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Thermally foaming microsphere, method for production thereof, use thereof, composition containing the same, and article

A manufacturing method and thermal foaming technology, which are applied in the preparation of microspheres, microcapsule preparations, chemical instruments and methods, etc., can solve the problems of shrinkage, difficulty in controlling the foaming ratio, and difficulty in fully increasing the processing temperature of foaming molding. , to achieve less shrinkage, inhibit early foaming, and improve the effect of foaming start temperature

Inactive Publication Date: 2007-08-08
KUREHA KAGAKU KOGYO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] Like this, it is difficult to fully increase the processing temperature before foam molding with existing thermally foamable microspheres.
In addition, conventional heat-expandable microspheres shrink significantly during foam molding and under high-temperature conditions.
Furthermore, the existing heat-expandable microspheres are difficult to control the desired expansion ratio due to rapid expansion.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0110] (1) Preparation of aqueous dispersion medium

[0111] A water system was prepared by mixing 25 g of 20 wt % colloidal silica, 1.0 g of a 50 wt % diethanolamine-adipic acid condensation product (acid value = 78 mgKOH / g), 0.06 g of sodium nitrite, 89 g of sodium chloride and 276 g of water dispersion medium. Hydrochloric acid was added to this aqueous dispersion medium, and pH was adjusted to 3.2.

[0112] (2) Preparation of polymerizable mixture

[0113] Mixed acrylonitrile 67g, methacrylonitrile 31g, methyl methacrylate 2g, diethylene glycol dimethacrylate 1.5g, isopentane 5g, isododecane 25g and 2,2'-azobisisobutyl 1.2 g of nitrile was used to prepare a polymerizable monomer mixture.

[0114] (3) Suspension polymerization

[0115] The aqueous dispersion medium prepared above and the polymerizable mixture are stirred and mixed with a homogenizer to form fine droplets of the polymerizable monomer mixture in the aqueous dispersion medium. The aqueous dispersion mediu...

Embodiment 2

[0120] The same procedure as in Example 1 was used except that 30 g of a mixture of isopentane and isododecane was replaced by 30 g of a mixture of isopentane, 13 g of isooctane, and 16 g of isododecane as the blowing agent. method, suspension polymerization was carried out to obtain thermally foamable microspheres with an average particle diameter of 51 μm.

[0121] The thermal foamable microspheres obtained above were sampled as they were, and TMA measurement was performed. As a result, the foaming start temperature was 194°C, the maximum foaming temperature was 209°C, and the shrinkage temperature by 50% was 223°C.

[0122] The heat-expandable microspheres were heat-treated at 170°C for 2 minutes and then measured by TMA. As a result, the foaming start temperature was 155°C, the maximum foaming temperature was 193°C, and the 50% shrinkage temperature was 218°C.

[0123] The above-mentioned thermally foamable microspheres were heated at 170°C for 2 minutes, and then the foam...

Embodiment 3

[0125] The foaming agent was suspended in the same manner as in Example 1, except that 30 g of a mixture of isopentane and isododecane was replaced by 30 g of a mixture of 13 g of isooctane and 17 g of isododecane. Polymerization was carried out to obtain thermally foamable microspheres having an average particle diameter of 53 μm.

[0126] The thermal foamable microspheres obtained above were sampled as they were, and TMA measurement was performed. As a result, the foaming start temperature was 200°C, the maximum foaming temperature was 215°C, and the shrinkage temperature by 50% was 225°C.

[0127] The heat-expandable microspheres were heat-treated at 170°C for 2 minutes and then measured by TMA. As a result, the foaming start temperature was 163°C, the maximum foaming temperature was 193°C, and the shrinkage temperature by 50% was 220°C.

[0128] The above-mentioned thermally foamable microspheres were heated at 170°C for 2 minutes, and then the foaming ratio R1 when heated...

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Abstract

A thermally forming microsphere having a structure in which a foaming agent is encapsulated in an outer shell formed from a polymer, wherein said foaming agent comprises isododecane; and a method for producing a thermally forming microsphere by a suspension polymerization method using a foaming agent containing a polymerizable monomer and isododecane.

Description

technical field [0001] The present invention relates to a thermally foamable microsphere having a structure in which a foaming agent is enclosed in a shell made of a polymer, and a method for producing the same. Further, the present invention relates to the use of heat-expandable microspheres as a heat-expandable foaming agent, a composition containing heat-expandable microspheres and a polymer material, and a composition containing heat-expandable microspheres for thermal expansion. Items of foam particles obtained by foaming. Background technique [0002] Heat-expandable microspheres, also known as heat-expandable microcapsules, are formed by microencapsulating a volatile liquid blowing agent with a polymer. Thermally foamable microspheres are generally produced by suspension polymerization of a polymerizable mixture containing at least one polymerizable monomer and a volatile blowing agent in an aqueous dispersion medium. As the polymerization reaction proceeds, a shell...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/00B01J13/14
CPCB01J13/14
Inventor 江尻哲男松崎光浩远藤俊藏
Owner KUREHA KAGAKU KOGYO KK
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