Molded foam article and method of producing molded foam article

A technology of foam molding and manufacturing method, which is applied in the direction of coating, etc., can solve the problems of rough surface, inability to obtain foaming ratio, poor appearance, etc., and achieve the effect of excellent rigidity

Inactive Publication Date: 2009-01-14
SEKISUI CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, even if such heat-expandable microcapsules are used to produce foamed molded articles, when applied to injection molding, satisfactory foamed molded articles cannot be obtained, and the problems faced are: the desired foaming cannot be obtained ratio (specific gravity); or deformation or poor appearance in the molded product; or even if the desired expansion ratio is obtained, foaming occurs on the surface of the molded product, resulting in a rough surface and poor appearance

Method used

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  • Molded foam article and method of producing molded foam article
  • Molded foam article and method of producing molded foam article
  • Molded foam article and method of producing molded foam article

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～8、 comparative example 1～19

[0148] (Manufacture of heat-expandable microcapsules)

[0149] 8 L of water, 10 parts by weight of colloidal silica (manufactured by Asahi Denka Corporation) as a dispersion stabilizer, and 0.3 parts by weight of polyvinylpyrrolidone (manufactured by BASF Corporation) were put into a polymerization reaction container to prepare an aqueous dispersion medium. Afterwards, an oily mixed liquid composed of monomers, crosslinking agents, volatile expansion agents and polymerization initiators in the compounding amounts shown in Table 1 was added to the aqueous dispersion medium, and further added in the compounding amounts shown in Table 1. Metal cation donors from which to formulate dispersions. The obtained dispersion liquid was stirred and mixed with a homogenizer, charged into a pressurized polymerizer (20 L) replaced with nitrogen, pressurized (0.2 MPa), and reacted at 60° C. for 20 hours, thereby Prepare the reaction product. The obtained reaction product was repeatedly filt...

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Abstract

It is intended to provide a molded foam article which has a high foaming ratio and a light weight and shows an excellent appearance with no surface coarsenss, and a method of producing a molded foam article whereby, in the case of using heat expandable microcapsules in injection molding, the heat expandable microcapsules can evenly expand to give a molded foam article having a high foaming ratio and an excellent appearance. A molded foam article having evenly distributed individual cells characterized in that the cell diameter is from 60 to 120 [mu]m, the specific gravity is 0.6 g/ml or less and the surface roughness is 4 [mu]m or less.

Description

technical field [0001] The present invention relates to a foamed molded article with a high expansion ratio, light weight, and no surface roughness and excellent appearance, and a method for manufacturing the foamed molded article. In the case of thermally expandable microcapsules, the thermally expandable microcapsules are also uniformly expanded, thereby obtaining a foamed molded product with a high expansion ratio and excellent appearance. Background technique [0002] Resin foam can express various properties such as heat shielding, heat insulation, sound insulation, sound absorption, shock resistance, and light weight by changing the state of raw materials or formed air cells, so it can be used in various use. As such a resin foam, for example, on the surface of foamed resins such as foamed polyurethane, foamed polypropylene, foamed polyethylene, and foamed polyvinyl chloride obtained by foaming a chemical foaming agent. A resin sheet made of polyvinyl chloride or ole...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C45/00C08J9/32B29K105/04
Inventor 川口泰广泽尚志
Owner SEKISUI CHEM CO LTD
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