Polyamide resin composition for extrusion molded products exposed to high-pressure hydrogen, and extrusion molded product

A technology of polyamide resin and molded products, applied in the field of extrusion molded products, can solve problems such as damage, tank deformation, and increased accumulation, and achieve the effects of fast traction speed, small thickness unevenness, and excellent sag resistance

Active Publication Date: 2021-02-23
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the small molecular size of hydrogen, it is easier to permeate through the resin than natural gas with a large molecular size, and the amount of high-pressure hydrogen accumulated in the resin is larger than hydrogen at normal pressure. Such resin tanks have the problem of deformation and destruction of the tank if the filling and depressurization of high-pressure hydrogen are repeated.

Method used

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  • Polyamide resin composition for extrusion molded products exposed to high-pressure hydrogen, and extrusion molded product
  • Polyamide resin composition for extrusion molded products exposed to high-pressure hydrogen, and extrusion molded product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～4、 comparative example 4、5

[0120] Each raw material described in Tables 1 and 2 was supplied to a twin-screw extruder (TEX30α- 35BW-7V) (L / D = 45 (In addition, L here is the length from the raw material supply port to the discharge port, and D is the diameter of the screw.)) and melt-kneaded. The strips discharged from the die at a speed of 20kg / h were quenched by passing through a cooling bath filled with water at a temperature of 10°C for 10 seconds, and then pelletized with a strand pelletizer to obtain particles. The obtained granules were vacuum-dried at a temperature of 80° C. for 12 hours with a vacuum dryer to obtain dried granules. From the obtained pellets, extrude from a die at an extrusion temperature of 260°C using an extruder, pass through a shaping die, cool, and extrude into a tubular extruded product with an outer diameter of 100 mm and an inner diameter of 94 mm. . About thickness, average thickness x was calculated|required from Formula 1), and the result is described in Table 1,2....

Embodiment 1

[0121] In Example 1, kneading was carried out with a composition of 85 parts by weight of PA6 (ηr=4.4) as polyamide 6 resin (A), 15 parts by weight of impact-resistant material 2 and 0.1 part by weight of metal halide 1 . The resin temperature during melt-kneading was 265°C. The average dispersion diameter of the impact-resistant material 2 obtained was 0.13 μm, and the particles were finely dispersed. In addition, the melt tension of the obtained pellets was 70 mN, and the pulling speed at breakage was 150 m / min, which were favorable. The extruded product had no defects, and the standard deviation of the thickness of the extruded product was 0.046, which was favorable.

Embodiment 2

[0122] In Example 2, the impact-resistant material 2 of Example 1 was changed into the impact-resistant material 3, and it was the same as Example 1 except that. The resin temperature during melt-kneading was 272°C. The melt tension of the obtained pellets was 85 mN, and the pulling speed at breakage was good at 107 m / min. The extruded product had no defects, and the standard deviation of the thickness of the extruded product was 0.043, which was good.

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Abstract

The purpose of the present invention is to provide a polyamide resin composition which has excellent extrusion moldability and retention stability, can suppress the thickness deviation of a molded product, and can be used to obtain an extrusion molded product in which the occurrence of defects is suppressed even after repeated charging and release of high-pressure hydrogen. Provided is a polyamideresin composition for extrusion molded products exposed to high-pressure hydrogen, the polyamide resin composition being obtained by combining 0.005-1 part by weight of a metal halide (C) with 100 parts by weight in total of 70-99 parts by weight of a polyamide 6 resin (A) and 1-30 parts by weight of an impact resistant material (B), wherein the polyamide resin composition has a molten tension ofat least 20 mN as measured at 260 DEG C, and a take-up speed at break of at least 30m/min as measured at 260 DEG C.

Description

technical field [0001] The present invention relates to a polyamide 6 resin, an impact-resistant material, and a metal halide compounded in a specific amount, and controlled to a specific melt tension, pulling speed at break, and a polyamide used for extruded products in contact with high-pressure hydrogen. An amide resin composition and an extruded product obtained by molding it. Background technique [0002] In recent years, in order to respond to the depletion of petroleum fuels and the reduction of harmful gas emissions, fuel cells that electrochemically react hydrogen and oxygen in the air to generate electricity are mounted on automobiles, and the electricity generated by the fuel cells is supplied to the electric motor. Fuel cell electric vehicles as the driving force are attracting attention. As a high-pressure hydrogen tank for mounting a fuel cell electric vehicle, a resin tank in which the outer side of a resin liner is reinforced with a carbon fiber-reinforced r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/02B29C48/32B29C48/92C08K3/16C08L23/26F17C1/16
CPCB29C48/32B29C48/92C08L77/02C08G69/14B29C48/022B29C48/40B29C48/05B29C48/04B29C48/919B29C48/345B29C48/0022B29B9/06B29B9/12B29B9/16B29B7/726B29B7/42B29B7/48B29B7/007B29B7/90Y02E60/32C08K3/16C08L23/26B29C48/09F16C1/16Y02P90/45B29C48/0021B29K2077/00B29K2105/0005B29L2031/7156C08L77/06F17C1/16C08K3/014C08K13/02C08K3/105
Inventor 落合伸一郎铃木翔太小林定之
Owner TORAY IND INC
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