Adhesion Promoter Stabilization for Abrasive Articles
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Solution Overview
Problem
Epoxy-silane coupling agents used in phenolic resin-bond abrasive articles deteriorate over time due to residual hydroxyl groups, leading to a decline in cutting performance and durability.
Innovation Solution
Capping hydroxyl groups with an isocyanatosilane compound to form a ring-opened adduct of polyepoxide, aminosilane, and isocyanatosilane, which stabilizes the adhesion promoter and enhances the bonding between abrasive particles and the binder material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If epoxy-silane coupling agent is used to modify abrasive particle surface, then adhesion between abrasive particles and binder is improved, but performance deteriorates over time due to residual hydroxyl groups
Solution Approach 1:
The patent extracts the problematic residual hydroxyl groups from the epoxy-silane coupling agent system by introducing isocyanatosilane that reacts with and removes these hydroxyl groups, thereby eliminating the source of performance deterioration while retaining the adhesion-promoting functionality
Solution Approach 2:
The isocyanatosilane acts as an intermediary substance that mediates between the epoxy-silane coupling agent and the abrasive particle surface, forming a stable intermediate structure that prevents hydroxyl group degradation while maintaining strong adhesion
2Productivity
If epoxy-silane coupling agent is used in phenolic resin-bond system, then initial cutting performance is improved, but durability declines after aging
Solution Approach 1:
The patent applies preliminary action by pre-reacting the epoxy-silane coupling agent with isocyanatosilane to cap hydroxyl groups before the aging process occurs, preventing the degradation mechanism from initiating in the first place
Solution Approach 2:
The patent changes the chemical parameters of the coupling agent system by introducing isocyanatosilane modification, which alters the molecular structure to eliminate hydroxyl groups and create a more stable chemical composition resistant to aging
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 significantly improves the durability and cutting performance of resin-bond abrasive articles by stabilizing the adhesion promoter and enhancing the anchoring of abrasive particles, maintaining performance over extended use.
Implementation Method 1
capping the hydroxyl groups with an isocyanatosilane compound, which both removes the hydroxyl group and introduces another hydrolyzable silane group
Implementation Method 2
each L independently represents a hydrolyzable group
Data Source
AI summary
An adhesion promoter comprises a reaction product of: a) a polyepoxide; b) an aminosilane represented by the formula HNR1R2. R1 and R2 independently represent —Z—SiL3. Each Z independently represents a divalent linking group having from 1 to 12 carbon atoms, and each L independently represents a hydrolyzable group; and c) an isocyanatosilane represented by the formula O═C═N—Z—SiL3, wherein Z and L are as previously defined. The adhesion promoter may be used to treat a surface of a substrate such as an abrasive particle, which may be included in a resin-bond abrasive article.