Catalytic Synthesis, Characterization And Research Of Novel Functional Silane Coupling Agents

With the continuously expanding applications of silicone products, as well as the varietyand number of growing, organic silicone product range has been relatively large. It has becomethe chemicals which can not be replaced by other chemicals and the key material essential.Organosilicon materials are widely used in aerospace, electrical and electronic, textile, lightindustry, building, machinery, medical, food, transportation and other industrial sectors. Atpresent, silane coupling agent with its own unique performance and significant modificationeffect led to its production increased significantly, its applications are constantly expanding. Inthis dissertation, a series of novel silane coupling agents are synthesized by the hydrosilylationreaction, synthesis of sulfonic acid and organotin oxide composite catalysts and develop itscrystal. The crystal structures of the composite catalysts were determined by X-ray singlecrystal diffraction and their catalytic activities were evaluated.1. Synthesis of one kind of Karstedt catalyst (2,4,6,8-tetravinyl-2,4,6,8-tetramethyl-cyclotetrasiloxane), the catalyst has good activity and high catalytic activity selective. A novelfunctional silane coupling agents have been synthesized by this catalyst through thehydrosilylation reaction, they are ?-(methyl-acryloyl-oxy) propyl methyl dichlorosilane, ?-(methyl-acryloyl-oxy) propyl triethoxysilane and ?-(methyl-acryloyl-oxy) propyl methyldiethoxysilane. Their structures were characterized by using elemental analysis, IR, and1HNMR spectra. The effects of the type and amount of catalysts, reaction temperature, reactiontime, ratio of raw materials were discussed.2. Two new chlorine-containing silane coupling agents are synthesized by thehydrosilylation of1-hexadecene,1-octene with dichlorodimethylsilane using homemadeKarstedt catalyst; there are cetyl methyl dichlorosilane and octyl methyl dichlorosilane. Theirstructures are characterized by using of elemental analysis, IR,1H NMR. The effects of the typeand amount of catalysts, reaction temperature, reaction time, ratio of raw materials werediscussed on the optimum process conditions of the reaction.3. Under the catalyzation of homemade Karstedt catalyst, a linear alkyl coupling agentnamed decyl triethoxysilane decyl dimethyl silane are synthesized using1-decene andtriethoxysilane, methyldiethoxysilane and their structures are characterized by using ofelemental analysis, IR,1H NMR. The effects of the type and amount of catalysts, reactiontemperature, reaction time, ratio of raw materials were discussed.4. Two kinds of sulfonic acid-organotin oxide composite catalysts, p-toluenesulfonicacid-dibutyltin oxide composite catalysts and p-toluenesulfonic acid-triphenyltinl hydroxidecomposite catalysts, have been synthesized. Their crystal structures have been determined by X-ray single crystal diffraction. The composite catalysts are firstly used to catalyze thetransesterification of vinyl trimethoxysilane with ethylene glycol monomethyl ether, andsatisfactory results are obtained. The yield of vinyl (?-methoxyethoxy) silane can be achieved75.89%and70.12%, respectively, which are improved10percentage points more than earlierreported method. The catalysts are more inexpensive and easier to get than platinum catalysts.This is a novel method for the synthesis of silane coupling agent which has the higherapplication value in the actual industrial production.