Reactive Extruder Feeding for Homogeneous Functionalized Rubber Blends
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Solution Overview
Problem
Current methods for blending EPDM and high-diene rubber to create functionalized polymers with desirable properties for tire tread applications are inefficient, leading to poor tack properties and inconsistent tire performance due to incompatibility issues and the need for costly vulcanization systems.
Innovation Solution
A reactive extrusion process using an extruder system with intermeshing screws and a rubber feeder to form a polymer melt, introducing a coupling agent, and utilizing a twin screw melt pump to reduce cross-linking, resulting in functionalized polymers with improved wet traction, rolling resistance, and wear resistance without the need for fillers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If simple blends of EPDM or butyl rubber with high-diene rubber are used, then the production process is simple, but the blend results in heterogeneous mixtures with poor tack properties and poor properties
Solution Approach 1:
A coupling agent is introduced as an intermediary substance between EPDM/butyl rubber and high-diene rubber to facilitate compatibility. The coupling agent modifies the interface between the two rubber phases, enabling better adhesion and homogeneity without requiring complex vulcanization systems or batch mixing processes.
Solution Approach 2:
The invention changes the chemical parameters of the rubber blend by introducing a coupling agent that modifies the surface properties and compatibility between EPDM/butyl rubber and high-diene rubber. This parameter change enables the formation of a homogeneous mixture with improved tack properties while maintaining processing simplicity.
2Ease of manufacture
If functionalized polymers are formed using a batch mixer, then the process is straightforward, but controlling batch temperature and reaction end is difficult, particularly with larger batch mixer sizes
Solution Approach 1:
The batch mixing process is segmented into a continuous extrusion process with multiple zones. The extruder divides the functionalization process into distinct sections: feeding zone, melting zone, mixing zone with coupling agent addition, and discharge zone. This segmentation enables precise temperature and reaction control at each stage, eliminating the temperature control difficulties of large batch mixers.
Solution Approach 2:
The polymer is pre-melted in a melt feeder before entering the extruder, and the coupling agent is pre-positioned to be added at a specific location within the extruder. This preliminary action ensures that temperature and reaction conditions are optimized from the start, enabling precise control of the functionalization process.
3Reliability
If special vulcanization systems and special accelerators are used to achieve optimum vulcanization of both phases, then vulcanization quality improves, but the cost increases and the improvements are not sufficient to justify their cost
Solution Approach 1:
The coupling agent serves as a mediator that enables effective vulcanization of both EPDM/butyl rubber and high-diene rubber phases without requiring special vulcanization systems or accelerators. The coupling agent creates compatible interfaces that allow standard vulcanization processes to achieve optimum results for both rubber types simultaneously.
Solution Approach 2:
The invention changes the chemical composition parameters by incorporating a coupling agent that modifies the vulcanization behavior of the rubber blend. This parameter change enables both rubber phases to achieve optimum vulcanization under standard conditions, eliminating the need for costly special vulcanization systems and accelerators.
4Reliability
If the extruder process introduces a coupling agent at a second location after polymer melt formation, then the coupling agent can be properly incorporated, but the process requires multiple introduction points increasing system complexity
Solution Approach 1:
The extruder system is segmented into functional zones with dedicated introduction points: polymer melt formation zone, coupling agent addition zone, and mixing zone. This segmentation allows the coupling agent to be introduced at the optimal location for maximum incorporation efficiency while maintaining a manageable system complexity through modular zone design.
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 process produces functionalized polymers that enhance tire tread performance by improving wet traction, rolling resistance, and maintaining wear resistance while reducing filler-related issues like cracking initiation and propagation.
Implementation Method 1
extruding the polymer melt through the extruder via a plurality of intermeshing screws disposed within the extruder
Implementation Method 2
extruding the polymer melt through the extruder via a plurality of intermeshing screws disposed within the extruder
Implementation Method 3
introducing a coupling agent to the extruder at a second location of the extruder
Data Source
AI summary
The present disclosure relates to a method of forming a composition including forming a polymer melt in a melt feeder. The melt feeder is coupled with an extruder. The method includes introducing the polymer melt from the melt feeder to the extruder at a first location of the extruder. The method includes extruding the polymer melt through the extruder via a plurality of intermeshing screws disposed within the extruder. The method includes introducing a coupling agent to the extruder at a second location of the extruder.