Polyisocyanate Composition Balancing Adhesion and Durability
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Solution Overview
Problem
Existing polyurethane resins lack improvements in mechanical properties, adhesive properties, and durability such as tensile strength, elongation, impact resistance, solvent resistance, acid resistance, alkali resistance, and weather resistance.
Innovation Solution
A polyisocyanate composition containing modified xylylene diisocyanate and pentamethylene diisocyanate with specific mole ratios, modified with alcohol to include isocyanurate groups, is used to produce a polyurethane resin through a two-component curable composition, which is then used to create coating and adhesive materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional polyisocyanate compositions are used, then basic polyurethane resin properties are achieved, but mechanical properties, adhesive properties, and durability are insufficient
Solution Approach 1:
The patent changes the chemical composition parameters by incorporating specific ratios of xylylene diisocyanate (30-90 wt%) and pentamethylene diisocyanate (10-70 wt%), along with their modified products containing isocyanurate groups. This parameter optimization simultaneously improves mechanical properties, adhesive properties, and durability without requiring multiple different formulations.
Solution Approach 2:
The patent creates a composite polyisocyanate system by combining conventional xylylene diisocyanate with pentamethylene diisocyanate and their alcohol-modified products containing isocyanurate groups. This composite approach integrates the benefits of different isocyanate types to achieve superior mechanical strength, adhesion, and durability in a single formulation.
2Strength
If polyisocyanate composition with high isocyanurate group content is used, then mechanical properties and durability are improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-modifying the isocyanate components with alcohols to form modified products containing isocyanurate groups before final polyurethane resin synthesis. This pre-preparation of modified isocyanate components simplifies the overall manufacturing process while ensuring the desired mechanical properties are achieved.
Solution Approach 2:
The patent optimizes the concentration of isocyanurate groups within a specific range (10-40 wt%) to achieve the desired tensile strength and mechanical properties. By controlling this parameter within an optimal range rather than maximizing it, the manufacturing process remains manageable while still achieving superior strength characteristics.
3Strength
If polyisocyanate composition with specific mole ratio of pentamethylene diisocyanate (30-80 mol%) is used, then adhesive properties and impact resistance are enhanced, but formulation complexity increases
Solution Approach 1:
The patent specifies a particular mole ratio range for pentamethylene diisocyanate (30-80 mol%) to optimize impact resistance and adhesive properties. By defining this parameter within a specific range, the patent achieves enhanced mechanical performance while keeping the formulation relatively simple and manageable for industrial production.
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 materials exhibit enhanced mechanical properties, adhesive properties, and durability, including improved tensile strength, elongation, impact resistance, solvent resistance, acid resistance, and weather resistance.
Implementation Method 1
A polyurethane resin is usually produced by reaction of polyisocyanate with an active hydrogen group-containing compound
Implementation Method 2
the modified product of xylylene diisocyanate is modified with an alcohol and contains an isocyanurate group (a)
Data Source
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AI summary
A polyisocyanate composition contains a modified product of xylylene diisocyanate and a modified product of pentamethylene diisocyanate, and/or a modified product of the xylylene diisocyanate and the pentamethylene diisocyanate. The ratio of the pentamethylene diisocyanate with respect to the total amount of the xylylene diisocyanate and the pentamethylene diisocyanate is 30 mol% or more and 80 mol% or less.