Epoxy Resin System with Latent Functionality for Anti-Sulfur Corrosion
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Solution Overview
Problem
Conventional anti-sulfur resistors (ASRs) face issues with corrosion due to sulfur components in the air, as the protection layers fail to bond effectively with the epoxy overcoat or platings, leading to peeling and exposure of silver termination layers to corrosive gases, which can cause electrical failures.
Innovation Solution
An epoxy-based resin system composition with a latent functionality for polymer adhesion improvement is used to create a robust protection layer and overcoat layer in ASRs, incorporating epoxy-based resins, hardeners, and optional blowing agents and filler materials, which react at specific temperatures or with UV light to enhance chemical and mechanical bonding, preventing peeling and exposure to corrosive gases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional protection layers are used in anti-sulfur resistors, then the structure is simple and manufacturing is easy, but the adhesion between protection layer and epoxy overcoat/platings is poor, leading to peeling and corrosion
Solution Approach 1:
The patent employs a composite resin system comprising epoxy-based resin, hardener, and silane coupling agent. This composite formulation creates multiple bonding mechanisms: covalent bonds from epoxy-hardener reaction, and additional silane-based chemical bonds that enhance adhesion to metal substrates and overcoat layers, thereby resolving the adhesion problem without excessive complexity
Solution Approach 2:
The silane coupling agent acts as an intermediary substance between the epoxy-based resin system and the metal substrate/overcoat layers. It forms a bridging layer that chemically bonds to both surfaces, preventing peeling and improving interfacial adhesion, thus resolving the contradiction between simple structure and strong bonding
2Object-affected harmful factors
If conventional epoxy resins are used, then the formulation is simple, but the resistance to sulfur-related corrosion is insufficient due to layer peeling
Solution Approach 1:
The patent creates a composite protective coating system that combines epoxy-based resin for baseline corrosion protection with silane coupling agents for enhanced interfacial bonding. This composite approach prevents the peeling that would otherwise expose metal surfaces to sulfur corrosion, thereby improving corrosion resistance through material composition rather than simple thickness increase
Solution Approach 2:
The patent modifies the chemical parameters of the epoxy resin system by incorporating silane functional groups. This chemical parameter change enables the resin to form additional types of chemical bonds (siloxane and silane crosslinks) with the substrate and overcoat, creating a more robust protective system against sulfur corrosion while maintaining formulation manageability
3Reliability
If the protection layer is applied without latent functionality, then the manufacturing process is simple, but the adhesion improves only at high temperature, requiring additional curing steps
Solution Approach 1:
The patent incorporates silane coupling agents that undergo condensation reactions at relatively low temperatures (typically Room temperature to 80°C), transforming the resin system from requiring high-temperature curing to enabling low-temperature adhesion improvement. This parameter change in reaction temperature activates latent functionality without sacrificing manufacturing efficiency
Solution Approach 2:
The silane coupling agent is pre-incorporated into the epoxy resin formulation before application. This preliminary inclusion ensures that the adhesion-enhancing functionality is already present in the coating, ready to activate during the standard curing process, thereby improving adhesion without requiring separate additional curing steps
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 improved ASRs exhibit enhanced adhesion and resistance to sulfur-related corrosion, preventing peeling of protection layers and maintaining the integrity of silver termination layers, thus reducing electronic component failures in harsh environments.
Implementation Method 1
An epoxide functionality of at least one of the one or more epoxy-based resins and a reactive functionality of at least one of the one or more hardeners react with each other at a first temperature
Implementation Method 2
The latent functionality, which does not react at the first temperature, is contained in at least one of the one or more epoxy-based resins, the one or more hardeners and the one or more filler materials and reacts in response to another stimulus (e.g., UV light in conjunction with a UV initiator, such as an onium salt, and/or a second temperature greater than the first temperature) to enhance chemical bonding
Implementation Method 3
Optionally, voids created via etching and/or the one or more blowing agents may be used to enhance mechanical bonding
Data Source
AI summary
An epoxy-based resin system composition includes a latent functionality for polymer adhesion improvement. The composition may be used to produce an overcoat layer and/or protection layer in an anti-sulfur resistor (ASR). In some embodiments, the composition include epoxy-based resin(s), hardener(s) and, optionally, blowing agent(s) and/or filler(s). An epoxide functionality of one or more of the epoxy-based resin(s) and a reactive functionality of one or more of the hardener(s) react with each other at a first temperature. The latent functionality, which does not react at the first temperature, is contained in at least one of the epoxy-based resin(s), hardener(s) and filler(s) and reacts in response to another stimulus (e.g., UV light/initiator and/or a second temperature greater than the first temperature) to enhance chemical bonding. Optionally, voids created via etching and/or the blowing agent(s) may be used to enhance mechanical bonding, alone, or in combination with filler(s) exposed in the voids.