Formaldehyde-Free Textile-Rubber Composite for Transparent Tire Aprons
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Solution Overview
Problem
Existing composite materials used for abrasion protection in vehicle tires face challenges such as inadequate adhesion between textile reinforcements and rubber coatings, unwanted coloration from adhesion activators, and difficulty in inspecting the condition of textile reinforcements under the rubber coating.
Innovation Solution
A method for producing vulcanizable composite materials involves treating textile reinforcements with an aqueous dispersion that is free of resorcinol and formaldehyde, and then arranging the adhesion-activated reinforcements on a crosslinkable rubber mixture. The rubber mixture is vulcanized to form a transparent or partially transparent crosslinked rubber coating, allowing the textile reinforcements to be visible and inspected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If RFL dips are used for adhesion activation, then bond strength between textile reinforcements and rubber coating is improved, but coloration of the textile reinforcements occurs
Solution Approach 1:
The invention extracts and removes the harmful coloration property from the adhesion activation process by replacing RFL dips with aqueous dispersions that are substantially free of free resorcinol, resorcinol precondensates, free formaldehyde, and formaldehyde-releasing substances. This allows the adhesion activation function to be retained while eliminating the unwanted reddish-brown coloration that masks the textile reinforcement colors.
Solution Approach 2:
The invention changes the chemical composition parameters of the adhesion activation agent by using aqueous dispersions with specific pH values (5-11) and controlled concentrations of adhesion-promoting substances, replacing the traditional RFL dip composition. This parameter change maintains adhesion activation effectiveness while eliminating the coloration side effect.
2Object-generated harmful factors
If textile reinforcements are coated with adhesion activation on one side only, then coloration is reduced, but manufacturing process complexity increases
Solution Approach 1:
The invention applies adhesion activation to both sides of the textile reinforcement uniformly, eliminating the need for selective one-sided coating. This segmentation approach simplifies the manufacturing process by removing the complexity of determining which side requires treatment and ensures consistent adhesion performance across the entire reinforcement structure.
Solution Approach 2:
The aqueous dispersion formulation provides universal adhesion activation capability for both sides of the textile reinforcement, replacing the need for selective one-sided application. This multi-functional approach simplifies the manufacturing process while maintaining effective bond strength.
3Reliability
If rubber coating is made opaque for protection, then durability is improved, but visibility of textile reinforcements for inspection is reduced
Solution Approach 1:
The invention uses transparent or translucent rubber compounds for the coating, allowing the colored textile reinforcements to remain visible through the coating. This color transparency enables visual inspection of the reinforcement condition while the coating provides protective durability against abrasion and environmental factors.
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 achieves high bond strength between the textile reinforcements and the rubber coating, allows for non-destructive quality testing of the reinforcements, and provides flexibility in color design without unwanted coloration, enhancing the visibility of the tire in poor conditions.
Implementation Method 1
treating the textile reinforcement with an aqueous dispersion to activate the adhesion of the textile reinforcement
Implementation Method 2
The rubber mixture is vulcanized to form a transparent or partially transparent crosslinked rubber coating
Data Source
AI summary
The invention relates to a method for producing a vulcanizable composite material, comprising the steps of: a) producing or providing a textile reinforcement, b) treating the textile reinforcement with an aqueous dispersion to activate the adhesion of the textile reinforcement and to obtain an adhesion-activated textile reinforcement, and c) incorporating the adhesion-activated textile reinforcement into a crosslinkable rubber compound to obtain the vulcanizable composite material, wherein the aqueous dispersion is substantially free of free resorcinol and resorcinol precondensates, in particular resorcinol-formaldehyde precondensates, and is free of free formaldehyde and formaldehyde-releasing substances, wherein the crosslinkable rubber compound can be processed by vulcanization to form a crosslinked rubber compound which is at least partially transparent to visible light, at least in sections.The invention further relates to the manufacture of a vehicle tire and a vehicle tire.