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Organosilicon defoaming agent

A silicone defoamer and silicone technology, applied in the direction of foam dispersion/prevention, chemical instruments and methods, liquid degassing, etc., can solve the problem of poor defoaming performance, large amount of stabilizer, and easy breakage of silicone Chain and other problems, to achieve the effect of improving foam suppression performance, improving stability, and good stability

Inactive Publication Date: 2016-12-14
合肥普庆新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it still cannot solve the problem that siloxane is easy to break the chain in the strong acid-base system, and has poor applicability in the strong base system
Patent CN103074784 provides a method of using starch as a stabilizer to improve the acid and alkali resistance of the emulsion, but due to the large amount of stabilizer used, the defoaming performance is deteriorated
CN103603215A provides a preparation method of an organic silicon defoamer of an acid and alkali resistant system, which mainly compares the influence of the addition order of hydrophilic and lipophilic emulsifiers on the stability of the emulsion and acid and alkali resistance. After the agent and the silicone composition are mixed and stirred evenly, adding a hydrophilic emulsifier can improve the emulsion stability and acid and alkali resistance, but this process cannot fundamentally effectively solve the problem of acid and alkali resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0033] Preparation of Silicone Composition A:

[0034] Mix polyorganosiloxane A(1), A(2) and silicone resin A(4) in a mixer, heat up to 100°C, add catalyst A(5), and polymerize; when the mixture reaches a certain viscosity Add silicon dioxide A (3) as a hydrophobic treatment agent, react at 80°C for 5h, then further raise the temperature to 200°C, and react for 2h; At room temperature, silicone composition A was obtained.

[0035] in:

[0036] A(1) polyorganosiloxane:

[0037] Polyorganosiloxane A(1) is trimethylsiloxy-terminated polydimethylsiloxane, and the polyorganosiloxane has a dynamic viscosity of 1000-300000mPa.s at 25°C; A(1 ) Polyorganosiloxane occupies 20 parts in silicone composition A.

[0038] A(2) polyorganosiloxane:

[0039] Polyorganosiloxane A(2) is hydroxyl-terminated polydimethylsiloxane, and the polyorganosiloxane has a dynamic viscosity of 1000-200000mPa.s at 25°C; A(2) polyorganosiloxane Alkane accounts for 50 parts in silicone composition A.

[004...

Embodiment 1

[0051] A kind of organosilicon defoamer, by weight, is made up of following raw material:

[0052] 5 parts of silicone composition A, 30 parts of polyether modified polyorganosiloxane B, 2 parts of emulsifier C (nonylphenol polyoxyethylene ether), 0.1 part of coupling agent D (methyl trimethyl Oxysilane), 2 parts of thickener E (polyacrylic acid), 60 parts of water.

[0053] The preparation method of organosilicon defoamer is:

[0054] (1) Mix the silicone composition A, the polyether-modified polyorganosiloxane B and the emulsifier C, then raise the temperature to 50° C., stir for 1.5 hours, and the stirring speed is 100 rpm;

[0055] (2), keeping the temperature constant, add 60% water, 70% thickener E and coupling agent D while stirring, and adjust the pH to 7.0;

[0056] (3) Homogenize the above-mentioned emulsion through a colloid mill, and dilute with the remaining amount of thickener E and water to obtain a defoamer.

Embodiment 2

[0058] A kind of organosilicon defoamer, by weight, is made up of following raw material:

[0059] 30 parts of silicone composition A, 10 parts of polyether modified polyorganosiloxane B, 10 parts of emulsifier C (polyoxyethylene palmitic acid ether), 0.01 parts of coupling agent D (methyl triethyl Oxysilane), 10 parts of thickener E (carbomer), 30 parts of water.

[0060] The preparation method of organosilicon defoamer is:

[0061] (1) Mix the silicone composition A, the polyether-modified polyorganosiloxane B and the emulsifier C, then raise the temperature to 80°C, stir for 0.5h, and the stirring speed is 400rpm;

[0062] (2), keeping the temperature constant, add 30% water, 90% thickener E and coupling agent D while stirring, and adjust the pH to 6.5;

[0063] (3) Homogenize the above-mentioned emulsion through a colloid mill, and dilute with the remaining amount of thickener E and water to obtain a defoamer.

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Abstract

The invention relates to a defoaming foam-depressing product for chemical industry, in particular to an organosilicon defoaming agent, composed of, by weight: 5-30 parts of organosilicon composition A, 10-20 parts of polyether modified polysiloxane, 2-10 parts of emulsifier C, 0.01-0.1 part of coupling agent d, 2-10 parts of thickener E and 30-60 parts of water; the coupling agent D is selected from methyltrimethoxysilane, methyltriethoxysilane, aminotrimethoxysilane or aminotriethoxysilane; the organosilicon defoaming agent provides significantly improved stability for emulsion, the emulsion has good stability in extreme conditions such as strong acid and strong alkali, durability of the defoaming agent is improved, and the defoaming agent rarely separates out.

Description

technical field [0001] The invention relates to a defoaming and antifoaming product suitable for the chemical industry, in particular to an organic silicon defoaming agent. Background technique [0002] Defoamers, also known as defoamers, reduce surface tension during processing, inhibit foam generation or eliminate foam that has already occurred. The defoamers approved for use in my country include silicone emulsion type, high-carbon alcohol fatty acid ester compound, polyoxyethylene polyoxypropylene pentaerythritol ether, polyoxyethylene polyoxypropylene alcohol amine ether, polyoxypropylene glyceryl ether and polyoxypropylene Polyoxyethylene glyceryl ether, polydimethylsiloxane, etc. Silicone emulsion-type defoamers are widely used in industrial production due to their fast defoaming. However, since the emulsion is a metastable system, phenomena such as demulsification and delamination often occur during transportation and use, which seriously affect the product. Quality...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D19/04
CPCB01D19/0409
Inventor 侯伟何宗文
Owner 合肥普庆新材料科技有限公司