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Antifoaming agent composition and preparation method thereof

A technology of composition and defoamer, which is applied in the direction of foam dispersion/prevention, and can solve the problems of high viscosity, difficult control and high viscosity of defoaming active substances

Active Publication Date: 2012-06-13
滁州四新科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

US5153258 introduces the introduction of lightly cross-linked polyorganosiloxane into the system to improve the antifoaming performance of the composition, such as vinyl-containing polyorganosiloxane and hydrogen-containing polyorganosiloxane, hydroxyl-containing polyorganosiloxane Alkanes and alkyl silicates undergo crosslinking reactions under the action of catalysts, but the degree of crosslinking is difficult to control
WO2007137948A1 describes the reaction between hydrogen-containing polyorganosiloxane and vinyl polyorganosiloxane, adding trimethylsiloxy-terminated polydimethylsiloxane for dilution, and the hydrogen-containing polyorganosiloxane in the above-mentioned patent When reacting with vinyl polyorganosiloxane, the viscosity is large and difficult to control, and the defoamer composition obtained has poor defoaming and antifoaming performance
CN1931417A discloses a high-temperature-resistant and strong-alkali-resistant defoamer composition, which is obtained by the crosslinking reaction of polysiloxane and organosilicon resin. After the active substance is prepared into an emulsion, the performance is tested by bubbling in black liquor. It has good antifoaming performance, but the defoaming speed needs to be further improved, and because the antifoaming active substance has a high viscosity, it is quite difficult to disperse it in water

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] In a 1000mL beaker, put 200g of trimethylsiloxy-terminated polydimethylsiloxane with a viscosity of 100mPa·s, 100g of side-chain hydrogen-containing polyorganosiloxane Me with a viscosity of 20mPa·s 3 SiO(MeHSiO) 2 (Me 2 SiO) 20 SiMe 3 , 60 g of bisvinyl-terminated polyorganosiloxane ViMe with a viscosity of 150 mPa s 2 SiO(Me 2 SiO) 135 SiMe 2 Vi and 36g polyether modified polysiloxane (x=100, y=20, z=3, h=20, i=40, R 3 =-H). Heating to raise the temperature, add 0.096g isopropanol solution of chloroplatinic acid at 60°C, keep warm for 0.5h; then add 18g specific surface area of ​​200m 2 / g of fumed hydrophobic silica and 18g of MQ resin (M:Q=0.75:1), the system was heated up to 120°C and maintained at this temperature for 4h, then maintained at -0.03MPa vacuum for 0.5h, cooled At room temperature, an antifoaming agent composition having a viscosity of 7,000 mPa·s was obtained.

Embodiment 2

[0041] In a 1000mL beaker, put 200g of phenyldimethylsiloxy-terminated polydimethylsiloxane with a viscosity of 1,000mPa·s, and 100g of side-chain hydrogen-containing polydimethylsiloxane Me with a viscosity of 100mPa·s 3 SiO(MeHSiO) 3 (Me 2 SiO) 69 SiMe 3 , 78 g of bisvinyl-terminated polyorganosiloxane ViMe with a viscosity of 600 mPa s 2 SiO(Me 2 SiO) 380 SiMe 2 Vi and 15g polyether modified polysiloxane (x=50, y=8, z=3, h=14, i=8, R 3 =-CH 3 ). Heating to raise the temperature, add 0.1g chloroplatinic acid isopropanol solution at 100°C, keep warm for 0.25h; then add 15g specific surface area of ​​150m 2 / g of fumed hydrophobic silica and 38g of MQ resin (M:Q=0.65:1), the system was heated up to 140°C and maintained at this temperature for 3h, then maintained at -0.03MPa vacuum for 0.5h, Cool to room temperature to obtain a defoamer composition with a viscosity of 10,000 mPa·s.

Embodiment 3

[0043] In a 1000mL beaker, put 200g of aminodimethylsiloxy-terminated polydimethylsiloxane with a viscosity of 1,000mPa·s, and 100g of side-chain hydrogen-containing polydimethylsiloxane Me with a viscosity of 1500mPa·s 3 SiO(MeHSiO) 36 (Me 2 SiO) 500 SiMe 3 , 38 g of bisvinyl-terminated polyorganosiloxane ViMe with a viscosity of 1000 mPa s 2 SiO(Me 2 SiO) 450 SiMe 2 Vi and 15g polyether modified polysiloxane (x=150, y=10, z=3, h=20, i=7, R 3 =-CH 3 ). Heat up, add 0.1g isopropanol solution of chloroplatinic acid at 50°C, keep warm for 2h; then add 15g with a specific surface area of ​​90m 2 / g of precipitated hydrophobic silica and 17g of MQ resin (M:Q=065:1), the system was heated to 90°C and maintained at this temperature for 3h, then maintained at -0.06MPa vacuum for 1h, cooled At room temperature, an antifoaming agent composition having a viscosity of 12,600 mPa·s was obtained.

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Abstract

The invention provides an antifoaming agent composition and a preparation method thereof. The antifoaming active matter is prepared by carrying out a reaction of hydrogen-containing polysiloxane and vinyl polysiloxane, introducing polyether modified polyorganosiloxane, mixing the mixture with silicon dioxide and silicone resin; and the obtained antifoaming active matter has excellent defoaming speed and antifoaming performance in an anion and a nonionic foaming system. The addition of the silicon polyether effectively controls the degree of crosslinking and enhances affinity of the antifoaming active matter with water. The prepared antifoaming active matter can be applied to weaving printing and dyeing, pulping papermaking and sewerage treatment, etc.

Description

technical field [0001] The invention relates to the preparation of a defoamer composition based on the reaction of hydrogen-containing polyorganosiloxane and vinyl polyorganosiloxane, and introducing polyether modified polysiloxane into it. It has excellent defoaming performance in non-ionic foaming system. The defoamer composition belongs to fine chemicals, therefore, the present invention belongs to the technical field of fine chemical preparations. Background technique [0002] Bubbles are a common phenomenon in life and work. However, in industrial production, sometimes foam can cause great harm, such as reducing the working efficiency of machines, delaying working hours, and affecting product quality. There are mainly physical methods and chemical methods to eliminate harmful foam, and defoamer defoaming is one of the chemical methods. With the substantial increase in the production scale and production efficiency of industrial enterprises, defoamers and defoamers ha...

Claims

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Application Information

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IPC IPC(8): B01D19/04
Inventor 黄伟曹添吴飞任意杨有忠
Owner 滁州四新科技有限责任公司
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