CN107718916B - 一种应用于柔性线路板的压敏胶的印刷制备工艺 - Google Patents

一种应用于柔性线路板的压敏胶的印刷制备工艺 Download PDF

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CN107718916B
CN107718916B CN201710893690.1A CN201710893690A CN107718916B CN 107718916 B CN107718916 B CN 107718916B CN 201710893690 A CN201710893690 A CN 201710893690A CN 107718916 B CN107718916 B CN 107718916B
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陈钦
罗登俊
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Suzhou Eunow Electronic Material Technology Co ltd
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Abstract

本发明公开了一种应用于柔性线路板的压敏胶的印刷制备工艺。关键是印刷制备工艺步骤如下:a.在柔性线路板的特定位置设置开孔图案;b.将压敏胶水在上述的开孔图案上涂布;c.对上述的压敏胶水图案做初步固化。本发明不使用离型膜,有效地降低了成本,减少浪费,实现自动化作业。

Description

一种应用于柔性线路板的压敏胶的印刷制备工艺
技术领域:
本发明涉及一种在线路板上涂布压敏胶的印刷工艺方法,特别是指一种在柔性线路板(FPC)上涂布压敏胶的印刷制备工艺。
背景技术:
在电子等技术领域,印刷线路板是必须使用的承载电子元件的载体,随着技术的进步,小型电器如手机等普遍使用柔性线路板(FPC)作为一些连接部件或承载体,在组装过程中需要将其粘接附着与其它框架基础部件上。目前几乎所有的制程工序都是将双面胶带(预成型压敏胶)模切成所需要的形状,然后手工将其贴合在待粘接处,最后再粘接使用。在这个过程中,需要对双面胶带进行模切,然后撕去表面一层保护离型膜,粘贴到柔性线路板(FPC)上,在使用前,将另一层离型膜撕掉,才能粘贴到最终工作位置。在模切过程中会造成大量双面胶带的材料损失,原始采购胶带的有效使用率估计只有50%,同时几乎所有的粘贴动作都必须要由人工操作,故整个工序的成本非常高昂,并且无法实现机械自动化操作,导致工作效率低下且同一性差。因此,对于柔性线路板(FPC)与其它部件的连接是制约工效提高的一个障碍,是一个急待解决的问题。本发明中,设计一种新的工艺,能够在线原位固化制成压敏胶,从而实现了自动化操作以及大量的材料节省。
发明内容:
本发明的发明目的是公开一种在柔性线路板上印刷制备所需压敏胶的工艺方法,以实现柔性线路板与其它部件的高效率的连接。
实现本发明的技术解决方案是:所述的印刷制备工艺步骤如下:
a.在柔性线路板的特定位置设置开孔图案;
b.将压敏胶水在上述的开孔图案上涂布;
c.对上述的压敏胶水图案做初步固化。
所述的压敏胶水的组成(按重量百分比计)是:
Figure BSA0000151323550000021
其余为水,经强力搅拌条件下进行聚合反应制备。
所述的压敏胶水的组成(按重量百分比计)是:
Figure BSA0000151323550000022
所述的压敏胶的组成(按重量百分比计)是:
聚丙烯酸酯树脂 20~90%;
增粘树脂 1~10%;
醋酸丁酯 10~70%。
所述的初步固化为加热固化,加热温度为60~90℃,加热时间为5~30分钟。
所述的初步固化为在隔绝氧气的条件下进行紫外线曝光固化,具体是氧气浓度为<100ppm,紫外线光固化的固化能量>150mj/cm2
所述的初步固化为加热固化,加热温度为40~80℃,加热时间为10~30分钟。
所述的步骤b中的压敏胶水的厚度控制在5um~100um,或压敏胶水的厚度控制在50um~200um。
本发明不使用离型膜,物料的100%有效使用,没有浪费,通过印刷或者点涂的方式,将特殊合成的压敏胶原液直接涂覆于柔性线路板(FPC)的待粘接表面或将胶水已一定形状镂空印刷于FPC表面,在特定的条件下进行固化,从而有效地降低了成本,减少浪费,提升自动化水平,所使用的设备可为丝网印刷机或者smt印刷机,实现自动化作业。
具体实施方式:
下面详细给出本发明的具体实施方式,需要说明的是本发明的具体实施方式的详细描述是为便于对本发明的技术实质的全面了解,而不应视为是对本发明的权利要求的保护范围的限制。
本发明的具体实施例的技术解决方案是:所述的印刷制备工艺步骤如下:a.在柔性线路板的特定位置设置开孔图案;b.将压敏胶水在上述的开孔图案上涂布;c.对上述的压敏胶水图案做初步固化。在上述的步骤a中,所述的特定位置是指柔性线路板上与其它部件待粘接的位置(区域),在上述位置可以通过蚀刻钢板或丝网印刷的技术手段制备出开孔图案,该开孔图案更有利于压敏胶水的附着,上述的开孔图案的制备是可实现自动化作业的。由于压敏胶水具有特定的粘性,为有效的实现上述的步骤b中的压敏胶水的涂布,压敏胶水需要良好的流变性能才能满足涂布和连接强度的要求,因此上述的压敏胶水的稠度要合适,上述的稠度合适的压敏胶水在步骤c中被初步固化,而初步固化的压敏胶水则可满足上述的连接强度的要求。
上述的压敏胶水的组成(按重量百分比计)是:20~50%的丙烯酸异辛酯、1~15%的冰晶丙烯酸、1~50%的丙烯酸丁酯、1~20%的丙烯酸乙酯、0.5~5%的十二烷基硫酸钠、0.1~0.5%的过硫酸铵、0.1~0.5%的碳酸氢钠,其余为水,经强力搅拌制备。该压敏胶水在上述组分的配比下经过强力搅拌发生聚合反应,而制得稠度合适的聚丙烯酸酯型的压敏胶水;涂布在柔性线路板上后,其在初步固化阶段为加热固化,加热温度为60~90℃,加热时间为5~30分钟,经过初步固化的压敏胶水具有极佳的粘性,可保证粘接强度。
上述的压敏胶水的组成(按重量百分比计)是:80~95%的丙烯酸异辛酯、1~15%的冰晶丙烯酸、0.01~1%的安息香双甲醚和0.5~10%的气相白炭黑。该压敏胶水具有良好的流变性能和可调节的流变性能,可以完全适应相应的涂布方式,在涂布在柔性线路板上后,进行上述的步骤c中的初步固化,固化时需要控制胶面接触的氧气浓度,即在隔绝氧气的条件下进行紫外线曝光固化,其固化条件是氧气浓度<100ppm,紫外线光固化的固化能量>150mj/cm2,则压敏胶水经初步固化形成压敏胶,且具有良好的粘接强度。
上述的压敏胶水的组成(按重量百分比计)是:20~90%的聚丙烯酸酯树脂、1~10%的增粘树脂和10~70%的醋酸丁酯。该压敏胶水的组分组成中,醋酸丁酯的作用主要是作为溶液,混合后得到丙烯酸酯树脂类的溶液,通过溶剂的含量的调整,得到合适稠度或合适流变性能的压敏胶水,将上述的压敏胶水涂布在柔性线路板上后,进行初步固化,得到已涂布于柔性线路板上的压敏胶;上述的初步固化为热固化,热固化条件为加热温度为40~80℃,加热时间为10~30分钟,上述的压敏胶具有良好的粘接强度。
上述的三种压敏胶水均可调节稠度,经过反复试验压敏胶水的稠度或流变性能,再经初步固化测量粘接强度,得到当上述的步骤b中的涂布为丝网印刷,涂布的压敏胶水的厚度控制在5um~100um为最佳,特别是适合对柔性线路板与其它部件之间的连接强度不是很高的应用;如粘接强度要求较高,则在按上述的配方配比调节合适的稠度的压敏胶水后,以钢网印刷方式在柔性线路板涂布的压敏胶水的厚度控制在50um~200um范围,经过初步固化,所得的柔性线路板上的压敏胶具有较高的粘接强度。

Claims (7)

1.一种应用于柔性线路板的压敏胶的印刷制备工艺,其特征在于所述的印刷制备工艺步骤如下:
a.在柔性线路板的特定位置设置开孔图案;
b.将压敏胶水在上述的开孔图案上涂布;
c.对上述的压敏胶水图案做初步固化;
所述的压敏胶水的组成是:
Figure FSB0000182850320000011
其余为水,经强力搅拌条件下进行聚合反应制备。
2.根据权利要求1所述的应用于柔性线路板的压敏胶的印刷制备工艺,其特征在于所述的压敏胶水的组成是:
Figure FSB0000182850320000012
3.根据权利要求1所述的应用于柔性线路板的压敏胶的印刷制备工艺,其特征在于所述的压敏胶水的组成是:
聚丙烯酸酯树脂 20~90%;
增粘树脂 1~10%;
醋酸丁酯 10~70%。
4.根据权利要求1所述的应用于柔性线路板的压敏胶的印刷制备工艺,其特征在于所述的初步固化为加热固化,加热温度为60~90℃,加热时间为5~30分钟。
5.根据权利要求2所述的应用于柔性线路板的压敏胶的印刷制备工艺,其特征在于所述的初步固化为在隔绝氧气的条件下进行紫外线曝光固化,具体是氧气浓度为<100ppm,紫外线光固化的固化能量>150mj/cm2
6.根据权利要求3所述的应用于柔性线路板的压敏胶的印刷制备工艺,其特征在于所述的初步固化为加热固化,加热温度为40~80℃,加热时间为10~30分钟。
7.根据权利要求4或5或6所述的应用于柔性线路板的压敏胶的印刷制备工艺,其特征在于所述的步骤b中的压敏胶水的厚度控制在5um~100um,或压敏胶水的厚度控制在50um~200um。
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