Resin Composition Scratch Resistance via Silane Composite
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Solution Overview
Problem
Existing resin compositions containing organopolysiloxanes with glycidyloxy groups have a long pot life but do not provide sufficient scratch resistance in the cured product.
Innovation Solution
A resin composition is developed by blending a triarylalkoxysilane, a diaryldialkoxysilane, or their hydrolysates with an organopolysiloxane having a glycidyloxy group, along with a β-dicarbonyl compound and an organic compound with epoxy, oxetanyl, or vinyl ether groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If an organopolysiloxane having a glycidyloxy group is used, then the pot life is extended, but the scratch resistance of the cured product is insufficient
Solution Approach 1:
The patent combines an organopolysiloxane having a glycidyloxy group with a silane compound having an epoxy group to create a composite resin composition. This composite approach allows the system to maintain the long pot life provided by the glycidyloxy group while achieving sufficient scratch resistance through the epoxy group-containing silane compound after curing with the curing agent
2Productivity
If an acid catalyst or base catalyst is used for hydrolysis and dehydration condensation of alkoxysilane with epoxy group, then the condensation reaction is accelerated, but the epoxy group is deactivated or gelling occurs
Solution Approach 1:
The patent employs a neutral salt as an intermediary catalyst that facilitates the hydrolysis and dehydration condensation of the alkoxysilane without deactivating the epoxy group or causing premature gelling. This neutral salt mediator enables the condensation reaction to proceed while preserving the epoxy group's reactivity for subsequent curing
Solution Approach 2:
The patent changes the catalyst type from acidic or basic to neutral, fundamentally altering the reaction conditions. This parameter change allows the condensation reaction to proceed at an acceptable rate while maintaining the epoxy group's activity, avoiding deactivation and premature gelling issues
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 cured product exhibits excellent scratch resistance, hot water resistance, chemical resistance, and adhesion to a base material, while maintaining a sufficient pot life.
Implementation Method 1
subjecting an alkoxysilane having an organic group to hydrolysis and dehydration condensation in the presence of an acid catalyst or a base catalyst
Implementation Method 2
subjecting an alkoxysilane having an organic group to hydrolysis and dehydration condensation in the presence of an acid catalyst or a base catalyst
Implementation Method 3
a curing agent (e.g. an amine curing agent) which cures the epoxy group
Data Source
AI summary
A resin composition containing (A) an organopolysiloxane having a glycidyloxy group, and (B) at least one selected from the group consisting of a triarylalkoxysilane, a diaryldialkoxysilane, a hydrolysate thereof and a partially hydrolyzed/condensed product thereof is provided. The resin composition may further contain (C) a β-dicarbonyl compound. The resin composition may further contain (D) an organic compound having one or more of an epoxy group, an oxetanyl group and a vinyl ether group. The resin composition may be mixed with (E) an organoaluminum compound and/or organotitanium compound and be cured.