WO2011013513A1 - ゴム用充填材およびゴム組成物 - Google Patents
ゴム用充填材およびゴム組成物 Download PDFInfo
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- WO2011013513A1 WO2011013513A1 PCT/JP2010/061905 JP2010061905W WO2011013513A1 WO 2011013513 A1 WO2011013513 A1 WO 2011013513A1 JP 2010061905 W JP2010061905 W JP 2010061905W WO 2011013513 A1 WO2011013513 A1 WO 2011013513A1
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- rubber
- silica
- filler
- hydroxy acid
- coupling agent
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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
-
- 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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- 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
-
- 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
-
- 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
- C08K5/04—Oxygen-containing compounds
- C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
-
- 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
- C08K5/04—Oxygen-containing compounds
- C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
- C08K5/098—Metal salts of carboxylic acids
-
- 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
- C08L63/00—Compositions of epoxy resins; Compositions of derivatives of epoxy resins
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
- C08L67/04—Polyesters derived from hydroxycarboxylic acids, e.g. lactones
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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
Definitions
- the present invention relates to a rubber filler and a rubber composition obtained by blending hydroxy acid and / or a salt of hydroxy acid.
- silica-containing tires with excellent fuel economy and braking performance are rapidly spreading.
- silica when silica is blended, the viscosity of the rubber composition is greatly increased. Therefore, the increase in viscosity is mitigated by adding a silane coupling agent.
- Silane coupling agents are known to reduce the interaction between silica by reacting with silanols on the silica surface, and to reduce the loss tangent and dynamic elastic modulus of rubber.
- the reaction rate of silica and the silane coupling agent is very slow, and in order to sufficiently react them, a kneading step at a high temperature or a plurality of kneading steps are required.
- the kneading process at a high temperature is not preferable because rubber gelation occurs and processing becomes impossible.
- the process is performed in a plurality of kneading processes, the problem of rubber gelation does not occur, but the process becomes complicated.
- Patent Document 3 an attempt is made to directly pre-treat a silane coupling agent and wet silica in order to obtain a rubber composition having excellent crosslinking characteristics. Although this method has achieved a certain result, there are some problems from the viewpoint of economy and handling, such as using an alkoxy titanium highly reactive to water as a catalyst to be used.
- the present invention provides a filler composition that imparts excellent dynamic characteristics to rubber, a filler obtained by reacting the filler composition, a rubber composition containing the filler, and a crosslinked product thereof
- Another object of the present invention is to provide a silica-containing rubber composition capable of promoting the reaction between the silica-based filler and the coupling agent and a crosslinked product thereof.
- the present inventors have made a so-called hydroxy group having at least one or more hydroxyl groups and carboxyl groups in one molecule in the reaction between the silica-based filler and the silane coupling agent.
- acid and / or hydroxy acid salts particularly accelerate the reaction, and silica-based fillers, silane coupling agents, filler compositions containing hydroxy acids and / or hydroxy acid salts, and reacting filler compositions And a rubber composition containing the filler, and a crosslinked product thereof, or a composition containing a diene rubber, a silica filler, a silane coupling agent, a hydroxy acid and / or a hydroxy acid salt, and It discovered that the said subject could be solved with the crosslinked material.
- the rubber filler composition of the present invention comprises 2 to 25 parts by weight of a silane coupling agent and 0.1 to 10 parts by weight of a hydroxy acid and / or a hydroxy acid salt with respect to 100 parts by weight of a silica-based filler. It is characterized by containing a part.
- the hydroxy acid and / or the hydroxy acid salt is an aliphatic hydroxy acid having 2 to 18 carbon atoms and / or a salt of an aliphatic hydroxy acid, an aromatic having 7 to 18 carbon atoms.
- a salt of a hydroxy acid and / or an aromatic hydroxy acid is preferred.
- a hydroxy acid in which a carboxyl group and a hydroxyl group are bonded to the same or adjacent carbon is particularly preferable.
- the silane coupling agent is preferably a polysulfide silane coupling agent represented by the following formula [I].
- R 1 is a monovalent hydrocarbon group having 1 to 18 carbon atoms
- R 2 is a divalent hydrocarbon group having 1 to 9 carbon atoms
- x is 2 to 6
- Y is 0, 1, or 2
- the rubber filler composition of the present invention preferably contains a basic substance in an amount of 0.5 to 2.0 mol equivalent to the carboxyl group in the hydroxy acid.
- the silica filler is preferably wet silica having a BET specific surface area of 20 to 250 m 2 / g, and the apparent particle diameter of the wet silica is preferably 100 ⁇ m or less.
- the water content of the silica-based filler is preferably 4% by weight or less, and the silica-based filler may be heat-treated in advance.
- the rubber filler composition of the present invention is preferably obtained by reacting the silica filler of the rubber filler composition with a coupling agent.
- the rubber composition of the present invention preferably contains 5 to 120 parts by weight of the filler based on 100 parts by weight of the diene rubber.
- the silica-containing rubber composition of the present invention comprises 10 to 120 parts by weight of a silica-based filler, 0.5 to 20 parts by weight of a silane coupling agent, hydroxy acid and / or hydroxy based on 100 parts by weight of a diene rubber. It contains 0.1 to 10 parts by weight of an acid salt.
- the hydroxy acid and / or the salt of the hydroxy acid is an aliphatic hydroxy acid having 2 to 18 carbon atoms and / or a salt of an aliphatic hydroxy acid, an aromatic hydroxy having 7 to 18 carbon atoms. Acid and / or aromatic hydroxy acid salts are preferred.
- the silane coupling agent is preferably a polysulfide silane coupling agent represented by the following formula [I].
- R 1 is a monovalent hydrocarbon group having 1 to 18 carbon atoms
- R 2 is a divalent hydrocarbon group having 1 to 9 carbon atoms
- x is 2 to 6
- Y is 0, 1, or 2
- the rubber composition for crosslinking according to the present invention preferably contains the rubber composition and a crosslinking agent.
- the crosslinked product of the present invention is preferably formed by crosslinking the crosslinking rubber composition.
- the tire of the present invention is preferably made using the above-mentioned crosslinked product.
- the vibration-proof rubber of the present invention is formed using the cross-linked product.
- a composition containing a silica-based filler, a silane coupling agent and a hydroxy acid and / or a salt of a hydroxy acid reacts efficiently between the silica-based filler and the coupling agent, and the surface of the silica-based filler is treated with a coupling agent.
- the processing time can be shortened, and a rubber filler can be easily obtained.
- composition containing a diene rubber, a silica filler, a silane coupling agent, and a hydroxy acid and / or a salt of a hydroxy acid is kneaded so that the silica filler and the silane cup in the diene rubber mixture are kneaded.
- the ring agent reacts efficiently, and a sufficient coupling effect can be obtained by only one kneading step.
- the crosslinked product obtained in the present invention exhibits dynamic characteristics, that is, low loss tangent (tan ⁇ ).
- the rubber filler composition of the present invention refers to a composition in which a silica filler and a silane coupling agent are unreacted, and at least a silica filler, a silane coupling agent, a hydroxy acid, and / or Or a salt of a hydroxy acid is contained.
- silica-based filler used in the present invention includes clay, mica, dry silica, etc., but wet silica having a BET specific surface area of 20 to 250 m 2 / g is preferable, and a BET specific surface area of 50 to 200 m. 2 / g wet silica is more preferred.
- a specific surface area in the range of 20 m 2 / g to 250 m 2 / g is preferable because sufficient reinforcement for rubber can be obtained and the reactivity with the silane coupling agent is good.
- silica used in the present invention examples include commercially available silica such as Tosoh Silica, Nipsil VN-3, AQ, ER, E743, Tokuyama Toksil 255, UR, GU, 233, Degussa Ultrazil VN3, VN2. Is used.
- the apparent particle diameter of the silica-based filler is an average particle diameter, and a sieve or a particle counter (EL • ZONE280PC, manufactured by Particle Data Co., Ltd.) is used for measurement. In the case of a small particle having an average particle size of about 10 ⁇ m, a particle counter can be used, and in the case of a large particle having a mean particle size of about 100 ⁇ m, a sieve is preferably used.
- the apparent particle diameter of the silica-based filler is preferably 100 ⁇ m or less, and more preferably 80 ⁇ m or less. An apparent particle diameter of 100 ⁇ m or less is preferable because silanol groups on the surface of the silica filler can be sufficiently treated without agglomeration of the silica fillers.
- the water content (water content: wt%) of the silica-based filler is not particularly limited as long as the effect of promoting the reaction between silica and the silane coupling agent, which is the effect of the present invention, is not impaired.
- the silica and the coupling agent which are one of the significances of the present invention (first rubber filler composition)
- the desired physical properties are exhibited without heating during kneading.
- the water content evaporates during the vulcanization of the rubber composition containing the rubber filler, which will be described later. Air bubbles).
- the water content is preferably 4% by weight or less, more preferably 2% by weight or less.
- the water content (water content: wt%) of the silica-based filler can be measured from the weight loss before and after heating.
- a commercially available moisture meter eg, model MA45 electronic moisture meter manufactured by Sartorius Co., Ltd.
- the method A described in JIS-K 6218-1: 2005 may be applied mutatis mutandis.
- Silane coupling agent used in the present invention is not particularly limited, but vinyl silanes, amino silanes, epoxy silanes, methacryloxy silanes are exemplified, and (poly) sulfide silanes and mercapto silanes are particularly exemplified. Is preferred.
- a polysulfide-based silane coupling agent represented by the general formula [I] is more preferable, and bis (3-triethoxysilylpropyl) disulfide (abbreviation TESPD), bis (3-triethoxysilylpropyl) tetrasulfide (abbreviation TESPT). Is particularly preferred.
- TESPD bis (3-triethoxysilylpropyl) disulfide
- TESPT bis (3-triethoxysilylpropyl) tetrasulfide
- the compounding amount of the silane coupling agent is 2 to 25 parts by weight, preferably 5 to 20 parts by weight, based on 100 parts by weight of the silica filler.
- the range of 2 to 25 parts by weight is preferable because the effect of the silane coupling agent can be sufficiently obtained without deteriorating characteristics such as compression set.
- the hydroxy acid and / or hydroxy acid salt used in the present invention is particularly limited as long as it promotes the reaction between the silica filler and the silane coupling agent.
- aliphatic hydroxy acids having 2 to 12 carbon atoms and / or salts of aliphatic hydroxy acids, aromatic hydroxy acids having 7 to 12 carbon atoms and / or salts of aromatic hydroxy acids.
- a hydroxy acid and / or a salt thereof in which a carboxyl group and a hydroxyl group are bonded to the same or adjacent carbon are particularly preferable.
- saturated aliphatic hydroxy acids or unsaturated aliphatic hydroxy acids such as lactic acid, citric acid, isocitric acid, malic acid, tartaric acid, ricinoleic acid, hydroxystearic acid, salicylic acid, mandelic acid, creosote acid, coumaric acid
- Aromatic hydroxy acids such as, but not limited to. These salts may also be used. Specifically, salts of saturated aliphatic hydroxy acids or unsaturated aliphatic hydroxy acids such as sodium lactate, zinc lactate, calcium lactate, sodium citrate, anhydrous citric acid, and potassium tartrate. And salts of aromatic hydroxy acids such as sodium salicylate, but are not limited thereto.
- the hydroxy acid and / or hydroxy acid salt used in the present invention is preferably lactic acid, salicylic acid and / or salts thereof, and more preferably racemic lactic acid and / or lactate from the viewpoint of physical properties and economy.
- the blending amount of the hydroxy acid and / or the salt of the hydroxy acid is 0.1 to 10 parts by weight, preferably 0.1 to 5 parts by weight with respect to 100 parts by weight of the silica-based filler.
- the range of 0.1 to 10 parts by weight is preferable because the effect of promoting the reaction between the silica-based filler and the silane coupling agent can be obtained.
- the pH of the filler that is the raw material when it is not preferable that the pH of the compounding system (raw material) is on the acidic side, the pH of the filler that is the raw material is set.
- a basic component may be added to neutralize the hydroxy acid in the filler.
- the base component include sodium hydroxide, potassium hydroxide, calcium hydroxide, calcium carbonate, zinc oxide (zinc white), but are not limited thereto.
- the compounding amount of the basic component is preferably in the range of 0.5 to 2.0 molar equivalents relative to the carboxyl group in the hydroxy acid, and preferably 0.8 to 1.2 molar equivalents. More preferred.
- Rubber filler comprises the above-mentioned silica-based filler, silane coupling agent, hydroxy acid and / or hydroxy acid salt, and optionally a rubber filler composition containing an alkaline component. It can be obtained by reacting a silica-based filler and a silane coupling agent.
- heat treatment may be applied in order to further promote the reaction between the silica and the coupling agent, and the heating method, time, temperature, etc. are particularly limited. There is no. Specifically, examples include heating and stirring using a nauter mixer, a ribbon blender, a Henschel mixer, and the like, and then heating the composition in a heating oven or the like.
- the heating and stirring temperature and time are generally 40 to 200 ° C. and 1 minute to 24 hours.
- the procedure for adding a coupling agent and various additives to the silica filler is not asked, but hydroxy acid and / or hydroxy acid salt and silane coupling are added to the silica filler. It is preferable to go through a step of independently adding an agent and, if necessary, a basic substance. More preferably, a step of adding a basic substance after independently adding a hydroxy acid and / or a salt of a hydroxy acid and a silane coupling agent to the silica filler is more preferable.
- the hydroxy acid and / or hydroxy acid salt when the hydroxy acid and / or hydroxy acid salt is solid, it is preferably added after being dissolved in a solvent in order to improve dispersibility.
- a solvent include alcohols such as ethanol, acetone, toluene, and water, but are not limited thereto.
- Rubber composition containing rubber filler A rubber composition containing a rubber filler and a rubber component will be described below.
- Examples of the rubber component used in the present invention include diene rubbers such as natural rubber, butadiene rubber, styrene butadiene rubber, ethylene propylene terpolymer, butyl rubber, acrylonitrile butadiene rubber, and chloroprene rubber. These diene rubbers are one or two. It may be used in a blend of more than seeds.
- the blending amount of the rubber filler is preferably 5 to 120 parts by weight, more preferably 10 to 110 parts by weight, and particularly preferably 20 to 100 parts by weight with respect to 100 parts by weight of the diene rubber. Part is particularly preferred.
- the amount is less than 5 parts by weight, sufficient reinforcement is not exhibited, and when it exceeds 120 parts by weight, the viscosity becomes high and the workability deteriorates.
- crosslinking agent used in the rubber composition containing the rubber filler of the present invention examples include vulcanizing agents such as sulfur, peroxide, thiurams, and oximes, but are not limited thereto. Absent.
- the blending amount of the crosslinking agent is preferably 0.1 to 10 parts by weight, more preferably 0.1 to 5 parts by weight, with respect to 100 parts by weight of the diene rubber.
- the rubber composition containing the rubber filler of the present invention can use other compounding agents usually used in the rubber industry, without departing from the spirit of the present invention.
- vulcanization accelerators, processing aids, anti-aging agents, fillers, reinforcing agents, softeners, plasticizers and the like can be used.
- the silica-containing rubber composition will be described in detail as the second rubber composition.
- the silica-blended rubber composition is different from the rubber composition containing the rubber filler described above in that the silica and the silane coupling agent remain unreacted and blended with the diene rubber.
- silica-containing rubber composition of the present invention contains at least a diene rubber, a silica-based filler, a silane coupling agent and a hydroxy acid and / or a hydroxy acid salt.
- Diene rubber used in the silica-containing rubber composition of the present invention includes natural rubber, butadiene rubber, styrene butadiene rubber, ethylene propylene terpolymer, butyl rubber, acrylonitrile butadiene rubber, chloroprene rubber, and the like. You may use by 1 type, or 2 or more types of blends.
- silica-based filler used in the silica-containing rubber composition of the present invention is preferably wet silica having a BET specific surface area of 20 to 250 m 2 / g, and wet silica having a BET specific surface area of 50 to 200 m 2 / g. More preferred.
- a specific surface area in the range of 20 m 2 / g to 250 m 2 / g is preferable because sufficient reinforcement for rubber can be obtained and the reactivity with the silane coupling agent is good.
- silica examples include commercially available silica such as Tosoh Silica Co., Ltd., Nipsil VN-3, AQ, ER, E743, Tokuyama Tokusil 255, UR, GU, 233, Degussa Ultrasil VN3, VN2. .
- the amount of the silica-based filler is preferably 10 to 120 parts by weight, more preferably 10 to 110 parts by weight, particularly 20 to 100 parts by weight, based on 100 parts by weight of the diene rubber. preferable. If the amount is less than 10 parts by weight, sufficient reinforcing properties are not exhibited. If the amount exceeds 120 parts by weight, the viscosity becomes high and the workability deteriorates.
- the minimum value of the blending amount is different from that of the first rubber filler composition because normal silica is inferior in reinforcement compared to the first rubber filler composition. It is. Specifically, normal silica has poor compatibility with rubber (bad compatibility with rubber) and poor reinforcement due to silanol present on the surface. In addition, since silica (surface-treated silica) obtained by reacting a silane coupling agent and silica has reduced silanol, it is presumed that as a result of increased compatibility with rubber, reinforcing properties are enhanced. .
- silane coupling agent used in the silica-containing rubber composition of the present invention is not particularly limited, but vinyl silanes, amino silanes, epoxy silanes, and methacryloxy silanes are exemplified, and in particular, (poly) sulfide type Silanes and mercaptosilanes are preferred.
- a polysulfide-based silane coupling agent represented by the general formula [I] is particularly preferable, and bis (3-triethoxysilylpropyl) disulfide (abbreviation TESPD), bis (3-triethoxysilylpropyl) tetrasulfide (abbreviation TESPT).
- R 1 is a monovalent hydrocarbon group having 1 to 18 carbon atoms
- R 2 is a divalent hydrocarbon group having 1 to 9 carbon atoms
- x is 2 to 6
- Y is 0, 1, or 2
- the compounding amount of the silane coupling agent is 0.5 to 20 parts by weight and preferably 1 to 12 parts by weight with respect to 100 parts by weight of the diene rubber.
- the range of 0.5 to 20 parts by weight is preferable because the effect of the silane coupling agent can be obtained sufficiently without deterioration of properties such as compression set.
- the hydroxy acid and / or hydroxy acid salt used in the silica-containing rubber composition of the present invention should promote the reaction between the silica-based filler and the silane coupling agent.
- it can be used without any particular limitation. More specifically, it is a compound having at least one carboxyl group and hydroxyl group in each molecule and / or a salt thereof (such as sodium salt, calcium salt, zinc salt, etc.), and its main chain is fatty May be a tribe or an aromatic.
- aliphatic hydroxy acids having 2 to 12 carbon atoms and / or salts of aliphatic hydroxy acids, aromatic hydroxy acids having 7 to 12 carbon atoms and / or salts of aromatic hydroxy acids.
- a hydroxy acid in which a carboxyl group and a hydroxyl group are bonded to the same or adjacent carbon is particularly preferable.
- saturated aliphatic hydroxy acids or unsaturated aliphatic hydroxy acids such as lactic acid, citric acid, isocitric acid, malic acid, tartaric acid, ricinoleic acid, hydroxystearic acid, salicylic acid, mandelic acid, creosote acid, coumaric acid
- Aromatic hydroxy acids such as, but not limited to. These salts may also be used. Specifically, salts of saturated aliphatic hydroxy acids or unsaturated aliphatic hydroxy acids such as sodium lactate, zinc lactate, calcium lactate, sodium citrate, anhydrous citric acid, and potassium tartrate. And salts of aromatic hydroxy acids such as sodium salicylate, but are not limited thereto.
- the hydroxy acid and / or hydroxy acid salt used in the present invention is preferably lactic acid, salicylic acid and / or a salt thereof, more preferably a racemic lactic acid and / or a lactate from the viewpoint of physical properties and economy. .
- the blending amount of the hydroxy acid and / or the salt of the hydroxy acid is 0.1 to 10 parts by weight, preferably 0.1 to 5 parts by weight with respect to 100 parts by weight of the diene rubber.
- the range of 0.1 to 10 parts by weight is preferable because the effect of promoting the reaction between the silica-based filler and the silane coupling agent can be obtained.
- the filler of the raw material when the crosslinking rate at the time of crosslinking the silica-blended rubber composition changes with pH, or when it is not preferable that the pH of the blended system (raw material) is on the acidic side, the filler of the raw material In cases where it is not desired to change the pH, a basic component may be added to neutralize the hydroxy acid in the filler.
- the base component include sodium hydroxide, potassium hydroxide, calcium hydroxide, calcium carbonate, zinc oxide (zinc white), but are not limited thereto.
- the compounding amount of the basic component is preferably in the range of 0.5 to 2.0 molar equivalents relative to the carboxyl group in the hydroxy acid, and preferably 0.8 to 1.2 molar equivalents. More preferred.
- crosslinking agent used in the silica-containing rubber composition of the present invention examples include vulcanizing agents such as sulfur, peroxide, thiurams, and oximes, but are not limited thereto.
- the blending amount of the crosslinking agent is preferably 0.1 to 10 parts by weight, more preferably 0.1 to 5 parts by weight, with respect to 100 parts by weight of the diene rubber.
- a compounding agent usually used in the rubber industry can be used for the silica compounded rubber composition of the present invention, in addition to the above, without departing from the spirit of the present invention.
- vulcanization accelerators, processing aids, anti-aging agents, fillers, reinforcing agents, softeners, plasticizers and the like can be used.
- the present invention of a rubber composition containing a rubber filler is preferably kneaded at 10 ⁇ 250 ° C., kneaded at 30 ⁇ 180 ° C. It is more preferable.
- the kneading time is not particularly limited, but is, for example, 1 minute to 1 hour.
- kneading is preferably performed at 80 to 200 ° C., more preferably 100 to 180 ° C.
- the kneading time is not particularly limited, but is, for example, 1 minute to 1 hour.
- the production of the crosslinking rubber composition of the present invention is carried out by adding a crosslinking agent to the rubber composition containing the above-mentioned rubber filler and silica compounded rubber composition and kneading at 100 ° C. or lower. It is preferable.
- various mixing machines such as rolls, pressure kneaders, intermixers, and banbury mixers that are usually used in the rubber industry can be used. It is suitable for manufacturing dynamically used rubber parts such as shoe soles.
- a crosslinked product obtained by crosslinking the crosslinking rubber composition of the present invention is formed by molding the above-described crosslinking rubber composition into an intended shape by an extruder, a calender roll, or a press, preferably 130. It can be obtained by heating at ⁇ 230 ° C. for 1 minute to 3 hours. In addition, a mold may be used for crosslinking.
- the silica used in Tables 1 to 3 has a BET specific surface area of 109 m 2 / g and an apparent average particle diameter of 10 ⁇ m
- the silica used in Table 4 has a specific surface area of 214 m 2 / g and an apparent average particle diameter of 25 ⁇ m. is there.
- the BET specific surface area is a value described in a test result table of purchased silica.
- the apparent average particle size was measured using a particle counter (EL-ZONE280PC, manufactured by Particle Data).
- the amount of added TESPT is 15% by weight with respect to silica in Tables 1 to 3, and as described in the table in Table 4.
- Fatty acids are used when the number of carbon atoms is small (in the case of aliphatic carboxylic acids having 1 to 8 carbon atoms such as acetic acid, butyric acid, and hexanoic acid, especially aliphatic carboxylic acids having 1 to 6 carbon atoms). Is not practical due to bad odor or specific odor, but in the case of a hydroxy acid, lactic acid having a small number of carbon atoms does not have a specific odor and is preferable in this respect.
- inorganic acids such as hydrochloric acid and sulfuric acid are not preferable because silica and the coupling agent do not react with each other depending on the concentration, and the coupling agents may react and gel. Further, when the coupling agent and silica are not reacted, the Payne effect due to the silanol interaction on the silica surface is not decreased, and tan ⁇ is increased, that is, the fuel consumption characteristics are deteriorated.
- a test piece of width 4 mm ⁇ length 40 mm ⁇ thickness 2 mm is punched out from a vulcanized sheet of a viscoelastic property test , and dynamic under an excitation condition of an initial load of 1000 mN, a tensile strain of 10 ⁇ m, and 10 Hz in a DMS6100 manufactured by Seiko Instruments Inc. Characteristics (loss tangent: tan ⁇ ) were measured. The measurement temperature range was ⁇ 20 ° C. to 80 ° C., and the temperature was increased at a rate of 2 ° C./min. The value (tan ⁇ ) at 60 ° C. of the loss tangent obtained by the measurement method is an index of tire rolling resistance, and the smaller the value, the more preferable.
- Table 6 shows the test results of Examples and Comparative Examples obtained from the above production method.
- Table 7 shows the results of relative evaluation of Examples 15 to 19 with Comparative Example 8 as a reference (reference value: 100).
- Tan ⁇ at 60 ° C. indicates an index of tire rolling resistance, and the smaller this value, the better the fuel consumption as a tire. From Comparative Example 8, Examples 15 to 19 showed smaller values, and it was confirmed that the reaction between silica and the coupling agent was further promoted by the hydroxy acid.
- composition 2 The composition shown in the composition (I) of Table 8 was kneaded with a 1.7 L Banbury mixer on a 650 g rubber basis at 150 ° C. for 6 minutes, and cooled with a 12-inch roll after dumping. Next, the crosslinker component shown in the formulation (II) of Table 8 was added and kneaded for 10 minutes to obtain a sheet having a thickness of about 2 mm. It was hot press crosslinked at 160 ° C. for 20 minutes to obtain a test sample.
- Table 9 shows the test results of Examples and Comparative Examples obtained from the above production method.
- Table 10 shows the results of relative evaluation of Comparative Example 10 and Examples 20 to 27 using Comparative Example 9 as a reference (reference value: 100).
- a rubber filler or a rubber composition containing a hydroxy acid can sufficiently exhibit the effect of a coupling agent, thereby simplifying the conventional kneading method and exhibiting excellent dynamic properties. . Therefore, it is suitable for the production of dynamically used rubber parts such as tire treads, anti-vibration rubbers, and shoe soles.
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Abstract
Description
本発明のゴム用充填材組成物は、シリカ系充填材とシランカップリング剤が未反応の組成物を指し、少なくともシリカ系充填材、シランカップリング剤、ヒドロキシ酸及び/又はヒドロキシ酸の塩を含有する。
本発明で用いるシリカ系充填材としては、クレー、マイカ、乾式シリカなどが挙げられるが、BET比表面積が20~250m2/gの湿式シリカが好ましく、BET比表面積が50~200m2/gの湿式シリカがより好ましい。比表面積が20m2/g~250m2/gの範囲であれば、ゴムに対する十分な補強性が得られ、シランカップリング剤との反応性も良好であるので好ましい。本発明に使用されるシリカとしては、東ソーシリカ社製、ニプシルVN-3、AQ、ER、E743、トクヤマ社製トクシル255、UR、GU、233、デグサ社製ウルトラジルVN3、VN2など市販のシリカが用いられる。
本発明で用いられるシランカップリング剤とは特に限定はされないがビニルシラン類、アミノシラン類、エポキシシラン類、メタクリロキシシラン類が例示され、特に(ポリ)スルフィド系シラン類とメルカプトシラン類が好ましい。
本発明に使用されるヒドロキシ酸及び/又はヒドロキシ酸の塩は、シリカ充填材とシランカップリング剤との反応を促進するものであれば、特に限定されることなく使用できる。より詳細には、1分子内にカルボキシル基とヒドロキシル基をそれぞれ少なくとも1つ以上持つ化合物及び/又はその塩(ナトリウム塩、カルシウム塩、亜鉛塩などが例示される)であり、その主鎖は脂肪族でも芳香族でも良い。好ましくは炭素数2~18の脂肪族ヒドロキシ酸及び/又は脂肪族ヒドロキシ酸の塩、炭素数7~18の芳香族ヒドロキシ酸及び/又は芳香族ヒドロキシ酸の塩である。より好ましくは炭素数2~12の脂肪族ヒドロキシ酸及び/又は脂肪族ヒドロキシ酸の塩、炭素数7~12の芳香族ヒドロキシ酸及び/又は芳香族ヒドロキシ酸の塩である。またカルボキシル基とヒドロキシル基が同一又は隣り合った炭素に結合しているヒドロキシ酸及び/又はその塩が特に好ましい。
本発明のゴム用充填材は、上記のシリカ系充填材、シランカップリング剤、ヒドロキシ酸及び/又はヒドロキシ酸の塩、場合によってはアルカリ性成分を含むゴム用充填材組成物中のシリカ系充填材とシランカップリング剤を反応させて得ることができる。
本発明のゴム用充填材の製造方法としては、シリカとカップリング剤の反応をより促進するために加熱処理を施してもよく、加熱方法や時間、温度など特に制限はない。具体的には、ナウターミキサーやリボンブレンダー、ヘンシェルミキサーなどを用いて加熱攪拌し、その後、組成物を加熱オーブンなどで加熱する等を例示することができる。加熱撹拌温度及び時間は、一般的には40~200℃で、1分~24時間である。
ゴム用充填材とゴム成分を含有したゴム組成物について、以下に説明する。
本発明のシリカ配合ゴム組成物は、少なくともジエン系ゴム、シリカ系充填材、シランカップリング剤及びヒドロキシ酸及び/又はヒドロキシ酸の塩を含む。
本発明のシリカ配合ゴム組成物で用いるジエン系ゴムは天然ゴム、ブタジエンゴム、スチレンブタジエンゴム、エチレンプロピレンターポリマー、ブチルゴム、アクリロニトリルブタジエンゴム、クロロプレンゴムなどが挙げられ、これらジエン系ゴムは1種または2種以上のブレンドで使用しても良い。
本発明のシリカ配合ゴム組成物で用いるシリカ系充填材は、BET比表面積が20~250m2/gの湿式シリカが好ましく、BET比表面積が50~200m2/gの湿式シリカがより好ましい。比表面積が20m2/g~250m2/gの範囲であれば、ゴムに対する十分な補強性が得られ、シランカップリング剤との反応性も良好であるので好ましい。このようなシリカとしては、東ソーシリカ社製、ニプシルVN-3、AQ、ER、E743、トクヤマ社製トクシル255、UR、GU、233、デグサ社製ウルトラジルVN3、VN2など市販のシリカが用いられる。
本発明のシリカ配合ゴム組成物で用いられるシランカップリング剤とは特に限定はされないがビニルシラン類、アミノシラン類、エポキシシラン類、メタクリロキシシラン類が例示され、特に(ポリ)スルフィド系シラン類とメルカプトシラン類が好ましい。
本発明のシリカ配合ゴム組成物に使用されるヒドロキシ酸及び/又はヒドロキシ酸の塩は、シリカ系充填材とシランカップリング剤との反応を促進するものであれば、特に限定されることなく使用できる。より詳細には、1分子内にカルボキシル基とヒドロキシル基をそれぞれ少なくとも1つ以上持つ化合物及び/又はその塩(ナトリウム塩、カルシウム塩、亜鉛塩などが例示される)であり、その主鎖は脂肪族でも芳香族でも良い。好ましくは炭素数2~18の脂肪族ヒドロキシ酸及び/又は脂肪族ヒドロキシ酸の塩、炭素数7~18の芳香族ヒドロキシ酸及び/又は芳香族ヒドロキシ酸の塩である。より好ましくは炭素数2~12の脂肪族ヒドロキシ酸及び/又は脂肪族ヒドロキシ酸の塩、炭素数7~12の芳香族ヒドロキシ酸及び/又は芳香族ヒドロキシ酸の塩である。またカルボキシル基とヒドロキシル基が同一又は隣り合った炭素に結合しているヒドロキシ酸が特に好ましい。
本発明のゴム用充填材を含有するゴム組成物の製造方法としては、10~250℃で混練することが好ましく、30~180℃で混練することがより好ましい。混練時間は特に制限はないが、例えば1分~1時間である。
本発明のシリカ配合ゴム組成物の製造方法としては、80~200℃で混練することが好ましく、100~180℃で混練することがより好ましい。混練時間は特に制限はないが、例えば1分~1時間である。
本発明の架橋用ゴム組成物の製造は、前述のゴム用充填材を含有するゴム組成物、シリカ配合ゴム組成物に架橋剤を加え、100℃以下で混練することが好ましい。
本発明の架橋用ゴム組成物を架橋してなる架橋物は、上述の架橋用ゴム組成物を押出成形機、カレンダーロール、またはプレスにより意図する形状に成形し、好ましくは130~230℃で、1分~3時間加熱して得ることができる。また、架橋の際には金型を用いても良い。
130℃で24時間乾燥させ揮発分を0重量%としたシリカ100重量部に対し、表1~4に示される水分量と添加剤量になるように蒸留水および各種添加剤を混合し、2Lヘンシェルミキサー(株式会社カワタ製、スーパーミキサーピッコロ)を用い室温にて600rpmで15分攪拌した。その後、ビス(トリエトキシシリルプロピル)テトラスルフィド(TESPT)を添加、600rpmで45分攪拌して充填材とした。また当該充填材に表2に示される量の亜鉛華を中和剤として添加し、中和された充填材とした。
上記で作製した各種充填材のカップリング性の指標として、抽出量(溶剤抽出量:重量%)による評価を行った。なお、これら充填材は、作成後、アルミ蒸着された袋に入れて密封し、23℃の恒温槽内で保管し、1週間経過時点で評価を行った。各種充填材(10g)をメチルエチルケトン(50g)に入れて10分間激しく攪拌し、このスラリーを減圧濾過および残渣をメチルエチルケトンにてリンス(5ml×5回)を行い、得られた溶液をロータリーエバポレーターにて、50mmHgまで減圧し、70℃で20分間減圧濃縮する事によって、抽出量を測定した。抽出量が多ければ未反応のTESPTが残存している事を意味し、少なければ少ないほど好ましい。
表5(I)の配合に示される配合物を40~50℃の6インチロールにてゴム分200gベースで30分混練し、次いで表5の配合(II)に示されるに示される架橋剤成分を添加し10分間混練後、約2mmの厚みのシートを得た。それを160℃で20分間熱プレス架橋し、試験用サンプルを得た。尚、充填材は先述の充填材の処理性評価と同様に、作成後1週間経過時点のものを使用した。
*1 JSR社製 SL552
*2 JSR社製 BR01
*3 日本サンオイル社製 Sunthene415
*4 大内新興社製 ジフェニルグアニジン
*5 大内新興社製 N-シクロヘキシル-2-ベンジルスルフェンアミド
加硫シートから幅4mm×長さ40mm×厚み2mmの試験片を打ち抜き、セイコーインスツル株式会社製DMS6100にて、初期荷重1000mN、引張歪10μm、10Hzの加振条件下で動的特性(損失正接:tanδ)を測定した。なお測定温度範囲は-20℃~80℃とし、2℃/分の速度で昇温した。前記測定方法で求めた損失正接の60℃における値(tanδ)が、タイヤの転がり抵抗の指標であり、小さいほど好ましい。
表8の配合(I)に示される配合物を1.7Lバンバリーミキサーにてゴム分650gベースで、150℃で6分間混練し、ダンプ後12インチロールにて冷却した。次いで表8の配合(II)に示されるに示される架橋剤成分を添加し10分間混練後、約2mmの厚みのシートを得た。それを160℃で20分間熱プレス架橋し、試験用サンプルを得た。
*6 JSR社製 SL552
*7 JSR社製 BR01
*8 東ソーシリカ製 Nipsil AQ
*9 日本サンオイル社製 Sunthene415
*10 ダイソー社製 CABRUS-4
*11 大内新興社製 ジフェニルグアニジン
*12 大内新興社製 N-シクロヘキシル-2-ベンジルスルフェンアミド
Claims (15)
- シリカ系充填材100重量部に対し、シランカップリング剤を2~25重量部、ヒドロキシ酸及び/又はヒドロキシ酸の塩を0.1~10重量部を含有することを特徴とするゴム用充填材組成物。
- ヒドロキシ酸及び/又はヒドロキシ酸の塩が、炭素数2~18の脂肪族ヒドロキシ酸及び/又は脂肪族ヒドロキシ酸の塩、炭素数7~18の芳香族ヒドロキシ酸及び/又は芳香族ヒドロキシ酸の塩である請求項1に記載のゴム用充填材組成物。
- ヒドロキシ酸中のカルボキシル基に対して0.5~2.0モル等量の塩基性物質を含有することを特徴とする、請求項1~3いずれかに記載のゴム用充填材組成物。
- シリカ系充填材が、BET比表面積20~250m2/gの湿式シリカであることを特徴とする請求項1~4いずれかに記載のゴム用充填材組成物。
- 請求項1~5記載のゴム用充填材組成物のシリカ系充填材とカップリング剤とを反応して得られるゴム用充填材。
- 請求項6に記載の充填材をジエン系ゴム100重量部に対し5~120重量部を含むことを特徴とするゴム組成物。
- ジエン系ゴム100重量部に対して、シリカ系充填材を10~120重量部、シランカップリング剤を0.5~20重量部、ヒドロキシ酸及び/又はヒドロキシ酸の塩を0.1~10重量部を含有することを特徴とする、シリカ配合ゴム組成物。
- ヒドロキシ酸及び/又はヒドロキシ酸の塩が、炭素数2~18の脂肪族ヒドロキシ酸及び/又は脂肪族ヒドロキシ酸の塩、炭素数7~18の芳香族ヒドロキシ酸及び/又は芳香族ヒドロキシ酸の塩である請求項8に記載のシリカ配合ゴム組成物。
- シリカ系充填材がBET比表面積20~250m2/gの湿式シリカであることを特徴とする請求項8~10いずれかに記載のシリカ配合ゴム組成物。
- 請求項7~11に記載のゴム組成物と架橋剤を含む架橋用ゴム組成物。
- 請求項12記載の架橋用ゴム組成物を架橋してなる架橋物。
- 請求項13記載の架橋物を用いてなるタイヤ。
- 請求項13記載の架橋物を用いてなる防振ゴム。
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JP2013043912A (ja) * | 2011-08-23 | 2013-03-04 | Sumitomo Rubber Ind Ltd | 高減衰組成物およびその製造方法 |
JP2015086316A (ja) * | 2013-10-31 | 2015-05-07 | 住友ゴム工業株式会社 | ゴム組成物、それを用いたタイヤ部材およびタイヤ |
WO2016002653A1 (ja) * | 2014-07-04 | 2016-01-07 | 第一工業製薬株式会社 | 充填材用組成物、充填材および充填材の製造方法 |
JP2016017100A (ja) * | 2014-07-04 | 2016-02-01 | 第一工業製薬株式会社 | 充填材用組成物、充填材および充填材の製造方法 |
JP2017101174A (ja) * | 2015-12-03 | 2017-06-08 | 住友ゴム工業株式会社 | タイヤ用ゴム組成物の製造方法 |
JP7368936B2 (ja) | 2018-09-27 | 2023-10-25 | 株式会社バルカー | シール部材付き継手 |
Also Published As
Publication number | Publication date |
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TW201107388A (en) | 2011-03-01 |
KR101655501B1 (ko) | 2016-09-07 |
JP5716967B2 (ja) | 2015-05-13 |
EP2460848B1 (en) | 2018-09-05 |
EP2460848A1 (en) | 2012-06-06 |
JP2010155967A (ja) | 2010-07-15 |
ES2700780T3 (es) | 2019-02-19 |
EP2460848A4 (en) | 2015-02-25 |
KR20120052368A (ko) | 2012-05-23 |
TWI491659B (zh) | 2015-07-11 |
JPWO2011013513A1 (ja) | 2013-01-07 |
CN102471544A (zh) | 2012-05-23 |
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