CN107216476A - 一种电磁屏蔽用导电泡棉 - Google Patents
一种电磁屏蔽用导电泡棉 Download PDFInfo
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- 239000006260 foam Substances 0.000 title claims abstract description 23
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 155
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 76
- 239000011159 matrix material Substances 0.000 claims abstract description 18
- 239000000843 powder Substances 0.000 claims abstract description 18
- 239000000945 filler Substances 0.000 claims abstract description 10
- 229910021536 Zeolite Inorganic materials 0.000 claims abstract description 8
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000002156 mixing Methods 0.000 claims abstract description 8
- 239000010457 zeolite Substances 0.000 claims abstract description 8
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims abstract description 6
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 6
- 239000011777 magnesium Substances 0.000 claims abstract description 6
- 229920001568 phenolic resin Polymers 0.000 claims abstract description 6
- 239000005011 phenolic resin Substances 0.000 claims abstract description 6
- 239000000758 substrate Substances 0.000 claims abstract description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 48
- 239000000243 solution Substances 0.000 claims description 30
- 229910052681 coesite Inorganic materials 0.000 claims description 26
- 229910052906 cristobalite Inorganic materials 0.000 claims description 26
- 239000000377 silicon dioxide Substances 0.000 claims description 26
- 229910052682 stishovite Inorganic materials 0.000 claims description 26
- 229910052905 tridymite Inorganic materials 0.000 claims description 26
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 24
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
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- 238000003756 stirring Methods 0.000 claims description 14
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 11
- 238000007747 plating Methods 0.000 claims description 10
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 10
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- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 claims description 2
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 claims description 2
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- FPCJKVGGYOAWIZ-UHFFFAOYSA-N butan-1-ol;titanium Chemical compound [Ti].CCCCO.CCCCO.CCCCO.CCCCO FPCJKVGGYOAWIZ-UHFFFAOYSA-N 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- HSJPMRKMPBAUAU-UHFFFAOYSA-N cerium(3+);trinitrate Chemical compound [Ce+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O HSJPMRKMPBAUAU-UHFFFAOYSA-N 0.000 claims description 2
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- IKDUDTNKRLTJSI-UHFFFAOYSA-N hydrazine monohydrate Substances O.NN IKDUDTNKRLTJSI-UHFFFAOYSA-N 0.000 claims description 2
- 239000003999 initiator Substances 0.000 claims description 2
- 238000009413 insulation Methods 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
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- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims 1
- 239000005864 Sulphur Substances 0.000 claims 1
- PMUIBVMKQVKHBE-UHFFFAOYSA-N [S].NC(N)=O Chemical compound [S].NC(N)=O PMUIBVMKQVKHBE-UHFFFAOYSA-N 0.000 claims 1
- 238000001354 calcination Methods 0.000 claims 1
- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 claims 1
- UFMZWBIQTDUYBN-UHFFFAOYSA-N cobalt dinitrate Chemical class [Co+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O UFMZWBIQTDUYBN-UHFFFAOYSA-N 0.000 claims 1
- 229910001981 cobalt nitrate Inorganic materials 0.000 claims 1
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- 241000165940 Houjia Species 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011538 cleaning material Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
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- LGQLOGILCSXPEA-UHFFFAOYSA-L nickel sulfate Chemical compound [Ni+2].[O-]S([O-])(=O)=O LGQLOGILCSXPEA-UHFFFAOYSA-L 0.000 description 1
- 229910000363 nickel(II) sulfate Inorganic materials 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
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- C09D161/04—Condensation polymers of aldehydes or ketones with phenols only
- C09D161/06—Condensation polymers of aldehydes or ketones with phenols only of aldehydes with phenols
- C09D161/14—Modified phenol-aldehyde condensates
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Abstract
本申请涉及一种电磁屏蔽用导电泡棉，该导电泡棉包括薄膜基体，在薄膜基体上下表面设有电磁屏蔽层；该电磁屏蔽层以镁酚醛树脂为基底，以多层空心镍、沸石粉、碳纳米管为填料，混炼后涂覆在薄膜基体表面得到。
Description
技术领域
本申请涉及导电泡棉领域，尤其涉及一种电磁屏蔽用导电泡棉。
背景技术
导电泡棉是一种集导电和电磁屏蔽功能于一体的材料，它是一种三维网状结构，具有发泡孔径均匀、柔软、富有弹性、不脱屑的优点；还具有导电有效期长，屏蔽效果好，不受温度和湿度的影响，表面电阻值可按实际用途设定等特点，广泛应用于计算机、LCD显示器、液晶电视、激光打印机、高速复印机、通讯设备、移动电话、卫星通信、医疗设备、仪表仪器、垫片/隔板、插板电子产品、防震导电的包装。
目前，导电泡棉主要采用三维多孔聚氨酯海棉为基材，这种基材为三维多孔结构，具有较大的比表面积，但随着电子技术的快速发展，对电磁屏蔽材料超薄化的要求、以及电磁屏蔽材料表面电阻和垂直电阻特性的要求越来越高。
发明内容
本发明旨在提供一种电磁屏蔽用导电泡棉，以解决上述提出问题。
本发明的实施例中提供了一种电磁屏蔽用导电泡棉，该导电泡棉包括薄膜基体，在薄膜基体上下表面设有电磁屏蔽层；该电磁屏蔽层以镁酚醛树脂为基底，以多层空心镍、沸石粉、碳纳米管为填料，混炼后涂覆在薄膜基体表面得到。
本发明的实施例提供的技术方案可以包括以下有益效果：
本发明的导电泡棉在薄膜基体上下表面设有电磁屏蔽层，该电磁屏蔽层中填料包括多层空心镍，该多层空心镍以空心镍为磁性相，SiO2、TiO2为非磁性相，具体为多层空心结构的TiO2/SiO2/空心镍，在该结构中，由于空心结构，使得该多层空心镍密度有效降低，实现了轻质化的要求；此外，由于空心结构，电磁波入射到其中时，可使电磁波在其空腔内形成多重反射，从而增加其吸波损耗，提高了吸收性能。
本申请附加的方面和优点将在下面的描述中部分给出，部分将从下面的描述中变得明显，或通过本申请的实践了解到。应当理解的是，以上的一般描述和后文的细节描述仅是示例性和解释性的，并不能限制本申请。
附图说明
利用附图对本发明作进一步说明，但附图中的实施例不构成对本发明的任何限制，对于本领域的普通技术人员，在不付出创造性劳动的前提下，还可以根据以下附图获得其它的附图。
图1是本发明导电泡棉的结构示意图；
图2是本发明多层空心镍的结构示意图；
其中，01-薄膜基体，02-电磁屏蔽层，03-空心镍，04-SiO2，05-TiO2。
具体实施方式
这里将详细地对示例性实施例进行说明，其示例表示在附图中。下面的描述涉及附图时，除非另有表示，不同附图中的相同数字表示相同或相似的要素。以下示例性实施例中所描述的实施方式并不代表与本发明相一致的所有实施方式。相反，它们仅是与如所附权利要求书中所详述的、本发明的一些方面相一致的装置和方法的例子。
本申请的实施例涉及一种电磁屏蔽用导电泡棉，结合图1，该导电泡棉包括薄膜基体01，所述薄膜基体01采用聚氨酯材料制备，该薄膜基体01的厚度为3mm，质量密度为30g/m2；在薄膜基体01上下表面设有电磁屏蔽层02。
上述所述的电磁屏蔽层，其以镁酚醛树脂为基底，以多层空心镍、沸石粉、碳纳米管为填料，混炼后涂覆在薄膜基体表面得到，该电磁屏蔽层02厚度为500μm。
其中，各填料的重量百分数为：多层空心镍21％、沸石粉11％、碳纳米管9％。
本申请中所述的多层空心镍，其粒径为5μm，其镍壳厚度为0.3μm；结合图2，其以空心镍03为磁性相，SiO204、TiO205为非磁性相，具体为多层空心结构的TiO2/SiO2/空心镍。
该多层空心镍是这样形成的：首先采用羰基铁粉为模板，包覆Ni镀层，然后通过腐蚀内部羰基铁粉，获得空心镍03，然后在空心镍03表面依次包覆SiO204、TiO205，最后得到多层空心结构的TiO2/SiO2/空心镍。
镍粉是一种常用的磁性金属粉，是一种传统的吸波剂，但是，实心的镍粉密度较大，空心化是降低磁性金属粉密度的方法之一，空心化通常的做法是在空心微珠表面包覆具有吸波性能的涂层，比如铁层、镍层，然而，由于空心微珠本身并没有吸波性能，采用空心微珠为主的吸波材料的吸波性能难以进一步提高。
本申请的技术方案中，在本身具有吸波性能的空心镍表面包覆SiO2、TiO2，可以达到改善吸波性能的目的。
本申请的电磁屏蔽层中，包含多层空心镍，该多层空心镍以空心镍为磁性相，由于空心结构，使得该复合吸波材料密度有效降低，实现了轻质化的要求；此外，由于空心结构，电磁波入射到其中时，可使电磁波在其空腔内形成多重反射，从而增加其吸波损耗，提高了吸收性能。
本申请的电磁屏蔽层中，包含多层空心镍，该多层空心镍将空心镍与TiO2结合，TiO2化学性质较稳定，是一种重要的半导体材料，一般用于光催化自清洁材料，或者用于造纸、橡胶等制品中，作为填充剂、着色剂使用，在本申请的多层空心镍中，将空心镍与TiO2结合，可以提高空心镍的微波损耗效率，明显改善其电磁参数，提高其微波吸收性能。
本申请技术方案中，进一步地，还在空心镍与TiO2之间设有SiO2，这是由于TiO2的介电常数较大，当空心镍与TiO2直接结合，会大幅增加吸波材料的介电常数，不利于吸波材料的空间阻抗匹配，而SiO2化学性质比较稳定，不溶于水也不跟水反应，是一种酸性氧化物，同时是一种低介电常数材料，在空心镍与TiO2之间设有SiO2，将SiO2作为空心镍与TiO2之间的过渡层，能够使该多层空心镍磁导率增加的同时，介电常数增加有限，有利于吸波性能的提高。
本申请技术方案中，所述的多层空心镍的制备过程如下：
步骤1，制备空心镍：筛选粒径为5μm的羰基铁粉，将其在丙酮中超声处理30min，然后将其放入1mol/L的稀盐酸中浸泡20s，处理后将其放入真空干燥箱中干燥；然后将0.1mol/L硫酸镍溶液和40g/L酒石酸钠溶液混合，充分搅拌后，加入0.8g/L的硫脲溶液继续搅拌，让硫脲充分溶解，随后加入55g/L的水合肼溶液，充分搅拌均匀，得到浑浊液，向浑浊液中边搅拌边加入1mol/L的氢氧化钠溶液调节pH至11，使得浑浊溶液变为无沉淀的溶液，即为镀镍的镀液；将上述配置好的镀液放入90℃的水浴中预热，预热10min后将上述预处理的羰基铁粉倒入镀液中，其中羰基铁粉的质量与镀液的体积之比为30g/L，在恒温水浴中90℃匀速搅拌，反应3h后，将粉末过滤，用蒸馏水和乙醇洗涤，在真空干燥箱中50℃干燥2h，得到羰基铁/镍复合粉；然后将所得的羰基铁/镍复合粉放入1mol/L的稀盐酸中，反应充分后，将粉末过滤，干燥得到空心镍；
步骤2，包覆SiO2：将上述得到的空心镍加入到无水乙醇溶液中，超声搅拌，然后加入适量的H2O，再加入适量的正硅酸乙酯无水乙醇混合液，最后缓慢滴加氨水调节pH，再次超声分散搅拌，加入少量柠檬酸修饰表面，过滤，洗涤，干燥得到空心结构SiO2/空心镍；
步骤3，表面处理SiO2/空心镍：
将去离子水、乳化剂十二烷基苯磺酸铵(SDBS)、聚氧乙烯辛基酚醚(OP-10)加入装有机械搅拌、回流冷凝管、氮气保护及温度计的反应容器中，水浴加热至70℃，搅拌使其溶解得到备用的乳化体系；将硅烷偶联剂KH-570和上步的SiO2/空心镍加入到苯乙烯中，超声10min后加入乳化体系，乳化半小时后再加入引发剂过硫酸铵和缓冲剂NaHCO3，升温至90℃并保温3.0h，再升至95℃保温0.5h后停止反应，破乳，用热水反复洗涤，干燥得到PS/SiO2/空心镍；
步骤4，制备TiO2/SiO2/空心镍
在烧瓶中加入去离子水，然后加入适量SDBS和聚乙烯吡咯烷酮(PVP)，用盐酸调节其pH值为2.3，然后边搅拌边将钛酸四丁酯和无水乙醇的混合溶液加入，然后加入五水硝酸钴和硝酸铈的无水乙醇溶液，继续搅拌1h，然后加入上述的PS/SiO2/空心镍，用氨水调节pH值，在60℃下静置24h，用蒸馏水和无水乙醇洗涤，干燥后得到TiO2/PS/SiO2/空心镍，去除PS，在600℃煅烧5h得到空心结构的TiO2/SiO2/空心镍，即为多层空心镍。
然后，以镁酚醛树脂为基底，以上述的多层空心镍、沸石粉、碳纳米管为填料，混炼后涂覆在薄膜基体上下表面，形成电磁屏蔽层，对上述的电磁屏蔽层进行屏蔽效能测试，发现，其电磁波衰减效果比较好，最大损耗达到28dB，损耗效率超过10dB的连续频率宽度接近11.4GHz，该吸波体密度较小，吸波频带宽，吸波性能强。
以上所述仅为本发明的较佳方式，并不用以限制本发明，凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。
Claims (7)
1.一种电磁屏蔽用导电泡棉，其特征在于，该导电泡棉包括薄膜基体，在薄膜基体上下表面设有电磁屏蔽层；该电磁屏蔽层以镁酚醛树脂为基底，以多层空心镍、沸石粉、碳纳米管为填料，混炼后涂覆在薄膜基体表面得到。
2.根据权利要求1所述的导电泡棉，其特征在于，所述薄膜基体采用聚氨酯材料制备。
3.根据权利要求2所述的导电泡棉，其特征在于，所述薄膜基体的厚度为3mm，质量密度为30g/m2。
4.根据权利要求1所述的导电泡棉，其特征在于，该电磁屏蔽层中，所述的多层空心镍以空心镍为磁性相，SiO2、TiO2为非磁性相，具体为多层空心结构的TiO2/SiO2/空心镍。
5.根据权利要求4所述的导电泡棉，其特征在于，该多层空心镍粒径为5μm，镍壳厚度为0.3μm。
6.根据权利要求5所述的导电泡棉，其特征在于，所述的多层空心镍的制备过程如下：
步骤1，制备空心镍：筛选粒径为5μm的羰基铁粉，将其在丙酮中超声处理30min，然后将其放入1mol/L的稀盐酸中浸泡20s，处理后将其放入真空干燥箱中干燥；然后将0.1mol/L硫酸镍溶液和40g/L酒石酸钠溶液混合，充分搅拌后，加入0.8g/L的硫脲溶液继续搅拌，让硫脲充分溶解，随后加入55g/L的水合肼溶液，充分搅拌均匀，得到浑浊液，向浑浊液中边搅拌边加入1mol/L的氢氧化钠溶液调节pH至11，使得浑浊溶液变为无沉淀的溶液，即为镀镍的镀液；将上述配置好的镀液放入90℃的水浴中预热，预热10min后将上述预处理的羰基铁粉倒入镀液中，其中羰基铁粉的质量与镀液的体积之比为30g/L，在恒温水浴中90℃匀速搅拌，反应3h后，将粉末过滤，用蒸馏水和乙醇洗涤，在真空干燥箱中50℃干燥2h，得到羰基铁/镍复合粉；然后将所得的羰基铁/镍复合粉放入1mol/L的稀盐酸中，反应充分后，将粉末过滤，干燥得到空心镍；
步骤2，包覆SiO2：将上述得到的空心镍加入到无水乙醇溶液中，超声搅拌，然后加入适量的H2O，再加入适量的正硅酸乙酯无水乙醇混合液，最后缓慢滴加氨水调节pH，再次超声分散搅拌，加入少量柠檬酸修饰表面，过滤，洗涤，干燥得到空心结构SiO2/空心镍；
步骤3，表面处理SiO2/空心镍：
将去离子水、乳化剂十二烷基苯磺酸铵(SDBS)、聚氧乙烯辛基酚醚(OP-10)加入装有机械搅拌、回流冷凝管、氮气保护及温度计的反应容器中，水浴加热至70℃，搅拌使其溶解得到备用的乳化体系；将硅烷偶联剂KH-570和上步的SiO2/空心镍加入到苯乙烯中，超声10min后加入乳化体系，乳化半小时后再加入引发剂过硫酸铵和缓冲剂NaHCO3，升温至90℃并保温3.0h，再升至95℃保温0.5h后停止反应，破乳，用热水反复洗涤，干燥得到PS/SiO2/空心镍；
步骤4，制备TiO2/SiO2/空心镍
在烧瓶中加入去离子水，然后加入适量SDBS和聚乙烯吡咯烷酮(PVP)，用盐酸调节其pH值为2.3，然后边搅拌边将钛酸四丁酯和无水乙醇的混合溶液加入，然后加入五水硝酸钴和硝酸铈的无水乙醇溶液，继续搅拌1h，然后加入上述的PS/SiO2/空心镍，用氨水调节pH值，在60℃下静置24h，用蒸馏水和无水乙醇洗涤，干燥后得到TiO2/PS/SiO2/空心镍，去除PS，在600℃煅烧5h得到空心结构的TiO2/SiO2/空心镍，即为多层空心镍。
然后，以镁酚醛树脂为基底，以上述的多层空心镍、沸石粉、碳纳米管为填料，混炼后涂覆在薄膜基体上下表面，形成电磁屏蔽层，对上述的电磁屏蔽层进行屏蔽效能测试，发现，其电磁波衰减效果比较好，最大损耗达到28dB，损耗效率超过10dB的连续频率宽度接近11.4GHz，该吸波体密度较小，吸波频带宽，吸波性能强。
7.根据权利要求1所述的导电泡棉，其特征在于，该电磁屏蔽层厚度为500μm；该电磁屏蔽层中各填料的重量百分数为：多层空心镍21％、沸石粉11％、碳纳米管9％。
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