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

Pending Publication Date: 2022-03-25
杭州四马化工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the terminal hydroxyl groups of polydimethylsiloxane are reactive, so it is not easy to preserve during storage and transportation, and the quality is easily affected by the condensation reaction of the terminal hydroxyl groups.

Method used

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  • Siloxane preparation method and special venturi ejector

Examples

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Comparison scheme
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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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Abstract

The invention discloses a siloxane preparation method and a special venturi ejector, and relates to the technical field. The preparation method comprises the following steps: uniformly mixing hydroxyl-terminated polysiloxane, R a Si (OR ') (4-a) and an end-capping reaction catalyst under the protection of vacuum or inert gas, and then carrying out terminal alkoxylation in-situ end-capping reaction at 0-100 DEG C under the protection of the inert gas to obtain alkoxy-terminated polydimethylsiloxane. The preparation method provided by the invention is simple in step, simple and convenient to operate, mild in reaction condition, easy to implement and control and suitable for large-scale industrial popularization and production. The alkoxy-terminated polydimethylsiloxane prepared by the invention is not easy to condense in the storage process, the product quality is more stable and reliable, the shelf life is longer, and the stability of hydroxyl silicone oil and the high temperature resistance of silicone rubber can be effectively further improved.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a method for preparing siloxane and a special Venturi injector. Background technique [0002] Siloxane refers to compounds containing Si—O—Si bonds. [0003] Siloxane is divided into chain and ring. The general formula of chain is SinOn-1H2n+2, and the structure is H(SiH2-O)xSiH3; if n=2, it is disisiloxane, SiH3-O-SiH3; n =3, it is trisiloxane, SiH3-O-SiH2-O-SiH3; the general formula of ring is (H2SiO)n; if n=4, it is cyclotetrasiloxane, (H2SiO)4. Their halides are called halosiloxanes. Alkyl substitutes are organosiloxanes, known as silicones. [0004] Linear polydimethylsiloxane with hydroxyl end group, is an oily liquid with the characteristics of methyl silicone oil. Moreover, low-viscosity hydroxy silicone oil is an excellent structure control agent in silicone rubber processing, which can replace diphenylsilanediol, simplify the process, improve process perfo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/38B01J19/26B01J4/00
CPCC08G77/38B01J19/26B01J4/002
Inventor 张文峰林松
Owner 杭州四马化工科技有限公司
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