CN111690302A - 轻质高性能电磁屏蔽涂料及其制备工艺、施工工艺 - Google Patents
轻质高性能电磁屏蔽涂料及其制备工艺、施工工艺 Download PDFInfo
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Abstract
本发明涉及一种轻质高性能电磁屏蔽涂料及其制备工艺、施工工艺,包括树脂混合液30‑60%;空心银纤维12‑30%;无水乙醇5‑20%;丁醇5‑20%;分散剂0.3‑2%;防沉蜡浆0.1‑0.2%。本发明针对现在常见的金属纤维空心化处理,减小金属用量,从而减小面密度;通过对金属纤维空心化处理,增加电磁波反射衰减,达到更高的屏蔽效能;通过改进树脂体系,实现在低温和炎热条件下的正常使用;通过涂层工艺设计,使涂层中纤维有效搭接,实现较大的颜料体积浓度(PVC),增强屏蔽效能,兼顾涂层机械性能。
Description
技术领域:
本发明涉及涂料加工技术领域,尤其涉及一种轻质高性能电磁屏蔽涂料及其制备工艺、施工工艺。
背景技术:
目前电磁屏蔽涂料一般常用金属或碳系等导电材料实现对电磁波的屏蔽,金属材料以银、铜等电导率高的材料在高频波段有较好的屏蔽性能,但普通金属材料比重较大,不能得到较低的涂层面密度;碳系材料的导电性略差,屏蔽性能有局限,屏蔽效能不够高。
常见的电磁屏蔽涂料粘结剂采用环氧树脂、聚氨酯树脂等,耐低温冷脆性不太好。
常见的电磁屏蔽涂层要达到60db的屏蔽效能,往往涂层厚达几百微米。
发明内容:
为了克服上述的现有技术的缺点与不足,本发明的目的在于提高屏蔽涂层的屏蔽强度(效能),减小涂层面密度,扩大屏蔽电磁波的波段范围,降低涂层厚度;涂层能适应低温地区和炎热地区的使用。
本发明是通过如下技术方案实现的:
本发明提供一种轻质高性能电磁屏蔽涂料,由如下重量百分比的原料组成:
树脂混合液30-60%;
空心银纤维12-30%;
无水乙醇5-20%;
丁醇5-20%;
分散剂0.3-2%;
防沉蜡浆0.1-0.2%。
上述的树脂混合液制备工艺如下:
取适当粘度的聚乙烯醇缩丁醛(PVB),溶于丁醇、异丙醇、乙醇或前述醇类溶剂的混合物,根据需要的干燥时间调整醇类溶剂配合比以获得合理的挥发速率,得到约15%的PVB溶液;
取聚吡咯、聚噻吩、聚乙炔或它们的混合醇类分散液,与上述PVB溶液混合均匀,在玻璃反应瓶中加热回流30分钟,冷却备用。
上述的空心银纤维的制备工艺如下:
将玻璃纤维置于银氨溶液中镀银,控制温度和时间在适当值,以获得不同厚度的银镀层;
将镀银的玻璃纤维置于塑料反应器中,慢慢转动,并加入氢氟酸,通过称量,计算已经被反应掉的玻璃纤维量,达到90%时,取出过滤,清水洗涤至滤液呈中性;
电镜下观察,当玻璃纤维被氢氟酸洗脱后,剩余的银镀层就呈空心管状,此工艺同样适用于空心铜管的制备。
作为优选,所述分散剂为分散剂Tilo5532。
本发明还提供一种上述轻质高性能电磁屏蔽涂料的制备工艺,包括如下步骤:
将空心银纤维和部分无水乙醇、丁醇置于磁力搅拌釜内搅拌均匀,控制速度不超过50转,慢慢滴加分散剂,充分混合均匀;
将剩余的无水乙醇、丁醇倒入上述空心银纤维浆中,超声震荡,边振荡边缓缓加入树脂混合液,持续15分钟;
最后加入防沉蜡浆,搅拌混匀。
上述的轻质高性能电磁屏蔽涂料的施工工艺,包括如下步骤:
对塑料样板除油处理,晾干备用,压力水泥板擦拭干净,干燥;
将上述树脂混合液喷涂在样板上,控制厚度10μm以下,作为底漆;
在底漆干燥后,喷涂上述电磁屏蔽涂料中间漆,压力0.3MPa,物料流量0.5L/min,得到干膜厚度不超过15μm的中间涂层,控制中间漆喷涂时略有干喷现象,干燥后略有粗糙掉粉感即可;
电磁屏蔽涂料中间漆干燥后,喷涂上述树脂混合液,作为罩面漆,以上总厚度不超过25μm;
将样板用铜网垫紧后夹在开孔的钢板上,测试上述样板电磁屏蔽涂层效能。
本发明的有益效果是:
(1)针对现在常见的金属纤维空心化处理,减小金属用量,从而减小面密度;
(2)通过对金属纤维空心化处理,增加电磁波反射衰减,达到更高的屏蔽效能;
(3)通过改进树脂体系,实现在低温和炎热条件下的正常使用;
(4)通过涂层工艺设计,使涂层中纤维有效搭接,实现较大的颜料体积浓度(PVC),增强屏蔽效能,兼顾涂层机械性能。
附图说明
图1为采用本发明的轻质高性能电磁屏蔽涂料制作的电磁屏蔽测试板的结构示意图。
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被本领域人员理解,从而对本发明的保护范围做出更为清楚明确的界定。
实施例1:
一种轻质高性能电磁屏蔽涂料的制备工艺,包括如下步骤:
将空心银纤维15%和无水乙醇5%、丁醇5%置于磁力搅拌釜内搅拌均匀,控制速度不超过50转,慢慢滴加分散剂0.3%,充分混合均匀;
将剩余的无水乙醇5%、丁醇10%倒入上述空心银纤维浆中,超声震荡,边振荡边缓缓加入树脂混合液,持续15分钟;
最后加入防沉蜡浆0.1%,搅拌混匀,得到轻质高性能电磁屏蔽涂料。
其各项性能参数如下:
电导率104西门子,1G电磁屏蔽65db。
弯曲1mm圆棒,耐低温-40℃。
实施例2:
一种轻质高性能电磁屏蔽涂料的制备工艺,包括如下步骤:
将空心银纤维20%和无水乙醇7%、丁醇10%置于磁力搅拌釜内搅拌均匀,控制速度不超过50转,慢慢滴加分散剂0.4%,充分混合均匀;
将剩余的无水乙醇5%、丁醇5%倒入上述空心银纤维浆中,超声震荡,边振荡边缓缓加入树脂混合液,持续15分钟;
最后加入防沉蜡浆0.2%,搅拌混匀,得到轻质高性能电磁屏蔽涂料。
其各项性能参数如下:
1GHz屏蔽效能65db,3GHz屏蔽效能67db,10GHz屏蔽效能70db。
实施例3:
一种轻质高性能电磁屏蔽涂料的制备工艺,包括如下步骤:
将空心银纤维24%和无水乙醇5%、丁醇7%置于磁力搅拌釜内搅拌均匀,控制速度不超过50转,慢慢滴加分散剂0.8%,充分混合均匀;
将剩余的无水乙醇5%、丁醇7%倒入上述空心银纤维浆中,超声震荡,边振荡边缓缓加入树脂混合液,持续15分钟;
最后加入防沉蜡浆0.2%,搅拌混匀,得到轻质高性能电磁屏蔽涂料。
其各项性能参数如下:
1GHz屏蔽效能67db,3GHz屏蔽效能70db,10GHz屏蔽效能75%。
实施例4:
对塑料样板除油处理,晾干备用,压力水泥板擦拭干净,干燥;
将上述树脂混合液喷涂在样板上,控制厚度10μm以下,作为底漆;
在底漆干燥后,喷涂上述电磁屏蔽涂料中间漆,压力0.3MPa,物料流量0.5L/min,得到干膜厚度不超过15μm的中间涂层,控制中间漆喷涂时略有干喷现象,干燥后略有粗糙掉粉感即可;
电磁屏蔽涂料中间漆干燥后,喷涂上述树脂混合液,作为罩面漆,以上总厚度不超过25μm;
将样板1用铜网垫4及压紧螺栓3紧后夹在开孔的钢板上,如图1所示;
测试上述样板电磁屏蔽涂层2的效能;
屏蔽效能的检测:
1)定位测量点;
2)校准测量设备;
3)测量无发射时的环境电平H;
4)测量无屏蔽时在测量点接受到的发射源的电磁场强度W;
5)测量有屏蔽时在测量点接受到的发射机的电磁场强度Y;
6)计算分析屏蔽效能SE,
SE=20lg[(W-H)/(Y-H)]
上述样板表面电阻小于10-1Ω,
面密度小于100g/m2,
150MHz~10GHz,屏蔽效能不小于60db。
以上所述实施例仅表达了本发明的几种实施方式,其描述较为具体和详细,但并不能因此而理解为对发明专利范围的限制。应当指出的是,对于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。
Claims (6)
1.一种轻质高性能电磁屏蔽涂料,其特征在于,由如下重量百分比的原料组成:
树脂混合液30-60%;
空心银纤维12-30%;
无水乙醇5-20%;
丁醇5-20%;
分散剂0.3-2%;
防沉蜡浆0.1-0.2%。
2.根据权利要求1所述的轻质高性能电磁屏蔽涂料,其特征在于,所述树脂混合液制备工艺如下:
取适当粘度的聚乙烯醇缩丁醛,溶于醇类溶剂的混合物,根据需要的干燥时间调整醇类溶剂配合比以获得合理的挥发速率,得到约15%的聚乙烯醇缩丁醛溶液;
取聚吡咯、聚噻吩、聚乙炔或混合醇类分散液,与上述聚乙烯醇缩丁醛溶液混合均匀,在玻璃反应瓶中加热回流30分钟,冷却备用。
3.根据权利要求1所述的轻质高性能电磁屏蔽涂料,其特征在于,所述空心银纤维的制备工艺如下:
将玻璃纤维置于银氨溶液中镀银,控制温度和时间在适当值,以获得不同厚度的银镀层;
将镀银的玻璃纤维置于塑料反应器中,慢慢转动,并加入氢氟酸,通过称量,计算已经被反应掉的玻璃纤维量,达到90%时,取出过滤,清水洗涤至滤液呈中性;
电镜下观察,当玻璃纤维被氢氟酸洗脱后,剩余的银镀层就呈空心管状。
4.根据权利要求1所述的轻质高性能电磁屏蔽涂料,其特征在于,所述分散剂为分散剂Tilo5532。
5.一种如权利要求1-4任一项所述的轻质高性能电磁屏蔽涂料的制备工艺,其特征在于,包括如下步骤:
将空心银纤维和部分无水乙醇、丁醇置于磁力搅拌釜内搅拌均匀,控制速度不超过50转,慢慢滴加分散剂,充分混合均匀;
将剩余的无水乙醇、丁醇倒入上述空心银纤维浆中,超声震荡,边振荡边缓缓加入树脂混合液,持续15分钟;
最后加入防沉蜡浆,搅拌混匀。
6.一种如权利要求1-4任一项所述的轻质高性能电磁屏蔽涂料的施工工艺,其特征在于,包括如下步骤:
对塑料样板除油处理,晾干备用,压力水泥板擦拭干净,干燥;
将树脂混合液喷涂在样板上,控制厚度10μm以下,作为底漆;
在底漆干燥后,喷涂上述轻质高性能电磁屏蔽涂料作为中间漆,压力0.3MPa,物料流量0.5L/min,得到干膜厚度不超过15μm的中间涂层;
电磁屏蔽涂料中间漆干燥后,喷涂上述树脂混合液,作为罩面漆,以上总厚度不超过25μm;
将样板用铜网垫紧后夹在开孔的钢板上,测试上述样板电磁屏蔽涂层效能。
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