Method for eliminating phenomena that organic silicon crude monomer hydrolysate is not layered and adhered to equipment

A technology of organosilicon and hydrolyzate, applied in recycling technology, plastic recycling, etc., can solve the problem of non-stratification of organosilicon crude monomer hydrolyzate, and achieve the effects of reducing production costs, high safety factor, and low reaction temperature

Active Publication Date: 2019-06-14
SHANDONG DONGYUE ORGANIC SILICON MATERIAL
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] At present, although most manufacturers reduce the formation of monomers or oligomers containing three or more silicon-chlorine bonds by controlling the production process and other methods in the production process of silicone monomers, the crude silicone caused by improper operation Cases of monomer hydrolyzates not delaminating and sticking to hydrolysis equipment still exist

Method used

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  • Method for eliminating phenomena that organic silicon crude monomer hydrolysate is not layered and adhered to equipment
  • Method for eliminating phenomena that organic silicon crude monomer hydrolysate is not layered and adhered to equipment
  • Method for eliminating phenomena that organic silicon crude monomer hydrolysate is not layered and adhered to equipment

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Experimental program
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Effect test

Embodiment 1-9

[0031] Add a certain amount of potassium hydroxide to the crude monomer hydrolyzate of dimethyldichlorosilane (adhesive state where water and oil are not layered), stir for 30 minutes, then add 90wt% toluene, heat up, and reflux at 130°C Take water for 2 hours, remove part of the water, and then let it stand to observe the stratification of the hydrolyzate and the adhesion of the equipment.

[0032] The potassium hydroxide consumption of embodiment 1-9, hydrolyzate delamination situation and adhesion equipment situation are as shown in table 1:

[0033] The potassium hydroxide consumption of table 1 embodiment 1-9, hydrolyzate delamination situation and adhesion equipment situation

[0034]

[0035] Under the same reflux time, such as 2h, the amount of alkali has an important influence on the non-stratification of water and oil. It can be seen from Table 1 that when the amount of potassium hydroxide is less than 5%, the breakage of the silicon-oxygen-silicon bond cannot be...

Embodiment 10-18

[0037] Add 15wt% potassium hydroxide to the crude monomer hydrolyzate of methylethyldichlorosilane (adhesive state in which water and oil do not delaminate), stir for 30 minutes, then add a certain amount of toluene, heat up, at 130°C Reflux with water for 2 hours, remove part of the water, and then let it stand to observe the stratification of the hydrolyzate and the adhesion of the equipment.

[0038] The toluene consumption of embodiment 10-18, hydrolyzate delamination situation and adhesion equipment situation are as shown in table 2:

[0039] The toluene consumption of table 2 embodiment 10-18, hydrolyzate delamination situation and adhesion equipment situation

[0040]

[0041] Under the same reflux time condition, such as 2h, when the amount of toluene is not the same, there is a significant difference in the layering speed. As can be seen from Table 2, when the amount of toluene is lower than 40%, the phenomenon of non-stratification of water and oil still exists o...

Embodiment 19

[0043] Add 10wt% sodium hydroxide to the crude monomer hydrolyzate of methylpropyldichlorosilane (a liquid state in which water and oil are not separated), stir for 20 minutes, then add 70wt% toluene, heat up, and reflux at 135°C Carry water, remove part of the water, and after standing still, the water and oil two-phase layer will separate; take the oil layer and carry out vacuum distillation under the conditions of 70 ° C and -0.098 MPa to remove toluene to obtain transparent silicone oil, which can be reused after recovery of toluene.

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Abstract

The invention relates to the technical field of organic silicon hydrolysis, in particular to a method for eliminating the phenomena that an organic silicon crude monomer hydrolysate is not layered andadhered to equipment. The method comprises the following steps: adding a strong alkali into the organic silicon crude monomer hydrolysate, stirring, adding an organic solvent, heating, refluxing withwater, and standing to realize water-oil two-phase layering, wherein the organic silicon crude monomer comprises an organic silicon monomer, a by-product containing two silicon-chlorine bonds, and amonomer or oligomer containing three or more silicon-chlorine bonds; a structural general formula of the organic silicon monomer and the by-product containing two silicon-chlorine bonds is R1R2SiCl2,wherein R1 and R2 are alkyl or phenyl; and the hydrolysate is in a liquid state or an adhesion state in which water and oil are not layered. The method disclosed by the invention is simple to operate,low in reaction temperature, normal pressure and high in safety coefficient, eliminates the phenomenon that the organic silicon crude monomer hydrolysate is not layered, enables the polymer adhered to the equipment to be separated from the equipment, and solves the problem that the device is difficult to clean.

Description

technical field [0001] The invention relates to the technical field of organosilicon hydrolysis, in particular to a method for eliminating the phenomena of non-stratification and adhesion to equipment of organosilicon crude monomer hydrolyzate. Background technique [0002] In the production process of organosilicon monomers, the crude monomers produced include organosilicon monomers and by-products, among which the hydrolyzed substances of organosilicon monomers and by-products containing two silicon-chlorine bonds all exhibit the phenomenon of water-oil separation , the upper oil phase is a colorless and transparent substance, which can be cracked to obtain a ring body; while the hydrolyzed substance of a monomer or oligomer containing three or more silicon-chloride bond structures is in the form of an emulsion, which is difficult to separate from water and oil layer, and even stick to the hydrolysis equipment. [0003] If the crude monomer contains three or more silicon-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/00C08J11/06C08L83/04
CPCY02W30/62
Inventor 伊港胡庆超李云杰国建强孙江
Owner SHANDONG DONGYUE ORGANIC SILICON MATERIAL
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