镍/铁黑/丙烯酸树脂复合电磁波屏蔽涂料的制备和性能

Preparation and Properties of Ni/Fe3O4/Acrylic Resin Composite Electromagnetic Wave Shielding Coating

常温下，以丙烯酸树脂为成膜树脂，正丁醇、乙酸乙酯为混合溶剂，有机膨润土为分散剂，硅烷偶联剂为偶联剂，Ni粉和铁黑（Fe3O4）为导电填料，制得了Ni／Fe3O4／丙烯酸树脂复合电磁波屏蔽涂料。原料投料配比（wt％）以Ni粉55％，铁黑5％、丙烯酸树脂36．5％，硅烷偶联剂0．5％、分散剂3％为宜。对丙烯酸树脂原料进行共混改性可有效提高涂层在基材上的附着力，当氮化聚丙稀与丙烯酸树脂的质量比为1：8时，制得涂料的附着力达2级。适宜溶剂为乙酸乙酯：正丁醇=4：1的混合溶剂，硅烷偶联剂用量1％时涂层的导电性最佳，产品的电磁波屏蔽率〉99．9％。

At the normal temperature, the composite electromagnetic wave shielding coating of the Ni/Fe3O4/acrylic resin can be prepared, with acrylic resin as film forming resin , n-butyl alcohol and ethyl acetate as mixed solvent, organic bentonite as dispersant, silane coupling agent as coupling agent, nickel and ironoxideblack powder as conducting filler. The material proportioning（wt%）is nickel powder 55%, ironoxideblack 5%, acrylic resin 36.5%, silane coupling agent 0.5% and dispersant 3%.The adhesive force of the coating can be greatly improved by hybrid modifving for acrylic resin materials. When the weight ratio between chlorinated polypropylene and acrylic resin is 1：8, the adhesion of prepared coating is up to level 2. When the ratio of ethyl acetate and n-butyl alcohol in the mixed solvent is 4：1 and the amount of silane coupling agent is 1%, the electric conductivity of the coating is the best and its electromagnetic wave shielding effectiveness is more than 99.9%.