Dual Blocking Agent Blocked Isocyanate for Low-Temperature Curing
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Solution Overview
Problem
Blocked isocyanates used as curing agents have insufficient low-temperature curing properties, which is a disadvantage in terms of energy efficiency and cost-effectiveness.
Innovation Solution
A blocked isocyanate composition containing a first latent isocyanate group blocked with a first blocking agent and a second latent isocyanate group blocked with a second blocking agent, where the first blocking agent has higher catalysis activity to activate the isocyanate group at lower temperatures, improving low-temperature curing properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If a conventional blocking agent is used to block the isocyanate group, then the pot life is extended and processability is improved, but the low temperature curing properties are insufficient
Solution Approach 1:
The patent divides the single blocking agent system into a dual blocking agent system. The first blocking agent (formula 1) provides moderate blocking with good low-temperature curing properties, while the second blocking agent (formula 2) provides strong blocking with excellent pot life extension. This segmentation allows each blocking agent to perform its specialized function without compromise.
Solution Approach 2:
The patent changes the chemical structure parameters of the blocking agents by introducing two different types with distinct molecular formulas. The first blocking agent has a specific structural parameter set that enables low-temperature activation, while the second blocking agent has different structural parameters that enhance thermal stability and pot life. This parameter optimization resolves the contradiction between curing temperature and pot life.
2Reliability
If the blocking agent is dissociated by heating to be cured, then the curing reaction proceeds, but energy consumption increases
Solution Approach 1:
The patent optimizes the dissociation temperature parameter of the blocking agents. The first blocking agent is designed to dissociate at relatively low temperatures, enabling the curing reaction to proceed without high energy input. This parameter change directly addresses the energy consumption issue while maintaining reliable curing.
Solution Approach 2:
The patent replaces the conventional high-temperature thermal activation mechanism with a lower-temperature chemical activation mechanism. The first blocking agent's molecular structure allows for easier dissociation and lower activation energy requirement, substituting the need for high thermal energy with a more energy-efficient chemical process.
3Device complexity
If a single blocking agent is used, then the formulation is simple, but both pot life extension and low temperature curing properties cannot be optimized simultaneously
Solution Approach 1:
The patent segments the blocking agent function into two specialized components. The first blocking agent (formula 1) at 30-70 mol% provides low-temperature curing capability, while the second blocking agent (formula 2) at 30-70 mol% provides pot life extension. This functional segmentation achieves performance optimization without excessive complexity.
Solution Approach 2:
The patent creates a composite blocking agent system by combining two different blocking agents with complementary properties. This composite approach allows the formulation to exhibit both long pot life and excellent low-temperature curing properties, achieving versatility that neither blocking agent could provide alone.
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 blocked isocyanate composition achieves excellent low-temperature curing properties, reducing energy consumption and costs while maintaining a relatively long pot life, making it suitable for use in coating and adhesive applications.
Implementation Method 1
the first blocking agent represented by general formula (1), and has a higher catalysis activity that activates the isocyanate group than that of the second blocking agent
Implementation Method 2
the blocking agent is dissociated by heat and the isocyanate group is regenerated
Data Source
AI summary
The blocked isocyanate is a blocked isocyanate containing a latent isocyanate group, which is an isocyanate group blocked with a blocking agent, wherein the blocked isocyanate includes a first latent isocyanate group that is an isocyanate group blocked with a first blocking agent and a second latent isocyanate group that is an isocyanate group blocked with a second blocking agent; and the first blocking agent is represented by general formula (1) below, and has a higher catalysis activity that activates the isocyanate group than that of the second blocking agent.(where 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 may be bonded to each other to form a heterocycle. R4 represents a hydrocarbon group having 1 to 12 carbon atoms, a hydrogen atom, or an atomic group represented by —NR5R6 (R5 and R6 represent a hydrocarbon group having 1 to 12 carbon atoms, and R5 and R1 may be bonded to each other to form a heterocycle and R6 and R3 may be bonded to each other to form a heterocycle).