Cyclodextrin-modified polyether-grafted polysiloxane defoamer and preparation method thereof

A polysiloxane defoamer, polysiloxane technology, applied in separation methods, chemical instruments and methods, foam dispersion/prevention, etc., can solve problems such as limited application, unsatisfactory shear resistance, etc., to achieve Improved shear resistance, excellent shear resistance, and good chemical stability

Inactive Publication Date: 2017-02-22
合肥新万成环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polyether modified silicone oil defoamer currently studied is not ideal in terms of shear resistance, which limits its application in some fields such as coatings, petrochemicals, and papermaking.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0023] A cyclodextrin-modified polyether-grafted polysiloxane defoamer, consisting of the following raw materials in parts by weight (kg): polysiloxane 36, hyperbranched polyether 20, allyl glycidyl ether 23, Propylene oxide 50, double metal cyanide complex 0.4, isopropanol 63, chloroplatinic acid catalyst 0.5, ultrafine aluminum silicate 5, sorbitol 1, Tween 60 2, sodium carboxymethylcellulose 3, Appropriate amount of deionized water, α-cyclodextrin 8.

[0024] Specific steps are as follows:

[0025] (1) Preparation of allyl-terminated hyperbranched polyether:

[0026] Add hyperbranched polyether and double metal cyanide complex into a high-pressure reactor, vacuumize and dehydrate, and replace with nitrogen for 3 times, after heating up to 120°C, feed 2 / 3 parts of propylene oxide to control the temperature of the reaction process At about 135°C, when the pressure in the kettle drops, add allyl glycidyl ether and the remaining propylene oxide to continue polymerization for ...

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PUM

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Abstract

The invention discloses a cyclodextrin-modified polyether-grafted polysiloxane defoamer and a preparation method thereof. The cyclodextrin-modified polyether-grafted polysiloxane defoamer comprises the following raw materials in parts by weight: 25-40 parts of polysiloxane, 14-21 parts of hyperbranched polyether, 16-25 parts of allyl glycidyl ether, 42-58 parts of propylene oxide, 0.3-0.6 part of a bimetallic cyanide complex, 50-70 parts of isopropanol, 0.2-0.7 part of a chloroplatinic acid catalyst, 3-7 parts of superfine aluminum silicate, 1-2 parts of sorbitol, 0.8-2 parts of tween 60, 2-4 parts of sodium carboxymethyl cellulose, a proper amount of deionized water and 6-10 parts of alpha-cyclodextrin. The hyperbranched polyether containing a large number of hydroxyl groups at terminals is used as a raw material for preparing terminated allyl hyperbranched polyether, and a hydrosilylation reaction is performed on double-bond structures of terminal groups of the modified hyperbranched polyether and the polysiloxane to synthesize hyperbranched polyether-modified polysiloxane; the prepared defoamer has excellent shear resistance.

Description

technical field [0001] The invention relates to the field of chemicals, in particular to a cyclodextrin-modified polyether-grafted polysiloxane defoamer and a preparation method thereof. [0002] technical background [0003] Defoamers, also known as defoamers or defoamers, will produce many foams that affect production during industrial production, and defoamers need to be added. It is widely used to remove harmful foam produced in the production process of latex, textile sizing, food fermentation, biomedicine, paint, petrochemical, papermaking, industrial cleaning, sewage treatment and other industries. [0004] The current defoamers can be divided into two categories: silicone type and polyether type according to the composition. Due to the addition of emulsifiers and other additives, silicone defoamers are prone to defects such as demulsification and oil floating at higher temperatures; Polyether-type defoamers are mostly polymers formed by ring-opening polymerization of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D19/04C08G81/00
CPCB01D19/0404B01D19/0409B01D19/0413C08G81/00
Inventor 杨成勇杨云胡亚琼任意何庆海
Owner 合肥新万成环保科技有限公司
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