CN110202876B - 一种翘曲型热固性环氧板及其制备方法 - Google Patents

一种翘曲型热固性环氧板及其制备方法 Download PDF

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CN110202876B
CN110202876B CN201910482642.2A CN201910482642A CN110202876B CN 110202876 B CN110202876 B CN 110202876B CN 201910482642 A CN201910482642 A CN 201910482642A CN 110202876 B CN110202876 B CN 110202876B
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龚岳松
王运来
贺艳琼
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Guangdong Harvest Electronic Technology Co ltd
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Abstract

本发明公开了一种翘曲型热固性环氧板及其制备方法,所述翘曲型热固性环氧板,由若干张第一半固化片和第二半固化片堆叠后经过热压后再经过冷压成型得到,其中,第一半固化片在热压时的膨胀率和冷压时的收缩率不同于第二半固化片。本发明通过利用两种不同热膨胀和收缩系数的半固化片,经过热压模压得到的翘曲型热固性环氧板,不需要通过施加外力就可以实现一定幅度的翘曲,不易折伤、折断,并且它仍保留了环氧板的基本特性,具有绝缘、支撑等功能。

Description

一种翘曲型热固性环氧板及其制备方法
技术领域
本发明涉及复合材料技术领域,尤其涉及一种翘曲型热固性环氧板及其制备方法。
背景技术
环氧板作为复合材料中的一大类,具有良好的电气绝缘性能和机械性能,以及轻便、耐用的特点,在绝缘、支撑、装饰等领域得到了越来越广泛的应用。环氧板通常以玻璃布、玻璃毡、非织布、纸作为补强材料,浸渍环氧树脂、酚醛树脂等热固性树脂,经含浸机烘烤先制得半固化片,再裁切、堆叠,经热压机固化制成。环氧板通常采用的是同种体系的树脂配方制得,且在堆叠时考虑对称结构,在镜面钢板作为模具的情况下经过热压成型,由于结构对称,各层之间在热压和冷却成型阶段,其膨胀和收缩系数趋于一致,因而成品板材的翘曲度非常好。
环氧板作为板材的一种,一般都是在同一平面内起到绝缘、支撑、装饰、连接等作用,但也会遇到这种情形:两块环氧板需要通过胶黏剂连接,为了从中间向环氧板边沿赶出胶黏剂中的气泡和操作的方便,需要其中的一块环氧板具有一定的翘曲幅度,或者环氧板需要包绕曲面物体,此时的环氧板若能直接翘曲是最为理想的。但传统的层压板都是平整无翘曲的,故解决这一问题的办法通常是:1、整体异型模压成型。2、做成三明治结构,以较薄的层压板做夹心,用胶粘剂黏上特殊的织物作为柔软的表层,再经过特殊处理(如加热软化)使得需要弯曲的部分弯曲成需要的弧度。3、用其它材料制作挠曲部分,再以适当方式连接。但是,不论采用何种方式,都具有工艺复杂、成本较高、翘曲效果不理想的缺点。
因此,现有技术还有待于改进和发展。
发明内容
鉴于上述现有技术的不足,本发明的目的在于提供一种翘曲型热固性环氧板及其制备方法,旨在解决采用现有方法制备翘曲型环氧板,工艺复杂、成本较高、翘曲效果不理想的问题。
本发明的技术方案如下:
本发明提供了一种翘曲型热固性环氧板,由若干张第一半固化片和第二半固化片堆叠后经过热压后再经过冷压成型得到,其中,第一半固化片在热压时的膨胀率和冷压时的收缩率不同于第二半固化片。
所述的翘曲型热固性环氧板,其中,所述第一半固化片为FR4半固化片,所述第二半固化片为轻量半固化片。
所述的翘曲型热固性环氧板,其中,按重量份计,所述第一半固化片包括组分:
Figure BDA0002084349220000021
所述的翘曲型热固性环氧板,其中,所述第一无机填料包括二氧化硅、氢氧化铝、滑石粉、碳酸钙、氢氧化镁。
所述的翘曲型热固性环氧板,其中,按重量份计,所述第二半固化片包括组分:
Figure BDA0002084349220000022
Figure BDA0002084349220000031
所述的翘曲型热固性环氧板,其中,所述第二无机填料包括空心玻璃微珠、多孔二氧化硅,所述热固性树脂包括双酚A型固体环氧树脂901、双酚A型液体环氧树脂128。
本发明还提供了一种如以上任一项所述的翘曲型热固性环氧板的制备方法,其中,包括:
步骤A、将第一半固化片和第二半固化片分别裁切成需要的尺寸,按照预定张数比例进行预叠,得到半固化片组合;
步骤B、将预叠好的半固化片组合,双面覆盖离型膜,在温度170~200℃,压力10~25Kgf/cm2的条件下热压120~150min,然后以5~10Kgf/cm2的压力冷压45~90min成型,得到翘曲型热固性环氧板。
所述的制备方法,其中,所述步骤A中,所述预定张数比例,第一半固化片:第二半固化片=(1~4):(1~2)。
所述的制备方法,其中,所述步骤A中,按照第一半固化片靠一侧叠合,第二半固化片靠另一侧叠合。
所述的制备方法,其中,所述翘曲型热固性环氧板的厚度为0.2~1mm。
有益效果:本发明通过利用两种不同热膨胀和收缩系数的半固化片,经过热压模压得到的翘曲型热固性环氧板,不需要通过施加外力就可以实现一定幅度的翘曲,不易折伤、折断,并且它仍保留了环氧板的基本特性,具有绝缘、支撑等功能。
具体实施方式
本发明提供一种翘曲型热固性环氧板及其制备方法,为使本发明的目的、技术方案及效果更加清楚、明确,以下对本发明进一步详细说明。应当理解,此处所描述的具体实施例仅仅用以解释本发明,并不用于限定本发明。
本发明较佳实施例提供的一种翘曲型热固性环氧板,由若干张第一半固化片和第二半固化片堆叠后经过热压后再经过冷压成型得到,其中,第一半固化片在热压时的膨胀率和冷压时的收缩率不同于第二半固化片。优选的,所述第一半固化片为FR4半固化片,所述第二半固化片为轻量半固化片。其中,所述第一半固化片中树脂的密度为1~2g/cm3,例如可以为1g/cm3、1.45g/cm3、2g/cm3等;第二半固化片中树脂的密度为0.5~1.0g/cm3,例如可以为0.5g/cm3、0.8g/cm3、1.0g/cm3等。
本发明通过利用两种不同热膨胀和收缩系数的半固化片,经过热压模压得到的翘曲型热固性环氧板,不需要通过施加外力就可以实现一定幅度的翘曲,不易折伤、折断,并且它仍保留了环氧板的基本特性,具有绝缘、支撑等功能。
进一步的,本实施例中,按重量份计,所述第一半固化片包括组分:玻璃布32~56份,环氧树脂15~40份,酚醛树脂组合物10~20份,第一无机填料0~25份。例如,玻璃布可以为32份、40份、56份等,环氧树脂可以为15份、27份、40份等,酚醛树脂组合物可以为10份、13份、20份等,第一无机填料可以为0份、2份、13份、25份等。其中,所述第一无机填料包括但不限于二氧化硅、氢氧化铝、滑石粉、碳酸钙、氢氧化镁等等。所述第一半固化片的规格包括但不限于7628RC445、2116RC450、2116RC580、1080RC680等,对应的补强材料包括但不限于7628、2116、1080玻璃布等。
进一步的,本实施例中,按重量份计,所述第二半固化片包括组分:玻璃布30~70份,热固性树脂15~35份,偶联剂0~0.5份,促进剂0.02~0.2份,分散剂0~0.5份,第二无机填料18~40份。例如,玻璃布可以为30份、51份、70份等,热固性树脂可以为15份、26份、35份等,偶联剂可以为0份、0.2份、0.3份、0.5份等,促进剂可以为0.02份、0.1份、0.2份等,分散剂可以为0份、0.1份、0.4份、0.5份等,第二无机填料可以为18份、25份、40份等。所述第二半固化片的规格包括但不限于2116RC420、1080RC680等,对应的补强材料包括但不限于2116、1080玻璃布等。
进一步的,本实施例中,所述第二无机填料包括但不限于空心玻璃微珠等,选用空心玻璃微珠、多孔二氧化硅做填充料可以降低材料密度,实现材料的轻量化。所述热固性树脂包括但不限于双酚A型固体环氧树脂901、双酚A型液体环氧树脂128等。所述偶联剂包括但不限于硅烷偶联剂等,例如氨基硅烷、环氧硅烷等。所述促进剂包括但不限于咪唑类促进剂。
进一步的,本发明实施例还提供了一种如以上所述的翘曲型热固性环氧板的制备方法,其中,包括:
步骤S100、将第一半固化片和第二半固化片分别裁切成需要的尺寸,按照预定张数比例进行预叠,得到半固化片组合;
步骤S200、将预叠好的半固化片组合,双面覆盖离型膜,在温度170~200℃,压力10~25Kgf/cm2的条件下热压(即100℃以上)120~150min,然后以5~10Kgf/cm2的压力冷压(即常温下)45~90min成型,得到翘曲型热固性环氧板。
具体实施时,所述步骤S100中,所述预定张数比例,第一半固化片:第二半固化片=(1~4):(1~2),例如可以为1:1、2:1、3:1。预叠的原则是:按照第一半固化片靠一侧叠合,第二半固化片靠另一侧叠合。优选的,所述翘曲型热固性环氧板的厚度为0.2~1mm。
下面以具体实施例对本发明做详细说明:
实施例1
取第一半固化片(本公司生产的常规FR4半固化片,型号为WH3125,规格7628RC445),数量1pcs,其中,第一半固化片按重量份计包括:玻璃布55.5份,环氧树脂24.5份,酚醛树脂组合物10份,第一无机填料10份。
取第二半固化片(本公司生产的轻量半固化片,型号为WH3127,规格2116RC420),数量1pcs。其中,第二半固化片中按重量份计包括:玻璃布58份,热固性树脂21份,偶联剂0.5份,促进剂0.02份,分散剂0.48份,第二无机填料22份。
将第一半固化片和第二半固化片裁成适当尺寸,1张第一半固化片叠在一侧,1张第二半固化片叠在另一侧,叠加整齐,得到半固化片组合,将预叠好的半固化片组合,上下加离型膜,在温度170~200℃,压力10~25kg/cm2的条件下,经热压120min,5Kgf/cm2的压力冷压60min成型,得到翘曲型热固性环氧板。
实施例2
取第一半固化片(常规FR4半固化片,型号为WH3125,规格2116RC450),数量2pcs,其中,第一半固化片按重量份计包括:玻璃布55份,环氧树脂15份,酚醛树脂组合物20份,第一无机填料10份。
取第二半固化片(轻量半固化片,型号为WH3127,规格1080RC680),数量1pcs。其中,第二半固化片中按重量份计包括:玻璃布32份,热固性树脂35份,偶联剂0.4份,促进剂0.2份,分散剂0.4份,第二无机填料32份。
将第一半固化片和第二半固化片裁成适当尺寸,2张第一半固化片叠在一侧,1张第二半固化片叠在另一侧,叠加整齐,得到半固化片组合,将预叠好的半固化片组合,上下加离型膜,在温度170~200℃,压力10~25kg/cm2的条件下,经热压120min,5Kgf/cm2的压力冷压60min成型,得到翘曲型热固性环氧板。
实施例3
取第一半固化片(常规FR4半固化片,型号为WH3125,规格1080RC680),数量2pcs,其中,第一半固化片按重量份计包括:玻璃布32份,环氧树脂28份,酚醛树脂组合物15份,第一无机填料25份。
取第二半固化片(轻量半固化片,型号为WH3127,规格1080RC680),数量2pcs。其中,第二半固化片中按重量份计包括:玻璃布32份,热固性树脂32份,偶联剂0.3份,促进剂0.2份,分散剂0.5份,第二无机填料35份。
将第一半固化片和第二半固化片裁成适当尺寸,2张第一半固化片叠在一侧,2张第二半固化片叠在另一侧,叠加整齐,上下加离型膜,在温度170~200℃,压力10~25kg/cm2的条件下,经热压150min,10Kgf/cm2的压力冷压90min成型,得到翘曲型热固性环氧板。
对照例
取常规FR4半固化片,型号为WH3125,规格2116RC580,数量2pcs。将半固化片裁成适当尺寸,叠加整齐,上下加离型膜,在温度170~200℃,压力10~25kg/cm2的条件下,经热压120min,5Kgf/cm2的压力冷压60min成型。成型为普通热固性环氧板。
按照IPC-TM-650《试验方法手册》测试各样品的翘曲高度。把0.3mm板裁成300*200mm尺寸,样品放置于水平大理石平台,用高度规测量实际翘曲高度。检测结果见附表2。
表1实施例与对照例各结构的对比
Figure BDA0002084349220000071
表2实施例与比较例的测试结果
Figure BDA0002084349220000072
Figure BDA0002084349220000081
*高度规测试。样品结构如表1,尺寸长*宽=300*200mm。
结果表明:本发明的环氧板,具有自然翘曲的特性。在厚度0.2~1mm时,既具有传统层压板的支撑作用,在不需要施加外力的情况下,板材具有自然翘曲的功能。
应当理解的是,本发明的应用不限于上述的举例,对本领域普通技术人员来说,可以根据上述说明加以改进或变换,所有这些改进和变换都应属于本发明所附权利要求的保护范围。

Claims (8)

1.一种翘曲型热固性环氧板,其特征在于,由若干张第一半固化片和第二半固化片堆叠后经过热压后再经过冷压成型得到,其中,第一半固化片在热压时的膨胀率和冷压时的收缩率不同于第二半固化片;
按重量份计,所述第一半固化片包括组分:
Figure FDA0003351380880000011
按重量份计,所述第二半固化片包括组分:
Figure FDA0003351380880000012
2.根据权利要求1所述的翘曲型热固性环氧板,其特征在于,所述第一半固化片为FR4半固化片,所述第二半固化片为轻量半固化片。
3.根据权利要求1所述的翘曲型热固性环氧板,其特征在于,所述第一无机填料包括二氧化硅、氢氧化铝、滑石粉、碳酸钙、氢氧化镁。
4.根据权利要求1所述的翘曲型热固性环氧板,其特征在于,所述第二无机填料包括空心玻璃微珠、多孔二氧化硅,所述热固性树脂包括双酚A型固体环氧树脂901、双酚A型液体环氧树脂128。
5.一种如权利要求1~4任一项所述的翘曲型热固性环氧板的制备方法,其特征在于,包括:
步骤A、将第一半固化片和第二半固化片分别裁切成需要的尺寸,按照预定张数比例进行预叠,得到半固化片组合;
步骤B、将预叠好的半固化片组合,双面覆盖离型膜,在温度170~200℃,压力10~25Kgf/cm2的条件下热压120~150min,然后以5~10Kgf/cm2的压力冷压45~90min成型,得到翘曲型热固性环氧板。
6.根据权利要求5所述的制备方法,其特征在于,所述步骤A中,所述预定张数比例,第一半固化片:第二半固化片=(1~4):(1~2)。
7.根据权利要求5所述的制备方法,其特征在于,所述步骤A中,按照第一半固化片靠一侧叠合,第二半固化片靠另一侧叠合。
8.根据权利要求5所述的制备方法,其特征在于,所述翘曲型热固性环氧板的厚度为0.2~1mm。
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