Cyclic Carbonate Epoxy Binder for Low-Temperature Curing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Two-component polyurethane binder systems face challenges due to moisture sensitivity, formation of unwanted bubbles, and the toxicology of monomeric isocyanates, which lead to contamination and anti-sealing effects, especially in food packaging and laminated plastic films, requiring high curing temperatures for adequate adhesion.
Innovation Solution
A binder system comprising a resin component with cyclic carbonate and epoxy groups, combined with a hardener containing multifunctional amines, allowing complete curing at low temperatures (around 40°C) and providing good adhesion properties without the need for high temperatures or extensive safety measures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polyurethane binder systems based on NCO-terminated compounds are used, then good adhesive properties are achieved, but moisture sensitivity and formation of unwanted bubbles occur
Solution Approach 1:
The patent changes the chemical parameters of the binder system by replacing isocyanate groups with cyclic carbonate groups in the resin component. This fundamental chemical substitution eliminates the moisture sensitivity issue while maintaining adhesive performance, as cyclic carbonates do not react with moisture to form bubbles.
Solution Approach 2:
The invention creates a composite binder system combining cyclic carbonate-containing resin with epoxy resin and multifunctional amine hardener. This composite approach achieves both good adhesion and moisture resistance by leveraging the complementary properties of different chemical components.
2Strength
If monomeric isocyanates are used in the resin component, then adhesive performance is improved, but toxicology issues and migration problems occur
Solution Approach 1:
The patent extracts and eliminates the harmful monomeric isocyanate component from the binder system by replacing it with cyclic carbonate groups. This removal of the toxic substance is achieved through fundamental chemical substitution while maintaining the necessary adhesive functionality through the combined cyclic carbonate-epoxy-amine system.
Solution Approach 2:
The invention converts the potentially harmful isocyanate chemistry into beneficial cyclic carbonate chemistry that is non-toxic and non-migrating. The cyclic carbonate groups provide the necessary reactivity and adhesion without the harmful side effects, effectively turning a harmful chemical pathway into a safe one.
3Strength
If high curing temperatures are applied, then complete conversion and good adhesion are achieved, but energy consumption increases and application complexity increases
Solution Approach 1:
The patent changes the chemical reactivity parameters of the binder system by selecting components that react efficiently at low temperatures. The combination of cyclic carbonate groups, epoxy groups, and multifunctional amines provides high reactivity that enables complete conversion at around 40°C, eliminating the need for high-temperature curing.
Solution Approach 2:
The binder system is designed to be self-curing at low temperatures through the inherent reactivity of its components. The cyclic carbonate-epoxy-amine combination provides sufficient chemical driving force to achieve complete conversion without external energy input in the form of high heat, making the system self-sufficient at ambient or slightly elevated temperatures.
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 binder system achieves complete conversion and excellent adhesion at low temperatures, eliminating the need for high curing temperatures and reducing the risks associated with monomeric isocyanates, making it suitable for various applications including food packaging and laminated films.
Implementation Method 1
a binder system comprising a resin component and a hardener component, wherein the resin comprises at least one compound bearing at least two cyclic carbonate groups and at least one compound bearing at least two epoxy groups, and the hardener comprises at least one multifunctional amine
Data Source
AI summary
The present invention relates to a binder system that contains a resin component and a curing agent component, the resin comprising at least one compound having at least two cyclic carbonate groups and at least one compound having at least two epoxide groups, and the curing agent comprising at least one multifunctional amine, and the use of the binder system as an adhesive/sealant and the use of this adhesive/sealant.