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WO2025182253A1 - Procédé de séparation de caoutchouc/câblé d'acier, procédé de recyclage de câblés d'acier et procédé de recyclage de caoutchouc pour pneu - Google Patents

Procédé de séparation de caoutchouc/câblé d'acier, procédé de recyclage de câblés d'acier et procédé de recyclage de caoutchouc pour pneu

Info

Publication number
WO2025182253A1
WO2025182253A1 PCT/JP2024/044494 JP2024044494W WO2025182253A1 WO 2025182253 A1 WO2025182253 A1 WO 2025182253A1 JP 2024044494 W JP2024044494 W JP 2024044494W WO 2025182253 A1 WO2025182253 A1 WO 2025182253A1
Authority
WO
WIPO (PCT)
Prior art keywords
rubber
steel
steel cord
tire
heat treatment
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/JP2024/044494
Other languages
English (en)
Japanese (ja)
Inventor
隆之 佐藤
将広 北條
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bridgestone Corp
Original Assignee
Bridgestone Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bridgestone Corp filed Critical Bridgestone Corp
Publication of WO2025182253A1 publication Critical patent/WO2025182253A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • B29B17/02—Separating plastics from other materials
    • 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
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C19/00—Tyre parts or constructions not otherwise provided for
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • 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 for separating rubber from steel cord, a method for recycling steel cord, and a method for recycling tire rubber.
  • steel recovered using this technology often contains impurities such as rubber, and the sulfur and metal components contained in rubber can degrade the quality of the steel. Therefore, even if it is recycled, its use as wire (steel cord) for tires (horizontal recycling) is limited, and it often ends up being downcycled.
  • Patent Document 1 therefore discloses a technology in which the tread portion is heated by induction heating, and the portion that has expanded due to the heat is cut open to remove and recover the steel wire.
  • the technology in Patent Document 1 makes it possible to remove the steel cord from the tire tread portion with a relatively simple procedure.
  • Patent Document 1 does not sufficiently separate the steel cord from the rubber, and there was a need for the development of a technology that would further promote separation of the steel cord from the rubber and enable the recovery of steel materials with higher purity.
  • an object of the present invention is to provide a rubber-steel cord separation method that can reduce the amount of rubber adhering to the steel cord without going through complicated steps and enables horizontal recycling of the recovered steel.
  • Another object of the present invention is to provide a steel cord recycling method that enables horizontal recycling of recovered steel, and a tire rubber recycling method that enables various types of recycling of recovered rubber.
  • a method for separating rubber and steel cords contained in a tire comprising the steps of: Prior to separation of the rubber and the steel cord, The rubber-steel cord separation method includes a wet heat treatment step of placing the tire in a wet heat environment at a temperature of 60°C or higher and a humidity of 60% or higher.
  • the rubber-steel cord separation method having the above configuration can reduce the amount of rubber adhering to the steel cord without going through complicated steps, and enables horizontal recycling of the recovered steel.
  • a method for recycling steel cords characterized in that the steel obtained by the rubber-steel cord separation method according to (1) is reused as a steel cord.
  • the steel cord recycling method having the above-described configuration enables horizontal recycling of the recovered steel.
  • a method for recycling rubber for tires characterized in that the rubber obtained by the rubber-steel cord separation method described in (1) is reused as rubber for tires.
  • the steel cord recycling method having the above-described configuration can be applied to various recycling processes of recovered rubber.
  • the present invention it is possible to provide a rubber-steel cord separation method that can reduce the amount of rubber adhering to steel cords without going through complicated steps and enables horizontal recycling of recovered steel. Furthermore, the present invention can provide a steel cord recycling method that allows horizontal recycling of recovered steel, and a tire rubber recycling method that allows various types of recycling of recovered rubber.
  • the rubber-steel cord separation method of the present invention is a method for separating the rubber and steel cord contained in a tire.
  • the present invention is characterized in that it includes a wet heat treatment step of placing the tire in a wet heat environment at a temperature of 60°C or higher and a humidity of 60% or higher prior to separating the rubber from the steel cord.
  • the inventors of the present invention have studied methods for separating rubber from steel cords, and have found that in order to maintain the quality of the recovered steel material and enable horizontal recycling, it is necessary to reduce the amount of rubber adhering to the steel cords. They have also noticed that it would be effective to include a process for reducing the adhesion between the rubber and steel cords during the general recycling process of waste tires.
  • the researchers discovered that by subjecting the tire to a moist heat treatment process in which the tire is placed in a moist heat environment of 60°C or higher and a humidity of 60% or higher prior to separating the rubber from the steel cord, the adhesion between the rubber and the steel cord is reduced, and the amount of rubber adhering when the rubber and steel cord are separated can be significantly reduced.
  • the rubber-steel cord separation method of the present invention does not require a complicated process, can reduce the amount of rubber adhering to the steel cord, and enables horizontal recycling of the recovered steel.
  • the tires used in the rubber-steel cord separation method of the present invention are usually used scrap tires. However, they do not necessarily have to be scrap tires, and when it is necessary to separate the rubber from the steel cords, new tires or tires currently in use can also be used. Furthermore, the type of tire and the configuration of the rubber and steel cords are not particularly limited, except that the tire contains rubber and steel cords, and can be selected appropriately.
  • the rubber-steel cord separation method of the present invention includes a wet heat treatment step of placing the tire in a wet heat environment at a temperature of 60°C or higher and a humidity of 60% or higher prior to separation of the rubber and the steel cord.
  • the wet heat treatment step can reduce the adhesion between the rubber and the steel cord, and therefore the amount of rubber adhering when the rubber and the steel cord are subsequently separated can be significantly reduced.
  • the temperature in the moist heat treatment step is preferably 60° C. or higher, and more preferably 70° C. or higher.
  • the temperature in the moist heat treatment step is preferably 180° C. or lower.
  • the humidity in the wet heat treatment step is preferably 60% or more, and more preferably 70% or more.
  • the wet heat treatment step is preferably carried out for 12 hours or more, although this depends on the exposure state of the steel cord, etc. This more reliably reduces the adhesion between the rubber and the steel cord, and further reduces the amount of rubber adhering when the rubber and the steel cord are separated. From the same viewpoint, the moist heat treatment step is preferably carried out for 12 hours or more, and more preferably for 36 hours or more.
  • the oxygen concentration in the moist heat environment is preferably 20% or higher, and more preferably 40% or higher. This is because it promotes oxidation at the interface between the rubber and the steel cord, and more efficiently reduces adhesion.
  • the atmospheric pressure in the moist heat environment can be high.
  • the atmospheric pressure is preferably 100 kPa or higher, and more preferably 150 kPa or higher. This is because it promotes deterioration of the interface between the rubber and the steel cord, and more efficiently reduces adhesion.
  • the rubber-steel cord separation method of the present invention further includes, prior to the wet heat treatment step, a disassembly step of cutting the tire at least one location to expose a cross section of the tire including the steel cord.
  • a disassembly step of cutting the tire at least one location to expose a cross section of the tire including the steel cord.
  • the conditions for cutting the tire in the disassembly process are not particularly limited, as long as the tire is cut in at least one location and the tire cross section including the steel cord is exposed. For example, from the perspective of exposing more of the steel cord, it is preferable to increase the number of cut locations in the tire, and from the perspective of reducing the effort and time required for the process, it is preferable to reduce the number of cut locations.
  • the amount of exposed steel cord in the tire cross section and the duration of the moist heat treatment process are inversely proportional to each other, so by increasing the amount of exposed steel cord, the duration of the moist heat treatment process can be reduced.
  • the adhesion between the rubber and the steel cord can be reduced more efficiently without carrying out the moist heat treatment process for a long period of time.
  • the device used to cut the tire in the disassembly process is not particularly limited, and any commercially available tire cutting machine can be selected as appropriate.
  • the rubber-steel cord separation method of the present invention preferably further includes a dielectric heating step of heating the steel cord portion in the tire to 100 to 180° C. by dielectric heating prior to the wet heat treatment step.
  • a dielectric heating step of heating the steel cord portion in the tire to 100 to 180° C. by dielectric heating prior to the wet heat treatment step.
  • the steel cord portion is heated to 100°C or higher in order to more effectively reduce the adhesion between the rubber and the steel cord, and the steel cord portion is heated to 180°C or lower in order to prevent deterioration of the steel cord and the rubber due to excessive heating. From the same perspective, it is more preferable to heat the steel cord portion by dielectric heating to 120 to 160°C.
  • the heating device used for the induction heating is not particularly limited, and commercially available products can be used as appropriate.
  • a device having a movable high-frequency induction coil is preferably used as the induction heating means.
  • the invention is not limited to this, and any suitable type of induction heating means, including a device having a fixed high-frequency induction coil, can also be used.
  • the induction heating means may be, for example, a high-frequency hardening device having a frequency of 50 kHz and an output of several tens of kilowatts.
  • the shape of the heating coil is also not limited.
  • the method of heating the tread portion with the high-frequency induction coil may be any appropriate method, such as fixing the high-frequency induction coil and bringing the rotating tread portion close to it, or bringing the high-frequency induction coil close to the tread portion fixed to a fixing means, but the method is not particularly limited.
  • the dielectric heating process is carried out prior to the moist heat treatment process, but may be carried out either before or after the decomposition process. From the perspective of more effectively promoting a decrease in adhesion between the rubber and the steel cord, it is preferable to carry out the dielectric heating process after the decomposition process, that is, between the decomposition process and the moist heat treatment process.
  • the heating time in the dielectric heating step is not particularly limited and can be adjusted as appropriate depending on the heating conditions of the steel cord.
  • the heating time can be set to between 1 second and 1000 minutes. If the heating time for the dielectric heating is 10 seconds or longer, it is possible to more reliably reduce the adhesion between the rubber and the steel cord, and if the heating time for the dielectric heating is 100 minutes or shorter, it is possible to more reliably prevent deterioration of the steel cord and rubber due to heating.
  • the rubber-steel cord separation method of the present invention preferably further includes an inner liner removal step of removing an inner liner from the tire prior to the moist heat treatment step.
  • the inner liner makes it difficult for air to pass through, so if it remains in the tire, it tends to inhibit deterioration of the adhesive strength between the rubber and the steel cord when the moist heat treatment step is carried out. Therefore, by removing the inner liner from the tire prior to the moist heat treatment step, the adhesion between the rubber and the steel cord can be more efficiently reduced, and the amount of rubber adhering when the rubber and the steel cord are separated can be significantly reduced.
  • the inner liner removal process is carried out prior to the wet heat treatment process, but preferably before the decomposition process and the dielectric heating process.
  • the rubber-steel cord separation method of the present invention preferably further includes a magnetic separation step of finely shredding the tire after the wet heat treatment step and extracting steel by magnetic separation. By selecting and extracting steel by magnetic separation, it is possible to efficiently recover steel.
  • the tire after the wet heat treatment step is cut into small pieces, and the cut size can be appropriately selected depending on the time for the wet heat treatment step, the performance of the magnetic separator, etc.
  • the cut size can be appropriately selected depending on the time for the wet heat treatment step, the performance of the magnetic separator, etc.
  • the steel extracted after the magnetic separation process has a small amount of rubber attached; specifically, the amount of rubber attached is 10% by mass or less when the mass of the steel is 100% by mass. When the amount of rubber attached is as low as 10% by mass or less, horizontal recycling of the recovered steel is possible.
  • the method for recycling steel cords of the present invention is characterized in that the steel obtained by the above-mentioned method for separating rubber and steel cords of the present invention is reused as steel cords.
  • the steel obtained by the rubber-steel cord separation method of the present invention is of a quality that allows horizontal recycling, and therefore the quality of the original steel cord can be maintained even for the steel cord obtained by recycling.
  • the steel cord recycling method of the present invention is characterized in that the rubber obtained by the rubber-steel cord separation method of the present invention is reused as tire rubber.
  • the rubber recovered by the rubber-steel cord separation method of the present invention is recyclable and can therefore be used as tire rubber.
  • Examples 1 to 3 Comparative Example 1, Conventional Example
  • the steel cords are separated and recovered under the conditions shown in Table 1.
  • the steps are carried out in the following order: inner liner removal step, decomposition step, dielectric heating step, moist heat treatment step, and magnetic separation step.
  • the tire is cut using a cutting machine.
  • the induction heating step in Table 1 is carried out at a steel heating temperature of 120°C for 1 minute.
  • the moist heat treatment step in Table 1 is carried out for 24 hours under conditions of a temperature of 70 to 90°C and a humidity of 50 to 90%.
  • the magnetic separation step in Table 1 the tires after the wet heat treatment are crushed into 1-inch square pieces.
  • Example 1 From the results in Table 1, it can be seen that in Examples 1 to 3, the amount of remaining rubber was smaller than in the comparative example and conventional example, and higher quality steel was eliminated. Furthermore, it can be seen that in Example 3, in which the dielectric heating step was carried out, the amount of remaining rubber was particularly small.
  • the present invention it is possible to provide a rubber-steel cord separation method that can reduce the amount of rubber adhering to steel cords without going through complicated steps and enables horizontal recycling of recovered steel. Furthermore, the present invention can provide a steel cord recycling method that allows horizontal recycling of recovered steel, and a tire rubber recycling method that allows various types of recycling of recovered rubber.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)

Abstract

La présente invention concerne un procédé de séparation de caoutchouc/câblé d'acier, le procédé permettant de réduire la quantité de caoutchouc adhérent sur des câblés d'acier, sans aucune étape compliquée, et permettant un recyclage en boucle fermée de l'acier récupéré.　Est divulgué un procédé de séparation du caoutchouc contenu dans un pneu à partir des câblés d'acier contenus dans celui-ci, le procédé se caractérisant en ce qu'il comprend une étape de traitement thermique par voie humide dans laquelle, avant la séparation entre le caoutchouc et les câblés d'acier, le pneu est placé dans un environnement thermique humide ayant une température de 60 °C ou supérieure et une humidité de 60 % ou supérieure.
PCT/JP2024/044494 2024-02-26 2024-12-16 Procédé de séparation de caoutchouc/câblé d'acier, procédé de recyclage de câblés d'acier et procédé de recyclage de caoutchouc pour pneu Pending WO2025182253A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2024026952 2024-02-26
JP2024-026952 2024-02-26

Publications (1)

Publication Number Publication Date
WO2025182253A1 true WO2025182253A1 (fr) 2025-09-04

Family

ID=96921086

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2024/044494 Pending WO2025182253A1 (fr) 2024-02-26 2024-12-16 Procédé de séparation de caoutchouc/câblé d'acier, procédé de recyclage de câblés d'acier et procédé de recyclage de caoutchouc pour pneu

Country Status (1)

Country Link
WO (1) WO2025182253A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06121977A (ja) * 1992-05-21 1994-05-06 Saburo Maruseko タイヤの加硫ゴム・鋼線類分別回収方法
JP2000317335A (ja) * 1999-03-08 2000-11-21 Mori Seisakusho:Kk 廃タイヤの粉砕方法及びその装置
JP2003039434A (ja) * 2001-08-01 2003-02-13 Yokohama Rubber Co Ltd:The タイヤ解体法
JP2003534596A (ja) * 2000-05-25 2003-11-18 レイディオスケープ リミテッド プログラマブルシングルチップデバイス及び関連する開発環境
JP2004087469A (ja) * 2002-07-04 2004-03-18 Tokyo Electric Power Co Inc:The ケーブルの解体方法
JP2023083761A (ja) * 2021-12-06 2023-06-16 横浜ゴム株式会社 金属接着用ゴム組成物、及び、タイヤ

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06121977A (ja) * 1992-05-21 1994-05-06 Saburo Maruseko タイヤの加硫ゴム・鋼線類分別回収方法
JP2000317335A (ja) * 1999-03-08 2000-11-21 Mori Seisakusho:Kk 廃タイヤの粉砕方法及びその装置
JP2003534596A (ja) * 2000-05-25 2003-11-18 レイディオスケープ リミテッド プログラマブルシングルチップデバイス及び関連する開発環境
JP2003039434A (ja) * 2001-08-01 2003-02-13 Yokohama Rubber Co Ltd:The タイヤ解体法
JP2004087469A (ja) * 2002-07-04 2004-03-18 Tokyo Electric Power Co Inc:The ケーブルの解体方法
JP2023083761A (ja) * 2021-12-06 2023-06-16 横浜ゴム株式会社 金属接着用ゴム組成物、及び、タイヤ

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