摘要
采用硅烷偶联剂A-172对环氧浇注用填料氧化铝进行湿法改性,分析了A-172的添加量、pH值、反应温度等因素对水煮电导率、水煮液pH值的影响及对其环氧浇注物料初始黏度、可使用时间和固化物力学性能的影响。结果表明:通过测定粉体活化度获得较佳工艺条件:改性剂用量为1.5%,pH值为5.0,反应温度为80℃,此时粉体活化指数可达99.0%。改性后粉体电导率明显降低,可使用时间延长,浇注件的断裂弯曲强度和拉伸强度分别提高了17.07%和2.60%,电气强度提高了24.63%,体积电阻率平均值为3.35×10^(16)Ω·cm,说明A-172偶联剂能有效调节氧化铝环氧浇注体系的黏度和可使用时间,改善环氧浇注固化物的力学性能和绝缘性能。红外光谱分析表明,改性氧化铝与偶联剂有多处吸收峰重合,A-172偶联剂和粉体之间发生了化学键合。
Alumina fillers for epoxy casting were modified by wet process using silane coupling agent A-172, the effects of A-172 dosage, pH value, and reaction temperature on the conductivity and p H value of alumina boiling solution, and effect on the initial viscosity and usable time of the epoxy casting material and the mechanical properties of the cured product were studied. The results show that the optimum process condition is obtained through measuring the activation index of powder, that is, the content of modifier is 1.5%, the pH value is 5.0, and the reacting temperature is 80 ℃. The activation index of the powder reaches 99.0% under the process condition. After modification, the conductivity of the powder decreases obviously, and the usable time increases. The bending strength, tensile strength, and electric strength of the cured product increase by 17.07%, 2.60%, and 24.63%, respectively. The mean volume resistivity is 3.35×10^（16）Ω·cm. It is indicated that the silane coupling agent A-172 can effectively adjust the viscosity and usable time of the alumina epoxy casting system, and improve the mechanical and insulating properties of the epoxy casting cured product. According to FTIR spectra, there are many characteristic peaks of the modified alumina and coupling agent overlapped, which indicates that the alumina powder has occurred chemical bonding with A-172.
作者
曹亚蒙
陈燕
李贺
陈晓光
CAO Yameng, CHEN Yan, LI He, CHEN Xiaoguang(Zhengzhou Non-ferrous Metals Research Institute Co. Ltd of CHALCO, Zhengzhou 450041, China)
出处
《绝缘材料》
CAS
北大核心
2018年第10期27-32,共6页
Insulating Materials
关键词
硅烷偶联剂
氧化铝
环氧浇注
表面改性
silane coupling agent
alumina
epoxy casting
surface modification
