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Polyamide resin composition for blow-molded articles in contact with high-pressure hydrogen, and blow-molded article using polyamide resin composition

A polyamide resin and blow molding technology, applied in the field of blow molding products, can solve problems such as damage, increased accumulation, and tank deformation, and achieve the effects of not being easily broken, suppressing local enlargement, and excellent blow molding properties

Active Publication Date: 2021-02-26
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 blow-molded articles in contact with high-pressure hydrogen, and blow-molded article using polyamide resin composition
  • Polyamide resin composition for blow-molded articles in contact with high-pressure hydrogen, and blow-molded article using polyamide resin composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～4、 comparative example 5、6

[0119] 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 mold at a speed of 20 kg / h were quenched by passing through a cooling bath filled with water whose temperature was adjusted to 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, a parison was extruded using a blow molding machine at a cylinder temperature of 260° C., a die diameter of φ80 mm, and a core diameter of φ50 mm. Then, the mold set at 80° C. was closed and air was blown in. A blow molded product having a length of 500 mm and a diameter of φ300 mm was obtained. Using the obtained blow ...

Embodiment 1

[0120] In Example 1, kneading was performed 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 blow molded product also had no defects, and the standard deviation of residual strain was 0.45, which was good.

Embodiment 2

[0121] 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 blow molded product also had no defects, and the standard deviation of residual strain was 0.41, which was good.

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Abstract

The purpose of the present invention is to provide a polyamide resin composition which has excellent blow moldability and retention stability, can suppress the residual strain of a molded product fromlocally increasing, and can be used to obtain a blow-molded product in which the occurrence of defects is suppressed even after repeated charging and release of high-pressure hydrogen. Provided is the polyamide resin composition for blow-molded products exposed to high-pressure hydrogen, the polyamide resin composition is characterized 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 of at least 20 mN as measured at 260 DEG C, and a take-up speed at break of at least 50 m / 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 blow moldings in contact with high-pressure hydrogen. An amide resin composition and a blow molded article 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 res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/02B29C49/04C08K3/16C08L23/26
CPCC08L77/02C08G69/14B29L2031/7156B29K2077/00B29C49/0005Y02E60/32C08K3/16C08L23/26B29C49/04C08K5/09B29K2995/0089C08F222/06C08L2203/30F17C1/16F17C2203/0604F17C2203/066F17C2209/2127F17C2221/012
Inventor 落合伸一郎铃木翔太小林定之
Owner TORAY IND INC
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