Conjugated Diene Polymer Functionalization for Tire Performance
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Solution Overview
Problem
Current methods for producing conjugated diene polymers do not adequately address the need for enhanced low fuel consumption performance in automobile tires, particularly in terms of hysteresis loss characteristics, wet skid resistance, and wear resistance, under conditions of rising fuel costs and environmental concerns.
Innovation Solution
A method involving the polymerization of conjugated diene compounds with aromatic vinyl compounds in the presence of specific functional groups and alkali metal compounds, followed by modification with silane compounds and onium-forming agents, to produce a crosslinked polymer with improved physical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional emulsion polymerization methods are used to produce conjugated diene polymers, then the production process is simple and well-established, but the low fuel consumption performance and hysteresis loss characteristics are insufficient
Solution Approach 1:
The patent introduces functional groups (such as amino groups, hydroxyl groups, or carboxyl groups) into the polymer chain during the polymerization step, before the rubber is actually used in tire applications. This preliminary modification enables the rubber to exhibit excellent low fuel consumption performance and low hysteresis loss characteristics without requiring complex post-processing steps.
Solution Approach 2:
The patent changes the chemical structure parameters of the conjugated diene polymer by incorporating specific functional groups and controlling the polymerization conditions (such as using organometallic catalysts and controlling molecular weight distribution). These parameter changes result in improved hysteresis loss characteristics and low fuel consumption performance while maintaining a relatively simple polymerization process.
2Loss of energy
If existing modified diene polymers are used to improve wet skid resistance and wear resistance, then these specific properties are enhanced, but the low fuel consumption performance remains inadequate
Solution Approach 1:
The patent develops a conjugated diene polymer with multi-functional characteristics: it simultaneously provides excellent wet skid resistance, wear resistance, and low fuel consumption performance. This is achieved by incorporating specific functional groups (amino, hydroxyl, or carboxyl groups) and controlling the molecular structure during polymerization, making the rubber applicable to various tire components requiring multiple performance attributes.
Solution Approach 2:
The patent creates a composite polymer structure by combining conjugated diene units with functional group-containing units in the same polymer chain. This composite structure enables the material to exhibit multiple desirable properties including improved interaction with silica and carbon black (enhancing wet skid resistance and wear resistance) while simultaneously achieving low hysteresis loss and low fuel consumption performance.
3Strength
If the polymer structure is modified to enhance interactions with silica and carbon black for improved wear resistance, then fracture characteristics and wear resistance improve, but the production complexity increases
Solution Approach 1:
The patent incorporates functional groups (amino, hydroxyl, or carboxyl groups) into the polymer chain during the polymerization step, before the rubber is compounded with silica and carbon black. This preliminary action enables the polymer to interact effectively with these fillers, improving fracture characteristics and wear resistance without requiring complex post-polymerization modification steps.
Solution Approach 2:
The patent combines the polymerization step with the introduction of functional groups that enhance filler interaction. By merging these functions into a single polymerization process using organometallic catalysts, the patent achieves improved fracture characteristics and wear resistance while avoiding separate, complex modification steps that would increase production complexity.
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 resulting crosslinked polymer exhibits excellent low hysteresis loss characteristics, wet skid resistance, and wear resistance, thereby enhancing the low fuel consumption performance of automobile tires.
Implementation Method 1
polymerizing a conjugated diene monomer or a conjugated diene monomer and an aromatic vinyl monomer in a hydrocarbon solvent in the presence of an alkali metal catalyst to obtain an active polymer having an alkali metal end
Implementation Method 2
performing a secondary modification reaction in which the hydrocarbyloxysilane compound is reacted through a condensation reaction of hydrocarbyloxysilyl groups with each other
Data Source
AI summary
A method for producing a modified conjugated diene polymer, comprises polymerizing (i) a monomer comprising a conjugated diene compound, or (ii) a monomer comprising a conjugated diene compound and an aromatic vinyl compound, in the presence of: at least one compound selected from the group consisting of formulae (1) and (2), and an alkali metal compound or an alkaline earth metal compound. A1 is a functional group which has a hydrocarbylsilyl group in which three hydrogen atoms in a —SiH3 structure are each substituted by a hydrocarbyl group; has at least one atom selected from the group consisting of N, P and S; and has no active hydrogen and is bound to R1 by any one atom of the N, P and S. R1 and R2 are hydrocarbylene groups.