Polycarbonate Polyol Curable Composition for Durable Synthetic Leather
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Solution Overview
Problem
Conventional synthetic leather lacks durability and sweat resistance, particularly in applications requiring high durability such as automobile sheets.
Innovation Solution
A curable composition comprising specific polycarbonate diols and polyisocyanates, which when cured, produce environment-responsive synthetic leather with improved balance of physical properties including flexibility, chemical resistance, low-temperature characteristics, and heat resistance, while reducing the amount of solvent used.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional polyurethane resin is used for synthetic leather, then flexibility is excellent, but durability and sweat resistance are poor
Solution Approach 1:
The patent changes the chemical composition parameters of the polyol component by using specific ratios of polycarbonate diol (5-50 wt%) and polyester polyol (50-95 wt%), and controls the hydroxyl value within 20-200 mgKOH/g to achieve both flexibility and durability
Solution Approach 2:
The patent creates a composite polyol system by combining polycarbonate diol and polyester polyol in specific proportions, leveraging the flexibility benefits of polycarbonate diol and the durability advantages of polyester polyol to achieve balanced performance
2Reliability
If environment-responsive synthetic leather is produced with improved physical properties, then durability and sweat resistance are enhanced, but solvent usage increases environmental load
Solution Approach 1:
The patent controls the solvent content to 40 wt% or less and optimizes the polyol and isocyanate ratios to enable efficient curing with reduced solvent usage, thereby decreasing environmental load while maintaining high durability performance
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 curable composition effectively produces synthetic leather with enhanced durability, sweat resistance, and reduced solvent usage, addressing the limitations of conventional synthetic leather.
Implementation Method 1
a component (c): a polyisocyanate having an average number of functional groups per molecule, of 2 to 6
Data Source
AI summary
A curable composition including:a component (a): a polycarbonate polyol having a hydroxyl value of 40 to 75 mgKOH/g;a component (b): a polycarbonate polyol having a hydroxyl value of 100 to 280 mgKOH/g; anda component (c): a polyisocyanate having an average number of functional groups per molecule, of 2 to 6.