Method for producing a reinforcing support
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Solution Overview
Problem
Existing methods for producing reinforcement layers for elastomeric products, such as vehicle tires, face challenges in achieving sufficient adhesion between reinforcements and rubber mixtures under mechanical and dynamic stress, often relying on harmful substances like resorcinol and formaldehyde.
Innovation Solution
A method involving dipping textile reinforcements in an epoxidized natural rubber latex bath, followed by drying and heating, and subsequent rubberization with a diene rubber mixture, avoids the use of harmful substances while achieving comparable or improved adhesion through the use of blocked diisocyanates and vinyl-pyridine polymers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If resorcinol-formaldehyde latex (RFL dip) is used for adhesion activation, then sufficient adhesion between reinforcing elements and rubber compound is achieved, but environmentally and health-damaging substances are used
Solution Approach 1:
The patent replaces harmful substances (resorcinol and formaldehyde) with epoxidized natural rubber latex, which achieves the same adhesion activation function without the harmful environmental and health effects. The epoxidized natural rubber latex contains epoxy groups that react with the rubber compound to provide sufficient adhesion, effectively converting a harmful process into a beneficial one by eliminating toxic substances while maintaining or improving performance.
2Reliability
If standard RFL dip treatment is used, then adhesion is achieved, but the process uses harmful substances that require special handling and disposal
Solution Approach 1:
The patent eliminates the need for harmful substance disposal by replacing the RFL dip system with epoxidized natural rubber latex. The epoxy-containing latex provides the necessary adhesion activation through its reactive epoxy groups, which form strong bonds with the rubber compound during vulcanization, thereby eliminating toxic waste generation and disposal requirements.
3Object-affected harmful factors
If epoxidized natural rubber latex is used instead of RFL dip, then harmful substances are eliminated, but adhesion performance must be maintained or improved
Solution Approach 1:
The patent changes the chemical parameters of the adhesion activation system by using epoxidized natural rubber latex with specific epoxy content (5-50 mol%) instead of resorcinol-formaldehyde latex. This parameter change maintains or improves adhesion performance through the reactive epoxy groups that form strong chemical bonds with the rubber compound, while simultaneously eliminating harmful substances. The process parameters including drying temperature (120-155°C) and heating temperature (210-250°C) are optimized to ensure complete reaction and maximum adhesion.
4Reliability
If multiple treatment baths and complex processes are used, then adhesion is improved, but manufacturing complexity increases
Solution Approach 1:
The patent merges the adhesion activation function and the rubber coating function into a single treatment bath containing epoxidized natural rubber latex. This eliminates the need for separate RFL dip treatment and subsequent rubber coating steps, thereby simplifying the manufacturing process while maintaining effective adhesion. The combined approach reduces the number of process steps, equipment requirements, and handling operations without compromising the adhesion performance.
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
This method provides a durable reinforcement layer with enhanced adhesion to the rubber mixture, comparable to standard RFL-Dip treatments, while eliminating the use of environmentally and health-hazardous substances like resorcinol and formaldehyde.
Implementation Method 1
The bath contains an epoxyd natural rubber in toluene... treatment of textile fabrics or textile reinforcing elements with a malein-functionalized polymer to improve adhesion to rubber compounds
Implementation Method 2
e) Subsequent drying of the reinforcement elements at 120 to 155 °C
Implementation Method 3
f) Subsequent heating of the reinforcement elements to 210 to 250 °C... rubber coating of the textile reinforcement elements pretreated by means of d) to f)
Data Source
AI summary
The invention relates to a method for producing a reinforcement layer from textile reinforcements for elastomeric products, the method comprising immersing the textile reinforcements in at least one bath which contains at least one epoxidized natural rubber latex and is free of free resorcinol and free formaldehyde and their precondensates, includes. Furthermore, the invention relates to a reinforcement layer produced using the method and to a vehicle tire that contains at least one reinforcement layer according to the invention.