Fiber-reinforced polyamide resin composition, molded article, sliding member, gear, worm wheel, and method for manufacturing thermoplastic resin composition
AssigneeAsahi Kasei Kabushiki Kaisha
InventorsAyaka NAKAHARA, Tetsuo KURIHARA
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Abstract
The fiber-reinforced polyamide resin composition of the present invention contains a crystalline polyamide (A1) and glass fibers (B1), wherein the formic acid-relative viscosity of the fiber-reinforced polyamide resin composition is 90 or higher, the insoluble content when the fiber-reinforced polyamide resin composition is dissolved in formic acid is 105% by mass or higher relative to the ash content of the fiber-reinforced polyamide resin composition, and within the glass fibers (B1) contained in the fiber-reinforced polyamide resin composition, the proportion of glass fibers having a fiber length of 250 μm or less is not more than 55%.
Claims25
A fiber-reinforced polyamide resin composition comprising a crystalline polyamide (A1) and glass fibers (B1), wherein
- a formic acid relative viscosity of the fiber-reinforced polyamide resin composition is 90 or higher,
- an insoluble component when the fiber-reinforced polyamide resin composition is dissolved in formic acid is 105% by mass or higher relative to an ash content of the fiber-reinforced polyamide resin composition, and
- within the glass fibers (B1) contained in the fiber-reinforced polyamide resin composition, a proportion of glass fibers having a fiber length of 250 μm or less is not more than 55%.
A method for manufacturing a thermoplastic resin composition, the method comprising:
- melt-kneading by adding at least 5 parts by mass but not more than 100 parts by mass of glass fibers having an average fiber diameter of at least 3 μm but not more than 15 μm per 100 parts by mass of a thermoplastic resin having a viscosity value RV of at least 25 but not more than 70, and then conducting melt-kneading to obtain a melt-kneaded product, and
- heating the melt-kneaded product at a temperature T represented by general formula (I) shown below to obtain a thermoplastic resin composition, wherein
- the melt-kneaded product is composed of elliptical cylinder-shaped pellets, and a ratio a/b between a long diameter a and a short diameter b in a cross-section of the elliptical cylinder-shaped pellets is within a range from 1.3 to 3.0, and
- the heating involves conducting heating while stirring the elliptical cylinder-shaped pellets:
- Tm
- -
- 130
-
- °
-
- C
- .
- ≤
- T
- ≤
- Tm
- -
- 10
-
- °
-
- C
- .
- (
- I
- )
- (wherein Tm represents a melting point of the thermoplastic resin).
A method for manufacturing a thermoplastic resin composition, the method comprising:
- melt-kneading by adding at least 5 parts by mass but not more than 100 parts by mass of glass fibers having an average fiber diameter of at least 3 μm but not more than 9 μm per 100 parts by mass of a thermoplastic resin having a viscosity value VN of at least 80 but not more than 200, and then conducting melt-kneading to obtain a melt-kneaded product, and
- heating the melt-kneaded product at a temperature T represented by general formula (I) shown below to obtain a thermoplastic resin composition, wherein
- in the heating, 0.05 to 1.0% by mass of water is included relative to 100% by mass of the melt-kneaded product obtained in the melt-kneading:
- Tm
- -
- 130
-
- °
-
- C
- .
- ≤
- T
- ≤
- Tm
- -
- 10
-
- °
-
- C
- .
- (
- I
- )
- (wherein Tm represents a melting point of the thermoplastic resin).
Dependencies are inferred from the claim text.