WO2010150557A1 - ゴムクローラ - Google Patents
ゴムクローラ Download PDFInfo
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- WO2010150557A1 WO2010150557A1 PCT/JP2010/004247 JP2010004247W WO2010150557A1 WO 2010150557 A1 WO2010150557 A1 WO 2010150557A1 JP 2010004247 W JP2010004247 W JP 2010004247W WO 2010150557 A1 WO2010150557 A1 WO 2010150557A1
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- WIPO (PCT)
- Prior art keywords
- rubber
- group
- sulfenamide
- vulcanization
- parts
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- 0 *c1c(*)c(S)c(*)c2c1nc(*N(*)I)[s]2 Chemical compound *c1c(*)c(S)c(*)c2c1nc(*N(*)I)[s]2 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D55/00—Endless track vehicles
- B62D55/08—Endless track units; Parts thereof
- B62D55/18—Tracks
- B62D55/24—Tracks of continuously flexible type, e.g. rubber belts
- B62D55/244—Moulded in one piece, with either smooth surfaces or surfaces having projections, e.g. incorporating reinforcing elements
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D277/00—Heterocyclic compounds containing 1,3-thiazole or hydrogenated 1,3-thiazole rings
- C07D277/60—Heterocyclic compounds containing 1,3-thiazole or hydrogenated 1,3-thiazole rings condensed with carbocyclic rings or ring systems
- C07D277/62—Benzothiazoles
- C07D277/68—Benzothiazoles with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached in position 2
- C07D277/70—Sulfur atoms
- C07D277/74—Sulfur atoms substituted by carbon atoms
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D277/00—Heterocyclic compounds containing 1,3-thiazole or hydrogenated 1,3-thiazole rings
- C07D277/60—Heterocyclic compounds containing 1,3-thiazole or hydrogenated 1,3-thiazole rings condensed with carbocyclic rings or ring systems
- C07D277/62—Benzothiazoles
- C07D277/68—Benzothiazoles with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached in position 2
- C07D277/70—Sulfur atoms
- C07D277/76—Sulfur atoms attached to a second hetero atom
- C07D277/78—Sulfur atoms attached to a second hetero atom to a second sulphur atom
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D277/00—Heterocyclic compounds containing 1,3-thiazole or hydrogenated 1,3-thiazole rings
- C07D277/60—Heterocyclic compounds containing 1,3-thiazole or hydrogenated 1,3-thiazole rings condensed with carbocyclic rings or ring systems
- C07D277/62—Benzothiazoles
- C07D277/68—Benzothiazoles with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached in position 2
- C07D277/70—Sulfur atoms
- C07D277/76—Sulfur atoms attached to a second hetero atom
- C07D277/80—Sulfur atoms attached to a second hetero atom to a nitrogen atom
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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
- C08K5/36—Sulfur-, selenium-, or tellurium-containing compounds
- C08K5/45—Heterocyclic compounds having sulfur in the ring
- C08K5/46—Heterocyclic compounds having sulfur in the ring with oxygen or nitrogen in the ring
- C08K5/47—Thiazoles
Definitions
- the present invention relates to a rubber crawler using a rubber composition containing a specific sulfenamide vulcanization accelerator and having excellent adhesion durability as a treat rubber.
- rubber crawlers have been adopted for traveling parts such as agricultural machinery and construction machinery. Since such rubber crawlers are required to have a strength that can withstand harsh usage environments, a composite material (rubber-metal reinforcing material) in which a metal reinforcing material such as a steel cord is coated with treat rubber is used, and the metal reinforcing material is used for rubber Durability is improved while reinforcing.
- a composite material rubber-metal reinforcing material in which a metal reinforcing material such as a steel cord is coated with treat rubber is used, and the metal reinforcing material is used for rubber Durability is improved while reinforcing.
- a method of simultaneously bonding rubber and metal a method of simultaneously bonding rubber and metal, so-called direct vulcanization bonding method.
- sulfenamide-based vulcanization accelerators that delay the vulcanization reaction are useful for the simultaneous vulcanization of rubber and metal bonding, and the slowest effect on the most vulcanization reaction currently on the market.
- the vulcanization accelerator that imparts properties include N, N′-dicyclohexyl-2-benzothiazolylsulfenamide (hereinafter abbreviated as “DCBS”).
- a sulfenamide vulcanization accelerator and a vulcanization retarder such as N- (cyclohexylthio) phthalimide (hereinafter abbreviated as “CTP”) are used in combination. It has also been done.
- the sulfenamide-based vulcanization accelerator other than the DCBS include, for example, bissulfenamide represented by a specific formula (see Patent Document 1) and a benzothiazole using an amine derived from natural fats and oils as a raw material. Rilsulfenamide vulcanization accelerators (see Patent Document 2) are also known.
- a sulfenamide vulcanization accelerator such as DCBS has a vulcanization rate.
- CBS N-cyclohexyl-2-benzothiazylsulfenamide
- TBBS Nt-butylbenzothiazole-2-sulfenamide
- a sulfenamide-based vulcanization accelerator such as “abbreviated”) is preferably used.
- the vulcanization reaction may proceed before the adhesion reaction between the rubber and the metal reinforcing material is completed. In some cases, sufficient adhesion cannot be obtained.
- the conventional vulcanization accelerator is used, the Mooney viscosity tends to increase more than necessary, and a favorable kneading operation tends not to be realized, and it is difficult to ensure a suitable Mooney scorch time at the same time. Conceivable.
- a sheet-like rubber-metal reinforcing material having a long strip shape is produced while the unvulcanized part remains partially in the vulcanization process, and the unvulcanized part is overlapped. Since the rubber-metal reinforcing material is vulcanized again after being formed into an endless shape, at least a part of the rubber-metal reinforcing material must be vulcanized several times. Therefore, the adhesion between the rubber and the reinforcing material in the rubber crawler is required to have a high heat resistance enough to withstand even if vulcanized several times, and further under high humidity conditions that tend to be imposed during use It is desirable that no deterioration occurs.
- the present invention provides a vulcanization acceleration having an appropriate vulcanization delay effect without using a vulcanization retarder such as CTP which may cause problems such as deterioration of rubber physical properties after vulcanization and blooming.
- a vulcanization retarder such as CTP which may cause problems such as deterioration of rubber physical properties after vulcanization and blooming.
- An object of the present invention is to provide a highly durable rubber crawler using the obtained rubber composition.
- the present inventor employs a specific sulfenamide-based vulcanization accelerator and maintains a moderate vulcanization delay effect and good workability while being high between the metal reinforcing material.
- the present inventors have found a rubber crawler using a rubber composition capable of exhibiting adhesive durability and have completed the present invention. That is, the rubber crawler of the present invention has 0 to 10 parts by mass of the sulfenamide-based vulcanization accelerator represented by the formula (I) and 100 parts by mass of the cobalt-containing compound based on 100 parts by mass of the rubber component.
- a rubber composition containing 0.03 to 3 parts by mass and sulfur in an amount of 0.3 to 10 parts by mass is used for the treat rubber.
- R 1 represents a branched alkyl group having 3 to 12 carbon atoms
- R 2 represents a linear alkyl group having 1 to 10 carbon atoms
- R 3 to R 6 represent a hydrogen atom, a carbon atom, A linear alkyl group or alkoxy group having 1 to 4 carbon atoms, or a branched alkyl group or alkoxy group having 3 to 4 carbon atoms, which may be the same as or different from each other, and n represents 0 or 1 , X represents 1 or 2.
- R 1 may be a tert-butyl group
- R 2 may be a linear alkyl group having 1 to 6 carbon atoms
- n may be 0, and R 1 may be tert-butyl.
- It may be a butyl group
- R 2 may be a linear alkyl group having 1 to 4 carbon atoms
- n may be 0.
- all of R 3 to R 6 may be hydrogen atoms.
- the rubber component preferably contains at least one selected from the group consisting of natural rubber, polybutadiene rubber, polyisoprene rubber, and acrylonitrile-butadiene rubber.
- the rubber composition using the vulcanization accelerator having an appropriate vulcanization delay effect is adopted for the treat rubber, the increase in Mooney viscosity is effectively suppressed in the rubber composition.
- the kneading operation is facilitated and a suitable Mooney scorch time can be maintained.
- such a rubber composition does not require the use of a vulcanization retarder such as CTP, which may cause problems such as degradation of rubber physical properties after vulcanization and blooming, and the appearance and adhesion of vulcanized rubber. There is no risk of adverse effects. Therefore, while maintaining good workability, it is possible to reduce the generation of rubber burns as much as possible, and to obtain a rubber composition that can exhibit high adhesiveness even after heat aging and under high humidity. Therefore, by using such a rubber composition for treat rubber, a rubber crawler that retains high adhesion durability between rubber and metal reinforcement even when exposed to harsh manufacturing and use environments is realized. can do.
- the rubber crawler of the present invention has a sulfenamide-based vulcanization accelerator represented by the formula (I) of 0.1 to 10 parts by mass and a cobalt-containing compound as a cobalt amount of 0.03 with respect to 100 parts by mass of the rubber component.
- a rubber composition containing 3 to 3 parts by mass and 0.3 to 10 parts by mass of sulfur is used as a treat rubber.
- the rubber crawler of the present invention uses a rubber composition in which treat rubber is blended with a sulfenamide vulcanization accelerator represented by the above formula (I).
- a sulfenamide-based vulcanization accelerator represented by the above formula (I).
- Such a sulfenamide-based vulcanization accelerator has an appropriate vulcanization delay effect, and can effectively suppress an increase in Mooney viscosity and ensure a suitable Mooney scorch time.
- it is excellent in adhesion durability in direct vulcanization adhesion with a reinforcing material such as a steel cord, and can exhibit adhesion enough to withstand heat aging.
- R 1 in the sulfenamide vulcanization accelerator represented by the above formula (I) represents a branched alkyl group having 3 to 12 carbon atoms.
- the sulfenamide-based vulcanization accelerator has good vulcanization acceleration performance and can improve adhesion performance.
- R 1 examples include isopropyl, isobutyl, triisobutyl, sec-butyl, tert-butyl, isoamyl (isopentyl), neopentyl, tert-amyl (tert-pentyl).
- a tert-alkyl group having 1 to 12 carbon atoms is preferable from the viewpoint of obtaining a suitable Mooney scorch time, and in particular, a tert-butyl group, a tert-amyl group (tert-pentyl group), A tert-dodecyl group and a triisobutyl group are preferable.
- the tert-butyl group has a good balance between improving adhesion and maintaining a vulcanization rate equivalent to that of a sulfenamide-based vulcanization accelerator that has been used suitably. It is most preferable from the viewpoint of exhibiting.
- n 0 or 1
- X in the formula (I) represents an integer of 1 or 2.
- R 1 in the above formula (I) is a tert-butyl group and n is 0, R 1 is a cyclohexyl group, and in the vicinity of —N— as compared with DCBS where n is 0 It is considered that the former is more bulky and can give a more preferable Mooney scorch time.
- R 2 described later, by appropriately controlling the bulk of the substituent located in the vicinity of —N—, a suitable vulcanization rate and good adhesiveness are balanced in consideration of human accumulation. It becomes possible to demonstrate.
- R 2 in the sulfenamide vulcanization accelerator represented by the above formula (I) represents a linear alkyl group having 1 to 10 carbon atoms. If R 2 is a branched alkyl group, both R 1 and R 2 become branched alkyl groups, so that even if synthesized, stability may not be maintained satisfactorily, and heat resistant adhesiveness may be reduced. In particular, when both R 1 and R 2 are tert-butyl groups, even their synthesis becomes difficult. Therefore, if R 2 is a straight-chain alkyl group having 1 to 10 carbon atoms as described above, the combination with the branched alkyl group R 1 is good, and the bulk of the substituent located in the vicinity of —N— is increased. It is possible to effectively control and exhibit a suitable vulcanization speed and good adhesion performance in a well-balanced manner while taking into consideration human body accumulation.
- R 2 examples include methyl group, ethyl group, n-propyl group, n-butyl group, n-amyl group (n-pentyl group), n-hexyl group, n-heptyl group, and n-octyl group. , Nonyl group, decyl group, undecyl group, dodecyl group and the like.
- the number of carbon atoms is preferably 1 to 4 and the number of carbon atoms is preferably 1 to 3 from the viewpoints of the ease of synthesis, raw material costs, etc., and consideration of human accumulation by maintaining appropriate concentration. Is more preferable, and most preferable is C 1-2.
- R 2 in the above formula (I) is a conventional sulfenamide vulcanization accelerator such as H
- the vulcanization speed may be too high and good adhesiveness tends not to be obtained. is there.
- R 2 is a conventional sulfenamide vulcanization accelerator such as a bulky group such as a cyclohexyl group or a long chain group outside the above range, the vulcanization rate tends to be too slow. is there.
- R 1 is a tert-butyl group and n is 0, as R 2
- optimum R 2 is improved adhesion and accelerated sulfenamide-based vulcanization conventionally used.
- a methyl group and an ethyl group can be mentioned from the viewpoint of exhibiting a good balance of the vulcanization rate as that of the agent and taking into consideration human accumulation.
- R 1 is a functional group other than a branched alkyl group having 3 to 12 carbon atoms (for example, n-octadecyl group, etc.) or carbon number Is a branched alkyl group having more than 12 and R 2 is a functional group other than a linear alkyl group having 1 to 10 carbon atoms (for example, n-octadecyl group, etc.) or linear or branched having more than 10 carbon atoms.
- R 3 to R 6 in the above formula (I) are a hydrogen atom, a linear alkyl group having 1 to 4 carbon atoms or an alkoxy group, or a branched alkyl group having 3 to 4 carbon atoms or an alkoxy group. They may be the same or different.
- R 3 and R 5 are each a linear alkyl group or alkoxy group having 1 to 4 carbon atoms, or a branched alkyl group or alkoxy group having 3 to 4 carbon atoms. Preferably there is.
- R 3 to R 6 are an alkyl group or alkoxy group having 1 to 4 carbon atoms, it is preferably 1 carbon atoms, and all of R 3 to R 6 are preferably H.
- R 3 to R 6 in the above formula (I) include methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, sec-butyl group, tert-butyl group, Examples include methoxy group, ethoxy group, n-propoxy group, isopropoxy group, n-butoxy group, isobutoxy group, sec-butoxy group, and tert-butoxy group.
- the log Pow value (1-octanol / water partition coefficient) of the sulfenamide-based vulcanization accelerator is preferably as small as possible from the viewpoint of maintaining proper concentration, and specifically, in the above formula (I) As the number of carbon atoms of R 1 and R 2 is smaller, the log Pow value tends to be smaller.
- R 1 in the formula (I) used in the present invention is a t-butyl group and n is 0, a vulcanization equivalent to a sulfenamide-based vulcanization accelerator conventionally used suitably From the viewpoint of exhibiting good adhesion performance while maintaining speed and considering human body accumulation, R 2 in formula (I) preferably has 1 to 2 carbon atoms.
- the log Pow value (1-octanol / water partition coefficient) is a value generally obtained by one of the simple measuring methods for evaluating the concentration of chemical substances. It means a value obtained from the chemical substance concentration ratio Pow in the two phases when a chemical substance is added to achieve an equilibrium state. Pow is expressed by the following equation, and the logarithmic value of Pow is the log Pow value.
- Pow Co / Cw Co: Test substance concentration in the 1-octanol layer
- Cw Test substance concentration in the water layer
- the log Pow value is based on JIS Z7260-117 (2006), and Pow is measured using high performance liquid chromatography. Can be sought.
- representative examples of the sulfenamide vulcanization accelerator represented by the above formula (I) include N-methyl-Nt-butylbenzothiazole-2-sulfenamide (BMBS), N— Ethyl-Nt-butylbenzothiazole-2-sulfenamide (BEBS), Nn-propyl-Nt-butylbenzothiazole-2-sulfenamide, Nn-butyl-Nt-butyl Benzothiazole-2-sulfenamide (BBBS), N-methyl-N-isoamylbenzothiazole-2-sulfenamide, N-ethyl-N-isoamylbenzothiazole-2-sulfenamide, Nn-propyl- N-isoamylbenzothiazole-2-sulfenamide, Nn-butyl-N-isoamylbenzothiazole-2-sulfenamide N-methyl-N-tert-amy
- N-methyl-Nt-butylbenzothiazole-2-sulfenamide (BMBS) and N-ethyl-Nt-butylbenzothiazole-2-sulfenamide are preferred in terms of improving adhesive performance.
- BEBS Nn-propyl-Nt-butylbenzothiazole-2-sulfenamide are preferred.
- N-methyl-Nt-butylbenzothiazole-2-sulfenamide (BMBS)
- N-ethyl-Nt-butylbenzothiazole- in terms of having the longest Mooney scorch time and excellent adhesion performance 2-sulfenamide (BEBS)
- N-ethyl-Nt-butylbenzothiazole-2-sulfenamide (BEBS) is most preferred.
- sulfenamide vulcanization accelerators include N-tert-butyl-2-benzothiazole sulfenamide (TBBS), N-cyclohexyl-2-benzothiazole sulfenamide (CBS), dibenzothiazolyl disulfide (MBTS). ) And other general-purpose vulcanization accelerators.
- the content of the sulfenamide vulcanization accelerator is from 0.1 to 10 parts by weight, preferably from 0.1 to 0.7 parts by weight, more preferably from 0.1 to 100 parts by weight, based on 100 parts by weight of the rubber component.
- the amount is 0.6 parts by mass. If the content of the vulcanization accelerator is less than 0.1 parts by mass, the vulcanization may not be sufficiently performed. On the other hand, if it exceeds 10 parts by mass, problems such as blooming are likely to occur, and rubber burns are generated. And there is a risk of lowering the adhesion with the reinforcing material.
- Preferred examples of the method for producing the sulfenamide-based vulcanization accelerator include the following methods. That is, N-chloroamine prepared in advance by the reaction of the corresponding amine and sodium hypochlorite and bis (benzothiazol-2-yl) disulfide are reacted in an appropriate solvent in the presence of an amine and a base. If an amine is used as the base, neutralize and return to the free amine, and then perform appropriate post-treatments such as filtration, washing, concentration, and recrystallization according to the properties of the resulting reaction mixture. Sulfenamide is obtained.
- Examples of the base used in this production method include starting amines used in excess, tertiary amines such as triethylamine, alkali hydroxides, alkali carbonates, alkali bicarbonates, sodium alkoxides, and the like.
- the reaction is carried out using excess raw material amine as a base or tertiary amine triethylamine, neutralizing the hydrochloride formed with sodium hydroxide, taking out the target product, and then removing the amine from the filtrate.
- a method of reuse is desirable.
- methanol is particularly desirable.
- BEBS N-ethyl-Nt-butylbenzothiazole-2-sulfenamide
- an aqueous sodium hypochlorite solution was added dropwise to Nt-butylethylamine at 0 ° C. or lower and stirred for 2 hours.
- Bis (benzothiazol-2-yl) disulfide, Nt-butylethylamine and the oil layer described above were suspended in methanol and stirred for 2 hours under reflux. After cooling, the solution is neutralized with sodium hydroxide, filtered, washed with water, concentrated under reduced pressure, and recrystallized to obtain the target BEBS (white solid).
- the above-mentioned rubber composition is blended with a cobalt-containing compound that greatly contributes to the improvement of the initial adhesion performance.
- cobalt-containing compounds include cobalt salts of organic acids and cobalt salts of inorganic acids, such as cobalt chloride, cobalt sulfate, cobalt nitrate, cobalt phosphate, and cobalt chromate.
- cobalt salts of organic acids such as cobalt chloride, cobalt sulfate, cobalt nitrate, cobalt phosphate, and cobalt chromate.
- a cobalt salt of an organic acid is preferable from the viewpoint of further improving the initial adhesion performance. These may be used alone or in combination of two or more.
- examples of the cobalt salt of the organic acid include at least one of cobalt naphthenate, cobalt stearate, cobalt neodecanoate, cobalt rosinate, cobalt versatate, cobalt tall oilate, and the like.
- the organic acid cobalt may be a complex salt in which a part of the organic acid is replaced with boric acid.
- a commercially available product name “Manobond” manufactured by OMG may be used.
- the content of the cobalt-containing compound is 0.03 to 3 parts by mass, preferably 0.03 to 0.06 parts by mass, based on 100 parts by mass of the rubber component, as the amount of cobalt. If the cobalt content is less than 0.03 parts by mass, sufficient adhesion cannot be improved, while if it exceeds 3 parts by mass, the heat resistance after heat aging may be reduced.
- sulfur is added to the rubber composition as a vulcanizing agent.
- the content thereof is 0.3 to 10 parts by mass, preferably 1.0 to 7.0 parts by mass, more preferably 3.0 to 5.0 parts by mass with respect to 100 parts by mass of the rubber component. . If the sulfur content is less than 0.3 parts by mass, vulcanization may not be achieved sufficiently. On the other hand, if it exceeds 10 parts by mass, the aging performance of the rubber may be lowered, which is not preferable.
- the rubber component of the rubber composition is not particularly limited as long as it is a rubber generally used in rubber products, and can be sulfur-crosslinked if it is a rubber component having a double bond in the main chain.
- the sulfenamide-based vulcanization accelerator represented by the above formula functions effectively.
- natural rubber or synthetic rubber is used.
- Specific examples of such synthetic rubber include polybutadiene rubber, polyisoprene rubber, acrylonitrile-butadiene rubber, chloroprene rubber, styrene-butadiene rubber, ethylene-propylene-diene copolymer, and halogenated butyl rubber.
- At least one of natural rubber, polybutadiene rubber, polyisoprene rubber, and acrylonitrile-butadiene rubber is included from the viewpoint of adhesion to a metal reinforcing material such as a steel cord. Furthermore, it is more desirable to use natural rubber from the viewpoint of improving the durability of the rubber crawler.
- additives other than the above components may be appropriately blended as necessary.
- additives include vulcanizing agents other than the above sulfur, vulcanization accelerators other than the above vulcanization accelerators or vulcanization acceleration aids, reinforcing fillers such as carbon black, anti-aging agents, and plasticizers. Petroleum resins, waxes, antioxidants, oils, lubricants, ultraviolet absorbers, dispersants, compatibilizing agents, homogenizing agents and the like.
- Such a rubber composition can be produced by kneading these components with, for example, a Banbury mixer, a kneader or the like.
- the rubber crawler of the present invention uses the above rubber composition as a treat rubber.
- the rubber crawler has a structure in which, for example, as shown in the cross-sectional view in the width direction of FIG. A part of the metal core 5 including the part 3 and the wing part 4 is embedded in a rubber member 7 formed by forming a lug 6 on the installation surface side.
- an inner rubber sheet (rubber member 7) is laid on the lower mold surface that divides the inner peripheral surface of the rubber crawler, the cored bar 5 is arranged here, the rubber sheet, and the treat rubber 1 are arranged in order, The steel cord 2 bundled in a row is arranged. Further, the treat rubber 1 and the outer surface rubber sheet (rubber member 7) are arranged in this order, and then the upper mold that defines the outer peripheral surface of the rubber crawler is closed and vulcanized.
- a rubber crawler is formed by leaving an unvulcanized part partially in order to form from an elongated strip shape to an endless shape later, and then vulcanizing again after overlapping the part. Get.
- the rubber composition for forming the rubber member 7 the same rubber composition as that of the treat rubber 1 may be adopted.
- the thickness of the treat rubber 1 is considered while taking into account the thickness formed by the rubber member 7. What is necessary is just to select and arrange thickness suitably.
- Mass spectrometry (EI, 70 eV): m / z; 251 (M + -CH 4 ), 167 (M + -C 6 H 14 N), 100 (M + -C 7 H 5 NS 2 ): IR (KBr, cm ⁇ 1 ): 3061, 2975, 2932, 2868, 1461, 1429, 1393, 1366, 1352, 1309, 1273, 1238, 1198, 1103, 1022, 1011, 936, 895, 756, 727.
- Mass spectrometry (EI, 70 eV) m / z; 252 (M + ), 237 (M + -CH 3 ), 223 (M + -C 2 H 6 ), 195 (M + -C 4 H 9 ), 167 ( M + -C 5 H 12 N), 86 (M + -C 7 H 4 NS 2 ).
- Examples 1 to 4 Comparative Examples 1 to 3
- a rubber component, a vulcanization accelerator, and other compounding agents are kneaded and mixed according to the formulation shown in Table 1 to prepare an unvulcanized rubber composition.
- the Mooney viscosity and Mooney scorch time were measured, and a tensile test and a moist heat-resistant adhesion test were performed according to the following methods and evaluated. The results are shown in Table 1.
- the unit of the numerical value in each component in the rubber composition is part by mass.
- Examples 1 to 4 containing a rubber component, a specific amount of a cobalt-containing compound, and the specific vulcanization accelerator are comparative examples 1 to 4 containing a conventional vulcanization accelerator. 3. While maintaining good workability as compared with 3, it was possible to suppress the decrease in fracture resistance by suppressing elongation at break, tensile strength at break and tensile stress at 100% elongation, and excellent It can be seen that both wet heat resistance and durability as a rubber crawler are combined. It is also clear that such wet heat-resistant adhesive properties are more prominent, especially over a long period of time. Moreover, according to Example 4, it turns out that the same effect is acquired even if it is a case where the said specific vulcanization accelerator and the conventional vulcanization accelerator are used together.
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Abstract
Description
すなわち、本発明のゴムクローラは、ゴム成分100質量部に対し、式(I)で表されるスルフェンアミド系加硫促進剤を0.1~10質量部、コバルト含有化合物をコバルト量として0.03~3質量部、および硫黄を0.3~10質量部の量で含有するゴム組成物をトリートゴムに用いたことを特徴とする。
さらに、前記式(I)中、R3~R6がすべて水素原子であってもよい。
また、前記ゴム成分は、天然ゴム、ポリブタジエンゴム、ポリイソプレンゴム、アクリロニトリル-ブタジエンゴムからなる群より選ばれる少なくとも一種を含むのが望ましい。
本発明のゴムクローラは、ゴム成分100質量部に対し、式(I)で表されるスルフェンアミド系加硫促進剤を0.1~10質量部、コバルト含有化合物をコバルト量として0.03~3質量部、および硫黄を0.3~10質量部の量で含有するゴム組成物をトリートゴムに用いたことを特徴とする。
Pow=Co/Cw
Co:1-オクタノール層中の被験物質濃度
Cw:水層中の被験物質濃度
log Pow値は、JIS Z7260-117(2006)に準拠し、高速液体クロマトグラフィーを使用してPowを測定することにより求めることができる。
すなわち、対応するアミンと次亜塩素酸ソーダの反応によりあらかじめ調製したN-クロロアミンとビス(ベンゾチアゾール-2-イル)ジスルフィドを、アミンおよび塩基存在下、適切な溶媒中で反応させる。塩基としてアミンを用いた場合は、中和を行い、遊離のアミンに戻した後、得られた反応混合物の性状に従って、ろ過、水洗、濃縮、再結晶など適切な後処理を行うと、目的とするスルフェンアミドが得られる。
例えば、N-エチル-N-t-ブチルベンゾチアゾール-2-スルフェンアミド(BEBS)では、N-t-ブチルエチルアミンに次亜塩素酸ナトリウム水溶液を0℃以下で滴下し、2時間攪拌後油層を分取した。ビス(ベンゾチアゾール-2-イル)ジスルフィド、N-t-ブチルエチルアミンおよび前述の油層を、メタノールに懸濁させ、還流下2時間攪拌した。冷却後、水酸化ナトリウムで中和し、ろ過、水洗、減圧濃縮した後、再結晶することで目的とするBEBS(白色固体)を得ることができる。
まず、ゴムクローラの内周面を区画する下モールド面に内面ゴムシート(ゴム部材7)を敷き、ここに芯金5を配置し、ゴムシート、トリートゴム1を順に配置して、その上に列状に束ねたスチールコード2を配置する。さらにトリートゴム1、外面ゴムシート(ゴム部材7)を順に配置した後、ゴムクローラの外周面を区画する上モールドを閉じて加硫成形する。通常、この加硫成形の際、後に長尺帯状から無端状に成形するために未加硫部位を一部に残存させ、かかる部位を中心に重ねた後に再度加硫成形することにより、ゴムクローラを得る。
なお、各スルフェンアミド系加硫促進剤のlog Pow値は、上述したように、JIS Z7260-117(2006)に準拠し、高速液体クロマトグラフィーを使用してPowを測定することにより求めた。
N-t-ブチルエチルアミン16.4g(0.162mol)に12%次亜塩素酸ナトリウム水溶液148gを0℃以下で滴下し、2時間攪拌後油層を分取した。ビス(ベンゾチアゾール-2-イル)ジスルフィド39.8g(0.120mol)、N-t-ブチルメチルアミン24.3g(0.240mmol)および前述の油層を、メタノール120mLに懸濁させ、還流下2時間攪拌した。冷却後、水酸化ナトリウム6.6g(0.166mol)で中和し、ろ過、水洗、減圧濃縮した後、再結晶することで目的とする加硫促進剤1を41.9g(収率66%)の白色固体(融点60~61℃、log Pow値4.9)として得た。
得られた加硫促進剤1のスペクトルデータを以下に示す。
13C-NMR(100MHz,CDCl3)δ=15.12、28.06、47.08、60.41、120.70、121.26、123.23、125.64、134.75、154.93、182.63.
質量分析(EI、70eV):m/z;251(M+-CH4)、167(M+-C6H14N)、100(M+-C7H5NS2):IR(KBr,cm-1):3061,2975,2932,2868,1461,1429,1393,1366,1352,1309,1273,1238,1198,1103,1022,1011,936,895,756,727.
N-t-ブチルエチルアミンの代わりにN-t-ブチルメチルアミン14.1g(0.162mol)を用いて製造例1と同様に行い、加硫促進剤2を46.8g(収率82%)の白色固体(融点56~58℃、log Pow値4.5)として得た。
得られた加硫促進剤2のスペクトルデータを以下に示す。
13C-NMR(100MHz,CDCl3)δ=27.3、41.9、59.2、120.9、121.4、123.3、125.7、135.0、155.5、180.8.
質量分析(EI,70eV)m/z;252(M+)、237(M+-CH3)、223(M+-C2H6)、195(M+-C4H9)、167(M+-C5H12N)、86(M+-C7H4NS2).
N-t-ブチルメチルアミンの代わりにN-n-プロピル-t-ブチルアミン18.7g(0.162mol)を用いて製造例1と同様に行い、加硫促進剤3を白色固体(融点50~52℃、log Pow値5.3)として得た。
13C-NMR(100MHz,CDCl3)δ=11.7,23.0,28.1,55.3,60.4,120.7,121.3,123.3,125.7,134.7,154.8,181.3.
N-t-ブチルメチルアミンの代わりにN-i-プロピル-t-ブチルアミン18.7g(0.162mol)を用いて製造例1と同様に行い、加硫促進剤4を白色固体(融点68~70℃)として得た。
13C-NMR(100MHz,CDCl3)δ=22.3,23.9,29.1,50.6,61.4,120.6,121.2,123.2,125.6,134.5,154.5,183.3.
2200mLのバンバリーミキサーを使用して、ゴム成分、加硫促進剤、及びその他の配合剤を表1に示す配合処方で混練り混合して、未加硫のゴム組成物を調製し、以下の方法で、ムーニー粘度、ムーニースコーチタイムを測定し、引張り試験、および耐湿熱接着性試験を以下に示す方法にしたがって行い、評価した。結果を表1に示す。
JIS K 6300-1:2001に準拠して行った。
なお、評価は、比較例1の値を100として指数表示した。ムーニー粘度は、値が小さいほど混練時の作業性が良好であることを示し、ムーニースコーチタイムは、値が大きいほど混練後の作業性が良好であることを示す。
得られたゴム組成物からなるJISダンベル状3号形サンプルを作製し、JIS K 6251:2004に準拠して25℃にて引っ張り試験を行い、破断時引っ張り強さ(Tb)、破断時伸び(Eb)、100%伸長時の引張応力(M100)を測定し、それぞれ比較例1のゴム組成物の各値を100として指数表示した。指数値が大きいほど、耐破壊性に優れることを示す。
得られたゴム組成物からなるシート(厚さ15mm)を作製し、一対のシート間にスチールコード(直径7mm)を挟み込んで、170℃、40分の条件で加圧加硫を行い、試験片を作製した。
クローラ実走行による劣化促進試験(一般市場の劣化速度の20~30倍)にて、スチールコードオーバーラップ部分からのスチールコードとゴムとの接着剥離開始時間を測定した。なお、2.5~5tサイズの機体を使用し、ゴムクローラの幅を300~600mmとした。数値は比較例1を100として指数表示した。数値が大きいほど、ゴムクローラとしての耐久性に優れることを示す。
※2:ANTIGENE6C、住友化学(株)製
※3:大日本インキ化学工業(株)製バーサチック酸コバルト、コバルト含量:14質量%
※4:銀嶺SR、東邦亜鉛(株)製
※5:サフファックス5、鶴見化学工業(株)製
※6:N-シクロヘキシル-2-ベンゾチアジルスルフェンアミド(ノクセラーCZ、大内新興化学工業(株)製)
※7:N-t-ブチルベンゾチアゾール-2-スルフェンアミド(ノクセラーNS、大内新興化学工業(株)製)
2:スチールコード
3:外れ防止突起部
4:翼部
5:芯金
6:ラグ
7:ゴム部材
Claims (5)
- 前記式(I)中、R1がtert-ブチル基であり、R2が炭素数1~6の直鎖アルキル基であり、かつnが0である請求項1に記載のゴムクローラ。
- 前記式(I)中、R1がtert-ブチル基であり、R2が炭素数1~4の直鎖アルキル基であり、かつnが0である請求項1または2に記載のゴムクローラ。
- 前記式(I)中、R3~R6がすべて水素原子である請求項1~3のいずれかに記載のゴムクローラ。
- 前記ゴム成分が、天然ゴム、ポリブタジエンゴム、ポリイソプレンゴム、アクリロニトリル-ブタジエンゴムからなる群より選ばれる少なくとも一種を含む請求項1~4のいずれかに記載のゴムクローラ。
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CN201080028110.9A CN102803371B (zh) | 2009-06-26 | 2010-06-25 | 橡胶履带 |
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JP5524522B2 (ja) * | 2008-08-19 | 2014-06-18 | 株式会社ブリヂストン | ゴム組成物 |
JP6063768B2 (ja) * | 2013-02-21 | 2017-01-18 | 住友ゴム工業株式会社 | スチールコード及びそれを用いた弾性クローラ |
US10660588B2 (en) * | 2013-05-24 | 2020-05-26 | Imatrex Inc. | Tumor tracing device with multiple scan tubes |
CN109789903A (zh) * | 2016-09-30 | 2019-05-21 | 株式会社普利司通 | 橡胶履带 |
CN107163317A (zh) * | 2017-06-12 | 2017-09-15 | 合肥欧仕嘉机电设备有限公司 | 一种挖掘机用橡胶履带及其制备方法 |
CN107312209A (zh) * | 2017-08-14 | 2017-11-03 | 浙江久运汽车零部件有限公司 | 一种镀黄铜钢丝帘线橡胶履带 |
CN107698819A (zh) * | 2017-09-20 | 2018-02-16 | 镇江市胜得机械制造有限责任公司 | 一种用于橡胶履带的橡胶外包层 |
CN107629335A (zh) * | 2017-09-20 | 2018-01-26 | 镇江市胜得机械制造有限责任公司 | 一种低成本的履带 |
CN107540960A (zh) * | 2017-09-20 | 2018-01-05 | 镇江市胜得机械制造有限责任公司 | 一种新型橡胶履带 |
CN109721860A (zh) * | 2018-12-20 | 2019-05-07 | 徐工集团工程机械有限公司 | 一种耐老化橡胶履带 |
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US8530549B2 (en) | 2013-09-10 |
EP2447319B1 (en) | 2017-03-08 |
CN102803371A (zh) | 2012-11-28 |
EP2447319A4 (en) | 2015-07-29 |
JP2011006590A (ja) | 2011-01-13 |
EP2447319A1 (en) | 2012-05-02 |
US20120108738A1 (en) | 2012-05-03 |
CN102803371B (zh) | 2014-04-23 |
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