Citation: . THE EFFECT OF THE ACID CATALYST ON THE PREPARATION OF MQ SILICONE RESINS[J]. Chinese Journal of Polymer Science, ;1999, 17(5): 429-433. shu

THE EFFECT OF THE ACID CATALYST ON THE PREPARATION OF MQ SILICONE RESINS

Received Date: 28 May 1998

MQ silicone resins were prepared through hydrolytic condensation of ethyl polysilicate ortetraethoxysilane and hexamethyl disiloxane. The unit ratio of the MQ resins was determined by 29Si-NMR.The relationship of the unit ratio of the product resins with that in the feed was studied. When the reactionwas catalyzed by aqueous hydrochloric acid, and the unit ratio of M to Q in the feed was more than 1, the unitratio of the product was usually lower than that of the feed. The MQ silicon with an unit ratio of M/Q>2 could not be obtained.However if the reaction was catalyzed by concentrated sulfuric acid and the reverse hydrolysis process was employed,MQ silicone resin with very high M/Q ratio was successfully prepared.
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