Multilayer Piping Structure for Fuel Barrier and Flexibility
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Solution Overview
Problem
Existing methods for water service piping require additional protective covers, which complicate operations and reduce productivity, and fail to provide adequate fuel barrier properties without such covers.
Innovation Solution
A multilayer structure comprising a polyolefin layer and a specific polyamide resin composition layer, which includes a diamine unit derived from xylylenediamine and a dicarboxylic acid unit from α,ω-linear aliphatic dicarboxylic acid, offering excellent flexibility and fuel barrier properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal laminate film protective cover is used to prevent fuel penetration, then fuel barrier properties are improved, but device complexity and operation difficulty increase due to the need for additional covering processes
Solution Approach 1:
The patent combines the water service piping and fuel barrier functions into a single integrated multilayer structure. The polyolefin layer provides flexibility and chemical resistance while the polyamide layer provides fuel barrier properties, eliminating the need for separate protective covers and simplifying the overall structure.
Solution Approach 2:
The patent uses a composite multilayer structure consisting of polyolefin and polyamide layers. This composite material approach allows the piping itself to provide both mechanical properties (flexibility, chemical resistance) and fuel barrier properties, resolving the contradiction between reliability and structural complexity.
2Reliability
If a metal laminate film protective cover is used to prevent fuel penetration, then fuel barrier properties are improved, but productivity decreases due to complicated processing operations
Solution Approach 1:
The patent merges the fuel barrier function directly into the water service piping through a multilayer structure. This integration eliminates the separate step of applying protective covers, thereby improving productivity while maintaining fuel barrier properties.
Solution Approach 2:
The multilayer piping structure serves multiple functions simultaneously: it acts as both the water service piping and the fuel barrier protection. This multi-functionality eliminates the need for additional protective cover processes, improving productivity without sacrificing fuel barrier reliability.
3Ease of operation
If polyethylene piping is used to ensure flexibility and chemical resistance, then ease of operation is improved, but fuel barrier properties deteriorate allowing fuel penetration into water
Solution Approach 1:
The patent applies local quality by using different materials for different functional requirements. The polyolefin layer provides flexibility and chemical resistance where needed, while the polyamide layer provides fuel barrier properties in the specific region where fuel penetration prevention is critical. Each layer performs its specialized function optimally.
Solution Approach 2:
The patent uses a composite multilayer structure where polyolefin and polyamide materials are combined. The polyolefin layer maintains the flexibility and chemical resistance of polyethylene piping, while the polyamide layer adds the necessary fuel barrier properties, thus resolving the contradiction between ease of operation and fuel barrier reliability.
Data Source
AI summary
A multilayer structure including a polyolefin layer (A) and a polyamide resin composition layer (B), wherein the polyamide resin composition constituting the layer (B) contains a polyamide resin (b-1) in which a diamine constituent unit thereof contains a constituent unit derived from a xylylenediamine and a dicarboxylic acid constituent unit thereof contains a constituent unit derived from an α,ω-linear aliphatic dicarboxylic acid having from 4 to 20 carbon atoms and a modified polyolefin (b-2), and the content of the modified polyolefin (b-2) is from 5 to 30 parts by mass relative to 100 parts by mass of the polyamide resin (b-1).