Moldable Polyurethane Resin Composition for Low-Temperature Flexibility

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conventional solvent-free polyurethane resin-forming compositions exhibit insufficient low-temperature flexibility and require a short pot life, making them unsuitable for applications requiring long workability and environmental friendliness.

Innovation Solution

A polyurethane resin-forming composition comprising a polyol component with a first polyol having three or more hydroxyl groups and a second polyol with two hydroxyl groups, a polyisocyanate component with an isocyanate group-terminated urethane prepolymer, and a catalyst, with a minimal organic solvent content, to achieve a long pot life and excellent low-temperature flexibility.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If a solvent-free polyurethane resin-forming composition is used to reduce environmental load, then organic solvent content is reduced, but low-temperature flexibility becomes insufficient

Engineering Contradiction:

Improveorganic solvent contentVSAvoidlow-temperature flexibility

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The invention changes the chemical composition parameters by incorporating specific polyol components (polycarbonate polyester polyol with three or more hydroxyl groups and polycarbonate polyester diol) and controlling their molecular weights and hydroxyl values to achieve both low-temperature flexibility and solvent-free formulation. The polyisocyanate component parameters are also optimized with specific NCO group contents and molecular weights.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention uses a composite polyol system combining polycarbonate polyester polyol and polycarbonate polyester diol with specific properties. This composite material approach allows the formulation to achieve both environmental friendliness (solvent-free) and performance requirements (low-temperature flexibility) through synergistic material combinations.

Inventive Principle:

Principle #40Composite materials

2Object-affected harmful factors

If conventional solvent-free composition is used to reduce environmental load, then organic solvent content is reduced, but pot life becomes short

Engineering Contradiction:

Improveorganic solvent contentVSAvoidpot life

Core Design Contradiction:

Object-affected harmful factorsVSDuration of action of moving object

Solution Approach 1:

The invention optimizes reaction parameters by selecting specific catalyst types and controlling their amounts, along with adjusting the molecular weights and functional group contents of polyol and polyisocyanate components. These parameter changes extend the pot life while maintaining the solvent-free formulation.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention applies local quality control by using a blend of polyol components with different molecular weights and hydroxyl values, and polyisocyanate components with specific NCO group contents. This localized optimization of component properties extends the pot life without requiring organic solvents.

Inventive Principle:

Principle #3Local quality

3Duration of action of moving object

If polyol component with three or more hydroxyl groups and two hydroxyl groups is used to achieve long pot life, then composition complexity increases, but manufacturing difficulty increases

Engineering Contradiction:

Improvepot lifeVSAvoidmanufacturing difficulty

Core Design Contradiction:

Duration of action of moving objectVSEase of manufacture

Solution Approach 1:

The invention uses polycarbonate polyester polyol and polycarbonate polyester diol that serve multiple functions: they provide the necessary hydroxyl groups for extended pot life, contribute to low-temperature flexibility, and maintain compatibility with the polyisocyanate component. This multi-functionality reduces manufacturing complexity despite the multi-component system.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 provides a polyurethane resin with long pot life, excellent low-temperature flexibility, and improved tensile properties, durability, and heat resistance, while being environmentally friendly.

Implementation Method 1

the catalyst includes a metal catalyst containing at least one metallic element selected from the group consisting of titanium, zinc, and aluminum

Methodology Applied

Scientific EffectCatalysis: Catalysis

Implementation Method 2

the polyisocyanate component contains an isocyanate group-terminated urethane prepolymer having a segment derived from diphenylmethane diisocyanate and a segment derived from a polyether polyol

Methodology Applied

Scientific EffectPolymerization: Photopolymerisation

Data Source

PatentEP4624505A1Moldable polyurethane resin composition, polyurethane resin, molded body, and coating agent

Publication Date: 2025.10.01 TOSOH CORP

AI summary

A polyurethane resin-forming composition contains: a main agent containing a polyol component; a curing agent containing a polyisocyanate component; and a catalyst, in which the polyol component contains a first polyol having three or more hydroxyl groups and a second polyol having two hydroxyl groups, the first polyol contains a polycarbonate polyester polyol, the polyisocyanate component contains an isocyanate group-terminated urethane prepolymer having a segment derived from diphenylmethane diisocyanate and a segment derived from a polyether polyol, the catalyst includes a metal catalyst containing at least one metallic element selected from the group consisting of titanium, zinc, and aluminum, and a content of the organic solvent is 0% to 10% by mass.