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Organic silicon defoaming agent and preparing method thereof

A silicone defoamer and silicon paste technology, applied in separation methods, chemical instruments and methods, foam dispersion/prevention, etc., can solve the problems of high viscosity of silicon paste, long time of silicon paste, high temperature, and prevent delamination. , Easy to emulsify and improve the effect of foam breaking ability

Inactive Publication Date: 2019-07-30
HUBEI HUIFU NANOMATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It takes a long time to prepare silicone paste, high temperature, high energy consumption, high viscosity of silicone paste, which is not conducive to later emulsification

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Mix modified silica ① and polydimethylsiloxane with a viscosity of 500cp at a mass ratio of 8:100 at 100°C for 1 hour at a speed of 1000r / m to prepare a silicone paste with a viscosity of 2000cp. Take 36g of the above-mentioned silicone paste and polydimethylsiloxane with a viscosity of 500cp and mix them evenly at a ratio of 1.2:1, then add 27g of water and 12g of a composite emulsifier with an HLB value of 10, control the speed at 500r / min, mix evenly and heat up to 45°C , add 110g of water and 8g of PVA, and stir for 1h to obtain silicone defoamer Ⅰ.

Embodiment 2

[0032] Mix modified silica ②, hexamethyldisilazane, and polydimethylsiloxane with a viscosity of 500cp at a mass ratio of 10:0.2:100 at 100°C for 2 hours at a speed of 1000r / m. A silicone paste with a viscosity of 20000cp was prepared. Take 30g of the above-mentioned silicone paste and polydimethylsiloxane with a viscosity of 100cp and mix them evenly at a ratio of 1.5:1, then add 50g of water and 30g of a composite emulsifier with an HLB value of 7, control the speed at 500r / min, mix evenly and heat up to 45°C , add 100g of water and 5g of PVA aqueous solution, and stir for 1h to obtain silicone defoamer II.

Embodiment 3

[0034]Mix modified silica ③, hexamethyldisilazane, and polydimethylsiloxane with a viscosity of 100cp at a mass ratio of 10:1:100 at 100°C for 3 hours at a speed of 1000r / m. A silicone paste with a viscosity of 150,000 cp was prepared. Take 50g of the above-mentioned silicone paste and polydimethylsiloxane with a viscosity of 100cp and mix them uniformly at a ratio of 1.5:1, then add 100g of water and 20g of a composite emulsifier with an HLB value of 10, control the speed at 1000r / min, mix well and then heat up to 45°C , add 100g of water and 5g of PVA aqueous solution, and stir for 2h to obtain silicone defoamer III.

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PUM

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Abstract

The invention discloses an organic silicon defoaming agent and a preparing method thereof. The organic silicon defoaming agent is prepared from, by weight, 20-50 parts of polydimethylsiloxane, 1-10 parts of fumed silica, 2-15 parts of an emulsifying agent, 1-10 parts of a thickening agent and 30-80 parts of water; the fumed silica is surface-modified fumed silica, and the surface of the fumed silica is wrapped with a -Si-R3 group, wherein R is one or more of CH3, O-Si-(CH2)-OH, (Si(CH2))n-CH3. When the organic silicon defoaming agent is prepared, the fumed silica, parts of polydimethylsiloxaneand a silane coupling agent are mixed to prepare silicon paste with the viscosity of 500 cp to 200,000 cp; then the silicon paste, water, the emulsifying agent and the polydimethylsiloxane are mixed;finally, the thickening agent and the water are added, stirring is conducted, and the organic silicon defoaming agent is obtained. According to the organic silicon defoaming agent and the preparing method thereof, a silicon-paste midbody with the adjustable viscosity can be prepared, and a phenomenon that the silicon paste is over thin or over thick can be avoided; meanwhile, by introducing different pieces of hydrophobic fumed silica, and the defoaming performance and the foam inhibition performance of the defoaming agent can be effectively controlled; a preparing condition is mild, and operation is convenient.

Description

technical field [0001] The invention belongs to the technical field of defoamers, and in particular relates to a silicone defoamer and a preparation method thereof. Background technique [0002] In the production process of textile sizing, food fermentation, biomedicine, petroleum, chemical industry, coatings and other industries, foams are easily generated. Silicone defoaming agent has strong defoaming ability, good thermal stability, physiological and chemical inertness, non-toxic and harmless , No secondary pollution and other characteristics are widely used. The generation of foam is mainly due to the existence of surfactants. The main methods of chemical defoaming are (1) the defoamer contains low surface tension components, which can reduce the surface tension of the foam; (2) the defoamer can effectively enter the membrane surface and destroy the membrane. Elasticity; (3) Hydrophobic solid particles are added to the defoamer to combine with the surfactant; (4) The de...

Claims

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Application Information

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IPC IPC(8): B01D19/04
CPCB01D19/0409
Inventor 黄潇贾骏赵宝钰王静王元胡丹段先建王成刚
Owner HUBEI HUIFU NANOMATERIAL CO LTD
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