CN111016360A - 一种耐高温抗蠕变聚乙烯热收缩膜及其吹膜工艺 - Google Patents
一种耐高温抗蠕变聚乙烯热收缩膜及其吹膜工艺 Download PDFInfo
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Abstract
本发明属于塑料薄膜领域，尤其是一种耐高温抗蠕变聚乙烯热收缩膜及其吹膜工艺，针对现有聚乙烯热收缩膜由于其材料本身的原因，在较高的温度下使用，比如60摄氏度以上的高温环境，其抗蠕变性能较差的问题，现提出如下方案；其一种耐高温抗蠕变聚乙烯热收缩膜，由内层、中间层和外层共挤而成，其中，所述内层和外层的原料由下述按质量百分比计的组成：线性低密度聚乙烯11‑32％，超高分子量聚乙烯25‑73％。本发明的超低磨耗抗蠕变聚乙烯具有卓越的抗载荷变形能力，超低磨耗抗蠕变聚乙烯在标准载荷下其抗载荷变形曲线在短时间后趋于平坦，60摄氏度以上的高温环境，其抗蠕变性能较好。
Description
技术领域
本发明涉及塑料薄膜技术领域，尤其涉及一种耐高温抗蠕变聚乙烯热收缩膜及其吹膜工艺。
背景技术
新型超低磨耗抗蠕变聚乙烯是指一类具有特殊分子拓扑结构的聚乙烯高分子材料，与相同类型的材料相比，新型超低磨耗抗蠕变聚乙烯的磨耗系数远远低于通用的低磨耗高分子材料---超高分子量聚乙烯，超低磨耗抗蠕变聚乙烯在标准载荷下其抗载荷变形曲线在短时间后趋于平坦，而完全相同测试条件下高交联超超高分子量聚乙烯的载荷变形曲线一直上升，因此超低磨耗加上抗蠕变性使得ULW-PE成为替代超高分子量聚乙烯作为人工关节材料的首选材料，超低磨耗抗蠕变聚乙烯材料还具有卓越的抗冲击性能，其抗冲强度时普通高密度聚乙烯材料的3-10倍，因此ULW-PE还可以用作高抗冲材料；
然而现有的聚乙烯热收缩膜由于其材料本身的原因，在较高的温度下使用，比如60摄氏度以上的高温环境，其抗蠕变性能较差。
发明内容
本发明的目的是为了解决现有技术中存在聚乙烯热收缩膜由于其材料本身的原因，在较高的温度下使用，比如60摄氏度以上的高温环境，其抗蠕变性能较差的缺点，而提出的一种耐高温抗蠕变聚乙烯热收缩膜及其吹膜工艺。
为了实现上述目的，本发明采用了如下技术方案：
一种耐高温抗蠕变聚乙烯热收缩膜，由内层、中间层和外层共挤而成，其中，所述内层和外层的原料由下述按质量百分比计的组成：
线性低密度聚乙烯 11-32％
超高分子量聚乙烯 25-73％
茂金属聚乙烯 23-68％；
所述中间层的超高分子量聚乙烯原料由下述按质量百分比计的聚合催化剂制备：
优选的，所述内层和外层的原料由下述按质量百分比计的组成：
线性低密度聚乙烯 19.81％
超高分子量聚乙烯 56.24％
茂金属聚乙烯 23.95％；
所述内层和外层聚乙烯原料由下述按质量百分比计的聚合催化剂制备：
优选的，所述主催化剂的合成包括配体有机化合物的多步合成技术和金属元素与有机配位体的络合反应。
优选的，所述助催化剂是有全氟取代的三芳基硼、全氟取代的四芳基硼盐、聚甲基铝氧烷和改性聚甲基铝氧烷组成。
优选的，所述活化剂是由三烷基铝、聚甲基铝氧烷和改性聚甲基铝氧烷组成。
一种耐高温抗蠕变聚乙烯热收缩膜的吹膜工艺，将上述各层原料混合搅拌均匀后，通过三层共挤吹膜机挤出制得。
与现有技术相比，本发明的有益效果在于：
本方案除杂剂浓度为100-200PPM，聚合温度：70-90摄氏度，聚合压力为1.0-3.0MPa，锚式或同轴双推进式的搅拌方式，搅拌速率为400-900rph，聚合时间为60-300分钟，分子量分布窄和分子量可控，具有特殊拓扑结构的高分子链规整度高，高度结晶，易于熔融注塑和3D打印精密加工，是人工关节和工业耐磨制品的首选有机高分子材料，在特定的乙烯压力范围内、在特定的聚合反应温度范围内、在特定的聚合反映介质中生产指定的聚合物产品的技术；
本发明的超低磨耗抗蠕变聚乙烯具有卓越的抗载荷变形能力，超低磨耗抗蠕变聚乙烯在标准载荷下其抗载荷变形曲线在短时间后趋于平坦，60摄氏度以上的高温环境，其抗蠕变性能较好。
具体实施方式
实施例一
一种耐高温抗蠕变聚乙烯热收缩膜，由内层、中间层和外层共挤而成，其中，内层和外层的原料由下述按质量百分比计的组成：
线性低密度聚乙烯 11-32％
超高分子量聚乙烯 25-73％
茂金属聚乙烯 23-68％；
本实施例中，中间层的超高分子量聚乙烯原料由下述按质量百分比计的催化剂组成制备：
本实施例中，内层和外层的原料由下述按质量百分比计的组成：
线性低密度聚乙烯 19.81％
超高分子量聚乙烯 56.24％
茂金属聚乙烯 23.95％；
本实施例中，内层和外层的聚乙烯原料由下述按质量百分比计的催化剂组成制备：
本实施例中，主催化剂的合成包括配体有机化合物的多步合成技术和金属元素与有机配位体的络合反应。
本实施例中，助催化剂是有全氟取代的三芳基硼、全氟取代的四芳基硼盐、聚甲基铝氧烷和改性聚甲基铝氧烷组成。
本实施例中，活化剂是由三烷基铝、聚甲基铝氧烷和改性聚甲基铝氧烷组成。
一种耐高温抗蠕变聚乙烯热收缩膜的吹膜工艺，将上述各层原料混合搅拌均匀后，通过三层共挤吹膜机挤出制得。
本实施例中，除杂剂浓度为100-200PPM，聚合温度：70-90摄氏度，聚合压力为1.0-3.0MPa，锚式或同轴双推进式的搅拌方式，搅拌速率为400-900rph，聚合时间为60-300分钟，在低温和低压乙烯气体条件下制备的特种超低磨耗抗蠕变聚乙烯材料，分子量分布窄Mw/Mn＝2.5-3.5和分子量可控Mw＝20—150万克/摩尔，具有特殊拓扑结构的高分子链规整度高，高度结晶，易于熔融注塑和3D打印精密加工，是人工关节和工业耐磨制品的首选有机高分子材料，聚合反应工程技术是在催化剂技术确定的前提下，在特定的乙烯压力范围内、在特定的聚合反应温度范围内、在特定的聚合反映介质中生产指定的聚合物产品的技术，溶剂淤浆法聚合反应工艺还可以选择间歇式一般CSTR反应釜或连续式CSTR或LOOP反应釜生产；
本发明的超低磨耗抗蠕变聚乙烯具有卓越的抗载荷变形能力，超低磨耗抗蠕变聚乙烯在标准载荷下其抗载荷变形曲线在短时间后趋于平坦，60摄氏度以上的高温环境，其抗蠕变性能较好。
实施例2
一种耐高温抗蠕变聚乙烯热收缩膜，由内层、中间层和外层共挤而成，其中，内层和外层的原料由下述按质量百分比计的组成：
线性低密度聚乙烯 11-32％
超高分子量聚乙烯 25-73％
茂金属聚乙烯 23-68％；
本实施例中，中间层的超高分子量聚乙烯原料由下述按质量百分比计的催化剂组成制备：
本实施例中，内层和外层的聚乙烯原料由下述按质量百分比计的催化剂组成制备：
线性低密度聚乙烯 14.81％
超高分子量聚乙烯 60.24％
茂金属聚乙烯 24.95％；
本实施例中，内参和外层的原料由下述按质量百分比计的组成：
本实施例中，主催化剂的合成包括配体有机化合物的多步合成技术和金属元素与有机配位体的络合反应。
本实施例中，助催化剂是有全氟取代的三芳基硼、全氟取代的四芳基硼盐、聚甲基铝氧烷和改性聚甲基铝氧烷组成。
本实施例中，活化剂是由三烷基铝、聚甲基铝氧烷和改性聚甲基铝氧烷组成。
一种耐高温抗蠕变聚乙烯热收缩膜的吹膜工艺，将上述各层原料混合搅拌均匀后，通过三层共挤吹膜机挤出制得。
本实施例中，除杂剂浓度为100-200PPM，聚合温度：70-90摄氏度，聚合压力为1.0-3.0MPa，锚式或同轴双推进式的搅拌方式，搅拌速率为400-900rph，聚合时间为60-300分钟，在低温和低压乙烯气体条件下制备的特种超低磨耗抗蠕变聚乙烯材料，分子量分布窄Mw/Mn＝2.5-3.5和分子量可控Mw＝20—150万克/摩尔，具有特殊拓扑结构的高分子链规整度高，高度结晶，易于熔融注塑和3D打印精密加工，是人工关节和工业耐磨制品的首选有机高分子材料，聚合反应工程技术是在催化剂技术确定的前提下，在特定的乙烯压力范围内、在特定的聚合反应温度范围内、在特定的聚合反映介质中生产指定的聚合物产品的技术，溶剂淤浆法聚合反应工艺还可以选择间歇式一般CSTR反应釜或连续式CSTR或LOOP反应釜生产；
本发明的超低磨耗抗蠕变聚乙烯具有卓越的抗载荷变形能力，超低磨耗抗蠕变聚乙烯在标准载荷下其抗载荷变形曲线在短时间后趋于平坦，60摄氏度以上的高温环境，其抗蠕变性能较好。
Claims (6)
1.一种耐高温抗蠕变聚乙烯热收缩膜，其特征在于：由内层、中间层和外层共挤而成，其中，所述内层和外层的原料由下述按质量百分比计的组成：
线性低密度聚乙烯 11-32％
超高分子量聚乙烯 25-73％
茂金属聚乙烯 23-68％；
所述中间层的原料由下述按质量百分比计的催化剂组成制备：
2.根据权利要求1所述的一种耐高温抗蠕变聚乙烯热收缩膜，其特征在于：由内层、中间层和外层共挤而成，其中，所述内层和外层的原料由下述按质量百分比计的组成：
线性低密度聚乙烯 19.81％
超高分子量聚乙烯 56.24％
茂金属聚乙烯 23.95％；
所述中间层的原料由下述按质量百分比计的催化剂组成制备：
3.根据权利要求1所述的一种耐高温抗蠕变聚乙烯热收缩膜，其特征在于，所述主催化剂的合成包括配体有机化合物的多步合成技术和金属元素与有机配位体的络合反应。
4.根据权利要求1所述的一种耐高温抗蠕变聚乙烯热收缩膜，其特征在于，所述助催化剂是有全氟取代的三芳基硼、全氟取代的四芳基硼盐、聚甲基铝氧烷和改性聚甲基铝氧烷组成。
5.根据权利要求1所述的一种耐高温抗蠕变聚乙烯热收缩膜，其特征在于，所述活化剂是由三烷基铝、聚甲基铝氧烷和改性聚甲基铝氧烷组成。
6.一种耐高温抗蠕变聚乙烯热收缩膜的吹膜工艺，其特征在于，将上述各层树脂原料混合搅拌均匀后，通过三层共挤吹膜机挤出制得。
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