Base Coating Composition for Low-Temperature Curing
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Solution Overview
Problem
Existing aqueous coating material compositions for plastics with low heat resistance exhibit insufficient chipping resistance, coating film hardness, and water resistance when cured at low temperatures.
Innovation Solution
A base coating composition containing a polyisocyanate component with a sulfonic acid anion group and a hydroxyl group-containing resin, specifically formulated with uretdione dimers, isocyanurate trimers, and iminooxadiazinedione groups, which forms a multilayer coating film laminate with excellent hardness and water resistance when cured at low temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional aqueous coating material compositions are used for low heat resistance plastics, then environmental pollution is prevented, but chipping resistance and coating film hardness are insufficient at low curing temperatures
Solution Approach 1:
The patent modifies the chemical composition parameters of the polyisocyanate component by introducing specific functional groups (sulfonic acid anion group, uretdione dimers, isocyanurate trimers, iminooxadiazinedione groups) and controlling their content ratios, enabling the coating to achieve high hardness and chipping resistance at low curing temperatures without sacrificing environmental benefits
Solution Approach 2:
The patent creates a composite coating system by combining multiple functional groups within the polyisocyanate component (uretdione dimers, isocyanurate trimers, iminooxadiazinedione groups, sulfonic acid anion groups) that work synergistically to provide enhanced mechanical properties at low temperatures while maintaining aqueous composition benefits
2Reliability
If conventional aqueous coating material compositions are used for low heat resistance plastics, then environmental pollution is prevented, but water resistance is insufficient at low curing temperatures
Solution Approach 1:
The patent introduces and optimizes the content ratio of sulfonic acid anion groups and iminooxadiazinedione groups in the polyisocyanate component, which chemically enhance the coating's water resistance properties at low curing temperatures while maintaining the environmentally friendly aqueous composition
3Strength
If the curing temperature is lowered to protect low heat resistance plastics, then the plastics are protected from heat damage, but coating film hardness and chipping resistance deteriorate
Solution Approach 1:
The patent modifies the polyisocyanate component's chemical structure by incorporating specific functional groups with optimized content ratios, allowing the coating to achieve crosslinking and hardening at low temperatures without sacrificing film hardness or chipping resistance
Solution Approach 2:
The patent replaces conventional high-temperature curing mechanisms with a chemically enhanced low-temperature curing system using specific polyisocyanate functional groups that facilitate crosslinking at lower temperatures, substituting thermal energy with chemical reactivity to achieve comparable or superior film properties
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 enhanced hardness and water resistance in multilayer coating film laminates even when cured at temperatures between 40°C and 140°C, improving durability and performance on low-heat-resistant plastics.
Implementation Method 1
a base coating composition contains a polyisocyanate component (A) and a hydroxyl group-containing resin component
Implementation Method 2
when the curing temperature is low, the chipping resistance, coating film hardness and the like of a multilayer coating film laminate may be insufficient
Data Source
AI summary
The present invention provides a base coating composition for forming a multilayer coating film laminate on an object to be coated, wherein the multilayer coating film laminate includes a base layer and one or more coating films; the base coating composition contains a polyisocyanate component (A) and a hydroxyl group-containing resin component; and the polyisocyanate component (A) contains a polyisocyanate containing a sulfonic acid anion group within a molecule, and one or more tertiary ammonium cations of an amine compound represented by a general formula (1).