Surface-Modified Abrasive Particles with Epoxy Silane Coupling Agents
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Solution Overview
Problem
Existing resin bond abrasive articles, such as cut-off wheels, experience significant degradation in abrading performance and durability, particularly when used with water or in humid environments, leading to reduced cutting rates and increased maintenance needs.
Innovation Solution
The use of epoxy-functional coupling agents, specifically a reaction product of polyepoxide and aminosilane, is applied to the surface of abrasive particles to enhance their bonding with organic binder materials, creating a surface-modifying layer that improves adhesion and durability in abrasive articles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional resin bond abrasive articles are used, then initial cutting performance is achieved, but abrading performance degrades significantly during use especially in wet or humid conditions
Solution Approach 1:
The patent introduces a silane coupling agent as an intermediary substance that chemically bonds to both the abrasive particle surface (containing hydroxyl groups) and the organic binder material. This coupling agent acts as a mediator that creates strong interfacial adhesion between the abrasive particles and binder, preventing particle detachment during wet or humid operation, thereby maintaining consistent abrading performance throughout the service life of the abrasive article
Solution Approach 2:
The patent modifies the chemical parameters of the abrasive particle surface by applying a silane coupling agent treatment. This changes the surface chemistry from hydroxyl groups to silane-modified surface groups that have enhanced compatibility and bonding affinity with organic binder materials. This parameter change in surface chemistry enables the abrasive particles to maintain strong bonding under wet or humid conditions, resolving the performance degradation issue
2Strength
If abrasive particles are treated with epoxy-functional silane coupling agents, then adhesion and durability are improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies silane coupling agent treatment to the abrasive particles as a preliminary action before mixing with the organic binder material. This pre-treatment prepares the abrasive particle surfaces with enhanced bonding characteristics, so that when the particles are subsequently mixed and cured with the binder, strong adhesion is automatically achieved. This preliminary action simplifies the overall manufacturing process by eliminating the need for complex surface treatment equipment during final assembly
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 treated abrasive particles in resin bond abrasive articles exhibit significantly reduced degradation and improved abrading performance, maintaining cutting efficiency and durability even under wet conditions or in humid environments, resulting in longer service life and reduced maintenance.
Implementation Method 1
the surfacemodifying layer comprises a reaction product of an epoxy-functional coupling agent and hydroxyl groups covalently bound to the outer surface of the abrasive particle
Implementation Method 2
hydroxyl groups covalently bound to the outer surface of the abrasive particle, wherein the epoxy-functional coupling agent comprises a reaction product of: a polyepoxide; and an aminosilane
Data Source
Figure 1~2
AI summary
An epoxy-functional coupling agent comprises a reaction product of a polyepoxide and an aminosilane represented by the formula HNR1R2. R1 represents Z-SiL3 and R2 represents Z-SiL3 or an alkyl group having from 1 to 4 carbon atoms. Each Z independently represents a divalent linking group having from 1 to 18 carbon atoms, and each L independently represents a hydrolyzable group. The coupling agent may be used to treat a substrate such as an abrasive particle, which may be included in a resin bond abrasive article.