Thermal expansion microsphere with particle size of 1-100 microns prepared by emulsion polymerization

A heat-expandable microsphere and emulsion polymerization technology, which is applied in the field of polymer materials, can solve the problems of long production cycle, complex process, and high production equipment requirements, and achieve the effects of low initiation temperature, simple processing technology, and high utilization rate of blowing agent

Pending Publication Date: 2022-03-08
HUBEI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Although many domestic scholars have participated in the research work of thermally expandable microspheres, from the perspective of industrial production, due to the complex process of producing thermally expandable microspheres, long production cycle, high requirements for production equipment, and the influence of microsphere structure There are many factors related to performance and performance, and it is difficult to synthesize thermally expandable microspheres with uniform particle size distribution, regular shape, high expansion ratio, and excellent foam stabilization performance.

Method used

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  • Thermal expansion microsphere with particle size of 1-100 microns prepared by emulsion polymerization

Examples

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Effect test

Embodiment 1

[0024] A heat-expandable microsphere prepared by emulsion polymerization, composed as follows by mass: 30 parts of acrylonitrile, 10 parts of methyl acrylate, 40 parts of isooctane, 2 parts of allyl-2-propyl sodium ethanesulfonate, peroxide 0.1 part of benzoyl, 30 parts of nano silicon dioxide, 140 parts of water.

[0025] The preparation method of the acrylic acid modified polyimide oligomer solution in the present embodiment is as follows:

[0026] (1) Under normal temperature and pressure, add monomer acrylonitrile and acrylic acid monomer: 3:1 into the reactor, then add 40 parts of isooctane, then add 0.1 part of benzoyl peroxide, and then stir at room temperature , mixed for 30min to obtain a homogeneous oil phase;

[0027] (2) Add 2 parts of allyl-2-propyl sodium ethanesulfonate, 30 parts of rice silica, and 140 parts of deionized water into the reaction vessel at normal temperature and pressure, and stir at normal temperature to obtain a uniform mixture. water box.

...

Embodiment 2

[0031] A heat-expandable microsphere prepared by emulsion polymerization, composed as follows by mass: 50 parts of acrylonitrile, 10 parts of methyl acrylate, 60 parts of isooctane, 2 parts of allyl-2-propyl sodium ethanesulfonate, peroxide 0.2 parts of benzoyl, 50 parts of nano silicon dioxide, and 200 parts of water.

[0032] The preparation method of the acrylic acid modified polyimide oligomer solution in the present embodiment is as follows:

[0033] (1) Under normal temperature and pressure, add monomer acrylonitrile and acrylic acid monomer: 5:1 into the reactor, then add 60 parts of isooctane, then add 0.2 part of benzoyl peroxide, and then stir at room temperature , mixed for 30min to obtain a homogeneous oil phase;

[0034] (2) Add 2 parts of allyl-2-propyl sodium ethanesulfonate, 50 parts of rice silica, and 200 parts of deionized water into the reaction vessel at normal temperature and pressure, and stir at normal temperature to obtain a uniformly mixed water box...

Embodiment 3

[0038] A heat-expandable microsphere prepared by emulsion polymerization, composed as follows by mass: 50 parts of acrylonitrile, 20 parts of methyl acrylate, 50 parts of isooctane, 2 parts of allyl-2-propyl sodium ethanesulfonate, peroxide 0.2 parts of benzoyl, 50 parts of nano silicon dioxide, and 200 parts of water.

[0039] The preparation method of the acrylic acid modified polyimide oligomer solution in the present embodiment is as follows:

[0040] (1) Under normal temperature and pressure, add monomer acrylonitrile and acrylic acid monomer: 5:2 into the reactor, then add 50 parts of isooctane, then add 0.2 part of benzoyl peroxide, and then stir at room temperature , mixed for 30min to obtain a homogeneous oil phase;

[0041] (2) Add 2 parts of allyl-2-propyl sodium ethanesulfonate, 50 parts of rice silica, and 200 parts of deionized water into the reaction vessel at normal temperature and pressure, and stir at normal temperature to obtain a uniformly mixed water box...

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Abstract

In order to overcome the defects and deficiencies in the prior art, the invention aims to adopt a novel synthesis technology and formula to synthesize the thermal expansion foaming microspheres through emulsion polymerization. The efficient thermal expansion microspheres prepared by the novel preparation method comprise the following components in parts by mass: 20-30 parts of acrylic monomers, 50-80 parts of acrylonitrile, 1-2 parts of a cross-linking agent, 40-80 parts of a foaming agent, 0.2-0.6 part of an oxidant, 1-2 parts of an emulsifier, 0.5-2 parts of a co-emulsifier, 0.2-0.6 part of a reducing agent, 3-6 parts of a stabilizer and 100-250 parts of water. The method has the advantages that the foaming agent utilization rate is higher; the thermal expansion microspheres are higher in strength; the thermal expansion microspheres are more uniform and smaller in particle size distribution, smooth in surface and perfect in core-shell structure.

Description

[0001] Technical Field The present invention relates to a novel preparation method, emulsion polymerization to prepare thermally expandable foamed microspheres, which belongs to the technical field of polymer materials. [0002] technical background [0003] Thermally expandable microspheres are a type of microcapsules, which refer to particles with a core-shell structure formed by enclosing the core of a foaming agent with a polymer shell. When the microspheres are heated to the softening point of the polymer, the vapor pressure generated by the internal foaming agent expands the microspheres, and after cooling, the microspheres will remain foamed. Due to its light weight and uniform foaming properties, expanded microspheres are widely used in heat insulation, sound insulation, weight reduction, shock absorption, etc., and thermally expandable microspheres have also been extensively studied. At present, there are two main methods for preparing thermally expandable microspheres...

Claims

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Application Information

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IPC IPC(8): C08J9/16C08F220/44C08F4/40C08F2/26C08J9/32
CPCC08J9/16C08F220/44C08F4/40C08F2/26C08J9/32C08J2203/22C08J2333/20C08F220/14
Inventor 洪诚郝同辉张群朝
Owner HUBEI UNIV
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