Two-Component Curable Composition Branching Coefficient
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Solution Overview
Problem
Conventional two-component adhesives and coatings face issues with incomplete curing due to excessive second agents, leading to residual isocyanate compounds in packaging films, which react with water to produce amine compounds and carbon dioxide, causing toxicity and air bubbles, and reducing adhesive strength and coating film properties.
Innovation Solution
A two-component curable composition with a first agent having a branching coefficient of 1/f or more and a second agent with an average of 2.5 or more functional groups, used at an equivalent ratio of 0.15 to 0.5, ensuring sufficient curing and minimizing residual second agents in adhesive and coating layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the amount of second agent is excessive to prevent insufficient curing, then curing completeness is improved, but residual isocyanate compounds increase causing toxicity and air bubbles
Solution Approach 1:
The patent changes the equivalent ratio parameter of the second agent to a specific range (0.15-0.5) rather than using excessive amounts conventionally. This parameter optimization allows sufficient curing while minimizing residual isocyanate compounds, resolving the contradiction between curing completeness and harmful residue reduction.
Solution Approach 2:
The patent applies partial action by using a controlled excess of the second agent within specific limits (equivalent ratio 0.15-0.5) rather than complete excessive addition. This partial excess ensures adequate curing reaction while preventing excessive residual isocyanate that would cause toxicity and air bubbles.
2Object-generated harmful factors
If the amount of second agent is decreased to reduce residual compounds, then toxicity is reduced, but curing becomes insufficient reducing adhesive strength
Solution Approach 1:
The patent optimizes the equivalent ratio parameter to a specific range (0.15-0.5) that balances curing sufficiency and residual compound minimization. This parameter change ensures adequate adhesive strength while reducing toxicity from residual isocyanate compounds.
Solution Approach 2:
The patent incorporates feedback mechanisms through controlled equivalent ratio (0.15-0.5) that monitors and adjusts the balance between curing reaction and residual compound formation. This feedback control ensures sufficient curing for adhesive strength while minimizing harmful residues.
3Object-generated harmful factors
If the equivalent ratio of second functional group to first functional group is reduced to minimize residual agents, then toxicity is reduced, but curing reaction becomes insufficient
Solution Approach 1:
The patent changes the equivalent ratio parameter to a specific optimized range (0.15-0.5) that ensures sufficient curing reaction while minimizing residual second agents. This parameter optimization resolves the contradiction between reducing harmful residues and maintaining adequate curing.
Solution Approach 2:
The patent applies partial excess action by maintaining the second agent in excess within controlled limits (equivalent ratio 0.15-0.5). This partial excess ensures adequate curing reaction reliability while minimizing residual agents that would cause toxicity.
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 achieves complete curing with reduced toxicity and air bubbles, maintaining adhesive strength and coating film properties while minimizing residual second agents, resulting in a laminate with excellent appearance and barrier properties.
Implementation Method 1
a first agent which is produced by reacting a monomer for introducing a branch unit into a molecule with a monomer for introducing a first functional group into a molecular terminal; and a second agent which has a second functional group reactable with the first functional group
Implementation Method 2
The remaining isocyanate compound reacts with water present in the surroundings to produce an amine compound and carbon dioxide gas
Data Source
AI summary
There are provided a two-component curable composition exhibiting the same curability and the like as usual even when the equivalent ratio of a reactive group of a second agent to a reactive group first agent is lower than usual, and a two-component adhesive, a two-component coating agent, and a laminate which use the two-component curable composition. The two-component curable composition contains a first agent which is produced by reacting a monomer for introducing a branch unit into a molecule with a monomer for introducing a first functional group into a molecular terminal; and a second agent which has a second functional group reactable with the first functional group, wherein the branching coefficient of the first agent is 1/f or more (f is the number of functional groups possessed by a monomer having the largest number of functional groups among monomers for introducing a branch unit into a molecule); and the agents are mixed and used at such a ratio that the equivalent ratio of the second functional group to the first functional group is excessive for the number of first functional groups.