Hydroxy-Carboxy Resin Composition for Low-Temperature Crosslinking
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Solution Overview
Problem
Polycarbodiimide and polyoxazoline compounds exhibit low crosslinking reactivity to resins with alcoholic hydroxy and carboxy groups, requiring high temperatures that can cause discoloration or thermal decomposition.
Innovation Solution
Combining a polycarbodiimide or polyoxazoline compound with a specific organometallic compound improves crosslinking reactivity, allowing reactions to occur at lower temperatures without discoloration or thermal decomposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polycarbodiimide compound or polyoxazoline compound is used as a crosslinking agent with a resin having an alcoholic hydroxy group, then crosslinking can be achieved, but the crosslinking reactivity is low and high temperature is required which causes discoloration or thermal decomposition
Solution Approach 1:
The patent introduces an organometallic compound as a catalyst intermediary to facilitate the crosslinking reaction between the polycarbodiimide/polyoxazoline compound and the resin's hydroxy or carboxy groups. This catalyst enables the reaction to proceed at lower temperatures, preventing discoloration and thermal decomposition while maintaining crosslinking reactivity
Solution Approach 2:
The patent changes the reaction temperature parameter from high temperature (conventional method) to low temperature (with catalyst). By adjusting this critical parameter and introducing the organometallic compound catalyst, the crosslinking reaction achieves sufficient reactivity without causing harmful thermal effects on the resin
2Strength
If the reaction temperature is increased to improve crosslinking reactivity, then the crosslinking strength increases, but the resin undergoes discoloration or thermal decomposition
Solution Approach 1:
The organometallic compound acts as a catalyst intermediary that enables the crosslinking reaction to achieve high crosslinking strength at lower temperatures. The catalyst facilitates the chemical reaction pathway, allowing sufficient crosslinking without requiring high temperature that would cause discoloration or decomposition
Solution Approach 2:
The patent changes the temperature parameter from high to low by introducing the catalyst. This parameter change allows the system to achieve the same crosslinking strength through a different thermal regime, avoiding the harmful effects associated with high temperature processing
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 resin composition achieves high crosslinking strength and stability at lower reaction temperatures, suitable for various applications including paints, inks, adhesives, and molded products.
Implementation Method 1
the crosslinking reactivity of a polycarbodiimide compound to an alcoholic hydroxy group or a carboxy group is improved by combinedly using a specific organometallic compound
Implementation Method 2
a resin having an alcoholic hydroxy group or a carboxy group as a crosslinkable group and a resin crosslinked body that is a reaction product of the resin composition
Data Source
AI summary
A resin composition including a resin having an alcoholic hydroxy group and/or a carboxy group as a crosslinkable group, which exhibits excellent crosslinking reactivity to a polycarbodiimide compound and a polyoxazoline compound even at a low reaction temperature where the resin does not cause discoloration or thermal decomposition; a resin material including the resin composition; and a resin crosslinked body that is a reaction product of the resin composition are provided. The resin composition includes at least one resin (A) containing at least an alcoholic hydroxy group and a carboxy group; at least one crosslinking agent (B) selected from a polycarbodiimide compound and a polyoxazoline compound; and a specific organometallic compound (C). The resin material including the resin composition and the resin crosslinked body are provided.