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Preparation method of thermal expansion microspheres

A heat-expandable microsphere and mixing technology, which is applied in the field of preparation of heat-expandable microspheres, can solve the problems of low operation safety, high environmental protection requirements, high toxicity and the like

Inactive Publication Date: 2020-06-05
运研材料科技(上海)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the deficiencies of the prior art, such as high toxicity, low operational safety and high environmental protection requirements, and provide a monomer composition that can replace acrylonitrile monomers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0021] The invention provides a method for preparing heat-expandable microspheres, the heat-expandable microspheres include a thermoplastic resin shell and a foaming agent encapsulated in the shell with a boiling point not higher than the softening point of the thermoplastic resin, wherein the The method includes the following steps:

[0022] (1) Preparation of the oil phase: mixing 80-200 parts by weight of foaming agent, 100 parts by weight of polymerization combined monomer composition, 0.05-5 parts by weight of crosslinking agent and 0.01-10 parts by weight of initiator get oily phase;

[0023] (2) Preparation of the water phase: 0.001-2 parts by weight of a water-soluble composition, 100-800 parts by weight of an aqueous dispersion medium, 5-50 parts by weight of a dispersion stabilizer and 0.005-0.03 parts by weight of an alkali metal nitrite Salt inhibitors are mixed to obtain an aqueous phase;

[0024] (3) Preparation of heat-expandable microspheres: the oil phase in...

Embodiment 1

[0043] (1) Preparation of oil phase: 6g isopentane, 6g isooctane, 8g methyl methacrylate, 2.5g N, N dimethyl acrylamide, 0.2g poly(ethylene glycol) methyl methacrylate , 1g isobornyl methacrylate, 0.5g hexafluorobutyl methacrylate, 0.05g triallyl cyanurate and 0.05g azobisisobutyronitrile, mixed and stirred at 25°C for 10-15min to form a uniform the oil phase;

[0044] (2) Preparation of the water phase: 20g sodium chloride is dissolved in 100g deionized water, then the mass concentration of 20g added is 25% colloidal silicon dioxide solution, 1% polyvinylpyrrolidone aqueous solution and 0.1g dodecane Alkyl sodium sulfate, then add 1.8g of 1% sodium nitrite aqueous solution and stir evenly, then continue to add hydrochloric acid to adjust the pH to 3, and the formed solution is an aqueous phase;

[0045] (3) Homogenization of the water-oil phase: pour the above-mentioned oil phase into the above-mentioned water phase, and disperse the mixed liquid in a homogeneous mixer at 60...

Embodiment 2

[0048] (1) Preparation of oil phase: 6g isopentane, 7g isooctane, 8g methyl methacrylate, 3g N, N dimethyl acrylamide, 0.5g poly(ethylene glycol) methyl methacrylate, 1.2 1g of isobornyl methacrylate, 0.6g of hexafluorobutyl methacrylate, 0.06g of triallyl cyanurate and 0.04g of benzoyl peroxide were mixed and stirred at 25°C for 10min-15min to form a uniform oil phase ;

[0049] (2) Preparation of water phase: 20g sodium chloride is dissolved in 100g deionized water, then adding 20g mass concentration is 25% colloidal silicon dioxide solution, adding 5g 1% polyvinylpyrrolidone aqueous solution and 0.1g dodecane Alkyl sodium sulfate, then add 2g of 1% sodium nitrite aqueous solution and stir evenly, then continue to add hydrochloric acid to adjust the pH to 3, and the formed solution is an aqueous phase;

[0050] (3) Homogenization of the water-oil phase: pour the above-mentioned oil phase into the above-mentioned water phase, and disperse the mixed liquid in a homogeneous mi...

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Abstract

The invention provides a preparation method of thermal expansion microspheres. The thermal expansion microsphere comprises a thermoplastic resin shell and a foaming agent encapsulated in the shell, wherein the boiling point of the foaming agent is not higher than the softening point of the thermoplastic resin. The preparation method comprises the following steps of in an aqueous dispersion medium,suspending and polymerizing a polymerizable component in the presence of a water-soluble composition, wherein a main monomer of the polymerization component adopts an acrylic monomer composition, theshell with high barrier property and a higher glass-transition temperature is formed after polymerization, and a virulent acrylonitrile monomer is not adopted, so that the comprehensive cost of monomer raw materials is reduced, the safety in the production operation process is improved, and the potential pollution risk of the production surrounding environment is reduced.

Description

technical field [0001] The invention relates to a method for preparing heat-expandable microspheres, which belongs to the technical field of preparing heat-expandable microspheres by suspension polymerization. Background technique [0002] The huge expansion ability of thermally expandable microspheres makes it widely used in various fields, for example, it can reduce the quality of products, change the performance of products (such as thermal properties, acoustic properties and electrical insulation properties) and save the amount of materials; The ball also has the advantages of excellent solvent resistance, wear resistance, good mechanical properties, non-toxic and pollution-free. At present, the suspension polymerization method is basically used to prepare thermally expandable microspheres at home and abroad. The suspension polymerization method is a common method for synthesizing functional polymer microspheres. Using the suspension polymerization method, various monome...

Claims

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Application Information

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IPC IPC(8): C08J9/20C08J9/14C08F220/14C08F220/54C08F220/28C08F220/18C08F220/24C08F222/20C08F222/14C08F226/06
CPCC08J9/20C08J9/141C08F220/14C08J2203/14C08J2203/182C08J2333/12
Inventor 潘仕荣周小三
Owner 运研材料科技(上海)有限公司