CN106046519A - 耐高温收缩型保护膜及其制备方法 - Google Patents
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Abstract
本发明公开了一种耐高温收缩型保护膜及其制备方法，该耐高温收缩型保护膜由内层、中间层和外层共挤而成，所述内层和外层的原料按质量份包括：线性低密度聚乙烯70‑90份；双酚A型环氧树脂20‑40份；甲基苯基硅树脂20‑40份；抗氧剂1‑3份；热稳定剂1‑5份；固化剂5‑10份；聚乙烯抗静电剂2‑10份；所述中间层的原料按质量份包括：高压低密度聚乙烯70‑90份；双马来酰亚胺25‑35份；二烯丙基双酚25‑35份；氧化铝2‑10份；抗氧剂1‑3份；热稳定剂1‑5份；固化剂5‑10份；聚乙烯抗静电剂2‑10份。本发明的耐高温收缩型保护膜，在高温条件下仍具有优异且稳定的力学性能，且其制备方法简单。
Description
技术领域
本发明涉及塑料薄膜技术领域，尤其是一种耐高温收缩型保护膜及其制备方法。
背景技术
热收缩膜是一种在生产过程中被定向拉伸，在使用过程中受热收缩的热塑性塑料薄膜，用于各种产品的销售和运输，其主要作用是稳固、遮盖和保护产品。收缩膜必须具有较高的耐穿刺性，良好的收缩性和一定的收缩应力。按材料分，热收缩膜包括PE热收缩膜、POF热收缩膜等等。
随着我国经济的持续发展，包装行业对热收缩膜的需求量日益增多，应用范围也不断扩大，由于热收缩膜不仅在力学性能、包装、贮存、运输、防潮和外观等方面具有良好的综合性能，易于回收和原料的循环使用，满足了环保的要求，而且在自动包装线上提高了包装效率，降低了综合包装成本，正逐步取代传统的包装成为散件集合包装首选。
现有的热收缩膜，由于其材料本身的原因，在较高的温度下使用，其收缩性能、拉伸性能等会显著变差，所以，提供一种较高温度下仍具有优异且稳定的收缩性能、良好的韧性和较高的强度的耐高温收缩型保护膜显得日益重要。
发明内容
本发明所要解决的技术问题在于针对上述现有技术中的不足，提供一种耐高温收缩型保护膜，其在高温条件下仍具有优异且稳定的收缩性能，且具有很好的韧性和强度，不易破损，且其制备方法简单，生产成本低。
为解决上述技术问题，本发明采用的技术方案是：一种耐高温收缩型保护膜，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按质量份包括：
所述中间层的原料按质量份包括：
作为本发明进一步的方案，所述内层和外层的原料按质量份包括：
所述中间层的原料按质量份包括：
其中，所述的甲基苯基硅树脂其聚合物分子是以Si-O键为主链，有机基团为侧链，使其具有良好的耐高温性、抗疲劳强度和耐候性，通过甲基苯基硅树脂与线性低密度聚乙烯共聚能有效提高制备的成品膜的耐高温性能。
其中，双酚A型环氧树脂大分子末端有环氧基,链中间有羟基和醚键,在固化过程中还会继续产生羟基和醚键,结构中含有苯环或杂环，这些结构使双酚A型环氧树脂具有粘接强度高、耐介质性好、易于改性等特点。双酚A型环氧树脂的加入使线性低密度聚乙烯和双酚A型环氧树脂得到改性，一方面能显著提高制备的成品膜的耐高温性，另一方面还能提高其粘性和热稳定性。
其中，双马来酰亚胺与二烯丙基双酚的配合使用，通过与高压低密度聚乙烯形成共聚物，能显著提高耐高温收缩型保护膜中间层的耐高温性、耐湿性和耐老化性。利用二烯丙基双酚对双马来酰亚胺的改性，能解决双马来酰亚胺本身存在溶解性差、固化物脆的缺点，使制备的成品膜保持有良好的韧性。
其中，氧化铝以粉末形式添加，氧化铝的添加能极大地提高成品膜的耐高温性能，同时还能提高成品膜的强度。
优选的是，所述固化剂为间苯二胺、二氨基二苯基甲烷和六氢化邻苯二甲酸酐中的一种，其均具有多官能度或具有稳定的化学结构，选用间苯二胺、二氨基二苯基甲烷和六氢化邻苯二甲酸酐中的一种作为固化剂，一方面能促进各原料形成的混合物固化，另一方面还能有效提高成品膜的热稳定性。
优选的是，所述抗氧剂为对苯二胺、二氢喹啉、2，6-三级丁基-4-甲基苯酚和硫代二丙酸双酯中的一种或多种的混合物。
优选的是，所述聚乙烯抗静电剂由低密度聚乙烯和乙氧基化烷基酸胺组成。
优选的是，所述热稳定剂为2-乙基己酸盐、酚盐、苯甲酸盐、硬脂酸盐、二氢吡啶和二酮中的一种或多种的混合物。
一种耐高温收缩型保护膜的制备方法，包括以下步骤：
1)按照重量份分别称取内层和外层的原料、中间层的原料；
2)选用两台炼塑机，将步骤1)中的两种原料分别加入到两台炼塑机中，均在130-150℃的温度下塑炼4-5次；
3)将步骤2)中处理后的两种原料取出，通过三层共挤机挤出制得成品。
本发明的有益效果：本发明的耐高温收缩型保护膜，在高温条件下仍具有优异且稳定的收缩性能，且具有很好的韧性和强度，不易破损，使用效果明显，无污染，应用范围广，且本发明提供的耐高温收缩型保护膜的制备方法简单，生产成本低。
具体实施方式
下面结合实施例对本发明作进一步说明。
实施例1
一种耐高温收缩型保护膜，由内层、中间层和外层共挤而成，其中，
内层和外层的原料按质量份包括：
中间层的原料按质量份包括：
一种耐高温收缩型保护膜的制备方法，具体步骤如下：
(1)按照重量份分别称取内层和外层的原料、中间层的原料；
(2)选用两炼塑机，将步骤(1)中的两种原料分别加入到两炼塑机中，均在130℃的温度下进行塑炼5次；
(3)将步骤(2)中处理后的两种原料取出，通过三层共挤机挤出制得成品。
实施例2
一种耐高温收缩型保护膜，由内层、中间层和外层共挤而成，其中，
内层和外层的原料按质量份包括：
中间层的原料按质量份包括：
一种耐高温收缩型保护膜的制备方法，具体步骤如下：
(1)按照重量份分别称取内层和外层的原料、中间层的原料；
(2)选用两炼塑机，将步骤(1)中的两种原料分别加入到两炼塑机中，均在130℃的温度下进行塑炼5次；
(3)将步骤(2)中处理后的两种原料取出，通过三层共挤机挤出制得成品。
耐高温收缩型保护膜的性能检测：
对实施例1和实施例2制备的耐高温收缩型保护膜分别测试其在50℃、70℃和90℃力学性能，测结果如下：
表一：50℃条件下的力学性能
表二：70℃条件下的力学性能
表三：90℃条件下的力学性能
从测试结果可以看出，该耐高温收缩型保护膜在高温下任具有优异且稳定的收缩性能和拉伸强度。
尽管本发明的实施方案已公开如上，但其并不仅仅限于说明书和实施方式中所列运用。它完全可以被适用于各种适合本发明的领域。对于熟悉本领域的人员而言，可容易地实现另外的修改。因此在不背离权利要求及等同范围所限定的一般概念下，本发明并不限于特定的细节。
Claims (7)
1.一种耐高温收缩型保护膜，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按质量份包括：
所述中间层的原料按质量份包括：
2.根据权利要求1所述的一种耐高温收缩型保护膜，其特征在于，所述内层和外层的原料按质量份包括：
所述中间层的原料按质量份包括：
3.根据权利要求1或2所述的一种耐高温收缩型保护膜，其特征在于，所述固化剂为间苯二胺、二氨基二苯基甲烷和六氢化邻苯二甲酸酐中的一种。
4.根据权利要求1或2所述的一种耐高温收缩型保护膜，其特征在于，所述抗氧剂为对苯二胺、二氢喹啉、2，6-三级丁基-4-甲基苯酚和硫代二丙酸双酯中的一种或多种的混合物。
5.根据权利要求1或2所述的一种耐高温收缩型保护膜，其特征在于，所述聚乙烯抗静电剂由低密度聚乙烯和乙氧基化烷基酸胺组成。
6.根据权利要求1或2所述的一种耐高温收缩型保护膜，其特征在于，所述热稳定剂为2-乙基己酸盐、酚盐、苯甲酸盐、硬脂酸盐、二氢吡啶和二酮中的一种或多种的混合物。
7.一种如权利要求1-6中任意一项所述的耐高温收缩型保护膜的制备方法，其特征在于，包括以下步骤：
1)按照重量份分别称取内层和外层的原料、中间层的原料；
2)选用两台炼塑机，将步骤1)中的两种原料分别加入到两台炼塑机中，均在130-150℃的温度下塑炼4-5次；
3)将步骤2)中处理后的两种原料取出，通过三层共挤机挤出制得成品。
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