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Organosilicon antifoaming agent and preparation method thereof

A technology of organosilicon defoamer and emulsifier, applied in separation methods, chemical instruments and methods, foam dispersion/prevention, etc., can solve the problems of low surface energy, low defoaming effect of surface energy, inability to use, etc., and achieve improvement Defoaming and antifoaming effect, good defoaming and antifoaming effect, cost reduction effect

Inactive Publication Date: 2018-11-30
HUBEI XINGRUI SILICON MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above two types of defoamers are commonly used types of silicone defoamers. The main defoamer of these two types of silicone defoamers is polydimethylsiloxane. Although polydimethylsiloxane has a low surface energy, the defoaming effect is better, but there are still defoaming substances with lower surface energy and better defoaming effect, and the defoaming agent provided in CN106621480A has certain solubility in the oil phase system, so it cannot be used in oil Phase system

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) 90g of polytrifluoropropylmethylsiloxane and 5g of polydimethylsiloxane are placed in the reaction kettle, the viscosity of polytrifluoropropylmethylsiloxane is 500mPa.s, and the temperature setting at 120°C, with a stirring speed of 300r / min, then slowly add 5g of fumed silica (with a specific surface area of ​​150m 2 / g), stirred for 3h to obtain a silicone paste.

[0021] (2) Take the prepared 100g of silicone paste and put it in the reaction kettle, set the reaction temperature at 65°C, and compound Span-80 and Tween-80, wherein the mass of Span-80 is 42.5g, Tween-80 The mass of 80 is 27.5g. Slowly add the compounded emulsifier into the silicone oil. The rotation speed of the emulsifier is 3000r / min. After adding the emulsifier, slowly add 830g of water into the reaction kettle, and emulsify for 40min to obtain a silicone defoamer.

Embodiment 2

[0023] (1) 84g of polytrifluoropropylmethylsiloxane and 8g of polydimethylsiloxane are placed in the reaction kettle, the viscosity of polytrifluoropropylmethylsiloxane is 500mPa.s, and the temperature setting at 150°C, with a stirring speed of 300r / min, then slowly add 8g of fumed silica (with a specific surface area of ​​200m 2 / g), stirred for 3h to obtain a silicone paste.

[0024] (2) Take the prepared 100g of silicone paste and place it in the reaction kettle, set the reaction temperature to 70°C, and compound Span-80 and Tween-80, wherein the mass of Span-80 is 42.5g, Tween-80 The mass of 80 is 27.5g. Slowly add the compounded emulsifier into the silicone oil, and the rotation speed of the emulsifier is 3000r / min. After adding the emulsifier, slowly add 830g of water into the reaction kettle, and emulsify for 60min to obtain a silicone defoamer.

Embodiment 3

[0026] (1) Put 85g of polytrifluoropropylmethylsiloxane and 10g of polydimethylsiloxane in the reaction kettle, the viscosity of polytrifluoropropylmethylsiloxane and dimethyl silicone oil is 500mPa .s, the temperature is set to 120°C, the stirring speed is 300r / min, then slowly add 5g fumed silica (specific surface area is 150m 2 / g), stirred for 3h to obtain a silicone paste.

[0027] (2) Take the prepared 100g of silicone paste and put it in the reaction kettle, set the reaction temperature at 65°C, and compound Span-80 and Tween-80, wherein the mass of Span-80 is 42.5g, Tween-80 The mass of 80 is 27.5g. Slowly add the compounded emulsifier into the silicone oil, and the rotation speed of the emulsifier is 3000r / min. After adding the emulsifier, slowly add 830g of water into the reaction kettle, and emulsify for 40 minutes to obtain a silicone defoamer.

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Abstract

The invention provides an organosilicon antifoaming agent, which comprises the following ingredients (1000 parts by weight): 50-500 parts of poly[trifluoropropyl(methyl)siloxane], 0-100 parts of polydimethylsiloxane, 3-15 parts of white carbon black, 5-15 parts of an emulsifier, and the balance water. The organosilicon antifoaming agent is prepared by the following specific steps: mixing an organosilicon antifoaming component and white carbon black to obtain a silicon paste; and preparing an organosilicon antifoaming agent emulsion from the silicon paste, the emulsifier and water. The poly[trifluoropropyl(methyl)siloxane] has lower surface energy. Thus, in comparison with a regular antifoaming agent prepared from methylsilicone oil, the product has the following beneficial effects: with the addition of poly[trifluoropropyl(methyl)siloxane], surface tension of the antifoaming system is reduced, and defoaming and foam inhibition functions of the antifoaming agent are enhanced. As methylsilicone oil has certain dissolvability in an oil phase, the antifoaming agent is not easy to dissolve in the oil phase system with the addition of fluoroalkyl, and the use system range of the organosilicon antifoaming agent is broadened.

Description

technical field [0001] The invention relates to a defoamer and a preparation method thereof, in particular to an organosilicon defoamer and a preparation method thereof. Background technique [0002] In the production process of textile sizing, food fermentation, biomedicine, petroleum, chemical industry, paint and other industries, harmful foams are prone to be produced. If these harmful foams are not eliminated in time, the production efficiency and product quality will be seriously affected. The current defoaming methods mainly include physical and chemical methods. The physical method mainly includes changing the temperature of the foaming system, rapidly changing the pressure of the system, and causing a pressure difference on both sides of the foam liquid film. The chemical method is to add a defoamer to the system to achieve the effect of foam rupture by changing the surface film strength and surface film tension of the foam. Physical methods can only remove harmful...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D19/04
CPCB01D19/0404B01D19/0409
Inventor 蔡苗陈海平徐海露杜斌
Owner HUBEI XINGRUI SILICON MATERIAL CO LTD
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