Blocked Isocyanate Dual-Blocking Agent Balance
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Solution Overview
Problem
Existing polyurethane resins using blocked isocyanates from Patent Document 1 lack balanced performance in solvent resistance, bend resistance, and shock resistance, particularly when used in coating materials or adhesives.
Innovation Solution
A blocked isocyanate formulation that includes a polyisocyanate compound modified with a high molecular weight polyol, blocked with a first guanidine-based blocking agent and a second imidazole-based blocking agent, enhancing the resin's solvent, bend, and shock resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If blocked isocyanate from Patent Document 1 is used, then pot life of polyurethane resin composition is improved, but solvent resistance, bend resistance, and shock resistance are not secured in good balance
Solution Approach 1:
The patent changes the molecular weight parameter of the polyol component to 250 or more (high molecular weight polyol) and adjusts the NCO group content to 1-30 mass%, which simultaneously achieves extended pot life through controlled reaction kinetics and improved mechanical properties including solvent resistance, bend resistance, and shock resistance through enhanced polymer chain structure
Solution Approach 2:
The patent creates a composite polyurethane resin composition by combining high molecular weight polyol (250 or more) with polyisocyanate in specific ratios, forming a multi-component system that achieves balanced performance in pot life, solvent resistance, bend resistance, and shock resistance through synergistic interaction of components
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 proposed blocked isocyanate significantly improves the solvent resistance, bend resistance, and shock resistance of polyurethane resins, achieving a good balance among these properties.
Implementation Method 1
the blocking agent dissociates by heating, and the isocyanate group is regenerated
Data Source
AI summary
The blocked isocyanate contains a first latent isocyanate group in which the isocyanate group is blocked with a first blocking agent and a second latent isocyanate group in which the isocyanate group is blocked with a second blocking agent. The first blocking agent is represented by general formula (1) and has a higher catalyst activity that activates the isocyanate group than that of the second blocking agent, and the polyisocyanate compound is a reaction product of a high molecular weight polyol having a number average molecular weight of 250 or more and polyisocyanate. (in the formula, R1 to R3 represent a hydrocarbon group having 1 to 12 carbon atoms or a hydrogen atom and at least one of R1 to R3 represents a hydrogen atom, and R1 and R3 are optionally bonded to each other to form a heterocycle. R4 and R5 represent a hydrocarbon group having 1 to 12 carbon atoms, R4 and R1 are optionally bonded to each other to form a heterocycle, and R5 and R3 are optionally bonded to each other to form a heterocycle).