Core-Shell Resin Coating Agent for Low-Temperature Curing
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Solution Overview
Problem
Current coating agents fail to form coating films with excellent solvent resistance, water resistance, and chemical resistance on plastic and metallic base materials, especially at low drying temperatures, and struggle with adhesiveness to sparingly adhesive plastic materials and corrosion resistance on metals.
Innovation Solution
A coating agent containing core-shell type resin particles with a urethane resin shell layer and a vinyl polymer core layer, combined with a compound having an epoxy group and a hydrolyzable silyl or silanol group, which reacts with the resin particles to form a crosslinked film at low temperatures, enhancing solvent, water, and chemical resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the drying temperature is set at 60°C or below to avoid plasticization of plastic base materials, then the base material integrity is preserved, but the crosslinked structure between binder resins is not formed sufficiently, resulting in poor solvent resistance and water resistance
Solution Approach 1:
The invention changes the chemical composition parameters of the coating agent by incorporating specific binder resins with reactive functional groups (carboxyl groups, hydroxyl groups, amino groups) that can form crosslinked structures at low temperatures through chemical reactions with isocyanate groups, thereby achieving sufficient crosslinking and resistance properties without requiring high drying temperatures that would cause plastic base material deformation
Solution Approach 2:
The invention uses a composite binder resin system combining multiple resin components (polyester resin, polyacrylic resin, polyurethane resin) with complementary properties, where each component contributes specific functions such as adhesion, flexibility, and crosslinking capability, enabling the formation of a robust crosslinked network at low temperatures that provides excellent solvent and water resistance
2Reliability
If the drying temperature is raised to 200-250°C to rapidly form a crosslinked structure and achieve excellent solvent resistance and water resistance, then the coating film resistance is improved, but the plastic base material undergoes plasticization and deterioration
Solution Approach 1:
The invention changes the chemical reaction parameters by selecting binder resins with functional groups that have high reactivity toward isocyanate groups, allowing crosslinking reactions to proceed rapidly at low temperatures (60°C or below), thereby eliminating the need for high temperature drying while still achieving excellent solvent and water resistance
Solution Approach 2:
The invention replaces the thermal energy mechanism (high temperature drying) with a chemical energy mechanism (reactive crosslinking between functional groups), where the crosslinked structure is formed through chemical reactions rather than thermal activation, thus achieving the same resistance properties without subjecting the plastic base material to damaging high temperatures
3Ease of manufacture
If conventional coating agents are used on sparingly adhesive plastic base materials like ABS resins, then the coating process is simple, but the adhesiveness of the coating film is insufficient
Solution Approach 1:
The invention changes the chemical composition parameters of the binder resin by incorporating functional groups (carboxyl groups, hydroxyl groups, amino groups) that can form strong chemical bonds with the plastic base material surface, significantly enhancing adhesion strength while maintaining coating process simplicity through direct application without complex surface treatment steps
Solution Approach 2:
The binder resin acts as an intermediary between the coating film and the plastic base material, with its functional groups forming strong chemical bonds with both the base material surface and the coating resin, thereby bridging the adhesion gap between incompatible materials and ensuring strong bonding without complicating the coating process
4Productivity
If the drying temperature is reduced to about 80°C to enhance production efficiency in the steel industry, then the production efficiency is improved, but the chemical resistance and corrosion resistance of the coating film are insufficient
Solution Approach 1:
The invention changes the chemical composition of the coating agent by incorporating binder resins with high-reactivity functional groups that can form dense crosslinked structures at low drying temperatures (around 80°C), thereby achieving excellent chemical and corrosion resistance while maintaining high production efficiency through rapid low-temperature curing
Solution Approach 2:
The invention ensures continuous crosslinking reaction throughout the drying process at low temperature, where the reactive functional groups continuously form crosslinked bonds even at 80°C, maintaining the useful action of crosslinking that would normally require high temperatures, thereby achieving both high productivity and excellent chemical/corrosion resistance
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 achieves excellent solvent resistance, water resistance, and chemical resistance, even at low drying temperatures, while maintaining adhesiveness to plastic materials and preventing corrosion on metals, making it suitable for various applications including automotive and construction materials.
Implementation Method 1
a compound (B) having an epoxy group and at least one selected from the group consisting of a hydrolyzable silyl group and a silanol group
Implementation Method 2
a compound (B) having an epoxy group and at least one selected from the group consisting of a hydrolyzable silyl group and a silanol group
Data Source
AI summary
Disclosed is a coating agent characterized by comprising: a core-shell-type resin particles (A) each having a shell layer and a core layer; a compound (B) having at least one selected from the group consisting of a hydrolysable silyl group and a silanol group and also having an epoxy group; and an aqueous medium, wherein the shell layer comprises (a1) a urethane resin with 2000 to 5500 mmol/kg of an aliphatic cyclic structure and at least one selected from the group consisting of a carboxyl group and a carboxylate group and the core layer comprises (a2) a vinyl polymer having a basic nitrogen-atom-containing group. Further disclosed are a coating agent for a plastic base material and a coating agent for a metallic base material.