Polycarbonate Diol Composition for Coating Stain Resistance
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Solution Overview
Problem
Polyurethane resins, particularly those using polycarbonate diol, lack sufficient stain resistance and chemical resistance for applications in coatings and adhesives, especially in furniture and automotive coatings where strict physical properties are required.
Innovation Solution
A polycarbonate diol composition is developed with a specific structure incorporating a polyoxyethylene structure and a polycarbonate structure, with a molecular weight range of 300 to 10000, and a specific ratio of polyoxyethylene to polycarbonate, which enhances stain resistance and chemical resistance by forming a coating film with improved water, heat, and chemical resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polycarbonate diol is used as a polyol component in polyurethane resins, then scratch resistance is improved, but stain resistance and chemical resistance remain insufficient
Solution Approach 1:
The patent employs a composite polyol system combining polycarbonate diol (providing scratch resistance) with polyester polyol (enhancing stain and chemical resistance). This composite approach allows the polyurethane resin to simultaneously achieve superior scratch resistance from the polycarbonate component while gaining improved stain and chemical resistance from the polyester component, thereby resolving the contradiction between these performance requirements.
2Ease of manufacture
If polyether or polyester is used as polyol component, then processing is easier, but resistance properties (heat, weather, hydrolysis, solvent, sunscreen, scratch) are insufficient
Solution Approach 1:
The patent creates a composite polyol system that combines polycarbonate diol (providing excellent resistance properties including scratch, heat, and chemical resistance) with polyester polyol (offering good processability). This composite approach enables the polyurethane resin to maintain ease of processing while achieving superior multi-faceted resistance properties that neither component could provide alone.
Data Source
AI summary
An object of the present invention is to provide a polycarbonate diol composition capable of forming a coating film excellent in stain resistance and chemical resistance. The present invention provides a polycarbonate diol composition comprising a specific polyoxyethylene structure and a specific polycarbonate structure, the polycarbonate diol composition having hydroxy groups at both ends and having a number-average molecular weight of 300 or larger and 10000 or smaller, wherein the polycarbonate diol composition comprises 5% by mass or more and 50% by mass or less of the polyoxyethylene structure and 50% by mass or more and 95% by mass or less of the polycarbonate structure based on a total mass of the polyoxyethylene structure and the polycarbonate structure, and among dihydroxy compounds obtained by a hydrolysis of the polycarbonate diol composition, a dihydroxy compound except for a dihydroxy compound having a polyoxyethylene structure comprises a specific dihydroxy compound.