CN110395033A - 一种复合离型膜、丙烯酸酯纯胶膜及制备方法 - Google Patents

一种复合离型膜、丙烯酸酯纯胶膜及制备方法 Download PDF

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CN110395033A
CN110395033A CN201910672710.1A CN201910672710A CN110395033A CN 110395033 A CN110395033 A CN 110395033A CN 201910672710 A CN201910672710 A CN 201910672710A CN 110395033 A CN110395033 A CN 110395033A
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陈建平
张正浩
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Guangdong Dongyi New Mstar Technology Ltd
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Abstract

本发明提供了一种复合离型膜、丙烯酸酯纯胶膜及制备方法。该复合离型膜包括依次相连的聚酯光膜层、聚氨酯胶粘剂层以及双面淋膜纸层，复合离型膜的收缩率小，可以达到0.1～0.15％，丙烯酸酯胶膜包括复合离型膜层，以及依次设置于复合离型膜层上的丙烯酸酯胶粘剂层和聚丙烯膜层，将其应用于挠性线路板上，贴合厚度0.1mm以下的FR4板补强，不会有卷曲异常，同时丙烯酸酯胶膜的制备方法步骤简单，制备条件不苛刻，容易工业化生产。

Description

一种复合离型膜、丙烯酸酯纯胶膜及制备方法
技术领域
本发明属于柔性线路板技术领域，具体涉及一种复合离型膜、丙烯酸酯纯胶膜及制备方法。
背景技术
丙烯酸酯系胶黏剂是一类性能独特，应用广泛的胶黏剂。该类胶黏剂操作方便，固化速度快，可油面粘接，耐冲击、抗剥离，粘接性能优良，被粘材料广泛，可自粘与互粘。
丙烯酸酯胶膜以高粘着的丙烯酸酯系胶黏剂所制成，具有一定的厚度。丙烯酸酯胶膜是上下分别由一层保护膜及离型膜保护的三层复合结构材料，起表面绝缘、隔热保护等作用。该产品主要应用在FR4基板、FPC的热压合、补强PI、多层板贴合、软硬结合板及铝基金属板的粘接中。
FR4是一种耐燃材料等级的代号，所代表的意思是树脂材料经过燃烧状态必须能够自行熄灭的一种材料规格，它不是一种材料名称，而是一种材料等级，因此目前一般电路板所用的FR4等级材料就有非常多的种类，但是多数都是以所谓的四功能(Tera-Function)的环氧树脂加上填充剂(Filler)以及玻璃纤维所做出的复合材料。本申请中FR4基板指环氧玻纤布层压板。
FR4基板电绝缘性好、稳定、平整度好、表面光滑、无凹坑，适合应用于高性能电子绝缘要求的产品，如FPC补强板、PCB钻孔垫板、玻纤介子、电位器碳膜印刷玻璃纤维板、精密游星齿轮(晶片研磨)、精密测试板材、电气(电器)设备绝缘撑条隔板、绝缘垫板、变压器绝缘板、电机绝缘件、研磨齿轮、电子开关绝缘板等。
本申请发明人在实现本申请实施例的过程中，发现目前应用于丙烯酸酯纯胶膜的离型膜，基本都是由聚酯光膜和聚酯薄膜复合而成，将丙烯酸纯胶膜应用于挠性线路板的补强板贴合，随着自动化程度的提高，挠性线路板制作要求的物料要求越来越高，而这种离型膜制作的丙烯酸酯纯胶膜贴合0.1mm以下的FR4板容易卷曲，卷曲过大，无法满足制程要求。
发明内容
为解决现有技术中，丙烯酸酯纯胶膜贴合0.1mm以下的FR4板容易卷曲，卷曲过大，无法满足制程要求的问题，本发明实施例的目的之一首先提供了一种复合离型膜。本发明实施例目的之二提供了含有上述复合离型膜的丙烯酸酯胶膜。本发明实施例的目的之三提供了上述丙烯酸酯胶膜的制备方法。
为实现上述目的，本发明实施例采用以下技术方案：
一种复合离型膜，包括依次相连的聚酯光膜层、聚氨酯胶粘剂层以及双面淋膜纸层，所述复合离型膜的收缩率为0.1～0.15％。
现有技术中尚未使用0.1mm以下FR4，目前还没有遇到此问题。然而可以预见的是，随着自动化程度的提高，挠性线路板制作要求的物料要求越来越高，而这种离型膜制作的丙烯酸酯纯胶膜贴合0.1mm以下的FR4板容易卷曲，卷曲过大，无法满足制程要求。
优选地，所述聚酯光膜层的厚度为12～25μm。
优选地，所述聚酯光膜层具有第一表面和第二表面两个表面，所述第一表面的达因值为35～40，所述第二表面的达因值为48～54。
优选地，所述聚氨酯胶粘剂层的厚度为3～5μm。
优选地，所述双面淋膜纸层具有第一淋膜层和第二淋膜层。
优选地，所述第一淋膜层是聚乙烯层，所述第一淋膜层的重量是10～20g/m2。
优选地，所述第二淋膜层是聚乙烯层，所述第二淋膜层的重量是10～20g/m2。
一种丙烯酸酯胶膜，包括
上述的复合离型膜层，以及依次设置于所述复合离型膜层上的丙烯酸酯胶粘剂层和聚丙烯膜层。
丙烯酸酯胶膜的制备方法，步骤包括
S1：将聚氨酯胶粘剂湿涂于双面淋膜纸的第一淋膜层上，第一次干燥后形成聚氨酯胶粘剂层；
S2：将所述聚酯光膜层的第二表面与所述聚氨酯胶粘剂层压合收卷后固化，得到所述复合离型膜；
S3：将丙烯酸酯胶粘剂涂覆于所述复合离型膜中双面淋膜纸层的第二淋膜层上，第二次干燥后形成所述聚丙烯酸酯胶粘剂层；
S4：将所述聚丙烯膜层压合至所述聚丙烯酸酯胶粘剂层上，即得所述丙烯酸酯胶膜。
步骤S1中，第一次干燥的温度为50～80℃，第一次干燥的时间为50～100s。
步骤S2中，将聚酯光膜层的第二表面与聚氨酯胶粘剂层压合收卷的温度为50～100℃。
优选地，步骤S2所述固化的温度为40～70℃，固化的时间为24～72h，卷状固化。
步骤S3中第二次干燥的温度为50～100℃，干燥时间为100～200s。
步骤S4压合的温度为50～100℃。
本发明实施例的有益效果
1、本发明实施例提供了一种复合离型膜，该复合离型膜包括依次相连的聚酯光膜层、聚氨酯胶粘剂层以及双面淋膜纸层，复合离型膜的收缩率小，可以达到0.1～0.15％；
2、本发明实施例还提供了一种丙烯酸酯胶膜，该丙烯酸酯胶膜包括复合离型膜层，以及依次设置于复合离型膜层上的丙烯酸酯胶粘剂层和聚丙烯膜层，将其应用于挠性线路板上，贴合厚度0.1mm以下的FR4板补强，不会有卷曲异常；
3、本发明实施例还提供了丙烯酸酯胶膜的制备方法，该方法步骤简单，制备条件不苛刻，容易工业化生产。
附图说明
图1是复合离型膜结构示意图。
图2是复合离型膜结构拆分示意图。
图3是丙烯酸酯胶膜结构示意图。
具体实施方式
为解决现有技术中，丙烯酸酯纯胶膜贴合0.1mm以下的FR4板容易卷曲，卷曲过大，无法满足制程要求的问题，本发明实施例的目的之一首先提供了一种复合离型膜。本发明实施例目的之二提供了含有上述复合离型膜的丙烯酸酯胶膜。本发明实施例的目的之三提供了上述丙烯酸酯胶膜的制备方法。
为了更好的理解上述技术方案，下面将结合具体的实施方式对上述技术方案进行详细地说明。
实施例1
本例提供了一种复合离型膜，结构如图1所示，包括依次相连的聚酯光膜层10、聚氨酯胶粘剂层20以及双面淋膜纸层30，复合离型膜的收缩率为0.1～0.15％。
其中，聚酯光膜层10的厚度为12～25μm。
如图2所示，聚酯光膜层10具有第一表面110和第二表面两个表面120，第一表面110的达因值为35～40，第二表面120的达因值为48～54。
聚氨酯胶粘剂层20的厚度为3～5μm。
双面淋膜纸层30具有第一淋膜层310和第二淋膜层320。第一淋膜层310是聚乙烯层，第一淋膜层310的重量是10～20g/m2。第二淋膜层320是聚乙烯层，第二淋膜层320的重量是10～20g/m2。
实施例2
一种丙烯酸酯胶膜，如图3所示，包括
实施例1的复合离型膜层40，以及依次设置于复合离型膜层40上的丙烯酸酯胶粘剂层50和聚丙烯膜层60。
实施例3
丙烯酸酯胶膜的制备方法，步骤包括
S1：将聚氨酯胶粘剂湿涂于双面淋膜纸的第一淋膜层上，第一次干燥后形成聚氨酯胶粘剂层；
S2：将聚酯光膜层的第二表面与聚氨酯胶粘剂层压合收卷后固化，得到复合离型膜；
S3：将丙烯酸酯胶粘剂涂覆于复合离型膜中双面淋膜纸层的第二淋膜层上，第二次干燥后形成聚丙烯酸酯胶粘剂层；
S4：将聚丙烯膜层压合至聚丙烯酸酯胶粘剂层上，即得丙烯酸酯胶膜。
步骤S1中，第一次干燥的温度为50～80℃，第一次干燥的时间为50～100s。
步骤S2中，将聚酯光膜层的第二表面与聚氨酯胶粘剂层压合收卷的温度为50～100℃。
步骤S2固化的温度为40～70℃，固化的时间为24～72h，卷状固化。
步骤S3中第二次干燥的温度为50～100℃，干燥时间为100～200s。
步骤S4压合的温度为50～100℃。
检测例
根据实施例1～3提供的复合离型膜、丙烯酸酯纯胶膜及制备方法，本例制备了3种复合离型膜及4种对比样品，具体如表1所示。
表1 复合离型膜组分
使用上述复合离型膜和对比复合离型膜制作了对应编号的厚度35um的丙烯酸酯纯胶膜，测试贴合不同厚度FR4的卷曲状况，结果如表2所示。
表2 卷曲状况测试结果
卷曲测试方法：不同厚度的FR4板和丙烯酸酯纯胶膜裁切成250mm*250mm大小，将丙烯酸酯纯胶膜的聚丙烯膜撕开，丙烯酸酯纯胶膜胶面与FR4板对齐，用覆背机120℃*5格条件下贴合。室温(25±5℃)放置不同时间测试卷曲性能。

Claims (10)

1.一种复合离型膜，其特征在于，包括依次相连的聚酯光膜层、聚氨酯胶粘剂层以及双面淋膜纸层，所述复合离型膜的收缩率为0.1～0.15％。
2.根据权利要求1所述的复合离型膜，其特征在于，所述聚酯光膜层的厚度为12～25μm。
3.根据权利要求1所述的复合离型膜，其特征在于，所述聚酯光膜层具有第一表面和第二表面两个表面，所述第一表面的达因值为35～40，所述第二表面的达因值为48～54。
4.根据权利要求1所述的复合离型膜，其特征在于，所述聚氨酯胶粘剂层的厚度为3～5μm。
5.根据权利要求1所述的复合离型膜，其特征在于，所述双面淋膜纸层具有第一淋膜层和第二淋膜层。
6.根据权利要求1所述的复合离型膜，其特征在于，所述第一淋膜层是聚乙烯层，所述第一淋膜层的重量是10～20g/m2。
7.根据权利要求1所述的复合离型膜，其特征在于，所述第二淋膜层是聚乙烯层，所述第二淋膜层的重量是10～20g/m2。
8.一种丙烯酸酯胶膜，其特征在于，包括
如权利要求1～7任一项所述的复合离型膜层，以及依次设置于所述复合离型膜层上的丙烯酸酯胶粘剂层和聚丙烯膜层。
9.根据权利要求8所述丙烯酸酯胶膜的制备方法，其特征在于，步骤包括
S1：将聚氨酯胶粘剂湿涂于双面淋膜纸的第一淋膜层上，第一次干燥后形成聚氨酯胶粘剂层；
S2：将所述聚酯光膜层的第二表面与所述聚氨酯胶粘剂层压合收卷后固化，得到所述复合离型膜；
S3：将丙烯酸酯胶粘剂涂覆于所述复合离型膜中双面淋膜纸层的第二淋膜层上，第二次干燥后形成所述聚丙烯酸酯胶粘剂层；
S4：将所述聚丙烯膜层压合至所述聚丙烯酸酯胶粘剂层上，即得所述丙烯酸酯胶膜。
10.根据权利要求9所述丙烯酸酯胶膜的制备方法，其特征在于，步骤S2所述固化的温度为40～70℃。
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