Polyurea Resin Flexibility Wear Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Thermoplastic polyurethanes obtained using conventional copolymer-type polycarbonate diols from 1,6-hexanediol and 1,4-butanediol or 1,5-pentanediol lack wear resistance and chemical resistance, and have high glass transition temperatures affecting low-temperature properties and flexibility.
Innovation Solution
A polyurea resin is developed by combining a specific organic polyisocyanate compound with a polycarbonate diol having a specific structure and a chain extender, optimizing the isocyanate group content, carbonate group content, and molecular weight to enhance flexibility, strength, wear resistance, and low-temperature properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If copolymer-type polycarbonate diol from 1,6-hexanediol and 1,4-butanediol or 1,5-pentanediol is used, then flexibility is improved, but wear resistance and chemical resistance deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters of the polycarbonate diol by incorporating 1,3-propanediol units alongside 1,6-hexanediol and 1,4-butanediol or 1,5-pentanediol units. This parameter change in the diol composition enables simultaneous achievement of flexibility (through copolymer structure) and wear/chemical resistance (through optimized carbonate group density and molecular structure).
Solution Approach 2:
The patent creates a composite polycarbonate diol structure combining multiple diol components (1,3-propanediol, 1,6-hexanediol, and 1,4-butanediol or 1,5-pentanediol) in specific ratios. This composite approach allows the material to exhibit both the flexibility benefits of copolymerization and the resistance properties of high carbonate group density structures.
2Reliability
If high carbonate group density is achieved in polycarbonate diol, then wear resistance and chemical resistance are improved, but flexibility and low-temperature properties deteriorate due to low molecular mobility and increased glass transition temperature
Solution Approach 1:
The patent optimizes the carbonate group content to a specific range (41.5-45.7% by mass) rather than maximizing it. This parameter optimization balances the competing requirements: maintaining sufficient carbonate group density for wear and chemical resistance while limiting excessive carbonate content that would increase glass transition temperature and reduce flexibility.
Solution Approach 2:
The patent creates local structural variations in the polycarbonate diol by incorporating different diol units (1,3-propanediol, 1,6-hexanediol, 1,4-butanediol or 1,5-pentanediol) in specific proportions. This local structural differentiation allows certain regions to provide carbonate group density for resistance while other regions maintain molecular mobility for flexibility.
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 resulting polyurea resin exhibits superior flexibility, strength, wear resistance, chemical resistance, and low-temperature properties, addressing the limitations of conventional thermoplastic polyurethanes.
Implementation Method 1
a polyurea resin which is a reaction product of polyisocyanate compound (a), polycarbonate diol (b), and chain extender (c)
Data Source
AI summary
An object of the present invention is to provide a polyurea resin superior in flexibility, strength, wear resistance, chemical resistance, and low-temperature properties. A polyurea resin as a reaction product of polyisocyanate compound (a), polycarbonate diol (b), and chain extender (c), wherein polyisocyanate compound (a) is an organic polyisocyanate compound having an average number of an isocyanate group in one molecule of 2.5 or less, polycarbonate diol (b) comprises specific repeating units each represented by the following formula (1) and a terminal hydroxyl group, the carbonate group content of one molecule of polycarbonate diol (b) is 41.5 to 45.7% by mass and the number-average molecular weight of polycarbonate diol (b) is 900 to 3100 g/mol, and chain extender (c) is a diamine.