Chlorinated Elastomer Anti-Ozonant Coating for Aircraft Tires
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Solution Overview
Problem
Crosslinked rubber articles, particularly aircraft pneumatic tires, face rapid ozone-induced crack propagation due to high stress and pressure conditions, necessitating more effective anti-ozone protection than conventional solutions provide, which often result in surface marking and limited protection due to the use of anti-ozonant compounds and waxes.
Innovation Solution
An anti-ozone protective composition based on a chlorinated elastomer, hydrocarbon solvent, and polar aprotic solvent is applied directly to the rubber surface in a single step, forming a continuous, flexible, and adherent coating that withstands ozone degradation without the need for surface functionalization, ensuring uniform thickness and enhanced protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If anti-ozonant compounds and waxes are incorporated into rubber compositions, then ozone protection is improved, but surface appearance deteriorates due to blooming marks
Solution Approach 1:
The patent extracts the anti-ozonant function from the rubber composition itself and places it in a separate protective coating applied to the surface. This coating contains the anti-ozonant compounds (60-90 phr per 100 phr elastomer) rather than incorporating them into the bulk rubber, preventing blooming while maintaining protection.
Solution Approach 2:
The patent applies a flexible protective coating film on the rubber surface that contains high concentrations of anti-ozonant compounds. This thin film provides ozone protection without the compounds migrating to the surface and causing blooming marks on the underlying rubber article.
2Shape
If proportions of anti-ozonant compounds are limited to preserve surface appearance, then surface appearance is maintained, but ozone protection effectiveness deteriorates
Solution Approach 1:
The patent uses a flexible protective coating that can be applied in thin layers (5-50 micrometers) while containing high concentrations of anti-ozonant compounds (60-90 phr per 100 phr elastomer). This provides effective ozone protection without the limitations of low-concentration compositions.
Solution Approach 2:
The patent creates a composite protective coating combining chlorinated elastomer (30-70 parts), anti-ozonant compounds (60-90 parts per 100 parts elastomer), and solvents. This composite structure provides both effective ozone protection and acceptable surface appearance.
3Reliability
If conventional anti-ozone coatings are applied in multiple thin layers, then adhesion is improved, but application complexity and coating uniformity deteriorate
Solution Approach 1:
The patent merges adhesion promotion and ozone protection functions into a single coating composition. The chlorinated elastomer provides inherent adhesion to rubber surfaces while the high anti-ozonant content provides protection, eliminating the need for separate adhesion-promoting layers or multiple application steps.
Solution Approach 2:
The patent changes the chemical parameters of the coating composition by using chlorinated elastomer with specific chlorine content (20-50%) and combining it with specific solvents (hydrocarbon and polar aprotic). This creates a composition that achieves both adhesion and protection in a single application.
4Reliability
If surface functionalization is performed before coating deposition, then adhesion is improved, but process time and complexity increase
Solution Approach 1:
The patent extracts the adhesion-promoting function from the substrate preparation stage and incorporates it directly into the coating composition itself. The chlorinated elastomer and solvent system provides both adhesion and protection without requiring prior surface functionalization.
Solution Approach 2:
The coating composition is self-sufficient, providing both adhesion to the rubber surface and ozone protection in a single application. No separate surface preparation or functionalization steps are needed, as the composition itself contains all necessary functional properties.
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 composition effectively prevents ozone-induced cracking on aircraft tires by forming a robust, uniform coating that maintains tire integrity under high stress conditions, extending service life and maintaining surface appearance without the limitations of traditional anti-ozonant methods.
Implementation Method 1
forming a continuous, flexible, and adherent coating that withstands ozone degradation without the need for surface functionalization
Implementation Method 2
An anti-ozone protective composition based on a chlorinated elastomer, hydrocarbon solvent, and polar aprotic solvent is applied directly to the rubber surface
Implementation Method 3
Crosslinked rubber articles... are sensitive to the action of ozone due to the presence of these double bonds... The composition effectively prevents ozone-induced cracking on aircraft tires by forming a robust, uniform coating
Data Source
AI summary
An anti-ozone protective composition for a crosslinked rubber article; is based on at least one chlorinated elastomer, at least one hydrocarbon solvent and at least one polar aprotic solvent. A rubber article comprises at least one elastomeric surface in contact with air, said surface being completely or partly coated with said composition.