WO2016039276A1 - 変性ゴム、ゴム組成物、及びタイヤ - Google Patents
変性ゴム、ゴム組成物、及びタイヤ Download PDFInfo
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- WO2016039276A1 WO2016039276A1 PCT/JP2015/075257 JP2015075257W WO2016039276A1 WO 2016039276 A1 WO2016039276 A1 WO 2016039276A1 JP 2015075257 W JP2015075257 W JP 2015075257W WO 2016039276 A1 WO2016039276 A1 WO 2016039276A1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08C—TREATMENT OR CHEMICAL MODIFICATION OF RUBBERS
- C08C19/00—Chemical modification of rubber
- C08C19/22—Incorporating nitrogen atoms into the molecule
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- 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
- B60C1/0016—Compositions of the tread
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- 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
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/20—Compounding polymers with additives, e.g. colouring
-
- 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
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- 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
- C08K3/02—Elements
- C08K3/04—Carbon
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- 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
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- 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
- C08K5/16—Nitrogen-containing compounds
- C08K5/29—Compounds containing one or more carbon-to-nitrogen double bonds
-
- 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
-
- 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
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L15/00—Compositions of rubber derivatives
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L21/00—Compositions of unspecified rubbers
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- 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
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- 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
Definitions
- the present invention relates to a modified rubber, a rubber composition, and a tire.
- ⁇ Filler is a compounding agent used for the purpose of mixing with rubber to reinforce or increase the amount of rubber, or to give a special function to rubber.
- Carbon black typical as a filler contributes to improvement (reinforcing effect) of mechanical properties such as elastic modulus and breaking strength of rubber, and also has functions such as imparting conductivity to rubber. .
- inorganic fillers such as silica are known as fillers that can provide a rubber reinforcing effect similar to carbon black and that can provide a rubber composition with low exothermic properties, that is, low loss. Yes.
- the inorganic fillers such as silica are used in rubber compositions for low fuel consumption tires that are environmentally friendly.
- the inorganic filler particularly hydrophilic silica having a silanol group on the surface has a low affinity with the hydrophobic rubber, and the rubber composition Aggregates inside. Therefore, in order to improve the reinforcement by silica and obtain a low heat generation effect, it is necessary to increase the affinity between silica and rubber.
- synthetic rubber for example, see Patent Document 1 whose affinity with an inorganic filler is improved by terminal modification with a polar group, and a polar group-containing monomer is copolymerized to form an inorganic filler.
- Synthetic rubber for example, see Patent Document 2 with improved affinity is known.
- a method for modifying a natural rubber to introduce a polar group a method in which the natural rubber is oxidized and then modified with a hydrazide compound having a polar group (see, for example, Patent Document 3), a modified natural rubber having a polar group introduced therein and A method for further improving the dispersibility of silica by adding a silane coupling agent to a rubber composition containing silica is known (see, for example, Patent Document 4).
- the present invention has been made in view of the above problems of the prior art, and provides a modified rubber capable of improving low loss and breaking strength when a rubber composition containing an inorganic filler such as silica is used. It is to be.
- rubber is obtained by using a modified rubber obtained by modifying at least one rubber selected from the group consisting of natural rubber and synthetic rubber with a compound having a specific structure.
- a modified rubber obtained by modifying at least one rubber selected from the group consisting of natural rubber and synthetic rubber with a compound having a specific structure.
- the present invention is as follows.
- a modified rubber (A) obtained by modifying at least one rubber selected from the group consisting of natural rubber and synthetic rubber with a compound represented by formula (1).
- X is an acid forming a salt with the guanidine moiety.
- Modified rubber (A) [3] The modified rubber (A) according to [1] or [2], wherein the amount of the compound represented by the formula (1) is 0.01 to 10% by mass based on the total amount of the rubber.
- a rubber composition comprising the modified rubber (A) according to any one of [1] to [3], a filler containing an inorganic filler (B), and a silane coupling agent (C).
- [5] The rubber composition according to [4], wherein the inorganic filler (B) is silica.
- the modified rubber according to the present invention it is possible to obtain a rubber composition excellent in low loss property and breaking strength.
- the present embodiment a mode for carrying out the present invention (hereinafter simply referred to as “the present embodiment”) will be described in detail.
- the following embodiments are examples for explaining the present invention, and are not intended to limit the present invention to the following contents.
- the present invention can be implemented with appropriate modifications within the scope of the gist thereof.
- modified rubber (A) of the present embodiment is at least one rubber selected from the group consisting of natural rubber and synthetic rubber (hereinafter referred to as “raw rubber”, simply “rubber”. Is also modified with a compound represented by the formula (1) (hereinafter also referred to as “rubber modifier” or simply “modifier”).
- rubber modifier or simply “modifier”.
- X is an acid forming a salt with the guanidine moiety.
- any of natural rubber, synthetic rubber, and both can be used, but the effect of this embodiment is remarkably obtained especially when natural rubber is used.
- the synthetic rubber is a synthetic rubber whose affinity with an inorganic filler is improved by terminal modification with a polar group shown in Patent Document 1, or a polar group-containing single monomer shown in Patent Document 2 This is because natural rubber cannot be used for natural rubber, while it can easily introduce polar groups at the time of polymerization, as in the case of synthetic rubber that has been copolymerized to improve the affinity with inorganic fillers. is there.
- the natural rubber is not particularly limited, but any shape of sheet rubber and block rubber obtained by coagulating and drying natural rubber latex can be used as a raw material.
- the seat rubber is not particularly limited, but is classified according to the rating of “International Quality Packaging Standards for Natural Rubber Grades” (commonly called Green Book), and the ribbed smoked sheet (RSS) dried with smoke while being smoked, Examples include a crepe in which an air dry sheet (ADS) coagulated product obtained by drying a sheet with hot air is thoroughly washed with water and dried with hot air.
- TC rubber Technically Classified Rubber
- SP rubber Super Processing Rubber
- MG examples include rubber, PP crepe, softener, peptizer-added rubber, and the like.
- SMR Standard Malaysian Rubber
- SIR SIR of Indonesia
- TTR of Thailand SCR of Sri Lanka
- SSR of Singapore etc.
- These natural rubber raw materials may be used individually by 1 type, and may be used in combination of 2 or more type.
- rubber that has been solidified after oxidation treatment of natural rubber latex may be used, and oxidation of natural rubber latex can be performed by a known method.
- natural rubber latex dissolved in an organic solvent at a ratio of 1.0 to 30% by mass is oxidized by air in the presence of a metal-based oxidation catalyst to oxidize natural rubber latex. It can be performed.
- a carbonyl compound can be added to natural rubber latex for oxidation.
- air oxidation is performed as an oxidation method, as described in JP-A-9-136903, air oxidation may be performed in the presence of a radical generator in order to promote air oxidation.
- the radical generator is not particularly limited, but a peroxide radical generator, a redox radical generator, and an azo radical generator are preferably used.
- the synthetic rubber that can be used as a raw material for the modified rubber (A) is not particularly limited, but is 1,4-polybutadiene, 1,2-polybutadiene, 1,4-polyisoprene, 3,4-polyisoprene, styrene butadiene.
- diene rubbers having a double bond in the molecule such as rubber, terminal-modified styrene butadiene rubber, chloroprene rubber, nitrile rubber, ethylene propylene rubber, and ethylene propylene diene rubber.
- any of the above-described natural rubber, synthetic rubber, and modified rubber may be used. These may be used alone or in combination of two or more.
- the rubber modifier of the present embodiment is a compound represented by the above formula (1) (hereinafter also referred to as “1,3-diaminoguanidine salt” or “diaminoguanidine salt”).
- X is an acid forming a salt with the guanidine moiety.
- the factor that is excellent in low loss property is presumed as follows (however, the factor is not limited to this).
- the modified rubber obtained by reacting the modifier with rubber the hydrazine moiety derived from the modifier is bonded to the rubber. Since the modifier has a bifunctional hydrazine moiety, the breaking strength is improved due to the fact that each modifier is bonded to rubber. Since the modified rubber has a polar group such as an amino group, the affinity between the polar group of the inorganic filler, particularly in the case of silica, with the silanol group on the silica surface is improved, so that the adhesion between the rubber and the inorganic filler is improved.
- the rubber molded body is excellent in low loss.
- the guanidine moiety derived from the modifier acts as a polar group of the modified rubber and contributes to improving the adhesion between the rubber and the inorganic filler due to the strong formation of hydrogen bonds with the silanol groups on the silica surface. Yes. The formation of this strong hydrogen bond is attributed to the high polarity, basicity, etc. possessed by the guanidine moiety.
- 1,3-Diaminoguanidine exhibits strong basicity because the positive charge of the conjugate acid is resonance-stabilized by a plurality of nitrogen atoms present in the molecule, and is usually a complex (salt) with an acid. Exists.
- the 1,3-diaminoguanidine salt is not particularly limited.
- 1,3-diaminoguanidine hydrochloride 1,3-diaminoguanidine sulfate, 1,3-diaminoguanidine carbonate, and 1,3-diaminoguanidine nitrate are preferable.
- 1,3-diaminoguanidine hydrochloride and 1,3-diaminoguanidine carbonate are preferred because of their ease of purification.
- the modified rubber of this embodiment is not specifically limited, For example, it obtains by mixing the modifier and rubber
- a method of adding a modifier to a mixer, an extruder, a kneader, etc. any of a method of adding powder as it is, a method of adding it as a solution after dissolving it in a solvent, and a method of adding it as an emulsion solution may be used. .
- the reaction conditions for obtaining the modified rubber of this embodiment are not particularly limited, but the rubber and the modifier are preferably mixed and modified at a temperature of 20 to 180 ° C., and the temperature is set to 50 to 160 ° C. It is more preferable to mix and denature.
- the temperature is 20 ° C. to 180 ° C.
- the rubber kneading time is preferably adjusted to 0.5 to 30 minutes at the reaction temperature, and more preferably 2.0 to 10 minutes. If the time is 0.5 to 30 minutes, the rubber and the modifier tend to be sufficiently reacted without deteriorating the productivity.
- the reaction atmosphere is preferably carried out in the presence of oxygen such as air. This is because by kneading in the presence of oxygen, the rubber is partially oxidized and the reactivity with the modifier tends to be improved.
- the modified rubber of the present embodiment can be obtained by mixing the modifier and rubber at once with an extruder, a kneader, etc., or a method using a rubber solidified after oxidizing natural rubber latex,
- a technique that applies mechanical force to the raw rubber called mastication, to loosen the molecular agglomeration (association), cut the molecular chain and adjust the rubber plasticity to a level where it can be easily processed. Is preferable because the reactivity between the modifier and the rubber tends to be improved.
- a peptizer may be used.
- the rubber composition can also be obtained by blending various additives appropriately selected as necessary with the modifier, rubber, inorganic filler, and silane coupling agent, and mixing them using a mixer, an extruder, a kneader or the like. Some of the modified rubber is formed inside. This method is preferable in terms of working efficiency than the method of mixing the above modifier and rubber. By performing this operation, the rubber composition of the present embodiment can be obtained.
- the amount of the modifying agent used in producing the modified rubber of the present embodiment is such that the obtained modified rubber does not deteriorate the processability by introducing a small amount of polar groups uniformly into each molecule of the rubber. 0.01-10% by mass with respect to the total amount of raw rubber (100% by mass) from the standpoint of providing a rubber composition with improved affinity for fillers such as silica and carbon black and excellent low-loss properties.
- the content is 0.1 to 3.0% by mass.
- the rubber composition of this embodiment contains a modified rubber (A), a filler containing an inorganic filler (B), and a silane coupling agent (C).
- the rubber composition of the present embodiment is obtained by mixing a modified rubber (A), a filler containing an inorganic filler (B), and a silane coupling agent (C).
- the rubber composition of this embodiment is a modified rubber (A) obtained by mixing a modifier, raw rubber, a filler containing an inorganic filler (B), and a silane coupling agent (C). It is good also as a rubber composition containing).
- the mixing temperature is preferably in the range of 20 to 180 ° C., more preferably in the range of 50 to 160 ° C.
- the amount of the modifier used is preferably 0.01 to 10% by mass, and preferably 0.1 to 3.0% by mass with respect to the total amount of raw rubber (100% by mass). More preferably.
- the inorganic filler (B) in this embodiment is an inorganic compound containing at least one selected from silicon, oxides or hydroxides of typical metals or transition metals and hydrates thereof, and carbonates of these metals Point to.
- the inorganic filler (B) is not particularly limited as long as it is an inorganic filler used in the industry. Note that carbon black described later is not included in the inorganic filler (B) here, and does not hit the inorganic filler (B).
- Inorganic fillers are roughly classified into reinforcing fillers such as silica having active surfaces and surface-treated clay, and non-reinforcing fillers such as calcium carbonate, clay and talc.
- Specific examples of the inorganic filler (B) include silica, calcium carbonate, magnesium carbonate, aluminum oxide, aluminum hydroxide, aluminum silicate (clay), magnesium silicate (talc), calcium silicate, zinc white, and the like. It is done.
- the modified rubber it is preferably a reinforcing filler, and more preferably silica.
- the silica is not particularly limited, and wet silica (hydrous silicic acid), dry silica (anhydrous silicic acid) and the like can be used.
- the BET specific surface area is preferably 40 to 350 m 2 / g. If the BET specific surface area of silica is in this range, the particle diameter of silica is appropriate, the tensile strength is improved, and the hysteresis loss tends to decrease.
- the BET specific surface area can be measured according to JIS Z8830: 2013.
- carbon black can be added as a filler used in the rubber composition of the present embodiment in order to enhance the reinforcing effect.
- Carbon black is a different filler from the inorganic filler (B) and is clearly distinguished from the inorganic filler (B). Although it does not specifically limit as carbon black, The thing of various grades, such as GPF, FEF, SRF, HAF, ISAF, SAF, etc. are mentioned.
- the total content of the inorganic filler (B) and carbon black in the rubber composition of the present embodiment is not particularly limited, but the processability is not deteriorated and a sufficient low loss effect or reinforcing effect is obtained.
- the content is preferably in the range of 5.0 to 100 parts by mass and more preferably in the range of 20 to 80 parts by mass with respect to 100 parts by mass of the raw rubber.
- the silane coupling agent (C) of this embodiment is not particularly limited, but bis (3-triethoxysilylpropyl) tetrasulfide, bis (3-trimethoxysilylpropyl) tetrasulfide, bis (3-methyldimethoxysilyl) Propyl) tetrasulfide, bis (2-triethoxysilylethyl) tetrasulfide, bis (3-triethoxysilylpropyl) disulfide, bis (3-trimethoxysilylpropyl) disulfide, bis (3-triethoxysilylpropyl) trisulfide 3-hexanoylthiopropyltriethoxysilane, 3-octanoylthiopropyltriethoxysilane, 3-decanoylthiopropyltriethoxysilane, 3-lauroylthiopropyltriethoxysilane, 2-hexanoyl
- the rubber composition of the present embodiment is not particularly limited as a compounding agent usually used in the rubber industry, but is not limited to an anti-aging agent, softening agent An agent, a vulcanization accelerator, a vulcanization acceleration aid, a vulcanizing agent, and the like can be appropriately selected and blended within a range that does not impair the object of the present embodiment.
- an agent, a vulcanization accelerator, a vulcanization acceleration aid, a vulcanizing agent, and the like can be appropriately selected and blended within a range that does not impair the object of the present embodiment.
- these compounding agents commercially available products can be suitably used.
- the type of anti-aging agent is not particularly limited.
- naphthylamine, p-phenylenediamine, hydroquinone derivatives, bis, tris, polyphenol, diphenylamine, quinoline, monophenol, thiobisphenol, hindered Phenol-based compounds and the like can be mentioned, and p-phenylenediamine-based and diphenylamine-based amine-based antioxidants are preferable from the viewpoint of further anti-aging effects.
- the diphenylamine anti-aging agent is not particularly limited, but 4,4′-bis ( ⁇ -methylbenzyl) diphenylamine, 4,4′-bis ( ⁇ , ⁇ -dimethylbenzyl) diphenylamine, p- (p-toluenesulfonyl) Amido) diphenylamine, di (4-octylphenyl) amine, and the like.
- 4,4′-bis ( ⁇ -methylbenzyl) diphenylamine is more preferable from the viewpoint of higher antiaging effect.
- the p-phenylenediamine anti-aging agent is not particularly limited, but N, N'-diphenyl-p-phenylenediamine, N-isopropyl-N'-phenyl-p-phenylenediamine, N, N'-di -2-naphthyl-p-phenylenediamine, N-cyclohexyl-N′-phenyl-p-phenylenediamine, N-phenyl-N ′-(3-methacryloyloxy-2-hydroxypropyl) -p-phenylenediamine, N, N'-bis (1-methylheptyl) -p-phenylenediamine, N, N'-bis (1,4-dimethylpentyl) -p-phenylenediamine, N, N'-bis (1-ethyl-3-methyl) Pentyl) -p-phenylenediamine, N- (1,3-dimethylbutyl) -
- the content of the antioxidant in the rubber composition is preferably 0.1 to 5.0% by mass of the rubber component in the rubber composition.
- the type of softener is not particularly limited, and examples thereof include mineral oil-based softeners derived from petroleum and coal tar, vegetable oil-based softeners derived from fatty oils and pine trees, and synthetic resin-based softeners.
- the type of vulcanization accelerator is not particularly limited.
- thiazoles such as mercaptobenzothiazole and 2,2′-dibenzothiazolyl disulfide, N-cyclohexyl-2-benzothiazolylsulfenamide, N
- examples thereof include sulfenamides such as N′-dicyclohexyl-2-benzothiazolylsulfenamide and N′-tert-butyl-2-benzothiazolylsulfenamide, and guanidines such as diphenylguanidine.
- These vulcanization accelerators may be used alone or in combination of two or more.
- the content is preferably 0.1 to 5.0 parts by mass with respect to 100 parts by mass of the rubber component.
- stimulation adjuvant For example, a stearic acid and zinc white are mentioned.
- the content of the vulcanizing agent is preferably 0.1 to 5.0 parts by mass, more preferably 0.5 to 3.0 parts by mass, with respect to 100 parts by mass of the rubber component.
- the content of the vulcanizing agent is 0.1 parts by mass or less, sufficient vulcanization tends to be obtained, and when the content of the vulcanizing agent is 5.0 parts by mass or less, so-called It tends to be able to suppress the scorch time from being shortened and the scorching of the rubber during kneading.
- the tire according to the present embodiment is characterized by using the rubber composition, and the rubber composition is preferably used for a tread of a tire member.
- a tire using the rubber composition as a tread is excellent in fuel efficiency.
- the tire of the present embodiment is not particularly limited except that the above rubber composition is used for any of the tire members, and can be manufactured according to a conventional method.
- inert gas such as nitrogen, argon, helium other than normal or the air which adjusted oxygen partial pressure, can be used.
- Example 1 41.4 g of natural rubber coagulum (RSS # 1, manufactured by Kato Sansho Co., Ltd.) is put into a lab plast mill (manufactured by Toyo Seiki Seisakusho Co., Ltd.) heated to 30 ° C. in a mixer, and rotated at 60 rpm. The kneading was carried out for 1 minute with the lid closed, and for 4 minutes with the lid opened.
- a lab plast mill manufactured by Toyo Seiki Seisakusho Co., Ltd.
- the kneading was carried out for 1 minute with the lid closed, and for 4 minutes with the lid opened.
- 0.414 g (3.30 mmol) of 1,3-diaminoguanidine hydrochloride manufactured by Tokyo Chemical Industry Co., Ltd.
- was added and further kneaded for 3 minutes.
- a modified rubber 1 was obtained. At this time, the temperature of the rubber had reached 85 ° C.
- Unmodified 1,3-diaminoguanidine hydrochloride was extracted by heating and refluxing the modified rubber 1 (9.0 g) in 200 g of a 2: 1 mixed solvent of acetone and methanol for 2 hours. After the solvent was distilled off under reduced pressure, the residue was quantitatively analyzed by liquid chromatography. As a result, 0.044 g of bis (1-methylethylidene) diaminoguanidine hydrochloride, which is a condensate of 1,3-diaminoguanidine hydrochloride and acetone, was obtained. 0.21 mmol).
- the extracted unreacted 1,3-diaminoguanidine hydrochloride is 0.027 g (0.21 mmol), and 1,3-diaminoguanidine hydrochloride contained in the modified rubber 1 (9.0 g) before elution is extracted.
- the salt was 0.089 g (0.71 mmol), and 70 mol% of the added 1,3-diaminoguanidine hydrochloride reacted with natural rubber.
- the amount of 1,3-diaminoguanidine added in the modified rubber 1 was 0.7% by mass with respect to the solid rubber component in the natural rubber raw material.
- Example 2 Comparative Examples 1 and 2
- modified rubber 1, 2 or unmodified rubber 1, silica, silane coupling agent, zinc white, and stearic acid were kneaded at 140 ° C. for 5 minutes in the above lab plast mill.
- sulfur and a vulcanization accelerator were added and kneaded, and after reaching 90 ° C., the mixture was further kneaded for 3 minutes to prepare a rubber composition.
- a vulcanized rubber composition was obtained by vulcanization at 145 ° C. and 10 MPa for 38 to 40 minutes using a press machine (manufactured by Kitagawa Seiki Co., Ltd.).
- silane coupling agent bis (3-triethoxysilylpropyl) tetrasulfide (Evonik Japan Co., Ltd.) Zinc flower (Wako Pure Chemical Industries, Ltd.) Stearic acid (Wako Pure Chemical Industries, Ltd.) Sulfur (Hosoi Chemical Co., Ltd., 250 ⁇ m)
- Vulcanization accelerator (CBS) N-cyclohexyl-2-benzothiazolylsulfenamide (manufactured by Wako Pure Chemical Industries, Ltd.)
- Denaturant 1 1,3-diaminoguanidine hydrochloride (manufactured by Tokyo Chemical Industry Co., Ltd.)
- Denaturant 2 Aminoguanidine hydrochloride (manufactured by Tokyo Chemical Industry Co., Ltd.)
- each component of the compounding prescription indicates part by mass.
- the rubber compositions of the examples are superior in low exothermic property and have a tensile strength at break as compared with a rubber composition mixed with a diene rubber not modified with 1,3-diaminoguanidine salt. It was at least confirmed to be large.
- each component of the compounding prescription indicates part by mass.
- the modified rubber and rubber composition according to the present invention can be used as materials for various tire members including tires.
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Abstract
Description
天然ゴム及び合成ゴムからなる群より選ばれる少なくとも1種のゴムを、式(1)で表される化合物によって変性させて得られる、変性ゴム(A)。
[2]
前記天然ゴム及び合成ゴムからなる群より選ばれる少なくとも1種のゴムと前記式(1)で表される化合物とを、20~180℃の温度下で混合して得られる、[1]に記載の変性ゴム(A)。
[3]
前記式(1)で表される化合物の使用量が、前記ゴムの総量に対して、0.01~10質量%である、[1]又は[2]に記載の変性ゴム(A)。
[4]
[1]~[3]のいずれかに記載の変性ゴム(A)、無機充填材(B)を含む充填材、及びシランカップリング剤(C)を含有する、ゴム組成物。
[5]
前記無機充填材(B)がシリカである、[4]に記載のゴム組成物。
[6]
前記充填材がカーボンブラックを含む、[4]又は[5]に記載のゴム組成物。
[7]
前記式(1)で表される化合物と、前記天然ゴム及び合成ゴムからなる群より選ばれる少なくとも1種のゴムと、前記無機充填材(B)を含む充填材と、前記シランカップリング剤(C)とを混合して得られ、
[4]~[6]のいずれかに記載の変性ゴム(A)を少なくとも一部含有する、ゴム組成物。
[8]
混合時の温度が、20~180℃の範囲にある、[7]に記載のゴム組成物。
[9]
前記式(1)で表される化合物の使用量が、前記ゴムの総量に対して、0.01~10質量%である、[7]又は[8]に記載のゴム組成物。
[10]
[4]~[9]のいずれかに記載のゴム組成物をタイヤ部材のトレッドに用いた、タイヤ。
本実施形態の変性ゴム(A)(以下、単に「変性ゴム」ともいう。)は、天然ゴム及び合成ゴムからなる群より選ばれる少なくとも1種のゴム(以下、「原料ゴム」、単に「ゴム」ともいう。)を、式(1)で表される化合物(以下、「ゴム変性剤」、単に「変性剤」ともいう。)によって変性させて得られる。
本実施形態のゴム組成物は、変性ゴム(A)、無機充填材(B)を含む充填材、及びシランカップリング剤(C)を含有する。
本実施形態のタイヤは、上記ゴム組成物を用いたことを特徴とし、上記ゴム組成物をタイヤ部材のトレッドに用いることが好ましい。上記ゴム組成物をトレッドに用いたタイヤは、低燃費性に優れる。なお、本実施形態のタイヤは、上述のゴム組成物をタイヤ部材の何れかに用いる以外特に制限はなく、常法に従って製造することができる。また、該タイヤに充填する気体としては、通常の或いは酸素分圧を調整した空気の他、窒素、アルゴン、ヘリウム等の不活性ガスを用いることができる。
ミキサー内を30℃に加熱したラボプラストミル((株)東洋精機製作所製)に、天然ゴム凝固体(RSS#1、加藤産商(株)製)41.4gを投入し、回転数60rpmで蓋を閉めた状態で1分間、蓋を開けた状態で4分間混練した。せん断発熱によりゴムの温度が80℃まで上昇したところで、1,3-ジアミノグアニジン塩酸塩(東京化成工業(株)製)0.414g(3.30mmol)を投入し、更に3分間混練することにより、変性ゴム1を得た。この時、ゴムの温度は85℃に達していた。
ミキサー内を30℃に加熱したラボプラストミル((株)東洋精機製作所製)に、天然ゴム凝固体(RSS#1、加藤産商(株)製)41.4gを投入し、回転数60rpmで蓋を閉めた状態で1分間、蓋を開けた状態で4分間混練した。せん断発熱によりゴムの温度が80℃まで上昇したところで、アミノグアニジン塩酸塩(東京化成工業(株)製)0.414g(3.75mmol)を投入し、更に3分間混練することにより、変性ゴム2を得た。この時、ゴムの温度は85℃に達していた。
反応器内を30℃に加熱したラボプラストミルに、天然ゴム凝固体(RSS#1)41.4gを投入し、回転数60rpmで蓋を閉めた状態で1分間、蓋を開けた状態で4分間混練した。せん断発熱によりゴムの温度が80℃に達した後、更に3分間混練することにより、未変性ゴム1を得た。この時、ゴムの温度は85℃に達していた。
表1の組成に従い、最初に変性ゴム1、2又は未変性ゴム1、シリカ、シランカップリング剤、亜鉛華、ステアリン酸を上記ラボプラストミルにて、140℃で5分間混練した後、一旦55℃に冷却しこれに硫黄と加硫促進剤を投入、混練し、90℃に到達後、さらに3分間混練してゴム組成物を調製した。続いて、プレス機(北川精機(株)製)を用いて145℃、10MPaで38~40分間加硫することにより加硫ゴム組成物を得た。以下に用いた成分について示す。
シリカ:商品名「ニップシールAQ」(BET比表面積=207m2/g、東ソー・シリカ(株)製)
シランカップリング剤:ビス(3-トリエトキシシリルプロピル)テトラスルフィド(エボニック ジャパン(株)製)
亜鉛華(和光純薬工業(株)製)
ステアリン酸(和光純薬工業(株)製)
硫黄(細井化学工業(株)製、250μm)
加硫促進剤(CBS):N-シクロヘキシル-2-ベンゾチアゾリルスルフェンアミド(和光純薬工業(株)製)
加硫促進剤(DPG):ジフェニルグアニジン(和光純薬工業(株)製)
表2の組成に従い、最初に天然ゴム凝固体(RSS#1)、シリカ、シランカップリング剤、亜鉛華、ステアリン酸、変性剤1、2を上記ラボプラストミルにて、140℃で5分間混練した後、一旦55℃に冷却しこれに硫黄と加硫促進剤を投入し、90℃で3分間混練してゴム組成物を調製した。続いて、プレス機(北川精機(株)製)を用いて145℃、10MPaで37~39分間加硫することにより加硫ゴム組成物を得た。以下に用いた成分について示す(表1で用いたものについては同じ。)。
変性剤1:1,3-ジアミノグアニジン塩酸塩(東京化成工業(株)製)
変性剤2:アミノグアニジン塩酸塩(東京化成工業(株)製)
(1)発熱性
上記加硫ゴム組成物に対し、動的粘弾性測定装置(セイコーインスツル(株)製DMS6100)を用い、温度50℃、歪み0.5%、周波数10Hzで損失正接(tanδ)を測定し、表1の比較例2、表2の比較例4の値を100としてそれぞれ指数表示した。指数値が小さい程、tanδが低く、ゴム組成物が低発熱性であることを示す。
(2)引張り破断強度
上記加硫ゴム組成物に対し、JIS K6251:2010に準拠して引張り試験を行い、引張り破断強度を測定し、表1の比較例1、表2の比較例4の値を100としてそれぞれ指数表示した。指数値が大きい程、引張り破断強度が大きいことを示す。
Claims (10)
- 前記天然ゴム及び合成ゴムからなる群より選ばれる少なくとも1種のゴムと前記式(1)で表される化合物とを、20~180℃の温度下で混合して得られる、請求項1に記載の変性ゴム(A)。
- 前記式(1)で表される化合物の使用量が、前記ゴムの総量に対して、0.01~10質量%である、請求項1又は2に記載の変性ゴム(A)。
- 請求項1~3のいずれか一項に記載の変性ゴム(A)、無機充填材(B)を含む充填材、及びシランカップリング剤(C)を含有する、ゴム組成物。
- 前記無機充填材(B)がシリカである、請求項4に記載のゴム組成物。
- 前記充填材がカーボンブラックを含む、請求項4又は5に記載のゴム組成物。
- 前記式(1)で表される化合物と、前記天然ゴム及び合成ゴムからなる群より選ばれる少なくとも1種のゴムと、前記無機充填材(B)を含む充填材と、前記シランカップリング剤(C)とを混合して得られ、
請求項4~6のいずれか一項に記載の変性ゴム(A)を少なくとも一部含有する、ゴム組成物。 - 混合時の温度が、20~180℃の範囲にある、請求項7に記載のゴム組成物。
- 前記式(1)で表される化合物の使用量が、前記ゴムの総量に対して、0.01~10質量%である、請求項7又は8に記載のゴム組成物。
- 請求項4~9のいずれか一項に記載のゴム組成物をタイヤ部材のトレッドに用いた、タイヤ。
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JP2018035326A (ja) * | 2016-09-02 | 2018-03-08 | 三菱瓦斯化学株式会社 | ゴム組成物 |
JP2018035325A (ja) * | 2016-09-02 | 2018-03-08 | 三菱瓦斯化学株式会社 | ゴム組成物 |
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KR20210049715A (ko) | 2018-08-24 | 2021-05-06 | 미츠비시 가스 가가쿠 가부시키가이샤 | 고무 조성물 및 타이어 |
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