Polyamide resin composition and molded article

Abstract

A polyamide resin composition according to the present invention is characterized by comprising 100 parts by mass of a polyamide resin (A), 0.005-0.3 parts by mass of a copper compound (B), and 10-250 parts by mass of glass fibers (C), and is characterized in that the percentage content of boron elements in the glass fibers (C) is 1 mass% or less with respect to the total mass of the glass fibers (C).

Claims

1. (A) 100 parts by mass of polyamide resin, (B) 0.005 to 0.3 parts by mass of a copper compound, (C) Contains 10 to 250 parts by mass of glass fiber, A polyamide resin composition characterized in that the boron content of the glass fibers (C) is 1% by mass or less relative to the total mass of the glass fibers (C), (D) Further containing at least one of an alkali metal halide and an alkaline earth metal halide, The color difference ΔE from the color tone calculated based on the following formula. ＊ It is 5.4 or less, The ratio of magnesium (Mg) to silicon (Si) elements (Mg / Si) in the glass fiber (C) is 0.01 to 0.

025. The iron content in the glass fiber (C) is greater than 0.30% by mass and less than 0.50% by mass, relative to the total mass of the glass fiber (C). A polyamide resin composition wherein the sodium element content in the glass fibers (C) is greater than 0.56% by mass and less than 1.34% by mass, relative to the total mass of the glass fibers (C). ΔE ＊ =√{(LS ＊ -LB ＊ ) ２ +(aS ＊ -aB ＊ ) ２ +(bS ＊ -bB ＊ ) ２ } (In the above formula, LS ＊ aS ＊ , and bS ＊ The polyamide resin composition was pelletized, and a flat plate molded piece (60 mm x 90 mm, 3 mm thick) was manufactured by injection molding using the obtained pellets. This piece was left in a constant temperature and humidity chamber at room temperature (23°C) and humidity (50%) for 50 hours, and the L of the central part of the molded piece was measured according to JIS-Z8781. ＊ (lightness), a ＊ (Redness), and b ＊ (This means the degree of yellowness.) LB ＊ aB ＊ , and bB ＊ The molded piece, after being left in the constant temperature and humidity chamber for 50 hours, was dried in a nitrogen atmosphere at 100°C for 72 hours, and the L in the center of the molded piece was measured in the same manner as before drying. ＊ a ＊ , and b ＊ (This means...)

2. The (A) polyamide resin is one or more selected from the group consisting of polyamides and copolymerized polyamides. The polyamide is selected from the group consisting of polyamide 6, polyamide 46, polyamide 66, polyamide 610, polyamide 612, polyamide 4T, polyamide 6T, polyamide 6I, and polyamide MXD6. The polyamide resin composition according to claim 1, wherein the copolymerized polyamide is a copolymer comprising at least one selected from the group consisting of polyamide 6, polyamide 46, polyamide 66, polyamide 610, polyamide 612, polyamide 4T, polyamide 6T, polyamide 6I, and polyamide MXD6 as a constituent component.

3. The polyamide resin composition according to claim 2, wherein the (A) polyamide resin comprises (A-1) a main component polyamide and at least one (A-2) a different type of polyamide.

4. The polyamide resin composition according to claim 3, wherein the molecular weight of the (A-2) different polyamide is smaller than that of the (A-1) main component polyamide.

5. The polyamide resin composition according to claim 3, wherein the content of the (A-2) different type of polyamide is 0.01 to 10 parts by mass in 100 parts by mass of the (A) polyamide resin.

6. The polyamide resin composition according to claim 5, wherein the content of the (A-2) different type of polyamide is 0.01 to 8 parts by mass in 100 parts by mass of the (A) polyamide resin.

7. The polyamide resin composition according to claim 1, characterized in that the molar ratio of the content of at least one of (D) alkali metal halides and alkaline earth metal halides to the content of (B) copper compounds is 2 / 1 to 50 / 1.

8. Furthermore, the polyamide resin composition according to claim 1, comprising (E) 0.01 to 5 parts by mass of a coloring agent per 100 parts by mass of the polyamide resin composition.

9. The polyamide resin composition according to claim 8, wherein the (E) coloring agent comprises at least one selected from the group consisting of titanium dioxide, zinc sulfide, zinc oxide, iron oxide, and organic dyes.

10. The polyamide resin composition according to claim 9, characterized in that the (E) coloring agent comprises at least one orange coloring agent.

11. A molded article comprising the polyamide resin composition according to any one of claims 1 to 8.

12. A molded article comprising the polyamide resin composition described in claim 9.

13. A molded article comprising the polyamide resin composition described in claim 10.

14. The molded article according to claim 11, which is an automobile part.

15. A molded body according to claim 12 or 13, which is an automobile part.

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