Wire Coat Rubber Composition Using Pre-Silanized Silica
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Solution Overview
Problem
Current tire compositions, particularly wire coat rubber compositions, face challenges in reducing rolling resistance while dealing with complex mixing processes and environmental health concerns associated with conventional silica filler coupling agents.
Innovation Solution
A rubber composition incorporating pre-silanized precipitated silica, cis 1,4-polyisoprene rubber, and solution styrene butadiene rubber, with specific additives like cobalt salts and zinc oxide, to enhance compatibility and adhesion, thereby reducing hysteresis and rolling resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional silica filler with separate coupling agents is used, then adhesion is improved, but mixing time increases and process complexity increases
Solution Approach 1:
The silica filler is pre-silanized with a coupling agent before being incorporated into the rubber composition. This preliminary treatment of the silica surface ensures that the coupling agent is already present and active, eliminating the need for separate coupling agent addition during mixing, thus reducing mixing time while maintaining adhesion benefits
2Strength
If conventional silica filler with separate coupling agents is used, then adhesion is improved, but device complexity increases
Solution Approach 1:
The coupling agent and silica filler are combined into a single pre-silanized silica product. This merging of two separate components (silica and coupling agent) into one integrated material simplifies the manufacturing process by reducing the number of ingredients and steps required, while still providing the adhesion benefits of the coupling agent
3Loss of energy
If conventional silica filler is used, then rolling resistance is reduced, but hysteresis properties deteriorate
Solution Approach 1:
The patent modifies the surface parameters of the silica filler by applying silane treatment, which changes the chemical and physical properties of the silica surface. This parameter change improves the interaction between silica and rubber matrix, optimizing both rolling resistance and hysteresis properties by enhancing dispersion and interfacial bonding
4Stability of the object's composition
If pre-silanized silica is used, then compatibility with rubber matrix is improved, but manufacturing cost increases
Solution Approach 1:
The pre-silanized silica provides self-service functionality by having the coupling agent already integrated into its structure. This eliminates the need for separate coupling agent addition and reduces the complexity of the manufacturing process, which can offset the higher cost of pre-silanized silica through improved processing efficiency and reduced labor requirements
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 composition effectively reduces rolling resistance and improves hysteresis properties, stiffness, and adhesion, while simplifying the mixing process and minimizing environmental and health risks.
Implementation Method 1
the pre-silanized silica as used in the present invention has been pre-silanized with a silane and is added as pre-silanized substance into the rubber composition, respectively the mixing process, in other words as an educt or reactant. Pre-silanizing the silica ensures a better compatibility with the rubber matrix.
Implementation Method 2
A rubber composition is provided, in particular a wire coat rubber composition for a tire or tire component, comprising from 70 phr to 100 phr of cis 1,4-polyisoprene rubber, from 0 phr to 30 phr of solution (polymerized) styrene butadiene rubber (SSBR)
Implementation Method 3
This composition may be used for wire coatings, in particular for passenger car tires, with the benefit of reducing hysteresis or rebound and with the aim to reduce rolling resistance in tires.
Data Source
AI summary
In accordance with the invention a wire coat rubber composition for a tire comprises from 70 phr to 100 phr of cis 1,4-polyisoprene rubber, from 0 phr to 30 phr of solution styrene butadiene rubber, from 65 phr to 95 phr pre-silanized precipitated silica, from 0.1 phr to 5 phr of a cobalt salt, up to 15 phr carbon black, up to 10 phr of a resin, and up to 10 phr oil. Further the present invention is directed to a tire comprising such a wire coat composition.