Stabilizer Composition for Silyl-Terminated Polymers
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Solution Overview
Problem
Current sealant, adhesive, and coating compositions face challenges with long-term temperature resistance, UV resistance, and oxidation resistance, as well as issues with compatibility and miscibility of antioxidants and sterically hindered amines, leading to degradation and exudation problems.
Innovation Solution
A stabilizer composition combining sterically hindered amines with basicity-reducing substituents, antioxidants with thioether groups, and liquid plasticizers with carboxylic acid ester groups is used to enhance the stability of silyl-terminated polymers, preventing degradation by heat, light, and oxygen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If phenolic antioxidants containing thioether groups are used to improve temperature stability, then oxidation resistance is improved, but compatibility with sterically hindered amines deteriorates due to deactivation by sulfonic acids
Solution Approach 1:
The patent introduces a specific plasticizer as an intermediary substance that mediates between the thioether-containing antioxidant and the sterically hindered amine. This plasticizer prevents the deactivating interaction between sulfonic acids and HALS by acting as a buffer or barrier, allowing both components to coexist without mutual deactivation while maintaining their individual stabilizing functions.
Solution Approach 2:
The patent modifies the chemical parameters of the stabilizer system by selecting specific types of sterically hindered amines and antioxidants with particular structural characteristics. By changing the molecular structure and chemical properties of the components, the patent achieves compatibility between thioether antioxidants and HALS, resolving the deactivation issue through parameter optimization rather than avoiding the interaction entirely.
2Temperature
If phenolic antioxidants with thioether groups are used to enhance temperature stability, then long-term temperature resistance is improved, but miscibility in cured polymers deteriorates leading to exudation and blooming
Solution Approach 1:
The plasticizer serves as a mediating substance that improves the miscibility of polar thioether-containing antioxidants in the apolar cured polymer matrix. By introducing this intermediary component, the patent enables better distribution and compatibility of the antioxidant throughout the polymer, preventing phase separation, exudation, and blooming while maintaining the temperature stability benefits.
Solution Approach 2:
The patent changes the physical and chemical parameters of the antioxidant system by using specific phenolic antioxidants with thioether groups that have optimized molecular characteristics. These parameter changes enable better compatibility with the cured polymer matrix, preventing miscibility issues and exudation while maintaining temperature resistance.
3Object-affected harmful factors
If conventional stabilizer compositions are used to protect against UV and heat degradation, then some stabilization is achieved, but long-term temperature and UV resistance deteriorates due to incompatibility and exudation
Solution Approach 1:
The patent creates a composite stabilizer system that combines multiple components (sterically hindered amines, phenolic antioxidants with thioether groups, and specific plasticizers) in a synergistic formulation. This composite approach allows the system to provide comprehensive protection against UV, heat, and oxidation while the plasticizer ensures compatibility and prevents exudation, achieving long-term reliability that individual components cannot provide alone.
Solution Approach 2:
The plasticizer acts as a mediating component that enables the effective combination of UV stabilizers and antioxidants in the formulation. By preventing incompatibility issues and exudation, the plasticizer ensures that the stabilizer system maintains its protective function over the long term, improving reliability without sacrificing protection against harmful factors.
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 solution effectively stabilizes silyl-terminated polymers against heat, light, and oxygen degradation, improving the long-term performance and preventing exudation in sealant, adhesive, and coating compositions.
Implementation Method 1
at least one light stabilizer selected from sterically hindered amines (HALS) in which the amino group carries a basicity-reducing substituent
Implementation Method 2
at least one antioxidant containing one or more thioether groups
Implementation Method 3
STPs with hydrolyzable substituents, such as alkoxy groups, are capable of condensing with one another yet at room temperature; resulting thus in cured or crosslinked polymers
Data Source
AI summary
The present invention relates to a stabilizer composition containing at least one sterically hindered amine(HALS) in which the amino group carries a basicity-reducing substituent, at least one antioxidant containing one or more thioether groups and at least one liquid plasticizer containing carboxylate groups. The invention further relates to a polymer composition containing at least one sterically hindered amine (HALS) in which the amino group carries a basicity-reducing substituent, at least one antioxidant containing one or more thioether groups, at least one liquid plasticizer containing carboxylate groups and at least one silyl-terminated polymer, to the use of the stabilizer composition for stabilizing a silyl-terminated polymer or a sealant, adhesive, gasket, knifing filler or coating composition, especially a sealant, adhesive, gasket, knifing filler or coating composition containing a silyl-terminated polymer, against degradation by heat, light and/or oxygen, to the use of the polymer composition as or in a sealant, adhesive, liquid gasket, knifing filler or coating composition, and to a sealant composition or an adhesive composition, or a gasket composition, or a knifing filler composition or a coating composition comprising the polymer composition.