CN113752656A - 一种耐冷冻多层薄膜 - Google Patents
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Abstract
本发明提供了一种耐冷冻多层薄膜，其包括若干重复相叠的热封层，若干重复相叠的结构层以及若干重复相叠的表层，所述结构层与结构层之间、结构层与热封层之间，结构层与表层之间分别设有粘接层，所述热封层、结构层，表层内分别包含若干材料及材料层，所述表层包括聚丙烯与聚烯烃共聚物的共混物；耐冷冻多层薄膜的表层包含有聚丙烯，提高了该薄膜的刚性以及拉伸成型性，并具有优秀的外观，表层包括聚丙烯与聚烯烃共聚物的共混物，玻璃化转变点温度较低，克服了聚丙烯的玻璃化转变点高于0℃，通常不能被用于耐超低温薄膜的难题。
Description
技术领域
本发明涉及食品包装膜领域，特别是涉及一种用于食品包装的多层共挤出薄膜。
背景技术
可热拉伸成型的多层共挤出薄膜被广泛的用于食品包装，在食品的拉伸包装工艺中，用作下膜的薄膜被预热到80℃-120℃，在真空作用下被拉伸为模具的形状；在成型为袋型的下膜中放入待包装的食品，包装内抽真空后，下膜与上膜热封形成一个完整的食品包装。
用于拉伸膜下膜的薄膜通常由聚乙烯，聚丙烯，尼龙，粘接树脂，以及阻隔性树脂通过吹膜或者流延多层共挤出工艺生产。这种薄膜具有阻隔性，可拉伸性，以及良好的外观等特点。
现有技术中存在的问题在于，通常承受-40℃超低温的薄膜采用聚乙烯或者弹性体来提高低温韧性，但是这导致薄膜的刚性降低，拉伸成型性变差。而且聚丙烯的玻璃化转变点高于0℃，聚丙烯层通常不被使用于这类耐超低温薄膜。
发明内容
鉴于以上所述现有技术中存在的问题，本发明的目的在于提供一种在-40℃超低温条件下，具有优秀刚性，拉伸成型性和外观的耐冷冻多层薄膜。
为实现上述目的，本发明提供了一种耐冷冻多层薄膜，其包括若干重复相叠的热封层，若干重复相叠的结构层以及若干重复相叠的表层，所述结构层与结构层之间、结构层与热封层之间，结构层与表层之间分别设有粘接层，所述热封层、结构层，表层内分别包含若干材料及材料层，所述表层包括聚丙烯与聚烯烃共聚物的共混物。
进一步地，所述表层包括聚丙烯与聚烯烃共聚物的共混物层。
优选地，所述聚烯烃共聚物包括2中材料的共混物。
优选地，所述聚烯烃共聚物为乙烯/α-烯烃共聚物，丙烯/乙烯/α-烯烃共聚物或这两种材料的共混物。
进一步地，所述粘接层为粘接树脂。
进一步地，所述热封层厚度占耐冷冻多层薄膜厚度的5％-15％。
优选地，所述热封层的层数为2层。
优选地，所述结构层的层数为2层。
进一步地，所述热封层包括茂金属聚乙烯层。
优选地，所述结构层包括共聚尼龙层。
本发明的优点和有益效果在于：
本发明提供了一种耐冷冻多层薄膜，耐冷冻多层薄膜的表层包含有聚丙烯，提高了该薄膜的刚性以及拉伸成型性，并因低的雾度具有优秀的外观，表层包括聚丙烯与聚烯烃共聚物的共混物，玻璃化转变点温度较低，克服了聚丙烯的玻璃化转变点高于0℃，通常不能被用于耐超低温薄膜的难题。
具体实施方式
以下由特定的具体实施例说明本发明的实施方式，熟悉此技术的人士可由本说明书所揭露的内容轻易地了解本发明的其他优点及功效。
本发明涉及一种耐冷冻多层薄膜，采用多层流延共挤出的方法制备，即各层材料经过挤出机熔融后，经流体分配器分层分流，在摸头延展成所需宽度的熔体流，经过拉伸，水冷，牵引，收卷，分切后制备成流延薄膜。
热封层厚度占耐冷冻多层薄膜厚度的5％-15％。
实施例1.一种耐冷冻多层薄膜
采用结构为：茂金属聚乙烯、茂金属聚乙烯、粘接树脂、共聚尼龙、粘接树脂、共聚尼龙、粘接树脂、茂金属聚乙烯、聚丙烯/(乙烯/α-烯烃共聚物)的共混物。
实施例2.一种耐冷冻多层薄膜
采用结构为：茂金属聚乙烯、茂金属聚乙烯、粘接树脂、共聚尼龙、粘接树脂、共聚尼龙、粘接树脂、聚丙烯/(乙烯/α-烯烃共聚物)的共混物。
实施例3.一种耐冷冻多层薄膜
采用结构为：茂金属聚乙烯、茂金属聚乙烯、粘接树脂、共聚尼龙、粘接树脂、共聚尼龙、粘接树脂、茂金属聚乙烯、聚丙烯/(丙烯/乙烯/α-烯烃共聚物)的共混物。
实施例4.一种耐冷冻多层薄膜
采用结构为：茂金属聚乙烯、茂金属聚乙烯、粘接树脂、共聚尼龙、粘接树脂、共聚尼龙、粘接树脂、聚丙烯/(丙烯/乙烯/α-烯烃共聚物)的共混物。
实施例5.一种耐冷冻多层薄膜
采用结构为：茂金属聚乙烯、茂金属聚乙烯、粘接树脂、共聚尼龙、粘接树脂、共聚尼龙、粘接树脂、聚丙烯/(乙烯/α-烯烃共聚物与丙烯/乙烯/α-烯烃共聚物的共混物)的共混物。
实施例6.一种耐冷冻多层薄膜
采用结构为：茂金属聚乙烯、茂金属聚乙烯、粘接树脂、共聚尼龙、粘接树脂、共聚尼龙、粘接树脂、茂金属聚乙烯、聚丙烯/(乙烯/α-烯烃共聚物与丙烯/乙烯/α-烯烃共聚物的共混物)的共混物。
实施例分别采用聚丙烯/烯烃共聚物的共混物作为耐冷冻多层薄膜的表层，还采用了茂金属乙烯，聚丙烯/烯烃共聚物的共混物两者共同作为耐冷冻多层薄膜的表层，此类共混物的玻璃化转变点温度较低，且在-40℃超低温条件下具有优秀的刚性，拉伸成形性以及外观。
对比例1：采用薄膜结构为：茂金属聚乙烯、粘接树脂、尼龙6/无定形尼龙的共混物、粘接树脂、尼龙6/无定形尼龙的共混物、粘接树脂、聚丙烯。
对比例2：采用薄膜结构为：茂金属聚乙烯、粘接树脂、尼龙6/无定形尼龙的共混物、粘接树脂、尼龙6/无定形尼龙的共混物、粘接树脂、尼龙6。
对比例3：采用薄膜结构为：茂金属聚乙烯、粘接树脂、共聚尼龙、粘接树脂、共聚尼龙、粘接树脂、茂金属聚乙烯。
对比例4：采用薄膜结构为：茂金属聚乙烯、粘接树脂、共聚尼龙、粘接树脂、共聚尼龙、粘接树脂、茂金属聚乙烯、乙烯-丙烯嵌段共聚物。
对比例5：采用薄膜结构为：茂金属聚乙烯、粘接树脂、共聚尼龙、粘接树脂、共聚尼龙、粘接树脂、茂金属聚乙烯、聚丙烯。
对比例6：采用薄膜结构为：茂金属聚乙烯、粘接树脂、共聚尼龙、粘接树脂、共聚尼龙、粘接树脂、聚丙烯/茂金属聚乙烯的共混物。
对比例分别采用聚丙烯、尼龙6、茂金属乙烯、两层分别是茂金属乙烯与乙烯-丙烯嵌段共聚物、两层分别是茂金属聚乙烯与聚丙烯，聚丙烯/茂金属聚乙烯的共混物作为薄膜的表层，而-40℃的超低温条件会导致薄膜的刚性降低，拉伸成型性变差。
经过测试实施例2以及对比例3的拉伸强度、雾度、-20℃冲击强度，-40℃冲击强度得到下表：
分析后，可知实施例2比对比例3的拉伸强度提高30％，雾度降低30％，冲击强度为衡量材料韧性的一种指标，-20℃下冲击强度提高17％，-40℃下冲击强度提高3％，证实了实施例与对比例相比具有优秀的刚性以及拉伸成型性，并因低的雾度具有优秀的外观的特点。
本发明提供了一种耐冷冻多层薄膜，耐冷冻多层薄膜的表层包含有聚丙烯，提高了该薄膜的刚性以及拉伸成型性，并具有优秀的外观，表层包括聚丙烯与聚烯烃共聚物的共混物，玻璃化转变点温度较低，克服了聚丙烯的玻璃化转变点高于0℃，通常不能被用于耐超低温薄膜的困难。
综上所述，本发明有效克服了现有技术中的种种缺点而具高度产业利用价值。
上述实施例仅例示性说明本发明的原理及其功效，而非用于限制本发明。任何熟悉此技术的人士皆可在不违背本发明的精神及范畴下，对上述实施例进行修饰或改变。因此，举凡所属技术领域中具有通常知识者在未脱离本发明所揭示的精神与技术思想下所完成的一切等效修饰或改变，仍应由本发明的权利要求所涵盖。
Claims (10)
1.一种耐冷冻多层薄膜，其包括若干重复相叠的热封层，若干重复相叠的结构层以及若干重复相叠的表层，所述结构层与结构层之间、结构层与热封层之间，结构层与表层之间分别设有粘接层，所述热封层、结构层，表层内分别包含若干材料及材料层，其特征在于，所述表层包括聚丙烯与聚烯烃共聚物的共混物。
2.根据权利要求1所述的耐冷冻多层薄膜，其特征在于，所述表层包括聚丙烯与聚烯烃共聚物的共混物层。
3.根据权利要求2所述的耐冷冻多层薄膜，其特征在于，所述聚烯烃共聚物包括2种材料的共混物。
4.根据权利要求3所述的耐冷冻多层薄膜，其特征在于，所述聚烯烃共聚物为乙烯/α-烯烃共聚物，丙烯/乙烯/α-烯烃共聚物或这两种材料的共混物。
5.根据权利要求1所述的耐冷冻多层薄膜，其特征在于，所述粘接层为粘接树脂。
6.根据权利要求1所述的耐冷冻多层薄膜，其特征在于，所述热封层厚度占耐冷冻多层薄膜厚度的5％-15％。
7.根据权利要求1所述的耐冷冻多层薄膜，其特征在于，所述热封层的层数为2层。
8.根据权利要求1所述的耐冷冻多层薄膜，其特征在于，所述结构层的层数为2层。
9.根据权利要求1所述的耐冷冻多层薄膜，其特征在于，所述热封层包括茂金属聚乙烯层。
10.根据权利要求1所述的耐冷冻多层薄膜，其特征在于，所述结构层包括共聚尼龙层。
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