Curable Composition Stabilizers Temperature Stability
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Solution Overview
Problem
There is a need for curable compositions that offer excellent long-term temperature stability, elasticity, and adhesion properties without being toxic, suitable for use as adhesives, sealants, and coatings, particularly in applications like the solar industry where traditional compositions fall short in these aspects.
Innovation Solution
A curable composition comprising a polymer with specific phenolic compounds, including a polymer with end groups of the formula An-R—SiXYZ, a compound of the formula R1R2R3, and a compound of the formula R4R5R6, which together enhance temperature stability and adhesion, while being free from harmful substances and requiring no curing catalysts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional curable compositions are used to achieve adhesion and sealing properties, then basic functionality is provided, but long-term temperature stability deteriorates and toxicity increases
Solution Approach 1:
The patent changes the chemical composition parameters by using silane-terminated polymers with specific end groups (formula I) and combining them with phenolic compounds (formulas II and III) in controlled ratios. This parameter change enables the composition to cure at room temperature through moisture-induced siloxane bond formation, achieving excellent temperature stability without requiring toxic curing catalysts or high-energy processing conditions.
Solution Approach 2:
The invention creates a composite curable composition by combining multiple components: silane-terminated polymers (formula I), phenolic compounds with specific structures (formulas II and III), and optional additives. This composite approach leverages the synergistic effects of each component, where the silane groups provide crosslinking capability and temperature stability, while the phenolic compounds enhance adhesion and eliminate the need for toxic catalysts.
2Object-affected harmful factors
If silane-modified adhesives and sealants are used to eliminate isocyanate groups, then toxicity is reduced and adhesion broadens, but long-term temperature stability remains insufficient
Solution Approach 1:
The patent modifies the chemical structure parameters by incorporating phenolic compounds with specific molecular weights and structures (formulas II and III) into the silane-modified system. This structural parameter change enables the formation of a more thermally stable crosslinked network through siloxane bonds, raising the glass transition temperature and improving long-term temperature stability while maintaining the isocyanate-free advantage.
3Reliability
If crosslinking is enhanced to improve temperature resistance, then thermal stability improves, but elasticity and adhesion properties deteriorate
Solution Approach 1:
The patent applies local quality by creating a heterogeneous crosslinked structure where siloxane bonds form in specific regions providing thermal stability, while phenolic compound domains maintain flexibility and adhesion. The phenolic compounds act as local modifiers that prevent excessive crosslinking density, preserving elasticity and adhesion properties even as the overall network gains temperature resistance.
Solution Approach 2:
The invention uses a composite approach combining silane-terminated polymers for crosslinking with phenolic compounds that serve dual functions: enhancing adhesion and maintaining flexibility. This composite system achieves a balanced crosslink density that provides both temperature resistance and mechanical properties, avoiding the trade-off present in homogeneous highly-crosslinked systems.
Data Source
AI summary
The invention aims to improve temperature resistance for a curable composition based on a silyl-terminated polymer. This is achieved by using a combination of at least two phenolic compounds, of which one is free of thioether groups, while the other contains at least one thioether group in at least one alkyl side chain. The invention further relates to the use of the curable composition as an adhesive, sealant and/or coating substance and to the use of the combination of phenolic compounds to increase the temperature stability in curable compositions.