银包铜粉/EVA电磁屏蔽塑料的制备及增韧改性研究  

Preparation and Toughening Modification Research of Silver Plating Copper Powder/EVA Electromagnetic Shielding Plastics

作　　者：黄恒辉 于天文 黄昭政 王宇源 HUANG Heng-hui;YU Tian-wen;HUANG Zhao-zheng;WANG Yu-yuan(Shenzhen Woer Heat-Shrinkable Material Co.,Ltd.,Shenzhen 518118,China)

机构地区：[1]深圳市沃尔核材股份有限公司,广东深圳518118

出　　处：《塑料科技》2024年第5期47-51,共5页Plastics Science and Technology

摘　　要：采用3种不同粒径的银包铜粉(Ag@Cu)与乙烯-醋酸乙烯共聚物(EVA)进行熔融共混,分别制备不同质量分数的电磁屏蔽塑料,考察Ag@Cu的不同质量分数和粒径对EVA基电磁屏蔽塑料导电性能、屏蔽性能及力学性能的影响。分别使用马来酸酐接枝乙烯-辛烯共聚物/乙烯-辛烯共聚物(POE-g-MAH/POE)增韧母粒和聚异丁烯(PIB)/萜烯增韧母粒对EVA基电磁屏蔽塑料进行增韧改性,获得高填充电磁屏蔽塑料。结果表明:随着Ag@Cu填充量的增加,EVA基电磁屏蔽塑料的导电性能增加,而力学性能下降,复合材料的渗滤阈值随填料粒径增加而降低,Ag@Cu填充量为80%时,屏蔽效能随填充粒径增加而增加。与POE-g-MAH/POE相比,PIB/萜烯的增韧改性效果最佳,断裂伸长率提升至187.3%,屏蔽效能在30~1 000 MHz范围内保持在70 dB以上,表现出更好的挤出加工性。Electromagnetic shielding plastics with different mass fractions were prepared by melt blending three kinds of silver-coated copper powder(Ag@Cu)with ethylene-vinyl acetate copolymer(EVA).The effects of different mass fractions and particle sizes of Ag@Cu on the electrical conductivity,shielding properties and mechanical properties of EVA-based electromagnetic shielding plastics were investigated.EVA-based electromagnetic shielding plastics were toughened by maleic anhydride grafted ethylene-octene copolymer/ethylene-octene copolymer(POE-g-MAH/POE)toughening masterbatch and polyisobutylene(PIB)/terpene toughening masterbatch,respectively,to obtain highly filled electromagnetic shielding plastics.The results show that with the increase of Ag@Cu content,the electrical conductivity of EVA-based electromagnetic shielding plastics increases,while the mechanical properties decrease.The percolation threshold of the composites decreases with the increase of filler particle size.When the Ag@Cu filling content is 80%,the shielding effectiveness increases with the increase of filling particle size.Compared with POE-g-MAH/POE,the toughening effect of PIB/terpene is the best,the elongation at break is increased to 187.3%,the shielding effectiveness is kept above 70 dB in the range of 30~1000 MHz,and it shows better extrusion processability.

关 键 词：乙烯-醋酸乙烯共聚物 高填充 屏蔽效能 增韧改性 挤出加工 

分 类 号：TQ327.8[化学工程—合成树脂塑料工业]