A kind of preparation method of AC blowing agent

A technology of foaming agent and seed crystal, which is applied in the field of preparation of AC foaming agent, can solve the problems of unable to meet the market demand, wide particle size distribution range, rough particle surface, etc., and achieve the inhibition of crystal growth and particle size distribution range Narrow, high dissolution rate effect

Active Publication Date: 2022-05-20
JIANGXI SELON INDAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Most of the products exported and sold in my country are the original foaming agent AC powder, which has a single variety, and has the characteristics of rough particle surface and wide particle size distribution range.

Method used

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  • A kind of preparation method of AC blowing agent
  • A kind of preparation method of AC blowing agent
  • A kind of preparation method of AC blowing agent

Examples

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preparation example Construction

[0050] A preparation method of AC blowing agent, comprising the following steps:

[0051] (1). Grinding the biurea raw material: filter and wash the synthesized biurea, and ultrafinely pulverize the biurea to a particle size of 4-8 μm;

[0052] (2). Preparation of biurea slurry: Add water to the pulverized biurea to make a biurea slurry containing 20-40% of biurea, and then add biurea with a mass ratio of 0.3-10%. Oxidation aids;

[0053] (3). Generation of seed crystals: The configured 3% to 10% biurea slurry is sprayed at high speed through a liquid injection device, and enters the injection reaction device from an inlet of the injection reaction device, and forms in the injection reaction device. Vacuum, the chlorine gas is sucked into the jet reaction device from another inlet of the jet reaction device, and the two are vigorously mixed in the jet reaction device to form a large number of AC blowing agent seeds in an instant, and the reaction mixture with AC blowing agent...

Embodiment 1

[0066] (1). Grinding the biurea raw material: filter and wash the synthesized biurea, and ultrafinely pulverize the biurea to a particle size of 4-8 μm;

[0067] (2). Preparation of biurea slurry: add water to the pulverized biurea to form a biurea slurry containing 20% ​​biurea, and then add an oxidation aid with a mass ratio of 5% biurea;

[0068] (3). Generation of crystal seeds: the configured 10% biurea slurry is ejected at high speed through a liquid injection device, and enters the injection reaction device from an inlet of the injection reaction device, and a vacuum is formed in the injection reaction device. Chlorine gas is sucked into the jet reaction device from another inlet of the jet reaction device, and the two are violently mixed in the jet reaction device to form a large amount of AC blowing agent crystal seeds instantly, and collect the reaction mixture with the AC blowing agent crystal seeds;

[0069] (4). Mix evenly: add the remaining biurea slurry and the ...

Embodiment 2

[0073] (1). Grinding the biurea raw material: filter and wash the synthesized biurea, and ultrafinely pulverize the biurea to a particle size of 4-8 μm;

[0074] (2). Preparation of biurea slurry: add water to the pulverized biurea to form a biurea slurry containing 35% biurea, and then add an oxidation aid with a mass ratio of 10% biurea;

[0075] (3). Generation of crystal seeds: the configured 10% biurea slurry is ejected at high speed through a liquid injection device, and enters the injection reaction device from an inlet of the injection reaction device, and a vacuum is formed in the injection reaction device. Chlorine gas is sucked into the jet reaction device from another inlet of the jet reaction device, and the two are violently mixed in the jet reaction device to form a large amount of AC blowing agent crystal seeds instantly, and collect the reaction mixture with the AC blowing agent crystal seeds;

[0076] (4). Mix evenly: add the remaining biurea slurry and the A...

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Abstract

The invention relates to a method for preparing an AC foaming agent. In the method, a jet reaction device is used to vigorously mix part of the biurea slurry and chlorine gas, react instantaneously to generate crystal nuclei of the AC foaming agent, and then add the crystal nuclei to the remaining biurea In the urea slurry, an oxidizing agent is added to oxidize to generate AC foaming agent. The advantage of this process is that it can control the particle size and particle size distribution range of the AC blowing agent, which is conducive to improving the stability of the use of the AC blowing agent, and improving the added value of the product and market competitiveness.

Description

technical field [0001] The invention relates to the technical field of AC foaming agent, in particular the invention relates to a preparation method of AC foaming agent. Background technique [0002] AC (scientific name azodicarbonamide) foaming agent can decompose in a very narrow temperature range and produce a large amount of gas in a very short time, and the generated gas and residue are non-toxic, odorless, non-polluting, non-coloring, and non-toxic. Corrosion processing equipment, does not affect the mechanical properties and stability of the product, has good dispersion in plastics and rubber, and forms fine and uniform cells. It is the most widely used organic foaming agent in the world. [0003] An important indicator to measure the quality of AC foaming agent products is the particle size and distribution state of the product. The particle size distribution of existing products is wide and irregular. If the particle size distribution of AC foaming agent is too wide...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C281/20
CPCC07C281/20
Inventor 宋新民郑小辉潘晓海
Owner JIANGXI SELON INDAL
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