Organic silicon antifoaming agent with polymers and preparation method thereof

A technology of silicone defoamer and polydimethylsiloxane, which is applied in the field of silicone additives, can solve the problems of large differences in the solubility parameters of silicone additives, and achieve good defoaming and anti-foaming effects, dilution Better stability and emulsion stabilization effect

Active Publication Date: 2017-12-15
优美特(北京)环境材料科技股份公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Dimethylpolysiloxane-ladder fluorocarbon-based silsesquioxane copolymer has a large difference in the solubility parameters of silicone additives in aqueous emulsions. So far, the defoamers with it as the main effective component are still very limited. less attention

Method used

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  • Organic silicon antifoaming agent with polymers and preparation method thereof
  • Organic silicon antifoaming agent with polymers and preparation method thereof
  • Organic silicon antifoaming agent with polymers and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Dissolve 100g of 100g / mol hydroxy silicone oil in 50g of toluene, and 585g of dodecafluoroheptylpropyltrimethoxysilane in 200g of ethanol, and then add them in turn to a 2000mL three-necked flask equipped with a stirring blade, a reflux condenser and a thermometer , after stirring until pure and transparent, adjust pH=12 with saturated NaOH solution, and react at 80°C for 6h. Then distilled under reduced pressure at 150°C to obtain polydimethylsiloxane-ladder fluorocarbon silsesquioxane copolymer;

[0035] Knead 200g of simethicone oil, 200g of polydimethylsiloxane-trapezoidal fluorocarbon silsesquioxane copolymer, and 40g of hydrophobic silica in a double planetary mixer, and then stir for 30min with a disperser at 1000r / min. Add 50g of emulsifier, stir at 1000r / min for 30min, add dropwise 400g of deionized water for 30min, add dropwise 1% thickener aqueous solution made of 1g of thickener and 100g of deionized water, stir at 1000r / min for 30min, and obtain the A sili...

Embodiment 2

[0037] Dissolve 150g of 300g / mol hydroxy silicone oil in 100g of toluene, 320g of dodecafluoroheptylpropyltrimethoxysilane in 100g of ethanol, and then add them in turn to a 2000mL three-necked flask equipped with a stirring paddle, a reflux condenser and a thermometer. After stirring until pure and transparent, adjust pH=13 with KOH saturated solution, and react at 70°C for 7h. Then distilled under reduced pressure at 140°C to obtain polydimethylsiloxane-ladder fluorocarbon silsesquioxane polymer;

[0038] Knead 300g of simethicone oil, 100g of polydimethylsiloxane-trapezoidal fluorocarbon silsesquioxane copolymer, and 50g of hydrophobic white carbon black in a double planetary mixer, and then stir with a disperser at 1000r / min for 30min. Add 60g of emulsifier, stir at 1500r / min for 30min, add dropwise 400g of deionized water for 30min, then dropwise add 1% thickener aqueous solution made of 1.5g of thickener and 150g of deionized water, and stir at 1500r / min for 30min to obt...

Embodiment 3

[0040] Dissolve 200g of 600g / mol hydroxyl silicone oil in 100g of toluene, and 231g of dodecafluoroheptylpropyltrimethoxysilane in 100g of ethanol, and then add them in turn to a 2000mL three-necked flask equipped with a stirring blade, a reflux condenser and a thermometer. After stirring until pure and transparent, adjust pH=14 with NaOH saturated solution, and react at 60°C for 6.5h. Then distilled under reduced pressure at 130°C to obtain polydimethylsiloxane-ladder fluorocarbon silsesquioxane polymer;

[0041] Knead 100g of simethicone oil, 300g of polydimethylsiloxane-trapezoidal fluorocarbon silsesquioxane copolymer, and 60g of hydrophobic silica in a double planetary mixer, and then stir for 30min with a disperser at 1500r / min. Add 80g of emulsifier, stir at 2000r / min for 30min, add dropwise 400g of deionized water for 30min, add dropwise 1% thickener aqueous solution made of 2g of thickener and 200g of deionized water, stir at 2000r / min for 30min, and obtain the A sil...

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Abstract

The invention discloses an organic silicon antifoaming agent with polydimethylsiloxane-trapezoid fluoro-hydrocarbons radical silsesquioxane copolymer and a preparation method thereof. The organic silicon antifoaming agent is prepared from, by weight, 10-30% of polydimethylsiloxane-trapezoid fluoro-hydrocarbons radical silsesquioxane copolymer, 10-30% of simethicone, 4-8% of hydrophobic white carbon black, 5-10% of emulgator, 0.1-0.3% of thickener and 50-70% of deionized water. The organic silicon antifoaming agent is quick in defoaming, lasting in foam inhibition and stable in emulsion, shrinkage cannot be caused on base materials such as PVC thin film, and the agent is wide in application range. The organic silicon antifoaming agent is simple in preparation technology and low in product cost, and the product has excellent defoaming effect on emulsion polymerization reaction in particular to polyurethane emulsion polymerization reaction.

Description

technical field [0001] The invention belongs to the technical field of organosilicon additives, in particular to an organosilicon defoamer containing polydimethylsiloxane-ladder fluorocarbon silsesquioxane copolymer and a preparation method thereof. Background technique [0002] Methyl silicone oil is used as a defoamer. It has the characteristics of low surface tension, low water solubility, high activity, low volatility, chemical inertness, and no physiological toxicity. It has fast defoaming speed, long foam suppression time, wide application, but high temperature resistance Poor resistance, weak resistance to strong alkali; and ether defoamers, although large expansion coefficient, good water solubility, high temperature resistance, strong alkali resistance, but the defoaming speed and foam suppression time are not ideal. In recent years, ether-modified siloxane has become a research and development hotspot at home and abroad. Through ether grafting or block modificatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D19/04C08G77/44
Inventor 张建森王文忠张俊环张小宸
Owner 优美特(北京)环境材料科技股份公司
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