Conductive Member Surface Layer Polyphenol Hardening
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Solution Overview
Problem
The prolonged lifetime of electrophotographic machines increases electrical and physical loads on conductive members, leading to hardening degradation of the surface layer caused by ions in the ionic conductive agent in the conductive rubber elastic body layer, resulting in cracks and reduced durability.
Innovation Solution
A conductive member for electrophotographic machines featuring a cross-linked rubber elastic body layer with an ionic conductive agent and a surface layer containing polyphenol, such as tannin or gallic acid, to prevent hardening degradation and enhance durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an ionic conductive agent is contained in the conductive rubber elastic body layer to achieve uniform conductivity, then conductivity is improved, but the ions transfer to the surface layer causing hardening degradation and cracks
Solution Approach 1:
A barrier layer is introduced between the conductive rubber elastic body layer containing the ionic conductive agent and the surface layer. This barrier layer prevents the transfer of ions from the conductive layer to the surface layer, thereby stopping the hardening degradation and crack formation while maintaining the conductivity benefits of the ionic conductive agent.
Solution Approach 2:
The conductive member is divided into distinct functional layers: a conductive rubber elastic body layer for conductivity, a barrier layer to prevent ion migration, and a surface layer for durability. This segmentation allows each layer to perform its specific function without interfering negatively with other layers.
2Duration of action of stationary object
If the lifetime of electrophotographic machines is prolonged, then machine durability is improved, but electrical and physical loads on conductive members increase causing surface layer hardening and cracks
Solution Approach 1:
The barrier layer is pre-installed between the conductive layer and surface layer to cushion against the harmful effects of ion migration. This protective structure is in place before the degradation process begins, preventing the transfer of ions that would cause hardening and cracking under prolonged electrical and physical loads.
3Strength
If the surface layer is made more durable to resist degradation, then surface durability is improved, but the underlying conductive layer still causes ion transfer and hardening
Solution Approach 1:
The barrier layer serves as an intermediary that blocks the harmful ion transfer from the conductive rubber elastic body layer to the surface layer. This allows the surface layer to maintain its durability without being compromised by ion migration from the conductive layer.
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 surface layer with polyphenol effectively prevents degradation caused by oxidizing substances, improving durability even under increased loads, thereby extending the lifespan of electrophotographic machine components.
Implementation Method 1
the surface layer contains polyphenol... prevents degradation caused by oxidizing substances
Data Source
AI summary
To provide a conductive member for an electrophotographic machine that is capable of preventing hardening degradation of a surface layer that is caused by an ionic conductive agent contained in a conductive rubber elastic body layer, allowing the surface layer to be improved in durability.A conductive member 10 for an electrophotographic machine includes a conductive rubber elastic body layer 14 containing crosslinked rubber and an ionic conductive agent, and a surface layer 16 provided on an outer periphery of the conductive rubber elastic body layer 14, wherein the surface layer 16 contains a polymer and polyphenol. Examples of the polyphenol include a tannin, gallic acid, ellagic acid, pyrogallol, catechin, and chlorogenic acid.