碱处理对球形硅微粉性能的影响  

Effect of alkali treatment on surface modification of spherical silicon powder

作　　者：陈独旭 王冬至[1] 葛曷一[1] 刘小康 杜润生 韩凯洋 CHEN Duxu;WANG Dongzhi;GE Heyi;LIU Xiaokang;DU Runsheng;HAN Kaiyang(School of Material Science and Engineering,University of Jinan,Jinan 250022,China;Lanling Yixin Mining Technology Co.Ltd,Linyi 277700,China)

机构地区：[1]济南大学材料科学与工程学院,山东济南250022 [2]兰陵益新矿业科技有限公司,山东临沂277700

出　　处：《中国粉体技术》2023年第3期81-91,共11页China Powder Science and Technology

基　　金：山东省自然科学基金项目,编号:SZR2125。

摘　　要：使用硅烷偶联剂进行表面改性是1种工业上常用的球形硅微粉表面改性方法。然而球形硅微粉在生产过程中经过的高温球化工艺使其表面呈现化学惰性,需要一定的表面处理才能有更好的改性效果。为探究碱处理对球形硅微粉表面改性各项性能的影响,选用NaOH对球形硅微粉表面进行处理,通过表面形貌和表面接触角来确定最佳处理时间;选用γ-缩水甘油醚氧丙基三甲氧基硅烷(KH560)、γ-甲基丙烯酰氧基丙基三甲氧基硅烷(KH570)两种硅烷偶联剂对碱处理前后球形硅微粉进行表面改性并表征了吸油值、活化指数和接触角;将改性球形硅微粉与环氧树脂复合制成样品进行力学性能与导热系数测试。结果表明:碱处理后用3%质量分数的KH570、KH560分别对球形硅微粉进行改性,此时球形硅微粉的活化指数分别为78.9%、28.7%,接触角分别为126.51°、117.28°,吸油值分别为25.95%、26.70%;制得复合样品的弯曲强度分别提升18.2%、25.9%,冲击强度分别提升2.5%、21.6%,导热系数分别提升6.32%、11.82%。碱处理对KH560、KH570改性球形硅微粉的改性效果及其制成复合样品的力学导热性能均有提升。Surface modification with silane coupling agent is a commonly used surface modification method of spherical silicon powder in industry.However,the surface of spherical silicon micropowder is chemically inert due to the high-temperature sphe-roidization process in the production process,and a certain surface treatment is needed to have a better modification effect.In order to explore the influence of alkali treatment on the surface modification of spherical silicon powder,NaOH was used to treat the surface of spherical silicon powder,and the best treatment time was determined by surface morphology and contact angle.The silane coupling agents,y-glycidyl ether oxy propyl trimethoxysilane(KH560)and y-methacryloxy propyl trimethoxysilane(KH570),were used to modify the surface of spherical silica powder respectively before and after alkali treatment.The oil absorption value,the activation index and the contact angle were characterized.The mechanical properties and the thermal conductivity of modified spherical silicon powder/epoxy resin were tested.The results show that spherical silica powder is modified with 3%KH570 and KH560 respectively after alkali treatment.At this time,the activation index,contact angle and oil absorption of spherical silica powder are 78.9%and 28.7%,126.51°and 117.28°respectively,and 25.95%and 26.70%respectively.The bending strength,impact strength and thermal conductivity of the composite samples are increased by 18.2%and 25.9%,2.5%and 21.6%,6.32%and 11.82%respectively.Alkali treatment can improve the modification effect of the silica powder,the thermal mechanics and thermal conductivity of composite samples.

关 键 词：球形硅微粉 碱处理 硅烷偶联剂 表面改性 环氧树脂 

分 类 号：TQ127.2[化学工程—无机化工]