Self-Adhesive Composite Reinforcer for Pneumatic Tires
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Solution Overview
Problem
Existing composite reinforcers for diene rubber articles, such as pneumatic tires, face challenges with adhesion due to the use of RFL adhesives containing formaldehyde and resorcinol, which are regulated out, and have complex manufacturing processes involving multiple sheathing steps, impacting production efficiency.
Innovation Solution
A composite reinforcer with a single sheathing operation using a thermoplastic polymer composition comprising poly(p-phenylene ether) and a functionalized unsaturated thermoplastic styrene elastomer, providing direct and high-performance adhesion to diene elastomer matrices without the need for additional adhesives or metal salts like cobalt salts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RFL adhesives containing formaldehyde and resorcinol are used to achieve adhesion between thermoplastic sheathing and diene rubber, then satisfactory adhesion is obtained, but the adhesive composition becomes subject to European regulation restrictions and requires additional adhesive materials
Solution Approach 1:
The thermoplastic polymer composition is formulated to provide self-adhesion to diene rubber without requiring external RFL adhesives. The composition includes specific additives and functional components that enable direct bonding between the sheathing and rubber matrix, eliminating the need for separate adhesive applications and associated regulated chemicals.
Solution Approach 2:
The adhesive mechanism is changed from chemical adhesion via RFL adhesives to thermal-mechanical adhesion through the thermoplastic polymer's melting and bonding characteristics. The polymer composition is designed to soften at processing temperatures and form strong bonds with both the metal core and diene rubber, utilizing temperature-dependent properties rather than chemical adhesive reactions.
2Reliability
If multiple sheathing steps are used to create composite reinforcers with good adhesion, then adhesion performance is improved, but the manufacturing process becomes complex and production efficiency decreases
Solution Approach 1:
The protective sheathing and adhesive functions are merged into a single integrated thermoplastic polymer composition. This composition simultaneously provides mechanical protection to the metal core and ensures adhesion to the diene rubber matrix, eliminating the need for separate sheathing and adhesive application steps while maintaining both protective and bonding performance.
Solution Approach 2:
The thermoplastic polymer composition serves multiple functions: it protects the metal core from corrosion and mechanical damage, provides structural integrity to the composite reinforcer, and ensures adhesion to the diene rubber matrix. This multi-functional material consolidates what would traditionally require multiple separate components and processing steps.
3Duration of action of stationary object
If metal salts like cobalt salts are added to rubber matrices to maintain adhesive properties, then adhesion stability over time is improved, but material cost increases and oxidation and ageing sensitivity increases
Solution Approach 1:
The thermoplastic polymer composition uses stable, non-reactive components that do not require metal salts for long-term adhesion maintenance. The formulation relies on physical and chemical properties of the polymer itself rather than catalytic metal salts, eliminating the need for cobalt salts and associated cost and oxidation issues while maintaining adhesion stability through the polymer's inherent bonding characteristics.
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 achieves excellent adhesion levels comparable to conventional RFL adhesives while simplifying the manufacturing process, eliminating the need for complex multi-step sheathing and reducing material costs and oxidation sensitivity, thus enhancing industrial production efficiency and product performance.
Implementation Method 1
A composite reinforcer with a single sheathing operation using a thermoplastic polymer composition comprising poly(p-phenylene ether) and a functionalized unsaturated thermoplastic styrene elastomer, providing direct and high-performance adhesion to diene elastomer matrices
Data Source
AI summary
A composite reinforcer that can adhere directly to a diene rubber matrix is usable as a reinforcing element for a pneumatic tire. The composite reinforcer includes at least one reinforcing thread, such as a carbon steel cord. Covering each thread individually or several threads collectively is a layer of a thermoplastic polymer composition. The thermoplastic polymer composition includes at least one thermoplastic polymer have a glass transition temperature that is positive, a poly(p-phenylene ether) (PPE), and a functionalized unsaturated thermoplastic styrene (TPS) elastomer having a glass transition temperature that is negative. The TPS elastomer includes a functional group selected from: an epoxide group, a carboxyl group, an acid anhydride group, and an ester group. A process for manufacturing such a composite reinforcer is presented, as well as a process for producing a rubber article, especially a pneumatic tire, incorporating such a composite reinforcer.