Pipe-shaped integrally molded article and production method for pipe-shaped integrally molded article

Patent metadata

Field	Value
Publication number	US-11241818-B2
Application number	US-201916635095-A
Country	US
Kind code	B2
Filing date	Jan 10, 2019
Priority date	Jan 15, 2018
Publication date	Feb 8, 2022
Grant date	Feb 8, 2022

Abstract

Provided are: a pipe-shaped integrally molded article which is formed by molding a polyphenylene sulfide resin composition, and which has, at one or more portions thereof, at least one selected from different-shape sections, bent sections, and different-diameter sections, the pipe-shaped integrally molded article being characterized in that the total length L (mm) thereof is 1000 or more, and the ratio (L/D) of the total length L (mm) to the outer diameter D (mm) of the pipe-shaped integrally molded article is 20 or more: and a production method for the pipe-shaped integrally molded article. According to the present invention, it is possible to efficiently provide a pipe-shaped integrally molded article having a desired large length and including a three-dimensionally complicated shape, by using a PPS resin composition having excellent heat resistance and chemical resistance.

First claim

The invention claimed is:

1. A pipe-shaped integrally molded article, formed by molding a polyphenylene sulfide resin composition, and having, at one or more portions thereof, at least one selected from a different-shape section, a bent section and a different-diameter section, wherein
a total length L (mm) of the pipe-shaped integrally molded article is 1000 or more,
a ratio (L/D) of the total length L (mm) to an outer diameter D (mm) of the pipe-shaped integrally molded article is 20 or more,
a melt tension N (mN) at breakage of the polyphenylene sulfide resin composition is 10 or more and 50 or less,
the polyphenylene sulfide resin composition is compounded with
(b) 5 to 100 parts by weight of a polyolefin-based resin and
(c) 10 to 45 parts by weight of an inorganic filler relative to
(a) 100 parts by weight of a polyphenylene sulfide resin, and

the (b) polyolefin-based resin is compounded with an olefin-based resin having an epoxy group and an ethylene⋅α-olefin-based copolymer at a ratio by weight of 45:55 to 50:50.

2. The pipe-shaped integrally molded article according to claim 1 , wherein a take-off breaking speed V (m/min) of the polyphenylene sulfide resin composition at a state being molten is 20 or more.

3. The pipe-shaped integrally molded article according to claim 1 , wherein, when a wall thickness of a straight cylinder section extending straightly in the pipe-shaped integrally molded article is referred to as A (mm), and a wall thickness of the different-shape section, the bent section or the different-diameter section is referred to as B (mm), a wall thickness change rate C, which is a rate of change of the wall thickness B to the wall thickness A, is within 15%.

4. The pipe-shaped integrally molded article according to claim 1 , wherein the flexural modulus of the polyphenylene sulfide resin compositions is 0.1 GPa or more and 4.5 GPa or less.

5. A method for producing a pipe-shaped integrally molded article wherein the pipe-shaped integrally molded article according to claim 1 is molded within a single melt solidification cycle.

6. The method for producing a pipe-shaped integrally molded article according to claim 5 , wherein
a mold having an opening at each of an upper end and a lower end is used,
a molten parison is supplied from the opening at the upper end of the mold, and
a blow molding is performed while the inside of the mold is sucked through the opening at the lower end of the mold.

Assignees

• Toray Industries

Inventors

• Suzuki Yuki
• Sato Rei
• Okubo Kazuya

Classifications

• B29C49/0006

  for heating or cooling · CPC title

• B29C49/04114 Primary

  for keeping constant thickness · CPC title

• B29C48/022 Primary

  characterised by the choice of material · CPC title

• B29K2081/04

  Polysulfides, e.g. PPS, i.e. polyphenylene sulfide or derivatives thereof · CPC title

• B29K2309/14

  Stones · CPC title