Silica Tire Rubber Compound With Monomeric Silane Coupling
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Solution Overview
Problem
Existing rubber mixtures with silica face challenges in balancing rolling resistance behavior, abrasion, and reinforcing effect, often compromising one property for the sake of others, particularly when natural rubber is the main polymer component.
Innovation Solution
A sulfur-crosslinkable rubber mixture comprising diene rubber, silica, and a specific silane with the general molecular formula (R1< R2< R3< Si-) m -A-C(R3< 2 )-X, which improves rolling resistance and reinforcing effect without negatively impacting other physical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silica is used to replace carbon black filler in rubber compounds, then driving characteristics are improved, but rolling resistance increases and abrasion behavior deteriorates
Solution Approach 1:
The patent applies parameter changes by modifying the silane molecular structure from conventional multimeric forms to a specific monomeric structure with formula (R1R2R3Si-)m-A-C(R3)2-X, where m is 0 or 1. This structural parameter change enables the silane to achieve optimal balance between rolling resistance, abrasion resistance, and reinforcing effect that cannot be achieved with conventional silane structures.
Solution Approach 2:
The patent creates a composite material system combining diene rubber, silica filler, and the specific monomeric silane coupling agent. This composite formulation achieves synergistic effects where the silane properly couples silica to the rubber matrix, improving overall performance beyond what individual components can achieve alone, particularly in resolving the contradiction between rolling resistance and abrasion resistance.
2Loss of energy
If monomeric silanes are used to improve rolling resistance behavior, then rolling resistance is improved, but processability deteriorates and abrasion loss increases
Solution Approach 1:
The patent modifies the silane structure parameters by controlling the value of m to be 0 or 1 and specifying particular groups for R1-R6, A, and X. This precise parameter control allows the monomeric silane to maintain good processability while achieving improved rolling resistance, avoiding the excessive stiffness and poor processability associated with other monomeric silanes.
3Loss of energy
If protected mercaptosilanes are used to improve rolling resistance, then rolling resistance is slightly improved, but stiffness increases and handling potential is reduced
Solution Approach 1:
The patent changes the molecular structure parameters of the silane by specifying that m is 0 or 1 and defining particular chemical groups for R1-R6, A, and X. This structural modification achieves rolling resistance improvement without the excessive stiffness increase that occurs with protected mercaptosilanes, thereby maintaining good handling potential.
4Strength
If silica-silane system is used in compounds with more than 50 phr natural rubber, then reinforcement is achieved, but abrasion losses increase and rolling resistance behavior deteriorates
Solution Approach 1:
The patent applies parameter changes by using a monomeric silane structure with m=0 or 1 instead of conventional multimeric silanes. This structural parameter change enables effective silica reinforcement in high natural rubber content compounds (more than 50 phr) while maintaining acceptable rolling resistance behavior and reducing abrasion losses compared to conventional silane systems.
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 achieves enhanced rolling resistance, abrasion resistance, and handling behavior, maintaining optimal physical properties, making it suitable for various tire components and technical rubber articles.
Implementation Method 1
Organosilanes are used in silicic acid-containing rubber compounds to make the silica hydrophobic and thereby create the bond between the filler and the polymer
Implementation Method 2
the silane with the general molecular formula (R1< R2< R3< Si-) m -A-C(R3< 2 )-X... creates the bond between the filler and the polymer
Implementation Method 3
sulfur cross-linkable rubber mixture... A sulfur-crosslinkable rubber mixture comprising diene rubber, silica, and a specific silane
Implementation Method 4
sulfur cross-linkable rubber mixture... enhances its physical properties
Data Source
AI summary
The invention relates to a sulfur-curable rubber compound, a vulcanizate, and a vehicle tire. The sulfur-curable rubber compound contains at least the following components: - at least one diene rubber and - 5 to 400 phr of at least one silica and - 5 to 150 phr of at least one carbon black and - at least one silane B with the general formula I) or II) I) (R1)oSi-(R2-)mAC(R32)-X II) (R1)oSi-(R4-)kC(R3X)-A where A is an aromatic group; and where X is selected from halide, tosylate, mesylate, and trifluoromethanesulfonate groups.