Polyurethane Coating Curing Composition for Surface Smoothing
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Solution Overview
Problem
There is a strong demand for surface smoothing agents for polyurethane coating films that can impart excellent smoothness to meet the high performance requirements of modern polyurethane coatings.
Innovation Solution
A composition comprising a polyisocyanate with a cyclic compound derived from an aliphatic diisocyanate, specifically a cyclic compound represented by formula (1), is used to form a polyurethane resin, which is then combined with a polyol to create a coating composition that results in a coating film with enhanced surface smoothness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional curing agents (aliphatic isocyanate derivatives) are used to form polyurethane coating films, then weather resistance and reduced baking temperature are achieved, but surface smoothness is insufficient to meet high performance requirements
Solution Approach 1:
The invention changes the chemical composition parameters of the curing agent by incorporating cyclic compounds (15-40 mass%) derived from aliphatic diisocyanates with specific molecular structures (formulas 1-4). This compositional parameter change enables the coating film to achieve both excellent weather resistance and superior surface smoothness (arithmetic average roughness of 50 nm or less), resolving the contradiction between reliability and manufacturing precision.
Solution Approach 2:
The invention uses a composite curing agent system combining multiple components: polyisocyanates (50-85 mass%), cyclic compounds (15-40 mass%), and optionally other additives. This composite material approach leverages the synergistic effects of different compounds to simultaneously achieve weather resistance, surface smoothness, and mechanical properties that single compounds cannot provide alone.
2Strength
If isobutyl alcohol-modified polyisocyanate is used to improve hardness and chemical resistance, then these properties are enhanced, but surface smoothness improvement is limited
Solution Approach 1:
The invention changes the molecular structure parameters of the curing agent by using cyclic compounds with specific structures (formulas 1-4) instead of conventional isobutyl alcohol-modified polyisocyanates. The cyclic structure with specific ring sizes and substituents provides both the hardness and surface smoothness improvements that conventional modifications cannot achieve alone.
Solution Approach 2:
The invention applies local quality by incorporating cyclic compounds with specific molecular characteristics (formulas 1-4) that target surface properties while maintaining bulk material strength. The specific cyclic structures provide localized surface smoothing effects without compromising the overall hardness and chemical resistance of the coating film.
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 solution provides a coating film with superior surface smoothness, improved mechanical properties, and enhanced weather resistance.
Implementation Method 1
A composition comprising a polyisocyanate, wherein the polyisocyanate comprises a derivative derived from an aliphatic diisocyanate, and a content of a cyclic compound represented by the following formula (1) is from 0.1 to 15% by mass with respect to a total amount of the composition
Data Source
AI summary
A composition comprising a polyisocyanate, wherein the polyisocyanate comprises a derivative derived from an aliphatic diisocyanate, and a content of a cyclic compound represented by the following formula (1) is from 0.1 to 15% by mass with respect to a total amount of the composition. [In Formula (1), n is an integer from 1 to 6, and R1 and R2 are each independently a hydrogen atom or a monovalent organic group having 1 to 20 carbon atoms.]