Fluororesin Composition Balancing Fuel Barrier and Elastomer Adhesion
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Solution Overview
Problem
Conventional thermoplastic resin compositions fail to achieve optimal barrier properties against fuel and adhesiveness to elastomer layers simultaneously.
Innovation Solution
A thermoplastic resin composition comprising a fluororesin with a chlorotrifluoroethylene and tetrafluoroethylene unit, combined with a crosslinked fluoroelastomer treated with a polyamine compound and crosslinking accelerator, resulting in enhanced barrier properties and adhesiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fluororesin composition is designed to achieve barrier properties against fuel, then fuel resistance improves, but adhesiveness to elastomer layers deteriorates
Solution Approach 1:
The patent uses a composite material system consisting of fluororesin (A) with specific functional groups and crosslinked fluoroelastomer (B) obtained through dynamic crosslinking treatment. This composite structure combines the fuel barrier properties of fluororesin with the adhesiveness and flexibility of crosslinked fluoroelastomer, achieving both high fuel resistance and strong adhesiveness simultaneously.
Solution Approach 2:
The patent changes the chemical parameters of the fluororesin by selecting specific functional groups (carboxyl, hydroxyl, or amino groups) at the polymer chain terminals. These parameter changes enable the fluororesin to maintain both its fuel barrier properties and its ability to bond with elastomer layers through the dynamic crosslinking process.
2Ease of operation
If conventional crosslinking treatment is applied to fluoroelastomer, then flexibility improves, but fuel barrier properties deteriorate
Solution Approach 1:
The patent applies local quality by performing dynamic crosslinking treatment only on the fluoroelastomer phase while maintaining the fluororesin phase with its inherent fuel barrier properties. The crosslinked fluoroelastomer provides flexibility and adhesiveness locally, while the fluororesin matrix maintains the overall fuel barrier performance of the composition.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The composition exhibits improved fuel barrier properties and adhesiveness to elastomer layers, with specific infrared absorption peak ratios and a low fuel permeability coefficient, while maintaining flexibility and heat resistance.
Implementation Method 1
the crosslinked fluoroelastomer (B) is obtained by subjecting a fluoroelastomer (b) to a dynamic crosslinking treatment along with 0.5-15 pbm per 100 pbm of the fluoroelastomer (b) of a polyamine compound (c) having a thermal decomposition temperature of 210°C or higher and a crosslinking accelerator (d) in the presence of the fluororesin (A) under conditions for melting the fluororesin (A)
Implementation Method 2
a thermoplastic resin composition that has further excellent barrier properties against fuel and adhesiveness to an elastomer layer compared to the conventional technology
Implementation Method 3
the fluororesin (A) is a copolymer that contains a chlorotrifluoroethylene unit and a tetrafluoroethylene unit and that has at least one functional group selected from the group consisting of a carbonyl group, an olefinic group and an amino group at a main chain terminal or side chain terminal of the polymer
Data Source
AI summary
The present invention provides a thermoplastic resin composition comprising a fluororesin (A) and a crosslinked fluoroelastomer (B), wherein the fluororesin (A) is a copolymer that contains a chlorotrifluoroethylene unit and a tetrafluoroethylene unit and that has at least one functional group selected from the group consisting of a carbonyl group, an olefinic group and an amino group at a main chain terminal or side chain terminal of the polymer, and wherein the crosslinked fluoroelastomer (B) is obtained by subjecting a fluoroelastomer (b) to a dynamic crosslinking treatment along with a polyamine compound (c) having a thermal decomposition temperature of 210°C or higher and a crosslinking accelerator (d) in the presence of the fluororesin (A) under conditions for melting the fluororesin (A).