Aqueous Silane Coupling Agent Composition for High-Temperature Stability
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Solution Overview
Problem
Silane coupling agents in hydrolyzate form often contain high proportions of volatile organic solvents, leading to storage stability issues and difficulty in controlling hydrolytic condensation, especially when aiming for high solid content and low alcohol content in aqueous systems, which limits their environmental friendliness and effectiveness.
Innovation Solution
Aqueous silane coupling agent composition obtained from the cohydrolytic reaction of a succinic anhydride-containing silane coupling agent and a mercapto-containing silane coupling agent in a specific molar ratio, with subsequent removal of alcohol to reduce volatile organic compounds to up to 10% by weight, enhancing storage stability and reactivity under high-temperature conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If silane coupling agents are used in hydrolyzate form with high solid content in aqueous systems, then environmental friendliness is improved by reducing volatile organic solvents, but storage stability deteriorates and hydrolytic condensation becomes difficult to control
Solution Approach 1:
The patent changes the chemical structure parameters of silane coupling agents by introducing amino groups and carboxylic acid groups to enhance water solubility and aqueous solution stability. This allows the system to achieve high solid content (5-50 wt%) while maintaining storage stability and controlling hydrolytic condensation, thereby reducing volatile organic solvent content to below 10 wt% without sacrificing reliability
Solution Approach 2:
The patent creates a composite aqueous system combining multiple silane coupling agents with different functional groups (amino, carboxylic acid, mercapto) to achieve synergistic effects. This composite approach enables the system to simultaneously improve environmental friendliness by reducing volatile organic solvents while maintaining storage stability through the complementary properties of different silane components
2Object-generated harmful factors
If the concentration of mercapto-containing silane coupling agent is increased to reduce alcohol content, then environmental friendliness is improved, but water solubility and storage stability deteriorate due to high hydrophobicity
Solution Approach 1:
The patent merges mercapto-containing silane coupling agents with amino-containing and carboxylic acid-containing silane coupling agents in specific ratios. This combination allows the system to achieve high concentration of mercapto groups (reducing alcohol content) while the amino and carboxylic acid groups provide water solubility and storage stability, resolving the contradiction between environmental friendliness and compositional stability
3Stability of the object's composition
If amino-containing silane coupling agents are used to improve water solubility and aqueous solution stability, then environmental friendliness is improved, but the system may still contain volatile organic compounds from hydrolysis
Solution Approach 1:
The patent optimizes the chemical composition parameters by selecting silane coupling agents with specific functional groups and adjusting their ratios. The amino-containing silane provides water solubility and aqueous solution stability, while the co-presence of carboxylic acid-containing and mercapto-containing silanes enhances overall stability and reduces volatile organic compound generation during storage and application, achieving both improved aqueous solution stability and reduced environmental harm
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 resulting composition exhibits improved storage stability, high water solubility, and strong reactivity with inorganic materials, minimizing environmental impact by eliminating volatile organic compounds and ensuring effective bonding with inorganic materials.
Implementation Method 1
aqueous silane coupling agent composition obtained from cohydrolytic reaction of a succinic anhydride-containing silane coupling agent and a mercapto-containing silane coupling agent
Data Source
AI summary
An aqueous silane coupling agent composition is obtained from cohydrolytic reaction of (i) a succinic anhydride-containing silane coupling agent and (ii) a mercapto-containing silane coupling agent in a molar ratio of 99:1 to 1:1. The composition has improved storage stability under high-temperature conditions and is effective as modifier.