Silane modified polyether intermediate, silane modified polyether polymer and preparation method thereof
A silane-modified polyether and polymer technology, applied in the field of sealants, can solve the problems of easy generation of air bubbles, unfavorable storage and construction, etc., and achieve the effects of long storage period, low water sensitivity and mild reaction conditions
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[0050] The preparation method of the silane-modified polyether polymer of the present application, it comprises the following steps:
[0051] Step (1): Under an inert atmosphere, the pre-treated allyl-terminated polyether and tetramethyldihydrodisiloxane are subjected to a hydrosilylation reaction under the action of a catalyst, and then the unreacted tetrahydrosiloxane is removed under reduced pressure. Methyldihydrodisiloxane obtains intermediate shown in general II;
[0052]
[0053] Step (2): Under an inert atmosphere, the intermediate shown in General II and vinylalkoxysilane are subjected to a hydrosilylation reaction under the action of a catalyst.
[0054] The silane-modified polyether polymer with low moisture sensitivity and easy storage and construction can be produced through such a production method.
[0055] In step (1), the inert atmosphere is preferably a nitrogen atmosphere.
[0056] In step (1), the allyl-terminated polyether is preferably one or both of...
Embodiment 1
[0070] In the four-necked flask equipped with agitator, constant pressure dropping funnel, reflux condenser and gas guide tube, add 200g pretreated molecular weight successively as terminal allyl polyoxypropylene glycol, 30ppm chloroplatinic acid catalyst of 8000, Introduce nitrogen and start stirring, heat up to 80°C, add dropwise 8.9g of tetramethyldihydrodisiloxane, dropwise complete within 30min, react for 5h after the dropwise addition, after the reaction, -0.085MPa, 80°C Evaporate under reduced pressure for 0.5h; add vinyltrimethoxysilane to the flask, heat up to 90°C, and react for 4h to obtain a trimethoxysilane-capped polyether polymer.
Embodiment 2
[0072] In the four-necked flask equipped with agitator, constant pressure dropping funnel, reflux condenser and gas guide tube, add 200g pretreated molecular weight successively as terminal allyl polyoxypropylene glycol, 40ppm chloroplatinic acid catalyst of 10000, Introduce nitrogen and start stirring, heat up to 90°C, add 7.6g of tetramethyldihydrodisiloxane dropwise, complete the dropwise addition within 30min, react for 4h after the dropwise addition, after the reaction, -0.09MPa, 90°C Evaporate under reduced pressure for 0.5 h; then add vinyl triethoxysilane to the flask, heat up to 100°C, and react for 3 h to obtain triethoxysilane-capped polyether polymer.
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