Oil Seal Lip Surface-Treating Agent for Friction Reduction
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Solution Overview
Problem
Oil seals experience reduced service life and energy loss due to frictional heat and resistance, with existing low-friction coatings losing effectiveness over time.
Innovation Solution
A surface-treating agent comprising a lubricant filler and an adduct of toluene diisocyanate and trimethylolpropane is applied to the vulcanized rubber surface of oil seal lip portions, providing excellent adhesion, abrasion resistance, and lubricity, extending the seal's service life and reducing energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a low-friction coating film is applied to the oil seal lip surface, then friction is reduced, but the coating film is removed by sliding and loses effectiveness
Solution Approach 1:
The patent applies a composite coating containing fluororesin (for low friction), wax (for lubricity), and isocyanate group-containing polybutadiene (for adhesion to rubber). This composite formulation combines multiple materials with complementary properties to achieve both low friction and durable attachment to the oil seal lip surface.
Solution Approach 2:
The patent specifies precise parameter ranges: fluororesin content (10-160 parts by weight per 100 parts polybutadiene), wax softening point (40-160°C), and isocyanate group content (2-20%). By optimizing these parameters, the coating achieves optimal balance between friction reduction and durability resistance to sliding removal.
2Temperature
If wax with high softening point is used to improve heat resistance, then friction resistance improves, but adhesion to rubber surface deteriorates
Solution Approach 1:
The patent defines an optimal softening point range for wax (40-160°C) and specifies the ratio of wax to isocyanate group-containing polybutadiene (10-160:100 by weight). This parameter optimization ensures the wax provides sufficient heat resistance while maintaining adequate adhesion through the isocyanate crosslinking network.
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 agent significantly extends the service life of oil seals by enhancing abrasion resistance and lubricity, leading to energy savings in equipment using the seals.
Implementation Method 1
the adduct has free isocyanate groups, the adduct has excellent adhesion to vulcanized rubber, i.e., a sealing material, and thus acts as a binding agent with a base material
Implementation Method 2
a coating film obtained by curing the agent contains a lubricant filler, and thus has an improved abrasion resistance, lubricity, and creep resistance
Data Source
AI summary
Disclosed is a surface-treating agent for oil seal lip portion, comprising a lubricant filler and an adduct compound consisting of an adduct of toluene diisocyanate and trimethylolpropane, the surface-treating agent being applied to the surface of vulcanized rubber forming a lip portion of an oil seal comprising the lip portion and a metal ring. The application of the surface-treating agent of the present invention to the sliding surface of a seal lip portion of an oil seal effectively lengthens the service life of the oil seal, when used in a sliding part or a moving part, and leads to energy saving of equipment that uses the oil seal.