Novel Sulfonium Borate Complex for Low-Temperature Curing
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Solution Overview
Problem
Conventional sulfonium borate complexes used as thermal cationic polymerization initiators for epoxy resin compositions do not adequately reduce fluorine ion generation during thermal cationic polymerization, leading to insufficient low-temperature fast curing properties and electrolytic corrosion resistance in thermal cationic polymerizable adhesives.
Innovation Solution
A novel sulfonium borate complex with specific substituents, such as a benzyl, methyl, and methoxycarbonyl groups, is introduced, which is synthesized by reacting a sulfonium antimonate complex with a sodium borate salt, reducing fluorine ion generation and enhancing curing properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a sulfonium borate complex is used as a thermal cationic polymerization initiator, then fluorine ion generation is reduced to some extent, but low-temperature fast curing properties are still insufficient
Solution Approach 1:
The patent applies parameter changes by modifying the chemical structure of the sulfonium borate complex through specific substituent combinations (R1-benzyl, R2-methyl, R3-methoxycarbonyl groups with specific positioning) to optimize both fluorine ion reduction and low-temperature curing performance simultaneously
Solution Approach 2:
The patent creates a composite initiator system by combining multiple specific substituents (benzyl, methyl, methoxycarbonyl groups) in a specific configuration within the sulfonium borate complex to achieve synergistic effects that resolve the contradiction between fluorine ion reduction and curing performance
2Reliability
If a sulfonium antimonate complex is used as a photocationic polymerization initiator, then light-induced polymerization is effective, but fluorine ions are generated during thermal cationic polymerization causing electrolytic corrosion
Solution Approach 1:
The patent extracts the problematic antimonate component and replaces it with a borate complex having specific substituents, removing the source of excessive fluorine ion generation while maintaining initiator functionality
Solution Approach 2:
The patent uses a sulfonium borate complex that is designed to be consumed in the polymerization reaction without generating harmful byproducts, replacing the persistent antimonate complex that causes ongoing fluorine ion release and corrosion
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 novel sulfonium borate complex significantly reduces fluorine ion generation, improving electrolytic corrosion resistance and providing low-temperature fast curing properties in epoxy resin compositions, making it suitable for thermal cationic polymerizable adhesives.
Implementation Method 1
a thermal cationic polymerization initiator that initiates cationic polymerization by generating protons via light
Implementation Method 2
a novel sulfonium borate complex with specific substituents, such as a benzyl, methyl, and methoxycarbonyl groups
Data Source
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AI summary
A novel sulfonium borate complex that is capable of reducing the amount of fluorine ions generated during thermal cationic polymerization, and is capable of providing a thermal cationic polymerizable adhesive with low-temperature fast curing properties is represented by a structure represented by the formula (1). In the formula (1), R1 is an aralkyl group, R2 is a lower alkyl group, and R3 is a lower alkoxycarbonyl group. X is a halogen atom, and n is an integer of from 1 to 3.