Polyamide 4.10 Multifilament Yarn for Tire Reinforcement
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Solution Overview
Problem
Current reinforcement materials for pneumatic vehicle tire belt bandages, primarily based on fossil raw materials, lack suitable stretchability and modulus, and natural fibers like cotton are unsuitable due to inconsistent quality and poor shrinkage behavior, while environmentally friendly options like polyamide 10.10 have inadequate properties for high-speed tires.
Innovation Solution
Development of multifilament yarns made from polyamide 4.10, which is partially bio-based, using renewable resources like castor oil-derived sebacic acid, offering improved stretchability, modulus, and consistent quality, and can be produced as endless fibers with low water absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If polyamide 10.10 is used as reinforcement material, then environmental friendliness is improved, but mechanical properties (modulus and shrinkage) deteriorate
Solution Approach 1:
The invention changes the chemical parameters of the polyamide by selecting a specific type (PA 4.10) with different monomer chain lengths than conventional PA 10.10. This parameter change results in improved mechanical properties (higher modulus and shrinkage) while maintaining the environmental benefit of being derived from renewable castor oil resources
Solution Approach 2:
The invention uses composite construction by combining polyamide 4.10 fibers with rubber compounds in a belt bandage layer. This composite material approach allows the polyamide to provide both environmental benefits and enhanced mechanical properties through the synergistic combination of materials
2Strength
If polyamide 6.6 is used as reinforcement material, then mechanical properties (modulus and shrinkage) are improved, but environmental friendliness deteriorates
Solution Approach 1:
The invention changes the chemical composition parameters by replacing petroleum-based monomers in PA 6.6 with bio-based alternatives. Specifically, it uses polyamide 4.10 where the diamine component can be derived from castor oil, thereby achieving similar mechanical properties to PA 6.6 while improving environmental sustainability
Solution Approach 2:
The invention adopts a renewable resource approach by using castor oil-derived materials that can be sustainably replenished, replacing the finite petroleum resources used in conventional PA 6.6. This ensures long-term sustainability while maintaining performance
3Object-affected harmful factors
If natural fibers like cotton are used as reinforcement material, then environmental friendliness is improved, but product quality consistency deteriorates
Solution Approach 1:
The invention uses engineered polyamide 4.10 fibers that combine the environmental benefits of natural-derived materials with the consistency of synthetic fiber production. The controlled manufacturing process ensures uniform fiber properties while the castor oil origin maintains environmental sustainability
Solution Approach 2:
The invention changes the structural parameters of natural fibers by creating regenerated or engineered fibers from castor oil-derived polymers. This process maintains the renewable origin while achieving the structural consistency and endless fiber structure required for high-quality tire reinforcements
4Strength
If polyamide 4.10 is used as reinforcement material, then stretchability and shrinkage are improved, but water absorption increases
Solution Approach 1:
The invention optimizes the chemical parameters of polyamide 4.10 through controlled polymerization and fiber processing. By adjusting the degree of polymerization, crystallinity, and fiber structure, it achieves the desired balance between stretchability/shrinkage and water absorption resistance for tire application
Data Source
AI summary
The invention relates to a reinforcement layer for a pneumatic vehicle tyre, preferably for a belt bandage layer of a vehicle pneumatic tyre, wherein the reinforcement layer comprises reinforcing supports with at least one multifilament yarn, and wherein said at least one multifilament yarn consists of polyamide, most of which is based on renewable raw materials. In order to preserve the environment and the resources in combination with improved product quality, the multifilament yarn is made of polyamide 4.10.