Spike Coating Rubber Composition for Lower Stud Loss
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Solution Overview
Problem
Conventional studded tires face high stud loss rates due to inadequate adhesion of the sleeve rubber compound to the spike pin, leading to material failure and inefficient production processes with high viscosity and slow vulcanization times.
Innovation Solution
A vulcanizable rubber mixture comprising natural rubber, specific synthetic polyisoprene, and fillers like carbon black, with controlled plasticizer oil content, is developed to enhance adhesion and mechanical properties, allowing for efficient production of spike composites with improved durability and reduced stud loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sleeve rubber compounds are used to coat spike pins, then the production process can proceed with standard materials, but the adhesion to the spike pin is insufficient leading to high stud loss rates
Solution Approach 1:
The patent modifies the chemical composition parameters of the rubber compound by incorporating specific silane-modified polymers (polybutadiene and/or polyisoprene) with controlled amounts of crosslinking agents. This chemical parameter change enhances the adhesion properties of the sleeve rubber to the spike pin, directly addressing the reliability issue while reducing stud loss through improved bonding strength.
Solution Approach 2:
The invention creates a composite rubber material system combining conventional rubber base materials with silane-modified polymers and crosslinking agents. This composite approach produces a multi-component sleeve rubber compound that exhibits superior adhesion characteristics compared to conventional single-material compounds, thereby improving reliability and reducing stud loss.
2Ease of manufacture
If the rubber compound viscosity is reduced to improve injection molding, then the coating process becomes easier, but the mechanical strength and durability of the sleeve rubber decrease
Solution Approach 1:
The patent applies preliminary chemical modification to the rubber polymer chains by incorporating silane-modified polymers before the injection molding process. This preliminary action creates reactive groups in the rubber compound that will form crosslinks during vulcanization, ensuring that the final cured product achieves high mechanical strength even though the uncured compound has low viscosity for easy processing.
Solution Approach 2:
The invention changes the rheological parameters of the uncured rubber compound by adding silane-modified polymers, which reduce viscosity and improve flow characteristics for injection molding. Simultaneously, the crosslinking agent content is optimized to ensure that after vulcanization, the mechanical strength parameters reach the required levels, thus resolving the contradiction between processability and strength.
3Strength
If the vulcanization time is extended to ensure complete curing, then the mechanical properties improve, but the production efficiency and productivity decrease
Solution Approach 1:
The patent replaces the conventional thermal curing mechanism with a chemical crosslinking mechanism initiated by silane-modified polymers and crosslinking agents. This substitution allows the vulcanization process to proceed more rapidly through chemical reaction pathways rather than relying solely on slow thermal diffusion, thereby achieving complete curing in shorter times while maintaining or improving mechanical properties.
Solution Approach 2:
The invention changes the kinetic parameters of the vulcanization process by introducing crosslinking agents that accelerate the curing reaction. This parameter change in the chemical reaction kinetics enables the rubber compound to reach full cure state faster, improving productivity while ensuring that the mechanical properties of the vulcanizate meet the required specifications.
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 rubber mixture results in studded tires with enhanced mechanical properties, reduced stud loss, and efficient production processes, ensuring excellent driving characteristics under winter conditions.
Implementation Method 1
a vulcanizable rubber mixture comprising: i) natural rubber in a combined mass fraction of 25 phr or more, ii) synthetic polyisoprene in a combined mass fraction in the range of 20 to 45 phr, wherein the synthetic polyisoprene has a weight-average molecular weight Mw, measured by GPC, in the range of 20,000 to 80,000 g/mol
Data Source
AI summary
The invention relates to a vulcanizable rubber mixture comprising: i) natural rubber in a combined mass fraction of 25 phr or more, ii) synthetic polyisoprene in a combined mass fraction in the range of 20 to 45 phr, wherein the synthetic polyisoprene has a weight-average molecular weight Mw, measured by GPC, in the range of 20,000 to 80,000 g/mol, and iii) one or more fillers in a combined mass fraction of 35 phr or more, wherein the combined mass fraction of plasticizer oils in the vulcanizable rubber mixture is 20 phr or less.