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Preparation method of novel polyether modified organic silicon defoamer

A technology of silicone defoamer and polyether-modified silicone oil, which is applied in separation methods, chemical instruments and methods, foam dispersion/prevention, etc. Good effect and other problems, to achieve the effect of excellent performance, good defoaming and anti-foaming performance, and short defoaming time

Inactive Publication Date: 2020-05-15
GUANGDONG IND TECHN COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Silicone has strong defoaming ability, less dosage but unsatisfactory antifoaming ability, while polyether defoaming agent has strong antifoaming ability but long defoaming time and low foam breaking rate
[0003] At present, the polyether modified silicone defoamer is mainly prepared by introducing polyether into the side chain of polysiloxane, and combining the advantages of polyether and silicone defoamer organically to prepare the defoamer, and this structure Polyether modified silicone defoamer, in some demanding process conditions, such as textile high-temperature dyeing process, fermentation process often does not achieve good results

Method used

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  • Preparation method of novel polyether modified organic silicon defoamer
  • Preparation method of novel polyether modified organic silicon defoamer
  • Preparation method of novel polyether modified organic silicon defoamer

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preparation example Construction

[0026] This embodiment provides a method for preparing a novel polyether modified silicone defoamer, comprising the following steps:

[0027] S1. Using tetramethyldihydrodisiloxane, octamethylcyclotetrasiloxane, and tetramethylcyclotetrasiloxane as raw materials, and using concentrated sulfuric acid as a catalyst to prepare double-end and side-chain hydrogen-containing silicone oils;

[0028] S2. Using 5 parts of the double-end and side-chain hydrogen-containing silicone oil and 1 part of allyl polyether as raw materials, grafting with 0.15 part of chloroplatinic acid as a catalyst to obtain a double-end and side-chain polyether modified silicone oil;

[0029] S3. Mix the double-end and side-chain polyether-modified silicone oil, silicone paste, and compound emulsifier, emulsify, add a thickener and stir to dilute after homogenization, and obtain a novel polyether-modified silicone defoamer. The compound emulsifier includes at least two kinds of Span-60, Span-80, and fatty alc...

Embodiment 1

[0034] Synthesis of double-end and side-chain polyether modified silicone oil:

[0035] In a 500mL four-neck flask equipped with a stirrer, a thermometer, and a reflux condenser, add metered 15 grams of tetramethyldihydrogendisiloxane, 300 g of octamethylcyclotetrasiloxane, 20 g of tetramethylcyclotetrasiloxane Siloxane and 3g concentrated sulfuric acid catalyst were stirred, heated to 45°C, and reacted for 5 h. After the obtained liquid is fully cooled, slowly add 9g of sodium carbonate powder to neutralize the sulfuric acid, adjust the pH to 6-7, and filter with a vacuum pump. Add 10 g of anhydrous magnesium sulfate to the obtained filtrate to dry, filter with suction, filter out the solid generated by neutralization, and obtain 322 g of a transparent product with a relative molecular mass of 3000 double-end and side chain hydrogen-containing silicone oil.

[0036]

[0037] In a 500 mL four-neck flask equipped with a stirrer, a thermometer, a nitrogen gas guide tube and ...

Embodiment 2

[0041] Preparation of silicone paste:

[0042] Add 50 g of 500mPa•s simethicone oil, 30g of 1500 mPa•s simethicone oil, 15 g of 1000mPa•s 107 glue, 10g of 5000mPa•s 107 glue, and 10 g of white carbon black in a 250mL three-necked flask , 12 g of methylvinyl MQ silicone resin, 4 g of potassium hydroxide, heating and stirring at 150 ° C for 3 h, and cooling down to room temperature to prepare a silicone paste.

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Abstract

The invention discloses a preparation method of a novel polyether modified organic silicon defoamer, wherein the method comprises the following steps: S1, preparing double-end and side-chain hydrogen-containing silicone oil by using tetramethyldihydrodisiloxane, octamethylcyclotetrasiloxane and tetramethylcyclotetrasiloxane as raw materials and concentrated sulfuric acid as a catalyst; S2, taking5 parts of the double-end and side-chain hydrogen-containing silicone oil and 1 part of allyl polyether as raw materials, and taking 0.15 part of chloroplatinic acid as a catalyst for grafting to obtain double-end and side-chain polyether modified silicone oil; and S3, mixing the double-end and side-chain polyether modified silicone oil, silicon paste and a compound emulsifier, emulsifying, homogenizing, then adding a thickener, stirring and diluting to obtain the novel polyether modified organic silicon defoamer which is high in foam breaking rate, strong in defoaming capacity, short in defoaming time, resistant to acid and alkali at high temperature, strong in stability and simple in process condition.

Description

technical field [0001] The invention relates to the field of defoamers, in particular to a preparation method of a novel polyether modified silicone defoamer. Background technique [0002] In the industrial production of printing and dyeing, paint, papermaking, fermentation, oil field and other industries, a large amount of foam is often generated due to operations such as stirring, vibration, boiling, etc. If it is not well controlled, the foam will bring a lot of trouble to production, such as affecting production. Normal operation, reducing the effective load of equipment, resulting in a decline in product quality and production capacity, etc. Therefore, it is necessary to eliminate foam, and adding a defoamer is a commonly used method. Alcohols, oils, ethers, soaps, organic polar compounds and polysiloxanes are commonly used as various types of defoamers, among which silicone and polyether defoamers are the main ones. It is also the main direction of current researcher...

Claims

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Application Information

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IPC IPC(8): B01D19/04
CPCB01D19/0409
Inventor 朱永闯徐梦漪龚盛昭周亮
Owner GUANGDONG IND TECHN COLLEGE
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