WO2016208100A1 - ゴム組成物、積層体、及びコンベアベルト - Google Patents
ゴム組成物、積層体、及びコンベアベルト Download PDFInfo
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- WO2016208100A1 WO2016208100A1 PCT/JP2016/001197 JP2016001197W WO2016208100A1 WO 2016208100 A1 WO2016208100 A1 WO 2016208100A1 JP 2016001197 W JP2016001197 W JP 2016001197W WO 2016208100 A1 WO2016208100 A1 WO 2016208100A1
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- rubber
- rubber composition
- mass
- reinforcing material
- parts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G15/00—Conveyors having endless load-conveying surfaces, i.e. belts and like continuous members, to which tractive effort is transmitted by means other than endless driving elements of similar configuration
- B65G15/30—Belts or like endless load-carriers
- B65G15/32—Belts or like endless load-carriers made of rubber or plastics
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D29/00—Producing belts or bands
- B29D29/06—Conveyor belts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B25/00—Layered products comprising a layer of natural or synthetic rubber
- B32B25/04—Layered products comprising a layer of natural or synthetic rubber comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material
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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
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
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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
- 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
-
- 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
- C08L9/06—Copolymers with styrene
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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
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
Definitions
- the present invention relates to a rubber composition, a laminate, and a conveyor belt.
- Reinforcing materials such as organic fibers such as polyethylene terephthalate and nylon, and / or inorganic fibers such as steel cord, which have been dipped on the surface thereof, are used.
- the reinforcing material and the rubber member are often bonded and / or the reinforcing materials are bonded to each other via an adhesive made of a rubber composition.
- a conveyor belt is often used as a transportation means for goods in various industrial fields, and is required to have a high durability capable of withstanding friction and impact with a transported object.
- a plurality of layers of reinforcing material and a cover rubber as a rubber member are prepared, and these are laminated so that the cover rubber becomes the upper and lower outermost layers through an adhesive made of a rubber composition, and then vulcanized and bonded. It is manufactured by. Under such circumstances, in order to obtain a high reinforcing effect, there is a demand for a rubber composition capable of exhibiting high adhesiveness between the reinforcing materials and high adhesiveness between the rubber member and the reinforcing material.
- Patent Document 1 discloses that N, N′-m with respect to 100 parts by weight of rubber such as natural rubber or styrene butadiene rubber. -0.5 to 10 parts by weight of phenylene bismaleimide, 0.3 to 3 parts by weight of a divalent or higher carboxylic acid or anhydride thereof, and 0.3 to 10 parts by weight of a compound that generates formaldehyde by heating. It is disclosed that a rubber member that can be produced from the rubber composition is excellent in vulcanization adhesion performance with a reinforcing material.
- the joining between the reinforcing materials does not become sufficiently strong, and the conveyor belt cannot be provided with high durability, and there is room for improvement in such a rubber composition.
- the conventional rubber can be easily peeled to some extent during the work of peeling the layer composed of the rubber composition and the reinforcing material layer, including the endless processing described above.
- the composition is also required to have high peeling workability.
- an object of the present invention is to provide a rubber composition that is excellent in adhesion to a reinforcing material, particularly an environmentally deteriorated reinforcing material, and can provide high peeling workability with these materials.
- Another object of the present invention is to provide a laminate using the rubber composition described above, which can improve the durability of the rubber product, and a conveyor belt using the laminate described above, which has high durability. There is also to do.
- the present inventors have formulated a specific amount of a specific component into a rubber component containing a diene rubber, thereby providing a reinforcing material, in particular, an environmentally deteriorated reinforcing material. It has been found that a rubber composition can be obtained which is excellent in the adhesiveness and can provide high peeling workability with these.
- the rubber composition of the present invention is a rubber composition comprising a rubber component containing a diene rubber, wet silica, carbon black, and calcium carbonate,
- the compounding amount of the wet silica is 3 parts by mass or more with respect to 100 parts by mass of the diene rubber
- the blending amount of the calcium carbonate is 10 parts by mass or more and 120 parts by mass or less with respect to 100 parts by mass of the diene rubber.
- Such a rubber composition is excellent in adhesiveness to a reinforcing material, particularly an environmentally deteriorated reinforcing material, and can provide high peeling workability with these.
- the average primary particle diameter of the calcium carbonate is preferably 0.8 ⁇ m or more and 13 ⁇ m or less.
- the blending amount of the wet silica is preferably 4 parts by mass or more and 9 parts by mass or less with respect to 100 parts by mass of the diene rubber.
- the adhesion to the reinforcing material, particularly the reinforcing material deteriorated by exposure to the atmosphere can be sufficiently increased, and the unvulcanized rubber composition can be used.
- An increase in viscosity can be suppressed, and a decrease in productivity of rubber products using such a rubber composition can be suppressed.
- the rubber component preferably contains natural rubber and styrene-butadiene rubber. Thereby, it can be set as the rubber composition which adhesiveness with a reinforcing material improved more.
- the ratio of the blended amount of the natural rubber to the total blended amount of the natural rubber and the styrene-butadiene rubber is preferably 20% by mass or more and 60% by mass or less.
- the BET specific surface area by nitrogen adsorption of the wet silica is preferably 80 m 2 / g or more, more preferably more than 200 m 2 / g.
- the BET specific surface area by nitrogen adsorption of the wet silica is within the above range, the polarity of the rubber composition is increased, and the adhesion between the rubber composition and the reinforcing material can be further improved.
- the carbon black preferably has a BET specific surface area of 8 m 2 / g or more and 100 m 2 / g or less by nitrogen adsorption. While the BET specific surface area by nitrogen adsorption of the carbon black is within the above range, the peel strength between the rubber composition and the reinforcing material, particularly the environmentally deteriorated reinforcing material, can be improved while peeling. Productivity such as anti-scattering property and rolling property at the time of production can be made sufficiently while sufficiently suppressing deterioration of workability.
- the rubber composition of the present invention is used for interposing between the rubber member and the reinforcing material or between the reinforcing materials and bonding them. Thereby, the rubber member and the reinforcing material and / or the reinforcing materials can be firmly bonded.
- the “rubber member” refers to any member that is used in the manufacture of rubber products and contains at least a rubber component.
- the laminate of the present invention is characterized in that a layer comprising the rubber composition of the present invention and a reinforcing material layer are laminated and bonded.
- the layer made of the rubber composition and the reinforcing material layer are firmly bonded, and the durability of the rubber product can be improved.
- the conveyor belt of this invention is characterized by including the laminated body of this invention.
- Such a conveyor belt has high durability because the layer made of the rubber composition and the reinforcing material layer are firmly bonded.
- the present invention it is possible to provide a rubber composition that is excellent in adhesion to a reinforcing material, particularly an environmentally deteriorated reinforcing material, and that can provide high peeling workability with these.
- a laminate using the rubber composition described above which can improve the durability of the rubber product, and a conveyor belt using the laminate described above, which has high durability. can do.
- the rubber composition of the present invention comprises at least a rubber component containing a diene rubber, wet silica, carbon black, calcium carbonate, and, if necessary, other components.
- the rubber composition of the present invention requires the use of a diene rubber as a rubber component.
- the diene rubber can exhibit performance such as high elasticity and high heat resistance by vulcanization.
- the diene rubber is not particularly limited and may be appropriately selected depending on the intended purpose.
- natural rubber NR
- butadiene rubber BR
- styrene-butadiene rubber SBR
- isoprene rubber IR
- Chloroprene rubber CR
- EPDM ethylene-propylene-diene rubber
- diene-based synthetic rubbers such as acrylonitrile-butadiene rubber (NBR), butyl rubber (IIR), and the like.
- NBR acrylonitrile-butadiene rubber
- IIR butyl rubber
- the rubber composition of the present invention preferably contains natural rubber and styrene-butadiene rubber from the viewpoint of further improving the adhesion to the reinforcing material.
- the proportion of the diene rubber in the rubber component of the rubber composition of the present invention is not particularly limited and can be appropriately selected depending on the purpose, but is preferably 80% by mass or more, more preferably 90% by mass or more. 100 mass% is particularly preferable.
- the ratio of the diene rubber in the rubber component is 80% by mass or more, the adhesive property between the obtained rubber composition and the reinforcing material becomes high, and a laminate of the rubber composition layer and the reinforcing material layer is obtained. The durability of the rubber product used can be improved.
- the ratio of the amount of natural rubber to the total amount of natural rubber and styrene-butadiene rubber is preferably 20% by mass or more, and 60% by mass or less. Is preferred.
- the proportion of the natural rubber is 20% by mass or more, the mechanical strength of a rubber member or a rubber product using the resulting rubber composition can be improved, while it is 60% by mass or less. Thereby, the abrasion resistance and film thickness stability of a rubber member or a rubber product using the obtained rubber composition can be improved.
- the ratio of the amount of natural rubber to the total amount of natural rubber and styrene-butadiene rubber is more preferably 30% by mass or more, and more preferably 50% by mass or less. Further, when natural rubber and styrene-butadiene rubber are used in combination as the diene rubber, the ratio of the amount of styrene-butadiene rubber to the total amount of natural rubber and styrene-butadiene rubber is preferably 40% by mass or more. 80 mass% or less is preferable. When the proportion of the styrene-butadiene rubber is 40% by mass or more, the aging resistance of the rubber member or rubber product using the resulting rubber composition can be improved, while 80% by mass or less.
- the ratio of the blending amount of styrene-butadiene rubber to the total blending amount of natural rubber and styrene-butadiene rubber is more preferably 50% by mass or more, and more preferably 70% by mass or less.
- the rubber composition of the present invention may contain a non-diene rubber (a rubber component other than a diene rubber) as a rubber component in addition to a diene rubber, and is generally used for rubber products without particular limitation.
- Non-diene rubbers can be used.
- the rubber composition of the present invention may be a recycled rubber containing a diene rubber and optionally a non-diene rubber.
- the blending amount thereof is a polymer to be blended by the polymer component in the recycled rubber from the viewpoint of sufficiently ensuring the quality of the rubber product using the resulting rubber composition. It is preferable that it is 20 mass% or less with respect to the total amount.
- wet silica The rubber composition of the present invention requires the use of wet silica.
- Wet silica can be obtained, for example, by using sodium silicate as a raw material, neutralizing the aqueous solution to precipitate silica, and filtering and drying.
- Wet silica is classified into precipitated silica and gel silica, and any wet silica can be used.
- wet silica in the rubber composition it is possible to improve the adhesion between the rubber composition and a reinforcing material such as organic fiber, particularly a reinforcing material that has deteriorated the environment. The reason for this is not clear, but it is thought that the high polarity peculiar to wet silica contributes to the improvement of adhesion.
- Wet silica may be used alone or in combination of two or more.
- the BET specific surface area (N 2 SA) by nitrogen adsorption of wet silica used in the rubber composition of the present invention is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 80 m 2 / g or more. . Since the BET specific surface area by nitrogen adsorption of wet silica is 80 m 2 / g or more, the polarity of the rubber composition is increased, and the adhesion between the rubber composition and the reinforcing material can be further improved. It is possible to suppress the deterioration of the peeling workability when peeling the layer composed of the rubber composition and the environmentally deteriorated reinforcing material layer.
- the BET specific surface area by nitrogen adsorption of wet silica is more preferably 120 m 2 / g or more, further preferably more than 200 m 2 / g.
- the BET specific surface area by nitrogen adsorption of wet silica can be measured based on, for example, ISO5794-1.
- an average primary particle diameter of the wet silica used for the rubber composition of this invention there is no restriction
- the average primary particle diameter of the wet silica is 10 nm or more, a decrease in productivity due to scattering during kneading can be suppressed.
- the average primary particle diameter of wet silica can be calculated
- the amount of wet silica in the rubber composition of the present invention is not particularly limited as long as it is 3 parts by mass or more with respect to 100 parts by mass of the diene rubber, but is preferably 4 parts by mass or more, Moreover, it is preferable that it is less than 10 mass parts.
- the compounding amount of the wet silica in the rubber composition is less than 3 parts by mass with respect to 100 parts by mass of the diene rubber, adhesion to the reinforcing material by mixing the wet silica, particularly the reinforcing material deteriorated by exposure to the atmosphere There is a possibility that the effect of improving the property is not sufficient.
- the compounding amount of wet silica in the rubber composition is 4 parts by mass or more with respect to 100 parts by mass of the diene rubber, the adhesion to the reinforcing material, particularly the reinforcing material deteriorated by exposure to the atmosphere, is sufficient. A high rubber composition can be obtained. Further, when the amount of wet silica in the rubber composition is less than 10 parts by mass with respect to 100 parts by mass of the diene rubber, the increase in the viscosity of the unvulcanized rubber composition is suppressed, and the rubber composition It is possible to suppress a decrease in the productivity of rubber products using. From the same viewpoint, the amount of wet silica in the rubber composition is more preferably 4 parts by mass or more, still more preferably 5 parts by mass or more, and even more preferably 7 parts by mass or more. 9 parts by mass or less is more preferable.
- Carbon black The rubber composition of the present invention requires the use of carbon black. Carbon black, as a reinforcing filler, enhances the modulus and wear resistance of the rubber composition and has a function of appropriately improving the adhesion between the rubber composition and the reinforcing material, particularly the environmentally deteriorated reinforcing material. Can have. Carbon black may be used individually by 1 type, and may use 2 or more types together.
- the BET specific surface area (N 2 SA) by nitrogen adsorption of carbon black used in the rubber composition of the present invention is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 8 m 2 / g or more. Moreover, 100 m ⁇ 2 > / g or less is preferable.
- the carbon black has a BET specific surface area of 8 m 2 / g or more due to nitrogen adsorption, thereby improving the peel strength between the rubber composition and the reinforcing material, particularly the environmentally deteriorated reinforcing material, and sufficient reinforcing properties. Can be secured.
- the BET specific surface area by nitrogen adsorption of carbon black is 100 m 2 / g or less, it is possible to sufficiently suppress the deterioration of the peeling workability when peeling the layer made of the rubber composition and the reinforcing material layer. At the same time, high dispersibility within the rubber composition during kneading can be ensured while sufficient productivity such as scattering resistance and rollability during production is achieved.
- the BET specific surface area by nitrogen adsorption of carbon black is more preferably 25 m 2 / g or more, and more preferably 90 m 2 / g or less.
- the BET specific surface area by nitrogen adsorption of carbon black can be measured by a conventionally well-known method, for example.
- the amount of carbon black in the rubber composition of the present invention is not particularly limited and can be appropriately selected according to the purpose, but is 10 parts by mass or more with respect to 100 parts by mass of the diene rubber. It is preferably 100 parts by mass or less.
- the compounding amount of carbon black in the rubber composition is 10 parts by mass or more with respect to 100 parts by mass of the diene rubber, the peel strength between the rubber composition and the reinforcing material, particularly the environmentally deteriorated reinforcing material. Can be prevented.
- the blending amount of carbon black is 100 parts by mass or less with respect to 100 parts by mass of the diene rubber, the layer made of the rubber composition and the reinforcing material layer are peeled off at the time of endless processing of the conveyor belt, for example. Workability can be improved.
- the compounding amount of carbon black in the rubber composition is more preferably 30 parts by mass or more and more preferably 50 parts by mass or less with respect to 100 parts by mass of the diene rubber.
- the total amount of wet silica and carbon black described above is preferably 30 parts by mass or more and 100 parts by mass or less with respect to 100 parts by mass of the diene rubber. It is preferable that The total amount of wet silica and carbon black is 30 parts by mass or more with respect to 100 parts by mass of the diene rubber, so that the peel strength between the reinforcing material, particularly the reinforcing material deteriorated by exposure to the atmosphere, is excellent. In addition, a rubber composition having sufficiently high adhesion to the reinforcing material can be obtained.
- the total amount of wet silica and carbon black is 80 parts by mass or less with respect to 100 parts by mass of the diene rubber, an increase in the viscosity of the unvulcanized rubber composition is suppressed, and the rubber composition It is possible to suppress a decrease in productivity of rubber products using a product, and to suppress deterioration of workability when peeling the rubber composition and the reinforcing material, for example, during endless processing of a conveyor belt. it can. From the same viewpoint, the total amount of wet silica and carbon black is more preferably 40 parts by mass or more and more preferably 55 parts by mass or less with respect to 100 parts by mass of the diene rubber.
- the rubber composition of the present invention requires the use of calcium carbonate.
- Calcium carbonate reduces the fracture resistance of the rubber composition, thereby improving the adhesion between the rubber composition and reinforcing materials such as organic fibers and other rubber members, as well as the rubber composition. It may also have a function of improving the workability of peeling between the object and the reinforcing material. Calcium carbonate may be used alone or in combination of two or more.
- the average primary particle size of calcium carbonate used in the rubber composition of the present invention is not particularly limited and can be appropriately selected according to the purpose, but is preferably 0.5 ⁇ m or more.
- the average primary particle size of calcium carbonate is more preferably 0.8 ⁇ m or more, and more preferably 13 ⁇ m or less.
- the average primary particle diameter of calcium carbonate is 0.8 ⁇ m or more, an increase in the viscosity of the unvulcanized rubber composition can be suppressed, and stable film thickness stability can be brought about.
- the average primary particle diameter of calcium carbonate is more preferably 1.0 ⁇ m or more, further preferably 2.0 ⁇ m or more, and further preferably 12.0 ⁇ m or less.
- the average primary particle diameter of calcium carbonate can be measured by, for example, observation with a scanning electron microscope.
- the calcium carbonate used in the rubber composition of the present invention is calcium carbonate that has been surface-treated with an organic material as necessary in order to improve dispersibility in the rubber composition. May be.
- the compounding quantity of the calcium carbonate in the rubber composition of this invention needs to be 10 to 120 mass parts with respect to 100 mass parts of diene rubbers. If the blending amount of calcium carbonate in the rubber composition is less than 10 parts by mass with respect to 100 parts by mass of the diene rubber, the cost of the rubber composition may increase, or the viscosity of the unvulcanized rubber composition is too low. As a result, workability may deteriorate due to adhesion to a banbury or roll, and the cohesive failure force of the rubber composition becomes too high, and workability when peeling the rubber composition and the reinforcing material deteriorates. There is a risk that.
- the compounding amount of calcium carbonate in the rubber composition is preferably 20 parts by mass or more, and preferably 100 parts by mass or less.
- the rubber composition of the present invention includes a compounding agent usually used in the rubber industry, for example, a vulcanizing agent such as sulfur, a vulcanization accelerator, Vulcanization accelerators such as zinc oxide, softeners, anti-aging agents, anti-scorch materials, processing aids, lubricants, fillers other than the above-mentioned wet silica such as dry silica, fillers other than carbon black and calcium carbonate, Filler modifiers, tackifiers, colorants, and the like can be appropriately used depending on the purpose.
- the blending amount thereof is 1. in terms of 100 parts by mass of diene rubber from the viewpoint of effectively vulcanizing with a necessary minimum amount.
- the amount is preferably 5 parts by mass or more and 3 parts by mass or less.
- the rubber composition of the present invention can be prepared, for example, by kneading the above-described components using a Banbury mixer, Brabender, kneader or the like.
- the rubber composition thus prepared has the following characteristics. That is, when such a rubber composition is bonded to a reinforcing material, particularly an environmentally deteriorated reinforcing material, and then peeled, a high peel strength can be obtained. Further, when such a rubber composition is bonded to a reinforcing material, particularly an environmentally deteriorated reinforcing material, and then peeled off, the amount of the rubber composition remaining on the reinforcing material is larger.
- the rubber composition of this invention has these characteristics, it can be said that it is excellent in adhesiveness with reinforcing materials, such as organic fiber, especially the environmentally deteriorated reinforcing material. It can be suitably used for the production of rubber products such as belts and hoses. Specifically, when manufacturing rubber products, this rubber composition is interposed between reinforcing materials or between a rubber member and a reinforcing material, and these members are firmly bonded. Can be used. In other words, the rubber composition of the present invention can be used as an adhesive rubber composition. This rubber composition can be used for a conveyor belt, for example, by laminating and laminating with a reinforcing material layer.
- the laminate of the present invention is formed by laminating and adhering at least a layer comprising the rubber composition of the present invention (hereinafter sometimes referred to as “the present rubber composition layer”) and a reinforcing material layer.
- the laminate of the present invention is characterized in that the rubber composition layer and the reinforcing material layer are laminated and bonded.
- the laminate of the present invention includes a laminate obtained by alternately laminating and adhering a plurality of rubber composition layers and one or a plurality of reinforcing material layers. It also includes a laminate formed by laminating two or more of the rubber composition layers laminated on both sides of the material layer and bonding them together.
- the laminated body of this invention may contain rubber layers other than the layer which consists of a rubber composition of this invention in addition to the layer which consists of a rubber composition of this invention.
- the rubber composition layer As the rubber composition layer, the rubber composition of the present invention described above can be used in the form of a sheet by a roll, an extruder or the like.
- the thickness of the rubber composition layer is not particularly limited and may be appropriately selected depending on the purpose. From the viewpoint of suppressing rubber breakage during molding and reducing the thickness of the rubber composition layer, the thickness is from 0.2 mm to 2 mm. It is preferable that In addition, when using this several rubber composition layer, the thickness of each this rubber composition layer may be the same or different.
- the reinforcing material layer may have a function of improving the reinforcing properties of rubber products such as automobile tires, conveyor belts, and hoses.
- the reinforcing material layer is not particularly limited and can be appropriately selected depending on the purpose.
- the reinforcing material layer to be adhered to the rubber composition layer is particularly preferably a layer made of organic fibers (hereinafter sometimes referred to as “organic fiber layer”), and an organic fiber canvas.
- organic fiber layer a layer made of organic fibers
- canvas refers to a woven fabric formed by weaving fibers.
- the material of the organic fiber is not particularly limited and can be appropriately selected according to the purpose.
- aliphatic polyamide such as nylon, aromatic polyamide such as Kevlar, polyethylene terephthalate, polyethylene naphthalate, polyethylene succinate
- polyesters such as polymethylmethacrylate, syndiotactic-1,2-polybutadiene, acrylonitrile-butadiene-styrene copolymers, polystyrene, and fibers made of these copolymers. These may be used individually by 1 type and may use 2 or more types together.
- the warp and weft of the canvas may be made of different materials.
- the reinforcing material layer may be an untreated organic fiber layer, but a film containing resorcinol, formaldehyde, a condensate of resorcinol and formaldehyde, and latex on at least a part of the surface, for example, the entire surface. (Hereinafter, sometimes referred to as “RFL film”) is preferable from the viewpoint of improving the adhesion between the rubber composition layer and the reinforcing material layer.
- RTL film a film containing resorcinol, formaldehyde, a condensate of resorcinol and formaldehyde, and latex on at least a part of the surface, for example, the entire surface.
- the RFL film for example, prior to lamination with the rubber composition layer, is a liquid containing at least a part of the organic fiber, for example, the whole thereof, resorcinol, formaldehyde, a partial condensate of resorcinol and formaldehyde, and a latex (hereinafter, referred to as the RFL film).
- RFL film Sometimes referred to as “RFL dispersion”) and heat treatment.
- a partial condensate of resorcinol and formaldehyde can be obtained by a resorification reaction.
- Examples of the latex contained in the RFL dispersion include vinylpyridine latex, styrene-butadiene copolymer latex (SBR latex), natural rubber latex, from the viewpoint of improving the adhesion between the rubber composition layer and the reinforcing material layer.
- Examples thereof include acrylate copolymer latex, butyl rubber latex, nitrile rubber latex, chloroprene latex, and the like. These may be used individually by 1 type and may use 2 or more types together.
- a reaction catalyst such as acid or alkali may be used in combination as necessary.
- the mass ratio of resorcinol, formaldehyde, a partial condensate of resorcinol and formaldehyde, and latex in the RFL dispersion is not particularly limited.
- the RFL film removes excess adhering liquid by immersing a part or all of organic fibers such as canvas in the RFL dispersion and passing between the rolls or vacuuming as necessary. Then, it can be obtained by performing one-step or multi-step heat treatment.
- the final treatment temperature in the heat treatment is preferably 180 ° C. or more, and more preferably 200 ° C. or more for promoting the reaction and reducing thermal shrinkage during actual use.
- the laminated body of this invention may be equipped with rubber layers other than this rubber composition layer in at least one outermost layer according to the request
- the said laminated body when using the laminated body of this invention for a conveyor belt, the said laminated body may be equipped with the rubber layer which can function as a cover rubber in the outermost layer.
- the rubber layer that can function as a cover rubber is not particularly limited.
- natural rubber NR
- CR ethylene-propylene-diene rubber
- EPDM ethylene-propylene-diene rubber
- NBR acrylonitrile-butadiene rubber
- IIR butyl rubber
- a vulcanizing agent such as sulfur, if necessary, for a polymer component comprising a mixture thereof, Vulcanization accelerators, vulcanization accelerators such as zinc oxide, softeners, anti-aging agents, anti-scorch materials, processing aids, lubricants, carbon black, silica, calcium carbonate, filler modifiers, tackifiers
- a material obtained by kneading a colorant or the like appropriately according to the purpose can be used.
- the cover rubber include an upper cover rubber and a lower cover rubber.
- the same kind of rubber member may be used, or different kinds of rubber members may be used.
- this rubber layer is adjacent to this rubber composition layer on the inner side.
- the method of laminating the rubber composition layer, the reinforcing material layer, and optionally a rubber layer other than the rubber composition layer is not particularly limited, and can be laminated according to a conventional method.
- a laminated body comprising a rubber composition layer, a reinforcing material layer, and a rubber composition layer is first prepared.
- the laminate A can be produced, and this laminate A can be used as it is, but it can also be used as a laminate B in which two or more laminates A are stacked according to the required properties of rubber products such as conveyor belts ( That is, when two laminates A are stacked, a laminate B of [rubber composition layer-reinforcing material layer-rubber composition layer-rubber composition layer-reinforcing material layer-rubber composition layer] is obtained. ).
- the laminate of the present invention is prepared by laminating the rubber layer that can function as the cover rubber described above on the outermost surface of the laminate A or the laminate B according to a conventional method. be able to.
- Examples of the laminate B used in the manufacture of the conveyor belt include those in which 2 to 8 laminates A are stacked.
- the method of adhering the laminated rubber composition layer and the reinforcing material layer, and optionally the rubber layer other than the rubber composition layer and the rubber composition layer is not particularly limited. Examples include a method in which a rubber composition layer, a reinforcing material layer, and optionally a rubber layer other than the present rubber composition layer are placed in a predetermined mold and bonded by vulcanization (so-called vulcanization adhesion).
- the vulcanization temperature is not particularly limited and can be appropriately selected depending on the purpose. From the viewpoint of suppressing overvulcanization while sufficiently bonding the rubber composition layer and the reinforcing material layer. 130 to 170 ° C.
- the vulcanization time is not particularly limited, but in order to sufficiently bond the rubber composition layer and the reinforcing material layer, heat is sufficiently transmitted to the vicinity of the center portion of the laminate and vulcanized. It is preferable to set as appropriate.
- the laminate prepared in this manner has a rubber product because the rubber composition layer and the reinforcing material layer, and optionally the rubber composition layer and the rubber layer other than the rubber composition layer are firmly bonded.
- the durability of rubber products can be improved, and it can be suitably used as a member of rubber products such as automobile tires, conveyor belts, hoses and the like that require high durability. .
- the conveyor belt of this invention is characterized by including the laminated body of this invention mentioned above.
- the conveyor belt of the present invention is not particularly limited except that the laminate of the present invention is used.
- the conveyor belt of the present invention is highly durable because the rubber composition layer and the reinforcing material layer, and optionally the rubber layer other than the rubber composition layer and the rubber composition layer are bonded firmly. Have sex.
- the conveyor belt of this invention also has high reinforcement for the same reason.
- a sheet-like unvulcanized rubber composition (corresponding to a rubber composition layer to be described later) having a thickness of 0.7 mm produced using a 6-inch diameter rolling roll having a width of 25 to 30 cm and a length of 40 to 100 cm A sample was obtained.
- a square with a side of 20 cm is drawn with the center of this sheet-shaped sample as the central point, and a digital thickness gauge ("SMD-" manufactured by Teflock Co., Ltd.) is used for a total of nine points, each vertex of the square, the middle point of each side, and the central point 550S2-LW ”) was used to measure the thickness.
- SMD- digital thickness gauge
- Difference between maximum and minimum thickness is less than 0.04mm ... ⁇
- the difference between the maximum and minimum thickness is 0.04mm or more and less than 0.07mm.
- the difference between the maximum and minimum thickness is 0.07mm or more.
- a canvas composed of warp yarn made of polyethylene terephthalate (twisted number: 16 T / 10 cm, driven number: 83 pieces / 5 cm) and nylon weft yarn (twisted number: 12 T / 10 cm, driven number: 32 pieces / 5 cm) was prepared.
- resorcinol, formalin, water, alkaline reaction catalyst are sequentially mixed and stirred, and after the condensation reaction of resorcinol and formaldehyde is partially advanced, SBR latex, vinylpyridine latex, and water are mixed and stirred, and RFL A dispersion was prepared. And the whole above-mentioned canvas was immersed in the obtained RFL dispersion liquid.
- the dipped canvas was dried and heat-treated so that the final treatment temperature was in the range of 210 ° C. to 240 ° C. to obtain an “undegraded reinforcing material layer” having an RFL film on the surface.
- the RFL dispersion was adjusted so that the latex concentration represented by the total of SBR latex and vinylpyridine latex in the RFL film was 83% by weight.
- an undegraded reinforcing material layer similar to that described above was prepared, and this was left in an ozone tank at 40 ° C. and an ozone concentration of 50 pphm for 60 minutes to obtain a “reduced reinforcing material layer”.
- the amount of rubber remaining on the reinforcing material layer (the amount with rubber) after this test was evaluated by the following method. That is, among the two reinforcing material layers adjacent to the rubber composition layer B after peeling, a reinforcing material layer that was visually determined to have a small amount of rubber was selected, and a sample photograph of the rubber-coated surface was taken. . Next, using the photographed sample photograph, binarization processing and area calculation for the rubber component and the reinforcing material layer portion are performed by image processing software, and the case where rubber remains in an area larger than 60% is indicated by ⁇ , 60-40 The case where the rubber remains in the area of% is marked with ⁇ , and the case where the rubber remains in the area smaller than 40% is marked with x. These results are shown in Tables 1 to 3.
- FIG. 1A a schematic diagram of the peeled surface in the test using the laminate sample I of Example 1 is shown in FIG. 1A, and a schematic diagram of the peeled surface in the test using the laminate sample II of Example 1 is shown.
- FIG. 2A the schematic diagram of the peeling surface in the test using the laminate sample I of Comparative Example 2 is shown in FIG. 2A, and the schematic diagram of the peeling surface in the test using the laminate sample II of Comparative Example 2 is shown. Shown in 2 (b).
- FIG. 3A a schematic diagram of the peeled surface in the test using the laminated sample II of Comparative Example 6 is shown.
- FIG. 3A a schematic diagram of the peeled surface in the test using the laminated sample II of Comparative Example 6 is shown.
- FIG. 3A a schematic diagram of the peeled surface in the test using the laminated sample II of Comparative Example 6 is shown.
- FIG. 3A a schematic diagram of the peeled surface in the test using the laminated sample II of Comparative Example 6
- Nippil SS-50F manufactured by Tosoh Silica Co., Ltd., BET specific surface area by nitrogen adsorption: 82 m 2 / g * 11 Wet silica 3
- Nippil SS-70 manufactured by Tosoh Silica Co., Ltd., BET specific surface area by nitrogen adsorption: 42 m 2 / g * 12 Wet silica 4 ...
- a rubber component containing a diene rubber, wet silica, carbon black, and calcium carbonate are blended, and the blend amount of the wet silica is 3 parts by mass with respect to 100 parts by mass of the diene rubber.
- the rubber composition of the present invention having a blending amount of calcium carbonate of not less than 10 parts by weight and not more than 120 parts by weight with respect to 100 parts by weight of the diene rubber is a layer comprising the rubber composition and undegraded.
- the peel strength is 80 N / 25 mm or more, and the amount of rubber remaining on the reinforcing material layer is large.
- the rubber composition of the present invention is excellent in adhesiveness with an undegraded reinforcing material and adhesiveness with an environmentally deteriorated reinforcing material. This is also clear from the fact that the color of the peeled surface is dark in both FIG. 1 (a) and FIG. 1 (b) (in contrast, in FIG. 2 (b) and FIG. 3 (b), the peeled surface). The color is light). Further, from Tables 1 to 3, the rubber composition of the present invention described above has a peel strength of 300 N / 25 mm or less in the above-described peel test, and thus peels off from an undegraded reinforcing material and an environmentally deteriorated reinforcing material. It can also be seen that workability is high.
- the rubber composition which can bring about high peeling workability
- a laminate using the rubber composition described above which can improve the durability of the rubber product, and a conveyor belt using the laminate described above, which has high durability. can do.
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Abstract
Description
一方で、上述したエンドレス加工をはじめとする、ゴム組成物からなる層と補強材の層とを剥離する作業の際には、ある程度容易に剥離可能であることも重要であり、上記従来のゴム組成物には、高い剥離作業性も求められている。
前記湿式シリカの配合量が、前記ジエン系ゴム100質量部に対して3質量部以上であり、
前記炭酸カルシウムの配合量が、前記ジエン系ゴム100質量部に対して10質量部以上120質量部以下であることを特徴とする。かかるゴム組成物は、補強材、特には環境劣化した補強材との接着性に優れる上、これらとの高い剥離作業性をもたらすことができる。
なお、本発明において「ゴム部材」とは、ゴム製品の製造に用いられ、少なくともゴム成分を含む任意の部材を指す。
以下に、本発明を、その一実施形態に基づき詳細に例示説明する。
本発明のゴム組成物は、少なくとも、ジエン系ゴムを含むゴム成分と、湿式シリカと、カーボンブラックと、炭酸カルシウムと、更に必要に応じてその他の成分とを配合してなる。
本発明のゴム組成物は、ゴム成分としてジエン系ゴムを用いることを要する。ジエン系ゴムは、加硫により高弾性や高い耐熱性等の性能を呈し得る。前記ジエン系ゴムとしては、特に制限はされず、目的に応じて適宜選択することができ、例えば、天然ゴム(NR);ブタジエンゴム(BR)、スチレン-ブタジエンゴム(SBR)、イソプレンゴム(IR)、クロロプレンゴム(CR)、エチレン-プロピレン-ジエンゴム(EPDM)、アクリロニトリル-ブタジエンゴム(NBR)、ブチルゴム(IIR)などのジエン系合成ゴム;等が挙げられる。これらは、1種単独で使用してもよいし、2種以上を併用してもよい。
特に、本発明のゴム組成物は、補強材との接着性をより向上させる観点から、天然ゴム及びスチレン-ブタジエンゴムを含むことが好ましい。
また、ジエン系ゴムとして天然ゴム及びスチレン-ブタジエンゴムを併用する場合、天然ゴム及びスチレン-ブタジエンゴムの総配合量に対するスチレン-ブタジエンゴムの配合量の割合は、40質量%以上が好ましく、また、80質量%以下が好ましい。上記スチレン-ブタジエンゴムの配合量の割合が40質量%以上であることにより、得られるゴム組成物を用いたゴム部材又はゴム製品の耐老化性を向上させることができ、一方、80質量%以下であることにより、得られるゴム組成物を用いたゴム部材又はゴム製品の耐屈曲亀裂性を向上させることができる。同様の観点から、天然ゴム及びスチレン-ブタジエンゴムの総配合量に対するスチレン-ブタジエンゴムの配合量の割合は、50質量%以上がより好ましく、また、70質量%質量%以下がより好ましい。
また、本発明のゴム組成物には、ジエン系ゴム及び任意に非ジエン系ゴムを含む再生ゴムを用いることもできる。本発明のゴム組成物に再生ゴムを用いる場合、その配合量としては、得られるゴム組成物を用いたゴム製品の品質を十分に確保する観点から、再生ゴム中のポリマー成分が、配合するポリマー総量に対して20質量%以下であることが好ましい。
本発明のゴム組成物は、湿式シリカを用いることを要する。湿式シリカは、例えば、珪酸ソーダを原料とし、その水溶液を中和してシリカを析出させ、ろ過・乾燥して得ることができる。湿式シリカは、沈降法シリカとゲル法シリカに類別されるが、いずれの湿式シリカも用いることができる。湿式シリカをゴム組成物に用いることにより、かかるゴム組成物と、有機繊維などの補強材、特には環境劣化した補強材との接着性を向上させることができる。この理由は明らかではないが、湿式シリカ特有の高い極性が、接着性の向上に寄与しているものと考えられる。湿式シリカは、1種単独で使用してもよいし、2種以上を併用してもよい。
なお、湿式シリカの窒素吸着によるBET比表面積は、例えば、ISO5794-1に準拠して測定することができる。
なお、湿式シリカの平均一次粒子径は、例えば、透過型電子顕微鏡像、及び/又はBET比表面積を用いた算出などにより求めることができる。BET比表面積を用いた算出の方法としては、例えば、経済産業省発行「ナノマテリアル情報提供シート:非晶質コロイダルシリカ(平成23年3月時点)参考資料6.」に記載された方法などの、従来公知の方法が挙げられる。
本発明のゴム組成物は、カーボンブラックを用いることを要する。カーボンブラックは、補強性充填剤として、ゴム組成物のモジュラスや耐摩耗性を高めるとともに、このゴム組成物と、補強材、特には環境劣化した補強材との接着性を適度に向上させる機能を有し得る。カーボンブラックは、1種単独で使用してもよいし、2種以上を併用してもよい。
なお、カーボンブラックの窒素吸着によるBET比表面積は、例えば、従来公知の方法により測定することができる。
本発明のゴム組成物は、炭酸カルシウムを用いることを要する。炭酸カルシウムは、ゴム組成物の耐破壊性を低減し、それによって、当該ゴム組成物と、有機繊維などの補強材や、他のゴム部材との接着性を向上させる機能に加え、当該ゴム組成物と補強材との剥離作業性を向上させる機能をも有し得る。炭酸カルシウムは、1種単独で使用してもよいし、2種以上を併用してもよい。
また、炭酸カルシウムの平均一次粒子径は、0.8μm以上がより好ましく、また、13μm以下がより好ましい。炭酸カルシウムの平均一次粒子径が0.8μm以上であることにより、未加硫のゴム組成物の粘度の増加を抑制して、安定した膜厚安定性をもたらすことができ、また、13μm以下であることにより、加硫後のゴム組成物のモジュラス及び引裂き強さの低下を抑制して、安定した補強効果を得ることができる。同様の観点から、炭酸カルシウムの平均一次粒子径は、1.0μm以上が更に好ましく、2.0μm以上が一層好ましく、また、12.0μm以下が更に好ましい。
なお、炭酸カルシウムの平均一次粒子径は、例えば、走査型電子顕微鏡観察などにより測定することができる。
本発明のゴム組成物には、上述のゴム成分、湿式シリカ、カーボンブラック、炭酸カルシウム以外にも、ゴム業界で通常使用される配合剤、例えば、硫黄などの加硫剤、加硫促進剤、酸化亜鉛などの加硫促進助剤、軟化剤、老化防止剤、スコーチ防止材、加工助剤、潤滑剤、乾式シリカ等の上述の湿式シリカ以外のシリカ、カーボンブラック及び炭酸カルシウム以外の充填剤、充填剤改質剤、粘着付与剤、着色剤などを、目的に応じて適宜用いることができる。
本発明のゴム組成物は、例えば、上述した成分を、バンバリーミキサー、ブラベンダー、ニーダー等を用いて混練することにより調製することができる。
このようにして調製されたゴム組成物は、以下のような特徴を有する。即ち、かかるゴム組成物と、補強材、特には環境劣化した補強材とを接着させ、その後に剥離した場合に、高い剥離強度が得られる。また、かかるゴム組成物と、補強材、特には環境劣化した補強材とを接着させ、その後に剥離した場合に、補強材上に残るゴム組成物の量がより多い。そして、本発明のゴム組成物は、これらの特徴を有することから、有機繊維などの補強材、特には環境劣化した補強材との接着性に優れているといえ、例えば、自動車用タイヤ、コンベアベルト、ホース等のゴム製品の製造に好適に用いることができる。具体的には、ゴム製品の製造の際、このゴム組成物を、補強材同士の間に介在させたり、ゴム部材と補強材との間に介在させたりし、これらの部材を強固に接着するのに用いることができる。言い換えれば、本発明のゴム組成物は、接着用ゴム組成物として用いることができる。このゴム組成物は、例えば、層状にして、補強材層と積層することにより、コンベアベルトに用いることができる。そして、かかるコンベアベルトのエンドレス加工時において、上記のゴム組成物により接着した補強材同士を、又はゴム部材と補強材とを剥離した後に、エンドレス接着用ゴムなどを用いてこれらを再接着する際にも、強固に接着することができる。
本発明の積層体は、少なくとも本発明のゴム組成物からなる層(以下、「本ゴム組成物層」と称する場合がある。)と補強材層とを、積層し、接着させてなることを特徴とする。言い換えれば、本発明の積層体は、本ゴム組成物層と補強材層とが、積層及び接着されていることを特徴とする。なお、本発明の積層体は、複数の本ゴム組成物層と、1層又は複数の補強材層とを、それぞれ交互に積層し、接着させてなる積層体を包含するものとし、また、補強材層の両面に本ゴム組成物層を積層し、接着させたものを更に2つ以上積層してなる積層体をも包含するものとする。また、本発明の積層体は、本発明のゴム組成物からなる層に加え、本発明のゴム組成物からなる層以外のゴム層を含んでいてもよい。
本ゴム組成物層としては、上述した本発明のゴム組成物を、圧延ロールや、押出成形機等の装置によりシート状にしたものを用いることができる。
本ゴム組成物層の厚さとしては、特に制限はされず、目的に応じて適宜選択することができるが、成型中におけるゴム切れの抑制や、薄膜化の観点から、0.2mm以上2mm以下であることが好ましい。なお、複数の本ゴム組成物層を用いる場合、各本ゴム組成物層の厚さは、同一でも異なっていてもよい。
補強材層は、自動車用タイヤ、コンベアベルト、ホース等のゴム製品の補強性を向上させる機能を有し得る。ここで、補強材層としては、特に制限はされず、目的に応じて適宜選択することができる。なお、本ゴム組成物層の接着の対象となる補強材層としては、特に、有機繊維からなる層(以下、「有機繊維層」と称する場合がある。)が好ましく、また、有機繊維の帆布の層がより好ましい。なお、本明細書において「帆布」とは、繊維と繊維とを織ってなる織物を指す。
また、RFL分散液の調製の際は、必要に応じて酸・アルカリ等の反応触媒を併用してもよい。
なお、RFL分散液における、レゾルシノールと、ホルムアルデヒドと、レゾルシノール及びホルムアルデヒドの一部縮合体と、ラテックスとの質量比は、特に限定されない。
ここで、熱処理における最終処理温度は、反応促進、および実使用時の熱収縮低減の為180℃以上が好ましく、特に200℃以上であることが好ましい。
また、本発明の積層体は、所望のゴム製品の要求に応じ、少なくとも一方の最外層に、本ゴム組成物層以外のゴム層を備えていてもよい。例えば、本発明の積層体をコンベアベルトに用いる場合、当該積層体は、最外層に、カバーゴムとして機能し得るゴム層を備えていてもよい。ここで、カバーゴムとして機能し得るゴム層としては、特に制限はされず、例えば、天然ゴム(NR)、ブタジエンゴム(BR)、スチレン-ブタジエンゴム(SBR)、イソプレンゴム(IR)、クロロプレンゴム(CR)、エチレン-プロピレン-ジエンゴム(EPDM)、アクリロニトリル-ブタジエンゴム(NBR)、ブチルゴム(IIR)等、又はこれらの混合物からなるポリマー成分に対して、必要に応じて硫黄などの加硫剤、加硫促進剤、酸化亜鉛などの加硫促進助剤、軟化剤、老化防止剤、スコーチ防止材、加工助剤、潤滑剤、カーボンブラック、シリカ、炭酸カルシウム、充填剤改質剤、粘着付与剤、着色剤などを、目的に応じて適宜混練したものを用いることができる。なお、カバーゴムとしては、上面カバーゴム及び下面カバーゴムが挙げられ、それぞれ同種のゴム部材を用いても良いし、異種のゴム部材を用いても良い。
また、本発明の積層体が最外層に本ゴム組成物層以外のゴム層を備える場合、かかるゴム層は、その内側で本ゴム組成物層と隣接していることが好ましい。
本ゴム組成物層と補強材層と、任意で本ゴム組成物層以外のゴム層とを積層する方法としては、特に限定はされず、常法に従って積層することができる。
ここで、本ゴム組成物層と補強材層とを用い、従来から知られているカレンダー工程を使用して積層する場合、まずゴム組成物層-補強材層-ゴム組成物層からなる積層体Aを作製することができ、この積層体Aのままでも使用できるが、コンベアベルト等のゴム製品の必要特性に応じ、積層体Aを2個以上重ねた積層体Bとして使用することもできる(即ち、積層体Aを2個重ねた場合には、[ゴム組成物層-補強材層-ゴム組成物層-ゴム組成物層-補強材層-ゴム組成物層]の積層体Bが得られる)。そして、例えばコンベアベルトの製造においては、積層体A又は積層体Bの最外面に対し、上述したカバーゴムとして機能し得るゴム層を常法に従って積層することにより、本発明の積層体を調製することができる。なお、コンベアベルトの製造の際に用いられる上記積層体Bとしては、積層体Aを2~8個重ねたものが挙げられる。
また、積層した本ゴム組成物層と補強材層、及び任意で本ゴム組成物層と本ゴム組成物層以外のゴム層を接着する方法としては、特に限定はされないが、例えば、積層した本ゴム組成物層、補強材層及び任意で本ゴム組成物層以外のゴム層を、所定のモールド内に配置し、加硫することにより接着する方法(いわゆる加硫接着)が挙げられる。
加硫の温度としては、特に限定はされず、目的に応じて適宜選択することができるが、本ゴム組成物層と補強材層とを十分に接着させつつ、過加硫を抑制する観点から、130~170℃であることが好ましい。また、加硫時間としては、特に限定はされないが、本ゴム組成物層と補強材層とを十分に接着させるべく、積層体の中心部付近にも十分に熱が伝達され、加硫されるように適宜設定することが好ましい。
本発明のコンベアベルトは、上述した本発明の積層体を含むことを特徴とする。本発明のコンベアベルトは、本発明の積層体を用いる以外、特に制限はされない。
本発明のコンベアベルトは、上述の通り、本ゴム組成物層と補強材層、及び任意で本ゴム組成物層と本ゴム組成物層以外のゴム層が強固に接着されているため、高い耐久性を有する。また、本発明のコンベアベルトは、同様の理由で、高い補強性をも有する。
バンバリーミキサーを用い、表1~3に示す配合(単位:質量部)に、常法に従って選択された量の加工助剤、潤滑剤、硫黄、加硫促進剤、及び酸化亜鉛を加えて、未加硫のゴム組成物を調製した。
調製した未加硫のゴム組成物を用いて、以下の手順により、膜厚安定性の評価を行った。
6インチ径の圧延ロールを用いて作製した厚さ0.7mmのシート状の未加硫ゴム組成物(後述するゴム組成物層に相当)を25~30cm幅、40~100cm長さとしたものを、サンプルとした。このシート状のサンプルの中央部を中心点として1辺20cmの正方形を描き、この正方形の各頂点、各辺の中点及び中心点の計9点について、デジタルシックネスゲージ(テフロック社製「SMD-550S2-LW」)を用いて、厚さを測定した。そして、上記計9点における厚さの最大値と最小値の差を算出し、以下の基準で評価した。
厚さの最大値と最小値の差が0.04mm未満・・・◎
厚さの最大値と最小値の差が0.04mm以上0.07mm未満・・・○
厚さの最大値と最小値の差が0.07mm以上・・・×
ポリエチレンテレフタレート製の縦糸(撚数:16T/10cm、打込み数:83本/5cm)と、ナイロン製の横糸(撚数:12T/10cm、打込み数:32本/5cm)とからなる帆布を準備した。一方で、レゾルシノール、ホルマリン、水、アルカリ系反応触媒を順次混合・撹拌し、レゾルシノールとホルムアルデヒドの縮合反応を一部進行させた後、SBRラテックス、ビニルピリジンラテックス、水を混合・撹拌して、RFL分散液を調製した。そして、上述の帆布の全体を、得られたRFL分散液中に浸漬させた。浸漬後の帆布に対し、最終処理温度が210℃~240℃の範囲となるように乾燥及び熱処理を行い、表面にRFL膜を備える「未劣化の補強材層」を得た。なお、未劣化の補強材層中のRFL膜の形成にあたっては、RFL膜におけるSBRラテックス及びビニルピリジンラテックスの合計で表されるラテックス濃度が83重量%になるように、RFL分散液を調整した。
更に、上述と同様の未劣化の補強材層を用意し、これを40℃、オゾン濃度50pphmのオゾン槽中で60分間放置し、「劣化後の補強材層」を得た。
まず、積層体サンプル用とは別に、上述の未加硫のゴム組成物を、8±1gの重量で塊状に切り出し、キュラストメータ(JSR株式会社製、「CURELASTOMETER7」)により、JIS K6300-2及びISO6502に準拠して、当該未加硫のゴム組成物の155℃における90%加硫時間(tc(90))を求めた。
次に、上述の未加硫のゴム組成物を用い、6インチ径の圧延ロールで、厚さ0.7mmのゴム組成物層を作製した。次いで、このゴム組成物層と上述の補強材層とを用い、[ゴム組成物層A-未劣化の補強材層-ゴム組成物層B-未劣化の補強材層-ゴム組成物層C-未劣化の補強材層-ゴム組成物層D]の7層構造の未加硫の積層体サンプルを調製した。この未加硫の積層体サンプルを、所定のモールド内で、148℃で、上述のようにして求めたtc(90)の1.5倍の時間だけ加硫し、室温下で一晩放置して、加硫済み積層体サンプルIを得た。
また、上述と同様のやり方で、[ゴム組成物層A-劣化後の補強材層-ゴム組成物層B-劣化後の補強材層-ゴム組成物層C-劣化後の補強材層-ゴム組成物層D]の7層構造の未加硫の積層体サンプルを調製し、上述と同様のやり方で、加硫済み積層体サンプルIIを得た。
なお、上記のゴム組成物層A~Dは、同種のゴム組成物から調製したものである。
これらの積層体サンプルI,IIを用い、以下の手順により、ゴム組成物層と補強材層との接着性を評価した。
上述の積層体サンプルを25mm幅で縦糸方向に切断した後、ゴム組成物層Bの部分にナイフで10~20mmの切り込みを入れ、株式会社ティー・エス・イー製の「オートコム万能試験機AC-10kN」を用い、切り込み部から剥離する試験を行った。ここで、剥離角度は90°、剥離速度は50mm/分とし、この試験時における剥離強度(N/25mm)を測定した。そして、積層体サンプルI及びIIに関して、以下の通り、接着性及び剥離作業性の評価を行った。これらの結果を表1~3に示す。
-接着性の評価-
100N/25mmより大きい・・・◎
100~80N/25mm・・・○
80N/25mmより小さい・・・×
-剥離作業性の評価-
300N/25mm以下・・・◎
300N/25mmより大きい・・・×
*2 炭酸カルシウム1・・・日東粉化工業株式会社製「NS#100」、平均一次粒子径:2.1μm
*3 炭酸カルシウム2・・・日東粉化工業株式会社製「NN#200」、平均一次粒子径:14.8μm
*4 炭酸カルシウム3・・・白石カルシウム株式会社製「ソフトン3200」、平均一次粒子径:0.7μm
*5 炭酸カルシウム4・・・日東粉化工業株式会社製「NN#500」、平均一次粒子径:4.4μm
*6 カーボンブラック1・・・東海カーボン株式会社製「シーストV」
*7 カーボンブラック2・・・キャボットジャパン株式会社製「ショウブラックN330」
*8 カーボンブラック3・・・東海カーボン株式会社製「シースト6」
*9 湿式シリカ1・・・東ソー・シリカ株式会社製「Nipsil AQ」、窒素吸着によるBET比表面積:205m2/g、平均一次粒子径:16nm
*10 湿式シリカ2・・・東ソー・シリカ株式会社製「Nipsil SS-50F」、窒素吸着によるBET比表面積:82m2/g
*11 湿式シリカ3・・・東ソー・シリカ株式会社製「Nipsil SS-70」、窒素吸着によるBET比表面積:42m2/g
*12 湿式シリカ4・・・エボニックデグサ社製「ウルトラシルVN3」、窒素吸着によるBET比表面積:175m2/g
*13 湿式シリカ5・・・東ソー・シリカ株式会社製「Nipsil NA」、窒素吸着によるBET比表面積:135m2/g
*14 乾式シリカ1・・・日本アエロジル株式会社性「AEROSIL 130」、窒素吸着によるBET比表面積:130m2/g
Claims (11)
- ジエン系ゴムを含むゴム成分と、湿式シリカと、カーボンブラックと、炭酸カルシウムとを配合してなるゴム組成物であって、
前記湿式シリカの配合量が、前記ジエン系ゴム100質量部に対して3質量部以上であり、
前記炭酸カルシウムの配合量が、前記ジエン系ゴム100質量部に対して10質量部以上120質量部以下であることを特徴とする、ゴム組成物。 - 前記炭酸カルシウムの平均一次粒子径が、0.8μm以上13μm以下である、請求項1に記載のゴム組成物。
- 前記湿式シリカの配合量が、前記ジエン系ゴム100質量部に対して4質量部以上9質量部以下である、請求項1又は2に記載のゴム組成物。
- 前記ゴム成分が、天然ゴム及びスチレン-ブタジエンゴムを含む、請求項1~3のいずれかに記載のゴム組成物。
- 前記天然ゴム及びスチレン-ブタジエンゴムの総配合量に対する前記天然ゴムの配合量の割合が、20質量%以上60質量%以下である、請求項4に記載のゴム組成物。
- 前記湿式シリカの窒素吸着によるBET比表面積が、80m2/g以上である、請求項1~5のいずれかに記載のゴム組成物。
- 前記湿式シリカの窒素吸着によるBET比表面積が、200m2/g超である、請求項1~6のいずれかに記載のゴム組成物。
- 前記カーボンブラックの窒素吸着によるBET比表面積が、8m2/g以上100m2/g以下である、請求項1~7のいずれかに記載のゴム組成物。
- ゴム部材と補強材との間、又は、補強材同士の間に介在させ、これらを接着するために用いられる、請求項1~8のいずれかに記載のゴム組成物。
- 請求項1~9のいずれかに記載のゴム組成物からなる層と補強材層とが、積層及び接着されていることを特徴とする、積層体。
- 請求項10に記載の積層体を含むことを特徴とする、コンベアベルト。
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JP2017155177A (ja) * | 2016-03-04 | 2017-09-07 | 株式会社ブリヂストン | ゴム組成物、積層体、及びコンベアベルト |
EP3424998A4 (en) * | 2016-03-04 | 2019-03-06 | Bridgestone Corporation | RUBBER COMPOSITION, LAMINATED BODY, AND CONVEYOR BAND |
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