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High-temperature and strong alkali organic silicon antifoamer emulsion composition and preparing method thereof

A technology of emulsion composition and defoamer, which is applied in the direction of foam dispersion/prevention, can solve the problems of prolonged action time of defoamer, difficulty of foam control compound, unsatisfactory use effect, etc., and achieve simplification of emulsification equipment and stability of emulsion And the effect of good shear resistance and cost reduction

Inactive Publication Date: 2005-02-23
JIANGSU SIXIN SCI-TECH APPL RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is very difficult to prepare the foam control compound in the present invention according to the above-mentioned traditional method, and it is very time-consuming, and the equipment investment is very expensive in addition
At present, most silicone emulsion defoamers at home and abroad have unsatisfactory use effects in this field, and the use cost is relatively high
If it is difficult to prolong the action time of the defoamer by using common methods

Method used

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  • High-temperature and strong alkali organic silicon antifoamer emulsion composition and preparing method thereof
  • High-temperature and strong alkali organic silicon antifoamer emulsion composition and preparing method thereof
  • High-temperature and strong alkali organic silicon antifoamer emulsion composition and preparing method thereof

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Experimental program
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Effect test

Embodiment 1

[0043] Preparation of defoamer emulsion composition:

[0044] In a 5L vacuum kneader, add 1750g of trimethylsilyl-terminated polydimethylsiloxane with a viscosity of 150,000cst, 100g of silicon dioxide (Shenyang A-150) and 30g of monomethyltriethoxysilane, and knead fully After making the system uniform, start heating, and when the temperature of the reaction system reaches 135-140°C, add 120g of catalyst to it, keep warm and start vacuuming and maintain a certain degree of vacuum (0.05-0.06MPa). This process lasts for 3.5 hours. The catalyst is prepared by reacting 108g octamethylcyclotetrasiloxane and 12g KOH at 140°C for 15min. Finally, react for another 3 hours at 160° C. and a vacuum of 0.05-0.06 MPa to remove unreacted substances and reaction by-products. Cool to room temperature to obtain a white paste defoamer emulsion composition.

[0045] Emulsion preparation:

[0046] Add powdery 150g polyoxyethylene stearate (40mol) and 200g monoglyceride (molecular distillation...

Embodiment 2

[0050] In a 5L vacuum kneader, add 1750g of trimethylsilyl-terminated polydimethylsiloxane with a viscosity of 300,000cst, 100g of silicon dioxide (Shenyang A-150) and 90g of hexamethyldisiloxane, and knead fully to make After the system is uniform, start heating, and when the temperature of the reaction system reaches 135° C., add 60 g of catalyst to it, keep warm and start vacuuming and maintain a certain degree of vacuum (0.05-0.06 MPa). This process lasts for 8 hours. The catalyst was prepared by reacting 45 g of trimethylsilane-terminated polymerized dimethylsiloxane (1,000 cst) with 5 g of KOH at 140° C. for 15 min. Finally, react for another 0.5 h at 160° C. and a vacuum of 0.05-0.06 MPa to remove unreacted substances and reaction by-products. Cool to room temperature to obtain a white paste foam control composition.

[0051] emulsion preparation

[0052] Add 140g of powdered Tween 60 and 220g of Span 60 to the foam control composition prepared above, knead thoroughly...

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Abstract

A composite organosilicon emulsion as defoaming agent with resistance to high temp and strong alkali is prepared from the polydimethyl siloxane terminated by trisilane group, at least one hydrophilic particle of inorganic metal oxide, a modifier for making the surface of said particle hydrophibic, and a catalyst.

Description

Technical field: [0001] The present invention relates to an emulsion-type defoamer based on high-viscosity siloxane, or more specifically relates to a high-viscosity siloxane which works in a high-temperature and strong alkali environment and has excellent anti-foaming and anti-foaming activities. The invention discloses an emulsion type defoamer with alkane as the main foam control composition and a preparation method thereof. It belongs to the technical field of chemical composition and its preparation. Background technique [0002] The invention relates to an emulsion-type defoamer with high-viscosity siloxane as a base agent and a preparation method thereof. Liquid foaming is, to a large extent, a serious problem in many industrial processes. In industry, foam is usually eliminated by using a treatment agent or adding a liquid that can defoam itself. The foam generated by the liquid greatly reduces the efficiency of critical processing processes, while also compromisi...

Claims

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Application Information

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IPC IPC(8): B01D19/04
Inventor 曹治平张忠均
Owner JIANGSU SIXIN SCI-TECH APPL RES INST CO LTD
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