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A kind of preparation method of high temperature resistant strong alkali defoamer

A technology of high temperature resistance and alkali elimination, which is applied in separation methods, chemical instruments and methods, foam dispersion/prevention, etc., can solve the problems of losing the bubble-stimulating effect, achieve increased dispersion, long-lasting defoaming performance, and good application prospects Effect

Active Publication Date: 2017-05-10
XIAN SUNY FINE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, under the environment of high temperature and strong alkali, the dispersed white carbon black will react with the strong alkali quickly, thus losing the bubble-stimulating effect.

Method used

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  • A kind of preparation method of high temperature resistant strong alkali defoamer

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preparation example Construction

[0025] The preparation method of high temperature resistant strong alkali defoamer of the present invention comprises the following steps:

[0026] 1) Synthesis of network structure polymer: Vinyl MQ silicone resin (vinyl content is 2% to 5%, MQ ratio is 0.6 to 1.0) and hydrogen-containing silicone oil (hydrogen content is 0.1% to 0.36%, viscosity 200~500cst) mixed with mass ratio (1:1)~(1:1.3) into the reaction kettle, heated while stirring in nitrogen atmosphere, when the temperature rose to 100℃, slowly added dropwise chloroplatinic acid catalyst (the amount of chloroplatinic acid catalyst added is 0.1% to 0.3% of the total mass of MQ silicone resin and hydrogen-containing silicone oil) for reaction, and kept at 110°C to 130°C for 2 to 4 hours to obtain a viscous network Shaped polymers;

[0027] 2) Preparation of high temperature resistant strong alkali silicone paste: 20% to 50% of the network structure polymer prepared in step 1) and 5% to 10% of white carbon black (pow...

Embodiment 1

[0032] Add 150 grams of vinyl MQ silicone resin with a vinyl content of 4% and an MQ ratio of 0.8, 200 grams of hydrogen-containing silicone oil with a hydrogen content of 0.1% and a viscosity of 200 cst in a 1L reactor, and heat to 100°C. In a nitrogen atmosphere, 0.35 g of chloroplatinic acid catalyst was slowly added dropwise, and the temperature of the reaction system was slowly raised to 120° C.; at this temperature, a viscous liquid was obtained after 3 hours of reaction, which was a network structure polymer.

[0033] Then add the above-mentioned 445 grams of network structure polymer, 50 grams of white carbon black with a specific surface area of ​​270 and a hydrophobicity of 35, 300 grams of simethicone oil with a viscosity of 60000CST and dimethyl silicone oil with a viscosity of 500CST in the reactor. 200 grams of silicone oil, 5 grams of sodium hydroxide catalyst, heated to 140 ° C, and kept at 140 ° C for 5 hours to obtain a viscous mixture that is silicone paste. ...

Embodiment 2

[0036] Add 150 grams of vinyl MQ silicone resin with a vinyl content of 2% and an MQ ratio of 1.0, 150 grams of hydrogen-containing silicone oil with a hydrogen content of 0.15% and a viscosity of 300 cst in a 1L reactor, and heat to 100°C. In a nitrogen atmosphere, 0.60 g of chloroplatinic acid catalyst was slowly added dropwise, and the temperature of the reaction system was slowly raised to 110° C.; at this temperature, a viscous liquid was obtained after the reaction was kept for 4 hours, which was a network structure polymer.

[0037] Then add 200 grams of the above-mentioned network structure polymer, 100 grams of white carbon black with a specific surface area of ​​200 and a hydrophobicity of 50, 440 grams of simethicone oil with a viscosity of 10000CST and dimethyl silicone oil with a viscosity of 2000CST in the reactor. 250 grams of silicone oil, 10 grams of sodium hydroxide catalyst, heated to 135 ° C, and kept at 135 ° C for 3 hours to obtain a viscous mixture that i...

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Abstract

The invention discloses a preparation method of a defoaming agent resistant to high temperature and strong alkali. The defoaming agent is prepared through the steps of firstly, synthesizing polymer of a mesh-shaped structure; secondly, preparing silicon paste resistant to high temperature and strong alkali; thirdly, preparing the defoaming agent resistant to high temperature and strong alkali. Vinyl MQ silicon resin and low-hydrogen-content silicone oil react under the catalytic effect of chloroplatinic acid to obtain the polymer of the mesh-shaped structure; dimethicone and white carbon black which are of different degrees of viscosity are added into a reaction kettle to obtain silicon paste under the catalytic effect of strong alkali; an emulsifying agent, a dispersing agent and other auxiliaries are added to be emulsified into the defoaming agent resistant to high temperature and strong alkali. By means of the defoaming agent prepared through the method, the problem that silicon resin is not prone to dispersing in the ordinary silicon paste preparation process is solved, and the silicon paste which is of the mesh-shaped structure and resistant to high temperature and strong alkali has stronger anti-foaming performance compared with traditional silicon paste. The prepared emulsion has excellent foam eliminating and restraining performance and high temperature and strong alkali resistance, and the defoaming agent can be widely applied to multiple fields of papermaking, chemical fiber, oil fields and the like, and has good application prospects.

Description

technical field [0001] The invention relates to a preparation method of a high-temperature resistant strong alkali defoamer, belonging to the field of defoamer preparation. Background technique [0002] At present, the silicone paste prepared by dispersing hydrophobic fumed silica in polydimethylsiloxane through a kneader at a certain temperature, due to the synergistic effect of silica and polydimethylsiloxane , To a certain extent, it increases the defoaming performance of the defoamer. However, under the environment of high temperature and strong alkali, the dispersed white carbon black will react with the strong alkali quickly, thus losing the bubbling effect. Through the condensation reaction of MQ silicone resin and fumed silica, the silica and MQ silicone resin are linked by chemical bonds and dispersed in polysiloxane, which is not easy to fail quickly even in high temperature and strong alkali environment. [0003] Secondly, the silicone paste prepared by mixing h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D19/04
CPCB01D19/0409
Inventor 高源宋蕊马增超郭睿刘运航陈小寒马天天田建涛
Owner XIAN SUNY FINE CHEM
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