阅读说明：本技术 一种ⅳ型氢气瓶热塑型内胆及其制作方法 (Thermoplastic inner container of IV-type hydrogen cylinder and manufacturing method thereof ) 是由 刘烈新 于 2021-09-07 设计创作，主要内容包括：本发明涉及复合材料技术领域,特别是一种Ⅳ型氢气瓶热塑型内胆及其制作方法,与现有技术相比,该一种Ⅳ型氢气瓶热塑型内胆采用三层结构,内层为由95-80％的改性尼龙一和5-20％的尼龙弹性体所组成的混合体,中间层为EVOH和粘合树脂,外层为改性尼龙二；所述的改性尼龙一由石墨烯、共聚尼龙、热稳定剂、相容剂一进行改性造粒而成；所述的改性尼龙二由乙烯-醋酸乙烯共聚物、尼龙6、润滑剂、相容剂二进行改性造粒而成,采用三层结构进行共挤出可以有效构阻隔氢气泄漏,提高了耐氢气的渗透性,尼龙改性一是石墨烯与尼龙的结合可以提高整体的耐热性,通过改性尼龙二以及尼龙弹性体可提高整体韧性,包括低温灌装氢气时的韧性。(The invention relates to the technical field of composite materials, in particular to a thermoplastic inner container of an IV-type hydrogen cylinder and a manufacturing method thereof, compared with the prior art, the thermoplastic inner container of the IV-type hydrogen cylinder adopts a three-layer structure, the inner layer is a mixture consisting of 95-80% of modified nylon I and 5-20% of nylon elastomer, the middle layer is EVOH and adhesive resin, and the outer layer is modified nylon II; the modified nylon I is prepared by modifying and granulating graphene, copolymerized nylon, a heat stabilizer and a compatilizer I; the modified nylon II is formed by modifying and granulating ethylene-vinyl acetate copolymer, nylon 6, a lubricant and a compatilizer II, a three-layer structure is adopted for coextrusion, hydrogen leakage can be effectively blocked, the hydrogen-resistant permeability is improved, the nylon modification is that the combination of graphene and nylon can improve the overall heat resistance, and the overall toughness can be improved through the modified nylon II and a nylon elastomer, including the toughness during low-temperature hydrogen filling.)

1. A type IV hydrogen cylinder thermoplastic inner bag which is characterized in that: the composite material is of a three-layer structure, wherein the inner layer is a mixture consisting of 95-80% of modified nylon I and 5-20% of nylon elastomer, the middle layer is EVOH and adhesive resin, and the outer layer is modified nylon II; the modified nylon I is prepared by modifying and granulating graphene, copolymerized nylon, a heat stabilizer and a compatilizer I; the modified nylon II is prepared by modifying and granulating ethylene-vinyl acetate copolymer, nylon (6), lubricant and compatilizer II.

2. The thermoplastic liner of a type iv hydrogen cylinder according to claim 1, wherein: the inner layer is formed by heating and extruding modified nylon I and nylon elastomer.

3. The thermoplastic liner of a type iv hydrogen cylinder according to claim 1, wherein: the heat stabilizer is compounded by an antioxidant and an organic copper salt.

4. The thermoplastic liner of a type iv hydrogen cylinder according to claim 1, wherein: the compatilizer I is maleic anhydride grafted ethylene propylene diene monomer (EPDM-gMAH); the second compatilizer is anhydride grafted ethylene-vinyl acetate copolymer (EVA-g-MAH).

5. A manufacturing method of a thermoplastic inner container of a type IV hydrogen cylinder is characterized in that: the outer layer, the inner layer and the middle layer are manufactured by adopting a multi-layer co-extrusion technology or an extrusion injection molding mode.

Technical Field

The invention relates to the technical field of composite materials, in particular to a thermoplastic inner container of an IV-type hydrogen cylinder and a manufacturing method thereof.

Background

The liner of the IV-type hydrogen cylinder in the prior art is made of common nylon materials, has poor heat resistance and toughness, and is easy to break to cause air leakage and the like in use.

Disclosure of Invention

In order to solve the defects and problems of the inner container of the hydrogen cylinder in the prior art, a thermoplastic inner container of an IV-type hydrogen cylinder and a manufacturing method thereof are provided.

The technical scheme adopted by the invention for solving the technical problem is as follows: the thermoplastic liner of the IV-type hydrogen cylinder adopts a three-layer structure, the inner layer is a mixture consisting of 95-80% of modified nylon I and 5-20% of nylon elastomer, the middle layer is EVOH and adhesive resin, and the outer layer is modified nylon II; the modified nylon I is prepared by modifying and granulating graphene, copolymerized nylon, a heat stabilizer and a compatilizer I; the modified nylon II is prepared by modifying and granulating ethylene-vinyl acetate copolymer, nylon (6), lubricant and compatilizer II.

The inner layer is formed by heating and extruding modified nylon I and nylon elastomer.

The heat stabilizer is compounded by an antioxidant and an organic copper salt.

The compatilizer I is maleic anhydride grafted ethylene propylene diene monomer (EPDM-gMAH); the second compatilizer is anhydride grafted ethylene-vinyl acetate copolymer (EVA-g-MAH).

A manufacturing method of a thermoplastic inner container of a type IV hydrogen cylinder is characterized in that: the outer layer, the inner layer and the middle layer are manufactured by adopting a multi-layer co-extrusion technology or an extrusion injection molding mode.

The invention has the beneficial effects that: compared with the prior art, the thermoplastic liner of the IV-type hydrogen cylinder has the advantages that the thermoplastic liner of the IV-type hydrogen cylinder is extruded by adopting a three-layer structure, hydrogen leakage can be effectively prevented, the hydrogen-resistant permeability is improved, the overall heat resistance can be improved by combining graphene and nylon through nylon modification, the overall toughness can be improved by modifying nylon and nylon elastomer, and the toughness comprises the toughness during low-temperature hydrogen filling.

The specific implementation mode is as follows:

the thermoplastic inner container of the IV-type hydrogen cylinder adopts a three-layer structure, the inner layer is formed by heating and extruding modified nylon I and nylon elastomer, the middle layer is EVOH (ethylene/vinyl alcohol copolymer) and adhesive resin, and the outer layer is modified nylon II. Wherein the first modified nylon accounts for 95-80% of the total mass, and the nylon elastomer accounts for 5-20% of the total mass. The modified nylon I is prepared by modifying and granulating graphene, copolymerized nylon, a heat stabilizer and a compatilizer I. Wherein the heat stabilizer is compounded by an antioxidant and organic copper salt, and the compatilizer I is maleic anhydride grafted ethylene propylene diene monomer (EPDM-gMAH).

The modified nylon II is prepared by modifying and granulating ethylene-vinyl acetate copolymer (EVA), nylon 6, lubricant and compatilizer II. Wherein the compatilizer II is anhydride grafted ethylene-vinyl acetate copolymer (EVA-g-MAH).

The thermoplastic inner container of the IV-type hydrogen cylinder is prepared by adopting a multilayer co-extrusion technology or an extrusion injection molding mode for the outer layer, the inner layer and the middle layer.

In conclusion, compared with the prior art, the thermoplastic liner of the IV-type hydrogen cylinder has the advantages that the thermoplastic liner of the IV-type hydrogen cylinder is extruded by adopting a three-layer structure, hydrogen leakage can be effectively blocked, the permeability of hydrogen resistance is improved, the overall heat resistance can be improved by combining graphene and nylon through nylon modification, and the overall toughness can be improved by modifying nylon and nylon elastomer, including the toughness during low-temperature hydrogen filling.

The present invention has been described in accordance with embodiments thereof with the understanding that the present invention is not limited thereto but rather it is to be understood that variations and/or modifications may be made by those skilled in the art without departing from the scope of the invention as defined by the appended claims, and any such modifications, equivalents and the like as fall within the true spirit and scope of the invention.