Lithium Complex Grease for Clean Robot Motion Guides
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Solution Overview
Problem
Conventional grease compositions for clean environments face challenges in balancing low dust emission and high load bearing capacity, particularly in large-scale clean robots, where existing solutions either compromise on dust emission or load bearing capacity.
Innovation Solution
A grease composition with a kinematic viscosity of 100 to 300 mm^2/s at 40°C, incorporating a lithium complex soap as a thickener at 17 to 40 mass%, and featuring at least 50% hydrocarbon-type synthetic oil, along with extreme-pressure agents like molybdenum dithiocarbamates or zinc dithiophosphates, to achieve both low dust emission and high load bearing capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If fluorinated grease with PFPE base oil and PTFE thickener is used, then dust emission is reduced, but production cost increases and load bearing capacity is insufficient
Solution Approach 1:
The patent replaces expensive fluorinated base oils (PFPE) with cheaper hydrocarbon-based synthetic oils while maintaining low dust emission performance through optimized thickener composition (lithium 12-hydroxystearate and lithium stearate in specific ratios) and additive packages, making the grease economically viable for large-scale applications
Solution Approach 2:
The patent uses a composite thickener system combining lithium 12-hydroxystearate (10-30 mass%) and lithium stearate (70-90 mass%) with specific additives including extreme pressure agents and viscosity modifiers to achieve both low dust emission and high load bearing capacity, creating a synergistic formulation that overcomes the limitations of single-component greases
2Object-generated harmful factors
If conventional grease with low viscosity is used, then dust emission is reduced, but load bearing capacity is insufficient for large-scale clean robots
Solution Approach 1:
The patent optimizes the kinematic viscosity of the base oil within 10-50 mm²/s at 40°C and precisely controls the thickener content (15-35 mass%) and additive concentrations to achieve the optimal balance between low dust emission and high load bearing capacity, adapting the grease properties to the specific requirements of large-scale clean robots
Solution Approach 2:
The patent employs a composite formulation combining hydrocarbon-based synthetic oil with specific viscosity, lithium complex soap thickener, and a tailored additive package including extreme pressure agents (such as molybdenum dithiocarbamate or zinc dithiophosphate), anti-wear agents, and antioxidants to simultaneously achieve low dust emission and high load bearing capacity
3Strength
If extreme-pressure agent is added to grease composition, then load bearing capacity is improved, but dust emission behavior deteriorates
Solution Approach 1:
The patent carefully controls the concentration of extreme-pressure agents (such as molybdenum dithiocarbamate or zinc dithiophosphate) within optimal ranges and balances them with other additives to minimize dust emission while maintaining sufficient load bearing capacity for the intended application
Solution Approach 2:
The patent uses the lithium complex soap thickener and base oil as intermediary substances that mediate between the extreme-pressure agent and the environment, allowing the extreme-pressure agent to provide load bearing capacity while the thickener system controls dust emission by retaining the lubricant and its additives in the grease structure
Data Source
Figure 1-1(a)~1-1(b)
Figure 1-2(a)~1-2(b)
Figure 2
AI summary
An object of the invention is to provide a grease composition, having enough low-dust generation property for using thereof in a clean environment, for example, a clean room, and having enough load bearing in order to lubricate a motion guiding device to be incorporated in a large-scale of clean robot. The grease composition for a clean environment comprising, a base oil, a thickener and a extreme-pressure agent, in which a kinetic viscosity of the base oil at 40°C is 100~300 mm2/s, the thickener comprising a lithium complex soap, a content of the thickener is 10~40 mass% with respect to the total amount of the grease composition.