WO2024204390A1 - タイヤ用ゴム組成物、タイヤ用ゴム組成物の製造方法、タイヤ用ゴム材料、タイヤ用ゴム材料の製造方法および再生ゴム - Google Patents

タイヤ用ゴム組成物、タイヤ用ゴム組成物の製造方法、タイヤ用ゴム材料、タイヤ用ゴム材料の製造方法および再生ゴム Download PDF

Info

Publication number
WO2024204390A1
WO2024204390A1 PCT/JP2024/012319 JP2024012319W WO2024204390A1 WO 2024204390 A1 WO2024204390 A1 WO 2024204390A1 JP 2024012319 W JP2024012319 W JP 2024012319W WO 2024204390 A1 WO2024204390 A1 WO 2024204390A1
Authority
WO
WIPO (PCT)
Prior art keywords
rubber
mass
parts
tires
fumed silica
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.)
Ceased
Application number
PCT/JP2024/012319
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
友樹 松本
学 近藤
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.)
Tokuyama Corp
Original Assignee
Tokuyama 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 Tokuyama Corp filed Critical Tokuyama Corp
Priority to KR1020257029182A priority Critical patent/KR20250164167A/ko
Priority to JP2025511047A priority patent/JPWO2024204390A1/ja
Priority to CN202480015733.4A priority patent/CN120787244A/zh
Priority to EP24780492.5A priority patent/EP4660234A1/en
Publication of WO2024204390A1 publication Critical patent/WO2024204390A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L7/00—Compositions of natural rubber
    • 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
    • B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/34—Silicon-containing compounds
    • C08K3/36—Silica
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/54—Silicon-containing compounds
    • C08K5/548—Silicon-containing compounds containing sulfur
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L17/00—Compositions of reclaimed rubber
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2207/00—Properties characterising the ingredient of the composition
    • C08L2207/20—Recycled plastic
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2207/00—Properties characterising the ingredient of the composition
    • C08L2207/20—Recycled plastic
    • C08L2207/24—Recycled plastic recycling of old tyres and caoutchouc and addition of caoutchouc particles
    • 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 rubber composition for tires, a rubber material for tires, and their manufacturing methods, as well as reclaimed rubber.
  • Automobile tires are required to have various characteristics such as wear resistance, low fuel consumption, and wet grip.
  • wear resistance For example, based on environmental regulations such as the labeling systems in Japan and Europe and the Smart Way regulations in North America, there is a demand for low rolling resistance in particular to achieve low fuel consumption.
  • JIS K 6313 stipulates that recycled rubber is made from used rubber from automobile tires, tubes, and other rubber products, and that it has certain performance properties.
  • rubber compositions for tires that contain recycled rubber have reduced properties required for tires, so there has been no incentive to actively incorporate recycled rubber into rubber compositions for tires, and recycled rubber has been viewed as simply an additive that increases the volume of rubber compositions for tires.
  • Patent Document 1 discloses a rubber composition for tires that combines natural rubber with recycled rubber that contains carbon black, a carbon coupling agent, and wet silica, and discloses that this rubber composition improves tensile break properties and low heat generation.
  • Patent Document 2 also discloses a rubber composition in which the amount of hydrogen in the carbon black used as a reinforcing filler is reduced. It discloses that this rubber composition can improve fatigue crack resistance.
  • the rubber composition for tires described in Patent Document 1 has not been evaluated for abrasion resistance and fatigue crack resistance, and there is a problem that it is not a rubber composition for tires suitable for heavy load tires.
  • the rubber composition for tires described in Patent Document 2 has a problem that its abrasion resistance and fatigue crack resistance are insufficient.
  • the present invention was made in consideration of these circumstances, and aims to provide a rubber material for tires that has a good balance of abrasion resistance, breaking strength, fatigue crack resistance, and fuel efficiency even when recycled rubber is blended, a rubber composition for tires that is suitable for the rubber material for tires, methods for producing them, and recycled rubber that is suitable for the rubber composition for tires.
  • a rubber composition for tires comprising 100 parts by mass of diene rubber and 5 parts by mass or more and 100 parts by mass or less of reclaimed rubber containing fumed silica.
  • the rubber composition for tires according to [1] further comprising 5 parts by mass or more and 90 parts by mass or less of fumed silica.
  • the rubber composition for tires according to [2] further comprising 0.1 parts by mass or more and 30 parts by mass or less of a silane coupling agent.
  • [5] A rubber material for tires obtained by vulcanizing the rubber composition for tires according to any one of [1] to [4].
  • [6] The rubber material for tires according to [5], having a tear strength TS of 40 kN/m or more.
  • a process for producing a rubber composition for tires comprising a step of kneading a diene rubber and a reclaimed rubber containing fumed silica
  • the method for producing a rubber composition for tires comprises blending 5 parts by mass or more and 100 parts by mass or less of reclaimed rubber containing fumed silica with 100 parts by mass of diene rubber.
  • a master batch obtained by kneading a diene rubber and fumed silica is further blended and kneaded
  • a method for producing a rubber material for tires comprising a step of vulcanizing a rubber composition for tires obtained by the method for producing a rubber composition for tires according to any one of [7] to [11].
  • the present invention provides a rubber material for tires that has good abrasion resistance even when blended with recycled rubber, a rubber composition for tires suitable for the rubber material for tires, methods for producing them, and recycled rubber suitable for the rubber composition for tires.
  • FIG. 1 is a process diagram of a method for producing a rubber composition for tires and a rubber material for tires using a master batch and recycled rubber.
  • Rubber composition for tires 1.1. Diene rubber 1.2. Reclaimed rubber 1.3. Fumed silica 1.4. Silane coupling agent 1.5. Other components 2. Manufacturing method of rubber composition for tires 3. Rubber material for tires
  • the rubber composition for tires according to the present embodiment is a kneaded product used to obtain a rubber material for tires, and contains at least a diene rubber and reclaimed rubber.
  • diene rubbers contained in the rubber composition for tires according to this embodiment include natural rubber, isoprene rubber, butadiene rubber, styrene butadiene rubber, acrylonitrile butadiene rubber, butyl rubber, ethylene-propylene-diene rubber, chloroprene rubber, etc.
  • natural rubber and isoprene rubber is preferred, natural rubber or natural rubber and isoprene rubber is more preferred, and natural rubber is even more preferred.
  • Natural rubber includes natural rubber (NR) and modified natural rubber such as epoxidized natural rubber (ENR), hydrogenated natural rubber (HNR), deproteinized natural rubber (DPNR), and high-purity natural rubber (HPNR). These natural rubbers may be used alone or in combination of two or more types.
  • NR natural rubber
  • EMR epoxidized natural rubber
  • HNR hydrogenated natural rubber
  • DPNR deproteinized natural rubber
  • HPNR high-purity natural rubber
  • the reclaimed rubber is rubber that has been regenerated by processing a rubber material.
  • the rubber material before processing is preferably rubber after vulcanization, and the vulcanized rubber may be used rubber such as waste, or may be rubber before use. Examples of the processing performed on the rubber material include crushing and devulcanization.
  • the reclaimed rubber is preferably rubber that has been devulcanized after vulcanization.
  • the used rubber is not particularly limited as long as it is a normal rubber material, and examples include automobile tires, tubes, etc.
  • the reclaimed rubber contains fumed silica.
  • the rubber material before being reclaimed contains fumed silica.
  • Fumed silica is fine particle silicon dioxide produced by high-temperature hydrolysis of silicon tetrachloride in an oxyhydrogen flame. Therefore, fumed silica is also called dry silica because its production method differs from that of wet silica, which is produced by wet methods such as precipitation and gelation. Fumed silica has a smaller primary particle size of the primary aggregate (smallest constituent) and a larger nitrogen adsorption BET specific surface area than wet silica. The particles of fumed silica are aggregated and fused in a beaded shape, forming bulky aggregates.
  • the properties (wear resistance, breaking strength, fatigue crack resistance, fuel economy, etc.) of the tire rubber material obtained by compounding the recycled rubber are comparable to those of a tire rubber material of the same composition that does not contain recycled rubber, and are better than those of a tire rubber material that contains carbon black. Therefore, tire rubber materials obtained by compounding recycled rubber that contains fumed silica are suitable for heavy-duty tires. In other words, the recycled rubber can be used as an additive to improve the properties of tire rubber materials.
  • the BET specific surface area of the fumed silica contained in the reclaimed rubber is preferably 50 m2 /g or more, 80 m2 /g or more, 120 m2 /g or more, 200 m2 /g or more, 250 m2 /g or more, 300 m2 /g or more, or 350 m2 /g or more.
  • the upper limit of the BET specific surface area of the fumed silica contained in the reclaimed rubber is not particularly limited, but is, for example, 500 m2 /g. If the BET specific surface area of the fumed silica is too small, the flame temperature during the production of the fumed silica must be increased, and the structure specific to the fumed silica is lost, which tends to make it difficult to produce the fumed silica stably. If the BET specific surface area of the fumed silica is too large, it tends to make it difficult to produce the fumed silica stably.
  • hydrophobic fumed silica and hydrophilic fumed silica are distinguished by the degree of modified hydrophobicity (M value) shown below.
  • the degree of modified hydrophobicity (M value) is a value obtained by a measurement method utilizing the fact that hydrophobic fumed silica floats in water but is completely suspended in methanol. The method described in the examples of WO 2004/099075 can be used to measure the M value.
  • hydrophobic fumed silica and hydrophilic fumed silica are expressed using the M value, hydrophobic fumed silica has an M value of 1 or more, and hydrophilic fumed silica has an M value of less than 1.
  • the fumed silica contained in the reclaimed rubber is preferably hydrophilic fumed silica.
  • the reclaimed rubber contains hydrophilic fumed silica, the properties of the tire rubber material obtained by compounding the reclaimed rubber tend to be further improved.
  • wet silica reduces the abrasion resistance of rubber materials for tires compared to carbon black, and so wet silica is not compounded into heavy-duty tires.
  • reclaimed rubber made from used heavy-duty tires does not contain wet silica.
  • fumed silica is difficult to mix with rubber components due to its bulkiness, so tires containing fumed silica are not commercially available.
  • reclaimed rubber made from used tires does not contain fumed silica.
  • the rubber composition for tires according to this embodiment is prepared by blending 5 parts by mass or more and 100 parts by mass or less of recycled rubber with respect to 100 parts by mass of diene rubber.
  • the blending amount of recycled rubber with respect to 100 parts by mass of diene rubber is preferably 7 parts by mass or more, and more preferably 9 parts by mass or more.
  • the blending amount of recycled rubber with respect to 100 parts by mass of diene rubber is preferably 70 parts by mass or less, more preferably 50 parts by mass or less, even more preferably 40 parts by mass or less, and particularly preferably 35 parts by mass or less.
  • Reclaimed rubber contains a rubber component and fumed silica, and in the manufacturing method of a rubber composition for tires described below, before the diene rubber and reclaimed rubber are kneaded, the rubber component in the reclaimed rubber is distinguished from the diene rubber. After the diene rubber and reclaimed rubber are kneaded, the rubber component is integrated with the diene rubber in the kneaded product.
  • the composition of the rubber component in the reclaimed rubber may be the same as or different from the diene rubber described above.
  • the amount of fumed silica is preferably 5 parts by mass or more and 90 parts by mass or less, more preferably 10 parts by mass or more and 70 parts by mass or less, and even more preferably 15 parts by mass or more and 55 parts by mass or less, per 100 parts by mass of the rubber component.
  • reclaimed rubber may contain components other than rubber components and fumed silica.
  • components include coupling agents such as silane coupling agents, lubricants (stearic acid, oil, etc.), and fillers (carbon black, wet silica, etc.).
  • the rubber composition for tires may contain components other than the above-mentioned components (diene rubber and reclaimed rubber).
  • the rubber composition for tires is preferably compounded with fumed silica in addition to the above-mentioned components. It is considered that compounding fumed silica in addition to the above-mentioned components makes it easier to form a structure due to fumed silica in the rubber composition for tires. As a result, it is considered that the presence of such a structure in the rubber material for tires obtained by vulcanizing the rubber composition for tires improves the abrasion resistance of the rubber material for tires.
  • the fumed silica is distinguished from the fumed silica in the recycled rubber. After the fumed silica and recycled rubber are kneaded together, the fumed silica is integrated with the fumed silica in the recycled rubber in the kneaded mixture.
  • the type and physical properties of the fumed silica to be blended may be the same as or different from the type and physical properties of the fumed silica contained in the reclaimed rubber.
  • the above description of the fumed silica contained in the reclaimed rubber can be applied to the blended fumed silica. Therefore, the blended fumed silica is preferably hydrophilic fumed silica.
  • the BET specific surface area of the blended fumed silica is preferably 50 m 2 /g or more, 80 m 2 /g or more, 120 m 2 /g or more, 200 m 2 /g or more, 250 m 2 /g or more, 300 m 2 /g or more, or 350 m 2 /g or more, similar to the fumed silica contained in the reclaimed rubber.
  • the upper limit of the BET specific surface area of the blended fumed silica is not particularly limited, but is, for example, 500 m 2 / g.
  • the amount of fumed silica is preferably 5 parts by mass or more and 90 parts by mass or less per 100 parts by mass of diene rubber. By having the amount of fumed silica within the above range, the abrasion resistance and fatigue crack resistance of the rubber material for tires can be improved.
  • the amount of fumed silica is preferably 8 parts by mass or more, more preferably 10 parts by mass or more, and even more preferably 15 parts by mass or more, per 100 parts by mass of diene rubber.
  • the amount of fumed silica is preferably 80 parts by mass or less, more preferably 70 parts by mass or less, and even more preferably 55 parts by mass or less, per 100 parts by mass of diene rubber.
  • the content of fumed silica i.e., the total of the blended fumed silica and the fumed silica in the reclaimed rubber, is preferably 5 parts by mass or more and 90 parts by mass or less, more preferably 10 parts by mass or more and 70 parts by mass or less, and even more preferably 15 parts by mass or more and 55 parts by mass or less, per 100 parts by mass of the total of the diene rubber and the rubber components in the reclaimed rubber. If the content of fumed silica is too low, the abrasion resistance and fatigue crack resistance of the resulting rubber material for tires tend not to be sufficient. If the content of fumed silica is too high, the fumed silica does not disperse sufficiently in the diene rubber, and a good kneaded product tends not to be obtained.
  • the rubber composition for tires is preferably blended with a silane coupling agent in addition to the above-mentioned components.
  • a silane coupling agent By blending the silane coupling agent, a crosslinked structure between the diene rubber and the fumed silica is easily formed via the silane coupling agent. As a result, the dispersibility of the fumed silica in the rubber composition for tires is improved, and the abrasion resistance and fatigue crack resistance of the rubber material for tires can be improved.
  • the silane coupling agent is distinguished from the silane coupling agent in the recycled rubber before the silane coupling agent and the recycled rubber are kneaded. After the silane coupling agent and the recycled rubber are kneaded, the silane coupling agent is integrated with the silane coupling agent in the recycled rubber in the kneaded mixture.
  • the type and physical properties of the silane coupling agent to be blended may be the same as or different from the type and physical properties of the silane coupling agent contained in the reclaimed rubber. There are no particular limitations on the silane coupling agent to be blended, so long as it is one that is normally used in rubber compositions. In this embodiment, a sulfur-containing silane coupling agent is preferred.
  • sulfur-containing silane coupling agents include bis-(3-triethoxysilylpropyl) tetrasulfide, bis(3-triethoxysilylpropyl) disulfide, 3-trimethoxysilylpropyl benzothiazole tetrasulfide, ⁇ -mercaptopropyl triethoxysilane, 3-octanoylthiopropyl triethoxysilane, and mercapto-thiocarboxylate oligomers.
  • the silane coupling agent to be blended is preferably a blocked mercaptosilane, and is particularly preferably a mercapto-thiocarboxylate oligomer.
  • the mercapto-thiocarboxylate oligomer is an oligomer of thiocarboxylate having a mercapto group.
  • An example of the molecular structure of the mercapto-thiocarboxylate oligomer is shown below. In the molecular structure below, the sum (x+y) of the repeat number (x) of the bond unit A and the repeat number (y) of the bond unit B is preferably in the range of 3 to 300. Within this range, the mercaptosilane of the bond unit B is covered by the -C 7 H 15 of the bond unit A, so that the scorch time can be suppressed from being shortened and good reactivity with the fumed silica and diene rubber can be ensured.
  • a specific example of the mercapto-thiocarboxylate oligomer is "NXT-Z45" manufactured by Momentive.
  • the amount of the silane coupling agent is preferably 0.1 parts by mass or more and 30 parts by mass or less per 100 parts by mass of the diene rubber.
  • the content of the silane coupling agent i.e., the total of the silane coupling agent blended and the silane coupling agent in the reclaimed rubber, is preferably 0.1 parts by mass or more and 30 parts by mass or less, more preferably 2.0 parts by mass or more and 25 parts by mass or less, and even more preferably 2.5 parts by mass or more and 20 parts by mass or less, per 100 parts by mass of the total of the diene rubber and the rubber components in the reclaimed rubber. If the content of the silane coupling agent is too low, the dispersibility of the fumed silica in the rubber composition for tires tends to be insufficient. If the content of the silane coupling agent is too high, the silane coupling agents tend to condense with each other, and the abrasion resistance and fatigue crack resistance of the resulting rubber material for tires may not be sufficiently improved.
  • the rubber composition for tires may contain components to be blended in rubber compositions other than the above-mentioned components (diene rubber, reclaimed rubber, fumed silica, and silane coupling agent).
  • a component is a lubricant. Blending the lubricant improves the kneadability of each component, and makes it easier to obtain a rubber composition for tires in which each component is well dispersed.
  • lubricants examples include stearic acid and process oil.
  • process oil examples include aromatic oil, paraffin oil, naphthenic oil, etc.
  • a single lubricant may be used, or two or more types may be used in combination.
  • the amount of lubricant blended is not limited as long as the effects of the present invention can be obtained.
  • the amount of lubricant blended is preferably 1 part by mass or more and 40 parts by mass or less, more preferably 2 parts by mass or more and 35 parts by mass or less, and even more preferably 3 parts by mass or more and 30 parts by mass or less, per 100 parts by mass of diene rubber.
  • the amount of lubricant blended is too small, the viscosity will be high and kneading will be poor, and the abrasion resistance and fatigue crack resistance of the resulting tire rubber material may not be improved sufficiently. If the amount of lubricant blended is too large, shear will not be applied during kneading, and the fumed silica may not be able to disperse sufficiently in the diene rubber.
  • the rubber composition for tires may contain a reinforcing filler other than fumed silica.
  • reinforcing fillers include carbon black, wet silica, clay, mica, talc, calcium carbonate, aluminum hydroxide, aluminum oxide, titanium oxide, etc.
  • an appropriate amount of a filler coupling agent can also be blended.
  • the amount of reinforcing filler blended is not limited as long as the effects of the present invention can be obtained, and may be a general blending amount.
  • the rubber composition for tires may contain various additives such as zinc oxide, antioxidants, plasticizers, processing aids, liquid polymers, and thermosetting resins.
  • additives such as zinc oxide, antioxidants, plasticizers, processing aids, liquid polymers, and thermosetting resins.
  • the amount of these additives to be added is not limited as long as the effects of the present invention can be obtained, and may be any amount that is generally used.
  • the rubber composition for tires according to this embodiment is obtained by kneading the diene rubber described above, the reclaimed rubber described above, and, if necessary, other components (fumed silica, silane coupling agent, lubricant, reinforcing filler, various additives).
  • other components fumed silica, silane coupling agent, lubricant, reinforcing filler, various additives.
  • the rubber composition for tires may be produced by kneading the specified components to prepare a master batch, and then blending and kneading the remaining components into the master batch, or by kneading all of the components together.
  • the above-mentioned diene rubber is kneaded with other components (fumed silica, silane coupling agent, lubricant, reinforcing filler, various additives, reclaimed rubber, etc.).
  • other components fumed silica, silane coupling agent, lubricant, reinforcing filler, various additives, reclaimed rubber, etc.
  • it is preferable to prepare the master batch by kneading at least the diene rubber and fumed silica it is more preferable to prepare the master batch by kneading at least the diene rubber, fumed silica, and silane coupling agent.
  • the master batch may contain 13 parts by mass or more and 130 parts by mass or less, 15 parts by mass or more and 110 parts by mass or less, or 20 parts by mass or more and 100 parts by mass or less of fumed silica per 100 parts by mass of diene rubber.
  • the master batch may contain, in addition to the fumed silica, 1 part by mass or more and 40 parts by mass or less of a silane coupling agent, 1.5 parts by mass or more and 30 parts by mass or less, or 2 parts by mass or more and 20 parts by mass or less, per 100 parts by mass of diene rubber.
  • the master batch is preferably a mixture to be kneaded with compounding components that include at least a rubber component.
  • the master batch is preferably kneaded with other compounding components that include at least a rubber component to become part of the rubber composition for tires.
  • the master batch contains fumed silica
  • the content ratio of fumed silica relative to the rubber components in the master batch is higher than the content ratio of fumed silica relative to all rubber components in a rubber composition for tires that contains the master batch.
  • the concentration of fumed silica relative to the amount of rubber components in the master batch is higher than the concentration of fumed silica relative to the amount of rubber components in the rubber composition for tires.
  • the master batch is a kneaded product that contains a high concentration of fumed silica.
  • a kneading device for producing the master batch for example, a Banbury mixer, kneader, or other known kneading device can be used.
  • the master batch After the master batch is prepared, other components are blended and kneaded with the master batch to obtain a rubber composition for tires.
  • other components are blended and kneaded with the master batch to obtain a rubber composition for tires.
  • a Banbury mixer, kneader, or other known kneading device can be used to knead the master batch with the other components.
  • all the components When all the components are mixed to produce a rubber composition for tires, all the components may be mixed in a known mixing device such as a Banbury mixer or kneader, either simultaneously or sequentially.
  • the mixing conditions should be set so that each component is thoroughly mixed.
  • the rubber material for tires according to this embodiment is a material obtained by vulcanizing the above-mentioned rubber composition for tires. Therefore, the rubber material for tires contains the above-mentioned component derived from recycled rubber. As a result, the rubber material for tires can exhibit excellent abrasion resistance, breaking strength, fatigue crack resistance, and fuel economy. That is, the rubber material for tires according to this embodiment has properties comparable to those of a rubber material for tires of the same composition that does not contain recycled rubber, despite containing a component derived from recycled rubber. Furthermore, compared with a rubber material for tires that does not contain recycled rubber and contains carbon black, the rubber material for tires according to this embodiment has an excellent balance of abrasion resistance, breaking strength, fatigue crack resistance, and fuel economy.
  • the tear strength TS of the tire rubber material according to this embodiment is preferably 40 kN/m or more, more preferably 42 kN/m or more, and even more preferably 44 kN/m or more.
  • tear strength is, for example, 200 kN/m.
  • Tear strength TS can be measured in accordance with JIS K6252-1.
  • the curve showing the change in tear force obtained by the measurement is analyzed based on JIS K6274, and the tear strength TS can be calculated from the analysis results.
  • the detailed measurement method will be explained in the examples.
  • the reclaimed rubber containing the above-mentioned fumed silica functions effectively as an additive to improve the properties of rubber materials.
  • the rubber material for tires according to this embodiment has excellent abrasion resistance, breaking strength, fatigue crack resistance, and fuel efficiency, and is therefore suitable for use in tires for trucks and buses. It can also be used for various tire components, particularly the tread, base tread, sidewall, clinch, etc.
  • Example 1 Preparation of Masterbatch
  • the following components were charged into a pressure kneader having a volume of 0.5 L so that the compounding amounts per 100 parts by mass of diene rubber were as shown in Table 1.
  • the components were kneaded for about 30 minutes at a rotor rotation speed of 20 to 40 rpm so that the temperature of the kneaded mixture was in the range of 130 to 160°C.
  • the air cylinder pressure was 0.7 MPa.
  • the mixture was cooled to room temperature and taken out to obtain a master batch (production example).
  • the mixture was then charged into a 0.6 L Labo Plastomill (Model BB600, manufactured by Toyo Seiki Seisakusho) so that the compounding amount per 100 parts by mass of diene rubber was the compounding amount shown in Table 1.
  • the mixture was kneaded for about 5 to 10 minutes at a rotor rotation speed of 20 to 40 rpm so that the temperature of the kneaded mixture was in the range of 120 to 140° C.
  • the mixture was cooled to room temperature and taken out to obtain a master batch (standard production example).
  • the reclaimed rubber used was the fumed silica-containing reclaimed rubber shown below.
  • the rubber composition for tires shown in Reference Example 1 in Table 2 was press-vulcanized at 150°C for 10 minutes to obtain a rubber material, which was then thermally aged in a dryer at 80°C for 120 hours. The rubber material after thermal aging was then subjected to a devulcanization treatment to obtain reclaimed rubber.
  • the reclaimed rubber obtained satisfied the requirements of JIS K 6313.
  • the hardness (Shore A hardness) of the obtained test piece of the tire rubber material was measured by a durometer in accordance with JIS K6253 Type A. The results are shown in Table 2.
  • tire rubber materials containing recycled rubber with fumed silica exhibit properties comparable to tire rubber materials of the same composition that do not contain recycled rubber. It was also confirmed that tire rubber materials containing recycled rubber with fumed silica have better properties than tire rubber materials containing carbon black.
  • Example 2 A rubber material for tires was obtained by the same method as in Experiment 1 using the master batches (production examples and standard production examples) prepared in Experiment 1 and each of the components (A) to (E) so as to obtain the formulation shown in Table 3.
  • reclaimed rubber (D-2) reclaimed rubber obtained by subjecting a rubber material obtained by vulcanizing the rubber composition shown in Comparative Example 11 (Standard Example 11) in Table 3 to a devulcanization treatment was used instead of the carbon black-containing tire reclaimed rubber.
  • the reclaimed rubber satisfied the provisions of JIS K 6313.
  • the treatment conditions for vulcanization, heat aging, and devulcanization were the same as those for the fumed silica-containing reclaimed rubber in Experiment 1.
  • the composition of Reference Example 11 is the same as that of Reference Example 1
  • the compositions of Examples 11 to 13 are the same as that of Examples 1 to 3
  • the compositions of Comparative Examples 11 to 14 are the same as that of Comparative Examples 1 to 4.
  • Test pieces were made from the resulting tire rubber material, and fatigue crack resistance was evaluated as follows.
  • the obtained rubber material test piece was punched out into a rectangular shape with a long side of 130 mm and a short side of 40 mm, and a 70 mm long incision was made from the midpoint of the short side in the long side direction to obtain a trouser-shaped test piece.
  • the thickness of the test piece was 1 mm.
  • a tensile test was performed on the trouser-shaped test piece at a tensile speed of 100 mm/min in accordance with JIS K6252-1, and the tear strength until the test piece broke was measured.
  • the measured tear strength was analyzed based on JIS K6274, and the tear strength was calculated. The results are shown in Table 3.
  • tire rubber materials containing recycled rubber with fumed silica exhibit properties comparable to tire rubber materials of the same composition that do not contain recycled rubber. It was also confirmed that tire rubber materials containing recycled rubber with fumed silica have better properties than tire rubber materials containing carbon black.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Tires In General (AREA)
PCT/JP2024/012319 2023-03-30 2024-03-27 タイヤ用ゴム組成物、タイヤ用ゴム組成物の製造方法、タイヤ用ゴム材料、タイヤ用ゴム材料の製造方法および再生ゴム Ceased WO2024204390A1 (ja)

Priority Applications (4)

Application Number Priority Date Filing Date Title
KR1020257029182A KR20250164167A (ko) 2023-03-30 2024-03-27 타이어용 고무 조성물, 타이어용 고무 조성물의 제조 방법, 타이어용 고무 재료, 타이어용 고무 재료의 제조 방법 및 재생 고무
JP2025511047A JPWO2024204390A1 (https=) 2023-03-30 2024-03-27
CN202480015733.4A CN120787244A (zh) 2023-03-30 2024-03-27 轮胎用橡胶组合物、轮胎用橡胶组合物的制造方法、轮胎用橡胶材料、轮胎用橡胶材料的制造方法以及再生橡胶
EP24780492.5A EP4660234A1 (en) 2023-03-30 2024-03-27 Tire rubber composition, method for producing tire rubber composition, tire rubber material, method for producing tire rubber material, and reclaimed rubber

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2023055990 2023-03-30
JP2023-055990 2023-03-30

Publications (1)

Publication Number Publication Date
WO2024204390A1 true WO2024204390A1 (ja) 2024-10-03

Family

ID=92905678

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2024/012319 Ceased WO2024204390A1 (ja) 2023-03-30 2024-03-27 タイヤ用ゴム組成物、タイヤ用ゴム組成物の製造方法、タイヤ用ゴム材料、タイヤ用ゴム材料の製造方法および再生ゴム

Country Status (6)

Country Link
EP (1) EP4660234A1 (https=)
JP (1) JPWO2024204390A1 (https=)
KR (1) KR20250164167A (https=)
CN (1) CN120787244A (https=)
TW (1) TW202440771A (https=)
WO (1) WO2024204390A1 (https=)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006232885A (ja) * 2005-02-22 2006-09-07 Yokohama Rubber Co Ltd:The 使用済み架橋ゴムの脱硫方法及びそれより得られる再生ゴム組成物並びにそれを含むポリマー組成物
JP2013537257A (ja) * 2010-09-15 2013-09-30 キャボット コーポレイション シリカ含有充填剤を含むエラストマー複合材およびその製造方法
JP2018524450A (ja) * 2015-07-15 2018-08-30 キャボット コーポレイションＣａｂｏｔ Ｃｏｒｐｏｒａｔｉｏｎ シリカおよびカーボンブラックで補強されたエラストマー複合材の製造方法およびそれを含む製品
JP2022072813A (ja) * 2020-10-30 2022-05-17 株式会社トクヤマ ゴム組成物の製造方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7507389B2 (en) 2003-05-06 2009-03-24 Tokuyama Corporation Hydrophobic fumed silica
JP2016024397A (ja) 2014-07-23 2016-02-08 ソニー株式会社 ３次元スクリーン構造および３次元画像生成システム
JP6383602B2 (ja) 2014-08-11 2018-08-29 株式会社ブリヂストン ゴム組成物、架橋ゴム組成物及びタイヤ
JP6919210B2 (ja) 2017-02-03 2021-08-18 横浜ゴム株式会社 タイヤ用ゴム組成物

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006232885A (ja) * 2005-02-22 2006-09-07 Yokohama Rubber Co Ltd:The 使用済み架橋ゴムの脱硫方法及びそれより得られる再生ゴム組成物並びにそれを含むポリマー組成物
JP2013537257A (ja) * 2010-09-15 2013-09-30 キャボット コーポレイション シリカ含有充填剤を含むエラストマー複合材およびその製造方法
JP2018524450A (ja) * 2015-07-15 2018-08-30 キャボット コーポレイションＣａｂｏｔ Ｃｏｒｐｏｒａｔｉｏｎ シリカおよびカーボンブラックで補強されたエラストマー複合材の製造方法およびそれを含む製品
JP2022072813A (ja) * 2020-10-30 2022-05-17 株式会社トクヤマ ゴム組成物の製造方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP4660234A1 *

Also Published As

Publication number Publication date
CN120787244A (zh) 2025-10-14
JPWO2024204390A1 (https=) 2024-10-03
KR20250164167A (ko) 2025-11-24
EP4660234A1 (en) 2025-12-10
TW202440771A (zh) 2024-10-16

Similar Documents

Publication Publication Date Title
CN104245817B (zh) 轮胎用橡胶组合物、充气轮胎
JP2011190450A (ja) タイヤ用ゴム組成物
EP4393984A9 (en) Masterbatch, method for producing masterbatch, rubber composition for tires, method for producing rubber composition for tires, and rubber material for tires
WO2022091953A1 (ja) ゴム組成物の製造方法、ゴム組成物用フュームドシリカおよびゴム組成物
JP2009029961A (ja) ゴム組成物用マスターバッチおよびその製造方法
WO2024085032A1 (ja) マスターバッチ、マスターバッチの製造方法、タイヤ用ゴム組成物、タイヤ用ゴム組成物の製造方法、タイヤ用ゴム材料およびタイヤ
WO2024085031A1 (ja) マスターバッチ、マスターバッチの製造方法、タイヤ用ゴム組成物、タイヤ用ゴム組成物の製造方法、タイヤ用ゴム材料およびタイヤ
WO2018079312A1 (ja) タイヤ用ゴム組成物、及び空気入りタイヤ
JP2022072813A (ja) ゴム組成物の製造方法
WO2024204390A1 (ja) タイヤ用ゴム組成物、タイヤ用ゴム組成物の製造方法、タイヤ用ゴム材料、タイヤ用ゴム材料の製造方法および再生ゴム
JP2024008000A (ja) タイヤ用ゴム組成物およびそれを用いたタイヤ
JP7733288B2 (ja) ゴム組成物およびその製造方法
JP2025114080A (ja) タイヤ用ゴム組成物、タイヤ用ゴム材料およびタイヤ
JP2006265400A (ja) ゴム組成物の製造法及びそれを用いた空気入りタイヤ
JP7663797B2 (ja) タイヤ用ゴム組成物
JP7545024B2 (ja) タイヤ用ゴム組成物
WO2024204394A1 (ja) タイヤ用ゴム組成物およびタイヤ用ゴム材料
JP2012153787A (ja) タイヤ用ゴム組成物及び空気入りタイヤ
CN118043382A (zh) 母料、母料的制造方法、轮胎用橡胶组合物、轮胎用橡胶组合物的制造方法以及轮胎用橡胶材料
JP2026008383A (ja) タイヤ用ゴム材料およびタイヤ
JP7119639B2 (ja) ゴム組成物の製造方法
TW202607074A (zh) 輪胎用橡膠材料及輪胎
WO2026042638A1 (ja) コンベヤベルト用ゴム組成物、コンベヤベルト用ゴム材料およびコンベヤベルト
JP2010013551A (ja) タイヤトレッド用ゴム組成物

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 24780492

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 202517080110

Country of ref document: IN

WWE Wipo information: entry into national phase

Ref document number: 202480015733.4

Country of ref document: CN

ENP Entry into the national phase

Ref document number: 1020257029182

Country of ref document: KR

Free format text: ST27 STATUS EVENT CODE: A-0-1-A10-A15-NAP-PA0105 (AS PROVIDED BY THE NATIONAL OFFICE)

ENP Entry into the national phase

Ref document number: 2025511047

Country of ref document: JP

Kind code of ref document: A

WWE Wipo information: entry into national phase

Ref document number: 2025511047

Country of ref document: JP

WWP Wipo information: published in national office

Ref document number: 202517080110

Country of ref document: IN

WWP Wipo information: published in national office

Ref document number: 202480015733.4

Country of ref document: CN

NENP Non-entry into the national phase

Ref country code: DE

WWP Wipo information: published in national office

Ref document number: 2024780492

Country of ref document: EP