Polyurethane resin composition, cured product, fiber laminate, and artificial leather
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Solution Overview
Problem
The polyurethane resin compositions used in artificial leathers suffer from degradation of flexibility at low temperatures, necessitating a solution that provides both high durability and flexibility in such conditions.
Innovation Solution
A polyurethane resin composition is developed by chain-extending a reaction product between a polycarbonate polyol derived from 1,10-decanediol, a polyhydric alcohol with three or more hydroxy groups, and a polyol with an anionic hydrophilic group, using polyisocyanate, which results in an aqueous dispersion that maintains high durability and flexibility at low temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polyurethane resin composition is used to provide durability, then durability is improved, but flexibility at low temperatures deteriorates
Solution Approach 1:
The patent changes the chemical parameters of the polyol components, specifically using a polycarbonate polyol with a number-average molecular weight of 1,000-3,000 and a polyhydric alcohol with 3 or more hydroxy groups and a number-average molecular weight of 400-1,500. This parameter optimization resolves the contradiction by achieving both durability and low-temperature flexibility simultaneously.
Solution Approach 2:
The patent creates a composite polyurethane resin system by combining multiple polyol types (polycarbonate polyol, polyhydric alcohol, and polyol with anionic hydrophilic group) in specific ratios. This composite approach allows the material to exhibit both high durability and maintained flexibility at low temperatures, resolving the technical contradiction between these two properties.
2Reliability
If the molecular weight of polyhydric alcohol is increased to improve durability, then durability is improved, but flexibility at low temperatures deteriorates
Solution Approach 1:
The patent optimizes the molecular weight parameter of the polyhydric alcohol to a specific range (400-1,500 number-average molecular weight). This precise parameter control allows the resin to achieve high durability through adequate molecular weight while maintaining flexibility at low temperatures by not exceeding the optimal range, thus resolving the contradiction between these two requirements.
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 higher durability and flexibility at low temperatures, as demonstrated by its ability to maintain stress levels and resist abrasion, making it suitable for applications in artificial leathers.
Implementation Method 1
an aqueous-dispersion polycarbonate-based polyurethane resin composition produced by chain-extending, using a polyamine compound containing, in a single molecule, two or more amino groups of at least one selected from the group consisting of a primary amino group and a secondary amino group, a urethane prepolymer
Implementation Method 2
a reaction product between a polyol including a polycarbonate polyol including a structural unit derived from 1,10-decanediol, a polyhydric alcohol including, as functional groups, three or more hydroxy groups alone and having a number-average molecular weight of 420 or more and 2000 or less, and a polyol including an anionic hydrophilic group, and polyisocyanate
Data Source
AI summary
Provided is a technique that provides high durability and high flexibility at low temperatures.A polyurethane resin composition is produced by chain-extending, using polyamine, a reaction product between a polyol including a polycarbonate polyol including a structural unit derived from 1,10-decanediol, a polyhydric alcohol including, as functional groups, three or more hydroxy groups alone and having a number-average molecular weight of 420 or more and 2000 or less, and a polyol including an anionic hydrophilic group, and polyisocyanate.