CN106211731A - 一种复合电磁屏蔽散热薄膜及其制备方法 - Google Patents
一种复合电磁屏蔽散热薄膜及其制备方法 Download PDFInfo
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Abstract
本发明涉及电磁屏蔽散热薄膜的技术领域,提出一种复合电磁屏蔽散热薄膜及其制备方法。一种复合电磁屏蔽散热薄膜,其特征在于:从上至下依次由热辐射层、热传导层和增韧电磁屏蔽层复合而成;所述热辐射层为碳纳米管涂层;所述热传导层为柔性石墨纸;所述增韧电磁屏蔽层为金属层。本发明的复合电磁屏蔽散热薄膜具有电磁屏蔽和散热功能,同时具有良好的散热效率和韧性,且质轻、占用空间小、成本低,适应散热、电磁屏蔽的要求,其制备方法简单易行。
Description
技术领域
本发明涉及电磁屏蔽散热薄膜的技术领域,本发明提出一种复合电磁屏蔽散热薄膜及其制备方法。
背景技术
在新能源、通信、化工、电子工业等领域中,设备在运行过程中不可避免的会产生热量,从而自身温度升高,进而影响其稳定性、安全性和使用寿命。散热材料的使用能使设备运行所产生的热量传递到散热装置及周围环境中,保证设备运行时温度不会过高。另外,随着电子技术的飞速发展,电子元件在工作时产生的电磁波频率也越来越高,对相邻部件的干扰程度也加深。电磁屏蔽是解决电子设备电磁兼容问题的重要手段之一,目的是抑制电磁噪声的传播,使处在电磁环境中的仪器在避免电磁干扰的同时也不产生电磁干扰。
因此,在电子工业中,需要有能同时满足散热和电磁屏蔽的材料。CN201410140979.2以混有软磁性材料粉末的有机粘结剂涂覆在沉积有金属膜散热膜表面并固化得到电磁屏蔽散热膜,但其制造周期长、工艺较为复杂、成本高,且该膜厚度在30mm以上,占用空间大,不适用于小型设备。CN201310550525.8以辐射散热材料涂布于金属表面再贴合导热胶制成一种具有电磁屏蔽功能的热辐射散热膜,但其厚度较厚,散热效果较差。
综上,研发一种同时具备电磁屏蔽和散热功能,而且散热效率高、韧性好、质轻、占用空间小、成本低等优点的材料是一个亟待解决的问题。
发明内容
本发明的目的在于提出一种具有电磁屏蔽和散热功能的复合电磁屏蔽散热薄膜,其具有良好的散热效率和韧性,韧性主要表现为冲裁成型时有效克服了石墨纸飞边明显的缺点,且质轻、占用空间小、成本低,适应散热、电磁屏蔽的要求,并且提供其制备方法。
为达此目的,本发明采用以下技术方案:
一种复合电磁屏蔽散热薄膜,从上至下依次由热辐射层、热传导层和增韧电磁屏蔽层复合而成;所述热辐射层为碳纳米管涂层;所述热传导层为柔性石墨纸;所述增韧电磁屏蔽层为金属层。
优选的,所述碳纳米管涂层的涂料为碳纳米管分散液,其固含量≥8%。
更优的,所述碳纳米管分散液的固含量为10%。
优选的,所述金属层的材质为铜或镍,所述金属层为单一金属的网或箔,或者为两层或两层以上的相同或不同金属形成的金属复合网或复合箔。
优选的,所述薄膜还包括导热胶层,所述导热胶层设置于所述薄膜的最底层,且贴合于所述所述增韧电磁屏蔽层,所述导热胶层的厚度为0.03-0.2mm。
优选的,所述导热胶层由导热物质和胶组成,所述导热物质为碳化硅、石墨及氧化铝中的至少一种,平均粒径为5-50μm;所述胶为丙烯酸胶或硅胶。
一种制备复合电磁屏蔽散热薄膜的方法,包括以下步骤:
步骤1),制备厚度为15μm-1mm的柔性石墨纸;
步骤2),将碳纳米管分散液涂覆在厚度为15μm-1mm的柔性石墨纸上,且涂覆不少于一层,涂覆厚度为3-10μm,并在50-80℃热风下干燥;
步骤3),在步骤2)中的柔性石墨纸的另一面衬上至少一层金属层,通过轧制使金属层和柔性石墨纸复合在一起,同时将碳纳米管涂层轧制密实,并与柔性石墨纸紧密复合。
优选的,还包括步骤4),将导热胶层涂覆或贴合于步骤3)的金属层的另一面。
有益效果在于:
本发明的复合电磁屏蔽散热薄膜具有电磁屏蔽和散热功能,同时具有良好的散热效率和韧性,且质轻、占用空间小、成本低,适应散热、电磁屏蔽的要求,其制备方法简单易行。
附图说明
图1是本发明中复合电磁屏蔽散热薄膜其中一种实施例的结构示意图;
图2是本发明中复合电磁屏蔽散热薄膜其中一种实施例的制备工艺流程图。
其中,热辐射层11、热传导层12、增韧电磁屏蔽层13、导热胶层14。
具体实施方式
下面结合附图并通过具体实施方式来进一步说明本发明的技术方案。
一种复合电磁屏蔽散热薄膜,从上至下依次由热辐射层11、热传导层12和增韧电磁屏蔽层13复合而成;所述热辐射层11为碳纳米管涂层,发挥了碳纳米管辐射率极高的优势;所述热传导层12为柔性石墨纸,发挥了石墨纸热传导快,导热系数高的优点;所述增韧电磁屏蔽层13为金属层,既具有很好的电磁屏蔽效能又克服了石墨纸脆性大,加工成型时易于飞边的缺点。
本发明所述的复合电磁屏蔽散热薄膜,其结构包括碳纳米管涂层、柔性石墨纸层和金属网层,三者通过轧制复合一起,各层具有各自的独特、优异性能,且可以形成互补,从而增强整体的电磁屏蔽及散热效果。
所述热传导层11中的碳纳米管具有极高的热导率(1750—5800W/mK),且主要热传递方式是热辐射,辐射系数接近1,是一种优异的散热材料,通过热辐射快速将热量传导周围环境中,提高薄膜的散热效率。
所述热辐射层12为柔性石墨纸,其制备方法为柔性石墨纸一般制备方法,即对可膨胀石墨进行膨胀,膨胀后获得膨胀石墨,对膨胀石墨进行轧制获得柔性石墨纸,厚度为15μm-1mm。柔性石墨纸可快速有效地将热量传递给碳纳米管涂层。
所述增韧电磁屏蔽层13为金属层可以提高薄膜的韧性,具有电磁屏蔽功能,还能够辅助散热。
在散热功能方面,柔性石墨纸和碳纳米管涂层均可导热、散热。柔性石墨纸具有较高的导热率,可快速有效地将热量传递给碳纳米管涂层。碳纳米管具有极高的导热率,通过热辐射快速将热量传导周围环境中。
在电磁屏蔽方面,金属网、金属箔具有电磁屏蔽功能。相比金属板作为屏蔽体时所有的成本高、质量重的问题,金属网、金属箔拥有轻便、层薄的优点。
在整体的结构设计方面,将碳纳米管制成分散液涂覆在柔性石墨纸上,使得这两者在散热方式上互为补充,达到优异的散热效果。与金属层的复合一方面为石墨纸增韧,另一方面为复合薄膜增加了电磁屏蔽功能,此外,还可辅助导热。导热胶在导热同时,减少薄膜与热源之间热阻。
优选的,所述碳纳米管涂层的涂料为碳纳米管分散液,其固含量≥8%。
将碳纳米管制成分散液涂覆于柔性石墨纸上,其可与柔性石墨纸充分接触,使得这两者在散热方式上互为补充,达到优异的散热效果。
优选的,所述碳纳米管分散液的固含量为10%。
优选的,所述金属层的材质为铜或镍,所述的金属层为单一金属的网或箔,或者为两层或两层以上的相同或不同金属形成的金属复合网或复合箔。
当然,理论上所述金属层的材质还可以是金、银、铁,铝、锌或合金,但实验证明铜或镍在本发明中的应用效果最优。
制成金属板作为屏蔽体,其成本高、质量重,制成金属网或金属箔,则具有轻便、层薄的特点。金属层经最终轧制后厚度为10-40μm。
优选的,所述薄膜还包括导热胶层14,所述导热胶层14设置于所述薄膜的最底层,且贴合于所述增韧电磁屏蔽层13,所述导热胶层14的厚度为0.03-0.2mm。
导热胶层14在导热的同时,能减少复合电磁屏蔽散热薄膜与热源之间的热阻。
进一步的,所述导热胶层14由导热物质和胶组成,所述导热物质为碳化硅、石墨及氧化铝中的至少一种,平均粒径为5-50μm;所述胶为丙烯酸胶或硅胶。
所述导热物质还可以是其它热导率较高的陶瓷或金属。
一种制备复合电磁屏蔽散热薄膜的方法,包括以下步骤:
步骤1),制备厚度为15μm-1mm的柔性石墨纸;
步骤2),将碳纳米管分散液涂覆在厚度为15μm-1mm的柔性石墨纸上,且涂覆不少于一层,涂覆厚度为3-10μm,并在50-80℃热风下干燥;
步骤3),在步骤2)中的柔性石墨纸的另一面衬上金属层,通过轧制使金属层和柔性石墨纸复合在一起,同时将碳纳米管涂层轧制密实,并与柔性石墨纸紧密复合。
步骤2)中,所述涂覆方式为刮涂、喷涂、逆涂、狭缝涂布等。
优选的,还包括步骤4),将导热胶层涂覆或贴合于步骤3)的金属层的另一面。
下文给出的实施例均按上述步骤制备获得复合电磁屏蔽散热薄膜,下文不再赘述。
实施例1:
复合电磁屏蔽散热薄膜中的热辐射层11为3μm的碳纳米管,所用分散液固含量为9%。热传导层12为25μm柔性石墨纸,增韧电磁屏蔽层13为40μm紫铜网,导热胶层厚度为50μm,导热系数为1.0W/mK。
实施例2:
复合电磁屏蔽散热薄膜中的热辐射层11为4μm的碳纳米管,所用分散液固含量为9%。热传导层12为20μm柔性石墨纸,增韧电磁屏蔽层13为40μm镍箔,导热胶层厚度为60μm,导热系数为1.3W/mK。
实施例3:
复合电磁屏蔽散热薄膜中的热辐射层11为5μm的碳纳米管,所用分散液固含量为10%。热传导层12为35μm柔性石墨纸,增韧电磁屏蔽层13为30μm紫铜网,导热胶层厚度为70μm,导热系数为1.1W/mK。
实施例4:
复合电磁屏蔽散热薄膜中的热辐射层11为5μm的碳纳米管,所用分散液固含量为10%。热传导层12为30μm柔性石墨纸,增韧电磁屏蔽层13为28μm镍网,导热胶层厚度为50μm,导热系数为1.3W/mK。
实施例5:
复合电磁屏蔽散热薄膜中的热辐射层11为6μm的碳纳米管,所用分散液固含量为9%。热传导层12为25μm柔性石墨纸,增韧电磁屏蔽层13为35μm铜箔,导热胶层厚度为40μm,导热系数为1.3W/mK。
实施例6:
复合电磁屏蔽散热薄膜中的热辐射层11为7μm的碳纳米管,所用分散液固含量为9%。热传导层12为40μm柔性石墨纸,增韧电磁屏蔽层13为25μm镍网,导热胶层厚度为80μm,导热系数为1.2W/mK。
实施例7:
复合电磁屏蔽散热薄膜中的热辐射层11为7μm的碳纳米管,所用分散液固含量为10%。热传导层12为60μm柔性石墨纸,增韧电磁屏蔽层13为18μm铜箔。导热胶层厚度为50μm,导热系数为1.0W/mK。
实施例8:
复合电磁屏蔽散热薄膜中的热辐射层11为8μm的碳纳米管,所用分散液固含量为10%。热传导层12为50μm柔性石墨纸,增韧电磁屏蔽层13为20μm镍网,导热胶层厚度为40μm,导热系数为1.0W/mK。
导热性能测试实验:取直径为20mm的复合薄膜,贴于12V/2W的PTC恒温发热片上,热平衡后后发热片温度由初始的60℃可降至45℃。
屏蔽效能实验:屏蔽效能(dB)是遵照ASTM-D-4935测试标准通过安捷伦E5061A矢量网络测试仪,DN1015屏蔽效能测试装置测试的,其结果列于表1。由测试结果可知,在0-1GHz的频率范围内,实施例1-8的电磁波屏蔽效能均在80dB以上。
韧性测试:用15mm×15mm方形冲模和φ10mm的圆形冲模对所制备薄膜进行冲裁成型,肉眼观察冲裁片边沿是否出现飞边。
表1,本发明8个实施例的复合电磁屏蔽散热薄膜性能测试结果
本发明中碳纳米管分散液固含量、碳纳米管涂层厚度、柔性石墨纸厚度、金属网及金属箔厚度、导热胶厚度之上下限值均能实现本发明,不限于实施例中的数值;碳纳米管分散液固含量不限于实施例中的数值;在此不一一列举实施例。
以上内容仅为本发明的较佳实施例,对于本领域的普通技术人员,依据本发明的思想,在具体实施方式及应用范围上均会有改变之处,本说明书内容不应理解为对本发明的限制。
Claims (8)
1.一种复合电磁屏蔽散热薄膜,其特征在于:从上至下依次由热辐射层、热传导层和增韧电磁屏蔽层复合而成;所述热辐射层为碳纳米管涂层;所述热传导层为柔性石墨纸;所述增韧电磁屏蔽层为金属层。
2.如权利要求1所述的复合电磁屏蔽散热薄膜,其特征在于:所述碳纳米管涂层的涂料为碳纳米管分散液,其固含量≥8%。
3.如权利要求2所述的复合电磁屏蔽散热薄膜,其特征在于:所述碳纳米管分散液的固含量为10%。
4.如权利要求1所述的复合电磁屏蔽散热薄膜,其特征在于:所述金属层的材质为铜或镍,所述的金属层为单一金属的网或箔,或者为两层或两层以上相同或不同金属形成的金属复合网或复合箔。
5.如权利要求1所述的复合电磁屏蔽散热薄膜,其特征在于:所述薄膜还包括导热胶层,所述导热胶层设置于所述薄膜的最底层,且贴合于所述增韧电磁屏蔽层,所述导热胶层的厚度为0.03-0.2mm。
6.如权利要求5所述的复合电磁屏蔽散热薄膜,其特征在于:所述导热胶层由导热物质和胶组成,所述导热物质为碳化硅、石墨及氧化铝中的至少一种,平均粒径为5-50μm;所述胶为丙烯酸胶或硅胶。
7.一种制备如权利要求1所述的复合电磁屏蔽散热薄膜的方法,其特征在于,包括以下步骤:
步骤1),制备厚度为15μm-1mm的柔性石墨纸;
步骤2),将碳纳米管分散液涂覆在厚度为15μm-1mm的柔性石墨纸上,且涂覆不少于一层,涂覆厚度为3-10μm,并在50-80℃热风下干燥;
步骤3),在步骤2)中的柔性石墨纸的另一面衬上至少一层金属层,通过轧制使金属层和柔性石墨纸复合在一起,同时将碳纳米管涂层轧制密实,并与柔性石墨纸紧密复合。
8.如权利要求7的制备复合电磁屏蔽散热薄膜的方法,其特征在于:还包括步骤4),将导热胶层涂覆或贴合于步骤3)的金属层的另一面。
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