Conjugated Diene Rubber Microstructure Control for Tire Performance
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Solution Overview
Problem
Current methods for producing conjugated diene rubbers do not adequately meet the demands for tires with superior low-heat-generating properties, wet-grip properties, and strength, as they fail to achieve the desired balance in fuel efficiency and safety standards.
Innovation Solution
A method involving the formation of polymer blocks A and B through specific polymerization reactions, followed by reaction with a denaturant having multiple epoxy or alkoxy groups, to create a conjugated diene polymer chain with an active terminal, which is then used to produce a rubber with enhanced affinity for silica, resulting in improved tire performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional carbon black is used as filler in rubber composition, then tire strength is maintained, but low-heat-generating properties deteriorate
Solution Approach 1:
The invention changes the chemical parameters of the rubber polymer by controlling the microstructure (cis-1,4 content, vinyl content) and introducing specific functional groups through denaturants. This allows the rubber to have superior affinity for silica filler, enabling the use of silica instead of carbon black while maintaining strength and improving heat generation properties
Solution Approach 2:
The invention creates a composite rubber material that combines conjugated diene polymer chains with specific microstructure and denaturant-derived functional groups. This composite structure provides both the mechanical strength needed for tires and the low-heat-generating properties required for fuel efficiency
2Use of energy by moving object
If silica is used as filler to improve low-heat-generating properties, then fuel efficiency improves, but wet-grip properties and strength may deteriorate
Solution Approach 1:
The invention modifies the rubber's chemical parameters by introducing denaturants with epoxy or alkoxy groups that create strong chemical bonding sites. This enhanced chemical affinity ensures silica filler is effectively bound to the rubber matrix, maintaining wet-grip properties and strength while achieving low-heat-generating properties for improved fuel efficiency
3Ease of manufacture
If conventional polymerization methods are used, then production simplicity is maintained, but desired microstructure and performance characteristics cannot be achieved
Solution Approach 1:
The invention segments the polymerization process into distinct stages: first forming polymer block (A) with specific isoprene content and active terminal, then forming polymer block (B) with butadiene content. This segmented approach allows precise control of microstructure while maintaining a relatively simple two-stage production process
Solution Approach 2:
The invention performs preliminary actions by first creating polymer blocks with active terminals through controlled polymerization, then subsequently introducing denaturants. This preliminary formation of reactive sites enables precise microstructure control and functional group introduction without complicating the overall manufacturing process
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 produces a conjugated diene rubber that significantly enhances tire performance by providing superior low-heat-generating properties, wet-grip properties, and strength, making it suitable for fuel-efficient and safe automotive tires.
Implementation Method 1
forming a polymer block (A) by using a polymerization initiator in an inert solvent
Implementation Method 2
the polymer block (B) being formed continuously with the polymer block (A) through the continuation of a polymerization reaction
Implementation Method 3
bringing a specific amount of a predetermined denaturant into reaction with the active terminal of the conjugated diene polymer chain
Data Source
AI summary
A method for producing a conjugated diene rubber is provided which includes the steps of: (a) forming a polymer block (A) by using a polymerization initiator in an inert solvent, the polymer block (A) having an active terminal and containing a specific amount of an isoprene monomeric unit and a specific amount of an aromatic vinyl monomeric unit; (b) forming a polymer block (B) having an active terminal and containing a specific amount of a 1,3-butadiene monomeric unit and, as needed, a specific amount of an aromatic vinyl monomeric unit, thereby obtaining a conjugated diene polymer chain having an active terminal and having the polymer block (A) and a polymer block (B); (c) bringing a specific amount of a predetermined denaturant into reaction with the active terminal of the conjugated diene polymer chain having the active terminal.