Fluorinated Lubricant Composition for Stable Sliding Torque
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Solution Overview
Problem
Fluorine grease used as a lubricant exhibits significant shear rate dependence of apparent viscosity, leading to variations in torque in sliding apparatuses, which can cause instability and performance issues.
Innovation Solution
A lubricant composition is developed using a perfluoropolyether as the base oil and fluorine resin particles as a thickener, with a fluorine-containing polymer having a tetrafluoroethylene structure dissolved in the base oil to reduce shear rate dependence of apparent viscosity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluorine grease is used as a lubricant, then low vapor pressure and suppressed evaporation are achieved, but significant shear rate dependence of apparent viscosity occurs
Solution Approach 1:
The invention uses a composite thickening system combining fluororesin particles (1-30 μm) and fluororesin fine particles (0.01-1 μm) with the perfluoropolyether base oil. This composite structure creates a network that resists shear-induced breakdown while maintaining stability across varying shear rates, resolving the contradiction between evaporation resistance and viscosity stability.
Solution Approach 2:
The invention introduces particles with specifically controlled size distribution and local concentration. The fine particles (0.01-1 μm) are distributed throughout the base oil to provide localized structural support, while coarser particles (1-30 μm) provide bulk thickening. This local quality differentiation maintains consistent apparent viscosity across different shear rates while preserving the low vapor pressure特性 of fluorine grease.
2Reliability
If fluorine grease with structural viscosity is used, then lubrication performance is improved, but torque variation occurs in sliding apparatus
Solution Approach 1:
The invention changes the physical parameters of the thickening system by controlling particle size distribution (bimodal distribution with 0.01-1 μm and 1-30 μm ranges) and particle concentration (0.1-10 mass%). This parameter optimization creates a lubricant that maintains stable apparent viscosity across the shear rate range encountered in sliding apparatus, thereby stabilizing torque while preserving lubrication performance.
Solution Approach 2:
The fluororesin particles create a porous-like network structure within the base oil that can accommodate shear deformation without collapsing. This structured network maintains consistent lubrication film properties and apparent viscosity across varying operating conditions, preventing torque variation while ensuring effective lubrication.
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 lubricant composition maintains consistent torque across a wide range of shear rates, reducing torque variations and enhancing the stability and performance of sliding, fixing, and image-forming apparatuses.
Implementation Method 1
a fluorine-containing polymer having a tetrafluoroethylene structure under a state in which the polymer is dissolved in the perfluoropolyether
Implementation Method 2
When the fluorine grease is used as a lubricant for an apparatus sliding portion
Data Source
Figure 1A~1B
Figure 2
AI summary
Provided is a lubricant composition having small shear rate dependence of its apparent viscosity. The lubricant composition includes a perfluoropolyether as a base oil, and fluorine resin particles as a thickener. The lubricant composition further includes a fluorine-containing polymer having a tetrafluoroethylene structure under a state in which the polymer is dissolved in the perfluoropolyether.