PEEK Electrophotographic Belt Composition for Stable Conductivity
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Solution Overview
Problem
Existing electrophotographic belts experience increased conductivity and cracking over time due to high voltage discharge, leading to instability in forming high-quality images over long periods.
Innovation Solution
An electrophotographic belt with a base layer containing polyether ether ketone (PEEK) and carbon black, with a moisture content of 0.50% or more and a temperature-lowering crystallization temperature of 288.0°C or less, stabilizes conductivity and prevents cracking by consuming moisture for evaporation and electrolysis, maintaining insulation between carbon black particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If carbon black content is increased to improve conductivity, then electrical conductivity is improved, but cracking resistance decreases
Solution Approach 1:
The invention changes the physical and chemical parameters of the base layer by controlling moisture content (0.03-3.0 mass%) and crystallization temperature (288.0°C or lower). These parameter changes optimize the balance between conductivity and cracking resistance by affecting how carbon black particles interact and how the polymer matrix responds to electrical discharge, resolving the contradiction between needing high carbon black content for conductivity and avoiding excessive carbon black that causes cracking.
Solution Approach 2:
The invention creates a composite base layer combining PEEK or PPS polymer matrix with carbon black filler, where the specific composition ratio and moisture content create a synergistic effect. The composite structure allows the polymer matrix to protect carbon black particles from excessive aggregation while maintaining conductivity, and the controlled moisture content prevents carbonization that would lead to cracking.
2Reliability
If carbon black content is increased to ensure stable conductivity, then electrical conductivity is improved, but the belt experiences increased cracking over time
Solution Approach 1:
The invention applies beforehand cushioning by incorporating controlled moisture content (0.03-3.0 mass%) into the base layer before use. This moisture acts as a buffer that prevents excessive carbonization of the polymer matrix during electrical discharge events. By preparing this protective moisture reserve in advance, the invention cushions against the harmful effects of repeated high-voltage discharge that would otherwise cause cracking and reduce service life.
Solution Approach 2:
The invention changes the crystallization temperature parameter to 288.0°C or lower, which affects the molecular structure and flexibility of the polymer matrix. This parameter change makes the matrix more resistant to thermal stress and carbonization during electrical discharge, thereby preventing cracking and extending service life while maintaining stable conductivity over time.
3Reliability
If moisture content is increased to prevent conductivity changes, then conductivity stability is improved, but heat resistance decreases
Solution Approach 1:
The invention optimizes the moisture content parameter to a specific range (0.03-3.0 mass%) that provides sufficient protection against conductivity changes without excessive moisture that would significantly reduce heat resistance. This precise parameter control balances the conflicting requirements by finding the optimal moisture level that stabilizes conductivity while maintaining adequate thermal performance for electrophotographic application.
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 effectively suppresses conductivity changes and prevents cracking, ensuring stable high-quality image formation over time by controlling moisture content and crystallization temperature in the base layer.
Implementation Method 1
consuming moisture for evaporation and electrolysis
Implementation Method 2
consuming moisture for evaporation and electrolysis
Implementation Method 3
maintaining insulation between carbon black particles
Data Source
AI summary
An electrophotographic belt can suppress a decrease in electric resistance and a decrease in the crack resistance even when being repeatedly used for a long period of time. The electrophotographic belt including at least a base layer, wherein the base layer contains a polyether ether ketone resin, which is a thermoplastic resin, and carbon black, the content of the carbon black is 18 to 30 mass % with respect to the mass of the base layer, the base layer has a moisture content of at least 0.50 mass % as measured from a sample cut out from the base layer, and a crystallization temperature of the base layer during cooling is not higher than 288.0° C. that is measured in differential scanning calorimetry.