CN107057600A - 水基丙烯酸导热双面胶带及其制作方法 - Google Patents

水基丙烯酸导热双面胶带及其制作方法 Download PDF

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CN107057600A
CN107057600A CN201611264823.0A CN201611264823A CN107057600A CN 107057600 A CN107057600 A CN 107057600A CN 201611264823 A CN201611264823 A CN 201611264823A CN 107057600 A CN107057600 A CN 107057600A
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sensitive adhesive
water
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甘露
轩慎亚
王俊飞
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WUHU YANGAO ADHESIVE NEW MATERIALS CO Ltd
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Abstract

本发明公开了一种水基丙烯酸导热双面胶带及其制作方法,包括:上压敏胶层、玻璃纤维织物层和下压敏胶层,玻璃纤维织物层两侧分别涂布上压敏胶层和下压敏胶层,上、下压敏胶层均为水基丙烯酸导热压敏胶层。本发明制得的水基丙烯酸导热双面胶带,结合了导热材料和胶粘带的两种特性,既具有高效的导热功能,又具有胶粘带的简单易操作和强力性。本发明通过碳酸氢钠颗粒和碳粉混合物的添加,能够有效改善水基丙烯酸导热压敏胶层内部的散热模式,显著提高其散热效果,从而提供一种具备良好散热功能的新型水基丙烯酸导热双面胶带。

Description

水基丙烯酸导热双面胶带及其制作方法
技术领域
本发明涉及粘胶带及其制作技术领域,特别是涉及一种水基丙烯酸导热双面胶带,并且还涉及这种水基丙烯酸导热双面胶带的制作方法。
背景技术
溶剂型压敏胶在固化后会有挥发性有机化合物残留。在遇到高温时会逐步挥发,形成环境荷尔蒙现象,对人体及周围环境产生污染。溶剂型压敏胶易燃、易爆有害的特点,特别是大多数含“三苯”类有机溶剂的高毒性,对人体和周围环境带来危害。
现有的导热双面胶带,大多以溶剂型压敏胶为载体掺杂导热粉体配制而成,用其涂布制得的导热双面胶带,虽然具有导热效果,但在遇高温时容易挥发有毒有害气体。对长时间处于高温状态的导热双面胶带而言,溶剂型压敏胶对人身和环境所带来的隐患是不言而喻的。
现有的水基丙烯酸压敏胶配制水基丙烯酸导热压敏胶会遇到分散性不够,出现团聚现象,或成膜性差,或导热不均匀。提高水基丙烯酸导热压敏胶的成膜性和导热均匀性一直是个难题,无人或企业取得突破。同时溶剂型压敏胶导热双面胶带的导热系数基本没有超过0.9w/m·k, 导热效果欠佳。
同时,现有的胶带主要用在电子元器件中,电子元器件往往处于高温的工作状态,当胶带的散热性能不佳时,会导致电子元器件因局部受热过高而失效、损坏,而现有技术中的胶带往往只起到密封和固定作用,不仅不能很好地导热,还因其隔热性更加不利于散热;因此,如何改进现有的胶带,使其达到理想的散热性能,是本领域亟需解决的技术难题。
发明内容
发明要解决的技术问题
本发明主要解决的技术问题是:针对现有技术的不足,提供一种水基丙烯酸导热双面胶带及其制作方法,使产品的导热系数达到1.18w/m·k(180℃),剥离强度达到26n/25mm,能够在电子器件和散热片之间建立高效、清洁的导热通道。
技术方案
为解决上述技术问题,本发明采用的一个技术方案是:提供一种水基丙烯酸导热双面胶带,包括:上压敏胶层、玻璃纤维织物层和下压敏胶层,所述玻璃纤维织物层两侧分别涂布上压敏胶层和下压敏胶层,所述上、下压敏胶层均为水基丙烯酸导热压敏胶层。
在本发明一个较佳实施例中,所述玻璃纤维织物层为网格状玻璃纤维织物层,网眼直径为0.25-0.35mm。
在本发明一个较佳实施例中,所述的上压敏胶层和下压敏胶层,由以下质量百分比的材料制成:水基耐高温丙烯酸压敏胶86-87%、陶瓷粉2-3%、氮化铝1-2%、氮化硼6-7%、分散剂1.2-1.5%、偶联剂1.5-1.8%。
在本发明一个较佳实施例中,所述的偶联剂为钛酸酯偶联剂。
上述的水基丙烯酸导热双面胶带的制作方法,包括以下步骤:
1)上、下压敏胶层的制备:将水基耐高温丙烯酸压敏胶掺杂陶瓷粉、氮化铝、氮化硼、分散剂和偶联剂,在45-55℃的温度下搅拌1.5-2.5 小时,制成水基丙烯酸导热压敏胶层;
2)涂布:在玻璃纤维织物层的一侧涂布上压敏胶层,使上压敏胶层均匀渗透玻璃纤维
织物层,在玻璃纤维织物层的另一侧形成下压敏胶层;
3)固化后与离型膜贴合再收卷,制成水基丙烯酸导热双面胶带。
在本发明一个较佳实施例中,所述步骤2)中的上、下压敏胶层的涂布总量为100-500g。
在本发明一个较佳实施例中,所述步骤3)中固化时的温度为105-135℃,速度为15-30m/min。
在本发明一个较佳实施例中,所述步骤3)制成的水基丙烯酸导热双面胶带还需经恒温室熟化,熟化温度为40-50℃,时间为20-28h。
进一步的,所述水基丙烯酸导热压敏胶层还包括以下成分:碳酸氢钠颗粒和碳粉的混合物,且该混合物的粒径小于0.1mm。
进一步的,当该水基丙烯酸导热双面胶带刚使用时,通过吹风机吹出的热风将其加热至50℃以上,持续30S后停止加热。
有益效果
本发明的有益效果是:本发明揭示了一种水基丙烯酸导热双面胶带及其制作方法,不同于普通导热双面胶带采用表面密度较大的玻璃纤维织物,而是采用表面密度较小的网格状玻璃纤维织物,便于均匀透胶,同时网格状锁住胶体,层与层之间相互粘接牢固,制得的水基丙烯酸导热双面胶带具有强韧性、优良的贴服性,还具备高效导热,强力粘接,施工简单的特点,且电气绝缘效果优异,广泛应用于大功率晶体管与散热片,集成电路与散热片,LED 显示屏和笔记本电脑、移动手机等行业和领域。
附图说明
图1 是本发明水基丙烯酸导热双面胶带一较佳实施例的结构示意图;
附图中各部件的标记如下:1、上压敏胶层,2、玻璃纤维织物层,3、下压敏胶层。
具体实施方式
下面结合附图对本发明的较佳实施例进行详细阐述,以使本发明的优点和特征能更易于被本领域技术人员理解,从而对本发明的保护范围做出更为清楚明确的界定。
请参阅图1 所示,本发明实施例包括:
实施例1:
如图1 所示的水基丙烯酸导热双面胶带的制作步骤为:
1)上、下压敏胶层的制备:上、下压敏胶层1、3 是由质量百分比为86% 的水基耐高温丙烯酸压敏胶掺杂3% 的陶瓷粉、2% 的氮化铝、6% 的氮化硼、1.5% 的分散剂、1.5% 的偶联剂,在50℃温度下搅拌2 小时制成的,水基耐高温丙烯酸压敏胶优选而非限于地选取由昆山石梅化工有限公司生产的HT-160 型水基耐高温丙烯酸压敏胶,陶瓷粉、氮化铝和氮化硼优选而非限于地选取上海沪正纳米科技有限公司生产的EK 50nm 型陶瓷粉、YN 50nm 型氮化铝和YC 50nm 型氮化硼,分散剂和偶联剂优选而非限于地选取高鼎精细化工(昆山)有限公司生产的OP31 型分散剂和KY-200 型钛酸酯偶联剂;
2)涂布:在玻璃纤维织物层2 的一侧涂布上压敏胶层1,使上压敏胶层1 均匀渗透玻璃纤维织物层2,在玻璃纤维织物层2 的另一侧形成下压敏胶层3,所述玻璃纤维织物层2为
网格状玻璃纤维织物层,网眼直径为0.25-0.35mm,优选为0.30mm,所述上、下压敏胶层1、3的涂布总量为100-500g,优选为300g ;
3)固化后与离型膜贴合再收卷,制成水基丙烯酸导热双面胶带,固化时的温度为105℃,速度为15m/min。
制成的水基丙烯酸导热双面胶带还需经恒温室熟化,熟化温度为45℃,时间为24h。
实施例2 :
仅将步骤1)中制得上、下压敏胶层的原料的质量百分比改为:水基耐高温丙烯酸压敏胶87%、陶瓷粉2%、氮化铝1%、氮化硼7%、分散剂1.2%、偶联剂1.8% ;将步骤3)中固化时的温度改为115℃,速度改为20m/min。其余同实施例1 的描述。
实施例3:
仅将步骤1)中制得上、下压敏胶层的原料的质量百分比改为:水基耐高温丙烯酸压敏胶86.5%、陶瓷粉2.5%、氮化铝1.5%、氮化硼6.5%、分散剂1.5%、偶联剂1.5% ;将步骤3)中固化时的温度改为135℃,速度改为30m/min。其余同实施例1 的描述。
由以上实施例制得的水基丙烯酸导热双面胶带,成膜均匀平整,公差率小于等于3%,导热系数达到1.18w/m·k(180℃),剥离强度达到26 n/25mm。
本发明揭示了一种水基丙烯酸导热双面胶带及其制作方法,不同于普通导热双面胶带采用表面密度较大的玻璃纤维织物,而是采用表面密度较小的网格状玻璃纤维织物,便于均匀透胶,同时网格状锁住胶体,层与层之间相互粘接牢固,制得的水基丙烯酸导热双面胶带具有强韧性、优良的贴服性,还具备高效导热,强力粘接,施工简单的特点,且电气绝缘效果优异,广泛应用于大功率晶体管与散热片,集成电路与散热片,LED 显示屏和笔记本电脑、移动手机等行业和领域。
同时,本实施例中,水基丙烯酸导热压敏胶层还包括以下成分:碳酸氢钠颗粒和碳粉的混合物,且该混合物的粒径小于0.1mm。当该水基丙烯酸导热双面胶带刚使用时,通过吹风机吹出的热风将其加热至50℃以上,持续30S后停止加热。由于固体碳酸氢钠在50℃以上开始逐渐分解生成二氧化碳,二氧化碳在水基丙烯酸导热压敏胶层内部生成,使得水基丙烯酸导热压敏胶层内部形成多孔的微小透气结构,有利于水基丙烯酸导热压敏胶层的对流换热(由于上述透气结构微小,并不会对水基丙烯酸导热压敏胶层的水密性能形成较大影响);同时,在水基丙烯酸导热压敏胶层内部多孔透气结构形成的同时,一部分碳粉会自动填充入水基丙烯酸导热压敏胶层内部的孔隙中,形成碳粉通道,从而在水基丙烯酸导热压敏胶层内部形成以碳粉通道为主的热传导通路,有利于水基丙烯酸导热压敏胶层的热传导。通过上面碳酸氢钠颗粒和碳粉混合物的添加,能够有效改善水基丙烯酸导热压敏胶层内部的散热模式,显著提高其散热效果,从而提供一种具备良好散热功能的新型水基丙烯酸导热双面胶带。(该申请案为中国专利号:201110451380.7的进一步改进。)
以上所述仅为本发明的实施例,并非因此限制本发明的专利范围,凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换,或直接或间接运用在其他相关的技术领域,均同理包括在本发明的专利保护范围内。

Claims (9)

1.一种水基丙烯酸导热双面胶带,包括:上压敏胶层、玻璃纤维织物层和下压敏胶层,其特征在于,所述玻璃纤维织物层两侧分别涂布上压敏胶层和下压敏胶层,所述上、下压敏胶层均为水基丙烯酸导热压敏胶层。
2.根据权利要求1 所述的水基丙烯酸导热双面胶带,其特征在于,所述玻璃纤维织物层为网格状玻璃纤维织物层,网眼直径为0.25-0.35mm。
3.根据权利要求1 所述的水基丙烯酸导热双面胶带,其特征在于,所述的上压敏胶层和下压敏胶层,由以下质量百分比的材料制成:水基耐高温丙烯酸压敏胶86-87%、陶瓷粉2-3%、氮化铝1-2%、氮化硼6-7%、分散剂1.2-1.5%、偶联剂1.5-1.8%。
4.根据权利要求3 所述的水基丙烯酸导热双面胶带,其特征在于,所述的偶联剂为钛酸酯偶联剂。
5.一种如权利要求1 所述的水基丙烯酸导热双面胶带的制作方法,其特征在于,包括以下步骤:
1)上、下压敏胶层的制备:将水基耐高温丙烯酸压敏胶掺杂陶瓷粉、氮化铝、氮化硼、分散剂和偶联剂,在45-55℃的温度下搅拌1.5-2.5 小时,制成水基丙烯酸导热压敏胶层;
2)涂布:在玻璃纤维织物层的一侧涂布上压敏胶层,使上压敏胶层均匀渗透玻璃纤维织物层,在玻璃纤维织物层的另一侧形成下压敏胶层;
3)固化后与离型膜贴合再收卷,制成水基丙烯酸导热双面胶带。
6.根据权利要求5 所述的水基丙烯酸导热双面胶带的制作方法,其特征在于,所述步骤2)中的上、下压敏胶层的涂布总量为100-500g,根据权利要求5 所述的水基丙烯酸导热双面胶带的制作方法,其特征在于,所述步骤3)中固化时的温度为105-135℃,速度为15-30m/min。
7.根据权利要求5 所述的水基丙烯酸导热双面胶带的制作方法,其特征在于,所述步骤3)制成的水基丙烯酸导热双面胶带还需经恒温室熟化,熟化温度为40-50℃,时间为20-28h。
8.根据权利要求1 所述的水基丙烯酸导热双面胶带,其特征在于,所述水基丙烯酸导热压敏胶层还包括以下成分:碳酸氢钠颗粒和碳粉的混合物,且该混合物的粒径小于0.1mm。
9.根据权利要求8所述的水基丙烯酸导热双面胶带,其特征在于:当该水基丙烯酸导热双面胶带刚使用时,通过吹风机吹出的热风将其加热至50℃以上,持续30S后停止加热。
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