Aromatic polyester-based resin foam particles for in-mold foam molding, method for producing same, in-mold foam molded body, composite structural member, and member for automobile

Abstract

The present invention provides aromatic polyester-based resin foam particles for in-mold foam molding, whereby it is possible to produce an in-mold foam molded body having a long post-production storage life and also offering excellent mechanical strength and outer appearance. These aromatic polyester-based resin foam particles for in-mold foam molding are characterized in comprising an aromatic polyester-based resin and in that the residual ratio of carbon dioxide when 7 hours have elapsed since 24 hours of impregnation with the carbon dioxide under conditions of 25 DEG C and 1 MPa is 5 wt% or more.

Description

technical field [0001] The present invention relates to aromatic polyester resin foamed particles for in-mold foam molding, a method for producing the same, an in-mold foam molded article, a composite structural member, and a member for automobiles. In the following description, "foamed aromatic polyester-based resin particles for in-mold foam molding" may be simply referred to as "foamed aromatic polyester-based resin particles". Background technique [0002] In-mold foam molding has been conventionally used as a method of producing an aromatic polyester resin foam molded article by foaming the foamed aromatic polyester resin particles. In-mold foam molding refers to a molding method that includes the following steps: the process of filling the foamed particles of aromatic polyester resin in the mold; Secondary foamed particles obtained by heating and foaming the foamed resin particles, and secondary foaming of the foamed aromatic polyester resin particles by the foaming p...

AI Technical Summary

Problems solved by technology

[0007] As shown in the comparative example, the above-mentioned primary expanded particles are produced by cutting the strand-shaped foam using a granulator or the like, and are formed in a substantially cylindrical shape, and have poor filling properties into the mold. a question

In addition, although the pre-expanded particles obtained by re-expanding (pre-expanding) the primary expanded particles have improved the above-mentioned problems, they still have an approximately cylindrical shape and poor filling properties in the mold. question

[0008] Furthermore, since the primary expanded particles are produced by cutting the cooled strand-shaped foam, the resulting primary expanded particles and pre-expanded particles expose the cell section at the cut surface, and the primary expanded particles and the pre-expanded particles are used. The foamed molded product obtained by in-mold foam molding of foamed particles has a state in which bubbles are partially scattered on the surface, and there is a problem that a patchy pattern can be observed on the surface and the appearance is low.

[0009] Moreover, since the primary expanded particles are produced by cutting the cooled strand-shaped foam, the obtained primary expanded particles expose the cell cross-section at its cut surface, the porosity is high, and the retention of the foamed gas is poor.

Therefore, when the primary expanded particles are used for in-mold foam molding, there is a problem that the foaming pressure of the primary expanded particles becomes insufficient, and the obtained expanded particles cannot be thermally welded and integrated sufficiently. Low mechanical properties of moldings

In addition, when the foaming pressure of the primary foamed particles is not sufficient, there is a method of impregnating gas such as carbon dioxide into the foamed particles to impart internal pressure to the foamed particles before in-mold foam molding. Gas retention is poor, so there is also a problem of short storage time (molding life) after manufacturing or internal pressure application

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