Multifunctional alkoxy-terminated polysiloxane polymer and preparation method thereof
A technology of polysiloxane and functional alkane, which is applied in the field of polymers, can solve the problems of less alkoxy-terminated silicone oil, affect the quality of silicone oil, reduce the transparency of silicone oil, etc., and achieve the effect of simple preparation process and improved quality
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[0068] A method for preparing a polyfunctional alkoxy-terminated polysiloxane polymer, the preparation method comprising: putting in cyclosiloxane, a silane coupling agent and water, performing hydrolytic condensation and prepolymerization, wherein the The silicon atom of the silane coupling agent is connected with an alkoxy group;
[0069] Water and alcohols are removed, and then a catalyst is added to carry out copolymerization and equilibrium ring-opening polymerization to break the media and remove small molecular substances to obtain the polyfunctional alkoxy-terminated polysiloxane polymer. The schematic diagram of the reaction process is as figure 1 shown.
[0070] In the present invention, no additional catalyst is added during the hydrolysis and condensation process, and a strong base catalyst is added after the prepolymerization, dehydration and dealcoholization, which not only prevents the influence of water and alcohol on the catalyst, but also improves the speed ...
Embodiment approach
[0074] As an embodiment of the present invention, the molar ratio n (silane coupling agent) / n (water) of the silane coupling agent to water is 10 -5 ~10 5 , preferably 0.05-20, more preferably 0.1-10.
[0075] As an embodiment of the present invention, the molar ratio n (silane coupling agent) / n (cyclosiloxane) of the cyclosiloxane to the silane coupling agent is 10 -5 ~10 5 , preferably 0.01-100, more preferably 0.1-10.
[0076] In the present invention, the silane coupling agent and cyclosiloxane are put into the reaction container at one time, and the hydrolysis, condensation, prepolymerization and ring-opening polymerization processes are carried out at the same time, and the water, cyclosiloxane and silane coupling agent are adjusted The molar ratio ensures that the silaneoxy groups are not completely hydrolyzed and condensed, controls the viscosity of the silicone oil, and finally obtains a polysiloxane with functional organic groups in the side chain of the polysilox...
Embodiment 1
[0120] Octamethylcyclotetrasiloxane (200g, 0.674mol), aminopropylmethyldiethoxysilane (10g, 0.0524mol), water (0.94g, 0.0524mol) were added to a 500mL three-necked flask to obtain a mixture A, install a spherical condenser and a mechanical stirrer; gradually heat the mixture A to 100°C under heating in an oil bath, and reflux and stir for 6 hours to carry out hydrolysis condensation and prepolymerization to obtain a mixture B; cool the mixture B to room temperature, pass The method of vacuum distillation removes ethanol and residual water produced by hydrolysis in the system at a temperature of 50 ° C and a pressure of 0.01 MPa to obtain a prepolymer; then add tetramethylammonium hydroxide to the prepolymer. Alkali glue (1g, tetramethylammonium hydroxide content 1wt% in alkali glue), under normal pressure and 110 ℃, carry out copolymerization and equilibrium ring-opening polymerization reaction 5 hours, obtain polymer; Heating up to 140 ℃, insulation 30 minutes, Decompose the ...
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