一种弹性体包覆型滑爽硅微粉的制备与性能研究

Study on preparation and properties of an elastomer coated sliding silicon micropowder

以侧链含氢硅油(PHMS)、乙烯基三乙氧基硅烷(VTES)以及乙烯基硅油(VSO)为原料通过硅氢加成制得透明状有机硅弹性体(SE);然后进一步制得弹性体凝胶(SEG),将其乳化成弹性体乳液(SEE)并作为表面修饰剂包覆聚甲基倍半硅氧烷(PMSQ)制得滑爽型硅微粉(CPMSQ).分别用傅里叶红外(FT-IR)和扫描电镜(SEM)等对产物结构和形貌进行表征,并讨论了合成工艺条件对SE产率、状态的影响以及不同实验因素对CPMSQ滑爽度的影响.结果表明:当VTES用量为8%,PHMS中硅氢含量为0.18%时,制得的透明弹性固体SE产率较高,且当乙烯基硅油VSO分子量为3 000时得到的弹性体粉末的滑爽度最佳;另外,包覆过程中当定型温度为110℃,m(SEE)∶m(PMSQ)=1∶10时,CPMSQ具有优异的滑爽度.

Transparent organosilicon elastomers （SE） are prepared by addition of silicon lay drogen in side chain hydrogen containing silicone oil （PHMS）, vinyl triethoxy silane （VTES） and vinyl silicone oil （VSO）. Then the elastomer gel （SEG） was further prepared,and it was emulsified into elastomer emulsion （SEE） and coated with polymethylsilsesquioxane （PMSQ） as a surface modifier to produce smooth silicon micro powder （CPMSQ）. The structure and morphology of the products were characterized by Fourier transform infrared （FT IR） and scanning electron microscopy （SEM）. The effects of synthetic conditions on the yield and state of SE and the effect of different factors on the smoothness of CPMSQ were al so discussed. The results show that when the amount of VTES is 8%% and the content of sili con hydrogen in PHMS is 0.18%,the SE yield of the transparent elastic solid is higher,and the smoothness of the elastomer powder is the best when the VSO molecular weight of the vinyl silicone oil is 3 000;In addition,when the setting temperature is 110 ℃ and re（SEE） ： m（PMSQ） =1 ： 10 in the coating process,the CPMSQ has excellent smoothness.