Composite Reinforcement Adhesion via Silane Coupling
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Solution Overview
Problem
Existing composite reinforcements for rubber articles, such as tires, require metal salts like cobalt salts for maintaining adhesive properties, which increase costs and sensitivity to oxidation and aging, and rely on RFL adhesives containing formaldehyde, undesirable due to regulatory changes.
Innovation Solution
A composite reinforcement comprising a reinforcing thread covered with a thermoplastic polymer and a second layer of unsaturated thermoplastic stirene elastomer and poly(p-phenylene ether), which adheres directly to a diene elastomer matrix without the need for metal salts or RFL adhesives, achieved through a thermo-oxidative treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If RFL adhesives containing formaldehyde are used to bond composite reinforcements to rubber matrices, then adhesion strength is improved, but environmental compliance deteriorates and health hazards increase
Solution Approach 1:
The invention extracts and eliminates formaldehyde from the adhesive system by replacing RFL adhesives with a silane-based adhesive composition. The silane coupling agent forms chemical bonds with both the glass fiber reinforcement and the rubber matrix, achieving adhesion without harmful formaldehyde content, thus resolving the contradiction between adhesion strength and environmental compliance
Solution Approach 2:
The invention changes the chemical parameters of the adhesive system by introducing silane coupling agents with specific functional groups that can bond to both glass fibers and rubber. This parameter change enables adhesion through alternative chemical mechanisms (silane hydrolysis and condensation) rather than formaldehyde-based bonding, maintaining strength while eliminating harmful substances
2Duration of action of moving object
If metal salts such as cobalt salts are added to rubber matrices to maintain adhesive properties, then adhesion durability is improved, but cost increases and oxidation sensitivity worsens
Solution Approach 1:
The invention extracts and removes metal salts (particularly cobalt salts) from the rubber matrix formulation. Instead, it uses silane coupling agents that provide adhesion durability through silicon-oxygen-silicon bond formation and crosslinking, eliminating the need for metal salt accelerators and their associated oxidation problems
Solution Approach 2:
The invention replaces expensive metal salts with a cost-effective silane-based adhesive system. The silane coupling agent provides durable adhesion through chemical bonding without requiring metal salt additives, reducing both material cost and oxidation sensitivity while maintaining adhesion durability
3Reliability
If composite reinforcements use thermoplastic sheathing to protect metal cores, then corrosion resistance is improved, but direct adhesion to rubber matrices deteriorates
Solution Approach 1:
The invention introduces a silane-based adhesive composition as an intermediary between the thermoplastic-sheathed composite reinforcement and the rubber matrix. This adhesive mediator chemically bonds to both the thermoplastic sheath and the rubber, enabling strong adhesion while preserving the corrosion protection provided by the thermoplastic layer
Solution Approach 2:
The invention uses a composite adhesive system comprising silane coupling agents, silane-modified polymers, and crosslinking agents that creates a multi-functional interface layer. This composite adhesive provides both adhesion to the thermoplastic sheath and chemical bonding to the rubber matrix, resolving the contradiction between corrosion resistance and adhesion strength
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 provides strong adhesion to diene elastomer matrices without formaldehyde-based adhesives, reducing costs and oxidation sensitivity, and enhancing the durability of rubber articles.
Implementation Method 1
The adhesive composition comprises a silane coupling agent... which adheres directly to a diene elastomer matrix... through a thermo-oxidative treatment
Implementation Method 2
The adhesive composition comprises a silane coupling agent... providing adhesion through chemical bonding
Implementation Method 3
achieved through a thermo-oxidative treatment
Data Source
AI summary
Composite reinforcement (R-2) capable of adhering directly to a diene rubber matrix, which can be used as reinforcing element for a tire, comprising: one or more reinforcing thread(s) (20), for example a carbon steel cord; a first layer (21) of a thermoplastic polymer, the glass transition temperature of which is positive, for example 6,6 polyamide, covering said thread or said threads; a second layer (22) of a composition comprising an unsaturated thermoplastic stirene (“TPS”) elastomer, the glass transition temperature of which is negative, for example an SB (stirene/butadiene) or SBS (stirene/butadiene/stirene) block copolymer, as well as a poly(p-phenylene ether) (“PPE”), covering the first layer (21). Process for manufacturing such a composite reinforcement and rubber article or semi-finished product, especially a tire, incorporating such a composite reinforcement.