Polyamide Composite Resin for Fuel Filler Pipe Gas Barrier
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Solution Overview
Problem
Fuel filler pipes face challenges in achieving superior mechanical properties, low-temperature impact resistance, and gas barrier properties against gasoline and mixed fuels, particularly due to the limitations of conventional materials like HDPE and nylon-based resins.
Innovation Solution
A polyamide composite resin composition is developed, comprising 41-77% polyamide 6, 5-15% m-xylenediamine (MXD)-based modified nylon, 14-30% maleic anhydride-grafted ethylene-octene copolymer or thermoplastic elastic body rubber, and 3-10% mixed clay, which enhances blow-molding capabilities and gas barrier properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyamide 6 is used for fuel filler pipe, then gas barrier properties against gasoline are improved, but low-temperature impact properties deteriorate
Solution Approach 1:
The patent uses a composite material system consisting of polyamide 6 as the base resin, MXD-based modified nylon as a barrier enhancement additive (5-15 wt%), and thermoplastic elastomer as an impact modifier (10-30 wt%). This composite approach allows simultaneous improvement of gas barrier properties and low-temperature impact resistance by combining materials with complementary properties.
Solution Approach 2:
The patent modifies the chemical composition parameters of the polyamide 6 system by introducing MXD-based modified nylon which changes the molecular structure and intermolecular forces. This parameter change enhances the gas barrier properties while the thermoplastic elastomer component adjusts the impact resistance parameters at low temperatures.
2Ease of manufacture
If HDPE is used for blow molding, then ease of manufacture is improved, but gas barrier properties deteriorate
Solution Approach 1:
The patent creates a composite resin system that maintains the processability of HDPE-like materials while incorporating polyamide 6 and MXD-based modified nylon to provide superior gas barrier properties. The thermoplastic elastomer component ensures good melt flow and blow molding characteristics.
Solution Approach 2:
The patent applies local quality enhancement by concentrating the gas barrier function in the polyamide 6 and MXD-based modified nylon phases, while the thermoplastic elastomer phase provides processability. This functional differentiation allows each component to optimize its specific role.
3Reliability
If multilayered structure is formed with EVOH and HDPE to improve gas barrier properties, then gas barrier properties are improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent merges the gas barrier function and the structural matrix function into a single composite resin system. Instead of using separate EVOH and HDPE layers, the invention combines polyamide 6, MXD-based modified nylon, and thermoplastic elastomer into one homogeneous composite material that provides both barrier and processability functions simultaneously.
Solution Approach 2:
The composite resin system performs multiple functions within a single material: polyamide 6 provides the base structure and chemical resistance, MXD-based modified nylon enhances gas barrier properties, and thermoplastic elastomer ensures processability and impact resistance. This multi-functionality eliminates the need for complex multilayered structures.
Data Source
AI summary
A polyamide composite resin composition for a fuel filler pipe, the polyamide composite resin includes 41 to 77% by weight of polyamide 6, 5 to 15% by weight of m-xylenediamine (MXD)-based modified nylon, 14 to 30% by weight of a maleic anhydride-grafted ethylene-octene copolymer, a maleic anhydride-grafted ethylene-propylene-diene monomer or a thermoplastic elastic body rubber as a mixture thereof, and 3 to 10% by weight of mixed clay.