Hydrogen Tank Body Base Layer Moldability and Dimensional Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Hydrogen tank bodies made from polyamide resin compositions exhibit variations in dimensions during molding due to processing characteristics, necessitating a technology to reduce or prevent these variations.
Innovation Solution
A hydrogen tank body is constructed using a base layer of synthetic resins like silicon resin or polyphenylene sulfide, which are more easily molded, and a hydrogen impermeable liner layer, with the base layer serving as a mold form for blow molding to minimize dimensional variations, and a pressure-resistant layer is applied directly without a mold release agent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyamide resin composition is used for hydrogen tank body, then hydrogen impermeability is improved, but dimensional variations during molding increase
Solution Approach 1:
The hydrogen tank body is divided into two distinct layers: a base layer made of synthetic resin with good moldability (such as polypropylene, polyethylene, or polycarbonate) that ensures dimensional accuracy, and a liner layer made of hydrogen impermeable resin (such as polyamide 6) that ensures hydrogen barrier performance. This segmentation allows each layer to optimize its specific function without compromising the other.
Solution Approach 2:
The invention uses a composite structure combining two different resin materials with complementary properties. The base layer uses synthetic resin selected from specific groups (polyolefins, polycarbonate, etc.) that provide excellent moldability and dimensional stability, while the liner layer uses hydrogen impermeable resin that provides the required hydrogen barrier. This composite approach resolves the contradiction between manufacturability and reliability.
2Ease of manufacture
If mold release agent is applied to the hydrogen tank body, then ease of manufacture is improved, but production time increases due to drying requirement
Solution Approach 1:
The base layer made of synthetic resin (polypropylene, polyethylene, polycarbonate, etc.) inherently possesses good mold releasability and release properties, eliminating the need for external mold release agents. This self-service characteristic allows the hydrogen tank body to be easily removed from the mold without requiring additional coating or drying steps, thus reducing production time while maintaining ease of manufacture.
3Manufacturing precision
If base layer is formed first using synthetic resin, then dimensional variations are reduced, but production process complexity increases
Solution Approach 1:
The invention merges the formation of the base layer and liner layer into a single integrated molding process. The base layer made of synthetic resin is formed first to establish precise dimensions, then the liner layer of hydrogen impermeable resin is formed directly over it in sequence. This combined approach maintains manufacturing precision while avoiding the need for separate production and assembly steps, thus not increasing overall process complexity.
Data Source
AI summary
A hydrogen tank body includes a base layer formed of a synthetic resin selected from the group consisting of silicon resin, polyphenylene sulfide, polybutylene terephthalate, polyvinyl chloride, polypropylene, polyethylene, and polycarbonate, and a liner layer formed of hydrogen impermeable resin, on an inside wall surface of the base layer.