Polypropylene resin foamed beads and foam moldings

A foam molding, polypropylene technology, applied in the field of foam molding, can solve the problems of increased aging time, shrinkage of foam molding, obvious tortoise shell pattern, etc., and achieves excellent dimensional stability and good melt adhesion. , the effect of small particle gap

Active Publication Date: 2013-10-23
KANEKA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditionally, this aging generally takes more than 10 hours, and requires a huge aging space and energy costs, so there are serious problems in terms of productivity
In addition, when the deformation of the foamed molded body that occurs immediately after molding is eliminated by the aging process, the fusion-adhesive surface of the foamed particles will also be opened, the particle gap will increase, the tortoise shell pattern will become obvious, and fine wrinkles will occur. The problem
In this way, for the foamed molded article utilizing expanded particles of a polypropylene resin, shrinkage, deformation, or Deterioration of the surface, or the problem of increased aging time

Method used

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  • Polypropylene resin foamed beads and foam moldings
  • Polypropylene resin foamed beads and foam moldings
  • Polypropylene resin foamed beads and foam moldings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0098] As a polyocate resin, the ethylene-acrylic random cluster (K1) recorded at the melting point of 141.5 ° C recorded in Table 1 is used to dry the resin with 0.1 as a talc to the talc to foam. The extruder (Osaka Precision Machine Work (strain) manufacturing, type 20VSE-50-28) is made of melting and mixing. Squeeze out the melting resin from a circular mold head in diameter 2mm into strips, then perform water cooling, and then cut it with a granulator to obtain a polypropylene resin that weighs 1.2 mg / grain. particle.

[0099] 100 weights, 300 water weights of polypropylene resin particles, calcium phosphate (manufactured by Taiping Chemical Industry Corporation) 2 weights (manufactured by a Taiping Chemical Industry Company) of the decentralized additives In the 4.5L resistant high -pressure kettle, add 28 weights as a foaming agent at the same time as the mixing. Heat the content of the high -pressure kettle to the foam temperature at 136.1 ° C. Then, after staying f...

Embodiment 2

[0102] A foamed molded body was obtained in the same manner as in Example 1, except that the air pressure in the expanded polypropylene resin particle (K1B1) was set to 0.18 MPa when the expanded polypropylene resin particle (K1B1) was heat-molded. The evaluation results are shown in Table 3.

Embodiment 3

[0104] Except for using the following ethylene-propylene random copolymer (K2) as the polypropylene resin, the polypropylene-based resin expanded particle (K2B1) and its foamed product were obtained in the same manner as in Example 2. The ethylene-propylene random copolymer (K2) used was obtained by using 5 parts by weight of an ethylene-propylene copolymer oligomer (Mv= The resin obtained by 10000) The melting point is 141.5 ° C. The evaluation results are shown in Table 3.

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Abstract

Foam moldings obtained by packing polypropylene resin foamed beads into a mold and molding the beads by heating with steam, which exhibit little deformation even when the aging time for recovering the shrinkage and deformation after molding is short and which has a small shrinkage factor based on mold dimension and excellent dimensional stability and surface appearance; and polypropylene resin foamed beads which are obtained by expanding a polypropylene resin having a melting point of 125 to 160°C and have a true expansion ratio of 20 to 35, characterized by exhibiting a melt viscosity of 7500 to 12000 poises and a melt tension of 0.5 to 1.8g at 170°C and having cell diameters of 200 to 1000µm.

Description

Technical field [0001] The invention relates to polypropylene resin expanded particles. Specifically, the present invention relates to polyolefin-based expanded particles that can be used to produce a polypropylene-based resin foamed molded article and an expanded molded article made from the polyolefin-based expanded particles. The formed body can be used for buffer packaging materials, containers (circular letters), thermal insulation materials, automobile bumper core materials, etc. Background technique [0002] A foamed molded article obtained by filling a mold with expanded polypropylene resin particles and heating and molding it with water vapor has the advantages of an expanded molded article such as arbitrary shape, light weight, and thermal insulation properties. Furthermore, when compared with an expanded molded article using synthetic resin expanded particles, an expanded molded article using polypropylene resin expanded particles is more durable than an expanded...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/18C08J9/232
CPCC08J9/232C08J2323/12
Inventor 广瀬文信千田健一落越忍常石浩司中山清敬
Owner KANEKA CORP
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