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Preparation method of polyether-modified organic silicon defoaming agent

A technology of polyether modification and defoaming agent, which is applied in the direction of foam dispersion/prevention, which can solve the problems of reducing the proportion of silicone and the impact of copolymer performance, and achieves improved safety, good alkali resistance, and good foam suppression performance Effect

Inactive Publication Date: 2013-05-01
LIAONING UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

Similarly, changing the relative molecular mass of the polyether segment will increase or decrease the proportion of silicone in the molecule, which will also affect the properties of the copolymer

Method used

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  • Preparation method of polyether-modified organic silicon defoaming agent

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Embodiment Construction

[0024] 1. Polyether polymer preparation examples

[0025]

[0026] The above-mentioned components are loaded into a reactor, which is equipped with a condenser, a nitrogen input pipe, a thermometer and a stirrer. Then, the temperature is increased to 90-100°C under nitrogen atmosphere, and the copolymerization reaction is carried out continuously for 2-4 hours under the protection of nitrogen.

[0027] After the reaction, the toluene was distilled out under reduced pressure at 100°C to obtain a light yellow viscous liquid copolymer.

[0028] The obtained copolymer is hydrolyzed in a 5% NaOH aqueous solution at a temperature of 70° C. for 1-1.5 h to obtain a defoamer hydrolyzate.

[0029] 2. Preparation example of polyether modified organosiloxane defoaming agent

[0030] In a four-necked flask, put the hydrogen-containing silicone oil and the polyether polymer obtained in Example 1 in a ratio of 1:1.5, vacuum dehydration to a water content ≤0.1%, and add 25% of the total mass of the sy...

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Abstract

The invention relates to a polyether-modified organic silicon polymer defoaming agent which is characterized in that a polymer uses polyether obtained by carrying out polymerization reaction on maleic anhydride, crylic acid, diacetone acrylamide and some straight-chain alkenyl ether to carry out graft modification on organic siloxane. A preparation method of the defoaming agent comprises the following steps: firstly carrying out free radical reaction on the maleic anhydride, the crylic acid, the diacetone acrylamide and the straight-chain alkenyl ether with 8-20 oxyalkylene units to obtain the polyether polymer and then carrying out graft reaction on the organic siloxane through polyether under the catalysis of platinum to obtain the polyether-modified organic silicon polymer defoaming agent. The polyether-modified organic silicon polymer defoaming agent has the benefits that polyether-modified polysiloxane can be directly used for defoaming without adding any aid and compounding, the defoaming performance and the foam inhibiting performance are good, and the polyether-modified organic silicon polymer defoaming agent can be quickly dissolved into water, is good in stability, can not generate precipitation and has good application prospect.

Description

Technical field [0001] The invention relates to a defoaming agent. Specifically, the present invention is a polymer used to remove harmful foams generated in the production process of petrochemical, papermaking, latex, textile, food, biomedicine, coating industry cleaning and other industries. The polymer has low surface tension and is chemically stable. High performance, fast defoaming speed, long foam suppression time, no physiological toxicity, and has the advantages of both silicone defoamer and polyether defoamer. Background technique [0002] With the continuous development of industrial production and increased environmental governance, varieties of defoamers continue to appear. Among them, polysiloxane defoamers have stable chemical properties, fast defoaming speed, long foam suppression time, and no physiological toxicity. , Wide application range and other characteristics are favored by people. However, it has disadvantages such as not resistant to high temperature, st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D19/04C08G81/02C08F222/06C08F216/14C08F220/58C08F220/06
Inventor 吴宪龙张震斌
Owner LIAONING UNIVERSITY OF TECHNOLOGY
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