CN108329882B - 抑制opp和vmpet复合膜镀铝转移用水性环保型胶黏剂 - Google Patents

抑制opp和vmpet复合膜镀铝转移用水性环保型胶黏剂 Download PDF

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CN108329882B
CN108329882B CN201711486530.1A CN201711486530A CN108329882B CN 108329882 B CN108329882 B CN 108329882B CN 201711486530 A CN201711486530 A CN 201711486530A CN 108329882 B CN108329882 B CN 108329882B
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董海普
李珊
胡小毅
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Shanghai Weikai Optoelectronic New Materials Co Ltd
Shanghai Chengying New Material Co Ltd
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Abstract

本发明提供了一种抑制OPP/VMPET复合膜镀铝转移用水性胶黏剂，包括以下重量份数的各组分：羟基丙烯酸树脂25‑35；聚酯多元醇5‑12；聚乳酸6‑7.5；乙二胺封闭型聚乙烯亚胺0.3‑0.9；封闭型异氰酸酯固化剂1.8‑3；丙三醇2‑5；润湿剂0.08‑0.15；消泡剂0.1‑0.3；防腐剂0.03‑0.10；水40‑60。本发明制备的胶黏剂可应用于常规PET膜，镀铝转移面积0％，大大拓展了高功能产品的应用，且降低了之前需要用增强型PET膜所带来的附加成本。且该胶黏剂具有高剥离强度，可耐水煮和蒸煮，透明度高，水性环保、低VOC残留，总残留量<1mg，符合食品卫生要求。

Description

抑制OPP和VMPET复合膜镀铝转移用水性环保型胶黏剂
技术领域
本发明涉及胶黏剂技术领域，具体涉及一种抑制OPP和VMPET复合膜镀铝转移用水性环保型胶黏剂。
背景技术
胶黏剂作为不同基材间的复合介质，广泛应用于食品软包装领域。通过对不同功能特性的基材进行复合，使其达到兼顾多种性能要求。OPP/VMPET/PE是食品软包装常规的三层结构，外层OPP主要提供印图案，中间层VMPET(镀铝PET膜)提供光泽性和阻隔性，内层PE提供热封性能。对于普通应用而言，一般溶剂型胶水和水性胶水就能满足剥离强度的要求，但对于需要水煮和蒸煮的产品而言，在高压煮后，镀铝层很容易从PET膜上脱落，影响整体的强度和密封性能。目前溶剂型胶水100％会有镀铝转移，水性胶水镀铝转移面积亦达到80％，市面上大都采用增强型PET来解决此类问题。但此类增强型PET成本较高，而且需要在线电晕，工序麻烦，且有时效性，随着时间的延迟，电晕效果会越来越弱。
专利201610607907.3开发了一种应用于塑塑复合可高温蒸煮水性双组份胶黏剂，其优势在于具有很高的剥离强度，可满足绝大部分水煮和蒸煮要求，其劣势在于只适用于塑塑复合，对于OPP/VMPET这种镀铝结构的复合，虽然有很高的剥离强度，但仍然会有镀铝转移现象，且镀铝转移面积高达60％。因此，急需开发一种可抑制OPP/VMPET复合膜镀铝转移用胶黏剂。
发明内容
针对现有技术中的缺陷，本发明提供了一种抑制OPP和VMPET复合膜镀铝转移用水性环保型胶黏剂。
本发明的目的是通过以下技术方案实现的：
本发明提供了一种抑制OPP/VMPET复合膜镀铝转移用水性胶黏剂，包括以下重量份数的各组分：
Figure BDA0001534866950000021
优选地，所述抑制OPP/VMPET复合膜镀铝转移用水性胶黏剂，包括以下重量份数的各组分：
Figure BDA0001534866950000022
优选地，所述羟基丙烯酸的羟基含量为1.5～2.6wt％，粘度为300-3000mPa·s，PH值为7.0-8.5，最低成膜温度为35-40℃。
优选地，所述聚酯多元醇的数均分子量为1000-1500，羟值为360～400mgKOH/g，酸值≤2.0mgKOH/g，粘度≤4000mPa·s。
优选地，所述聚乳酸为L-PLA，数均分子量为100000-150000，玻璃化转变温度45-55℃。
优选地，所述乙二胺封闭型聚乙烯亚胺的伯胺封端比率大于80％，数均分子量为600-800。优选上海超研Macklin。
优选地，所述封闭型异氰酸酯固化剂的NCO含量为6-7wt％，粘度为250mPa·s，采用的溶剂为异丙醇和正丁醇，端基解封温度为90-95℃。优选旭化成MF-K60X。
优选地，所述丙三醇的纯度>98％。
优选地，所述防腐剂为凯松DL702，为一种高效、广谱绿色防腐剂。
优选地，所述湿润剂为TEGO Glide 110；所述消泡剂为TEGO Foamex 825。
本发明还提供了一种抑制OPP/VMPET复合膜镀铝转移用水性胶黏剂的制备方法，包括以下步骤：
S1，按重量份数取各组分；
S2，取羟基丙烯酸树脂，聚酯多元醇，聚乳酸，加入水中，之后放入反应釜中，搅拌；
S3，向反应釜中加入固化剂乙二胺封闭型聚乙烯亚胺，封闭型异氰酸酯固化剂及丙三醇,搅拌；
S4，向反应釜中依次加入润湿剂、消泡剂及防腐剂，搅拌，即得所述组合物。
优选地，步骤S2和S3中，所述搅拌的转速为300～500rpm,搅拌时间为10分钟。
优选地，步骤S4中，所述搅拌的转速为800-1200rpm，搅拌时间为30分钟。
现有技术相比，本发明具有如下的有益效果：
(1)本发明制备的抑制OPP/VMPET复合膜镀铝转移用水性胶黏剂，可应用于常规PET膜，镀铝转移面积0％，大大拓展了高功能产品的应用，且降低了之前需要用增强型PET膜所带来的附加成本。
(2)本发明制备的水性胶黏剂具有高剥离强度，可耐水煮和蒸煮，透明度高，水性环保、低VOC残留，总残留量<1mg，符合食品卫生要求。
(3)本发明制备的水性胶黏剂对常规VMPET不产生镀铝转移现象，可实现常规VMPET条件下的水煮、蒸煮要求；且OPP/VMPET层间复合强度高，>3.5N；对OPP印刷层不会产生溶墨现象。
具体实施方式
下面结合具体实施例对本发明进行详细说明。以下实施例将有助于本领域的技术人员进一步理解本发明，但不以任何形式限制本发明。应当指出的是，对本领域的普通技术人员来说，在不脱离本发明构思的前提下，还可以做出若干变形和改进。这些都属于本发明的保护范围。
实施例1-5
本实施例1-5提供了一种抑制OPP/VMPET复合膜镀铝转移用水性胶黏剂，所述水性胶黏剂的各组分及重量份数如表1所示。
所述制备方法具体为：
表1
组分 实施例1 实施例2 实施例3 实施例4 实施例5
羟基丙烯酸 26.0 26 30.0 27.0 32
聚酯多元醇 8.0 10.0 5.0 7.0 5.0
聚乳酸 7.0 7.5 6.0 7.2 6.0
乙二胺封闭型聚乙烯亚胺 0.6 0.4 0.5 0.7 0.8
封闭型异氰酸酯固化剂 2.0 1.8 2.5 2.7 3
丙三醇 5.0 3.5 4.5 4.0 3.0
润湿剂 0.11 0.09 0.09 0.10 0.11
消泡剂 0.17 0.15 0.13 0.16 0.10
防腐剂 0.1 0.08 0.06 0.05 0.04
水 52 53 52 53 51
对比例1：陶氏溶剂型胶水ADCOTE 502S/固化剂F，涂布干量3.0g/m2。
对比例2：陶氏水性胶水ROBOND L-95D，涂布干量3.0g/m2。
测试结果：
将本发明各实施例和对比例制备的胶黏剂进行性能测试，测试方法为：将各胶黏剂进行涂布，涂布干量为3.0g/m2。测试方法：先涂布在WMPET上，然后100℃烘干20s，再复合OPP膜，过塑封机复合，复合后再烘箱温度45℃熟化48h,用拉伸仪测强度，并观察镀铝与油墨转移情况。
测试结果如表2所示。
表2
Figure BDA0001534866950000041
Figure BDA0001534866950000051
综上所述，本发明主要通过以下原理来抑制OPP复合VMPET过程中镀铝层从PET膜上脱层。乙二胺封端的聚乙烯亚胺在高温环境中会解封成聚乙烯亚胺，聚乙烯亚胺会渗透通过铝层到达PET表面，与PET上极性基团反应，另一方面，聚乳酸具有一定刚性，能够嵌在聚氨酯涂层中，且聚乳酸上的羧基官能团亦会与聚乙烯亚胺反应，因此，聚乙烯亚胺相当于一个桥梁，能牢牢链接胶水层和PET膜表面，抑制镀铝转移，即镀铝层从PET表面脱落。但是，因为聚乳酸具有一定刚性，因此，聚乳酸的添加量不宜过高，当聚乳酸含量过高时，会影响聚氨酯的成膜性、柔韧性，胶水成膜后整体刚性越强，镀铝层越容易脱层，因此，聚乳酸的添加量尽量控制在6％-7.5％。
本发明具体应用途径很多，以上所述仅是本发明的优选实施方式。应当指出，以上实施例仅用于说明本发明，而并不用于限制本发明的保护范围。对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以做出若干改进，这些改进也应视为本发明的保护范围。

Claims (10)

1.一种抑制OPP/VMPET复合膜镀铝转移用水性胶黏剂，其特征在于，包括以下重量份数的各组分：
Figure FDA0002583746760000011
2.根据权利要求1所述的抑制OPP/VMPET复合膜镀铝转移用水性胶黏剂，其特征在于，所述羟基丙烯酸树脂的羟基含量为1.5～2.6wt％，粘度为300-3000mPa·s，pH 值为7.0-8.5，最低成膜温度为35-40℃。
3.根据权利要求1所述的抑制OPP/VMPET复合膜镀铝转移用水性胶黏剂，其特征在于，所述聚酯多元醇的数均分子量为1000-1500，羟值为360～400mgKOH/g，酸值≤2.0mgKOH/g，粘度≤4000mPa·s。
4.根据权利要求1所述的抑制OPP/VMPET复合膜镀铝转移用水性胶黏剂，其特征在于，所述聚乳酸为L-PLA，数均分子量为100000-150000，玻璃化转变温度45-55℃。
5.根据权利要求1所述的抑制OPP/VMPET复合膜镀铝转移用水性胶黏剂，其特征在于，所述乙二胺封闭型聚乙烯亚胺的伯胺封端比率大于80％，数均分子量为600-800。
6.根据权利要求1所述的抑制OPP/VMPET复合膜镀铝转移用水性胶黏剂，其特征在于，所述封闭型异氰酸酯固化剂的NCO含量为6-7wt％，粘度为250mPa·s，采用的溶剂为异丙醇和正丁醇，端基解封温度为90-95℃。
7.根据权利要求1所述的抑制OPP/VMPET复合膜镀铝转移用水性胶黏剂，其特征在于，所述丙三醇的纯度>98％。
8.根据权利要求1所述的抑制OPP/VMPET复合膜镀铝转移用水性胶黏剂，其特征在于，所述防腐剂为凯松DL702。
9.根据权利要求1所述的抑制OPP/VMPET复合膜镀铝转移用水性胶黏剂，其特征在于，所述湿润剂为TEGO Glide 110；所述消泡剂为TEGO Foamex 825。
10.一种根据权利要求1-9任一项所述的抑制OPP/VMPET复合膜镀铝转移用水性胶黏剂的制备方法，其特征在于，包括以下步骤：
S1，按重量份数取各组分；
S2，取羟基丙烯酸树脂，聚酯多元醇，聚乳酸，加入水中，之后放入反应釜中，搅拌；
S3，向反应釜中加入固化剂乙二胺封闭型聚乙烯亚胺，封闭型异氰酸酯固化剂及丙三醇,搅拌；
S4，向反应釜中依次加入润湿剂、消泡剂及防腐剂，搅拌，即得所述组合物。
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