Ethylene Tetrafluoroethylene Copolymer Chlorine Control Adhesion
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Solution Overview
Problem
Existing ethylene/tetrafluoroethylene copolymers face challenges in achieving both excellent adhesion to metal substrates and maintaining heat resistance, with previous methods either compromising adhesion or impairing heat resistance due to the presence of chlorine atoms.
Innovation Solution
An ethylene/tetrafluoroethylene copolymer with chlorine atoms covalently bonded to carbon atoms in a controlled range (100-500 mass ppm), specifically introduced using a chain transfer agent like 1,3-dichloro-1,1,2,2,3-pentafluoropropane, to enhance adhesion while minimizing heat resistance degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If chlorine atoms are introduced into the copolymer to improve adhesion to metal substrates, then adhesion is improved, but heat resistance is impaired
Solution Approach 1:
The invention changes the parameter of chlorine content from binary (present/absent) to a controlled range (100-500 mass ppm). This quantitative control allows optimization of adhesion properties while preventing excessive chlorine from degrading heat resistance through molecular weight reduction.
Solution Approach 2:
The invention applies local quality by introducing chlorine atoms only at specific locations (terminal groups of polymer chains) rather than uniformly throughout the polymer structure. This localized introduction improves adhesion at the substrate interface while minimizing bulk polymer degradation.
2Strength
If a primer layer is formed to improve adhesion between fluororesin and metal substrate, then adhesion durability is improved, but coating structure complexity increases
Solution Approach 1:
The invention extracts the adhesion-enhancing function from a separate primer layer and integrates it directly into the ETFE copolymer structure through controlled chlorine introduction. This eliminates the need for a distinct primer layer while maintaining adhesion durability.
Solution Approach 2:
The modified ETFE copolymer achieves multi-functionality by simultaneously providing the base coating properties and adhesion enhancement functions that previously required separate primer and topcoat layers. The single-layer coating performs multiple functions.
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 copolymer achieves excellent adhesion to metal substrates and maintains superior heat resistance, as the controlled chlorine content prevents molecular weight reduction and heat resistance impairment, resulting in a coating film with enhanced mechanical and chemical properties.
Implementation Method 1
the content of chlorine atoms covalently bonded to any carbon atoms in the copolymer is from 100 to 500 mass ppm
Implementation Method 2
a monomer component comprising ethylene and tetrafluoroethylene is subjected to a polymerization reaction by using a chain transfer agent having a chlorine atom
Data Source
AI summary
To provide a powder coating material to form a coating film excellent in adhesion to a metal substrate and excellent in heat resistance, and an ethylene/tetrafluoroethylene copolymer contained therein. An ethylene/tetrafluoroethylene copolymer in which the content of chlorine atoms covalently bonded to any carbon atoms in the copolymer is from 100 to 500 mass ppm. A method for producing the ethylene/tetrafluoroethylene copolymer in which all or some of the chlorine atoms are introduced by using a chain transfer agent having a chlorine atom. A powder coating material comprising the ethylene/tetrafluoroethylene copolymer. A molded article having a coating film formed by the powder coating material, on a surface of a metal substrate.