WO2013069744A1 - Procédé d'élimination de l'uréthane d'un matériau composite métal-uréthane - Google Patents

Procédé d'élimination de l'uréthane d'un matériau composite métal-uréthane Download PDF

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Publication number
WO2013069744A1
WO2013069744A1 PCT/JP2012/079021 JP2012079021W WO2013069744A1 WO 2013069744 A1 WO2013069744 A1 WO 2013069744A1 JP 2012079021 W JP2012079021 W JP 2012079021W WO 2013069744 A1 WO2013069744 A1 WO 2013069744A1
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Prior art keywords
oil
urethane
coating layer
metal
urethane resin
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PCT/JP2012/079021
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English (en)
Japanese (ja)
Inventor
貴之 本間
昌浩 寺田
吉朗 荒川
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日産自動車株式会社
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Publication of WO2013069744A1 publication Critical patent/WO2013069744A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B29B17/02—Separating plastics from other materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B29B17/02—Separating plastics from other materials
    • B29B2017/0213—Specific separating techniques
    • B29B2017/0293—Dissolving the materials in gases or liquids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2075/00—Use of PU, i.e. polyureas or polyurethanes or derivatives thereof, as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
    • B29L2031/3047—Steering wheels
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/62—Plastics recycling; Rubber recycling

Definitions

  • the present invention relates to a method of removing a coating layer containing urethane resin from a composite material (referred to as a metal / urethane composite material) having a cored bar and a coating layer containing a urethane resin formed on the surface of the cored bar (urethane removal) Method). Specifically, it relates to a method of removing urethane from metal / urethane composites used in automobile parts such as steering wheels and electrical equipment. In other words, recovery of metal cores and recycling of metal / urethane composites. This is a usage method.
  • Magnesium alloys have the highest strength per unit weight among practical metals and can be recycled.
  • magnesium alloys have been widely used for automotive parts and electrical equipment. Especially, it is used suitably as components for motor vehicles in which both strength and lightness are required. Recycling of automobile parts is obligatory, and it is also important that energy consumption during recycling is low and CO 2 emissions are low.
  • magnesium alloys are not sufficiently recyclable compared to iron or the like, there is a need for a recycling method that has a short working time, low cost, and good recycling efficiency. There is also a need for a recycling method that reduces the environmental burden caused by the discharge of waste liquid.
  • urethane resins are often combined with urethane resins or painted with urethane resin paints. It is necessary to separate it from In the case of iron, since the melting point is 1000 ° C. or higher, the urethane resin is decomposed prior to the melting of iron during melting. However, the melting point of the magnesium alloy is about 600 ° C., which is lower than that of iron and the like, and is easily oxidized. Therefore, there is a limit to the high temperature, and it is difficult to separate the urethane resin by decomposition during melting. Moreover, since molten magnesium has a small specific gravity, it is not easy to separate the urethane resin and its decomposition products due to the difference in specific gravity.
  • Patent Document 1 discloses a magnesium alloy coating film in which a part of a coating film is removed from a magnesium alloy material coated with a urethane resin paint by a cutter knife or wet blasting, and then the coating film is further removed with an alkaline stripping solution. A removal method is described. Further, it is also described that the magnesium alloy after removal of the coating film is melted and regenerated into an ingot.
  • an object of the present invention is to provide a method for removing urethane from a metal / urethane composite material, which has good working efficiency and can shorten the working time.
  • FIG. 2A is a view showing the appearance of the core bar after the coating layer is removed from the steering wheel of the metal / urethane composite material within a predetermined time (while the urethane resin in the coating layer is swollen and softened). Is a drawing of the front side of the cored bar, and FIG. 2B is a drawing of the back side of the cored bar of FIG. 2A.
  • the method for removing urethane from a metal / urethane composite material according to the present invention removes a coating layer containing urethane resin from a metal / urethane composite material having a metal core and a coating layer containing urethane resin formed on the surface of the metal core.
  • the method includes the following steps.
  • the metal / urethane composite material is taken out of water or oil, and the coating layer is removed within a predetermined time (while the urethane resin in the coating layer is in a certain swelling and softened state). It includes two steps.
  • the metal / urethane composite material is swelled and softened in water (including steam) or oil heated to a predetermined temperature for a predetermined time, so that the urethane resin is not dissolved (peeled).
  • the coating layer can be removed from the metal / urethane composite material in a short time with high work efficiency.
  • Patent Document 1 it is possible to provide a urethane removal method that has high work efficiency from the metal / urethane composite material and can shorten the work time as compared with the prior art (Patent Document 1).
  • Mg alloys are progressing in automobile parts, but among them, Mg alloys are often used for the core metal of the steering wheel.
  • a steering wheel usually has a structure in which a core metal made of a magnesium alloy is covered with a coating layer containing a urethane resin formed by foaming a crosslinked polyurethane resin composition.
  • the coating layer can be formed by RIM molding (Reaction Injection Molding) or the like.
  • Such a coating layer often contains carbon black or the like in order to improve the strength. Since such a urethane resin has high adhesion to the core metal (Mg alloy), it is difficult to peel from the core metal (Mg alloy).
  • the urethane resin since the urethane resin is crosslinked, it cannot be dissolved in an organic solvent, and it is difficult to dissolve and remove the organic resin using an organic solvent.
  • the cored bar may be provided with a recess (V-shaped groove around the entire steering) to prevent peeling (especially prevention of rotation of the coating layer during gripping), or the spoke may be integrally formed. Often, this makes peeling more difficult.
  • urethane resin is a foam containing air, its thermal conductivity is low, and heat decomposition by firing hardly transfers heat to the inside, so only the surface is carbonized first and internal decomposition is difficult to proceed. It was difficult to completely remove the film.
  • the present inventors have found that the core metal (Mg alloy) surface and the urethane resin are not chemically bonded, both It is known that they are bonded by the intermolecular van der Waals force. Based on this knowledge, even if the alkali stripping solution penetrates to the interface between the metal core and the urethane resin, and the core metal and urethane resin at the interface are not dissolved and peeled off, the urethane resin is swollen and softened to increase the bond distance between molecules. And found that van der Waals power can be reduced.
  • Metal / urethane composite material The metal / urethane composite material that can be used in the present embodiment is not particularly limited, and any conventionally known metal / urethane composite material can be applied.
  • examples of the metal / urethane composite material include a steering wheel, a seat seat frame, a shift knob, a door knob, a saddle, and a handle, but are not limited thereto. Absent.
  • examples of the metal / urethane composite material include, but are not limited to, a handle / knob of game equipment, a handle of health equipment, and the like.
  • Examples of vehicles such as vehicles include vehicles, aircraft, ships, and other general construction machines such as bulldozers, excavators, truck cranes, and forklifts. However, it is not limited to these.
  • Vehicles include automobiles that use gasoline or bioethanol as fuel, electric vehicles that use secondary batteries or fuel cells, and four-wheeled vehicles such as hybrid vehicles (passenger cars, trucks, buses, etc.); motorcycles, bicycles; railways Vehicles (trains, hybrid trains, locomotives, etc.) are examples.
  • Examples of the electric device include an amusement vehicle. However, it is not limited to these.
  • the core metal material is not particularly limited as long as it is a metal material (including an alloy) satisfying characteristics (for example, mechanical strength, specific gravity) and economy (cost) according to the purpose of use. It is not a thing.
  • the metal materials (including alloys) include magnesium and its alloys, aluminum and its alloys, iron and its alloys (including stainless steel), titanium and its alloys, cobalt and its alloys, nickel and its alloys, copper and its Examples include alloys, but are not limited thereto.
  • it is a metal (alloy) that has a lower melting point than a metal in which the urethane resin is decomposed prior to melting of iron by melting and is difficult to separate the urethane resin by decomposition at the time of melting.
  • metals are difficult to melt and the application of the urethane removal method of the present invention is extremely effective. From this viewpoint, a magnesium alloy or an aluminum alloy is preferable. These metals (alloys) are excellent in that they have higher mechanical strength, can be reduced in weight with a low specific gravity.
  • the magnesium alloy of the core metal only needs to have magnesium as a main component, and the content of magnesium element is usually 50% by mass or more, and preferably 80% by mass or more.
  • Magnesium alloys include Mg—Al alloys, Mg—Al—Zn alloys, Mg—Al—Mn alloys, Mg—Zn—Zr alloys, Mg—rare earth elements alloys, Mg—Zn—rare earth elements alloys. Etc. Normally, Mg—Al based alloys are used for the steering wheel cores.
  • the aluminum alloy of the core metal only needs to have aluminum as a main component, and the content of the aluminum element is usually 50% by mass or more, and preferably 80% by mass or more.
  • Aluminum alloys include Al-Mg alloys, Al-Mg-Zn alloys, Al-Mg-Mn alloys, Al-Zn-Zr alloys, Al-rare earth elements alloys, Al-Zn-rare earth elements alloys. Etc. Usually, an Al—Mg alloy is used for the core for the steering wheel.
  • the form (shape) of the core bar is not particularly limited.
  • a part having a specific shape for each part such as a form (shape) of a core bar used for a steering wheel, a seat seat frame, a shift knob, a door knob, or the like can be a target.
  • the shape of the steering wheel is usually composed of a rim portion that a passenger grips, a spoke portion, and a boss portion that is attached to the vehicle body.
  • the mandrel of the steering wheel made of magnesium alloy may be one in which the rim, spoke and boss are integrally formed of, for example, Mg alloy or Al alloy, or Mg alloy or Al may be formed only on a part of the steering wheel.
  • a cored bar made of an alloy or the like may be used.
  • the rim portion is usually circular. Further, in order to improve the adhesion between the coating layer and the cored bar and prevent displacement, the rim part of the cored bar is often formed with a groove (concave) on the surface.
  • (B) Coating layer As a coating layer containing a urethane resin (including a foamed urethane resin) formed on the surface of the core metal, the urethane of the present embodiment can be used as long as the urethane resin is directly formed on the core metal surface. A removal method is applicable.
  • the whole of the core metal of the steering wheel may be covered with a coating layer, or only a part thereof may be covered with a film.
  • the entire rim portion is covered with a coating layer.
  • the coating layer containing a urethane resin As a structure of the coating layer containing a urethane resin, (i) the coating layer of the single layer structure which consists of urethane resins; (Ii) A multi-layer coating layer comprising: a urethane resin formed on the surface of the core metal; and a wood-tone resin film or a wood-like thin plate-like wood formed for the purpose of imparting design properties to the urethane resin surface ; (Iii) A multilayer comprising: a urethane resin formed on the core metal surface; and a leather material bonded or stitched to the urethane resin surface for the purpose of imparting design properties, a high-class feeling of leather products, a feeling of touch, etc. And the like.
  • the urethane removing method of the present embodiment has a urethane resin formed on the surface of the core metal, and can particularly effectively act on a coating layer having high adhesion with the core metal.
  • the urethane resin is not particularly limited, and conventionally known resins can be used. Further, the urethane resin may be one having a urethane resin as a main component (50% by mass or more, preferably 80% by mass or more, more preferably 90% by mass or more). As needed, additives, such as antioxidant, a light stabilizer, a foaming agent, or a filler, may be contained individually by 1 type or in combination of 2 or more types.
  • the urethane resin is usually a urethane bond formed by condensation of a compound (for example, polyisocyanate and polyol) having an OH (hydric acid) group such as an NCO (isocyanate) group and an alcohol group. It is a molecular compound.
  • a crosslinked structure can be introduced by using a polyisocyanate or polyol having a valence of 3 or more.
  • foamed urethane resins (various foamed urethane resins having different foaming ratios) are suitably used.
  • the urethane foam resin is made into a resin by mixing a foaming agent (water, fluorocarbon, etc.), a foam stabilizer (silicone oil), a catalyst (amine compound, etc.), a colorant, etc. with a polyol and polyisocyanate as main components. However, it is foamed (foam).
  • the rigid urethane foam comprises a polyisocyanate having two or more NCO (isocyanate) groups and a polyol having two or more OH (hydric acid) groups, a catalyst (amine compound, etc.), a blowing agent (water, fluorocarbon, etc.), It is a uniform plastic foam obtained by mixing together with a foam stabilizer (silicone oil), etc., and performing foaming reaction and resinification reaction simultaneously. It looks like a collection of small bubbles, and each of these small hard bubbles is an independent bubble that contains a gas that is difficult to transfer heat.
  • the rigid urethane foam maintains an excellent heat insulation performance unlike any other over the long term.
  • the urethane resin is a foam
  • a soft hand can be obtained and the material can be reduced in weight.
  • the heat insulation is also high.
  • RIM molding is suitably used as a method for forming a coating layer made of a urethane resin foam. This is a method in which two or more types of monomers are mixed and injected into a mold together with a catalyst, a crosslinking agent, a foaming agent, and the like to cause a polymerization reaction and foam at the same time to obtain a foam molded product.
  • the injection pressure may be low, and it is suitably used for the production of a steering wheel coating layer.
  • a urethane resin molding material suitable for such RIM molding for example, a crosslinked polyurethane composition described in JP-A-2006-199719 can be used, but is not limited thereto.
  • the thickness of the coating layer covering the cored bar is not particularly limited, but is usually about 1 to 30 mm.
  • Urethane resin has good adhesion to a core metal (Mg alloy, Al alloy, etc.), and is suitably used as a coating layer for a steering wheel.
  • the specific gravity of the urethane resin in the coating layer is not particularly limited, and a specific gravity according to the purpose of use is used.
  • the specific gravity of urethane resin is usually in the range of 0.3 to 0.7.
  • the specific gravity of the urethane resin is preferably in the range of 0.4 to 0.6, more preferably in the range of 0.4 to 0.5.
  • the present embodiment is not limited to these ranges. In other words, in the examples, a comparative study is performed without performing the pretreatment process.
  • the pretreatment process described below is performed, and then This is because the work of removing the coating layer in the second step can be greatly shortened.
  • the specific gravity of a urethane resin can be measured using a specific gravity measuring device.
  • FIG. 1 is a process diagram in a method for removing urethane from a metal / urethane composite material.
  • the first step 13 and the second step 15 are essential as the steps in the method of removing urethane from the metal / urethane composite material, and further, the urethane resin is swollen and softened in the first step 13.
  • oil it is desirable to perform the third step 17 after the second step 15.
  • the coating layer has a multilayer structure including a urethane resin, it is desirable to perform the pretreatment step 11.
  • it demonstrates in order of a process including an arbitrary process.
  • any one of the following steps (i) and (ii) is performed before the first step 13.
  • the coating layer has a multilayer structure including a urethane resin
  • the multilayer structure for example, a multilayer structure in which a coating layer is further provided with an outer layer such as a resin coating, a thin plate-like wood, and a leather material on the surface (outside) of a urethane resin (inner layer) formed on the surface of the core metal.
  • an outer layer such as a resin coating, a thin plate-like wood, and a leather material on the surface (outside) of a urethane resin (inner layer) formed on the surface of the core metal.
  • a step of forming mechanical damage on the coating layer is performed. Specifically, a step of cutting the coating layer with a depth reaching the surface of the metal core with a blade (for example, a cutter knife) or the like is performed. At this time, when the cored bar is recycled, it is desirable that the surface of the cored bar is not damaged. For example, as shown in FIG. 1, when the steering wheel 21 is taken as an example, an outer layer resin film, a thin plate-like wood or leather material constituting the coating layer 23 with a blade (for example, a cutter knife; not shown), Further, a process of making a notch 25 having a depth reaching the surface of the core metal through the inner layer urethane resin is performed.
  • the coating layer is not limited to the case where the urethane resin is a multilayer structure, and even when the coating layer is made of a urethane resin, the step of forming mechanical damage may be performed in the same manner as in the above (i). Good. Thereby, an above-described effect can be produced.
  • a step of cutting the stitched portion of the outer layer of the covering layer having the stitched portion is performed. For example, taking a steering wheel as an example, a step of cutting the stitched portion (sewn portion, sewing thread along the seam) of the leather material of the outer layer of the covering layer having a stitched (sewn) portion with a blade (for example, scissors) I do.
  • a blade for example, scissors
  • water or oil heated to a predetermined temperature can permeate the urethane resin in a short time, swell and soften, and molecules between the core material surface and the urethane resin. It is excellent in that the bond distance between them is wide and van der Waals force can be reduced.
  • This allows the urethane resin in the coating layer to swell and soften by allowing the metal / urethane composite material to stand in water (including steam) or oil heated to a predetermined temperature for a predetermined time, thereby dissolving the urethane resin.
  • the bonding force with the metal surface can be greatly reduced without (peeling).
  • hot water or hot oil is sufficiently applied to the urethane resin in the coating layer only by placing it in water or oil heated to a predetermined temperature as described above for a predetermined time without performing the above pretreatment step.
  • the urethane resin in the coating layer can be swollen and softened by impregnation.
  • the temperature of the water heated to the predetermined temperature in the first step is not particularly limited as long as it is in a temperature range in which the above-described effects can be achieved, but is preferably in the range of 40 to 100 ° C., more preferably Is in the range of 60-100 ° C. If the temperature of water is 40 degreeC or more, it is excellent in the point which can fully swell and soften the urethane resin in a coating layer. On the other hand, if the temperature of water is 100 ° C. or lower, it is not necessary to use an expensive pressure-resistant device and the pressure is high, which is economically excellent.
  • the amount of energy such as electricity and gas used for heating in the process and the amount of CO 2 emitted when the energy is generated can be suppressed.
  • the water temperature is within the above range, the urethane resin will not be decomposed and dissolved in the water from the metal / urethane composite material. By simply replenishing the water, the water can be used over and over again.
  • the heated water here includes steam (water vapor). This is because even if steam is used, the urethane resin of the coating layer can be impregnated with hot water, and the above-described operational effects can be sufficiently exhibited.
  • the urethane resin impregnated with water is removed in the next step and then dried and regenerated (recycled) using, for example, a regeneration technique
  • a regeneration technique it is desirable to use clean water with relatively low cost and high purity.
  • the regeneration technique is not particularly limited, and a conventionally known regeneration technique can be used.
  • a cushion material containing parenchyma cells described in JP 2010-208306 A proposed by the present applicant. Recycling can be achieved using a method or the like.
  • the temperature of the oil heated to the predetermined temperature in the first step is not particularly limited as long as it is in a temperature range in which the above-described effects can be obtained, but is preferably in the range of 40 to 200 ° C. More preferably, it is in the range of 80 to 200 ° C. If the temperature of oil is 40 degreeC or more, it is excellent in the point which can fully swell and soften the urethane resin in a coating layer. On the other hand, if the temperature of the oil is 200 ° C. or lower, the oil to be used can be widely used without being limited.
  • the amount of energy such as electricity and gas used for heating in the process and the amount of CO 2 emitted when the energy is generated can be suppressed.
  • the temperature of the oil is within the above range, the urethane resin will not be decomposed and dissolved from the metal / urethane composite material into the oil. By simply replenishing the oil, the oil can be used over and over again.
  • the oil to be used may be any of mineral oil, vegetable oil, and animal oil, and these waste oils may be used (see Examples described later).
  • various amounts of various additives for example, surfactants, antioxidants, ultraviolet absorbers, lubricants, etc.
  • the mineral oil is not particularly limited, and a conventionally known mineral oil can be used.
  • petroleum naphtha, gasoline, light oil, kerosene, heavy oil
  • mineral oil mineral oil (mineral oil), paraffin, baby oil, liquid paraffin, ceresin, mineral wax, petroleum wax, silicon oil, dredging oil, shale oil, creosode oil
  • Examples of the vegetable oil include castor oil (castor oil), tung oil, nanjo oil oil (Yatropha oil), bird mill oil, linseed oil (flux seed oil, linseed oil), shortening, salad oil, white squeezed oil, corn oil, large Bean oil, sesame oil (sesame oil), rapeseed oil (canola oil), safflower oil (safflower oil), sunflower oil, rice bran oil, coconut oil, coconut oil, palm oil, palm kernel oil, coconut oil (copra oil), cottonseed oil, hemp seed oil (Hemp oil), camellia oil, poppy oil (poppy seed oil), mustard oil, wheat germ oil, evening primrose oil, shiso oil, camellia oil, camellia oil, apricot kernel oil (apricot kernel oil), akebi oil (akebi seed oil) , Mountain tea flower oil (tea plum oil), tea oil, walnut oil, birch oil, daifu oil, soybean oil, nut
  • Animal oils include, for example, lard, het (beef tallow), bone fat, bone oil, fish oil, chicken oil, duck oil, chick bird oil, cocoon oil, coconut oil, lanolin (wool grease), Schmalz, butter, emu oil, su Oil (sea bream oil), ghee, catfish oil (main ingredients are horse oil), whale oil, dolphin oil, mink oil, squalane, egg yolk oil, liver oil, cocoon oil, cow leg oil, beeswax, etc. It is not limited. These oils (including waste oil) may be used alone or in combination of two or more.
  • waste oil such as hydraulic oil, gear oil, cutting oil, etc. of a vehicle such as an automobile generated during the production or disassembly of a vehicle such as an automobile as in the case of a steering wheel. This is because the waste oil can be reused as it is without incurring transportation and recovery costs.
  • mineral oil or vegetable oil when degreasing, drying, and regenerating (recycling) using a regeneration technique, for example.
  • the regeneration technique is not particularly limited, and a conventionally known regeneration technique can be used.
  • a conventionally known regeneration technique can be used.
  • the production of a cushion material containing parenchyma cells described in JP 2010-208306 A proposed by the present applicant. Recycling can be achieved using a method or the like.
  • the time in which the metal / urethane composite material in the first step is placed in water heated to a predetermined temperature is particularly limited as long as it is in a temperature range where the above-described effects can be achieved. Although it is not a thing, Preferably it is the range for 5 minutes or more, More preferably, it is the range for 10 minutes or more. If the time of placing in water heated to the above-mentioned predetermined temperature is 5 minutes or more, it is excellent in that the urethane resin in the coating layer can be sufficiently swollen and softened.
  • the upper limit value of the time in the water heated to the above-mentioned predetermined temperature is not particularly limited, but if it is approximately 60 minutes or less, the energy such as electricity and gas used for the heating in the process. It is also excellent for the global environment in that the amount and the amount of CO 2 emitted when producing the energy can be suppressed.
  • the above range is not limited at all, and the present invention can be applied as long as it is within the range in which the effects of the present invention can be effectively expressed.
  • the time for which the metal / urethane composite material in the first step is placed in the oil heated to a predetermined temperature is not particularly limited as long as it is in a temperature range in which the above-mentioned effects can be achieved, but preferably 5 minutes. It is the above range, More preferably, it is the range for 10 minutes or more. If the time of placing in the oil heated to the above-mentioned predetermined temperature is 5 minutes or more, it is excellent in that the urethane resin in the coating layer can be sufficiently swollen and softened. On the other hand, the upper limit value of the time in the oil heated to the above-mentioned predetermined temperature is not particularly limited. However, if it is approximately 60 minutes or less, such as electricity or gas used for heating in the process.
  • a heater may be wound directly around the water tank 27 or the oil tank 27 ′ (not shown), or a heating source such as a heater (coil heater) may be installed inside the water tank 27 or the oil tank 27 ′ ( It is not particularly limited.
  • steam may be sprayed onto the metal / urethane composite material, or it may be simply steamed with steam.
  • steaming steam with steam from the bottom of a steamer containing metal / urethane composite material swells urethane resin. It may be softened.
  • a plurality of metal / urethane composite materials can be used together (a number that can be processed in the next step 15). From the viewpoint of production efficiency, it is desirable to swell and soften with a certain interval. At this time, the metal / urethane composites are in close contact with each other, so that the water or oil penetration does not become uneven depending on the location. It is good to make it go around.
  • the swelling rate of the urethane resin in the coating layer at the end of the first step is not particularly limited.
  • water it is 0.5% or more, particularly 1.5% or more
  • the metal / urethane composite material can be efficiently removed in a short time.
  • the coating layer can be removed.
  • the upper limit value of the swelling ratio of the urethane resin in the coating layer at the end of the first step is not particularly limited. That is, swelling may be performed up to the maximum swelling rate of each urethane resin (that is, a saturated state filled with water or oil that can be impregnated inside the urethane resin under a predetermined heating temperature condition).
  • the swelling ratio of the urethane resin is calculated by the following formula (1) or (2) (in the examples and comparative examples described later, both are easy to measure in a short time, and the following formula (1) with little measurement error.
  • formula (1) or (2) in the examples and comparative examples described later, both are easy to measure in a short time, and the following formula (1) with little measurement error.
  • (C) Second step 15 In the second step 15, after the first step 13, the step of taking out the metal / urethane composite from water or oil and removing the coating layer within a predetermined time is performed.
  • the coating layer can be removed while the mechanical strength is greatly reduced.
  • the coating layer can be removed from the metal / urethane composite material in a short time with high work efficiency. That is, the metal / urethane composite material is excellent in that the work efficiency is good and the work time can be greatly shortened even compared with the prior art (for example, Patent Document 1).
  • the time for removing the coating layer within the predetermined time in the second step is preferably within 40 minutes, preferably within 30 minutes, more preferably within 20 minutes.
  • the time for removing the coating layer within the predetermined time in the second step is preferably within 40 minutes, preferably within 30 minutes, and more preferably within 25 minutes.
  • the swollen and softened state bonding force with the core metal surface In the state where the mechanical strength is greatly reduced, it is excellent in that the coating layer can be easily removed from the metal / urethane composite material with work efficiency.
  • the swelling ratio of the urethane resin in the coating layer (in the swollen and softened state) at the end of the second step is 0.5% or more, preferably 1.5% when water is used in the first step.
  • the upper limit value of the swelling ratio of the urethane resin in the coating layer in the swollen and softened state is not particularly limited. That is, swelling may be performed up to the maximum swelling rate of each urethane resin (that is, a saturated state filled with water or oil that can be impregnated inside the urethane resin under a predetermined heating temperature condition).
  • the swelling rate of a urethane resin shall be computed by said Formula (1) or (2).
  • the method for removing the coating layer from the metal / urethane composite material is not particularly limited, and a conventionally known method can be used, and an appropriate method according to the shape of the metal / urethane composite material.
  • a simple jig may be used so that the work can be performed more efficiently.
  • such a jig may be used to automate the removal operation to further increase the work efficiency.
  • the entire covering layer 23 ′ of the rim portion 22 ′ of the tearing wheel 21 ′ is within a predetermined time (in a so-called swollen and softened state).
  • a notch is made around the core with a plastic spatula or the like (see FIG. 1). Then, it may be peeled up and down along the cut portion 25a.
  • the coating layer (not shown) in the concave portion (V-shaped groove) can be removed cleanly.
  • the notch is formed all around the coating layer 23 of the rim portion 22 in the pretreatment step 11, it is only necessary to peel it up and down along the notch portion 25, and the working time can be shortened.
  • the urethane resin (coating layer 23) is not swollen or softened, and the same cutting operation can be performed in a shorter time when the same cutting operation is performed. Therefore, when the coating layer is not a multilayer structure but a single layer structure made of urethane resin, it is better in terms of work efficiency to omit the pretreatment step 11.
  • the coating layer may remain in the concave portion (V-shaped groove) of the rim portion. Even in such a case, the V-shaped resin guide can be easily peeled off by inserting it along the concave portion (V-shaped groove) of the rim portion.
  • the covering layer 23 'of the spoke portion 24' and the boss portion 26 'of the steering wheel 21' is also the same as the covering layer 23 'of the rim portion 22' within a predetermined time (while being swollen and softened). Cut with a resin spatula to reach the cored bar 33. Then, it may be peeled off along the cut portion 25a into which the cut has been made.
  • the notch 25 is formed in the coating layer 23 of the spoke part 24 and the boss
  • a jig or the like that can simultaneously cut and peel the coating layer of a metal / urethane composite material (for example, a steering wheel).
  • a metal / urethane composite material for example, a steering wheel.
  • a jig for automation a jig having a roller, a rotary motor, etc. so that the rim portion of the steering wheel in a swollen and softened state can be rotated concentrically and the rotation speed can be adjusted.
  • the jig has a cleaving tool (for example, a resin spatula, etc.) on the periphery of the rim that can be freely adjusted in the cutting depth in the center direction (depth direction) of the rim that is swollen and softened. Is provided. Further, the jig includes a peeling tool (for example, a pointed resin guide, etc .; the depth of which can be adjusted in the center direction) that can be peeled up and down along the cut portion. It is provided on the outside of the peripheral portion behind the slitting tool (backward with respect to the rotation direction). The peeling tool (pointed resin guide) may be provided at a plurality of locations so that it can be peeled off in the vertical direction stepwise.
  • a cleaving tool for example, a resin spatula, etc.
  • the resin guide provided on the rear side may be larger, and in the resin guide provided on the rear side, the mounting position is provided at two locations on the upper side and the lower side of the widened cut portion. May be. Further, a resin guide suitable for the V-shaped groove may be further provided.
  • the rim portion of the steering wheel installed in the jig (so-called swollen and softened) are rotated concentrically at a constant speed.
  • a plastic spatula is pressed against the rotating rim (swelled and softened) so that the notch is made deeper and deepened until it reaches the core metal surface.
  • the resin spatula is fixed to.
  • the resin guide is inserted to a depth that reaches the surface of the core metal along the cut portion inserted in the rotating rim portion, and is peeled up and down while being expanded in the vertical direction.
  • the coating layer can be removed within a predetermined time (while being swollen and softened).
  • a dedicated resin guide suitable for the V-shaped groove is inserted along the V-shaped groove of the rotating rim portion to the depth reaching the core metal surface at the bottom of the groove.
  • the coating layer of the V-shaped groove can also be removed within a predetermined time (while being swollen and softened).
  • limb part it should sever and cut up and down along a notch part using a resin spatula etc. by hand so that it may reach a metal core. By doing so, the spoke portion and the boss portion other than the rim portion can also be removed within a predetermined time (while being swollen and softened).
  • the coating layer 23 ′ is removed from the steering wheel 21 ′ of the metal / urethane composite material within a predetermined time (while being swollen and softened) in the coating layer 23 ′. By doing so, it can be divided into a core metal 33 and a coating layer 23 '. Of these, the coating layer 23 ′ may be recovered at this point and recycled or industrial waste.
  • the metal core 33 when water (hot water) 27 is used, it is recovered at this time and may be recycled as a metal core for steering wheel, an ingot or the like.
  • oil (hot oil) 27 ′ is used, the third step 17 shown below is performed, collected, and recycled as a steering wheel core bar, ingot, or the like.
  • FIG. 2 shows a core bar after removing the coating layer from the steering wheel of the metal / urethane composite material within a predetermined time (while it is swollen and softened) in the coating layer (step 15 in FIG. 1). It is drawing which represented the external appearance of the metal core 33).
  • 2A is a drawing of the front side of the cored bar
  • FIG. 2B is a drawing of the back side of the cored bar of FIG. 2A.
  • the coating layer can be reliably removed in a short time.
  • (D) Third step 17 In the third step 17, when oil is used in the first step 13, the second step 15 is followed by a step of degreasing and washing the core after removing the coating layer. As a result, oil remaining on the surface of the metal core can be washed away, and the degreased metal core can be heated and melted and reused as an ingot, or a coating layer can be formed and recycled as a metal / urethane composite material. .
  • the degreasing solvent that can be used for oil degreasing and washing is not particularly limited, and conventionally known degreasing solvents can be used.
  • gasoline, naphtha, petroleum, carbon tetrachloride, acetone, alcohol, ethanol, trichloroethylene, perchloroethylene, methylene chloride, methylpyrrolidone, and the like can be used.
  • Commercially available detergents may also be used, for example, detergent (chemical name) Techniclean 200 EF (supplier; B-P Japan Co., Ltd., ingredients; diphosphate tetrapotassium salt diphosphate and tetrapotassium, silicic acid.
  • the degreasing and cleaning method in this step 17 it is preferable to carry out the following procedures (1) to (3), but the procedure is not limited to these procedures.
  • a cloth material such as a cloth (cloth used for wiping off machine oil or wiping off dirt and impurities). This is excellent in that most of the oil on the surface of the metal core can be efficiently removed.
  • the cloth material is not particularly limited as long as it is a cloth material, a paper material, an oil-absorbing soft resin sheet, etc., which are excellent in oil absorption, and conventionally known materials can be used.
  • the core metal wiped off with the cloth material is degreased and washed.
  • the core metal may be immersed in the above-described degreasing solvent (which may be stirred) and degreased and washed.
  • the above-described degreasing solvent which may be stirred
  • an ultrasonic cleaner oscillation frequency 28 KHz
  • a degreasing solvent 37 is sprayed or sprayed (sprayed or sprayed) on a metal core 31a to which oil adheres, from a faucet 35 leading to a degreasing solvent storage tank (not shown).
  • washing There is no particular limitation such as washing, and a conventionally known method can be used.
  • the former especially degreasing with an ultrasonic cleaner
  • the former is desirable from the viewpoint of the working environment, temperature control of the degreasing solvent, and recycling of the degreasing solvent after use.
  • a suitable dryer hot air dryer, etc. It may be dried.
  • the core metal it is desirable to wash the core metal by immersing it in an ultrasonic cleaner (oscillation frequency 28 KHz) filled with water. This is because the degreasing solvent remaining in the narrow gap of the core metal can be sufficiently washed.
  • an appropriate dryer hot air dryer, etc.
  • the drying conditions are not particularly limited as long as the water can be quickly evaporated. For example, a hot air drying of about 40 to 200 ° C.
  • the above-described degreasing and washing, water washing and drying procedures of (2) and (3) as well as the first step 13 are performed by appropriately combining a plurality of core bars 31a. It is desirable from the standpoint of production efficiency that the degreasing, washing and drying be performed with a certain interval. At this time, the core metal 31a to which the oil adheres is in close contact with each other, so that the cleaning and drying effects do not become uneven depending on the location, and the degreasing solvent 37 and the cleaning water are spaced apart from each other at appropriate intervals.
  • step 17 (1) wiping with a cloth material, (2) degreasing, (3) washing and drying the cored bar 31 (see FIG. 1) is recovered, and the steering wheel cored bar or ingot And the like. Even when water is used in the first step 13, after the second step 15, the above-described (3) washing with water (especially washing with an ultrasonic cleaner) and drying the core after removing the coating layer are performed. May be.
  • the time required for removing the urethane (the time required for all the steps described above) is within 60 minutes, preferably within 50 minutes, more preferably within 40 minutes, particularly preferably when water is used in the first step. It is within 30 minutes, or when oil is used in the first step, it is within 80 minutes, preferably within 70 minutes, more preferably within 60 minutes. If the time required for removing the urethane (the time required for all the above steps) is within 60 minutes when water is used in the first step, all steps from the pretreatment step (optional) to the second step are performed. be able to.
  • the coating layer can be easily and efficiently worked from the metal / urethane composite material. It is excellent in that it can be removed. If the time required for urethane removal (the time required for all the above steps) is within 80 minutes when oil is used in the first step, all steps from the pretreatment step (optional) to the third step are performed. be able to.
  • the coating layer can be easily and efficiently worked from the metal / urethane composite material. It is excellent in that oil that adheres to the metal core can be removed sufficiently.
  • the method for regenerating a metal / urethane composite material uses a cored bar obtained by the method of removing urethane from the metal / urethane composite described above, and a coating layer containing a urethane resin on the surface of the cored bar. It is formed and recycled as a metal / urethane composite material.
  • a metal core obtained by the above-described method for removing urethane from the metal / urethane composite material using a metal core for a steering wheel, a coating layer containing urethane resin is formed on the surface of the metal core, and is reproduced as a steering wheel.
  • a metal core such as aluminum, magnesium, or iron is used for the steering wheel core metal, and effective utilization is desired from the viewpoint of raw materials.
  • the coating layer can be removed from the steering wheel of the used product or the damaged product, and it can be reused as it is without being melted by heating and ingot. It is excellent in that it can be effectively used from recycled parts.
  • the amount of CO 2 emission is small and the energy efficiency is excellent. Are better.
  • a coating layer containing a urethane resin on the surface of the core metal using the core metal obtained by the urethane removal method from the metal / urethane composite described above there is no limitation. It can be manufactured in the same manner as a normal product (metal / urethane composite material) using an existing metal / urethane composite material (for example, steering wheel) manufacturing facility. In particular, in the case of a damaged product generated at the time of manufacture, it is also excellent in that it is not necessary to newly install a separate manufacturing facility or add an additional manufacturing facility.
  • the core metal regeneration method of the present invention is characterized in that the core metal obtained by the urethane removal method from the above-mentioned metal / urethane composite material is heated and melted to regenerate as an ingot. .
  • the core metal for the steering wheel is regenerated as a metal ingot such as Mg alloy as the metal core obtained by the method of removing urethane from the metal / urethane composite material.
  • a metal ingot such as Mg alloy
  • the core metal for the steering wheel is regenerated as a metal ingot such as Mg alloy as the metal core obtained by the method of removing urethane from the metal / urethane composite material.
  • the temperature at which the cored bar is melted by heating is appropriately determined according to the difference in the type (melting temperature) of the cored bar material.
  • a conventionally known manufacturing technique can be used as appropriate.
  • an appropriate additive may be added, or an appropriate gas may be blown to remove impurities by sedimentation or floating, etc.
  • a metal for example, Zn or Mn
  • ingots having different compositions such as Mg—Al—Zn based alloys and Mg—Al—Mn based alloys suitable for different purposes of use may be manufactured.
  • the recycled metal ingots such as Mg alloy and the like can be used for the manufacture of core bars such as a steering wheel, a seat seat frame, a shift knob, and a door knob.
  • the metal ingot such as Mg alloy obtained by smelting from a normal mineral may be used by blending the metal ingot such as Mg alloy regenerated in this embodiment in an appropriate ratio.
  • you may utilize for the use completely different from the conventional metal core for example, you may use for the housing
  • Example 1 (Mg alloy core + urethane specific gravity 0.4 urethane resin coating layer steering wheel ⁇ hot water immersed in 10 minutes, coating layer removal operation)
  • A First step (a-1) As a laboratory water tank (container), 40 liters of water was prepared in a cooking zundo (inner diameter 430 mm, depth 455 mm), and water was heated. Tap water was used as water. The temperature of water was measured using a K thermocouple (the same applies to the following examples).
  • the first step was completed 10 minutes after the steering wheel was introduced. After completion of the first step, the swelling ratio of the urethane resin immediately after pulling up the steering wheel (within 1 minute) was 2.6%. The swelling ratio of the urethane resin was calculated by the above formula (1) (the same applies to the following examples).
  • the coating layer (urethane resin) of the part and the boss part was removed (the core metal and the resin layer were separated and recovered), and the second step was completed (see FIGS. 2A and 2B).
  • the time required for removing the urethane resin was 5 minutes.
  • the swelling ratio of the urethane resin at the end of the second step was 2.6%.
  • the collected metal core can be recycled for steering wheel manufacturing or alloy ingot manufacturing.
  • the recovered coating layer (urethane resin) can be used for industrial waste treatment or recycling.
  • the swelling ratio of the urethane resin immediately after pulling up the steering wheel was 1.8%.
  • the time required for the operation of removing the urethane resin in the second step was 6 minutes.
  • the swelling ratio of the urethane resin immediately after pulling up the steering wheel was 1.8%.
  • the time required for the operation of removing the urethane resin in the second step was 18 minutes.
  • Example 4 Al alloy core + steering wheel of urethane resin coating layer having a specific gravity of 0.4 ⁇ after removing the coating layer after immersion in hot water for 10 minutes
  • a hot water heating experiment was conducted in the same manner as in Example 1 except that a steering wheel made of a foamed urethane resin coating layer having a specific gravity of 0.4 formed on the core metal surface by RIM molding was used.
  • the swelling ratio of the urethane resin immediately after pulling up the steering wheel was 2.6%.
  • the time required for the operation of removing the urethane resin in the second step was 5 minutes.
  • Example 5 Al alloy core + urethane resin coating layer having a specific gravity of 0.5, steering wheel ⁇ immersing the coating layer after immersion in hot water for 10 minutes
  • a hot water heating experiment was conducted in the same manner as in Example 1 except that a steering wheel composed of a foamed urethane resin coating layer having a specific gravity of 0.5 formed on the core metal surface by RIM molding was used.
  • the swelling ratio of the urethane resin immediately after pulling up the steering wheel was 1.8%.
  • the time required for the operation of removing the urethane resin in the second step was 6 minutes.
  • Example 6 Al alloy cored bar + urethane resin coating layer having a specific gravity of 0.55, steering wheel ⁇ hot water 10 minutes immersion, coating layer removal operation
  • a hot water heating experiment was conducted in the same manner as in Example 1 except that a steering wheel composed of a foamed urethane resin coating layer having a specific gravity of 0.5 formed on the core metal surface by RIM molding was used.
  • the swelling ratio of the urethane resin immediately after pulling up the steering wheel was 1.8%.
  • the time required for the operation of removing the urethane resin in the second step was 18 minutes.
  • Example 7 (Mg alloy cored bar + urethane resin coating layer with specific gravity 0.4 Steering wheel ⁇ After immersion for 15 minutes in medium temperature vegetable oil, coating layer removal operation ⁇ cored bar degreasing cleaning)
  • A First step (a-1) As an experimental oil tank (container), 40 liters of vegetable oil was prepared in a cooking zundo (inner diameter 430 mm, depth 455 mm), and the vegetable oil was heated. . Waste oil such as salad oil was used as the vegetable oil. The temperature of the vegetable oil was measured using a K thermocouple (the same applies to the following examples).
  • a steering wheel comprising a coating layer made of foamed urethane resin (4) was used.
  • the first step was completed 15 minutes after the steering wheel was introduced. After completion of the first step, the swelling ratio of the urethane resin immediately after pulling up the steering wheel (within 1 minute) was 2.7%.
  • the coating layer (urethane resin) of the part and the boss part was removed (the core metal and the resin layer were separated, and the coating layer was recovered in this step), and the second step was completed.
  • the time required for removing the urethane resin was 4 minutes.
  • the recovered coating layer (urethane resin) can be used for industrial waste treatment or recycling.
  • a degreasing solvent oscillation frequency 28 KHz
  • the washing (drying) time of this step according to the above (1) to (3) was 15 minutes.
  • the collected metal core can be recycled for steering wheel manufacturing or alloy ingot manufacturing.
  • the degreasing solvent (cleaning liquid) used for the degreasing cleaning can also be used for industrial waste treatment or recycling after recovery.
  • Example 8 Steering wheel of medium temperature vegetable oil 15 minutes after immersion, coating layer removal operation ⁇ cored bar degreasing cleaning
  • the swelling ratio of the urethane resin immediately after raising the steering wheel (within 1 minute) was 2.0%.
  • the time required for the operation of removing the urethane resin in the second step was 5 minutes.
  • the swelling ratio of the urethane resin immediately after pulling up the steering wheel was 2.1%.
  • the time required for the urethane resin removal operation in the second step was 22 minutes.
  • the swelling ratio of the urethane resin immediately after raising the steering wheel (within 1 minute) was 2.7%.
  • the time required for the operation of removing the urethane resin in the second step was 4 minutes.
  • Example 11 Al alloy cored bar + steering wheel of urethane resin coating layer having a specific gravity of 0.5 ⁇ medium temperature vegetable oil immersed for 15 minutes, coating layer removal work ⁇ cored bar degreasing cleaning
  • a medium temperature oil heating experiment was conducted in the same manner as in Example 7 except that a steering wheel comprising a foamed urethane resin coating layer having a specific gravity of 0.5 formed on the core metal surface by RIM molding was used.
  • the swelling ratio of the urethane resin immediately after raising the steering wheel (within 1 minute) was 2.0%.
  • the time required for the operation of removing the urethane resin in the second step was 5 minutes.
  • Example 12 Al alloy core metal + steering wheel of urethane resin coating layer having a specific gravity of 0.55 ⁇ immersion of medium temperature vegetable oil for 15 minutes, then removal of coating layer ⁇ core metal degreasing cleaning
  • a medium temperature oil heating experiment was conducted in the same manner as in Example 7 except that a steering wheel made of a foamed urethane resin coating layer having a specific gravity of 0.55 formed on the core metal surface by RIM molding was used.
  • the swelling ratio of the urethane resin immediately after pulling up the steering wheel was 2.1%.
  • the time required for the urethane resin removal operation in the second step was 22 minutes.
  • the first step was completed 20 minutes after the steering wheel was introduced. After completion of the first step, the swelling ratio of the urethane resin immediately after pulling up the steering wheel (within 1 minute) was 2.7%.
  • the coating layer (urethane resin) of the part and the boss part was removed (the core metal and the resin layer were separated, and the coating layer was recovered in this step), and the second step was completed.
  • the time required for removing the urethane resin was 4 minutes.
  • the recovered coating layer (urethane resin) can be used for industrial waste treatment or recycling.
  • a degreasing solvent oscillation frequency 28 KHz
  • the washing (drying) time of this step according to the above (1) to (3) was 15 minutes.
  • the collected metal core can be recycled for steering wheel manufacturing or alloy ingot manufacturing.
  • the degreasing solvent (cleaning liquid) used for the degreasing cleaning can also be used for industrial waste treatment or recycling after recovery.
  • the swelling ratio of the urethane resin immediately after raising the steering wheel (within 1 minute) was 2%.
  • the time required for the operation of removing the urethane resin in the second step was 11 minutes.
  • Example 15 (Mg alloy core + steer wheel of urethane resin coating layer with specific gravity of 0.55 ⁇ high temperature vegetable oil immersed for 20 minutes, then coating layer removal operation ⁇ core metal degreasing and cleaning)
  • the swelling ratio of the urethane resin immediately after pulling up the steering wheel was 2.1%.
  • the time required for the operation of removing the urethane resin in the second step was 10 minutes.
  • Example 16 Al alloy cored bar + steel wheel with urethane resin coating layer having a specific gravity of 0.4 ⁇ High temperature vegetable oil immersed for 20 minutes, then coating layer removal work ⁇ core metal degreasing and cleaning
  • a high-temperature oil heating experiment was conducted in the same manner as in Example 13 except that a steering wheel composed of a foamed urethane resin coating layer having a specific gravity of 0.4 formed on the core metal surface by RIM molding was used.
  • Example 17 Al alloy cored bar + steering wheel of urethane resin coating layer having specific gravity of 0.5 ⁇ high temperature vegetable oil immersed for 20 minutes, then coating layer removal work ⁇ cored bar degreasing
  • a high temperature oil heating experiment was conducted in the same manner as in Example 13 except that a steering wheel composed of a foamed urethane resin coating layer having a specific gravity of 0.5 formed on the core metal surface by RIM molding was used.
  • the swelling ratio of the urethane resin immediately after raising the steering wheel (within 1 minute) was 2.0%.
  • the time required for the operation of removing the urethane resin in the second step was 11 minutes.
  • Example 18 (Al alloy core + steer wheel of urethane resin coating layer having a specific gravity of 0.55 ⁇ high temperature vegetable oil immersed for 20 minutes, then coating layer removal operation ⁇ core metal degreasing and cleaning)
  • a high-temperature oil heating experiment was conducted in the same manner as in Example 13 except that a steering wheel composed of a foamed urethane resin coating layer having a specific gravity of 0.55 formed on the core metal surface by RIM molding was used.
  • the swelling ratio of the urethane resin immediately after pulling up the steering wheel was 2.1%.
  • the time required for the operation of removing the urethane resin in the second step was 10 minutes.
  • the swelling ratio of the urethane resin immediately after raising the steering wheel (within 1 minute) was 0%.
  • the time required for the operation of removing the urethane resin in the second step was 180 minutes.
  • Comparative Example 2 Al alloy core + urethane resin coating layer having a specific gravity of 0.4: steering wheel ⁇ after removing the coating layer after 10 minutes of warm water immersion
  • a hot water heating experiment was conducted in the same manner as in Example 1 except that a steering wheel comprising a cored bar and a coating layer made of urethane foam with a specific gravity of 0.4 formed on the surface of the cored bar by RIM molding was used. went.
  • the swelling ratio of the urethane resin immediately after raising the steering wheel (within 1 minute) was 0%.
  • the time required for the operation of removing the urethane resin in the second step was 18 minutes.
  • Example 19 (Mg alloy cored bar + urethane resin coating layer having a specific gravity of 0.4, steering wheel ⁇ medium temperature mineral oil immersed for 15 minutes, then coating layer removal work ⁇ cored bar degreasing)
  • A First step (a-1) As an experimental oil tank (container), 40 liters of vegetable oil was prepared in a cooking zundo (inner diameter 430 mm, depth 455 mm), and the vegetable oil was heated. . Waste oil of cutting oil was used as mineral oil.
  • the first step was completed 15 minutes after the steering wheel was introduced. After completion of the first step, the swelling ratio of the urethane resin immediately after pulling up the steering wheel (within 1 minute) was 2.7%.
  • the coating layer (urethane resin) of the part and the boss part was removed (the core metal and the resin layer were separated, and the coating layer was recovered in this step), and the second step was completed.
  • the time required for removing the urethane resin was 4 minutes.
  • the recovered coating layer (urethane resin) can be used for industrial waste treatment or recycling.
  • a degreasing solvent oscillation frequency 28 KHz
  • the washing (drying) time of this step according to the above (1) to (3) was 15 minutes.
  • the collected metal core can be recycled for steering wheel manufacturing or alloy ingot manufacturing.
  • the degreasing solvent (cleaning liquid) used for the degreasing cleaning can also be used for industrial waste treatment or recycling after recovery.
  • Example 20 Al alloy core + steer wheel of urethane resin coating layer having a specific gravity of 0.4 ⁇ middle temperature mineral oil immersed for 15 minutes, then coating layer removal operation ⁇ core metal degreasing and cleaning
  • a high temperature oil heating experiment was conducted in the same manner as in Example 19 except that a steering wheel composed of a foamed urethane resin coating layer having a specific gravity of 0.4 formed by RIM molding on the core metal surface was used.
  • the swelling ratio of the urethane resin immediately after raising the steering wheel (within 1 minute) was 2.7%.
  • the time required for the operation of removing the urethane resin in the second step was 4 minutes.
  • Example 21 (Mg alloy cored bar + urethane resin coating layer with specific gravity of 0.4 steering wheel ⁇ high temperature mineral oil immersed for 20 minutes, then coating layer removal work ⁇ cored bar degreasing)
  • A First step (a-1) As an experimental oil tank (container), 40 liters of vegetable oil was prepared in a cooking zundo (inner diameter 430 mm, depth 455 mm), and the vegetable oil was heated. . Waste oil of cutting oil was used as mineral oil.
  • the first step was completed 20 minutes after the steering wheel was introduced. After completion of the first step, the swelling ratio of the urethane resin immediately after pulling up the steering wheel (within 1 minute) was 2.7%.
  • the coating layer (urethane resin) of the part and the boss part was removed (the core metal and the resin layer were separated, and the coating layer was recovered in this step), and the second step was completed.
  • the time required for removing the urethane resin was 4 minutes.
  • the recovered coating layer (urethane resin) can be used for industrial waste treatment or recycling.
  • a degreasing solvent oscillation frequency 28 KHz
  • the washing (drying) time of this step according to the above (1) to (3) was 15 minutes.
  • the collected metal core can be recycled for steering wheel manufacturing or alloy ingot manufacturing.
  • the degreasing solvent (cleaning liquid) used for the degreasing cleaning can also be used for industrial waste treatment or recycling after recovery.
  • Example 22 Al alloy core + steer wheel of urethane resin coating layer with specific gravity of 0.4 ⁇ high temperature mineral oil immersed for 20 minutes, then coating layer removal operation ⁇ core metal degreasing and cleaning
  • a high temperature oil heating experiment was conducted in the same manner as in Example 19 except that a steering wheel composed of a foamed urethane resin coating layer having a specific gravity of 0.4 formed by RIM molding on the core metal surface was used.
  • the swelling ratio of the urethane resin immediately after raising the steering wheel (within 1 minute) was 2.7%.
  • the time required for the operation of removing the urethane resin in the second step was 4 minutes.
  • the alkaline stripping solution used contained 3.5 wt% potassium hydroxide, 2.5 wt% sodium hydroxide, 20 wt% anionic surfactant, and 40 wt% diethylene glycol monoethyl ether.
  • the temperature of the liquid used in each step was measured using a K thermocouple.
  • the steering wheel was composed of a core metal made of Mg—Al alloy (see FIGS. 2A and 2B) and a coating layer made of urethane foam (specific gravity 0.4) formed by RIM molding.
  • the time required from the pretreatment process to the completion of the removal work of the coating layer (urethane resin) in the seventh process was 212 minutes.
  • Evaluation criteria for “post-treatment” in Table 1 are as follows: ⁇ : No post-treatment with solvent ⁇ : Simple solvent treatment required ⁇ : Solvent treatment using extensive maintenance required ⁇ : Unusable.
  • the coating layer is removed by taking it out of the water or oil while being swollen and softened by impregnating with hot water or hot oil at a predetermined temperature.
  • the coating layer (urethane resin) could be removed from the steering wheel in a short time with high work efficiency.
  • the urethane resin is allowed to swell and soften in heated water or oil without being dissolved (peeled) using an alkali stripping solution or an acid stripping solution as in the comparative example.
  • the covering layer (urethane resin) can be easily removed in a short time by performing the urethane resin removal operation in such a state (hot, soft and sticky state).
  • Pretreatment process 13 First step, 15 Second step, 17 Third step, 21 Steering wheel, 21 'Steering wheel in swollen and softened state, 22 Rim part, 22 'swollen, softened rim, 23 coating layer, 23 'swollen, softened coating layer (urethane resin), 24 spokes, 24 'spokes in swollen and softened state, 25 Incised part cut in the pretreatment process, 25a Incised part cut in the second step, 27 water, 27 'oil, 29 Aquarium, 29 'oil tank, 31 Coil heater, 33 Core, 33a cored metal with oil attached, 35 Faucet, 37 Degreasing solvent.

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  • Manufacture And Refinement Of Metals (AREA)

Abstract

[Problème] Proposer un procédé d'élimination de l'uréthane d'un matériau composite métal-uréthane avec une efficacité de travail élevée et un temps de travail réduit. [Solution] En ce qui concerne un matériau composite (matériau composite métal-uréthane) comportant une âme et une couche de revêtement contenant une résine uréthanique déposée sur la surface de l'âme, ce procédé d'élimination de la couche de revêtement contenant la résine uréthanique (procédé d'élimination de l'uréthane) du matériau composite est caractérisé en ce qu'il implique une première étape dans laquelle on laisse le matériau composite métal-uréthane dans de l'eau ou de l'huile chauffée à une température prédéterminée pendant un temps prédéterminé et une deuxième étape qui est mise à exécution après la première étape et dans laquelle le matériau composite métal-uréthane est retiré de l'eau ou de l'huile et la couche de revêtement est éliminée dans un temps prédéterminé.
PCT/JP2012/079021 2011-11-11 2012-11-08 Procédé d'élimination de l'uréthane d'un matériau composite métal-uréthane WO2013069744A1 (fr)

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JP2011-247850 2011-11-11
JP2011247850A JP2013103158A (ja) 2011-11-11 2011-11-11 金属・ウレタン複合材からのウレタン除去方法

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KR102096361B1 (ko) * 2018-02-20 2020-04-06 한국기계연구원 조향핸들 박피 장치 및 방법

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06220245A (ja) * 1993-01-25 1994-08-09 Toyota Central Res & Dev Lab Inc ポリウレタン発泡複合体の剥離方法
JPH11277029A (ja) * 1998-03-27 1999-10-12 Ykk Corp 金属とポリウレタンから成る複合物から金属を回収する方法
JP2000037677A (ja) * 1998-07-22 2000-02-08 Oputeku:Kk 複合部材の回収再生方法
JP2004042026A (ja) * 2002-05-16 2004-02-12 Matsushita Electric Ind Co Ltd 金属−樹脂接合部の剥離方法および剥離装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06220245A (ja) * 1993-01-25 1994-08-09 Toyota Central Res & Dev Lab Inc ポリウレタン発泡複合体の剥離方法
JPH11277029A (ja) * 1998-03-27 1999-10-12 Ykk Corp 金属とポリウレタンから成る複合物から金属を回収する方法
JP2000037677A (ja) * 1998-07-22 2000-02-08 Oputeku:Kk 複合部材の回収再生方法
JP2004042026A (ja) * 2002-05-16 2004-02-12 Matsushita Electric Ind Co Ltd 金属−樹脂接合部の剥離方法および剥離装置

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