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Polymer foamed microsphere and preparation method thereof

A technology of foaming microspheres and polymers, which is applied in the field of polymer microsphere preparation, which can solve the problems of difficult to maintain the shape of foaming microspheres and easy deformation, and achieve the effect of rough surface and large specific surface

Inactive Publication Date: 2021-10-26
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the foamed microspheres prepared by copolymerization of more low glass transition temperature monomers are easily deformed at higher temperatures, and it is difficult to maintain the original shape of the foamed microspheres.

Method used

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  • Polymer foamed microsphere and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) preparation of magnesium hydroxide:

[0031] Under the condition that the molar ratio of Mg and OH in magnesium chloride and sodium hydroxide is 1:4, magnesium chloride is dissolved in deionized water to obtain a magnesium salt solution, and under mechanical stirring, sodium hydroxide solution is added to the magnesium chloride solution, Get Mg(OH) with D50 of 0.05μm 2 Colloidal dispersant.

[0032] (2) Preparation of aqueous composite dispersion liquid phase:

[0033] Slowly add sodium nitrate to Mg(OH) 2 Colloidal dispersant, add deionized water to make electrolyte dissolve completely at the same time, wherein the concentration of sodium nitrate in deionized water is 21wt%, then slowly add its dissolving of dodecyl diphenyl ether disulfonic acid sodium salt, lauryl The concentration of diphenyl ether disulfonic acid sodium salt in deionized water is 0.08wt%, and the aqueous phase composite dispersion is prepared;

[0034] (3) Preparation of polymer foamed micr...

Embodiment 2

[0041] (1) preparation of magnesium hydroxide:

[0042] Under the condition that the molar ratio of Mg and OH in magnesium chloride and sodium hydroxide is 2:5, magnesium chloride is dissolved in deionized water to obtain a magnesium salt solution, and under mechanical stirring, sodium hydroxide solution is added to the magnesium chloride solution, Get Mg(OH) with D50 of 0.50μm 2 Colloidal dispersant.

[0043] (2) Preparation of aqueous composite dispersion liquid phase:

[0044] Slowly add NaCl to Mg(OH) 2 Colloidal dispersant, add deionized water to make electrolyte dissolve completely simultaneously, wherein the concentration of sodium chloride in deionized water is 10wt%, then slowly add sodium lauryl sulfate to make it dissolve, sodium lauryl sulfate is in deionized water The concentration in the ionized water is 0.005wt%, and the aqueous phase composite dispersion is prepared;

[0045] (3) Preparation of polymer foamed microspheres:

[0046](a) Taking the total weig...

Embodiment 3

[0052] (1) preparation of magnesium hydroxide:

[0053] Under the condition that the molar ratio of Mg and OH in magnesium chloride and sodium hydroxide is 1:3, magnesium chloride is dissolved in deionized water to obtain a magnesium salt solution, and under mechanical stirring, sodium hydroxide solution is added to the magnesium chloride solution, Get Mg(OH) with D50 of 0.30μm 2 Colloidal dispersant.

[0054] (2) Preparation of aqueous composite dispersion liquid phase:

[0055] Slowly add NaCl to Mg(OH) 2 Colloidal dispersant, add deionized water to dissolve the electrolyte completely, wherein the concentration of sodium chloride in deionized water is 20wt%, then slowly add sodium lauryl ether sulfate to dissolve, sodium lauryl ether sulfate The concentration in deionized water is 2wt%, and the aqueous phase composite dispersion is prepared;

[0056] (3) Preparation of polymer foamed microspheres:

[0057] (a) Taking the total weight of ethylenically unsaturated monomer...

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Abstract

The invention discloses a polymer foamed microsphere and a preparation method thereof. The grape-shaped polymer foamed microsphere is composed of a plastic polymer shell and an inert hydrocarbon foaming agent sealed in the microsphere. The foaming agent is vaporized through heating, the shell polymer is expanded under the vaporizing pressure, and the grape-shaped polymer foamed microsphere formed by connecting a plurality of small balls is formed through foaming. The preparation method comprises the following steps: firstly, mixing oil-soluble peroxide, an azo initiator, an acrylonitrile-containing monomer, an acrylamide monomer, other monomers possible for free radical polymerization and a foaming agent to form an oil phase, then emulsifying and dispersing the oil phase in a water-phase composite dispersion liquid containing an electrolyte, an emulsifier and a Mg(OH)2 colloidal dispersant, carrying out micro-suspension polymerization on the obtained emulsified dispersion liquid to obtain a polymer microsphere emulsion containing a foaming agent, and carrying out centrifugal separation, water washing, drying, crushing, foaming and other processes to obtain the polymer foamed microsphere. The method is simple in process operation, mild in reaction condition and good in reaction stability.

Description

technical field [0001] The invention relates to the technical field of preparation methods of polymer microspheres, in particular to a preparation method of polymer foamed microspheres. Background technique [0002] Polymer foamed microspheres are composed of a plastic polymer shell and an inert hydrocarbon foaming agent sealed inside the microspheres. After heat treatment, foaming forms a polymer hollow structure. Due to its large cavity structure, polymer foamed microspheres exhibit the characteristics of heat insulation, heat insulation, shock absorption, sound insulation, and light weight, and are widely used in automotive roofs, automotive fuel tanks, leather, and sealing materials for weight reduction. . [0003] In the prior art, such as patent notification number CN104140549A, in order to facilitate foaming, more comonomers with a lower glass transition temperature, such as acrylate and ethyl acetate, are mainly used in the copolymerization component. However, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/20C08J9/14C08F220/48C08F214/10C08F220/54C08F220/14C08F220/58C08F212/36C08F222/14C08F222/38C08F222/20C08F220/56C08F2/44C08K3/22
CPCC08J9/20C08J9/141C08F220/48C08F214/10C08F2/44C08K3/22C08J2203/14C08K2003/2224C08F220/54C08F220/14C08F220/58C08F212/36
Inventor 刘祥汪舟鹭
Owner NANJING TECH UNIV