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

A technology of silicone emulsion and defoamer, 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 stability Effect

Inactive Publication Date: 2007-12-19
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. Preparation of mixed emulsifier

[0024] Take the fatty acid as C 10 Acid is used as an initiator, potassium hydroxide accounting for 0.1% of the total weight is used as a catalyst, placed in a reaction kettle, heated and melted, vacuumed to 2700pa, and then cleaned twice with nitrogen, each time filled with nitrogen to 0.2Mpa, and then vacuumed, Then add oxirane in the proportioning ratio of fatty acid: oxirane=1: 20mol, be heated to 70 ℃ under agitation and make oxirane react, after the reaction finishes, lead nitrogen to 0.2Mpa stuffy still for 60 minutes, Blowing, then neutralize to pH=5 with oxalic acid, add 0.1% activated carbon accounting for the total weight of the reactant, press fi...

Embodiment 2

[0031] a. Synthesis of modified siloxane

[0032] 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;

[0033] b. Synthesis of mixed emulsifier

[0034] Take the fatty acid as C 18 Acid is used as an initiator, and potassium hydroxide accounting for 1.0% of the total weight is used as a catalyst, placed in a reactor, heated and melted, vacuumed to 2800pa, and then cleaned with nitrogen four times, each time filled with nitrogen to 0.5Mpa, and then vacuumed, Then add oxirane in the proportioning ratio of fatty acid: oxirane=1: 5mol, heat to 100 DEG C under agitation and make oxirane react, after the reaction finishes, lead nitrogen to 0.5Mpa stuffy still for 10 minutes, Blowing, then neutralize to pH=6 with oxalic acid, add 1.0% activated carbon accounting for the total weight of the reactants, press filter to get the fatty ...

Embodiment 3

[0040] a. Synthesis of modified siloxane

[0041] 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;

[0042] b. Synthesis of mixed emulsifier

[0043] Take the fatty acid as C 15 Acid is used as an initiator, potassium hydroxide accounting for 0.5% of the total weight is used as a catalyst, placed in a reaction kettle, heated and melted, vacuumed to 2700pa, and then cleaned with nitrogen for three times, each time filled with nitrogen to 0.2Mpa, then vacuumed, and then Add ethylene oxide according to the ratio of fatty acid: ethylene oxide = 1: 10mol, and heat to 90°C under stirring to make the ethylene oxide react. material, then neutralized to pH=5 with oxalic acid, added 0.5% activated carbon accounting for the total weight of the reactant, and press-filtered to obtain the fatty acid as C 15 acid, polyethylene...

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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 Patents(China)
IPC IPC(8): B01D19/04
Inventor 刘文阁邱新建孙惠章
Owner SHANDONG NORMAL UNIV
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