Aqueous Coating Composition Adjuvant Resin Humidity Tolerance
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Solution Overview
Problem
Waterborne coating compositions used in automotive applications often form rough, defect-prone films due to humidity variations, leading to pinholing issues that affect the physical properties of the coating.
Innovation Solution
An aqueous coating composition comprising water, film-forming polymers with functional groups, curing agents, and an adjuvant resin with a hydrocarbon chain and specific functional equivalent weight, which helps in forming a smooth, defect-free film under varying humidity conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If waterborne coating compositions are used to reduce atmospheric pollution, then environmental friendliness is improved, but film quality deteriorates due to pinholing and roughness under varying humidity conditions
Solution Approach 1:
The patent modifies the chemical composition parameters of the waterborne coating by incorporating specific adjuvant resins with defined molecular weights (1,000-10,000) and functional group densities. These parameter changes enable the coating to maintain film integrity and reduce pinholing across a broader humidity range, thus improving manufacturing precision while preserving environmental benefits
Solution Approach 2:
The patent creates a composite coating system by combining waterborne polymers with adjuvant resins containing specific functional groups (hydroxyl, carboxyl, or amine groups). This composite formulation synergistically improves film formation and defect reduction while maintaining the waterborne composition's environmental advantages, resolving the contradiction between eco-friendliness and film quality
2Manufacturing precision
If humidity control is implemented to prevent pinholing and roughness, then film quality is improved, but manufacturing cost increases considerably
Solution Approach 1:
The patent enables the coating composition to self-regulate its film formation process through the incorporated adjuvant resins, which inherently provide humidity tolerance. The functional groups in the adjuvant resin automatically adjust to varying humidity conditions during application and drying, eliminating the need for expensive controlled humidity environments while maintaining high film quality
Solution Approach 2:
By changing the chemical parameters of the coating formulation (adding adjuvant resin with specific molecular weight and functional group content), the patent shifts the system's sensitivity to humidity parameters. This allows the coating to perform well across wider humidity ranges, reducing or eliminating the need for costly humidity control infrastructure
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 achieves a smooth, defect-free film formation across a range of humidity levels, enhancing the physical properties of the coating and improving adhesion and chip resistance.
Implementation Method 1
an adjuvant resin having two or more terminal functional groups reactive with the functional groups of the curing agent
Implementation Method 2
a film-forming polymer containing functional groups, curing agents for the film-forming polymer having functional groups that are reactive with the functional groups of the film-forming polymer
Data Source
AI summary
An aqueous coating composition containing a colorant, a film-forming polymer and a curing agent. The composition further comprises an adjuvant resin having two or more functional groups reactive with the curing agent and positioned between the functional groups a moiety containing at least 10 contiguous carbon atoms.