Chipping-Resistant Coating Composition with Cyclic Polyol
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Solution Overview
Problem
Existing chipping-resistant coating compositions for automobiles are insufficient in smoothness and water resistance, particularly when the film thickness is small, leading to inadequate chipping and water resistance.
Innovation Solution
A chipping-resistant coating composition containing a hydroxyl group-containing urethane resin obtained by reacting a polyol component with a cyclic polyol compound having a nurate structure and a polyisocyanate compound, along with a curing agent, which includes a polyisocyanate and/or blocked polyisocyanate, and an epoxy resin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a chipping-resistant coating composition containing whisker-like calcium carbonate is used, then chipping resistance is improved, but smoothness and water resistance are insufficient
Solution Approach 1:
The patent uses a composite resin system combining polyester resin and polyurethane resin in specific ratios (polyester resin 20-80 wt%, polyurethane resin 80-20 wt%). This composite material approach allows the coating to achieve both chipping resistance from the polyester component and water resistance along with smoothness from the polyurethane component, resolving the contradiction between chipping resistance and water resistance/smoothness
Solution Approach 2:
The patent specifies precise parameter ranges for the resin components: polyester resin with hydroxyl value of 10-100 mg KOH/g and polyurethane resin with hydroxyl value of 10-100 mg KOH/g, along with specific curing agent ratios (0.5-5 equivalents relative to hydroxyl groups). These parameter optimizations ensure the coating achieves adequate chipping resistance, water resistance, and smoothness simultaneously
2Productivity
If the film thickness is reduced, then productivity is improved, but chipping resistance and water resistance become insufficient
Solution Approach 1:
The patent optimizes the chemical composition parameters of the coating system, specifically the resin types and their hydroxyl values, along with the curing agent equivalence ratio (0.5-5 equivalents). This creates a highly crosslinked dense network structure that achieves sufficient water resistance and chipping resistance even at reduced film thicknesses, thereby improving coating productivity without sacrificing performance
Solution Approach 2:
The composite resin system (polyester + polyurethane) creates a synergistic effect where the polyester provides structural integrity for chipping resistance and the polyurethane contributes to water resistance and smoothness. This composite approach enables thin films to achieve adequate protective performance, allowing reduced film thickness while maintaining reliability
3Productivity
If the film thickness is reduced, then productivity is improved, but smoothness deteriorates
Solution Approach 1:
The polyurethane resin component in the composite system specifically contributes to smoothness and coated film appearance. By incorporating polyurethane resin in optimized ratios (80-20 wt% relative to polyester resin), the coating achieves excellent smoothness even at thinner film thicknesses, allowing improved productivity without sacrificing manufacturing precision and surface quality
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 forms a coated film that is excellent in both chipping resistance and water resistance, with improved smoothness and durability, even at thinner film thicknesses.
Implementation Method 1
a hydroxyl group-containing urethane resin (A) obtained by reacting a polyol component (a) composed of a cyclic polyol compound (a1) having a nurate structure and another polyol compound (a2) with a polyisocyanate compound (b)
Data Source
AI summary
The present invention provides a chipping-resistant coating composition including a hydroxyl group-containing urethane resin (A) obtained by reacting a polyol component (a) composed of a cyclic polyol compound (a1) having a nurate structure and another polyol compound (a2) with a polyisocyanate compound (b), and a curing agent (B). This chipping-resistant coating composition is capable of forming a coated film excellent in chipping resistance and water resistance. Furthermore, the present invention also provides an article coated with the chipping-resistant coating composition.