CN111748296A - 一种用于基材表面的热覆合膜 - Google Patents

一种用于基材表面的热覆合膜 Download PDF

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CN111748296A
CN111748296A CN202010689001.7A CN202010689001A CN111748296A CN 111748296 A CN111748296 A CN 111748296A CN 202010689001 A CN202010689001 A CN 202010689001A CN 111748296 A CN111748296 A CN 111748296A
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李玉成
龚学良
贺志华
李晓智
李晓睿
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HUIZHOU YIDU STATIONERY SUPPLIES CO Ltd
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Abstract

本发明涉及化工技术领域，尤其涉及一种用于基材表面的热覆合膜。它包括PET聚对苯二甲酸类塑料膜层，所述PET聚对苯二甲酸类塑料膜层表面设有粘接层，所述的粘接层由内向外是附着力涂层和热粘合涂层，所述的热粘合涂层的重量百分组成为EVA醋酸乙烯酯57～70％、EVA醋酸乙烯酯接枝马来酸酐10～20％、乙烯丙烯酸10～20％、乙烯丙烯酸甲酯10～20％、丙二醇甲醚醋酸酯6～12％、助剂0.5～1.5％，各组份之和为100％。本发明的用于基材表面的热覆合膜具有优异的粘接力。其生产工艺非常简单，生产和使用环保。

Description

一种用于基材表面的热覆合膜
技术领域
本发明技术涉及化工技术领域，尤其涉及一种用于基材表面的热覆合膜。
背景技术
现有的用于基材表面的热覆合膜是将聚酯(PET)膜或双向拉伸聚丙烯膜(BOPP膜)作为基底层，其上形成底漆层，在底漆层上将树脂单螺杆挤压或共挤压成1层或2层以形成粘胶层。作为胶粘剂使用了以高含量包含醋酸乙烯酯单位的乙烯－醋酸乙烯酯共聚物(EVA)或乙烯－丙烯酸乙酯(EEA)等乙烯和α－烯烃的共聚物。然而，这些产品与用水性油墨印刷的印刷层的粘接性并不令人满意。此外，在形成粘接层时，存在需要在180℃～270℃的高温下挤压涂覆的问题以及用于形成粘接层的材料昂贵的问题。
现有的建筑或生活用基材包括大量的塑胶基材、木质基材以及金属基材，为了防止基材的表面刮化及耐酸碱性等，往往在基材的表面涂上涂料，但涂料的气味重，且防止基材的表面刮化及耐酸碱性能都一般。或者使用PET涂PUR与木材表面覆合，但是容易产生气泡或起皱，影响美观且PUR价格昂贵。另外，为了方便购物，便携式提拉带的使用越来越广泛，便携式提拉带一般由塑料片、无防布等组成，但这种提拉带承重效果差，很容易断裂。
发明内容
针对上述技术问题，本发明提供一种粘性好、生产成本低、环保性好、使用广泛的热覆合膜。
为解决上述技术问题，本发明提供的技术方案是：一种用于基材表面的热覆合膜，包括PET聚对苯二甲酸类塑料膜层，所述PET聚对苯二甲酸类塑料膜层表面设有粘接层，所述的粘接层由内向外是附着力涂层和热粘合涂层，所述的热粘合涂层的重量百分组成为EVA醋酸乙烯酯57～70％、EVA醋酸乙烯酯接枝马来酸酐10～20％、乙烯丙烯酸10～20％、乙烯丙烯酸甲酯10～20％、丙二醇甲醚醋酸酯6～12％、助剂0.5～1.5％，各组份之和为100％。
进一步：在上述用于基材表面的热覆合膜中，优选的，所述的热粘合涂层的重量百分组成为EVA醋酸乙烯酯61～69％、EVA醋酸乙烯酯接枝马来酸酐10～15％、乙烯丙烯酸10～13％、乙烯丙烯酸甲酯2.0～2.3％％、丙二醇甲醚醋酸酯8～10％、助剂0.5～1.5％，各组份之和为100％。
所述的附着力涂层是聚乙烯亚胺层，即聚乙烯亚胺水性溶剂涂布在达因值大于48的PET表面，经过40－120℃的隧道烘箱彻底干燥，聚乙烯亚胺的表面干量为0.05－0.3g/㎡。
所述助剂是高分子量纳米级颗粒的有机硅改性聚合物。
所述的热覆合膜的表面分正反两面，所述的正面经紫外光光固化涂层处理为光面的水晶硬化涂层，这是本领域技术人员常用的技术；所述的反面表面设有粘接层。
或者：所述的热覆合膜的表面分正反两面，所述的正面和反面表面均设有粘接层。
上述热覆合膜的粘接层粘接到基材表面一般通过热熔合的方式粘在基材表面，其热熔合的温度为120度以上，针对不同的基材材质，这个温度有所调整，热熔合的温度也是本领域技术人员熟知且常用的技术。
再进一步：在上述用于基材表面的热覆合膜中，所述基PET聚对苯二甲酸类塑料膜层厚度为100－500微米。
本发明还提供了一种便携式提拉带，包括本发明的热覆合膜单面或者正反两面通过热熔合方式粘合有无防布层，所述的热熔合温度为130±10度。所述的无防布层上印有图案或者商标标识。这样的便携式提拉带特别适用于箱装的各种饮料、牛奶和矿泉水。其韧性和承重性能都特别强。
与现有技术相比，本发明包括PET聚对苯二甲酸类塑料膜层，所述PET聚对苯二甲酸类塑料膜层表面设有粘接层，所述的粘接层由内向外是附着力涂层和热粘合涂层，所述的热粘合涂层的重量百分组成为EVA醋酸乙烯酯57～70％、EVA醋酸乙烯酯接枝马来酸酐10～20％、乙烯丙烯酸10～20％、乙烯丙烯酸甲酯10～20％、丙二醇甲醚醋酸酯6～12％、助剂0.5～1.5％，各组份之和为100％。各物质的配比和选择都是反复试验，尤其是EVA醋酸乙烯酯和EVA醋酸乙烯酯接枝马来酸酐的选择，量大或量少都不能达到好的透明度和粘接效果；马来酸酐的选择使得基材表面的硬颗粒，尤其是金属粒子熔合，适量的EVA醋酸乙烯酯接枝马来酸酐将大大增加基材表面的粘合效果。所以本发明的技术效果如下：
1)本发明的用于基材表面的热覆合膜具有优异的粘接力。
2)根据本发明的粘胶层在干燥后没有粘性，当卷取用于基材表面的热覆合膜时，粘胶层与基底层的外表面(没有形成粘胶层的一侧表面)不会出现相互粘接的现象。如果卷取时发生粘接，则难以将卷取状态的用于基材表面的热覆合膜开卷(unwinding)，或者在开卷的过程中发生用于基材表面的热覆合膜被扯断的问题。
3)本发明的粘接层在热覆后透明度优异。当使用半透明基底层时，根据本发明的粘接层也不会对基材层的透明度产生不良影响。
4)本发明的粘接层不含苯，生产和使用环保。
具体实施方式
下面结合实施例对本发明进一步的说明。
一种用于基材表面的热覆合膜，包括PET聚对苯二甲酸类塑料膜层，所述PET聚对苯二甲酸类塑料膜层表面设有粘接层，所述的粘接层由内向外是附着力涂层和热粘合涂层，所述的热粘合涂层的重量百分组成如表1所示：
表1：各实施例的配方组成
Figure BDA0002587589580000041
将上述实施例配方所得的热覆合膜，热熔合到基材表面(热熔合温度120度以上)，按照《GB/T2791——1995胶粘剂T剥离强度的试验方法》，得出的实验数据如表2所示：
表2：拉力测试数据
Figure BDA0002587589580000042
Figure BDA0002587589580000051
从上述实验数据得出，本发明的用于基材表面的热覆合膜具有优异的粘接力。且粘接层不含苯，生产和使用环保。
本发明并不限于上述实施例。在本领域普通技术人员所具备的知识范围内，还可以在不脱离本发明宗旨的前提下做出各种变化，皆属于本发明的保护范围。

Claims (9)

1.一种用于基材表面的热覆合膜，包括PET聚对苯二甲酸类塑料膜层，所述PET聚对苯二甲酸类塑料膜层表面设有粘接层，其特征在于：所述的粘接层由内向外是附着力涂层和热粘合涂层，所述的热粘合涂层的重量百分组成为EVA醋酸乙烯酯57～70％、EVA醋酸乙烯酯接枝马来酸酐10～20％、乙烯丙烯酸10～20％、乙烯丙烯酸甲酯10～20％、丙二醇甲醚醋酸酯6～12％、助剂0.5～1.5％，各组份之和为100％。
2.根据权利要求1所述的用于基材表面的热覆合膜，其特征在于：所述的热粘合涂层的重量百分组成为EVA醋酸乙烯酯61～69％、EVA醋酸乙烯酯接枝马来酸酐10～15％、乙烯丙烯酸10～13％、乙烯丙烯酸甲酯2.0～2.3％％、丙二醇甲醚醋酸酯8～10％、助剂0.5～1.5％，各组份之和为100％。
3.根据权利要求1所述的用于基材表面的热覆合膜，其特征在于：所述的附着力涂层是由聚乙烯亚胺水性溶剂涂布在PET表面，经过40－120℃的隧道烘箱彻底干燥而得。
4.根据权利要求3所述的用于基材表面的热覆合膜，其特征在于：所述助剂是高分子量纳米级颗粒的有机硅改性聚合物。
5.根据权利要求4所述的用于基材表面的热覆合膜，其特征在于：所述的热覆合膜的表面分正反两面，所述的正面经紫外光光固化涂层处理为光面的水晶硬化涂层；所述的反面表面设有粘接层。
6.根据权利要求4所述的用于基材表面的热覆合膜，其特征在于：所述的热覆合膜的表面分正反两面，所述的正面和反面表面均设有粘接层。
7.根据权利要求1－6中任意一项所述的用于基材表面的热覆合膜，其特征在于：所述基PET聚对苯二甲酸类塑料膜层厚度为100－500微米。
8.一种便携式提拉带，包括权利要求1－6中任意一项所述的热覆合膜，所述的热覆合膜单面或者正反两面通过热熔合方式粘合有无防布层，所述的热熔合温度为130±10度。
9.根据权利要求8所述的便携式提拉带，其特征在于：所述的无防布层上印有图案或者商标标识。
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