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Silicone defoaming composition and preparation method thereof

A technology of organosilicon and composition, applied in the field of organosilicon defoaming composition and preparation, can solve the problems of large difference in product viscosity, difficult control, poor emulsion state, etc.

Inactive Publication Date: 2011-04-06
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

A large number of experiments have shown that the reaction between polysiloxane and silicone resin is difficult to control. The specific performance is that the viscosity of the product varies greatly between batches, and there will be some insoluble silicone when forming the final defoaming composition. Resin particles, which cause the above-mentioned insoluble particles to remain in the defoamer emulsion obtained after emulsification, thus making the emulsion state poor

Method used

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  • Silicone defoaming composition and preparation method thereof
  • Silicone defoaming composition and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032]Mix 280g (by 120g of dimethylphenylsiloxy end-capped polydimethylsiloxane with a viscosity of 500mPa·s and 160g of MQ resin, the molar ratio of M chain unit and Q chain unit is 0.65:1.0, at 80°C The formed) MQ resin solution was added to a 5L mixer, and 1,680g of trimethylsiloxy-terminated polydimethylsiloxane with a viscosity of 5,000mPa·s and 72g of potassium methylsiliconate were added and mixed at 80°C Polymerization takes place for 3h, then add 150g specific surface area is 280m 2 / g of gas-phase method hydrophobic silica, mixed and reacted at 100°C for 4h, then continued to heat up to 180°C, and maintained at this temperature for 2h, then maintained at -0.03MPa vacuum for 0.5h to remove small molecules, Finally, it was cooled to room temperature to obtain a white viscous silicone antifoaming composition.

Embodiment 2

[0034] 360g (by 160g of polydimethylsiloxane with a viscosity of 100mPa·s methyldiphenylsiloxy-terminated polydimethylsiloxane and 200g of MQ resin, the molar ratio of M chain unit and Q chain unit is 0.8: 1.0, at 60 ℃ The formed) MQ resin solution was added to a 5L mixer, and 1,640g of trimethylsiloxy-terminated polydimethylsiloxane with a viscosity of 100,000mPa·s and 9g of KOH were added, and the polymerization reaction occurred at 100°C for 1h. Then add 100g specific surface area is 200m 2 / g of gas-phase method hydrophobic silica, fully stirred evenly, and reacted at a temperature of 110°C for 4h, then continued to heat up to 160°C, and maintained at this temperature for 2h, then maintained at a vacuum of -0.06MPa for 2h, Finally, cool to room temperature to obtain a white viscous silicone antifoaming composition.

Embodiment 3

[0036] 600g (by 400g of dimethylvinylsiloxy end-capped polydimethylsiloxane with a viscosity of 50,000mPa·s and 200g of MQ resin, the molar ratio of M chain segment and Q chain segment is 0.5:1.0, at 90 ℃ formed) MQ resin solution was added to a 5L mixer, and 1,400g of trimethylsiloxy-terminated polydimethylsiloxane with a viscosity of 20,000mPa·s and 36g of tetramethylammonium hydroxide were added, and at 120 ℃ polymerization reaction 1.5h, then add 150g specific surface area of ​​150m 2 / g precipitation method hydrophobic silica, and mix and react at 100°C for 5h, then continue to heat up to 200°C, and maintain at this temperature for 3h, then maintain at -0.05MPa vacuum for 1h to remove small molecules, and finally Cool to room temperature to obtain a white viscous silicone antifoaming composition.

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Abstract

The invention relates to a silicone defoaming composition comprising polysiloxane A, polysiloxane B, fine filling grains, organic siliconresin and a basic catalyst. The preparation method comprises the following steps of: adding the polysiloxane B and the organic siliconresin into a reaction vessel and heating to 40-150 DEG C to form a solution; then, adding the polysiloxane A and the basic catalyst into the organic siliconresin solution, mixing and heating to 60-120 DEG C and reacting for 0.5-5 hours; adding the fine filling grains into the mixture and evenly mixing, reacting for 1-7 hours at the temperature of 60-140 DEG C, then, heating to 120-230 DEG C and further reacting for 1-4 hours; after finishing the reaction, keeping the mixture for 0.5-3 hours at a vacuum degree of -0.01-0.1MPa; and finally, cooling to room temperature. The silicone defoaming composition has excellent defoaming performance in an anionic system and a nonionic system.

Description

technical field [0001] The invention relates to a silicone defoaming composition and a preparation method. More precisely, it relates to a method for synthesizing a silicone defoaming composition by cross-linking reaction between polyorganosiloxane and silicone resin solution, which solves the problem of insufficient reaction of silicone resin, and the obtained composition is in anionic , It has excellent defoaming and antifoaming performance in non-ionic foaming system. The invention belongs to the technical field of fine chemical preparations. technical background [0002] Bubbles are a common phenomenon in life and work. But in the vast majority of industrial production, foam will bring great harm, such as reducing the working efficiency of machines, delaying labor time, affecting the quality of products, etc. The method of eliminating harmful foam is generally to add defoamer. With the substantial increase in the production scale and production efficiency of industri...

Claims

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Application Information

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IPC IPC(8): B01D19/04
Inventor 吴飞曹添黄伟何庆海
Owner JIANGSU SIXIN SCI-TECH APPL RES INST CO LTD