METHOD FOR REGENERATING GLASS FIBER-REINFORCED POLYPROPYLENE MATERIAL AND REGENERATED MOLDED ARTICLE OF GLASS FIBER-REINFORCED POLYPROPYLENE MATERIAL

摘要

PROBLEM TO BE SOLVED: To inhibit discoloration when a regenerated molded article is molded from a molded article of a glass fiber-reinforced polypropylene material (FR-PP material), and to produce a good regenerated molded article.

SOLUTION: When a molded article of an FR-PP material is pulverized and this pulverized material is used as a raw material to mold a regenerated molded article, a thioether-based antioxidant is added when the pulverized material is melted by heating and pelletized, or a thioether-based antioxidant is added when the pulverized material is injection molded as it is. Cases (embodiments 1 to 3) of using the thioether-based antioxidant as an antioxidant in recycling can reduce yellowing degree as compared with cases (comparative examples 1 and 2) using no antioxidant and cases (comparative examples 3 to 5) using a phenolic antioxidant.

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