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Heat-expandable microsphere and use thereof

A heat-expandable microsphere and thermoplastic resin technology, applied in the preparation of microspheres, microcapsule preparation, and other chemical processes, etc., can solve the problems of expansion ratio, specific gravity fluctuation, foaming ratio change, unstable component quality, etc. Excellent foam stability, less variation in specific gravity, and excellent specific gravity stability

Pending Publication Date: 2021-02-26
MATSUMOTO YUSHI SEIYAKU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to fluctuations in the heating process time, the expansion ratio changes, resulting in fluctuations in the expansion ratio and specific gravity of the obtained member, and there is a problem that the quality of the member is unstable.
[0008] Although the conventional heat-expandable microcapsules described in Patent Document 1 can obtain a highly foamed member by heating for a short time, it cannot be said that the foaming stability is sufficient due to fluctuations in heating time.

Method used

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  • Heat-expandable microsphere and use thereof
  • Heat-expandable microsphere and use thereof
  • Heat-expandable microsphere and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0179] [Example 1 (Table 1)]

[0180] After adding 115 g of sodium chloride, 65 g of colloidal silica having an active ingredient of 20% by weight, 1 g of polyvinylpyrrolidone, and 0.1 g of carboxymethylated polyethyleneimines to 500 g of ion-exchanged water, the The pH of the obtained mixture was adjusted to 2.5 to 3.5 to prepare an aqueous dispersion medium.

[0181] Separately, 70 g of acrylonitrile, 90 g of methacrylonitrile, 40 g of methyl acrylate, 1 g of trimethylolpropane trimethacrylate, 3 g of dilauroyl peroxide, and 70 g of isobutane were mixed to prepare an oily mixture.

[0182] The aqueous dispersion medium is mixed with the oily mixture, and the resulting mixed solution is dispersed at a speed of 10,000 rpm for 1 minute using a homomixer (manufactured by Primix Corporation, TK homomixer), and then the initial pressure of the reaction is 0.5 MPa. The polymerization reaction was carried out at a reaction temperature of 70° C. for 20 hours while stirring. ...

Embodiment 2～15 and comparative example 1～7

[0187] Heat-expandable microspheres (microspheres 2 to 22) were obtained in the same manner as in Example 1 except that the oily mixture was changed to those shown in Tables 1 to 3. The average particle diameter, expansion start temperature, maximum expansion temperature, maximum expansion ratio, ΔT, and E of each heat-expandable microsphere obtained were evaluated. c , G c . The results are shown in Tables 1-3.

[0188] [Table 1]

[0189]

[0190] [Table 2]

[0191]

[0192] [table 3]

[0193]

[0194] In Tables 1 to 3, the following abbreviations are used.

[0195] AN: acrylonitrile

[0196] MAN: methacrylonitrile

[0197] MA: methyl acrylate

[0198] EA: ethyl acrylate

[0199] BA: n-butyl acrylate

[0200] MMA: methyl methacrylate

[0201] VAc: vinyl acetate

[0202] MAA: methacrylic acid

[0203] TMP: Trimethylolpropane trimethacrylate

[0204] Isobutane: 2-Methylpropane

[0205] Isopentane: 2-Methylbutane...

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Abstract

The purpose of the present invention is to provide: a heat-expandable microsphere which has excellent foam stability, and of which the expansion ratio or specific gravity varies little even when heating time is changed; and a use thereof. This heat-expandable microsphere comprises: an outer shell formed of a thermoplastic resin; and a foaming agent which is encapsulated in the outer shell and evaporated by heating, wherein the thermoplastic resin is a polymer of a polymerizable component including acrylonitrile, methacrylonitrile, and acrylic ester, and satisfies a specific condition.

Description

technical field [0001] The present invention relates to heat-expandable microspheres and their use. Background technique [0002] Heat-expandable microspheres having a structure in which a thermoplastic resin is used as an outer shell and a foaming agent vaporized by heating are enclosed therein are also called heat-expandable microcapsules, and have a property of expanding by heating. Due to this property, heat-expandable microspheres are used in a wide range of fields such as foaming inks, design-imparting agents for members such as wallpapers, and weight-lightening agents for members such as resins and paints. [0003] A chemical foaming agent is also widely used as a foaming agent for foaming ink, resin, etc. As a characteristic of a chemical foaming agent, it decomposes at a certain temperature and generates gas, thereby foaming components such as ink . Although it has the feature of obtaining a high-foaming body instantaneously, it is concerned about the safety due t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/00C08F2/44C08J9/32
CPCC08F2/44C08J9/32C09K3/00C08F220/44B01J13/185C08F2/30C09D133/18C09D7/69C09D7/70C09D7/65C08K7/22C08K9/10C08F220/14C09D201/00C08J9/20B01J13/18C08F2/16C08F220/42C09D5/031
Inventor 藤井伸彰德村幸子三木胜志
Owner MATSUMOTO YUSHI SEIYAKU
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