Siloxane preparation method and special venturi ejector
A siloxane and ejector technology, applied in chemical instruments and methods, chemical/physical/physical-chemical nozzle reactors, feeding devices, etc., can solve problems such as affecting quality, storage and transportation are not easy to preserve, etc. Simple, easy to implement and control, small viscosity change effect
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Embodiment 1
[0045] This embodiment provides a kind of preparation method of alkoxy-terminated polydimethylsiloxane, the steps are: component A, component B (orthosilicate methyl ester (Si(OCH 3) 4)) and Component C (component C is selected as triethylamine) is mixed according to the molar ratio of 100:40:0.1, and then added to a high-speed disperser and stirred and mixed evenly under the protection of argon to obtain a mixed material. The stirring speed is 200r / min, and the stirring The time is 30min, and the viscosity value of the obtained mixture is 10000mPa·s. After the stirring was completed, under the protection of argon, the mixture was placed at 0° C. for 24 h to carry out the terminal alkoxylation in-situ capping reaction. According to the rapid titanium reagent chemical method to test the capping effect, there is no viscosity peak phenomenon.
Embodiment 2
[0047] This embodiment provides a preparation method of alkoxy-terminated polydimethylsiloxane, the steps are as follows: component A, component B (orthosilicate ethyl (Si(OC 2 H 5) 4)) And component C (component C is mixed with triethylamine and zinc methacrylate in a molar ratio of 1:1) according to the molar ratio of 100:50:10, and then added to the high-speed disperser under the protection of argon Stir and mix evenly to obtain a mixed material, the stirring speed is 3000r / min, the stirring time is 1min, and the viscosity of the obtained mixed material is 15000mPa·s. After the stirring was completed, under the protection of argon, the mixture was placed at 100° C. for 0.5 h to carry out the terminal alkoxylation in-situ capping reaction. The viscosity value of the finally obtained alkoxy-terminated polydimethylsiloxane was 20000 mPa·s.
Embodiment 3
[0049] This embodiment provides a preparation method of alkoxy-terminated polydimethylsiloxane, the steps are: component A, component B (phenyl orthosilicate (Si(OC 5H 6) 4)) Mix with component C (component C is N-ethylhydroxylamine) according to the molar ratio of 100:45:5, and then add it to a high-speed disperser and stir and mix evenly under the protection of helium to obtain a mixture. The stirring speed is 1500r / min , the stirring time was 15min, and the viscosity value of the obtained mixture was 13500mPa·s. After the stirring was completed, under the protection of helium, the mixture was placed at 50° C. for 12 hours to carry out the terminal alkoxylation in-situ capping reaction. The viscosity value of the finally obtained alkoxy-terminated polydimethylsiloxane was 15000 mPa·s.
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