Block Copolymer Sheathing for Rubber Adhesion Without Formaldehyde
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Solution Overview
Problem
Current adhesive systems for reinforcing rubber articles, such as pneumatic tires, contain formaldehyde, which is undesirable due to regulatory changes, and rely on metal salts that increase costs and sensitivity to oxidation and aging.
Innovation Solution
A reinforced product featuring reinforcing threads coated with a sheathing composition of block copolymers comprising polyamide and polyolefin blocks, allowing direct adhesion to rubber without the need for metal salts and formaldehyde-based adhesives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RFL adhesives containing formaldehyde and metal salts are used to bond reinforcing threads to rubber, then adhesion is achieved, but the product suffers from increased cost, sensitivity to oxidation, and aging issues
Solution Approach 1:
The invention extracts and eliminates the harmful components (formaldehyde and metal salts) from the adhesive system by replacing the traditional RFL adhesive with a block copolymer adhesive that achieves bonding without these harmful substances, thereby removing the sources of oxidation sensitivity and aging problems
Solution Approach 2:
The invention changes the chemical composition parameters of the adhesive system by substituting the formaldehyde-based RFL adhesive with a block copolymer adhesive having specific compositional parameters (polyamide and polyolefin blocks in defined ratios), which fundamentally alters the adhesive's chemical stability and eliminates oxidation sensitivity
2Reliability
If RFL adhesives containing metal salts are used to maintain adhesive performance, then adhesion is improved, but the cost significantly increases
Solution Approach 1:
The invention extracts and eliminates the expensive metal salt components from the adhesive system, replacing them with a block copolymer adhesive that achieves comparable or superior adhesive performance through its polyamide-polyolefin structure without requiring costly metal additives
Solution Approach 2:
The invention replaces expensive metal salt-based RFL adhesives with a more economical block copolymer adhesive system that achieves the required performance at lower cost, making the overall product more cost-effective
3Strength
If traditional thermoplastic materials like polyamide or polyester are used for sheathing reinforcing threads, then protection and structural rigidity are achieved, but the sheathing requires additional adhesive layers for bonding to rubber
Solution Approach 1:
The invention merges the sheathing function with the adhesive function by incorporating block copolymer adhesive material directly into the sheathing composition, creating a multi-functional layer that simultaneously provides structural protection, rigidity, and bonding capability to rubber, thereby eliminating the need for separate adhesive layers
Solution Approach 2:
The block copolymer sheathing material performs multiple functions simultaneously: it provides the structural rigidity and protection of traditional thermoplastic sheathing while also delivering adhesive bonding to rubber, making the sheathing layer a universal component that combines previously separate functions
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 use of block copolymer-coated reinforcing threads provides effective adhesion to rubber while eliminating the need for formaldehyde and metal salts, reducing costs and improving durability and resistance to aging.
Implementation Method 1
the said thread or threads being covered individually or collectively with a sheath comprising a sheathing composition comprising one or more block copolymers... provides effective adhesion to rubber
Data Source
AI summary
A reinforced product, which can be used in particular for the reinforcing of a finished rubber article, comprises one or more textile or metallic reinforcing threads, the said thread or threads being covered individually or collectively with a sheath comprising a sheathing composition comprising one or more block copolymers comprising at least one polyamide block and at least one polyolefin block, the sheathed thread or threads being themselves embedded in a rubber composition.