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Preparation method of expandable microspheres

A technology of expanding microspheres and microspheres, which is applied in the field of preparation of expandable microspheres, can solve problems such as poor thermal stability, achieve good thermal stability, reduce the loss of blowing agent, and reduce the failure rate

Pending Publication Date: 2021-12-31
崔宾
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The main purpose of the present invention is to propose a preparation method of expandable microspheres, which aims to solve the problem of poor thermal stability of products in existing preparation methods

Method used

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  • Preparation method of expandable microspheres
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  • Preparation method of expandable microspheres

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preparation example Construction

[0040] refer to figure 1 , the preparation method of the expandable microspheres comprises the following steps:

[0041] Step S10, adding sodium chloride, a dispersant and ethanol to the water to form a water phase.

[0042] In this embodiment, sodium chloride, dispersant and ethanol are added to water to form an aqueous phase for future use. Among them, sodium chloride can reduce the solubility of monomers and expandable microspheres in water, and prevent the aggregation of expandable microspheres; the dispersant can play a role in maintaining stability, so that each raw material component remains suspended in the system, so that Suspension polymerization forms microspheres. Specifically, in this embodiment, the dispersant includes silicon dioxide. In addition, the dispersant may also be magnesium hydroxide.

[0043] Step S20, adding monomer, methyl acrylate, foaming agent and crosslinking agent into the water phase, and ultrasonically making the dispersion uniform to obtai...

Embodiment 1

[0069] (1) Add 750 parts of sodium chloride to 3000 parts of water and mix evenly, then add 90 parts of silica sol and 15 parts of ethanol, and stir thoroughly to obtain an aqueous phase;

[0070] (2) Add 122 parts of acrylonitrile, 408 parts of methacrylonitrile, 160 parts of methacrylic acid, 120 parts of acrylamide, 80 parts of methyl acrylate, 90 parts of isooctane, and 180 parts of isopentane to the water phase successively. 6 parts and 6 parts of blocked isocyanate crosslinking agents, ultrasonically disperse evenly to obtain emulsion;

[0071] (3) Add 4.2 parts of ascorbic acid and 3.8 parts of tert-butyl hydroperoxide to the emulsion, heat up to 35°C for 8 hours, continue to heat up to 60°C, react for 3h, then cool down to 40°C to obtain microsphere-containing mixed solution;

[0072] (4) Centrifuge the mixed solution, collect the microspheres and rinse with water, add polyethylene glycol 60 therein, stir and spray dry to obtain expandable microspheres.

[0073] The ...

Embodiment 2

[0075] (1) Add 750 parts of sodium chloride to 3000 parts of water and mix evenly, then add 80 parts of silica sol and 15 parts of ethanol, stir well to obtain the water phase;

[0076] (2) Add 161 parts of acrylonitrile, 359 parts of methacrylonitrile, 150 parts of methacrylic acid, 100 parts of acrylamide, 70 parts of methyl acrylate, 90 parts of isooctane, and 180 parts of isopentane to the water phase successively. 5 parts and 5 parts of blocked isocyanate cross-linking agents, ultrasonically disperses evenly to obtain an emulsion;

[0077] (3) Add 5.2 parts of ascorbic acid and 4.8 parts of tert-butyl hydroperoxide to the emulsion, heat up to 50°C and react for 8 hours, then continue to heat up to 55°C, react for 3 hours, and then cool down to 40°C to obtain microsphere-containing mixed solution;

[0078] (4) Centrifuge the mixed solution, collect the microspheres and rinse with water, add polyethylene glycol 60 therein, stir and spray dry to obtain expandable microspher...

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Abstract

The invention discloses a preparation method of expandable microspheres. The preparation method of the expandable microspheres comprises the following steps: step S10, adding sodium chloride, a dispersing agent and ethanol into water to form a water phase; step S20, adding a monomer, methyl acrylate, a foaming agent and a cross-linking agent into the water phase, and performing ultrasonic treatment to uniformly disperse to obtain an emulsion; step S30, adding an initiator into the emulsion, heating to 35-50 DEG C, reacting until microspheres are formed, heating to 50-60 DEG C, and continuously reacting to obtain a mixed solution containing microspheres; and step S40, separating the expandable microspheres from the mixed solution, wherein the initiator comprises a water-soluble reducing agent and an oil-soluble oxidizing agent. The invention aims to solve the problem of poor thermal stability of the product prepared by the existing preparation method.

Description

technical field [0001] The invention relates to the technical field of chemical materials, in particular to a preparation method of expandable microspheres. Background technique [0002] Expandable microspheres are particles with a core-shell structure, which use thermoplastic resin as the outer shell, and contain a foaming agent that can be vaporized or generate gas when heated. When the expandable microspheres are heated, the blowing agent vaporizes, and at the same time, the shell softens and the microspheres expand. [0003] At present, the expandable microspheres still have the problems of poor thermal stability and unstable quality in the preparation process. Contents of the invention [0004] The main purpose of the present invention is to propose a method for preparing expandable microspheres, aiming at solving the problem of poor thermal stability of products in existing preparation methods. [0005] In order to achieve the above object, the present invention pr...

Claims

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Application Information

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IPC IPC(8): C08J9/20C08J3/12C08F220/50C08F220/44C08F220/06C08F220/56C08F220/14C08L33/20
CPCC08J9/20C08J3/122C08F220/50C08F220/44C08F220/06C08F220/56C08F220/14
Inventor 崔宾
Owner 崔宾
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