Aqueous Coating Agent Composition Suppressing Resin-Surfactant Interaction
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Solution Overview
Problem
Conventional aqueous coating agents face issues with thickening and gelling due to interactions between curable resin and surfactants, leading to impaired fluidity and stability, which affects the uniformity and adhesion of the coating film, and without surfactants, solid particles precipitate, causing preservation stability problems and preventing desired coating functions.
Innovation Solution
An aqueous coating agent composition containing a curable resin in emulsion form, an anionic surfactant, solid particles, and a nitrogen-containing heterocyclic compound like 1,3-dimethyl-2-imidazolidinone, which suppresses interaction between the resin and surfactant, maintaining fluidity and stability, and using a solid lubricant for high adhesion and sliding properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a surfactant is added to disperse solid particles, then dispersion uniformity is improved, but interaction with curable resin causes thickening and gelling
Solution Approach 1:
The patent introduces a specific surfactant (sodium dodecylbenzenesulfonate) as an intermediary substance that mediates between solid particles and curable resin. This surfactant enables uniform dispersion of solid particles while suppressing harmful interactions with curable resin that cause thickening and gelling, thus resolving the contradiction between dispersion uniformity and composition stability.
Solution Approach 2:
The patent optimizes the concentration parameters of both the surfactant and curable resin to achieve the desired balance. By controlling the surfactant concentration at 0.1-10 wt% and curable resin concentration at 10-50 wt%, the patent prevents excessive interaction while maintaining adequate dispersion, thereby resolving the contradiction between dispersion uniformity and prevention of thickening/gelling.
2Stability of the object's composition
If surfactant concentration is increased to improve dispersion, then dispersion uniformity is improved, but fluidity and coatability deteriorate
Solution Approach 1:
The patent precisely controls the surfactant concentration parameter within 0.1-10 wt% to achieve optimal dispersion uniformity while maintaining adequate fluidity and coatability. This parameter optimization resolves the contradiction between improving dispersion and preserving operational ease.
3Stability of the object's composition
If solid particles are dispersed using surfactant, then dispersion stability is improved, but preservation stability deteriorates due to thickening
Solution Approach 1:
The patent uses sodium dodecylbenzenesulfonate as a mediator surfactant that provides long-term dispersion stability without causing the thickening and gelling that would compromise preservation stability. This mediator enables the composition to maintain both dispersion stability and preservation stability over extended periods.
Solution Approach 2:
The patent optimizes the ratio and concentration parameters of surfactant to curable resin to prevent thickening while maintaining dispersion stability. By controlling these parameters within specific ranges, the patent achieves both short-term dispersion stability and long-term preservation stability.
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 improved coatability, storage stability, and uniform coating films with excellent adhesion and sliding durability, maintaining lubricating properties over time, while being environmentally friendly and compliant with European regulations.
Implementation Method 1
a nitrogen-containing heterocyclic compound like 1,3-dimethyl-2-imidazolidinone, which suppresses interaction between the resin and surfactant, maintaining fluidity and stability
Implementation Method 2
a surfactant for uniformly dispersing solid particles in water
Implementation Method 3
a curable resin in emulsion form... coated and cured on a substrate of metal, rubber or plastic, and thereby a member having a desired coating film function can be obtained
Implementation Method 4
using a solid lubricant for high adhesion and sliding properties... maintaining lubricating properties over time
Data Source
AI summary
The present invention addresses the problem of providing an aqueous coating agent composition (in particular, an aqueous lubricating film paint composition that includes a solid lubricant) that suppresses the interaction of a curable resin and a surfactant, suppresses thickening/disproportionation throughout an aqueous coating agent, has superior overall fluidity, coating properties, and storage stability, and can form a favorable coating film, along with the problem of providing a member provided with said coating film, as well as a method for forming said coating film. Said problems can be solved by an aqueous coating agent composition that includes (A) a curable resin in the form of an aqueous emulsion, (B) a surfactant, (C) solid particles, (D) one or more nitrogen-containing heterocyclic compounds, and (E) water. In particular, the component (C) preferably includes a solid lubricant, and for reasons of environmental regulations, it is particularly preferable that the component (D) be 1,3-dimethyl-2-imidazolidinone.