Preparation method of organic silicon defoamer

A silicone defoamer and silicone oil technology, applied in separation methods, chemical instruments and methods, foam dispersion/prevention, etc., can solve problems such as delamination and defoamer instability, and achieve increased stability and acid resistance Alkaline properties, soothing strong hydrophobic and oleophobic effects

Active Publication Date: 2017-12-15
GUANGDONG REBON ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention: Aiming at the problem that the current defoamer simply mixes the silicone defoamer and the polyether defoame

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0019] A preparation method of organosilicon defoamer, the preparation method includes the following steps:

[0020] (1) In parts by weight, take 80 to 90 parts of silicone oil, 30 to 35 parts of linolenic acid, 20 to 25 parts of methyl vinyl dichlorosilane, 8 to 11 parts of maleic anhydride, 4 to 7 parts of catalyst and 1 ~3 parts of additives, first put silicone oil, linolenic acid and additives into the reactor, protect with nitrogen, and preheat at 60~65℃ for 30~35min;

[0021] (2) After preheating, add methyl vinyl dichlorosilane, maleic anhydride, and catalyst, heat up to 90-95°C for reaction for 2 to 4 hours, cool, and collect the reaction mixture;

[0022] (3) Put the reaction mixture, allyl polyoxyethylene ether and xylene into the reaction kettle at a mass ratio of 8-11:3-5:13, adjust the pH to 8.0-8.5 with sodium hydroxide solution, and use Increase the pressure of carbon dioxide to 1.2~1.5MPa, stir at 80~95℃ for 1~3h:

[0023] (4) After the stirring is over, add emulsifie...

Example Embodiment

[0024] Example 1

[0025] The choice of catalyst is aluminum silicate.

[0026] The choice of additive is phosphomolybdic acid.

[0027] The choice of emulsifier is calcium stearoyl lactate.

[0028] A preparation method of organosilicon defoamer, the preparation method includes the following steps:

[0029] (1) In parts by weight, take 85 parts of silicone oil, 33 parts of linolenic acid, 23 parts of methyl vinyl dichlorosilane, 10 parts of maleic anhydride, 5 parts of catalyst and 2 parts of additives. The additives are put into the reactor, protected by nitrogen, and preheated at 63℃ for 33min;

[0030] (2) After preheating, add methyl vinyl dichlorosilane, maleic anhydride, and catalyst, heat up to 93°C for reaction for 3 hours, cool, and collect the reaction mixture;

[0031] (3) According to the mass ratio of 9:4:13, put the reaction mixture, allyl polyoxyethylene ether and xylene into the reaction kettle, use sodium hydroxide solution to adjust the pH to 8.3, and use carbon dioxid...

Example Embodiment

[0033] Example 2

[0034] The choice of the catalyst is either aluminum silicate or Lewis acid.

[0035] The choice of additives is any one of titanium dioxide and phosphomolybdic acid.

[0036] The choice of emulsifier is either sodium stearoyl lactate or calcium stearoyl lactate.

[0037] A preparation method of organosilicon defoamer, the preparation method includes the following steps:

[0038] (1) In parts by weight, take 90 parts of silicone oil, 35 parts of linolenic acid, 25 parts of methyl vinyl dichlorosilane, 11 parts of maleic anhydride, 7 parts of catalyst and 3 parts of additives. The additives are put into the reactor, protected by nitrogen, and preheated at 65°C for 35 minutes;

[0039] (2) After preheating, add methyl vinyl dichlorosilane, maleic anhydride, and catalyst, heat up to 95°C for reaction for 4 hours, cool, and collect the reaction mixture;

[0040] (3) According to the mass ratio of 11:5:13, put the reaction mixture, allyl polyoxyethylene ether and xylene int...

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PUM

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Abstract

The invention belongs to the technical field of chemical engineering and particularly relates to a preparation method of an organic silicon defoamer. The preparation method comprises the following steps: by taking silicone oil as a base material, modifying the silicone oil by using a methyl vinyl dichlorosilane monomer to increase silicon oxygen bonds in the silicone oil; then performing protection by using maleic anhydride to increase the acid and alkali resistance; and then performing a grafting reaction with allyl polyoxyethylene ether to form the polyether modified organic silicon defoamer. Under the action of ammonium glycyrrhetate, the hydrophobic and lipophobic properties of the defoamer are alleviated, the stability is enhanced, and a layering phenomenon of the defoamer is prevented.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a preparation method of an organosilicon defoamer. Background technique [0002] Defoamer is a widely used fine chemical, mainly used to eliminate and suppress various harmful foams. As a defoaming agent, it should have basic characteristics such as insoluble or insoluble in the foaming liquid, lower surface tension than the foaming liquid, certain affinity with the foaming liquid, no chemical reaction with the foaming liquid, and low volatility. . There are many types of defoamers, and those commonly used in industry can be roughly divided into three categories: organic defoamers (alcohols, lipids, amides, etc.), silicone defoamers and polyether defoamers. Among them, silicone and polyether defoamers are the most widely used and used in large amounts. Silicone defoamers have attracted widespread attention due to their insoluble properties, low surface te...

Claims

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Application Information

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IPC IPC(8): B01D19/04
CPCB01D19/0409
Inventor 王秀凤刘芳尹凯欣
Owner GUANGDONG REBON ADVANCED MATERIALS CO LTD
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