Method for reducing particle size of foaming agent

A technology of foaming agent and particle size, which is applied in the field of ADC foaming agent, can solve the problems such as the ejection of the kettle material, the influence of the yield rate, and the increase of the pressure in the kettle, so as to improve the production efficiency, ensure the production safety, and reduce the significant Effect

Inactive Publication Date: 2015-04-01
HANGZHOU HI TECH FINE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The appearance of foam brings a lot of inconvenience to the production. First of all, because the current domestic production of ADC foaming agents adopts a kettle reaction, the generation of foam is eas

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add biurea to water to make a suspension with a water content of 30%, and add catalyst sodium bromide, promoter ferric chloride (or ferrous chloride) to the suspension, and keep stirring, add biurea 0.5% Tween 80 by mass of urea. Hydrogen peroxide was added dropwise to the above solution and stirred continuously. After the hydrogen peroxide was added dropwise, the stirring was continued for 0.5 hours. After completion, the ADC foaming agent was filtered, washed and dried, and dried at 105°C for 2 hours. The particle size was measured by a Beckman Coulter LS200 particle size distribution analyzer, and the median particle size was 25 μm. And do a blank test, the blank test does not add Tween 80, the obtained particle size is 40 μm.

Embodiment 2

[0025] Add biurea to water to make a suspension with a water content of 40%, and add catalyst sodium bromide, promoter ferric chloride (or ferrous chloride) to the suspension, and keep stirring, the biurea 5% Tween 80 by mass. Hydrogen peroxide was added dropwise to the above solution and stirred continuously. After the hydrogen peroxide was added dropwise, the stirring was continued for 0.5 hours. After completion, the ADC foaming agent was filtered, washed and dried, and dried at 105°C for 2 hours. The particle size was measured by a Beckman Coulter LS200 particle size distribution analyzer, and the median particle size was 20 μm.

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PUM

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Abstract

The invention discloses a method for reducing the particle size of a foaming agent. The method comprises the following steps: (1) adding water into a biurea solid to prepare a biurea suspension liquid of which the water content is 30% to 50%; (2) adding a defoaming agent of which the mass is 0.1% to 5% of the mass of the biurea into the biurea suspension liquid and adding a catalyst sodium bromide of which the mass is 1% to 5% of the mass of the biurea and a catalyst aid, namely an iron agent of which the mass is 0.5% to 2% of the mass of the biurea, and uniformly stirring; (3) continuously adding an excessive amount of an oxidant into the solution, continuously stirring at the temperature of 30 to 80 DEG C, and further stirring for 15-30 minutes after the oxidant is completely added dropwise; (4) after the reaction is ended, filtering and washing the solid, drying in an oven at the temperature of 105 DEG C until the solid is constant in weight, filtering and recycling the mother liquid. The method disclosed by the invention has the beneficial effects that the defoaming agent is taken as an additive, so that a remarkable particle size reduction effect is realized, and particles can be reduced from 40 micrometers to about 25 micrometers in particle size.

Description

technical field [0001] The invention relates to the field of ADC foaming agents, in particular to a method for reducing the particle size of the foaming agent. Background technique [0002] The production methods of ADC foaming agent include urea method, Rasig method and ketazine method. The urea method is the most commonly used method in China, which is to react urea and sodium hypochlorite to produce hydrazine hydrate, then condense hydrazine hydrate with urea to form biurea, and biurea and oxidant to form ADC foaming agent. At present, chlorine gas is generally used as the oxidant in the production of ADC blowing agent in China. However, the production of chlorine gas will produce a large amount of hydrogen chloride, which will cause corrosion to the equipment. The green and environmentally friendly hydrogen peroxide oxidation has always been favored by the ADC blowing agent production industry, but its cost is high, and there will be problems with too coarse particle s...

Claims

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Application Information

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IPC IPC(8): C07C281/20
Inventor 陈海贤董梅
Owner HANGZHOU HI TECH FINE CHEM
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