Preparation method of methyl phenyl silanediol

The invention relates to a preparation method of methyl phenyl silanediol, which comprises the following steps of: adding phenyl methyl cyclotetrasiloxane and tetramethyl divinyl disiloxane into a reduced pressure stirring jacket tank with a vent valve at the bottom, stirring and mixing well, heating to 70-85 DEG C, stirring and dehydrating under the conditions of -0.11 to -0.13 MPa, separating out an upper-layer product by a decanting method, and carrying out reduced pressure distillation and filtration to obtain phenyl methyl silanediol. The method is simple in process and suitable for industrial popularization. As low alcohol is used for washing, the proportion of small molecules can be further reduced by 5%. The phenyl methyl silanediol is obtained through equilibrium polymerization of a base catalyst, and the phenyl methyl silanediol is high in stability, good in lubricity and good in glossiness. 一种甲基苯基硅二醇的制备方法，将苯基甲基环四硅氧烷和四甲基二乙烯基二硅氧烷加入底部带通气阀的减压搅拌夹套罐中，搅拌混匀后升温至70℃～85℃、-0.11～-0.13MPa的条件下搅拌脱水，最后滗析法分出上层产物减压蒸馏