Room-Temperature Curable Polymer Composition With Moisture-Stable Elasticity
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Solution Overview
Problem
Existing reactive polymer compositions used as adhesives, sealants, or coatings face issues such as irritant effects, moisture sensitivity leading to premature crosslinking, bubble formation, incomplete polymerization, VOC emissions, and reduced durability, especially in high humidity conditions, and are often toxic or require special handling.
Innovation Solution
A curable composition comprising a first component with aldehyde groups and a second component with 1,3-ketoester groups, having molecular weights between 400 to 20,000 g/mol, which are non-toxic, moisture-insensitive, and can be mixed in varying ratios, allowing for high strength and extensibility without special precautions, and curing efficiently under ambient conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polyurethane systems are used for room temperature curable adhesives, then high elasticity is achieved, but moisture sensitivity causes premature crosslinking and reduced shelf life
Solution Approach 1:
The patent changes the chemical parameters by replacing isocyanate groups with aldehyde groups and polyol with 1,3-ketoester compounds. This fundamental parameter change eliminates moisture sensitivity while maintaining the ability to form elastic polymers through condensation reactions, thereby resolving the contradiction between elasticity and shelf life stability
Solution Approach 2:
The invention extracts and removes the problematic isocyanate groups from the system, eliminating their harmful moisture reactivity. By using aldehyde and 1,3-ketoester groups instead, the system achieves similar polymerization functionality without the adverse moisture sensitivity that causes premature crosslinking
2Productivity
If isocyanate groups are used in polyurethane systems, then polymerization occurs, but reaction with water causes bubble formation and incomplete polymerization
Solution Approach 1:
The patent changes the reactive functional groups from isocyanate to aldehyde and 1,3-ketoester combinations. These new groups undergo condensation reactions that do not produce gaseous byproducts, thereby eliminating bubble formation while maintaining effective polymerization and crosslinking capabilities
Solution Approach 2:
The invention converts the harmful water reactivity of isocyanate groups into a beneficial feature by using aldehyde and 1,3-ketoester groups that are moisture-insensitive. The water that would have caused problems now remains as part of the stable polymer matrix, improving rather than harming the final product
3Productivity
If silane-functional polymers are used for crosslinking, then curing occurs, but hydrolysis sensitivity leads to loss of catalytic activity and curing defects
Solution Approach 1:
The patent changes the crosslinking chemistry from silane hydrolysis to aldehyde-1,3-ketoester condensation. This parameter change eliminates hydrolysis sensitivity and the associated loss of catalytic activity, while maintaining effective crosslinking and curing capabilities through the new chemical mechanism
4Object-affected harmful factors
If water-based polymer systems are used, then low toxicity is achieved, but high shrinkage and water sensitivity reduce durability
Solution Approach 1:
The invention creates a composite material system combining aldehyde groups with 1,3-ketoester groups in a two-component formulation. This composite approach enables low toxicity like water-based systems while achieving the durability and dimensional stability of solvent-based systems through controlled condensation crosslinking that produces minimal shrinkage
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 provides a nontacky, elastic polymer with high strength and stability, enabling simple handling and reliable processing, with controlled curing rates and minimal emissions, suitable for a wide range of applications.
Implementation Method 1
They form crosslinks by condensation, with release of alcohol, in particular methanol or ethanol
Implementation Method 2
These polymer systems cure via hydrolysis and condensation of silane groups
Implementation Method 3
the water required for the curing must penetrate from the outside in the form of air humidity
Implementation Method 4
this can trigger bubble formation and cause incomplete polymerization with chain terminations
Implementation Method 5
They usually contain considerable amounts of monomeric diisocyanates that can exert an irritant effect on the eyes, skin and mucous membranes
Data Source
AI summary
A curable composition includes—a first component containing aldehyde group-containing compounds which include at least one compound with two or more aldehyde groups and—a second component containing 1,3 keto ester group-containing compounds which include at least one compound with two or more 1,3 keto ester groups of the formula (I), wherein the average molecular weight Mn of at least one of the two components, with respect to the aldehyde or 1,3 keto ester group-containing compounds, ranges from 400 to 20,000 g/mol. The composition is largely free of toxic ingredients and cures in ambient conditions using conventional catalysts quickly in order to form a non-tacky elastic polymer with a high degree of strength and elasticity. The composition is particularly suitable for use as an elastic adhesive, sealant, or coating with a high degree of robustness during production, storage, and processing as well as a high degree of resistance after curing.