Fluorinated Laminate Crosslinking for Alkali Resistance
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Solution Overview
Problem
Conventional rubber laminates, particularly those involving fluororubbers, face challenges with alkali resistance and interlaminar strength at high temperatures, leading to peeling issues in applications like fuel hoses for automobiles.
Innovation Solution
A laminate production process involving a fluorinated elastic polymer and a non-fluorinated elastic polymer, where the crosslinking rates are carefully managed to ensure a narrow difference, and the inclusion of crosslinking aids and antioxidants, resulting in a laminate with enhanced alkali resistance and interlaminar strength at high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluororubber (FEPM or FFKM) is laminated with non-fluororubber to improve alkali resistance, then alkali resistance is improved, but adhesion between layers decreases and peeling occurs at high temperature
Solution Approach 1:
The patent changes the chemical composition parameters of the rubber compositions by introducing specific compounds: a carboxylic acid and its anhydride in the fluororubber composition, and a polyol in the non-fluororubber composition. These compositional changes enable chemical crosslinking at the interface between layers, resolving the adhesion problem while maintaining alkali resistance.
Solution Approach 2:
The patent creates a composite laminate structure where fluororubber and non-fluororubber layers are chemically bonded through crosslinking. The use of carboxylic acid/anhydride groups combined with polyol groups forms a crosslinked composite material that maintains the alkali resistance of fluororubber while achieving strong interlaminar adhesion.
2Ease of operation
If conventional rubber laminate is used for fuel hoses, then basic rubber properties are maintained, but alkali resistance is insufficient in strongly alkaline environments
Solution Approach 1:
The patent modifies the chemical composition of the rubber laminate by incorporating carboxylic acid/anhydride groups and polyol groups, which enable crosslinking. This compositional change enhances alkali resistance while preserving the fundamental rubber properties needed for fuel hose application.
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 process produces a laminate with improved alkali resistance and interlaminar strength, preventing peeling at high temperatures, making it suitable for severe environments such as automotive fuel hoses.
Implementation Method 1
crosslinking the first composition and the second composition to produce a laminate having a first layer formed of a crosslinked product of the first composition and a second layer formed of a crosslinked product of the second composition
Implementation Method 2
the inclusion of crosslinking aids and antioxidants, resulting in a laminate with enhanced alkali resistance and interlaminar strength at high temperatures
Data Source
AI summary
To provide a laminate excellent in alkali resistance and interlaminar strength at high temperature, and a process for producing the laminate. A process for producing a laminate, comprising producing a non-crosslinked laminate having a layer of a first composition containing a copolymer having fluorine atoms and a layer of a second composition containing a non-fluorinated elastic polymer, and crosslinking the first composition and the second composition to produce a laminate having a first layer formed of a crosslinked product of the first composition and a second layer formed of a crosslinked product of the second composition, wherein when the first composition and the second composition contains a common crosslinking aid, the absolute value of the crosslinking rate difference between the first composition and the second composition is at most 0.30.