Alternating Electric Field Devulcanization of Rubber
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Solution Overview
Problem
Existing devulcanization techniques for vulcanized rubber are inefficient in achieving uniform devulcanization, leading to uneven heating and varying degrees of devulcanization within rubber particles, making it difficult to recycle rubber products effectively.
Innovation Solution
Applying an alternating electric field with a frequency of 1 to 100 MHz and voltage of 1000 to 10,000 V to vulcanized crosslinked elastomer particles, optionally combined with fresh unvulcanized elastomer, to break sulfur crosslinks and devulcanize the rubber uniformly, using a devulcanization apparatus with electrodes to generate and apply the electric field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional devulcanization techniques (microwave, ultrasonic, thermal) are used, then some devulcanization effect is achieved, but uniform heating and uniform devulcanization throughout the rubber particles cannot be achieved
Solution Approach 1:
The patent replaces conventional microwave, ultrasonic, or thermal heating systems with an alternating electric field system operating at 1 to 100 MHz. This substitution enables uniform energy distribution throughout the rubber particles through dielectric heating, achieving uniform devulcanization without the heating non-uniformity problems of conventional methods. The electric field directly interacts with the polar groups in the rubber molecules, producing consistent thermal effects throughout the material volume.
Solution Approach 2:
The patent changes the physical parameters of the heating system by operating at specific frequency ranges (1 to 100 MHz) and voltage levels (1000 to 10,000 V). These parameter changes optimize the dielectric heating effect to achieve uniform energy penetration and distribution throughout the rubber particles, resolving the heating uniformity issue while maintaining effective devulcanization.
2Productivity
If high voltage and frequency electric field is applied to break sulfur crosslinks, then devulcanization efficiency improves, but energy consumption increases
Solution Approach 1:
The patent employs periodic alternating electric fields at frequencies of 1 to 100 MHz to break sulfur crosslinks. The periodic nature of the field allows for controlled energy delivery, where the alternating polarity prevents excessive energy accumulation while maintaining effective bond breaking. This periodic action achieves high devulcanization efficiency without the excessive energy consumption that would result from continuous high-voltage application.
Solution Approach 2:
The patent uses dynamic alternating electric fields with adjustable frequencies and voltages to optimize the devulcanization process. By dynamically adjusting the field parameters within the specified ranges, the system maintains high devulcanization efficiency while adapting energy consumption to the actual needs of the rubber material, preventing excessive energy use.
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 achieves uniform devulcanization of rubber particles, allowing for their reprocessing and reuse by reducing sulfur crosslinks, resulting in improved properties and increased recyclability of rubber materials.
Implementation Method 1
applying an alternating electric field to the composition comprising the vulcanized crosslinked elastomer particles, the alternating electric field having a frequency and voltage sufficient to devulcanize the crosslinked elastomer particles
Data Source
AI summary
A devulcanization apparatus for devulcanizing a plurality of cross-linked elastomer particles. The apparatus includes a first conveyor functioning as a high voltage electrode and a second conveyor functioning as a ground electrode. A generator is operable to apply an alternating electric field between the first and second conveyors. A devulcanization region is provided between the first and second conveyors in which the cross-linked elastomer particles are placed.