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Preparation method of organic silicon defoamer with high stability

A silicone defoamer and high stability technology, which is applied in the field of preparation of defoaming and antifoaming products, can solve the problems of poor defoaming and antifoaming performance, large amount of stabilizer, and easy chain breakage of siloxane, etc., to achieve improved Foam suppression performance, stability improvement, good stability effect

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

[0035] Preparation of Silicone Composition A:

[0036] Mix polyorganosiloxane A(1), A(2) and silicone resin A(4) in a mixer, heat up to 80°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 100°C for 3h, then further raise the temperature to 210°C, and react for 1h; At room temperature, silicone composition A was obtained.

[0037] in:

[0038] A(1) polyorganosiloxane:

[0039] 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 40 parts in silicone composition A.

[0040] A(2) polyorganosiloxane:

[0041] 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 occupies 65 parts in silicone composition A.

[0042]...

Embodiment 1

[0053] A kind of high-stability organosilicon defoamer, by weight, is made up of following raw material:

[0054] 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 (vinyl trimethyl Oxysilane), 2 parts of thickener E (polyacrylic acid), 60 parts of water.

[0055] The preparation method of high stability silicone defoamer is:

[0056] (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;

[0057] (2), keep the temperature constant, add 30% water and 90% thickener E while stirring, and adjust the pH to 6.5;

[0058] (3) Pass the above emulsion through a colloid mill, then add coupling agent D, and stir at 80°C for 10 minutes;

[0059] (4) Dilute with the remaining amount of thickener E and water to obtain a defoamer.

Embodiment 2

[0061] A kind of high-stability organosilicon defoamer, by weight, is made up of following raw material:

[0062] 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 (vinyl triethyl Oxysilane), 10 parts of thickener E (carbomer), 30 parts of water.

[0063] The preparation method of high stability silicone defoamer is:

[0064] (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;

[0065] (2), keep the temperature constant, add 60% water and 70% thickener E while stirring, and adjust the pH to 7.0;

[0066] (3), pass the above emulsion through a colloid mill, then add coupling agent D, and stir at 50°C for 30 minutes;

[0067] (4) Dilute with the remaining amount of thickener E and water to obtain a defoa...

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Abstract

The invention relates to a defoaming and foam inhibiting product for chemical industry, in particular to a preparation method of an organic silicon defoamer with high stability. The organic silicon defoamer is prepared from an organic silicon composition A, polyether-modified polysiloxane B, an emulsifier C, a coupling agent D, a thickener E and water, wherein the coupling agent D is selected from vinyl trimethoxy silane and vinyltriethoxysilane. The preparation method comprises the steps that the organic silicon composition A, polyether-modified polysiloxane B and the emulsifier C are mixed, and then heating stirring is conducted; the temperature keeps invariable, 30%-60% of water and 70%-90% of the thickener E are added while stirring is conducted, and the pH is regulated; the emulsion passes through a colloid mill, the coupling agent D is added, and stirring is conducted; dilution is conducted with the remaining thickener E and the remaining water, and the defoamer is obtained. According to the defoamer emusion product, the emulsion stability is significantly improved, so that the defoamer achieves the good stability under the extreme conditions such as strong acid and strong alkali, the durability of the defoamer is improved, and meanwhile the defoamer is not prone to be separated out.

Description

technical field [0001] The invention relates to a preparation method of a defoaming and antifoaming product suitable for the chemical industry, in particular to a preparation method of a high-stability organic silicon defoamer. 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 transportatio...

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
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