Neutral Salt Catalyzed Epoxysilane Condensation for Low Shrinkage Resins
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Solution Overview
Problem
Conventional methods for accelerating the hydrolysis and condensation of silane compounds using acid or base catalysts can lead to deactivation of epoxy groups and corrosion issues, while the use of fluoride salts as catalysts poses safety concerns and does not effectively address the problem of gelatinization and impurity formation.
Innovation Solution
A curable composition is developed using a neutral salt as a catalyst for the hydrolysis and condensation of epoxysilane compounds, which accelerates the reaction without using acid or base catalysts, resulting in a condensation product with a high epoxy group residual ratio, high abrasion resistance, and low cure shrinkage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If an acid catalyst or base catalyst is used to accelerate hydrolysis and condensation of silane compounds, then the reaction speed is improved, but the epoxy groups are deactivated and gelatinization occurs
Solution Approach 1:
The patent changes the chemical parameter of the catalyst from acidic/basic to neutral (pH 6.5-7.5), which prevents epoxy group deactivation while maintaining acceptable reaction speed. This parameter change resolves the contradiction by finding a middle ground that satisfies both productivity and reliability requirements.
Solution Approach 2:
The patent introduces water as an intermediary substance to facilitate the hydrolysis and condensation reaction without requiring strong acid or base catalysts. By controlling the amount and addition rate of water, the reaction proceeds at a reasonable speed while preserving epoxy group integrity.
2Productivity
If an acid catalyst or base catalyst is used, then the hydrolysis and condensation are accelerated, but corrosion of reactor and storage equipment occurs
Solution Approach 1:
The patent changes the pH parameter from strongly acidic or basic conditions to neutral conditions (pH 6.5-7.5), which eliminates corrosion of equipment while maintaining reaction efficiency through controlled water addition and neutral salt catalysts.
Solution Approach 2:
The patent converts the potentially harmful effect of requiring strong catalysts into a benefit by using neutral conditions. The controlled water addition method allows the reaction to proceed efficiently without the harmful side effects of acid/base corrosion, turning a limitation into an advantage.
3Object-affected harmful factors
If neutralization is carried out to remove acid or base, then the harmful effects are reduced, but the process becomes complicated and impurities increase
Solution Approach 1:
The patent extracts the need for neutralization steps entirely by designing a process that uses neutral conditions from the start. By eliminating acid/base catalysts and using controlled water addition with neutral salts, the harmful effects are removed without requiring additional neutralization processes, thus avoiding increased complexity and impurities.
4Reliability
If no catalyst is used, then the epoxy groups remain stable, but the hydrolysis and condensation proceed slowly requiring long reaction time
Solution Approach 1:
The patent applies continuous controlled water addition to maintain a steady state of hydrolysis and condensation reaction. This continuous supply of water ensures the reaction proceeds at a reasonable rate without requiring strong catalysts that would harm the epoxy groups, thus balancing stability with acceptable reaction time.
Solution Approach 2:
The patent optimizes temperature parameters (50-200°C range) to compensate for the absence of strong catalysts. By controlling temperature and water addition rate, the reaction achieves practical speed while maintaining epoxy group stability through neutral conditions.
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 achieves a cured product with high epoxy group residual ratio, high chemical resistance, and low cure shrinkage, providing improved hardness and abrasion resistance without the drawbacks of traditional catalysts.
Implementation Method 1
hydrolysis and condensation of epoxysilane compounds
Implementation Method 2
condensation reaction of silane compounds having a hydrolyzable silyl group
Implementation Method 3
using a neutral salt as a catalyst for the hydrolysis and condensation
Implementation Method 4
mixing a curing agent (B) which cures an epoxy group
Data Source
AI summary
A condensation product having a high epoxy group residual ratio is obtained by accelerating, with use of neither an acid catalyst nor a base catalyst, hydrolysis and condensation reaction of a silyl group in a silane compound containing an epoxy structure-containing group. Then, a cured product is formed, which has high abrasion resistance, high chemical resistance and low cure shrinkage. The condensation product is synthesized from silane compounds at a specific ratio in the presence of a neutral salt catalyst, which silane compounds are represented by General Formula (I) and General Formula (II), respectively, and then cured with use of a curing agent which cures an epoxy group.