Silica-Polymer Bonding in Rubber Tyre Compounds
Solution Overview
Problem
Existing rubber tyre compounds face challenges in achieving optimal interaction between silica reinforcing filler and polymer base, leading to subpar rolling and abrasion resistance, particularly due to premature curing and reduced adhesion issues when using certain chemical additives in excess.
Innovation Solution
A rubber tyre compound production method involving a specific mixing process with a cross-linking polymer base, silica, a silane bonding agent, and a chemical of general formula (I) in controlled amounts, along with stearic acid and a curing system, to enhance the interaction between silica and polymer, while avoiding excessive viscosity and adhesion problems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If over 5 phr of the chemical of general formula (I) is used, then the interaction between silica and polymer base is improved, but premature curing problems occur during extrusion
Solution Approach 1:
The patent optimizes the concentration parameter of the chemical of general formula (I) to a specific range (0.6 to less than 5 phr), transforming the qualitative interaction improvement into a quantifiable parameter optimization that avoids premature curing while maintaining enhanced silica-polymer interaction
2Strength
If over 5 phr of the chemical of general formula (I) is used, then the interaction between silica and polymer base is improved, but the viscosity of the compound increases
Solution Approach 1:
The patent establishes an optimal concentration range (0.6 to less than 5 phr) for the chemical of general formula (I) that balances the competing requirements of enhancing silica-polymer interaction while maintaining manageable compound viscosity for processing
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 method results in improved rolling resistance and abrasion resistance, with better chemical bonding between silica and polymer, as demonstrated by reduced 60°C tanδ values and increased bound rubber content, outperforming standard methodologies and control compounds.
Implementation Method 1
silanes which interact with the silanol groups of silica to prevent its particles from forming hydrogen bonds. With the right functionality, silanes may also interact with the polymer base to form a chemical bridge between it and the silica
Implementation Method 2
prevent its particles from forming hydrogen bonds
Implementation Method 3
a mixing step, in which at least one cross-linking, unsaturated-chain polymer base, silica, a silane bonding agent, and 0.6 to less than 5 phr of a chemical of general formula (I) are mixed with one another
Data Source
AI summary
A rubber tyre compound production method having a mixing step, in which at least one cross-linking, unsaturated-chain polymer base, silica, a silane bonding agent, and 0.6 to 5 phr of a chemical of general formula (I) are mixed with one another; and a following mixing step, in which at least stearic acid and a curing system are added to and mixed with the compound being prepared; (I) wherein : R1, R2 and R3, which are the same or different, are chosen from the group consisting of: hydrogen and groups in the alkane, alkene, cycloalkane, heterocyclic compound, aromatic compound, amine, imine, amide, sulphide, alcohol, aldehyde, ketone, ether, ester, nitrile, nitro-derivative, and isocyanate families.