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Polypropylene resin foamed particles and method for producing same

A technology of polypropylene-based resin and foamed particles, which is applied in the field of polypropylene-based resin foamed particles and its manufacturing, to achieve excellent hue effects

Active Publication Date: 2019-11-26
KANEKA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This document discloses the invention of obtaining an in-mold expanded molded product without color unevenness by injection foam molding, but there is no description on obtaining gray expanded particles with excellent hue.

Method used

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  • Polypropylene resin foamed particles and method for producing same
  • Polypropylene resin foamed particles and method for producing same
  • Polypropylene resin foamed particles and method for producing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0199] [Production of polypropylene-based resin pellets]

[0200] With respect to 100 parts by weight of polypropylene-based resin, 4 parts by weight of carbon black, 0.5 part by weight of polyethylene glycol, 0.05 part by weight of talc, and 0.10 part by weight of magnesium hydroxide were measured and dry-blended. Using a twin-screw extruder [Toshiba Machine Co., Ltd., TEM26-SX], the dry-blended mixture was melt-kneaded at a resin temperature of 220°C, and the extruded strands were water-cooled in a water tank with a length of 2 m. It cut|disconnected and produced the polypropylene resin pellet (1.2 mg / pellet).

[0201] [Production of Polypropylene Resin Expanded Particles]

[0202] Into a pressure-resistant autoclave with a capacity of 10 L, 100 parts by weight (2.4 kg) of the polypropylene-based resin particles obtained as described above, 200 parts by weight of water, and tricalcium phosphate as a poorly water-soluble inorganic compound (manufactured by Taihei Chemical In...

Embodiment 2～9、 comparative example 1～13

[0206] In [Preparation of polypropylene-based resin particles], the types of additives and resin formulations were changed as shown in Tables 1 and 2, and in [Preparation of polypropylene-based resin foamed particles], as shown in Tables 1 and 2 A polypropylene-based resin pellet, a polypropylene-based resin foamed pellet, and a polypropylene-based resin in-mold foamed molded product were produced by the same operation as in Example 1, except that the foaming formulation was changed in this manner. Tables 1 and 2 show the evaluation results in the obtained expanded polypropylene-based resin particles and polypropylene-based resin in-mold foamed molded articles. Furthermore, in figure 1 In (1), a schematic diagram showing the color of the surface of the in-mold foamed molded body obtained in Comparative Example 2 of the present application is shown in figure 1 In (2), a schematic diagram showing the color of the surface of the in-mold foamed molded body obtained in Comparati...

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Abstract

Provided are polypropylene resin foamed particles with which an in-mold foam molded article that has a uniform gray color with excellent tone can be obtained. Polypropylene resin particles which are formed by adding carbon black and at least one selected from magnesium hydroxide and magnesium carbonate to a polypropylene resin are dispersed, together with carbon dioxide, in an aqueous dispersion medium in an airtight container and heated to the softening temperature of the polypropylene resin particles or higher and pressurized. The result is discharged in a pressure region lower than the internal pressure of the airtight container to produce uniform polypropylene resin foamed particles that have an excellent color tone.

Description

technical field [0001] The present invention relates to polypropylene-based resin expanded particles and a method for producing the same. Background technique [0002] An in-mold foamed molded product obtained by filling a mold with polypropylene-based resin foamed particles and heat-molding has the advantages of an in-mold foamed molded product, ie, flexibility in shape, light weight, and thermal insulation properties. In addition, compared with the in-mold foamed molded article using the same synthetic resin foamed particles, the chemical resistance, chemical resistance, and chemical resistance of the in-mold foamed molded article obtained by using the polystyrene resin foamed particles were compared. Excellent thermal properties and strain recovery rate after compression. Moreover, compared with the in-mold foaming molding using polyethylene-type resin expanded particle, it is excellent in dimensional accuracy, heat resistance, and compressive strength. [0003] Based o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/18
CPCC08J9/18C08J2323/10C08J9/0061C08J9/122C08J2203/06C08J9/232B29C44/3461B29K2023/12C08J9/228C08J2203/22C08J2205/044C08J2323/12C08K3/04C08K3/22C08K3/26C08K3/34C08K2003/2224C08K2003/267C08K2003/343
Inventor 望月义之糸井章裕
Owner KANEKA CORP
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