Polyurethane Resin Cyclic Carbonate Structure Thermal Stability
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Solution Overview
Problem
Conventional polyurethane resins with linear aliphatic frameworks exhibit flexibility, leading to potential flow or decomposition under thermal loads and limited substrate compatibility, resulting in compromised adhesive properties.
Innovation Solution
A polyurethane resin composition featuring a polycarbonate diol with a specific framework, combined with an organic diisocyanate and a chain extender, which enhances heat resistance and adhesive properties across various substrates by maintaining flexibility and cohesive force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a polyurethane resin contains a large quantity of linear aliphatic frameworks to improve flexibility and reactivity, then the coating film becomes flexible and reactivity improves, but the adhesive agent may flow out or decompose under thermal load, deteriorating adhesive property
Solution Approach 1:
The invention changes the chemical structure parameter of the polyol component from conventional linear aliphatic frameworks to cyclic carbonate structures (specifically 1,4-dioxane-2,3-dione and 1,3-dioxolan-2-one rings). This structural parameter change maintains the flexibility needed for ease of operation while the cyclic structure provides thermal stability that prevents flow and decomposition under thermal load, thereby resolving the contradiction between flexibility and thermal load resistance.
Solution Approach 2:
The invention creates a composite molecular structure by combining cyclic carbonate polyol components with specific diisocyanate and chain extender components in defined ratios. This composite approach integrates the flexibility benefits of aliphatic structures with the thermal stability of cyclic carbonate rings, achieving both ease of operation and reliability under thermal conditions simultaneously.
2Ease of operation
If a polyurethane resin uses linear aliphatic frameworks to achieve flexibility, then the coating film becomes flexible, but the types of substrates to which the adhesive agent can exert adhesive property are limited, narrowing substrate selectivity
Solution Approach 1:
The invention modifies the chemical composition parameters by incorporating cyclic carbonate structures (1,4-dioxane-2,3-dione and 1,3-dioxolan-2-one) into the polyol backbone. This structural parameter change enhances substrate selectivity through improved chemical bonding capabilities while preserving the flexibility required for ease of operation, thereby resolving the contradiction between flexibility and substrate versatility.
Solution Approach 2:
The cyclic carbonate polyol structure provides multi-functional adhesive capability, enabling the adhesive agent to effectively bond to diverse substrate types including metals, plastics, and ceramics. This universal adhesive performance is achieved while maintaining the flexibility needed for ease of operation, thus resolving the limitation in substrate selectivity.
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 resin composition demonstrates excellent adhesive properties and heat resistance, making it suitable for applications like screen inks and decorative molding, while preventing deterioration under thermal loads and maintaining flexibility.
Implementation Method 1
a polyurethane resin containing, as copolymerization components, a polycarbonate polyol (A), an organic diisocyanate (B) and a chain extender (C)
Implementation Method 2
maintaining flexibility and cohesive force
Data Source
AI summary
Disclosed herein is a polyurethane resin containing, as copolymerization components, a polycarbonate polyol (A), an organic diisocyanate (B) and a chain extender (C), wherein the polycarbonate polyol (A) contains a specific structure in an amount of 60 mol% or more and a glass transition temperature of the polyurethane resin is 50°C or higher. The polyurethane resin has excellent heat resistance and satisfactory adhesive property to various substrates, and is usable as an adhesive composition.