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A kind of expandable microsphere foaming agent, its preparation method and foaming material

A technology of expanding microspheres and foaming agents, which is applied in the field of foaming materials, can solve problems such as carbonization of the shell of microsphere foaming agents, negative effects on the performance of foaming matrix, loss of airtightness and controllability of cells, and achieve foaming Pore ​​stability, good controllability of foaming, relatively stable effect

Active Publication Date: 2021-07-09
广东广纳新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Microsphere blowing agents are rarely used in metal foams. The main reason is that the shell of traditional expandable microsphere blowing agents is a thermoplastic polymer organic compound, and the melting temperature of metals is much higher than its decomposition temperature, resulting in The shell of the microsphere foaming agent is carbonized and decomposed, and the cells lose their airtightness and controllability, which will also have a negative impact on the performance of the foaming matrix in all aspects

Method used

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  • A kind of expandable microsphere foaming agent, its preparation method and foaming material

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preparation example Construction

[0026] The application also provides a preparation method of expandable microsphere blowing agent, comprising the following steps:

[0027] A) Sodium carbonate, stabilizing agent and silane coupling agent are dispersed in solution, heating, obtain the sodium carbonate dispersion liquid of silane modification;

[0028] B) reacting the sodium carbonate dispersion and the silicon source under alkaline conditions, and obtaining an expandable microsphere foaming agent after vacuum drying.

[0029] In the process of preparing the expandable microsphere foaming agent, sodium carbonate, a stabilizer and a silane coupling agent are first dispersed in a solution and heated to obtain a silane-modified sodium carbonate dispersion. The above-mentioned sodium carbonate is also called soda ash and soda, and is an important chemical raw material with a melting point of 851°C and a decomposition temperature of 1744°C; the sodium carbonate used in the present invention is Class I that meets the...

Embodiment 1

[0038] Embodiment 1 provides a kind of inorganic expandable microsphere blowing agent, detailed preparation steps are as follows:

[0039] Dissolve 10 mg of sodium alginate in 5 mL of deionized water in a beaker, then take the beaker and weigh 1.5 g of sodium carbonate and disperse it in 100 mL of absolute ethanol, pour the above solution into a three-necked flask in a water bath at 50°C and stir, and add 2 mL of γ -Aminopropyltriethoxysilane, then magnetically stirred for 60 minutes to obtain a silane-modified sodium carbonate dispersion; then the three-necked flask was transferred to a normal temperature water bath for stirring at 120 rpm, and a small amount of ammonia water was added to the dispersion with a pipette gun until the pH = 11.5, then slowly add 2mL tetraethyl orthosilicate drop by drop, and stir for 1h; finally, the reaction product is first pickled with dilute hydrochloric acid to remove unreacted sodium carbonate, and then washed repeatedly with absolute ethano...

Embodiment 2

[0042] Embodiment 2 provides a kind of inorganic expandable microsphere foaming agent, detailed preparation steps are as follows:

[0043] Dissolve 10 mg of sodium alginate in 5 mL of deionized water in a beaker, then take the beaker to weigh 5 g of sodium carbonate and disperse it in 100 mL of absolute ethanol, pour the above solution into a three-necked flask in a water bath at 50°C and stir, and add 2 mL of γ- Aminopropyltriethoxysilane, and then magnetically stirred for 60 minutes to obtain a silane-modified sodium carbonate dispersion; then transfer the three-necked flask to a normal temperature water bath at 120rpm to stir, and use a pipette to take a small amount of ammonia water and add it to the dispersion pH = 11.5 , then slowly add 2 mL of tetraethyl orthosilicate drop by drop, and stir for 1 h; finally, the reaction product is first pickled with dilute hydrochloric acid to remove unreacted sodium carbonate, then washed repeatedly with absolute ethanol and deionized ...

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Abstract

The invention provides an expandable microsphere foaming agent, which is composed of sodium carbonate and silicon dioxide coated on the surface of the sodium carbonate. The application also provides a preparation method of the expandable microsphere foaming agent. The encapsulation of the inorganic component silicon dioxide in the expandable microsphere foaming agent of this application is conducive to the uniform dispersion of the foaming component sodium carbonate in the matrix, and the expansion of the inorganic expandable microsphere foaming agent at high temperature, closed-cell foaming, It has the advantages of good controllability of foaming and relatively stable cells.

Description

technical field [0001] The invention relates to the technical field of foaming materials, in particular to an expandable microsphere foaming agent, a preparation method thereof and a foaming material. Background technique [0002] Foaming agent is a material that makes the target substance form holes, and it is widely used in the fields of rubber foam, plastic lightweight, silicate foam and metal foam. Foaming agents can be divided into chemical foaming agents and physical foaming agents. Among them, physical foaming agents are generally low-boiling liquids that vaporize and expand after heating to achieve foaming effects; chemical foaming agents can be divided into inorganic foaming agents. There are two types of foaming agents and organic foaming agents: inorganic foaming agents are generally endothermic, such as carbonates, nitrates and hydrides, etc., and decompose slowly; organic foaming agents are generally exothermic, such as azo It is a foaming agent and a sulfonyl ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/08
CPCC22C1/08
Inventor 吴长征谢毅
Owner 广东广纳新材料有限公司
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