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Method for producing polypropylene type resin foamed particle

A technology of expanded particles and polypropylene, which is applied in the field of manufacturing expanded polypropylene resin particles, which can solve the problems of reduced mechanical strength of expanded particle moldings, and achieve excellent mechanical strength, less adhesion, and high productivity. Effect

Inactive Publication Date: 2005-11-23
JSP CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, there is a problem that the mechanical strength of the expanded bead molded body obtained by molding the expanded bead is reduced.

Method used

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  • Method for producing polypropylene type resin foamed particle
  • Method for producing polypropylene type resin foamed particle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-6、 comparative example 1-5

[0051] Containing 0.12 parts by weight of antioxidant, 0.05 parts by weight of calcium stearate (lubricant) and

[0052] 0.05 parts by weight of erucamide (lubricant), 0.2 parts by weight of a weather resistance imparting agent, ethylene-propylene random copolymer (ethylene content 2.4% by weight, melting point 145°C, MFR = 7g / 10 minutes) Added a foam regulator 0.05 parts by weight, after melting and kneading in the extruder, extrude from the extruder in a strand form, cut the strands so that the ratio of the diameter to the length of the foamed particles is approximately 1.0, and obtain a resin with an average weight of 2 mg per one particle.

[0053] Next, 100 parts by weight of the above-mentioned resin particles, 220 parts by weight of water having the conductivity shown in Table 1, 0.2 parts by weight of a surfactant (sodium dodecylbenzenesulfonate), and Dispersant (kaolin; average particle size 0.40 μm) and dispersion enhancer (aluminum sulfate) in the amount shown in 1...

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Abstract

The present invention relates to a method for producing expanded polypropylene resin particles, wherein favorable expanded particles that are not fused together can be obtained without inconsistencies caused by differences in the amount of dispersant adhering to the expanded particles that are obtained or the amount of dispersant which is added to prevent the resin particles from fusing together during a heat treatment step for ensuring the blowing agent impregnation of resin particles dispersed in an aqueous medium in a pressure tight vessel during the production of expanded polyolefin resin particles using a physical blowing agent, and it is also possible to more consistently produce expanded polyolefin resin particles which fuse together better when such expanded particles are molded, giving moldings with better mechanical strength. The method of the present invention is a method for obtaining expanded particles by allowing polypropylene resin particles impregnated with a physical blowing agent, which have been heated along with an aqueous medium and a dispersant, to be released and expanded at reduced pressure from the interior of a pressure-tight vessel, wherein the aforementioned aqueous medium has an electrical conductivity of from not less than 0.00 mS / m to not more than 20.00 mS / m.

Description

technical field [0001] The present invention relates to a method for producing expanded polypropylene resin particles containing a physical foaming agent from a closed container under low pressure, and foaming them to obtain expanded particles. More specifically, it relates to a method for producing expanded polypropylene-based resin particles, which can prevent the particles from melting and adhering to each other in the process of foaming the resin particles, and at the same time mold the obtained expanded particles. Expanded particles excellent in mutual melt-adhesion. Background technique [0002] Molding polypropylene-based resin into a molded product (hereinafter referred to as expanded particle molded product) has the following advantages: it will not damage the original excellent properties of polypropylene-based resin, and can add properties such as cushioning and heat insulation. Therefore, it is widely used as packaging materials, building materials, heat insulat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/18B29C44/44
CPCC08J2203/06C08J9/18C08J2323/12B29C44/445B29C44/3426
Inventor 佐佐木秀浩荻山和也平晃畅桥本圭一柳泽大树所寿男
Owner JSP CORP
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