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A kind of water-soluble polyether modified silicone defoamer and its preparation and compounding method

A silicone defoamer and water-soluble polyether technology, applied in the field of coatings and water-based inks, can solve the problems of poor alkali resistance, insoluble in water, unsatisfactory defoaming speed and foam suppression time, etc. Compatibility, improve product quality, improve the effect of the environment

Inactive Publication Date: 2011-12-21
黄山市强力化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The primary purpose of the present invention is to provide a water-soluble polyether modified silicone defoamer, which not only effectively solves the problems of polysiloxanes being difficult to dissolve in water, high temperature resistance and strong alkali resistance, but also Solved the problem that the defoaming speed and foam suppression time of polyether defoamers are not ideal

Method used

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  • A kind of water-soluble polyether modified silicone defoamer and its preparation and compounding method
  • A kind of water-soluble polyether modified silicone defoamer and its preparation and compounding method
  • A kind of water-soluble polyether modified silicone defoamer and its preparation and compounding method

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preparation example Construction

[0034] A preparation method of water-soluble polyether modified silicone defoamer, comprising the following steps:

[0035] a. Add allyl-terminated polyoxyalkylene ether into the container for stirring, and vacuum distill to remove water until the water content reaches 0.5-1‰. Adding a solvent when removing water will have a better effect of removing water, but the subsequent treatment will be more troublesome. The reason why allyl-terminated polyoxyalkylene ethers need to be strictly dewatered: Even a small amount of water can hydrolyze the Si-H group in the low-hydrogen silicone oil and further shrink and cross-link, which greatly increases the molecular weight of the product and has a more structured structure. Complex, which makes it easier to form gel insoluble matter.

[0036] b. Then add solvent and low-hydrogen-containing silicone oil to the system in step a and stir, control the amount and adding speed of low-hydrogen-containing silicone oil, slowly add the reaction ...

Embodiment 1

[0060] Embodiment 1, the preparation of polyether modified silicone defoamer

[0061] a. Add allyl-terminated polyoxyalkylene ether and toluene accounting for 20% of the total mass of allyl-terminated polyoxyalkylene ether and low hydrogen-containing silicone oil into the container for stirring, and vacuum distill to remove water until the water content reaches 0.5‰.

[0062] b. Then add low-hydrogen-containing silicone oil to the system in step a and stir, control the amount and adding speed of low-hydrogen-containing silicone oil, slowly add to the reaction system drop by drop, and stir at a uniform speed. The ratio of the amount of the C=C group substance of the terminal allyl polyoxyalkylene ether to the amount of the low hydrogen-containing silicone oil Si-H group substance is 1.1:1.

[0063] C, then add the isopropanol solution of chloroplatinic acid as catalyzer, install reflux condenser, in N 2 Under the atmosphere, stir and heat to 90°C for 4 hours, and keep warm unt...

Embodiment 2

[0071] Embodiment 2, the preparation of polyether modified silicone defoamer

[0072] a. Add allyl-terminated polyoxyalkylene ether and xylene accounting for 35% of the total mass of allyl-terminated polyoxyalkylene ether and low-hydrogen-containing silicone oil into the container for stirring, and vacuum distill to remove water until the water content reaches 1‰ .

[0073] b. Then add low-hydrogen-containing silicone oil to the system in step a and stir, control the amount and adding speed of low-hydrogen-containing silicone oil, slowly add to the reaction system drop by drop, and stir at a uniform speed. The ratio of the amount of the C=C group substance of the terminal allyl polyoxyalkylene ether to the amount of the low hydrogen-containing silicone oil Si-H group substance is 1.4:1.

[0074] C, then add the isopropanol solution of chloroplatinic acid as catalyzer, install reflux condenser, in N 2 Under the atmosphere, stir and heat to 120° C. for 6 hours, and keep warm u...

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Abstract

The invention relates to a water-soluble polyether modified silicone defoamer. The preparation method of the polyether-modified silicone defoamer comprises the following steps: firstly, adding terminal allyl polyoxyalkylene ether into a container for stirring, removing water; then adding solvent and low hydrogen-containing silicone oil into the above solution and stirring; then The catalyst is added to carry out stirring and heating reaction under N2 atmosphere and reflux condensation conditions; after the reaction is completed, the solvent and low boilers are removed to obtain the water-soluble polyether modified silicone. The invention also provides a compounding method of the water-soluble polyether modified silicone defoamer prepared by the above preparation method. The defoaming agent solves the problems that polysiloxanes are difficult to dissolve in water, have poor high temperature resistance and strong alkali resistance, and polyether defoaming agents have unsatisfactory defoaming speed and foam suppression time. The compounding method of water-soluble polyether-modified silicone defoamer solves the problems of incomplete emulsification of simethicone-type defoamer, demulsification when used, low temperature resistance and poor foam suppression ability.

Description

technical field [0001] The invention relates to a water-soluble polyether modified silicone defoamer and a preparation and compounding method thereof, which are mainly used in water-based ink and paint industries. Background technique [0002] Polysiloxane defoamers have the characteristics of rapid defoaming, long antifoaming time, safety and non-toxicity. But it is insoluble in water, poor in high temperature resistance and strong alkali resistance. Polyether defoamers have good water solubility, high temperature resistance and strong alkali resistance, but their defoaming speed and foam suppression time are not ideal. [0003] Simethicone-based defoamers generally have high defoaming performance. The key to use is the emulsification of simethicone. Simethicone-based defoamers are often incompletely emulsified, resulting in demulsification and oil floating during use. Phenomenon, affecting its use effect, the traditional simethicone emulsion defoamer has poor high temper...

Claims

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Application Information

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IPC IPC(8): B01D19/04C08G81/00C08J3/03C08L83/04C09D11/00C09D7/12
Inventor 叶光华常贯儒
Owner 黄山市强力化工有限公司
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