Polycarbonate Diol Coating Composition for Flaw Restorability and Stain Resistance
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Solution Overview
Problem
Existing coating compositions fail to provide both high flaw restorability and stain resistance simultaneously.
Innovation Solution
A coating composition comprising a polycarbonate diol with specific repeating units, a polyol, and an organic polyisocyanate, where the polycarbonate diol has a controlled molar ratio of repeating units and a terminal hydroxyl group, and the polyol and polyisocyanate are used in specific mass percentages to form a film with improved stain resistance and flaw restorability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional coating compositions are used, then either flaw restorability or stain resistance can be achieved, but not both simultaneously
Solution Approach 1:
The patent changes the chemical parameters of the polyol component by specifying a particular structural formula (formula A) with defined molecular weight range (500-2000) and hydroxyl value range (30-70). This parameter optimization enables the coating film to achieve both high flaw restorability through molecular mobility and high stain resistance through appropriate polarity and bonding characteristics.
Solution Approach 2:
The patent creates a composite coating system combining three specific components: a polycarbonate diol (component α), a specially structured polyol (component β) comprising 30-80 mass% of total polyols, and an organic polyisocyanate (component γ). This composite formulation synergistically achieves both flaw restorability and stain resistance that cannot be obtained with single materials.
2Reliability
If the polyol content is increased to improve flaw restorability, then the coating film becomes more flexible and self-healing, but the stain resistance may deteriorate
Solution Approach 1:
The patent precisely controls the polyol composition parameters by specifying that component β must comprise 30-80 mass% of the total polyol content, with molecular weight of 500-2000 and hydroxyl value of 30-70. This optimized parameter range ensures sufficient polyol content for flaw restorability while maintaining appropriate film density for stain resistance.
Solution Approach 2:
The patent introduces a polyol with specific local molecular structure (formula A) that provides different functional characteristics at different levels: the molecular structure enables chain mobility for self-healing while the overall composition maintains film integrity for stain resistance, achieving local quality optimization.
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 a coating film with high flaw restorability and stain resistance, maintaining performance across various environmental conditions.
Implementation Method 1
a coating composition comprising the following component α, the following component β and the following component γ; component α: a polycarbonate diol... component β: a polyol... component γ: an organic polyisocyanate
Data Source
AI summary
The present invention has an object to provide a coating composition capable of providing a coating film having both high flaw restorability and stain resistance. Solution The coating composition comprises the following component α, the following component β and the following component γ: component α: a polycarbonate diol comprising repeating units represented by specific formulae (A) and (B) and a terminal hydroxyl group, wherein a molar ratio (the repeating unit represented by the formula (A)/the repeating unit represented by the formula (B)) between the repeating units represented by the formulae (A) and (B) is 1/99 to 100/0, and an average number of carbon atoms of the repeating units is 3.0 to 4.0; component β: a polyol other than the component α; and component γ: an organic polyisocyanate.