Polyurea Crosslinked Particles for Oil Retention in Sliding Coatings
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing sliding member surface treatments with solid lubrication films lack sufficient oil adsorption and retention, leading to inadequate friction reduction and torque reduction, as the oil film is easily scraped off during sliding, and the lubricant gradually degrades with increased acidity, causing a decrease in sliding performance over time.
Innovation Solution
Polyurea crosslinked particles with high acid resistance are used in a lubricant-retaining coating film, formed by reacting self-emulsifying and non-self-emulsifying isocyanates in the presence of water, which have a high crosslink density and improved oil adsorption properties, maintaining a stable sliding performance and oil retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If resin particles having a high affinity with an oil are included in a coating film to improve oil adsorption property, then oil retainability increases, but resin particles are decomposed by acid in degraded lubricant, causing oil retainability to decrease
Solution Approach 1:
The invention changes the chemical composition parameters of the resin particles by specifying particular polymers (polyvinylidene fluoride, polytetrafluoroethylene, polyacrylic acid, or their copolymers) with defined chemical structures that provide both oil affinity and acid resistance. This parameter change resolves the contradiction by selecting materials whose molecular structure inherently resists acid decomposition while maintaining oil adsorption capability.
Solution Approach 2:
The invention uses composite material strategy by combining specific fluorinated polymers with acid-resistant characteristics. These composite resin particles integrate both oil-adsorbing functional groups and acid-resistant backbone structures, allowing simultaneous achievement of high oil retainability and stability against acid degradation from lubricant aging.
2Force
If a solid lubrication film is formed to reduce frictional resistance, then sliding torque decreases, but the oil film is scraped off during sliding, making it difficult to sustainably decrease frictional resistance
Solution Approach 1:
The resin particles in the coating film perform self-service by automatically adsorbing and retaining lubricant oil during sliding operations. This self-adsorbing mechanism ensures continuous oil film formation on the sliding surface, preventing the oil film from being scraped off and maintaining sustainable friction reduction without external intervention.
Solution Approach 2:
The resin particles create a porous or micro-structured coating film that physically traps and retains lubricant oil. This porous structure allows the coating to act as an oil reservoir, continuously supplying lubricant to the sliding interface and preventing oil film removal during sliding, thereby sustaining low frictional resistance over extended periods.
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 polyurea crosslinked particles enhance long-term oil retainability and sliding performance, reducing frictional resistance and thermal degradation, while maintaining high heat resistance and preventing the decomposition of resin particles, thus ensuring sustainable sliding properties and reduced torque in transport device members.
Implementation Method 1
particles formed of reactants of a self-emulsifying isocyanate having two or more isocyanate groups and a non-self-emulsifying isocyanate having two or more isocyanate groups and having a ring structure in the presence of water
Implementation Method 2
a crosslink density thereof is 1×10−4 mol/g or more
Implementation Method 3
resin particles having a high affinity with an oil are considered to be included in a coating film... increase long-term oil retainability
Data Source
AI summary
Polyurea crosslinked particles for a transport device member are provided that have high acid resistance, increase long-term retainability when included in a coating film, and are capable of maintaining a high sliding property for a long time. The polyurea crosslinked particles for a transport device member are particles formed of reactants of a self-emulsifying isocyanate having two or more isocyanate groups and a non-self-emulsifying isocyanate having two or more isocyanate groups and having a ring structure in the presence of water and a crosslink density thereof is 1×10−4 mol/g or more.