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 in blow molding processes.
Innovation Solution
A polyamide composite resin composition comprising 41-77% polyamide 6, 5-15% m-xylenediamine (MXD)-based modified nylon, 14-30% maleic anhydride-grafted ethylene-octene copolymer, and 3-10% immobilization-pretreated mixed clay, along with additional components for enhanced heat stability and blow moldability, is developed to improve mechanical properties and gas barrier performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyamide 6 is used for fuel filler pipe, then gas barrier properties are improved, but low-temperature impact properties deteriorate
Solution Approach 1:
The invention uses a composite material system consisting of polyamide 6 as the base resin, MXD-6 modified nylon as a barrier enhancement component, and maleic anhydride-grafted ethylene-octene copolymer as an impact modifier. This composite structure allows the material to simultaneously achieve superior gas barrier properties from the polyamide 6 and MXD-6, while the elastomeric copolymer provides low-temperature impact resistance by absorbing impact energy through its rubbery phase.
2Reliability
If multilayered structure with HDPE and EVOH is used, then gas barrier properties are improved, but manufacturing complexity increases
Solution Approach 1:
The invention merges multiple functions into a single homogeneous resin composition rather than using a multilayered structure. The gas barrier function is achieved through the polyamide 6 and MXD-6 components, while impact resistance is provided by the maleic anhydride-grafted ethylene-octene copolymer dispersed within the matrix. This single-layer composite eliminates the need for multiple extruders and complex blow extrusion design required for multilayered HDPE/EVOH structures.
Solution Approach 2:
Instead of physically layering different materials, the invention creates a composite material where polyamide 6, MXD-6 modified nylon, and maleic anhydride-grafted ethylene-octene copolymer are combined in a single matrix. The MXD-6 modified nylon provides enhanced gas barrier properties through its molecular structure, while the elastomeric copolymer provides impact modification, achieving multilayered functionality in a single homogeneous material system.
3Strength
If inorganic fillers are added to improve mechanical properties, then tensile strength is improved, but elongation properties deteriorate
Solution Approach 1:
The invention changes the chemical composition parameters by incorporating maleic anhydride-grafted ethylene-octene copolymer, which contains reactive maleic anhydride groups that can form strong interfacial bonds with polyamide 6. This chemical modification allows the elastomeric copolymer to effectively transfer stress and improve tensile strength while maintaining its ability to elongate and absorb energy, thus improving both tensile strength and elongation properties simultaneously.
Data Source
AI summary
A polyamide composite resin composition for a fuel filler pipe 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 mixture thereof, and 3 to 10% by weight of mixed clay.