Heat-expandable microcapsules, production method therefor, and foamed molded article

A heat-expandable microcapsule technology, applied in the field of heat-expandable microcapsules, can solve problems such as increased expansion rate and achieve the effect of easy manufacture

Active Publication Date: 2020-04-21
NIPPON OIL & FATS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And, if heating is continued, the expansion ratio (expansionratio) will further increase

Method used

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  • Heat-expandable microcapsules, production method therefor, and foamed molded article
  • Heat-expandable microcapsules, production method therefor, and foamed molded article
  • Heat-expandable microcapsules, production method therefor, and foamed molded article

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0123] Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited thereto.

[0124]

[0125]

[0126] To 198 g of ion-exchanged water, 12.5 g of a silica sol aqueous dispersion (trade name "SNOWTEX-O", manufactured by Nissan Chemical Industries, Ltd.), 0.075 g of polyvinylpyrrolidone, and 52 g of sodium chloride were added with a solid content of 20% by mass. It mixed and added 36 mass % of hydrochloric acid so that pH might become 3.0, and adjusted the aqueous dispersion medium.

[0127] On the other hand, 20.0 g of acrylonitrile, 19.2 g of methacrylonitrile, 10.9 g of methacrylic acid (mass ratio: acrylonitrile / methacrylonitrile / methacrylic acid=40 / 38 / 22), 15.0 g of isooctane (30 parts by mass relative to 100 parts by mass of the monomer mixture) as a volatile substance, bis(2-methacryloxyethyl) as an organic peroxide represented by general formula (1) base) 3.26 g of peroxydicarbonate (purity...

Embodiment 2～7 and comparative example 1～7

[0132] Thermally expandable microcapsules were produced in the same manner as in Example 1, except that the various components constituting the oily liquid mixture used in Example 1, their amounts, and polymerization temperature were changed to those shown in Table 1. In addition, a polymerization initiator and the organic peroxide represented by the general formula (1) are used together, or a polymerization initiator is used instead of the organic peroxide represented by the general formula (1). The usage-amount of the organic peroxide represented by General formula (1) and a polymerization initiator shows the net amount except a diluent. Table 1 shows the results of evaluating various physical properties of the obtained heat-expandable microcapsules.

[0133]

[0134] In Table 1, DPHA represents a mixture of dipentaerythritol pentaacrylate and dipentaerythritol hexaacrylate (Sigma-Aldrich reagent);

[0135] TMPTA means trimethylolpropane triacrylate (Tokyo Chemical Indus...

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Abstract

Heat-expandable microcapsules each having a core / shell structure which comprises a core and a shell, wherein the core comprises a volatile substance and the shell comprises a polymer, the polymer being obtained by reacting a monomer mixture with organic peroxide represented by general formula (1). The heat-expandable microcapsules of the present invention have such excellent heat resistance that ayielding phenomenon can be inhibited in a wide temperature range and have a high expansion ratio. (In formula (1), the R1 moieties each independently represent a C2-12 unsaturated hydrocarbon group,the unsaturated hydrocarbon group being optionally separated by one or more of -CO-O-, -O-CO-, and -O-.)

Description

technical field [0001] The present invention relates to a heat-expandable microcapsule, its manufacturing method and foamed molded product. Background technique [0002] In order to reduce the weight of the resin and impart functionality and design, various foam moldings using chemical foaming agents or physical foaming agents have been performed. However, high quality is required for films such as coatings or materials that are prone to outgassing. In the foaming of raw materials such as appearance, etc., thermally expandable microcapsules are used as a foaming agent. [0003] Heat-expandable microcapsules have a core-shell structure, and are also called heat-expandable microspheres, heat-expandable microspheres (microspheres), etc. And vaporize the nuclei of volatile substances. For example, Patent Document 1 discloses that heat-expandable microcapsules can be produced by suspension polymerization of an oily mixed liquid containing a monomer mixture, a volatile substance...

Claims

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Application Information

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IPC IPC(8): C09K3/00B01J13/18C08F2/44
CPCC08F2/44C08F2/20B01J13/185C08J9/16B01J13/18C08F220/285C08F220/282C08F220/56C08J9/22C08J2333/20C08L33/20C08L2207/53
Inventor 林昌树后藤圭二糸山谅介
Owner NIPPON OIL & FATS CO LTD
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