ETFE Primer Composition Adhesion and Stability
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Solution Overview
Problem
Existing liquid primer compositions for ETFE coatings do not provide sufficient adhesion properties to substrates, and the use of epoxy resin with a curing agent results in premature gelation, making them unsuitable as a liquid primer.
Innovation Solution
A liquid primer composition comprising reactive ethylene/tetrafluoroethylene copolymer powder with acid anhydride residues and epoxy resin, combined in specific ratios, which are heat-treated to form a primer layer, enhancing adhesion and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If epoxy resin powder is mixed with a liquid primer composition containing a curing agent, then adhesion properties are improved, but the composition gels prematurely and becomes unusable
Solution Approach 1:
The patent extracts the curing agent from the liquid primer composition, removing the source of premature gelation. The epoxy resin is applied as a powder component without the curing agent present in the liquid medium, allowing the composition to remain stable during storage while still enabling adhesion improvement when cured.
Solution Approach 2:
The epoxy resin powder is prepared and positioned in the composition beforehand, but the curing reaction is postponed until the appropriate time. The curing agent is applied separately or added only when needed, allowing the system to be prepared in advance without initiating the gelation process prematurely.
2Strength
If reactive groups are introduced into ETFE molecules to improve adhesion, then adhesion properties are enhanced, but the complexity of the polymer structure increases
Solution Approach 1:
The patent creates a composite system combining ETFE resin with epoxy resin powder. Rather than modifying the ETFE structure itself, the adhesion improvement is achieved through the composite interaction between ETFE and epoxy resin, which forms strong bonds with both the substrate and the ETFE coating layer.
Solution Approach 2:
The adhesion function is segmented into two separate components: the ETFE resin provides the coating matrix and basic adhesion, while the epoxy resin powder provides enhanced adhesion through its reactive groups. This segmentation allows each component to perform its specific function without requiring complex modifications to the ETFE structure.
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 solution provides excellent adhesion properties to both the substrate and top coating layers, with improved storage stability and uniform coating, while preventing premature gelation of the primer.
Implementation Method 1
a liquid primer composition comprising a powder (X) made of a reactive ethylene/tetrafluoroethylene copolymer containing repeating units (A) based on tetrafluoroethylene, repeating units (B) based on ethylene, and repeating units (C) based on a monomer having an acid anhydride residue and a polymerizable unsaturated bond
Implementation Method 2
a primer layer being a heat-treated product of the above composition
Data Source
AI summary
To provide a liquid primer composition excellent in adhesion properties and a laminate using the same. The liquid primer composition comprises a powder (X) made of a reactive ethylene/tetrafluoroethylene copolymer containing repeating units (A) based on tetrafluoroethylene, repeating units (B) based on ethylene, and repeating units (C) based on a monomer having an acid anhydride residue and a polymerizable unsaturated bond, in a content ratio of (C)/((A) + (B)) being from 1/10,000 to 5/100 by molar ratio; a powder (Y) made of an epoxy resin; and water (Z); wherein the content of the powder (Y) made of an epoxy resin is from 1 to 30 parts by mass per 100 parts by mass of the powder (X) made of a reactive ethylene/tetrafluoroethylene copolymer.