Vulcanized Rubber Surface Treatment Agent for Friction and Abrasion
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Solution Overview
Problem
Existing surface-treating agents for vulcanized rubber fail to adequately reduce friction and improve abrasion resistance, especially under high surface pressure and temperature conditions, leading to issues like peeling and gas/oil leakage in rubber-coated parts.
Innovation Solution
A surface-treating agent comprising isocyanate group-containing 1,2-polybutadiene, a wax with a softening point of 40 to 160°C, and fluororesin particles, with an OH group-containing fluororesin composition added as an organic solvent solution to reduce friction and enhance abrasion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an aqueous dispersion of polyolefin resin is added to liquid hydroxyl group-containing 1,2-polybutadiene and isocyanate group-containing 1,2-polybutadiene, then the abrasion resistance of the rubber coating layer is improved, but the viscosity of the surface-treating agent increases and gelation occurs due to water reaction with isocyanate groups
Solution Approach 1:
The patent changes the dispersion medium from aqueous to organic solvent (such as methyl isobutyl ketone, butyl acetate, or toluene). This parameter change prevents water from reacting with isocyanate groups, thereby avoiding viscosity increase and gelation while maintaining the ability to form abrasion-resistant coating films on vulcanized rubber surfaces.
Solution Approach 2:
The patent introduces an organic solvent as an intermediary medium to dissolve or disperse the polyolefin resin and other components. This intermediary prevents direct contact between water and isocyanate groups, eliminating the harmful reaction while still allowing the formation of a cohesive coating film with improved abrasion resistance.
2Ease of manufacture
If an organic solvent dispersion of polyolefin resin is used instead of aqueous dispersion, then the workability is improved, but the coating film peels due to adhesion during high temperature compression and friction at high surface pressure
Solution Approach 1:
The patent creates a composite surface-treating agent system combining polyolefin resin, organic solvent, and additional components (such as fluororesin, wax, or silane-modified polyolefin resin). This composite formulation provides both the workability benefits of organic solvent dispersion and the adhesion resistance needed to prevent peeling under high temperature and pressure conditions.
Solution Approach 2:
The patent modifies specific properties of the coating film by incorporating components with localized functions. For example, fluororesin or wax components are added to specific regions or phases of the coating to provide low-friction, high-temperature stability, while the polyolefin resin provides the base adhesion and flexibility. This local quality differentiation allows the coating to resist peeling under severe service conditions.
3Reliability
If conventional surface-treating agents are used, then the rubber coating layer is protected under normal conditions, but the friction and abrasion resistance are insufficient under high surface pressure and temperature with vibration
Solution Approach 1:
The patent introduces fluororesin or wax components as intermediary low-friction layers within the coating formulation. These intermediaries reduce the coefficient of friction between the rubber coating and mating surfaces, thereby reducing abrasive wear under high surface pressure and vibration conditions while maintaining the protective function under normal service conditions.
Solution Approach 2:
The patent changes the chemical composition parameters of the surface-treating agent by incorporating fluororesin, silane-modified polyolefin resin, or specific wax components. These parameter changes modify the surface properties of the coating film to provide lower friction and higher abrasion resistance under severe service conditions while preserving the protective functions under normal conditions.
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 solution effectively reduces friction and improves abrasion resistance across the entire coating film, preventing adhesion and peeling, and enhancing the sealing and sliding properties of vulcanized rubber parts.
Implementation Method 1
water promoted the reaction between the hydroxyl group and the isocyanate group in the 1,2-polybutadiene
Implementation Method 2
a surface-treating agent for vulcanized rubber comprising an organic solvent solution comprising 10 to 160 parts by weight of wax having a softening point of 40 to 160°C
Implementation Method 3
wax having a softening point of 40 to 160°C
Implementation Method 4
fluororesin particles as essential components, wherein the friction of the entire coating film formed from the surface-treating agent is further reduced
Data Source
AI summary
A surface-treating agent for vulcanized rubber, comprising 10 to 160 parts by weight of a wax having a softening point of 40 to 160°C and 10 to 160 parts by weight of fluororesin particles based on 100 parts by weight of the total amount of isocyanate group-containing 1,2-polybutadiene and an OH group-containing fluororesin composition that has the following formulation: a copolymer [I] of (A) a perfluoroalkylalkyl (meth)acrylate and (B) a hydroxyl group-containing (meth)acrylate, a polymer [II] of an acrylic acid alkyl ester, a polymer [III] of a fluorinated olefin, and a curing agent [IV]; wherein the weight ratio of the isocyanate group-containing 1,2-polybutadiene and the OH group-containing fluororesin composition is 50:50 to 95:5.