WO2023080859A1 - A method of devulcanizing waste rubber in hydrothermal environment - Google Patents

A method of devulcanizing waste rubber in hydrothermal environment Download PDF

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Publication number
WO2023080859A1
WO2023080859A1 PCT/TR2021/051149 TR2021051149W WO2023080859A1 WO 2023080859 A1 WO2023080859 A1 WO 2023080859A1 TR 2021051149 W TR2021051149 W TR 2021051149W WO 2023080859 A1 WO2023080859 A1 WO 2023080859A1
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WIPO (PCT)
Prior art keywords
rubber
devulcanization
reactor
rubbers
waste
Prior art date
Application number
PCT/TR2021/051149
Other languages
French (fr)
Inventor
Erdem MUTLU
Original Assignee
Icarbon Ki̇mya Arge Mühendi̇sli̇k Sanayi̇ Ve Ti̇caret Li̇mi̇ted Şi̇rketi̇
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Publication of WO2023080859A1 publication Critical patent/WO2023080859A1/en

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J11/00—Recovery or working-up of waste materials
    • C08J11/04—Recovery or working-up of waste materials of polymers
    • C08J11/10—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation
    • C08J11/14—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation by treatment with steam or water
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B29B17/04—Disintegrating plastics, e.g. by milling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B29B17/04—Disintegrating plastics, e.g. by milling
    • B29B17/0404—Disintegrating plastics, e.g. by milling to powder
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B29B17/04—Disintegrating plastics, e.g. by milling
    • B29B2017/0424—Specific disintegrating techniques; devices therefor
    • B29B2017/0428—Jets of high pressure fluid
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2319/00—Characterised by the use of rubbers not provided for in groups C08J2307/00 - C08J2317/00
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/62—Plastics recycling; Rubber recycling

Definitions

  • the present invention relates to a method to devulcanize waste rubber in hydrothermal environment.
  • Patent and literature research conducted for the state of the art shows that there are various patent application documents.
  • the international patent application with publication number WO2011158024 A1 contains a method for the devulcanization of a rubber material; the method comprises contacting the rubber material with carbon dioxide and an additive selected from dithiocarbamates, thiazoles, guanidines, thiurams, sulfenamides and mixtures thereof.
  • EP3169769 A1 is related to the bacterial devulcanization process of rubber particles with Acidithiobacillus ferrooxidans strain.
  • the present invention relates to a method developed for the devulcanization of waste rubbers in hydrothermal environment, which meets the requirements mentioned above, eliminates all disadvantages and brings some additional advantages.
  • the main purpose of the invention is to create a method that allows the vulcanized rubber to be devulcanized easily without the need for the methods in the state of the art.
  • the devulcanization of waste rubber offers the advantage of making the rubber suitable for reformulation and reuse without damaging the rubber's core polymer chain.
  • Recycled rubber can be reused for its original purpose, not just as a filler.
  • devulcanized rubber can be used again at higher levels in applications with high performance requirements. For example, they can be widely used in the manufacture of tire, sealants, hoses, conveyor belts, thermoplastic elastomers and belts. With the method in question, all rubbers vulcanized with pure sulfur or all vulcanisates containing sulfur can be devulcanized.
  • These rubbers are; polyisoprene rubber (IR), natural rubber (NR), polybutadiene rubber (BR), ethylene-propylene rubber (EPR), styrene-butadiene rubber (SBR), nitrile butadiene rubber (NBR), isobutene isoprene rubber (HR), hydrogenated nitrile butadiene rubber (HNBR), ethylene- propylene-diene monomer rubber (EPDM), polychloroprene rubber (CR), polyurethanes, chlorosulfonated polyethylene (CSM), acrylic rubbers (ACM).
  • IR polyisoprene rubber
  • NR natural rubber
  • BR polybutadiene rubber
  • EPR ethylene-propylene rubber
  • SBR styrene-butadiene rubber
  • NBR nitrile butadiene rubber
  • HR isobutene isoprene rubber
  • HNBR hydrogenated nitrile butadiene rubber
  • EPDM
  • this invention relates to a commercially viable method for recycling rubber.
  • the technique of this invention comprising the steps of grinding the waste rubbers to particle size of 0 - 50 mm and then devulcanizing the rubber pieces in a hydrothermal (water) environment. It has been discovered that, with the aforesaid technique, devulcanized rubber can be mixed with untreated (vulcanized) rubber and re-vulcanized with it.
  • the rubber devulcanized with the method of invention offers a significant commercial advantage.
  • One of these advantages is the low cost of the devulcanization procedure, and the other is the reduction in raw material inputs of enterprises that reuse devulcanized rubbers.
  • the method that is the subject of the invention reduces the carbon footprint of the companies and offers advantages that will lead them to a greener production.
  • the said devulcanization process is carried out in the presence of water, by heating the vulcanized rubber under a pressure of at least 150 bar, to a temperature of at least about 150 'C and in ambient conditions where the ru bber / water ratio is at least 1/10 by volume.
  • the invention also allows the waste rubbers devulcanized by being brought to 0 - 50 mm dimensions, to be recombined and recycled into high performance rubber products.
  • the temperature is not higher than about 300 ID in order to minimize the p olymer degradation level.
  • hydrothermal devulcanization is the process of breaking down the mono-sulfidic (CSC), di-sulfidic (CSSC) and poly-sulfidic (C-Sx-C) crosslinks of vulcanized rubber and it leaves the backbone of the rubber polymer molecules intact.
  • CSC mono-sulfidic
  • CSSC di-sulfidic
  • C-Sx-C poly-sulfidic
  • devulcanized rubber can be recombined in much the same way as the original rubber and used as useful products.
  • rubber compounds containing approximately 40 phr (the ratio of rubber per hundredweight) can be made and can be used in the manufacture of high-performance rubber products.
  • Rubber compound formulas can be made by blending devulcanized rubber (about 10 phr to 40 phr) with unvulcanized rubber (60 phr to 90 phr). Waste rubbers consisting of the rubbers mentioned below can be devulcanized and reblended with their originals:
  • EPR Ethylene-Propylene Rubber
  • SBR Styrene-Butadiene Rubber
  • NBR Nitrile Butadiene Rubber
  • HNBR Hydrogenated Nitrile Butadiene Rubber
  • EPDM Ethylene-Propylene-Diene Monomer Rubber
  • CSM Chlorosulfonated Polyethylene
  • the present invention is a method developed for the devulcanization of waste rubbers in hydrothermal environment comprising the steps of;
  • the present invention relates to a method developed to enable the devulcanization of waste rubbers in hydrothermal environment.
  • the first step of the method is sizing.
  • the sizing process is carried out by a system or device that performs mechanical, cryogenic or water jet cutting. Particle size distribution is quite important for compound production after devulcanization. Therefore, before the devulcanization the waste rubber pieces should be formed into below 50 microns particle sizes in the sizing process step. Particle sizes above 50 microns negatively affect the efficiency of the invention.
  • rubber pieces are placed in a high-pressure steel reactor with a rubber/water ratio of at least 1/10 by volume. In this step, the pressure applied in a hydrothermal system is in the range of 150 - 250 bar.
  • the temperature settings are adjusted to at least 150 °C after the system is turned off. This temperature is necessary for the reactor to be heated during the process and for the process to take place at the desired temperatures.
  • the said temperature can be provided by an external heating system. In addition to those, care is taken to keep the pressure of the system in the pressure range of 150 - 250 bar.
  • the total operating time of the system should not exceed 6 hours. This duration is preferably in the range of 2 - 6 hours. The duration can be kept with an external or internal timer.
  • the rubber particle sizes specified in the method of the invention include one of the following rubbers: polyisoprene rubber (IR), natural rubber (NR), polybutadiene rubber (BR), ethylene-propylene rubber (EPR), styrene-butadiene rubber (SBR), nitrile butadiene rubber (NBR), isobutene isoprene rubber (HR), hydrogenated nitrile butadiene rubber (HNBR), ethylene-propylene-diene monomer rubber (EPDM), polychloroprene rubber (CR), polyurethanes, chlorosulfonated polyethylene (CSM), acrylic rubber (ACM) rubbers.
  • IR polyisoprene rubber
  • NR natural rubber
  • BR polybutadiene rubber
  • EPR ethylene-propylene rubber
  • SBR styrene-butadiene rubber
  • NBR nitrile butadiene rubber
  • HR isobutene isoprene rubber
  • HNBR

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  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Sustainable Development (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

The present invention relates to a method developed to devulcanize waste rubbers in hydrothermal environment, which consist of steps such as sizing of waste rubber pieces below 50 microns particle sizes before devulcanization, placing rubber pieces in a reactor that has a stirrer in the range of 150-250 bar and 0-500 rpm rotating speed with rubber / water ratio is at least 1/10 by volume and operating the reactor at a temperature of at least 150 ºC for a maximum of 6 hours.

Description

A METHOD OF DEVULCANIZING WASTE RUBBER IN HYDROTHERMAL ENVIRONMENT
Technical Field
The present invention relates to a method to devulcanize waste rubber in hydrothermal environment.
Background of the Method
Every year, millions of used car tires, hoses, belts and other rubber products are thrown away after completing their lifespan. These used rubber products are taken to landfills or cement factories to be incinerated after fulfilling their intended use. A limited amount of waste rubber is used in applications like rubber asphalt filling, playground floors and other similar applications. However, the amount of the waste rubber annually generated, exceeds the demand in these field of applications.
It is known that the recycling of devulcanized rubber products is an extremely difficult problem. The problem with the recycling of devulcanized rubber products arises from the crosslinking of rubber with sulfur in the devulcanization process. After the devulcanization process, the crosslinked rubber becomes thermoset and it cannot be transformed into other products. Chemical, microwave-assisted, ultrasonic-based, supercritical carbon dioxide-based, thermo-mechanical and biological devulcanization are among the methods that is used to devulcanize the vulcanized rubber mentioned before. As well as each application mentioned has its own characteristics, their practices are quite difficult. Thermo-mechanical devulcanization is the most common method that has been used. This method is linked with a mechanical shear and rapidly increasing temperature. The fact that the rubber temperature cannot be controlled exactly in the system causes the rubber to be heated more. Solvents such as hexane, butanol, acetone, which can be harmful to the environment, can be added in for the system to function effectively. For example, the chemicals used in chemical devulcanization are harmful to the environment. Microwave-assisted devulcanization involves high energy usage. Machine investment costs are quite high in ultrasonicbased devulcanization. In thermomechanical devulcanization, the chemical structure of the product loses its required qualities that has been used in devulcanization. On the other hand, the efficiency of the bacterial systems used in biological devulcanization is still a controversial issue.
Patent and literature research conducted for the state of the art shows that there are various patent application documents.
An international patent application with publication number W02012134266 A3 mentions a devulcanizing agent and a process for recycling rubber. The application in question is an example of chemical devulcanization. Excessive use of chemicals causes both financial and environmental problems.
The patent document with publication number NL2020302 B1 discloses the use of p- Phenylenediamine compound as a devulcanization agent.
In the European patent application with the publication number EP2528724 A1 it is mentioned that the devulcanization is carried out in the extruder machine.
The international patent application with publication number WO2011158024 A1 contains a method for the devulcanization of a rubber material; the method comprises contacting the rubber material with carbon dioxide and an additive selected from dithiocarbamates, thiazoles, guanidines, thiurams, sulfenamides and mixtures thereof.
The patent application GB2028835 A mentions the process of devulcanizing rubber pieces by passing them through the microwave field.
The European patent application with publication number EP3169769 A1 is related to the bacterial devulcanization process of rubber particles with Acidithiobacillus ferrooxidans strain.
In conclusion, due to the problems described above and the inadequacy of the existing solutions on the subject, it has been necessary to make an improvement in the relevant technical field. Summary of the Invention
The present invention relates to a method developed for the devulcanization of waste rubbers in hydrothermal environment, which meets the requirements mentioned above, eliminates all disadvantages and brings some additional advantages.
The main purpose of the invention is to create a method that allows the vulcanized rubber to be devulcanized easily without the need for the methods in the state of the art. The devulcanization of waste rubber offers the advantage of making the rubber suitable for reformulation and reuse without damaging the rubber's core polymer chain. Recycled rubber can be reused for its original purpose, not just as a filler. In other words, devulcanized rubber can be used again at higher levels in applications with high performance requirements. For example, they can be widely used in the manufacture of tire, sealants, hoses, conveyor belts, thermoplastic elastomers and belts. With the method in question, all rubbers vulcanized with pure sulfur or all vulcanisates containing sulfur can be devulcanized. These rubbers are; polyisoprene rubber (IR), natural rubber (NR), polybutadiene rubber (BR), ethylene-propylene rubber (EPR), styrene-butadiene rubber (SBR), nitrile butadiene rubber (NBR), isobutene isoprene rubber (HR), hydrogenated nitrile butadiene rubber (HNBR), ethylene- propylene-diene monomer rubber (EPDM), polychloroprene rubber (CR), polyurethanes, chlorosulfonated polyethylene (CSM), acrylic rubbers (ACM).
It is an objective of the present invention to introduce a method that uses a hydrothermal devulcanization technique, which has no environmental impact and adopts the principles of green chemistry. Large-scale commercial application of this method could be used to recycle large volumes of waste tires and other rubber products that are already thrown into landfills or have to be used in polluting applications. In this sense, this invention relates to a commercially viable method for recycling rubber. The technique of this invention comprising the steps of grinding the waste rubbers to particle size of 0 - 50 mm and then devulcanizing the rubber pieces in a hydrothermal (water) environment. It has been discovered that, with the aforesaid technique, devulcanized rubber can be mixed with untreated (vulcanized) rubber and re-vulcanized with it. The rubber devulcanized with the method of invention offers a significant commercial advantage. One of these advantages is the low cost of the devulcanization procedure, and the other is the reduction in raw material inputs of enterprises that reuse devulcanized rubbers. Furthermore, the method that is the subject of the invention reduces the carbon footprint of the companies and offers advantages that will lead them to a greener production.
It is another objective of the present invention to obtain a devulcanization method that provides a green and environment-friendly process for the recycling of waste rubbers. The said devulcanization process is carried out in the presence of water, by heating the vulcanized rubber under a pressure of at least 150 bar, to a temperature of at least about 150 'C and in ambient conditions where the ru bber / water ratio is at least 1/10 by volume. The invention also allows the waste rubbers devulcanized by being brought to 0 - 50 mm dimensions, to be recombined and recycled into high performance rubber products. In the method of the invention, it is preferred that the temperature is not higher than about 300 ID in order to minimize the p olymer degradation level. In other words, if the devulcanization process is carried out at a temperature less than about 300 O, the sulfur - sulfur and/or carbon - sulfur bonds in the vulcanized rubber, and in some cases the carbon - carbon bonds, may be broken. Therefore, hydrothermal devulcanization is the process of breaking down the mono-sulfidic (CSC), di-sulfidic (CSSC) and poly-sulfidic (C-Sx-C) crosslinks of vulcanized rubber and it leaves the backbone of the rubber polymer molecules intact. Thus, the molecular weight of the rubber can be maintained at a high level by devulcanization at 300 'C or less. Therefore, the devulcanization process should typically be performed at a temperature in the range of about 1500 to about 3000.
It is also another objective of the present invention to provide a devulcanization method which allows the rubber to be used in the same type of applications as the original rubber without significantly changing the microstructure of it. In other words, devulcanized rubber can be recombined in much the same way as the original rubber and used as useful products.
From the devulcanized rubbers obtained as a result of the devulcanization process carried out within the scope of the invention, rubber compounds containing approximately 40 phr (the ratio of rubber per hundredweight) can be made and can be used in the manufacture of high-performance rubber products. Rubber compound formulas can be made by blending devulcanized rubber (about 10 phr to 40 phr) with unvulcanized rubber (60 phr to 90 phr). Waste rubbers consisting of the rubbers mentioned below can be devulcanized and reblended with their originals:
• Polyisoprene Rubber (IR),
• Natural Rubber (NR),
• Polybutadiene Rubber (BR),
• Ethylene-Propylene Rubber (EPR),
• Styrene-Butadiene Rubber (SBR),
• Nitrile Butadiene Rubber (NBR),
• Isobutene Isoprene Rubber (HR),
• Hydrogenated Nitrile Butadiene Rubber (HNBR),
• Ethylene-Propylene-Diene Monomer Rubber (EPDM),
• Polychloroprene Rubber (CR),
• Polyurethanes,
• Chlorosulfonated Polyethylene (CSM),
• Acrylic Rubber (ACM)
In order to solve the existing problems in the technical field and to fulfill the mentioned objectives, the present invention is a method developed for the devulcanization of waste rubbers in hydrothermal environment comprising the steps of;
• Sizing of waste rubber pieces below 50 microns particle sizes before devulcanization,
• Placing rubber pieces in a reactor that has a stirrer in the range of 150-250 bar and 0-500 rpm rotating speed, in such a way that rubber / water ratio is at least 1/10 by volume and operating the reactor at a temperature of at least 150 ‘C for a maximum of 6 hours
The structural and characteristic features of the invention and all its advantages will be understood more clearly thanks to the detailed explanation given below, and therefore the evaluation should be made by considering the detailed explanation in question. DETAILED DESCRIPTION OF THE INVENTION
In this detailed explanation, the preferred applications of the method developed for the devulcanization of waste rubbers, which are the subject of the invention, in hydrothermal medium are explained only for a better understanding of the subject.
The present invention relates to a method developed to enable the devulcanization of waste rubbers in hydrothermal environment. The first step of the method is sizing. The sizing process is carried out by a system or device that performs mechanical, cryogenic or water jet cutting. Particle size distribution is quite important for compound production after devulcanization. Therefore, before the devulcanization the waste rubber pieces should be formed into below 50 microns particle sizes in the sizing process step. Particle sizes above 50 microns negatively affect the efficiency of the invention. In the next step, rubber pieces are placed in a high-pressure steel reactor with a rubber/water ratio of at least 1/10 by volume. In this step, the pressure applied in a hydrothermal system is in the range of 150 - 250 bar.
In order to ensure that the system operates in an inert atmosphere, nitrogen must be supplied to the system during the operating hours of the reactor in question. The temperature settings are adjusted to at least 150 °C after the system is turned off. This temperature is necessary for the reactor to be heated during the process and for the process to take place at the desired temperatures. The said temperature can be provided by an external heating system. In addition to those, care is taken to keep the pressure of the system in the pressure range of 150 - 250 bar. The total operating time of the system should not exceed 6 hours. This duration is preferably in the range of 2 - 6 hours. The duration can be kept with an external or internal timer. After all steps are completed, there is a drying process to remove water from the devulcanized rubber. The said drying process is carried out in the temperature range of 100-150 cC.
The rubber particle sizes specified in the method of the invention include one of the following rubbers: polyisoprene rubber (IR), natural rubber (NR), polybutadiene rubber (BR), ethylene-propylene rubber (EPR), styrene-butadiene rubber (SBR), nitrile butadiene rubber (NBR), isobutene isoprene rubber (HR), hydrogenated nitrile butadiene rubber (HNBR), ethylene-propylene-diene monomer rubber (EPDM), polychloroprene rubber (CR), polyurethanes, chlorosulfonated polyethylene (CSM), acrylic rubber (ACM) rubbers.

Claims

8
CLAIMS A method for the devulcanization of waste rubbers in hydrothermal environment comprising the steps of; a. Sizing of waste rubber pieces below 50 microns particle sizes before devulcanization, b. Placing rubber pieces in a reactor that has a stirrer in the range of 150-250 bar and 0-500 rpm rotating speed, in such a way that rubber / water ratio is at least 1/10 by volume and operating the reactor at a temperature of at least 150 'C for a maximum of 6 hours A method according to claim 1 , characterized in that the method further comprising a step of sizing process is carried out by a system or device that performs mechanical, cryogenic or water jet cutting. A method according to claim 1 or claim 2, characterized in that; including one of the following rubbers: polyisoprene rubber (IR), natural rubber (NR), polybutadiene rubber (BR), ethylene-propylene rubber (EPR), styrenebutadiene rubber (SBR), nitrile butadiene rubber (NBR), isobutene isoprene rubber (HR), hydrogenated nitrile butadiene rubber (HNBR), ethylene- propylene-diene monomer rubber (EPDM), polychloroprene rubber (CR), polyurethanes, chlorosulfonated polyethylene (CSM), acrylic rubber (ACM) rubbers. A method according to any preceding claim, characterized in that; operating the reactor at a maximum temperature of 300 'C. A method according to any one of the above claims characterized in that; operating the reactor with a stirrer that can rotate at 0-500 rpm for 2-6 hours includes the process step.
PCT/TR2021/051149 2021-11-03 2021-11-05 A method of devulcanizing waste rubber in hydrothermal environment WO2023080859A1 (en)

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Application Number Priority Date Filing Date Title
TR2021/017115 2021-11-03
TR2021/017115A TR2021017115A2 (en) 2021-11-03 2021-11-03 A METHOD FOR DEVULCANIZING WASTE RUBBER IN HYDROTHERMAL ENVIRONMENT

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4148763A (en) * 1978-07-20 1979-04-10 The Goodyear Tire & Rubber Company Reclaim oil for digester process for rubber reclaiming
EP3045492A1 (en) * 2015-01-19 2016-07-20 Lehigh Technologies, Inc. Recycled micronized rubber formulation having improved abrasion resistance
WO2021141750A1 (en) * 2020-01-07 2021-07-15 Coe William B Method for preparing a recycled rubber-based elastomer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4148763A (en) * 1978-07-20 1979-04-10 The Goodyear Tire & Rubber Company Reclaim oil for digester process for rubber reclaiming
EP3045492A1 (en) * 2015-01-19 2016-07-20 Lehigh Technologies, Inc. Recycled micronized rubber formulation having improved abrasion resistance
WO2021141750A1 (en) * 2020-01-07 2021-07-15 Coe William B Method for preparing a recycled rubber-based elastomer

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