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Defoaming composition

A composition and defoaming technology, applied in the direction of foam dispersion/prevention, etc., can solve the problems of excessive fluctuation of ammonia content of amino silicone oil, easy fluctuation of viscosity of silicone grease, lack of defoaming ability, etc., and achieve excellent defoaming and anti-foaming performance. , good leveling performance, excellent defoaming and anti-foaming performance

Active Publication Date: 2015-07-22
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

EP163541 introduced a kind of polyorganosiloxane containing terminal hydroxyl reacted with polyorganosiloxane containing other active functional groups to form branched polyorganosiloxane under the action of catalyst, and mixed with hydrophilic silica Defoamer produced, but its viscosity was too high to emulsify
CN1931417 discloses the defoaming composition prepared by polysiloxane and organosilicon resin crosslinking reaction and emulsification, although it has better antifoaming performance, defoaming ability is lacking, and viscosity is bigger, makes it disperse in water It is also quite difficult; US5153258 introduces a method of introducing slightly crosslinked polyorganosiloxanes to improve the antifoaming properties of the composition, such as vinyl polyorganosiloxanes, hydrogen-containing polyorganosiloxanes and Hydroxyl-containing polyorganosiloxane and alkyl silicate undergo a cross-linking reaction under the action of a catalyst, but it is difficult to control the degree of cross-linking during the preparation process
WO2011107361 discloses a modified amino polysiloxane defoaming fluid (XR 2 S i (OS i AR) n (OSiR 2 ) m OS i R 2 X) The defoamer prepared with the carrier filler has simple process synthesis, but the viscosity of silicone grease fluctuates easily and is not easy to control; CN200510059062.0 introduces a preparation method of amino functional organopolysiloxane, which is used in basic catalyst (alkali metal Hydroxide, alkali metal alkoxide and alkali metal siloxane alkoxide), the aminosilane (R a Q b Si(OR 1 ) 4-(a+b) ) and organosilicon compounds (R c Si(OR 1 ) 4-c ) and alcohol (H-[O(CHR 2 ) p ] m OR 3 ) are mixed to obtain silicone grease active material. In this process, the self-crosslinking reaction of amino silicone oil is used, but the ammonia value of amino silicone oil fluctuates too much during the reaction process; WO2007137948 introduces a hydrogen-containing polyorganosiloxane After reacting with vinyl polyorganosiloxane, the preparation method of adding trimethylsiloxy-terminated polydimethylsiloxane diluted defoaming composition, wherein hydrogen-containing polyorganosiloxane and vinyl polyorganosiloxane When siloxane reacts, the viscosity is large and difficult to control, and the defoamer composition obtained thereupon has poor defoaming and antifoaming performance

Method used

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  • Defoaming composition

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Add 350g of hydroxyl-terminated polyorganosiloxane with a viscosity of 9000mPa·s, 50g of MQ silicone resin (M:Q = 0.8:1) and 400g of polydimethylsiloxane with a viscosity of 500mPa·s into the container, at 0.025g Under the action of potassium organosiloxane catalyst, react at 54°C for 0.75h, then add 29.9g of polydimethylsiloxane with a viscosity of 13mPa·s, heat up to 105°C for 2.5h, and then vacuumize and homogenize After qualitative treatment; add 150g aminopolyorganosiloxane (CH 3 ) 3 SiO[(NH 2 )(CH 2 CH 2 NH 2 )SiO] 10 [(CH 3 ) 2 SiO] 150 Si (CH 3 ) 3 , under the action of 0.075g sodium hydroxide catalyst and react at 160°C for 1h, finally add 20g specific surface area of ​​90m 2 / g of precipitation-method hydrophobic silica, lower the temperature to 130°C and keep it warm for 1 hour, and after cooling down to room temperature, a translucent defoaming composition S1 is obtained.

Embodiment 2

[0043] Add 200g of hydroxyl-terminated polyorganosiloxane with a viscosity of 10000mPa·s, 100g of MQ silicone resin (M:Q=1.2:1) and 250g of polydimethylsiloxane with a viscosity of 1000mPa·s into the container. Under the action of a potassium organosiloxane catalyst, react at 60°C for 0.5h, then add 50g of polydimethylsiloxane with a viscosity of 5 mPa·s, heat up to 100°C for 3h, then vacuumize and homogenize After chemical treatment; add 338g aminopolyorganosiloxane (CH 3 ) 3 SiO[(CH 3 )(CH 2 NH 2 )SiO] 20 [(CH 3 ) 2 SiO] 350 Si (CH 3 ) 3 , after reacting for 0.5h at 140°C under the action of 0.75g potassium organosiloxane catalyst, finally add 60g 2 / g of precipitation-method hydrophobic silica, lower the temperature to 110°C and keep it warm for 3 hours, and after cooling down to room temperature, a translucent defoaming composition S2 is obtained.

Embodiment 3

[0045] Add 200g of hydroxyl-terminated polyorganosiloxane with a viscosity of 15000mPa·s, 75g of MQ silicone resin (M:Q = 1:1) and 379g of polydimethylsiloxane with a viscosity of 200mPa·s into the container. Under the action of potassium siloxanate catalyst, react at 50°C for 1h, then add 5g of polydimethylsiloxane with a viscosity of 20 mPa·s, raise the temperature to 110°C for 2.8h, then vacuumize and homogenize After treatment; add 300g aminopolyorganosiloxane (CH 3 ) 3 SiO[(CH 3 ) (NHCH 2 OCH 2 NH 2 )SiO] 30 [(CH 3 ) 2 SiO] 600 Si(CH 3 ) 3 , after reacting for 1.25h under the action of 0.7g triethanolamine catalyst and 120℃, finally add 40g specific surface area of ​​100m 2 / g of precipitation-method hydrophobic silica, lower the temperature to 80°C and keep it for 5 hours, and after cooling down to room temperature, a translucent defoaming composition S3 is obtained.

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Abstract

The invention relates to a defoaming composition. By introducing amino polysiloxane into a system comprising polydimethylsiloxane used as a solvent, hydroxyl polysiloxane, MQ silicon resin and silicon dioxide, a series of problems that the cross-linking degree is hard to control and the emulsion degree can be affected by the viscosity can be effectively solved.

Description

technical field [0001] The invention relates to a defoaming composition, which can be used as the defoaming component of silicone emulsion and solid defoaming agent. Therefore, the present invention belongs to the technical field of fine chemical preparations. Background technique [0002] Foam is a ubiquitous phenomenon in life and work, but sometimes foam can cause great harm in industrial production, such as reducing the production efficiency of machines and affecting the quality of products. The methods of eliminating harmful foam mainly include physical methods and chemical methods, among which defoaming agent defoaming is one of the chemical methods. And with the expansion of production scale and the improvement of production efficiency, defoamers have been widely used by virtue of their unique advantages. At present, defoamers are widely used in papermaking, textile printing and dyeing, coatings, emulsion polymerization, sewage treatment, and metal cleaning industri...

Claims

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Application Information

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IPC IPC(8): B01D19/04
Inventor 杨有忠范元斌黄伟吴飞曹添
Owner JIANGSU SIXIN SCI-TECH APPL RES INST CO LTD