Aqueous Coating Agent Adhesion and Stability via pH Control
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Solution Overview
Problem
Existing aqueous coating agents fail to provide adequate adhesiveness, warm water resistance, corrosion resistance, and chemical resistance for substrates, particularly plastic and metal surfaces, and often compromise storage stability and compounding stability when using emulsifiers.
Innovation Solution
An aqueous coating agent comprising a vinyl polymer with a basic nitrogen atom-containing group and a carboxylic group, combined with a quaternary ammonium salt, which improves adhesiveness, warm water resistance, corrosion resistance, and chemical resistance, while maintaining storage stability and compounding stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If an emulsifier is used to improve storage stability and compounding stability, then storage stability is improved, but adhesiveness, warm water resistance, corrosion resistance, and chemical resistance are deteriorated
Solution Approach 1:
The patent removes emulsifiers from the aqueous coating agent composition entirely. Instead of using emulsifiers to achieve storage stability, the invention relies on the intrinsic properties of the water-soluble polymer and appropriate pH control to maintain stability without compromising film performance properties such as adhesiveness and chemical resistance.
Solution Approach 2:
The patent controls the pH of the aqueous coating agent within a specific range (pH 2-7) to achieve both storage stability and good film properties without emulsifiers. By adjusting pH parameters, the formulation achieves stability through electrostatic repulsion between charged polymer chains rather than through emulsifier molecules.
2Reliability
If a coating agent is designed to provide excellent adhesiveness and chemical resistance, then film performance is improved, but storage stability and compounding stability are compromised
Solution Approach 1:
The patent achieves both good adhesiveness and storage stability by controlling the pH within a specific range (pH 2-7) and selecting appropriate water-soluble polymers with suitable molecular weights and charge densities. This parameter optimization allows the polymer to maintain both film-forming capability and colloidal stability without requiring emulsifiers.
3Object-affected harmful factors
If an aqueous coating agent uses conventional polymer dispersions, then environmental friendliness is improved, but warm water resistance and corrosion resistance are insufficient
Solution Approach 1:
The patent uses composite polymer systems comprising water-soluble polymers with specific functional groups (carboxyl, hydroxyl, amino groups) combined with appropriate crosslinking agents. This composite approach enables the formation of networks with enhanced warm water resistance and corrosion resistance while maintaining the environmental benefits of aqueous formulations.
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 coating agent forms a film with excellent adhesiveness and resistance to warm water, corrosion, and chemicals, effectively protecting various substrates, including plastics and metals, while maintaining stability over time.
Implementation Method 1
an aqueous coating agent comprising a vinyl polymer (A) having a basic nitrogen atom-containing group and a carboxylic group, and a quaternary ammonium salt (B)
Data Source
AI summary
The present invention provides an aqueous coating agent including a vinyl polymer (A) having a basic nitrogen atom-containing group and a carboxylic group, a quaternary ammonium salt (B), and an aqueous medium (C). Particularly, the present invention provides an aqueous coating agent including a compound represented by General Formula (1) below as the quaternary ammonium salt (B). The aqueous coating agent has excellent adhesiveness, warm water resistance, corrosion resistance, and chemical resistance, and can form a film that is capable of preventing the deterioration of various substrates. In General Formula (1), R1 to R4 each independently represent an alkyl group having 1 to 20 carbon atoms or an aryl group.