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Foaming agent subjected to surface modification by fluorosilane and preparation method thereof

A technology of surface modification and foaming agent, which is applied in the field of foaming agent, can solve the problems of easy aggregation of foaming agent particles, failure to show effect, defective products and waste products, etc., to achieve uniform and fine cells, improved dispersion, and surface The effect that can be reduced

Active Publication Date: 2011-09-21
HANGZHOU HI TECH FINE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (3) The effect of hydrogen bonds and chemical bonds on the surface of ultrafine powder particles can also easily lead to mutual adsorption between particles and agglomeration
However, due to the characteristics of the particle structure and the huge surface free energy of the ultrafine foaming agent powder, the foaming agent particles are easily aggregated to form secondary particles, which cannot show the favored ultrafine powder effect. The displayed effect, in serious cases, may even result in defective products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Put 20kg of azodicarbonamide ADCA foaming agent (average particle size 4-6um) in the high-speed mixer, and after turning on the high-speed mixer, spray 0.1kg of fluorosilane liquid on the foaming agent in a mist-like manner, and simultaneously Mix at 400 rpm for 10 minutes to obtain the blowing agent powder of the present invention.

Embodiment 2

[0033] Put 20kg of ADCA foaming agent (average particle size 4-6um) in the high-speed mixer, and after turning on the high-speed mixer, spray 0.2kg of fluorosilane solution (a solution composed of 0.1kg of fluorosilane plus 0.1kg of solvent ethanol) on the foaming agent, while mixing at a speed of 400 rpm for 10 minutes to obtain the foaming agent powder of the present invention.

Embodiment 3

[0035] Put 20kg of ADCA foaming agent (average particle size 4-6um) in the high-speed mixer, turn on the high-speed mixer and add 0.2kg of fluorosilane hydrolyzate (add 0.1kg of fluorosilane to the pH of 3-5 with acetic acid in advance mixed with 0.1kg of water) sprayed on the blowing agent in mist form, mixed at a speed of 400 rpm for 10 minutes, and then baked at 80-105°C for 10-30 minutes to obtain the blowing agent of the present invention powder.

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Abstract

The invention relates to a foaming agent subjected to surface modification by fluorosilane and a preparation method thereof. The foaming agent subjected to surface modification by fluorosilane comprises a foaming agent and fluorosilane; based on 100 weight parts of foaming agent, 0.001 to 10 weight parts of fluorosilane is used; and the grain size of the foaming agent is 1 to 100 mu m. The preparation method comprises the following steps of: adding the fluorosilane into the foaming agent in the weight proportion, and mixing with the foaming agent in a mixer for 10 to 30 minutes, so that the fluorosilane uniformly covers the surface of the foaming agent. The invention has the advantages that: by the treatment method, the surface of the foaming agent is covered by the fluorosilane, good hydrophobicity and dispersibility are shown, and the foaming agent cannot agglomerate for a long time; and the fluidity of the power of the foaming agent and the dispersibility of the foaming agent in thermoplastic resin and rubber can be obviously improved.

Description

technical field [0001] The invention relates to the field of foaming agents, and mainly relates to a fluorosilane surface-modified foaming agent and a preparation method thereof. Background technique [0002] Powder blowing agents are widely used in the foaming of plastics and rubber. Commonly used organic chemical blowing agents include azodicarbonamide (ADCA), N, N'-dinitrosopentamethylenetetramine (DPT), Benzenesulfonyl hydrazide foaming agent (BSH TSH OBSH), etc. Inorganic foaming agents include sodium bicarbonate, ammonium bicarbonate, etc. These foaming agents are usually in powder form. In order to obtain better application effects, foaming agent manufacturers usually use various technical methods and means to make the average particle size of the foaming agent reach about 5-10um, or even more. Low, that is to achieve the so-called ultrafine powder. However, the ultra-fine powder particles are unstable, and the powder will agglomerate or even agglomerate during the ...

Claims

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Application Information

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IPC IPC(8): C08J9/04C08J9/10C08J9/08
Inventor 谢雪源陈海贤
Owner HANGZHOU HI TECH FINE CHEM
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