Preparation method of polyether modified polysiloxane defoaming agent

A polysiloxane defoamer and polyether modification technology, which is applied in the direction of foam dispersion/prevention, can solve the problems of volatile pollution of the environment, toxic solvents, etc., and achieve simple process, excellent foam suppression performance and low cost Effect

Inactive Publication Date: 2013-03-13
TIANJIN PHARMACN MEDICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has the disadvantages of toxic solvents and volatile environment pollution. The present invention adopts the bulk polymerization method to provide a method for preparing polyether-modified polysiloxane polymers and prepare polyether-modified polysiloxanes for defoaming agent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 100g of hydrogen-containing silicone oil with a hydrogen content of 0.1mol / 100g and 80g of acryl polyether with an unsaturation degree of 1.5mmol / g were dehydrated at high temperature, respectively, and added to the reaction kettle, and chloroplatinic acid-isopropanol solution was added dropwise. Chloroplatinic acid accounted for 15ppm of the total reactants, and reacted at 120°C for 30min to obtain a polyether-modified polysiloxane polymer, which was ground through a colloid mill; 70 g of 40% silicone oil emulsion was compounded to prepare a polyether modified polysiloxane defoamer.

Embodiment 2

[0032] 100g of hydrogen-containing silicone oil with a hydrogen content of 0.1mol / 100g and 80g of acryl polyether with an unsaturation degree of 1.5mmol / g were dehydrated at high temperature, respectively, and added to the reaction kettle, and chloroplatinic acid-isopropanol solution was added dropwise. Chloroplatinic acid accounted for 15ppm of the total reactants, and reacted at 100°C for 40min to obtain a polyether-modified polysiloxane polymer, which was ground through a colloid mill; 70 g of 40% silicone oil emulsion was compounded to prepare a polyether modified polysiloxane defoamer.

Embodiment 3

[0034] 100g of hydrogen-containing silicone oil with a hydrogen content of 0.1mol / 100g and 80g of acryl polyether with an unsaturation degree of 1.5mmol / g were dehydrated at high temperature, respectively, and added to the reaction kettle, and chloroplatinic acid-isopropanol solution was added dropwise. Chloroplatinic acid accounted for 30ppm of the total reactants, and reacted at 100°C for 20min to obtain a polyether-modified polysiloxane polymer, which was ground through a colloid mill; 70 g of 20% silicone oil emulsion was compounded to prepare a polyether-modified polysiloxane defoamer.

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Abstract

The invention relates to a preparation method of a polyether modified polysiloxane defoaming agent, which consists of a polyether modified polysiloxane polymer and a silicone oil emulsion. Specifically, the polyether modified polysiloxane polymer is prepared by employing a bulk polymerization method to react hydrogen-containing silicone oil, allyl alcohol polyether and a catalyst. The hydrogen-containing silicone oil has a hydrogen content of 0.01-0.3mol/100g and a viscosity of 10-100cst. The allyl alcohol polyether has an average molecular weight of 200-3000g/mol and an unsaturation degree of 1-2mmol/g. The catalyst is chloroplatinic acid. The hydrogen-containing silicone oil and the allyl alcohol polyether are in a mole ratio of 1:(1-1.4). Compared with the solution method for preparation of the polyether modified polysiloxane polymer, the method provided in the invention has the advantages of no pollution, simple process, controllability, and low cost. The obtained polyether modified polysiloxane polymer can be compounded with the methyl silicone oil emulsion so as to obtain the polyether modified polysiloxane defoaming agent. With excellent defoaming and foam inhibiting properties, the defoaming agent is suitable for high temperature environment.

Description

technical field [0001] The invention relates to a method for preparing polyether modified polysiloxane defoamer. It specifically relates to a polyether-modified polysiloxane polymer prepared by bulk polymerization using hydrogen-containing silicone oil and acryl polyether as main raw materials, and a polyether-modified polysiloxane defoamer prepared. Background technique [0002] Polyether modified polysiloxane defoamer is a new type of high-efficiency defoamer that combines the advantages of silicone defoamer and polyether defoamer, referred to as polyether silicone defoamer. Through polyether graft modification, the hydrophilic polyether segment endows it with water solubility, and the hydrophobic polysiloxane segment endows it with low surface tension, so that the prepared defoamer can self-emulsify in the water system, Good stability, long-lasting defoaming effect, better than silicone oil defoamer and polyether defoamer in defoaming time and foam suppression time. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D19/04
Inventor 李军伟田东奎
Owner TIANJIN PHARMACN MEDICAL TECH
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