乙烯-1-辛烯共聚物(POE)、线性低密度聚乙烯(LLDPE)和纳米碳酸钙(CaCO3)的加入量均为PP 质量的8%。
Claims (2)
1.一种高强聚丙烯膜裂丝,其特征是:聚丙烯膜裂丝纤度在800-1400分特之间,单丝强度≥6.0cN/dtex,断裂伸长率为15-20%。
2. 一种所述的高强聚丙烯膜裂丝的制备方法,其特征是:包括下列步骤:将各原料组分PP、POE、LLDPE、CaCO3均匀混合,在双螺杆挤出机中进行熔融共混并挤出,再经过液体冷却、三级拉伸、热定型、卷绕,制成产品;双螺杆一到十区的纺丝温度为120℃、130℃、150℃、180℃、180℃、180℃、200℃、200℃、190℃、190℃,出膜模头温度:190℃,液体冷却温度为12℃,三级总拉伸倍率为14倍,各级拉伸倍数分别为6、1.2、1.95倍,三级拉伸温度分别为110℃、130℃、140℃,热定型温度为110℃;液体冷却的冷却液为水; POE、LLDPE、CaCO3的加入量均为PP 质量的8%。
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