Silicate Fibre Microbeads for Low Dust Tyre Reinforcement
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Solution Overview
Problem
The use of silicate fibres with needle-shaped morphology of nanometric size in elastomeric compositions for tyres is hindered by their high dustiness, making them difficult to handle and incorporate into mixers, leading to issues with dosage, dispersibility, contamination, and machine damage, with no known methods to industrially utilize them effectively without these drawbacks.
Innovation Solution
The preparation of microbeads comprising silica and silicate fibres with needle-shaped morphology, where the silica decreases the viscosity of aqueous suspensions, allowing for nebulization drying and producing stable microbeads with a high fibre content, reducing dustiness and energy consumption, and improving processability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If silicate fibres with needle-shaped morphology of nanometric size are directly incorporated into elastomeric materials, then reinforcing properties and reduced rolling resistance are improved, but dustiness increases making handling and dosage difficult
Solution Approach 1:
The silicate fibres are segmented into needle-shaped nanometric sizes (1-100 nm diameter, 0.1-10 microns length) through controlled acid treatment of sepiolite, creating discrete reinforcing elements that can be evenly distributed in the elastomeric matrix while maintaining high surface area for reinforcement
Solution Approach 2:
A coupling agent serving as an intermediary substance is used to bridge the silicate fibres and elastomeric matrix, improving interfacial adhesion and reducing fibre aggregation, thereby enhancing reinforcing properties while facilitating easier handling through better dispersion
2Ease of manufacture
If silicate fibres are dried from residual water after extraction, then they become usable as filler, but they assume powdery consistency with low apparent density increasing dustiness
Solution Approach 1:
The physical and chemical parameters of the silicate fibres are modified through controlled acid treatment, which etches the fibre surfaces and creates a rougher topology that enhances adhesion to the elastomeric matrix. This treatment also modifies the surface chemistry to reduce fibre-fibre interactions that lead to powdery consistency, thereby reducing dustiness while maintaining filler usability
Solution Approach 2:
The silicate fibres are combined with the elastomeric matrix to form a composite material where the fibres are embedded and distributed throughout the continuous phase. This composite structure prevents the fibres from existing as loose powdery particles, eliminating dustiness while maintaining the reinforcing properties of the silicate fibres
3Device complexity
If silicate fibres are incorporated using conventional batch mixers, then processing is simplified, but dispersibility and dosage precision deteriorate due to high dustiness
Solution Approach 1:
The silicate fibres undergo preliminary treatment with acid before incorporation into the elastomeric matrix. This pre-treatment modifies the fibre surface properties, reducing aggregation tendencies and improving dispersion characteristics, which enables precise dosage and good dispersibility even when using conventional batch mixers
Solution Approach 2:
A coupling agent is introduced as an intermediary substance that facilitates the interaction between silicate fibres and elastomeric matrix. This coupling agent improves wetting and adhesion of fibres during mixing, enabling precise dosage control and uniform dispersibility while maintaining the simplicity of conventional batch mixing processes
4Extent of automation
If pneumatic conveying systems are used to convey silicate fibres, then material handling is automated, but systems are easily clogged requiring continuous maintenance
Solution Approach 1:
The flow properties of the silicate fibres are modified through acid treatment and surface modification, changing parameters such as surface charge, hydrophobicity, and particle-particle interaction forces. These parameter changes reduce fibre aggregation and improve flow characteristics, preventing clogging in pneumatic conveying systems while maintaining automation
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 enables the industrial production of microbeads with a high content of silicate fibres, enhancing their dispersibility and reinforcing action in elastomeric materials while minimizing dustiness and energy costs, resulting in improved mechanical properties and reduced rolling resistance in tyres.
Implementation Method 1
wherein the silica decreases the viscosity of aqueous suspensions, allowing for nebulization drying
Implementation Method 2
allowing for nebulization drying and producing stable microbeads
Data Source
AI summary
Microbeads are described, comprising silica fibres with needle-shaped morphology of nanometric size, characterised by reduced dustiness and good dispersibility in elastomeric materials, a process for the preparation thereof and the use thereof in the production of vehicle tyres.