WO2020059215A1 - 物品の移動方法、鉱石の運搬方法及び鉱石の運搬装置 - Google Patents
物品の移動方法、鉱石の運搬方法及び鉱石の運搬装置 Download PDFInfo
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- WO2020059215A1 WO2020059215A1 PCT/JP2019/021827 JP2019021827W WO2020059215A1 WO 2020059215 A1 WO2020059215 A1 WO 2020059215A1 JP 2019021827 W JP2019021827 W JP 2019021827W WO 2020059215 A1 WO2020059215 A1 WO 2020059215A1
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- ore
- coating
- article
- coating layer
- cleavable
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60P—VEHICLES ADAPTED FOR LOAD TRANSPORTATION OR TO TRANSPORT, TO CARRY, OR TO COMPRISE SPECIAL LOADS OR OBJECTS
- B60P1/00—Vehicles predominantly for transporting loads and modified to facilitate loading, consolidating the load, or unloading
- B60P1/04—Vehicles predominantly for transporting loads and modified to facilitate loading, consolidating the load, or unloading with a tipping movement of load-transporting element
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60P—VEHICLES ADAPTED FOR LOAD TRANSPORTATION OR TO TRANSPORT, TO CARRY, OR TO COMPRISE SPECIAL LOADS OR OBJECTS
- B60P3/00—Vehicles adapted to transport, to carry or to comprise special loads or objects
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D33/00—Superstructures for load-carrying vehicles
- B62D33/02—Platforms; Open load compartments
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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
- B65G11/00—Chutes
- B65G11/16—Interior surfaces; Linings
Definitions
- the present disclosure relates to a method of moving an article, a method of transporting ore, and a device for transporting ore.
- dump trucks and other vehicles are used to repeatedly load and transport mined ore on its loading platform, and then remove the ore from the loading platform at the collection site.
- the operation of unloading the ore from the bed is generally performed by shifting the bed from the laid state to the upright state to incline the bed and slide the ore down (chute). At this time, the entire amount of the loaded ore cannot be slid off from the loading platform, and a part of the ore easily remains on the loading platform and is likely to be left unloaded. In particular, the ore easily adheres to the corners of the bed and remains easily.
- the amount of ore unloaded from the loading bed decreases, and since the ore returns to the mining site with the unloaded loading, the fuel cost of vehicles due to the mass of the unloaded ore increases and the loading site becomes unloaded. Problems such as a decrease in the amount of ore that can be loaded will occur.
- Unloading of ore is particularly likely to occur when the ore contains clay because the ore easily adheres to the bed via the clay.
- the amount of unloaded ore tends to increase each time loading and unloading of ore is repeated.
- a method of improving the problem of unloading a method is known in which a resin liner is installed on the surface (inner wall surface) of the cargo bed of a vehicle to improve the slippage of the load when unloading.
- a liner that slides at the time of unloading is provided on a carrier, and a flexible body provided at a location where a load is likely to adhere is extended by using the sliding force of the liner at the time of unloading.
- a method of suppressing the adhesion of the load above the flexible body so that a large amount of the load can be dropped at the time of unloading.
- the method of installing the resin-made liner on the carrier has a problem that the liner needs to be fixed to the carrier with bolts, so that the installation operation is complicated, and it is difficult to install the liner on the corner of the carrier.
- there are various shapes of the loading platform and it is necessary to search for a liner that matches the shape or to newly manufacture the liner. If there is no suitable liner and it cannot be manufactured, there is a problem that it cannot be installed. In addition, when manufacturing newly, enormous cost is needed. Further, in the loading platform described in Patent Document 1, there is a problem that the installation work of the liner and the flexible body is complicated, and it is impossible to install the loading platform depending on the shape of the loading platform.
- Resin liners may be damaged, such as broken, cracked or chipped, by strong impact when loading ore. In extreme cases, a single transfer can damage the liner. Each time these damages occur, the liner must be repaired or replaced, resulting in inefficient transport operations and increased costs. Further, when the liner is broken, a large amount of resin is mixed into the ore. It is not easy to remove this resin, and this also leads to a reduction in the efficiency of the transport operation and an increase in cost. Furthermore, when a liner is installed, the weight of the carrier increases due to the weight of the liner, and the capacity that can be loaded onto the carrier decreases due to the thickness of the liner. An increase is inevitable. Therefore, there is a need for a method of suppressing the unloading of ore on the bed by a simple method without using a liner.
- the ore is moved using a belt conveyor and a transport chute at the collecting place.
- the transport chute is equipment for dropping the ore along the inclined surface.
- a part of the ore may adhere to the inclined surface and remain without falling, or the slip speed may be poor and the falling speed may be slow. Therefore, there is a need for a method of easily dropping the ore without adhering to the transport chute.
- the present disclosure has been made in view of the above-mentioned problems of the related art, and when an article on a mounting surface is slid and moved, the article adheres to the mounting surface and does not remain. It is an object of the present invention to provide a method of moving an article that can be easily moved. Another object of the present disclosure is to provide a method of transporting ore that can suppress unloading of ore to a bed. Another object of the present disclosure is to provide an ore transport method and an ore transport device that can suppress ore adhesion to a mounting surface.
- one embodiment of the present disclosure is a method of moving an article on a mounting surface, wherein the mounting surface includes a coating layer containing a cleavable substance, and the mounting surface is inclined. Then, a method of moving the article is provided, in which a part of the cleavable substance in contact with the article is cleaved to slide down the article together with a part of the cleavable substance.
- the mounting surface is provided with a coating layer containing a cleavable substance, and the article is slid down together with a part of the cleavable substance by inclining the mounting surface, whereby the article is placed on the mounting surface.
- the article can be easily moved without being left attached to the article.
- the above-described movement method is a movement method utilizing the cleavage property of a cleavable substance, and by utilizing this property, various articles including ores can be easily moved.
- the article has adhesiveness, since the cleaved substance existing on the sticking mounting surface can slide down, the article adheres to the mounting surface. The remaining can be suppressed. Further, the greater the stress or impact applied to the mounting surface, the more the cleavage of the cleavable substance is promoted. Therefore, the greater the mass of the article, the more the effect of the moving method can be exhibited.
- the cleavable substance may include graphite. Since graphite has excellent slipperiness and has high cleavage properties due to slippage between graphene sheets in graphite, it is used in the above-described movement method in which an article is slid down using cleavage properties. Suitable for
- the coating layer may further include a binder.
- the binder may contain a water-soluble resin.
- the adhesive strength of the coating layer to the mounting surface can be increased, and peeling of the coating layer can be suppressed.
- the article can be easily slid down by inclining the mounting surface.
- the mounting surface may be inclined by 1 to 90 °. By tilting the mounting surface at the above angle, the article can be moved more easily without the article being attached to the mounting surface and remaining.
- the article may include ore.
- the ore may include iron ore and clay.
- the above moving method is suitable as a method for moving ore on a mounting surface.
- clay is mixed in the mined ore, and the clay easily adheres to the mounting surface, so that it is likely to be a factor that causes the unloading on the carrier or the adhesion to the transport chute.
- the ore can be slid down together with the cleavable substance, thereby suppressing the ore from adhering to the carrier or the transport chute and remaining. can do.
- the moisture content of the article may be 0 to 50% by mass.
- the water content when the water content is 15 to 35% by mass, the article tends to easily adhere to the mounting surface.
- the cleavable substance existing on the surface can be easily slid down.
- the placing surface may be a surface of a bed of the vehicle.
- the mounting surface may be an inclined surface of the transport chute.
- the present disclosure also includes forming a coating layer containing a cleavable substance on at least a part of a surface of a bed of a vehicle for transporting ore, loading the ore on the bed, transporting the ore, and then transporting the ore.
- An ore transportation method is provided, in which a bed is inclined to cleave a part of the cleavable substance in contact with the ore, thereby sliding the ore down together with a part of the cleavable substance. According to this transportation method, unloading of the ore on the cargo bed is suppressed, and the ore transportation operation can be performed efficiently.
- the present disclosure is also directed to, in a state in which the mounting surface provided with the coating layer containing the cleavable substance is inclined, ore on the mounting surface, by cleaving a part of the cleavable material in contact with the ore. And a method for transporting ore, comprising a step of sliding down with a part of the cleavable substance. According to this transportation method, the adhesion of the ore to the mounting surface is suppressed, and the ore transportation operation can be performed efficiently.
- the present disclosure is also an ore transport device having a mounting surface provided with a coating layer containing a cleavable substance, wherein the mounting surface is provided on the mounting surface in a state where the mounting surface is inclined.
- the ore transport device is a surface that slides down the ore along with a part of the cleavable material by cleaving a part of the cleavable material in contact with the ore. According to such a transport device, the adhesion of the ore to the mounting surface is suppressed, and the ore transport operation can be performed efficiently.
- the present disclosure also provides a method of coating a vehicle bed for transporting ore, comprising: coating a surface of at least a portion of the bed with a coating composition containing graphite and a solvent; And a drying step of removing.
- the slipperiness of the bed surface can be significantly improved, and when the ore is lowered from the bed by tilting the bed.
- the ore can be easily slid off.
- mined ore may contain clay, and clay tends to adhere to the surface of the loading platform, which tends to cause unloading.However, by coating the loading platform with the above-mentioned coating method, clay is added to the ore. , The ore can be easily slid down.
- the coating method can apply the coating composition to the surface of the carrier by any means and dry it, the carrier can be easily coated, so that it is extremely simple compared to the case where the liner is installed on the carrier.
- the sliding property of the carrier can be improved.
- the coating applied to the carrier is peeled off, it can be easily re-coated again and can be partially repaired, so that maintenance is easy, and when the liner is broken and replaced. There is no such complication and no waste is generated.
- the coating composition may further contain a binder.
- the binder may contain a water-soluble resin.
- the solvent may include water.
- the solvent may further contain an alcohol.
- the binder contains a water-soluble resin, water is easily used as a solvent.
- water is used as the solvent, the coating operation becomes easy.
- the solvent contains alcohol, the drying step is easily performed in a short time.
- the coating may be performed by spray application.
- spray application coating can be performed efficiently and uniformly in a short time.
- the ore may include iron ore and clay.
- the method of the present disclosure is particularly effective as a method for coating a bed of a vehicle that transports ore.
- the drying step may be performed within 20 minutes by means including heating and / or blowing.
- the solvent in the coating composition can be efficiently removed in a short time, and the drying step can be completed within 20 minutes.
- the coating method includes: a polishing step of polishing a surface of a first coating layer formed on at least a part of a surface of the carrier through the coating step and the drying step; and a polished first coating layer.
- a second coating step of coating at least a part of the surface with a second coating composition containing graphite and a solvent, and a second drying step of removing the solvent in the second coating composition. May be further provided.
- the coating of the loading platform may be performed again by the above-described coating method after a lapse of 12 hours to 14 days. This coating operation may be repeated every 12 hours to 14 days. By performing the coating at intervals of 12 hours to 14 days, it is possible to continuously maintain excellent slipperiness of the cargo bed surface.
- the present disclosure also provides a coating composition containing a binder containing a water-soluble resin, graphite, and a solvent containing water.
- the present disclosure also provides a coating composition for coating a vehicle bed for transporting ore, comprising graphite and a solvent.
- the sliding property of the loading surface can be greatly improved, and when the ore is lowered from the loading surface by tilting the loading surface, a coating layer capable of easily sliding down the ore is provided. Can be formed on the surface.
- the present disclosure also provides a carrier having at least a part of its surface coated by the coating method of the present disclosure.
- a carrier having at least a part of its surface coated by the coating method of the present disclosure.
- Such a bed has excellent surface slipperiness, and when the ore is lowered from the bed by inclining the bed, the ore can be easily slid down.
- the present disclosure further includes coating at least a portion of a surface of a bed of a vehicle for transporting ore by the coating method of the present disclosure, loading the ore on the bed, and transporting the ore.
- the ore is provided with a method of transporting ore, in which the ore is slid off from the bed with a part of the graphite by inclining the ore. According to this transportation method, unloading of the ore on the cargo bed is suppressed, and the ore transportation operation can be performed efficiently.
- a method of moving an article that can easily move an article without sticking and remaining on the mounting surface when the article on the mounting surface is slid and moved. can do. Further, according to the present disclosure, it is possible to provide a method for transporting ore that can suppress unloading of ore on a cargo bed. Further, according to the present disclosure, it is possible to provide an ore transport method and an ore transport device that can suppress ore adhesion to a mounting surface. Further, according to the present disclosure, it is possible to provide a method of coating a bed which can suppress unloading of ore on the bed. Further, according to the present disclosure, it is possible to provide a coating composition capable of forming a coating layer capable of suppressing unloading of ore on a cargo bed.
- the term “layer” includes, when observed as a plan view, a structure partially formed in addition to a structure formed over the entire surface.
- the term “step” is used not only for an independent step but also for the case where the intended action of the step is achieved even if it cannot be clearly distinguished from other steps. included.
- the numerical range indicated by using “to” indicates a range including the numerical values described before and after “to” as the minimum value and the maximum value, respectively.
- the content of each component in the composition when there are a plurality of substances corresponding to each component in the composition, unless otherwise specified, the total of the plurality of substances present in the composition Means quantity.
- the exemplified materials may be used alone or in combination of two or more unless otherwise specified.
- the upper limit or the lower limit of the numerical range of a certain stage may be replaced with the upper limit or the lower limit of the numerical range of another stage.
- the upper limit or the lower limit of the numerical ranges may be replaced with the values shown in the embodiments.
- the method of moving an article according to the present embodiment is a method of moving an article on a mounting surface, wherein the mounting surface includes a coating layer containing a cleavable substance, and the mounting surface is inclined,
- the method is a method of cleaving a part of the cleavable substance in contact with the cleavable substance, thereby sliding down the article together with a part of the cleavable substance.
- FIG. 1 is a schematic view (cross-sectional view) showing an embodiment of a method for moving an article.
- the article 8 is placed on the mounting surface 6 a on the surface of the coating layer 6 containing the cleavable substance 2 and the binder 4, and the mounting surface 6 a is set at a predetermined inclination angle.
- the article 8 is slid down together with the cleaved substance 3 which is a part of the cleavable substance 2.
- the article 8 can be easily moved without adhering to and remaining on the mounting surface 6a.
- the coating layer 6 is formed on the surface of the base member 7.
- the placing surface 6a may be inclined after the article 8 is placed, or may be inclined in advance, and the article 8 may be placed on the inclined placing surface 6a.
- the inclination angle ⁇ is arbitrary, and is adjusted to an angle at which the article 8 can slide down according to the composition of the coating layer 6, the surface condition of the mounting surface 6a, and the material, shape, mass, and water content of the article 8. Is done.
- the inclination angle ⁇ is 1 to 90 °, may be 5 to 80 °, or may be 10 to 60 °.
- the water content of the article 8 is not particularly limited, but may be 0 to 50% by mass, 1 to 40% by mass, or 15 to 35% by mass. Usually, the lower the moisture content, the easier the movement of the article 8 is, and the higher the moisture content, the easier it is for the article 8 to adhere to the mounting surface 6a. However, according to the moving method of this embodiment, Even in a state where the moisture content is most likely to adhere to the mounting surface 6a, the cleaving substance 2 existing on the mounting surface 6a can be easily slid down.
- the moisture content of the article 8 can be determined from a change in mass before and after heating when the article 8 is heated and dried at 120 ° C. or more for 1 hour or more.
- the pressure may be 1 kPa or more, or 3 kPa or more.
- the coating layer 6 can be formed on an arbitrary member (base member 7).
- the coating layer 6 can be formed on a surface of a bed of a vehicle, an inclined surface of a transport chute, or the like.
- the coating layer 6 can be formed using a coating composition.
- the coating composition will be described.
- the coating composition contains at least a cleavable substance and a solvent.
- the coating composition may further include a binder, if necessary.
- the coating composition may further include an inorganic filler, a pH adjuster, an elastomer, a wetting agent, and other various additives as necessary.
- each component will be described.
- the cleavable substance is not particularly limited as long as it has a cleavable property.
- the term "cleavability" means a property in which grains which are bonded with a weak bonding force between crystal planes and overlap in a layer form are easily broken along the crystal plane.
- the cleavable substance include graphite, mica, talc, hexagonal boron nitride (h-BN), molybdenum sulfide, and the like. Among them, graphite is preferable because it is easily cleaved even with low stress and the article can be more easily moved.
- the graphite is not particularly limited, and natural graphite or synthetic graphite can be used.
- natural graphite include flake graphite, aggregated graphite, and the like. Among these, flaky graphite is preferred because the article can be more easily moved.
- the average particle size of the cleaving substance is not particularly limited, but is preferably 0.1 to 50 ⁇ m, more preferably 1 to 20 ⁇ m, and further preferably 2 to 15 ⁇ m.
- the average particle size of the cleavable substance is 0.1 ⁇ m or more, the cleavable substance particles oriented parallel to the plane direction of the coating layer 6 are easily cleaved (shear separation between crystal layers), and the article 8 can be more easily formed.
- the thickness is 50 ⁇ m or less, the occurrence of irregularities on the surface of the coating layer 6 that hinders the movement of the article 8 tends to be suppressed.
- the average particle size of the cleavable substance can be measured by a general particle size distribution measurement method, for example, a laser diffraction scattering method, an image analysis method, or the like.
- the content of the cleavable substance in the coating composition is preferably 50% by mass or more, more preferably 60 to 98% by mass, and more preferably 80 to 95% by mass, based on the total solid content of the coating composition. Is more preferable.
- the content of the cleavable substance is 50% by mass or more, the slipperiness of the surface of the mounting surface 6a tends to be further improved.
- the content is 98% by mass or less, the amount of binder resin sufficient for forming the coating layer 6 is used. , And there is a tendency that practically sufficient coating strength is easily maintained.
- the preferred range of the content of the cleavable substance based on the total amount of the coating layer 6 in the coating layer 6 is the same as described above.
- the binder is not particularly limited, and for example, a water-soluble resin, an emulsion resin, or the like can be used. Among these, it is preferable to use a water-soluble resin because water is easily used as a solvent.
- the binder By using the binder, the solid content such as the cleavable substance contained in the coating composition can be bound, and the adhesive strength between the formed coating layer 6 and the underlying member can be improved.
- water-soluble resin examples include celluloses such as carboxymethylcellulose and methylcellulose; polyvinyl alcohol; polycarboxylic acids such as polyacrylic acid; polyacrylamide; and poly (alkylene oxide) such as poly (ethylene oxide).
- carboxymethylcellulose particularly ammonium carboxymethylcellulose, is preferred from the viewpoint of dispersing solids such as a cleavable substance in a water-containing solvent and preventing re-dissolution in water after coating is dried.
- the water-soluble resin When a water-soluble resin is used as the binder, the water-soluble resin preferably has a 1% viscosity at 25 ° C. (the viscosity of an aqueous solution obtained by dissolving the water-soluble resin in 1% by mass in water) of 1 to 300 mPa ⁇ s, preferably 10 to 300 mPa ⁇ s. More preferably, it is 50 mPa ⁇ s.
- the 1% viscosity is 1 mPa ⁇ s or more, the resin tends to easily adhere to solid particles such as a cleavable substance and an inorganic filler and function as a binder, and when the viscosity is 300 mPa ⁇ s or less, the coating composition is used.
- the 1% viscosity can be measured using a general rotational viscometer, for example, a B-type viscometer.
- a B-type viscometer manufactured by Tokimec Co., Ltd. This is a value measured at 60 rpm.
- the content is preferably 2 to 40% by mass, more preferably 2 to 20% by mass, based on the total solid content of the coating composition. More preferably, it is ⁇ 15% by mass.
- the content of the binder is 2% by mass or more, a sufficient amount of the binder resin for forming the coating layer 6 can be secured, and there is a tendency that practically sufficient coating strength is easily maintained. There is a tendency that the slipperiness of the surface of the mounting surface 6a can be further improved.
- the preferred range of the content of the binder in the coating layer 6 based on the total amount of the coating layer 6 is the same as described above.
- the solvent is not particularly limited, but when a cleavable substance can be dispersed and a binder is used, it is preferable to use a solvent that can dissolve the binder.
- the solvent include water, alcohol, ketone and the like.
- the alcohol include ethanol, methanol, isopropyl alcohol, and butanol.
- the ketone include acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, and the like.
- the solvent is preferably a polar solvent from the viewpoint of dispersing and dissolving the water-soluble resin.
- the solvent preferably contains water from the viewpoint of reducing the risk of ignition and the like, suppressing the environmental impact, and the ease of handling such as transportation and storage, and achieves both the solubility of the resin and the quick drying property. It is more preferable to include water and alcohol from the viewpoint of.
- the boiling point of the solvent is preferably from 50 to 100 ° C, more preferably from 70 to 90 ° C.
- the solvent can be suppressed from being volatilized when the coating composition is applied, and the working efficiency tends to be improved. , There is a tendency that the solvent can be removed in a shorter time.
- the content of the solvent in the coating composition is preferably from 5 to 90% by mass, more preferably from 50 to 90% by mass, and more preferably from 70 to 85% by mass, based on the total amount of the coating composition. More preferred.
- the content of the solvent in the coating composition can be appropriately adjusted depending on the application method in the coating step so that the coating composition has a desired viscosity.
- the viscosity of the coating composition is preferably adjusted to 0.01 to 3 Pa ⁇ s, more preferably to 0.04 to 0.5 Pa ⁇ s. preferable.
- the viscosity of the coating composition is preferably adjusted to 0.1 to 5 Pa ⁇ s, more preferably 0.3 to 3 Pa ⁇ s. Is more preferable.
- the viscosity of the coating composition is preferably adjusted to 0.2 to 2 Pa ⁇ s, and 0.4 to 1 Pa ⁇ s. It is more preferable to adjust to.
- inorganic filler examples include carbon black, silica, calcium carbonate, aluminum oxide, titanium oxide, chromium oxide, iron oxide, phosphate, and molybdate.
- examples of the silica include colloidal silica from the viewpoint of dispersibility and viscosity adjustment.
- the average particle size of the inorganic filler is not particularly limited, but is preferably 0.01 to 10 ⁇ m, and more preferably 0.03 to 5 ⁇ m.
- the average particle size of the inorganic filler can be measured by a general particle size distribution measuring method, for example, a laser diffraction scattering method, an image analysis method, a dynamic light scattering (DLS) method, or the like.
- the content is preferably 1 to 40% by mass, more preferably 2 to 25% by mass, based on the total solid content of the coating composition.
- the content of the inorganic filler is 1% by mass or more, the viscosity of the coating composition tends to increase, and when the content is 40% by mass or less, an increase in surface roughness of the coating layer and a decrease in slipperiness are suppressed.
- the preferred range of the content of the inorganic filler in the coating layer 6 based on the total amount of the coating layer 6 is the same as described above.
- pH adjuster examples include aqueous ammonia and silicate. Among these, it is preferable to use aqueous ammonia because it is easy to remove the system from the system by volatilization in the coating drying process.
- a pH adjuster By using a pH adjuster, preservability and dispersion stability of a solid component can be imparted to the coating composition.
- the content is preferably from 0.02 to 2% by mass, more preferably from 0.05 to 1% by mass, based on the total amount of the coating composition. More preferably, it is 0.1 to 0.5% by mass.
- the content of the pH adjuster is 0.02% by mass or more, dispersion stability and antiseptic properties tend to be stably provided, and when the content is 2% by mass or less, the pH adjustment excessively remaining in the coating. There is a tendency that the decrease in durability of the coating due to the agent can be suppressed.
- elastomer examples include styrene butadiene rubber, silicone rubber, and acrylic rubber. Among these, styrene-butadiene rubber is preferably used from the viewpoint of dispersibility in the coating composition. By using an elastomer, the film strength of the coating can be improved.
- the content is preferably 0.5 to 15% by mass, more preferably 1 to 10% by mass, based on the total solid content of the coating composition. And more preferably 2 to 8% by mass.
- the content of the elastomer is 0.5% by mass or more, the film strength of the coating layer 6 tends to be improved, and when the content is 15% by mass or less, a decrease in the slipperiness of the coating layer 6 tends to be suppressed.
- the preferred range of the content of the elastomer based on the total amount of the coating layer 6 in the coating layer 6 is the same as described above.
- wetting agent examples include a nonionic surfactant, an anionic surfactant, and a cationic surfactant.
- nonionic surfactant examples include an acetylene glycol-based surfactant, an ethylene glycol-added acetylene glycol-based surfactant, and a silicone-based dispersant.
- cationic surfactant examples include quaternary ammonium salts and alkylamine salts.
- anionic surfactant examples include carboxylate salts, sulfonate salts, sulfate esters, and phosphate esters.
- a nonionic surfactant from the viewpoint of low interaction with other water-soluble components and suppression of foaming.
- the content is preferably 0.01 to 1% by mass, and more preferably 0.05 to 0.5% by mass, based on the total amount of the coating composition. More preferably, it is even more preferably 0.1 to 0.3% by mass.
- the content of the wetting agent is 0.01% by mass or more, the effect of improving the wettability tends to be obtained stably, and when the content is 1% by mass or less, the generation of bubbles becomes remarkable due to excessive addition. It tends to be suppressed. In addition, even if the wetting agent is further increased beyond 1% by mass, the wettability tends to be hardly improved further.
- the coating composition may further contain other additives other than the above-described components.
- Other additives include a plasticizer, a dispersant, a thickener, an antisettling agent, an antifoaming agent, an anti-sagging agent, a leveling agent, a rust inhibitor, a water repellent, and the like.
- FIG. 2 is a schematic view showing one embodiment of a coating method in the case of forming a coating layer using the coating composition.
- FIG. 2 shows a method of coating the surface of a bed of a vehicle carrying ore by spray coating.
- the coating method shown in FIG. 2 first, as shown in FIG. 2A, spray coating using an air spray 22 is performed on at least a part of the surface of the bed 12 of the dump truck 10 for transporting the ore. Thereby, the coating composition containing the cleavable substance and the solvent is applied to form the coating film 14 (coating step).
- the solvent is removed from the coating film 14 by heating and drying using a heating lamp 24 (drying step). As a result, the solvent is removed from the coating film 14, and the coating layer 6 containing a cleavable substance is formed as shown in FIG.
- the dump truck 10 is moved in a predetermined direction with respect to the air spray 22 or the heating lamp 24, or the air spray 22 or the heating lamp 24 is moved in a predetermined direction with respect to the dump truck 10.
- the coating layer 6 may be formed at a desired position on the carrier 12.
- the coating layer 6 may be formed, for example, on the entire inner wall surface of the carrier 12.
- the coating layer 6 can also be formed on the side wall surface of the carrier 12 not shown in FIG.
- the mined ore is loaded on the bed 12 of the dump truck 10 on which the coating layer 6 is formed, and the ore is transported to a predetermined place such as an accumulation place. The ore will slide down from 12.
- the ore since the coating layer 6 is formed on the surface of the bed 12, the ore can be easily slid down, and the unloading of the ore on the bed 12 can be suppressed.
- the “ore” in the present disclosure is not limited to the ore in the mined state, but also includes, for example, the ore that has been mined, transported, and subjected to processing such as sorting and purification.
- the coating step is performed by coating at least a part of the surface of the carrier 12 with the coating composition.
- a coating method in addition to the method of applying by spraying as shown in FIG. 2A, a method of applying by hand using a brush or a brush, or a coating machine such as a bar coater or a roll coater. And a method of application using the same.
- a method of applying by spray coating is preferable because coating can be performed efficiently and uniformly in a short time.
- These coating methods may be used in combination of two or more types.
- the coating film 14 made of the coating composition can be formed on at least a part of the surface of the carrier 12.
- drying process Since the coating film 14 formed in the coating step contains a solvent, the solvent is removed from the coating film 14 by performing a drying step, and the coating layer 6 is formed.
- a method for removing the solvent in addition to the method of heating and drying using the heating lamp 24 shown in FIG. 2B, a method of blowing air using a blower to blow air on the coating film 14, and leaving the coating film at room temperature. And a method of heating a base (object to be coated) from below, and a method of irradiating light with sunlight or a floodlight.
- a method including heating and / or blowing is preferable because the solvent in the coating film 14 is easily and efficiently removed sufficiently in a short time.
- These drying methods may be used in combination of two or more types.
- the heating temperature in the case of performing the heat drying is preferably 30 to 180 ° C, more preferably 80 to 150 ° C.
- the heating temperature is preferably 30 to 180 ° C, more preferably 80 to 150 ° C.
- the drying time in the drying step may be 20 minutes or less. In order to shorten the drying time, it is preferable to perform drying using a unit including heating and / or blowing, more preferably to perform drying using a unit including heating, and a unit including both heating and blowing. It is more preferable to perform drying using
- the drying time may be 0.2 hours or more, or may be 0.2 to 1 hour.
- the thickness of the coating layer 6 formed through the drying step is preferably 5 to 300 ⁇ m, more preferably 10 to 100 ⁇ m.
- the drying step can be shortened, the coating layer 6 having a smoother surface can be formed, and the increase in the mass of the carrier 12 and the decrease in the capacity of the carrier 12 tend to be suppressed.
- the weight per unit area of the coating layer 6 formed through the drying step is preferably 7.5 to 600 g / m 2 , and more preferably 15 to 200 g / m 2 .
- the mass per unit area is 15 g / m 2 or more, the ore can be more easily slid off the carrier 12, and the effect tends to be maintained for a longer period, and 200 g / m 2.
- the coating step and the drying step can be performed in a shorter time, the coating layer 6 having a smoother surface can be formed, and an increase in the mass of the carrier 12 and a decrease in the capacity of the carrier 12 can be suppressed. Tend to be able to.
- the coating method according to the present embodiment may further include a polishing step of polishing the surface of the coating layer 6 formed through the drying step. Polishing can be performed with a natural fiber or synthetic fiber cloth, feather cloth, brush, sponge, or the like. By polishing the surface of the coating layer 6, the surface can be made smoother, and the ore can be more easily slid off the carrier 12.
- first coating layer At least a part of the surface of the formed coating layer (hereinafter, referred to as “first coating layer”) is coated with a cleavable substance and a solvent.
- the method may further include a second coating step of coating with the contained second coating composition, and a second drying step of removing the solvent in the second coating composition.
- the second coating step and the second drying step may be performed by the same method as the coating step and the drying step when forming the first coating layer, or may be performed by different methods. Further, as the second coating composition, the same composition as the coating composition for forming the first coating layer may be used, or a different composition may be used.
- a second coating layer can be formed on the first coating layer, so that a thicker coating layer is formed on a smoother surface. It can be formed in a state of having.
- durability and impact resistance can be further improved.
- the carrier may be coated again by the coating method according to the present embodiment. Further, the coating of the bed by the coating method according to the present embodiment may be repeated every 12 hours to 14 days. In this way, by performing coating at intervals of 12 hours to 14 days, it is possible to continuously maintain excellent slipperiness of the cargo bed surface. In this manner, by regularly performing coating at regular intervals, the maintenance of the carrier becomes easy.
- the coating method according to the present embodiment can be performed in a short time and at low cost as compared with the case of using a liner, and even if a coating layer formed in the past remains, it is overcoated on the coating layer. Since a layer can be formed, periodic coating can be easily performed. Before performing the coating again, the surface of the coating layer formed in the past may be washed and / or polished.
- the coating layer is black, which is different from the color of the surface of the bed before forming the coating layer. Therefore, the coating may be performed again at the timing when the color of the coating layer becomes faint and the color of the surface of the loading platform starts to be seen. In this manner, the maintenance time can be determined based on the color, which facilitates the maintenance of the carrier.
- the coating method according to the present embodiment can be performed on a carrier having damage such as scratches or abrasion on the surface, so that a smooth coating layer can be formed in a state where the damage is covered. It can be used as a repairing method or a method for flattening the surface of a carrier. In the case where the above-mentioned damage has occurred on the surface of the carrier, the surface is in an uneven state. Therefore, when the ore is transported as it is, a large amount of unloading occurs. Also, it is not easy to install the liner on the uneven surface of the carrier.
- the coating method according to the present embodiment can be easily performed even on a bed having such damage, and can be an epoch-making method that enables the bed to be repaired and reused.
- the vehicle that performs the coating method according to the present embodiment is a vehicle provided with a bed for loading ore, and examples thereof include trucks such as dump trucks, freight trains, wheelbarrows, electric carriers, and motorized vehicles. Cars, trucks with crawlers, and the like.
- trucks such as dump trucks, freight trains, wheelbarrows, electric carriers, and motorized vehicles. Cars, trucks with crawlers, and the like.
- the coating method according to the present embodiment is a method of applying and coating a coating composition, it can be applied to a bed having any shape. Therefore, the shape of the loading platform is not limited at all, and may be any shape such as a flat plate shape, a rectangular shape, a lower opening type, an upper opening type, a scoop end type, a bucket, and a belt conveyor.
- the method for transporting ore according to the present embodiment includes forming a coating layer containing a cleavable substance on at least a part of the surface of a bed of a vehicle for transporting ore, and loading and transporting the ore on the bed.
- the ore slides down together with a part of the cleavable material by inclining the carrier at the destination and cleaving a part of the cleavable material in contact with the ore.
- Examples of ores to be transported include iron ore, copper ore, other base metal ores, coal, oil shale, and the like.
- the ore may contain impurities such as clay and earth and sand.
- the ore may include iron ore and clay.
- the ore loaded on the bed of the vehicle is not shaken while being transported, and when the bed is inclined at the destination, the ore piled up is collapsed.
- the cleavable material is cleaved on the surface of the carrier, and the ore can be easily slid off. Therefore, carryback of the ore can be effectively prevented.
- the load causes the cleavage material to be cleaved and adhered. The amount of carryback can be limited because the ore can be slid down.
- the cleavable substance does not cleave when the article slightly adheres to the mounting surface, and it can be cleaved and slipped off after the amount of attachment increases to some extent. Unnecessary wear can be suppressed, and high durability can be obtained. Further, by adjusting the composition of the coating layer, it is possible to adjust the stress that causes cleavage of the cleavable substance.
- the coating method, the maintenance method, and the method of repairing and flattening the bed surface described above the case where the coating layer is formed on the bed of the vehicle that transports the ore has been described.
- the maintenance method and the method for repairing and flattening the surface can be applied to other than the vehicle bed.
- Target objects that can be applied to other than the vehicle bed include a transport chute and a conveyor used for transporting articles.
- the above-described coating method, maintenance method, and method of repairing and planarizing the surface of the object can be applied to these objects.
- the transport chute can be used for the movement of the ore similarly to the above-described vehicle bed, the same effect as when the method of the present disclosure is applied to the bed can be achieved.
- the articles include coke, rock, earth and sand, gravel, and other wastes in addition to ores.
- the present disclosure in a state where the mounting surface provided with a coating layer containing a cleavable substance is inclined, ore on the mounting surface described above, and a part of the cleavable material in contact with the ore is cleaved.
- a method for transporting ore comprising a step of sliding down together with a part of the cleavable material, and a device for transporting ore having a mounting surface provided with a coating layer containing a cleavable material,
- the ore on the mounting surface described above slides down along with a part of the cleavable material by cleaving a part of the cleavable material in contact with the ore.
- a surface, ore transporter may also be provided.
- the various modes described in the above-described preferred embodiments can be applied to the ore transport method and the ore transport device. Examples of the ore transport device include a vehicle, a transport chute, and a conveyor.
- Example 1 Preparation of coating composition 1 part by mass of carboxymethyl cellulose (trade name: DN-10L, manufactured by Daicel Finechem Co., Ltd.) as a water-soluble resin, 3 parts by mass of carbon black having an average particle size of 0.04 ⁇ m as an inorganic filler, and an average particle size as graphite 8 parts by mass of 5 ⁇ m flaky graphite powder (natural graphite particles, trade name: HSP, manufactured by Chuetsu Graphite Industry Co., Ltd.), 49.2 parts by mass of water as a solvent, and 0.1 part of ammonia water as a pH adjuster.
- carboxymethyl cellulose trade name: DN-10L, manufactured by Daicel Finechem Co., Ltd.
- carbon black having an average particle size of 0.04 ⁇ m as an inorganic filler
- graphite 8 parts by mass of 5 ⁇ m flaky graphite powder naturally graphite particles, trade name: HSP, manufactured by Chuetsu Graphite Industry Co.,
- a coating test piece was prepared by the following method.
- the coating composition was applied to one surface of an iron plate having a length of 130 mm, a width of 130 mm, and a thickness of 5 mm using an air spray, and dried by heating at 150 ° C. for 15 minutes.
- a coating test piece having a coating layer formed on an iron plate was obtained.
- the thickness of the coating layer was 50 ⁇ m, and the weight of the coating layer per unit area was 100 g / m 2 .
- the surface of the coating test piece on the coating layer side is defined as a mounting surface.
- Example 2 Preparation of coating composition 1 part by mass of carboxymethyl cellulose (trade name: DN-10L, manufactured by Daicel Finechem Co., Ltd.) as a water-soluble resin, and flaky graphite powder having an average particle size of 5 ⁇ m as graphite (natural graphite particles, trade name: HSP, stock) 18.5 parts by mass (manufactured by Chuetsu Graphite Industry Co., Ltd.), 80.0 parts by mass of water as a solvent, and 0.3 parts by mass of aqueous ammonia as a pH adjuster were mixed by stirring to obtain a base solution.
- carboxymethyl cellulose trade name: DN-10L, manufactured by Daicel Finechem Co., Ltd.
- Example 2 (Preparation of coating test piece) In the same manner as in Example 1, the coating composition of Example 2 was applied to an iron plate and dried to obtain a coating test piece. In the obtained coating test piece, the thickness of the coating layer was 50 ⁇ m, and the weight of the coating layer per unit area was 100 g / m 2 .
- Comparative Example 2 A metal plate (SS400, rotary polished finish) was prepared as a coating test piece of Comparative Example 2. This test piece assumes the material of the truck bed.
- FIG. 3 is a schematic diagram for explaining the test method of the shoot test.
- a cylinder 72 having an inner diameter of 70 mm ⁇ and a height of 30 mm was arranged on the mounting surface 40 a of the coating test piece 70, and the sample soil 60 was filled inside the cylinder 72.
- the sample soil 60 is composed of 40 parts by mass of horticultural soil (trade name: Akadamado, manufactured by Daiso Sangyo Co., Ltd.), and 60 parts by mass of iron oxide powder (trade name: red handle, manufactured by Asaoka Ceramics Co., Ltd.) Water is mixed to adjust the water content to 23% by mass. Akadama was ground using a mortar and pestle and then mixed.
- a piston 74 having an outer diameter equivalent to the inner diameter of the cylinder 72 was placed on the sample soil 60, and a weight 80 was further placed thereon via a support plate 76. .
- a stress of 50 kPa was applied to the sample soil 60 for one minute.
- a small weight 90 was placed on the piston 74 as shown in FIG. By changing the mass of the weight 90, a stress of 3 kPa or 5 kPa was applied to the sample soil 60.
- FIG. 3B a piston 74 having an outer diameter equivalent to the inner diameter of the cylinder 72 was placed on the sample soil 60, and a weight 80 was further placed thereon via a support plate 76.
- a stress of 50 kPa was applied to the sample soil 60 for one minute.
- a small weight 90 was placed on the piston 74 as shown in FIG.
- a stress of 3 kPa or 5 kPa was applied to the sample soil 60.
- the mounting surface 40a was inclined at a rate of 1 ° / sec under a stress, and the inclination angle ⁇ when the cylinder 72 started to slide was measured.
- Table 1 shows the results. After the shoot test was performed using the coated test pieces of Examples 1 and 2, when the surface of the sample soil 60 that was in contact with the mounting surface was observed, the adhesion of graphite was confirmed. In Comparative Example 1, even when the stress was increased from 3 kPa to 5 kPa, the inclination angle at which the slide started was not significantly reduced. In Comparative Example 2, since the inclination angle was high, the cylinder fell without slipping.
- Example 3 A coating composition and a coating test piece were obtained in the same manner as in Example 1 except that the components shown in Table 2 were blended in the blending amounts (unit: parts by mass) shown in the same table.
- aggregate graphite powder naturally graphite particles
- flaky graphite powder having an average particle size of 5 ⁇ m.
- the thickness of the coating layer was 20 ⁇ m, and the weight of the coating layer per unit area was 25 g / m 2 .
- Example 6 and 7 A coating composition was obtained in the same manner as in Example 1 except that the components shown in Table 2 were blended in the blending amounts (unit: parts by mass) shown in the same table. Using the obtained coating composition, a coating test piece was prepared by the following method. The coating composition was applied to one surface of an iron plate having a length of 130 mm, a width of 130 mm, and a thickness of 5 mm using a brush, and was allowed to dry at room temperature (25 ° C.) for 1 hour. Thus, a coating test piece having a coating layer formed on an iron plate was obtained. In the coating test pieces of Examples 6 to 7, the thickness of the coating layer was 22 ⁇ m, and the weight of the coating layer per unit area was 35 g / m 2 .
- Example 8 A coating composition was obtained in the same manner as in Example 1 except that the components shown in Table 2 were blended in the blending amounts (unit: parts by mass) shown in the same table. Using the obtained coating composition, a coating test piece was prepared by the following method. The coating composition was applied to one side of an iron plate having a length of 130 mm, a width of 130 mm and a thickness of 5 mm using a bar coater with a gap of 50 ⁇ m, and dried at room temperature (25 ° C.) for 1 hour. Thus, a coating test piece having a coating layer formed on an iron plate was obtained. In the obtained coating test piece, the thickness of the coating layer was 25 ⁇ m, and the weight of the coating layer per unit area was 40 g / m 2 .
- FIG. 4 is a schematic diagram for explaining a method of evaluating slipperiness.
- a metal-made circular dish 31 having a diameter (inner diameter of an opening) of 45 mm and a flat bottom is placed on a clay for pottery (trade name: Toshikoshi, Joyful Hyundai Co., Ltd.). 33) and the surface was flattened with a spatula made of polyethylene.
- the circular dish 31 filled with the clay 33 was adhered to the upper surface of a weight 37 having a hook 39 on a side surface using a double-sided tape 35.
- the movable weight 30 having the smooth surface of the clay 33 was obtained.
- the mass M of the movable weight 30 was 1.7 kg.
- the water content of the clay 33 was 23% by mass.
- the movable weight 30 was placed on the coating test piece 40 fixed on a horizontal table 42 with the smooth surface of the clay 33 facing down.
- the coating test piece 40 of the example was arranged such that the surface on the coating layer side was in contact with the movable weight 30.
- a table tester (trade name: small desk tester FGS-50TV, manufactured by Nidec-Shimpo Corporation) 50 capable of driving a force gauge (push-pull gauge) 52 up and down at a constant speed is set on the same table 42.
- the hook 39 on the side surface of the movable weight 30 and the tip of the force gauge 52 were connected by a stainless wire 44 via a pulley 46 installed immediately below the force gauge 52.
- the tension T applied to the force gauge 52 was recorded while raising the force gauge 52 at a constant speed.
- the moving speed of the force gauge 52 was set to 60 mm / min.
- the surface stress in the direction perpendicular to the friction surface which was obtained by dividing the mass M of the movable weight 30 by the contact area between the clay 33 and the coating test piece 40, was 11 kPa.
- FIG. 5 schematically shows the time change of the frictional force f.
- the initial peak value of the frictional force f over time is the static frictional force f 0
- the friction coefficient at that time is the static frictional coefficient ⁇ 0
- the average value at which the frictional force becomes constant is the dynamic frictional force.
- f ′, and the friction coefficient at that time was defined as dynamic friction coefficient ⁇ ′.
- the coated test piece of Example 1 showed a slightly higher, but almost the same level of the coefficient of kinetic friction on the clay surface, and a significantly lower static friction coefficient than the coated test piece of Comparative Example 1.
- the coated test piece of Example 1 had equal or higher slipperiness than the polyethylene plate. That is, comparing the surface of the polyethylene plate with the surface of the coating test piece of Example 1, when the object containing clay was left on the surface and the surface was inclined from horizontal, the coating test piece of Example 1 Since the coefficient of static friction is clearly lower on the surface, the object starts to slide down easily, and the coefficient of kinetic friction is equivalent. Therefore, it is considered that the object that has started to slide has the same difficulty in stopping.
- the coating test pieces of Examples 3 to 8 showed almost the same level of kinetic friction coefficient on the clay surface as those of the coating test pieces of Comparative Example 1 as in Example 1, and showed the static friction. The coefficients clearly showed low values.
- the coating compositions of Examples 1 to 8 can be applied using an air spray, a brush, or a bar coater, and dried to form a coating layer on a metal surface. With a simple method, it is possible to form a carrier, a transport chute, and the like that can suppress the ore unloading.
- a moving method capable of easily moving various articles placed on a mounting surface while suppressing remaining on the mounting surface.
- This moving method can be suitably used, for example, when the ore loaded on the bed of a vehicle such as a truck is unloaded from the bed at the accumulation place, or when the ore is moved by the transport chute at the accumulation place or the like. Further, the above-described moving method can be used when moving various articles other than ore on the mounting surface.
- the present disclosure when ore is loaded and transported on a bed of a vehicle such as a truck at a mining site, and when the ore is unloaded from the bed at an accumulation location, it is possible to suppress the unloading of the ore on the bed. And a method for transporting ore that can be provided. Further, according to the present disclosure, it is possible to provide an ore transport method and an ore transport device that can suppress ore adhesion to a mounting surface.
- a loading method and a coating composition for a loading platform applicable to the moving method and the transporting method and a method for improving the slipperiness of the loading platform, a repairing method for the loading platform, and a flatness of the loading platform utilizing the above-described coating method.
- a maintenance method for the carrier for the carrier.
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Abstract
Description
本実施形態に係る物品の移動方法は、載置面上の物品を移動させる方法であって、上記載置面が劈開性物質を含むコーティング層を備え、上記載置面を傾斜させ、上記物品と接する上記劈開性物質の一部を劈開させることにより、上記物品を上記劈開性物質の一部と共に滑り落とす方法である。
コーティング組成物は、少なくとも劈開性物質と溶剤とを含有する。コーティング組成物は、必要に応じて、バインダーを更に含んでいてもよい。コーティング組成物は、必要に応じて、無機フィラー、pH調整剤、エラストマー、及び、濡れ剤、並びに、その他の各種添加剤を更に含んでいてもよい。以下、各成分について説明する。
劈開性物質としては、劈開性を有する物質であれば特に限定されない。ここで、劈開性とは、結晶面間が弱い結合力で結合して層状に重なり合った粒子が、結晶面に沿って割れやすい性質を意味する。劈開性物質としては、例えば、黒鉛、雲母、タルク、六方晶窒化ホウ素(h-BN)、硫化モリブデン等が挙げられる。これらの中でも、低い応力でも劈開し易く、物品をより容易に移動させることができることから、黒鉛が好ましい。
バインダーとしては特に限定されないが、例えば、水溶性樹脂、エマルジョン樹脂等を用いることができる。これらの中でも、溶剤として水を使用し易いことから、水溶性樹脂を用いることが好ましい。バインダーを用いることで、コーティング組成物に含まれる劈開性物質等の固形分を結着させることができると共に、形成されたコーティング層6とその下地の部材との接着力を向上させることができる。
溶剤としては特に限定されないが、劈開性物質を分散可能であり、且つ、バインダーを用いる場合には当該バインダーを溶解可能なものを用いることが好ましい。溶剤としては、例えば、水、アルコール、ケトン等が挙げられる。アルコールとしては、エタノール、メタノール、イソプロピルアルコール、ブタノール等が挙げられる。ケトンとしては、アセトン、メチルエチルケトン、メチルイソブチルケトン、シクロヘキサノン等が挙げられる。溶剤は、水溶性樹脂を分散、溶解する観点から、極性溶媒であることが好ましい。これらの中でも、溶剤は、発火等の危険性の低減、環境影響の抑制、並びに、運搬及び保管等の取扱い容易性の観点から、水を含むことが好ましく、樹脂の溶解性と速乾性の両立の観点から水とアルコールとを含むことがより好ましい。
無機フィラーとしては、カーボンブラック、シリカ、炭酸カルシウム、酸化アルミニウム、酸化チタン、酸化クロム、酸化鉄、リン酸塩、モリブデン酸塩等が挙げられる。シリカとしては、分散性、粘度調整の観点からコロイダルシリカが挙げられる。無機フィラーを用いることにより、粘度、塗膜性、コーティングの硬さ及び伸び、並びに、防錆性等の諸特性を調整することができる。
pH調整剤としては、アンモニア水、ケイ酸塩等が挙げられる。これらの中でも、コーティング乾燥過程での揮発による系外への除去が容易であることから、アンモニア水を用いることが好ましい。pH調整剤を用いることにより、コーティング組成物に防腐性、及び、固形成分の分散安定性を付与することができる。
エラストマーとしては、スチレンブタジエンゴム、シリコーンゴム、アクリルゴム等が挙げられる。これらの中でも、コーティング組成物中への分散性の観点から、スチレンブタジエンゴムを用いることが好ましい。エラストマーを用いることにより、コーティングの膜強度を向上させることができる。
濡れ剤としては、ノニオン系界面活性剤、アニオン系界面活性剤、カチオン系界面活性剤等が挙げられる。濡れ剤を用いることにより、金属等の被コーティング材表面への濡れ性を改善し、ヘコミ及びハジキを抑え、良好な塗膜を形成することができる。
コーティング組成物は、上述した各成分以外の他の添加剤を更に含有していてもよい。他の添加剤としては、可塑剤、分散剤、増粘剤、沈降防止剤、消泡剤、タレ防止剤、レベリング剤、防錆剤、撥水剤等が挙げられる。
図2は、上記コーティング組成物を用いてコーティング層を形成する場合のコーティング方法の一実施形態を示す模式図である。図2では、スプレー塗布により、鉱石を運搬する車両の荷台の表面をコーティングする方法を示している。
コーティング工程は、上記コーティング組成物を用いて荷台12の少なくとも一部の表面をコーティングすることで行われる。コーティングの方法としては、図2の(a)に示したスプレー塗布により塗布する方法の他、ハケ又はブラシ等を用いて手塗りにて塗布する方法、バーコーター又はロールコーター等の塗工機を用いて塗布する方法等が挙げられる。これらの中でも、短時間で効率的に、且つ、均一にコーティングを行うことができることから、スプレー塗布により塗布する方法が好ましい。これらの塗布方法は、2種類以上の方法を組み合わせて用いてもよい。
上記コーティング工程で形成された塗膜14には溶剤が含まれているため、乾燥工程を行うことにより塗膜14から溶剤を除去し、コーティング層6を形成する。溶剤の除去方法としては、図2の(b)に示した加熱ランプ24を用いて加熱乾燥する方法の他、送風機を用いて送風することにより塗膜14に空気を吹き付ける方法、常温で放置して自然乾燥させる方法、下部から下地(被塗装物)を加熱する方法、及び、太陽光や投光器により光照射する方法等が挙げられる。これらの中でも、短時間で効率的に且つ十分に塗膜14中の溶剤を除去し易いことから、加熱及び/又は送風を含む方法が好ましい。これらの乾燥方法は、2種類以上の方法を組み合わせて用いてもよい。
本実施形態に係るコーティング方法は、乾燥工程を経て形成されたコーティング層6の表面を研磨する研磨工程を更に含んでいてもよい。研磨は、天然繊維もしくは合成繊維の布地、羽布、ブラシ、スポンジ等により行うことができる。コーティング層6の表面を研磨することで、表面をより平滑化し、荷台12から鉱石をより容易に滑り落とすことが可能となる。
本実施形態に係るコーティング方法は、上記乾燥工程後又は上記研磨工程後に、形成されたコーティング層(以下、「第1のコーティング層」という)の少なくとも一部の表面を、劈開性物質及び溶剤を含有する第2のコーティング組成物によりコーティングする第2のコーティング工程と、第2のコーティング組成物中の上記溶剤を除去する第2の乾燥工程と、を更に有していてもよい。
本実施形態に係るコーティング方法により荷台のコーティングを行った後、12時間~14日間経過後に、本実施形態に係るコーティング方法により荷台のコーティングを再度行ってもよい。また、本実施形態に係るコーティング方法による荷台のコーティングは、12時間~14日間毎に繰り返し行ってもよい。このように、12時間~14日間の間隔でコーティングを行うことで、荷台表面の優れた滑り性を継続的に維持することができる。このように一定期間毎に定期的にコーティングを行うことで、荷台のメンテナンスが容易となる。本実施形態に係るコーティング方法は、ライナーを用いる場合と比較して、短時間且つ低コストで実施することができると共に、過去に形成したコーティング層が残っていても、その上に上塗りしてコーティング層を形成することができるため、定期的なコーティングを容易に行うことができる。なお、再度のコーティングを行う前に、過去に形成したコーティング層表面の洗浄及び/又は研磨等を行ってもよい。
本実施形態に係るコーティング方法は、表面に傷又は摩耗等の損傷がある荷台に対して実施することで、上記損傷を覆った状態で平滑なコーティング層を形成することができるため、荷台表面の修復方法又は荷台表面の平坦化方法として活用することができる。荷台表面に上記損傷があった場合、当該表面は凹凸が生じた状態となっているため、そのまま鉱石の運搬を行った場合、積み残しが多く生じることとなる。また、凹凸のある荷台表面にライナーを設置することも容易ではない。本実施形態に係るコーティング方法は、そのような損傷のある荷台に対しても容易に実施することができ、当該荷台を修復して再活用することを可能とする画期的な方法となり得る。
本実施形態に係るコーティング方法を行う車両は、鉱石を積載するための荷台を備えた車両であり、その例としては、ダンプトラック等のトラック、貨物列車、手押し車、電動運搬車、原動機付き運搬車、クローラ付き運搬車等が挙げられる。また、本実施形態に係るコーティング方法は、コーティング組成物を塗布してコーティングする方法であるため、どのような形状を有する荷台に対しても実施することができる。そのため、荷台の形状は何ら限定されず、平板状、矩形状、下開き型、上開き型、スクープエンド型、バケット、ベルトコンベア等のいずれの形状であってもよい。
本実施形態に係る鉱石の運搬方法は、鉱石を運搬するための車両の荷台の少なくとも一部の表面に、劈開性物質を含むコーティング層を形成し、当該荷台に鉱石を積載して運搬した後、運搬先で荷台を傾斜させ、鉱石と接する劈開性物質の一部を劈開させることにより、鉱石を上記劈開性物質の一部と共に滑り落とす方法である。
(コーティング組成物の調製)
水溶性樹脂としてのカルボキシメチルセルロース(商品名:DN-10L、ダイセルファインケム株式会社製)1質量部と、無機フィラーとしての平均粒径0.04μmのカーボンブラック3質量部と、黒鉛としての平均粒径5μmのりん片状グラファイト粉末(天然黒鉛粒子、商品名:HSP、株式会社中越黒鉛工業所製)8質量部と、溶剤としての水49.2質量部と、pH調整剤としてのアンモニア水0.2質量部と、エラストマーとしてのスチレンブタジェンゴム(商品名:TRD2001、JSR株式会社製)1質量部と、を攪拌混合してベース溶液を得た。このベース溶液に、濡れ剤としてのアセチレングリコール系分散剤(商品名:Olfine EXP.4200、日信化学工業株式会社製)0.2質量部と、極性溶媒としてのイソプロピルアルコール37.4質量部とを加えて攪拌混合し、コーティング組成物を得た。
得られたコーティング組成物を用いて、コーティング試験片を以下の方法で作製した。縦130mm、横130mm、厚さ5mmの鉄板の片面に、エアスプレーを用いてコーティング組成物を塗布し、150℃で15分間加熱乾燥した。これにより、鉄板上にコーティング層が形成されたコーティング試験片を得た。得られたコーティング試験片において、コーティング層の厚さは50μmであり、単位面積当たりのコーティング層の質量は100g/m2であった。このコーティング試験片のコーティング層側の表面を載置面とする。
(コーティング組成物の調製)
水溶性樹脂としてのカルボキシメチルセルロース(商品名:DN-10L、ダイセルファインケム株式会社製)1質量部と、黒鉛としての平均粒径5μmのりん片状グラファイト粉末(天然黒鉛粒子、商品名:HSP、株式会社中越黒鉛工業所製)18.5質量部と、溶剤としての水80.0質量部と、pH調整剤としてのアンモニア水0.3質量部と、を攪拌混合してベース溶液を得た。このベース溶液に、濡れ剤としてのアセチレングリコール系分散剤(商品名:Olfine EXP.4200、日信化学工業株式会社製)0.2質量部を加えて攪拌混合し、コーティング組成物を得た。
実施例1と同様の方法で、実施例2のコーティング組成物を鉄板に塗布、乾燥し、コーティング試験片を得た。得られたコーティング試験片において、コーティング層の厚さは50μmであり、単位面積当たりのコーティング層の質量は100g/m2であった。
[比較例1]
金属板(SS400、サーフェス研磨仕上げ)上にポリエチレンシート(商品名:クリヤホルダースーパークリヤー10、コクヨ株式会社製)を敷いたものを、比較例1のコーティング試験片として用意した。このコーティング試験片は、トラックライナー用のポリエチレン板を想定したものである。このコーティング試験片のポリエチレンシート側の表面を載置面とする。
金属板(SS400、ロータリー研磨仕上げ)を、比較例2のコーティング試験片として用意した。この試験片は、トラックの荷台の材質を想定したものである。
実施例及び比較例で得られたコーティング試験片について、以下の方法によりシュート試験を行った。ここで、図3はシュート試験の試験方法を説明するための模式図である。まず、図3の(a)に示すように、コーティング試験片70の載置面40a上に、内径70mmφ、高さ30mmのシリンダー72を配置し、シリンダー72の内側にサンプル土壌60を充填した。サンプル土壌60は、園芸用の土壌(商品名:赤玉土、株式会社大創産業製)40質量部と、酸化鉄粉末(商品名:弁柄、浅岡窯業原料株式会社製)60質量部と、水とを混合し、含水率23質量%に調整したものである。赤玉土は、乳鉢と乳棒を使用して粉砕してから混合した。
表2に示す各成分を同表に示す配合量(単位:質量部)で配合したこと以外は実施例1と同様にして、コーティング組成物及びコーティング試験片を得た。なお、実施例5では、黒鉛として、平均粒径5μmのりん片状グラファイト粉末の他に、平均粒径10μmの凝集状グラファイト粉末(天然黒鉛粒子)を用いた。実施例3~5のコーティング試験片において、コーティング層の厚さは20μmであり、単位面積当たりのコーティング層の質量はいずれも25g/m2であった。
表2に示す各成分を同表に示す配合量(単位:質量部)で配合したこと以外は実施例1と同様にして、コーティング組成物を得た。得られたコーティング組成物を用いて、コーティング試験片を以下の方法で作製した。縦130mm、横130mm、厚さ5mmの鉄板の片面に、ハケを用いてコーティング組成物を塗布し、常温(25℃)で1時間放置して乾燥した。これにより、鉄板上にコーティング層が形成されたコーティング試験片を得た。実施例6~7のコーティング試験片において、コーティング層の厚さは22μmであり、単位面積当たりのコーティング層の質量はいずれも35g/m2であった。
表2に示す各成分を同表に示す配合量(単位:質量部)で配合したこと以外は実施例1と同様にして、コーティング組成物を得た。得られたコーティング組成物を用いて、コーティング試験片を以下の方法で作製した。縦130mm、横130mm、厚さ5mmの鉄板の片面に、バーコーターを用いてギャップ50μmでコーティング組成物を塗布し、常温(25℃)で1時間放置して乾燥した。これにより、鉄板上にコーティング層が形成されたコーティング試験片を得た。得られたコーティング試験片において、コーティング層の厚さは25μmであり、単位面積当たりのコーティング層の質量は40g/m2であった。
実施例及び比較例で得られたコーティング試験片について、以下の方法により滑り性を評価した。ここで、図4は滑り性の評価方法を説明するための模式図である。まず、図4の(a)に示すように、直径(開口部の内径)が45mmで底面が平らな金属製の円形皿31に、陶芸用の粘土(商品名:特漉し、株式会社ジョイフル本田製)33を充填し、表面をポリエチレン製のヘラで平らにならした。この粘土33を充填した円形皿31を、側面にフック39を備えた錘37の上面に両面テープ35を用いて貼り付けた。これにより、粘土33の平滑面を有する移動重錘30を得た。この移動重錘30の質量Mは1.7kgであった。粘土33の含水率は23質量%であった。
f=μ・N (1)
Claims (27)
- 載置面上の物品を移動させる方法であって、
前記載置面が劈開性物質を含むコーティング層を備え、
前記載置面を傾斜させ、前記物品と接する前記劈開性物質の一部を劈開させることにより、前記物品を前記劈開性物質の一部と共に滑り落とす、物品の移動方法。 - 前記劈開性物質が黒鉛を含む、請求項1に記載の物品の移動方法。
- 前記コーティング層が更にバインダーを含む、請求項1又は2に記載の物品の移動方法。
- 前記バインダーが水溶性樹脂を含む、請求項3に記載の物品の移動方法。
- 前記載置面を1~90°傾斜させる、請求項1~4のいずれか一項に記載の物品の移動方法。
- 前記物品が鉱石を含む、請求項1~5のいずれか一項に記載の物品の移動方法。
- 前記鉱石が鉄鉱石及び粘土を含む、請求項6に記載の物品の移動方法。
- 前記物品の含水率が0~50質量%である、請求項1~7のいずれか一項に記載の物品の移動方法。
- 前記載置面が車両の荷台の表面である、請求項1~8のいずれか一項に記載の物品の移動方法。
- 前記載置面が搬送シュートの傾斜面である、請求項1~8のいずれか一項に記載の物品の移動方法。
- 鉱石を運搬するための車両の荷台の少なくとも一部の表面に、劈開性物質を含むコーティング層を形成し、当該荷台に前記鉱石を積載して運搬した後、運搬先で前記荷台を傾斜させ、前記鉱石と接する前記劈開性物質の一部を劈開させることにより、前記鉱石を前記劈開性物質の一部と共に滑り落とす、鉱石の運搬方法。
- 劈開性物質を含むコーティング層を備えた載置面を傾斜させた状態において、前記載置面上の鉱石を、当該鉱石と接する前記劈開性物質の一部を劈開させることにより、前記劈開性物質の一部と共に滑り落とす工程を有する、鉱石の運搬方法。
- 前記載置面が車両の荷台の表面である、請求項12に記載の鉱石の運搬方法。
- 前記載置面が搬送シュートの傾斜面である、請求項12に記載の鉱石の運搬方法。
- 前記劈開性物質が黒鉛を含む、請求項11~14のいずれか一項に記載の鉱石の運搬方法。
- 前記コーティング層が更にバインダーを含む、請求項11~15のいずれか一項に記載の鉱石の運搬方法。
- 前記バインダーが水溶性樹脂を含む、請求項16に記載の鉱石の運搬方法。
- 前記鉱石が鉄鉱石及び粘土を含む、請求項11~17のいずれか一項に記載の鉱石の運搬方法。
- 前記鉱石の含水率が0~50質量%である、請求項11~18のいずれか一項に記載の鉱石の運搬方法。
- 劈開性物質を含むコーティング層を備えた載置面を有する鉱石の運搬装置であって、
前記載置面は、当該載置面を傾斜させた状態において、前記載置面上の前記鉱石を、当該鉱石と接する前記劈開性物質の一部を劈開させることにより、前記劈開性物質の一部と共に滑り落とす面である、鉱石の運搬装置。 - 前記劈開性物質が黒鉛を含む、請求項20に記載の鉱石の運搬装置。
- 前記コーティング層が更にバインダーを含む、請求項20又は21に記載の鉱石の運搬装置。
- 前記バインダーが水溶性樹脂を含む、請求項22に記載の鉱石の運搬装置。
- 前記鉱石が鉄鉱石及び粘土を含む、請求項20~23のいずれか一項に記載の鉱石の運搬装置。
- 前記鉱石の含水率が0~50質量%である、請求項20~24のいずれか一項に記載の鉱石の運搬装置。
- 前記載置面が車両の荷台の表面である、請求項20~25のいずれか一項に記載の鉱石の運搬装置。
- 前記載置面が搬送シュートの傾斜面である、請求項20~25のいずれか一項に記載の鉱石の運搬装置。
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WO2022219427A1 (en) | 2021-04-14 | 2022-10-20 | 3M Innovative Properties Company | Compositions comprising cyclic olefins and thermally conductive filler and adhesion promoter |
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WO2020059216A1 (ja) | 2020-03-26 |
AU2019342365A1 (en) | 2020-05-14 |
AU2020100646A4 (en) | 2020-06-04 |
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