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Method for manufacturing foamed polypropylene-resin particles

A technology of polypropylene-based resin and foamed particles, which is applied in the field of manufacturing polypropylene-based resin foamed particles, can solve problems such as the inability to realize the width of molding heating water vapor, and achieve wide width of molding heating water vapor, good formability, The effect of less decrease in physical properties

Active Publication Date: 2015-10-28
KANEKA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method of using water as a foaming agent in combination with air and nitrogen cannot achieve a wide width of molding heating water vapor

Method used

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  • Method for manufacturing foamed polypropylene-resin particles
  • Method for manufacturing foamed polypropylene-resin particles
  • Method for manufacturing foamed polypropylene-resin particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0151] [Manufacture of polypropylene-based resin particles]

[0152] 0.05 parts by weight of talc, After 0.50 parts by weight of polyethylene glycol as a water-absorbing agent, melt-kneading was performed at a resin temperature of 220°C in a φ50mm single-screw extruder [manufactured by Osaka Seiki Works Co., Ltd., model 20VSE-50-28]. The obtained melt-kneaded resin was extruded into strands through a circular die, water-cooled, and then cut with a pelletizer to obtain cylindrical polypropylene-based resin particles with a weight of 1.2 mg / pellet.

[0153] [Manufacture of expanded polypropylene resin particles]

[0154] A pressure-resistant autoclave (pressure-resistant container 3) with a capacity of 10 L is used. image 3 The apparatus shown in the foaming tank 9 is used to produce expanded polypropylene-based resin particles.

[0155] In a pressure-resistant autoclave with a capacity of 10 L, 100 parts by weight of the obtained polypropylene-based resin particles, 170 par...

Embodiment 2

[0159] In [Manufacture of Polypropylene-based Resin Expanded Beads], except that the heating temperature (expansion temperature) of the contents of the autoclave was changed to 149° C., primary expanded bead and molded bead were obtained by the same operation as in Example 1. Inner foam molded body. The obtained primary expanded particles had an expansion ratio of 18 times, a DSC peak ratio of 29%, and a heat deformation rate of 0.0%. The minimum molding heating steam pressure is 0.22 MPa·G, and the fusion property, surface property, and 50% compressive strength are acceptable within the range of the entire heating water vapor pressure up to the high heating water vapor pressure of 0.32 MPa·G. The results are shown in Table 1.

Embodiment 3

[0161] [Manufacture of polypropylene-based resin particles]

[0162] 0.10 parts by weight of talc, Polypropylene-based resin particles were obtained in the same manner as in Example 1, except that polyethylene glycol was 0.50 parts by weight as a water absorbing agent.

[0163] [Manufacture of expanded polypropylene resin particles]

[0164] Using the obtained polypropylene-based resin particles, except that the heating temperature (foaming temperature) of the contents of the autoclave was changed to 136°C, primary expanded particles were obtained by the same operation as in Example 1, and in-mold foam molding body. The obtained primary expanded particles had an expansion ratio of 20 times, a DSC peak ratio of 20%, and a heat deformation rate of -1.0% at the melting point of the resin of 139-15=124°C.

[0165] [Manufacture of polypropylene-based resin in-mold foam molding]

[0166] In-mold foam molding was performed in the same manner as in Example 1, and the moldability a...

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Abstract

These foamed polypropylene-resin particles are obtained as follows: inside a pressure-resistant vessel, polypropylene-resin particles containing polyethylene glycol and / or glycerin are dispersed in an aqueous dispersion medium; carbon-dioxide gas is introduced into said pressure-resistant vessel as a blowing agent; the polypropylene-resin particles are impregnated with said blowing agent under heat and pressure; and the polypropylene-resin particles are then foamed by being discharged into a pressure region that is at a lower pressure than the interior of the pressure-resistant vessel and is at a temperature that is greater than 80°C but no greater than 110°C. This makes it possible to provide foamed polypropylene-resin particles that: can produce a foamed-in-place molded body using a low molding heated-steam pressure; do not lose moldability even if a high molding heated-steam pressure is used; have a wide molding heated-steam range; exhibit good moldability even when a complicatedly shaped mold, a large mold, or the like is used; and do not decrease much in terms of physical properties such as compressive strength when made into a foamed-in-place molded body.

Description

technical field [0001] The present invention relates to a method for producing expanded polypropylene-based resin particles. More specifically, it relates to a method for producing expanded polypropylene-based resin particles that can be used well as a raw material for in-mold foamed molded products in one foaming process, can be molded at low temperatures, and have a wide width of water vapor pressure during molding and heating . Background technique [0002] In-mold foam moldings obtained by filling polypropylene-based resin foamed particles into a mold and heat-molding with steam have the advantages of in-mold foam moldings such as arbitrary shape, light weight, and heat insulation. feature. In addition, when compared with an in-mold foamed molded body using the same synthetic resin expanded particles, chemical resistance, heat resistance, and In addition, it is excellent in dimensional accuracy, heat resistance, and compressive strength compared with in-mold foam mold...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/18
CPCC08J9/0061C08J9/0023C08J9/122C08J9/125C08J9/18C08J9/232C08J2203/06C08J2203/10C08J2203/182C08J2323/14C08J2471/02C08J9/228C08J2201/032
Inventor 福泽淳
Owner KANEKA CORP
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