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High-temp. resistance organosilicon emulsion defoaming agents, and its synthetic method

A technology of silicone emulsion and synthesis method, applied in the direction of foam dispersion/prevention, etc., can solve the problems of inability to use, reduce foam suppression and defoaming performance, etc., achieve good stability, improve temperature resistance, and good foam suppression effect.

Inactive Publication Date: 2005-11-09
SHANDONG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the defoamer has significant defoaming ability at normal temperature, it breaks the emulsion when heated, and separates oil and water, which reduces its antifoaming and defoaming performance, and even cannot be used, especially not suitable for pharmaceutical, food and brewing needs. Used in high temperature sterilization industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] a. Synthesis of modified siloxane

[0022] Conventional methods use octamethylcyclotetrasiloxane, potassium hydroxide, absolute ethanol, hydrochloric acid, propylene oxide and ethylene oxide as raw materials to synthesize modified siloxane with a viscosity of 0.5 Pa·s;

[0023] b. Synthesis of mixed emulsifier

[0024] C 10 Acids, fatty alcohols are C 8 Alcohol and the catalyst potassium hydroxide that accounts for 0.1% of total weight are put in the reaction kettle, heated and melted, vacuumized to 2700pa, sweep the kettle twice with nitrogen, fill nitrogen to 0.2Mpa each time, then vacuumize; Add ethylene oxide at a ratio of 1:20 mol, stir and heat to 70°C. After the ethylene oxide reaction is completed, pass nitrogen to a 0.2Mpa stuffy kettle for 60 minutes, discharge the material, and then neutralize with oxalic acid until PH = 5. Add 0.1% activated carbon to the total weight of the reactants, press filter to obtain emulsifiers; 10 acid, polyethylene glycol-(-O-...

Embodiment 2

[0028] a. Synthesis of modified siloxane

[0029] Conventional methods use octamethylcyclotetrasiloxane, potassium hydroxide, absolute ethanol, hydrochloric acid, and oxyalkylene as raw materials to synthesize modified siloxane with a viscosity of 2 pa s;

[0030] b. Synthesis of mixed emulsifier

[0031] C 18 Acids, fatty alcohols are C 12 Alcohol and the catalyst sodium hydroxide that accounts for 1.0% of total weight are put in the reaction kettle, heating and melting, after vacuumizing to 2800pa, sweep the kettle with nitrogen four times, fill nitrogen to 0.5Mpa each time, then vacuumize; Add ethylene oxide at a ratio of ethane=1:5mol, stir and heat to 100°C, after the reaction of ethylene oxide is completed, pass nitrogen to 0.5Mpa and stuff the kettle for 10 minutes, discharge the material, and then neutralize it to pH with oxalic acid =6, add 1.0% activated clay that accounts for the total weight of the reactant, and press filter to obtain the emulsifier; 18 acid, p...

Embodiment 3

[0035] a. Synthesis of modified siloxane

[0036] The conventional method uses octamethylcyclotetrasiloxane, potassium hydroxide, absolute ethanol, hydrochloric acid, and oxyalkylene as raw materials to synthesize a modified siloxane with a viscosity of 1.0 Pa·s;

[0037] b. Synthesis of mixed emulsifier

[0038] C 15 Acids, fatty alcohols are C 12 Alcohol and the catalyst potassium hydroxide that accounts for 0.5% of total weight are put in the reaction kettle, heated and melted, vacuumized to 2700pa, sweep the still with nitrogen three times, fill nitrogen to 0.2Mpa each time, then vacuumize; Add ethylene oxide at a ratio of ethane=1:10mol, stir and heat to 90°C, after the reaction of ethylene oxide is completed, pass nitrogen gas to a 0.2Mpa stuffy kettle for 30 minutes, discharge the material, and then neutralize it to pH with oxalic acid =5, add 0.5% gac and account for the total weight of the reactant, and press filter to obtain the emulsifier;15 acid, polyethylene gl...

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PUM

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Abstract

A refractory organic silicon emulsion as defoamer is prepared from the modified siloxane with 0.5-2 pa.s viscosity and the mixed emulsifier containing at least one organic acid, alcohol, or amine through proportional mixing, adding water and emulsifying.

Description

technical field [0001] The invention relates to a surfactant and its organic synthesis, more specifically to a high-temperature-resistant organic silicon emulsion defoamer and its synthesis method. Background technique [0002] At present, the defoamers produced at home and abroad mainly include polyethers and silicones. Since polyethers have residual oxyalkylene monomers and residual aldehydes produced during the production process, they have certain toxic and side effects on bacteria, and are gradually being replaced by silicones. Silicone defoamer mainly chooses dimethyl silicone oil, because of its unique structure, dimethyl silicone oil has a low surface tension, so it can be used as a good defoamer. Although the defoamer has significant defoaming ability at normal temperature, it breaks the emulsion when heated, and separates oil and water, which reduces its antifoaming and defoaming performance, and even cannot be used, especially not suitable for pharmaceutical, foo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D19/04
Inventor 刘文阁邱新建孙惠章
Owner SHANDONG NORMAL UNIV
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