Silicone Rubber Elastic Layer with Bound Rubber Interface
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Solution Overview
Problem
The existing electrophotographic members with high thermal conductivity and low thermal capacity face durability issues due to increased metallic silicon particles, which concentrate stress at the particle-rubber interface, leading to deformation and breakage.
Innovation Solution
The formation of 'bound rubber' on the surface of metallic silicon particles enhances the interface strength between the particles and the silicone rubber matrix, achieved through a specific extraction and curing process involving organopolysiloxane and metallic silicon powder, with a mass reduction rate of 0.05% or more, ensuring excellent durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a silicone rubber composition containing a larger amount of metallic silicon particles is employed to form the elastic layer, then thermal conductivity is improved, but durability decreases
Solution Approach 1:
The invention changes the chemical parameter of the silicone rubber by specifying precise compositional ratios (metallic silicon particles 30-70 wt%, organopolysiloxane with vinyl groups 10-40 wt%, organopolysiloxane with Si-H bonds 5-30 wt%) to optimize both thermal conductivity and durability. This parameter optimization resolves the contradiction by finding the precise compositional balance point where high metallic silicon content for thermal conductivity does not compromise durability
Solution Approach 2:
The invention creates a composite elastic layer material combining metallic silicon particles with specifically formulated organopolysiloxanes containing vinyl groups and Si-H bonds. This composite structure achieves high thermal conductivity from the metallic silicon while the polysiloxane matrix provides durability through controlled crosslinking, resolving the contradiction between thermal performance and mechanical strength
2Temperature
If a larger amount of metallic silicon particles is added to the silicone rubber, then thermal capacity is reduced, but the interface strength between particles and rubber decreases
Solution Approach 1:
The invention uses organopolysiloxanes with vinyl groups and Si-H bonds as intermediary materials that chemically bond to the metallic silicon particle surfaces. These intermediary polysiloxanes create strong chemical bonds at the particle-rubber interface, maintaining interface strength even when metallic silicon content is increased to reduce thermal capacity
Solution Approach 2:
The invention optimizes the compositional parameters by controlling the ratios of metallic silicon particles (30-70 wt%), vinyl-containing organopolysiloxane (10-40 wt%), and Si-H containing organopolysiloxane (5-30 wt%). This parameter control ensures sufficient interface strength through chemical bonding while achieving the desired thermal capacity reduction
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 enhanced interface strength increases the rupture energy of the elastic layer, providing excellent durability and maintaining high thermal conductivity and low thermal capacity, thus stabilizing the electrophotographic image forming process.
Implementation Method 1
the elastic layer is required to have high thermal conductivity and low thermal capacity
Implementation Method 2
applying an ultrasonic wave of 40 kHz for 60 minutes to dissolve the silicone rubber of the sample
Implementation Method 3
The formation of 'bound rubber' on the surface of metallic silicon particles enhances the interface strength between the particles and the silicone rubber matrix
Data Source
AI summary
An electrophotographic member comprising a base body and an elastic layer on the base body, the elastic layer including silicone rubber and metallic silicon particles in the silicone rubber; wherein the metallic silicon particles have a mass reduction rate of 0.05% or more.