JP4787625B2 - Lubricating composition coated metal sheet - Google Patents

Description

  The present invention belongs to the technical field of a lubricating composition-coated metal sheet having excellent formability and excellent film removal properties, weldability, blocking resistance, and the like.

  The present invention relates to a lubricating composition-coated metal sheet having a coating layer formed from a lubricating composition on one or both sides of a metal sheet, and more specifically, mainly an alloyed hot-dip galvanized steel sheet, hot-rolled steel sheet, cold-rolled steel sheet, and plated steel sheet. Has excellent press formability (lubricity) without using lubricating oil for stainless steel plate, aluminum plate, titanium plate, copper plate, etc. Even when the lubricating composition-coated metal plates are laminated, the metal plates do not adhere to each other (blocking resistance), and the coating layer (film) remains on the metal plate. The weldability and adhesiveness of the metal plate are not greatly reduced, and hard coating scraps derived from the coating layer are unlikely to be generated on the molded metal plate or mold, and the moldability (lubricity) is excellent. Lubricating composition coated metal sheet It relates.

  Metal plate pressing is used in a very wide range of fields, from industrial products such as automobiles, home appliances, and office equipment to manufacturing daily necessaries such as beverage cans, sinks, and bathtubs. Occupies a great position. Usually, when press working is performed, lubrication and workability are improved by applying press oil (lubricating oil) in order to prevent scratches on the mold or metal plate surface due to poor lubrication. Yes. However, in recent years, in order to meet the needs of automobile weight reduction, for example, high-tension steel plates and aluminum alloy plates that are difficult to press compared to cold-rolled steel plates are increasingly used. Needs are increasing.

  In addition, when press oil is applied, the working environment deteriorates due to the scattering of the press oil. Recently, the environmental load has increased due to evaporation of organic solvents such as chlorine-based solvents used for cleaning press oil after molding. Problems have also been pointed out.

  Therefore, a coating layer with excellent lubricity is formed in advance on the surface of the metal plate as a method that can be expected to have excellent formability and prevent deterioration of the working environment and increase of environmental load such as press oil scattering and cleaning agent evaporation. How to do is known. This is a material maker that is a metal plate supplier, which is supplied after a coating layer is formed on the surface of the metal plate in advance (so-called pre-coating), and can be pressed without using lubricant when processing at the customer's site. It is. The following two types of known precoat materials are known.

  The first is a non-delaminating type pre-coated metal plate which is designed so that the resin coating layer is used as it is as a coating film in the final product with emphasis on the merit of simplification of the painting process and the like in the customer. In such a case, the coating layer remains on the metal surface even after press molding, resulting in poor electrical conductivity. After press molding, chemical conversion treatment, electrodeposition coating, welding, etc. cannot be applied, and press moldability (workability). In addition, there is a problem that it is technically difficult to combine the required properties such as chemical resistance, corrosion resistance, and scratch resistance as the final coating film.

  Secondly, the coating film in the final product is formed in a separate process, and a film removal type coating layer with excellent lubricity is formed, and in the alkaline degreasing process, which is a pretreatment of the coating process after press molding. It is designed to be removed. In this case, the removal of the coating layer can be carried out easily without any extra cost since an alkali degreasing process that has been conventionally incorporated in a metal plate coating line can be used.

  As the above prior arts, compositions having excellent lubricity and coated metal plates having excellent lubricity as described below have been proposed, but each has a problem.

  For example, as a non-delaminating-type coated metal plate, in Patent Document 1 (Japanese Patent Laid-Open No. H5-123648), chromium ions and / or in the base film of an aluminum or aluminum alloy plate are mainly used for the purpose of improving the formability. A technique is disclosed in which zirconium ions are contained, an organic ester-based lubricating oil is applied thereon, and a film is further formed thereon. This emphasizes improvement of molding processability and prevention of coating film peeling after molding, and is designed to use the coating layer as it is as the final coating film. However, in this prior art, since the adhesion between the aluminum plate and the coating layer is very high, it is difficult to remove the coating layer.For example, for applications where the coating layer must be removed after the molding process, such as chemical conversion treatment, painting, and welding treatment. There was a problem that was difficult to apply.

  On the other hand, as a film removal type coated metal plate, Patent Document 2 (Japanese Patent Laid-Open No. 2000-38539) discloses a water-soluble copolymer having styrene / methacrylic acid ester and a carboxyl group for the main purpose of improving the formability of the steel plate. A technology relating to an alkali film-removable film made of an acrylic resin as an essential component and an alkali film-removed lubricated steel sheet is disclosed, of which a methacrylic ester having a glass transition temperature of 0 ° C. or higher is introduced, and It is disclosed that excellent moldability can be obtained by copolymerizing a compound instead of a mixture. Although this prior art has a film removability by alkali cleaning, since it does not contain a lubrication imparting component, the lubricity is poor and the press formability is inferior.

  Patent Document 3 (Japanese Patent Publication No. 8-502089) discloses a technique relating to a metal that has been lubricated by forming a mixture of a fatty acid such as ethylene glycol monolaurate and a partial ester of glycol on a metal plate. It has been shown that alkali delaminating properties and certain moldability are obtained. However, the lubricating coating layer of this prior art is composed only of a soft low molecular weight compound, and the high pressure applied during press molding eliminates the soft lubricant from the processed surface, and direct contact between the mold and the workpiece is achieved. Since it becomes easy to occur, there existed a problem inferior to a moldability. Furthermore, when the metal plates coated with these compositions are laminated and stored, the coating layers easily adhere to each other depending on the storage conditions such as when the number of stacked sheets is large or in the tropical region or summer (blocking), Workability is inferior because it becomes difficult to take out the lubricant-coated metal plates one by one at the time of use, and even if the metal plate can be taken out, the amount of lubricant attached becomes non-uniform and stable formability cannot be obtained. was there.

  In order to improve such problems, Patent Document 4 (Japanese Patent Application Laid-Open No. 2001-172776) discloses a technique for combining an alkali film-removable film with a polyolefin-based, fluorine-based, paraffin-based, or stearic acid-based wax as a lubricant imparting agent. In Patent Document 5 (Japanese Patent Laid-Open No. 2002-371332), silica particles and a lubricant imparting agent are combined with an alkali film-removing film (polyethylene glycol, polypropylene glycol, polyvinyl alcohol, acrylic, polyester, etc.). Each technique is disclosed. These prior arts are a composite of an alkali-soluble / water-soluble resin and a lubricant, have alkali film-removing properties and certain moldability, and do not cause problems such as blocking, but are difficult to process. Moldability was still insufficient as a molding lubrication treatment technique.

  Furthermore, especially when the metal plate is an aluminum alloy material, the lubricant film layer that has fallen off due to the high pressure applied during press molding may become hard scrap and adhere to the upper mold, and a large number of parts can be continuously attached. In the case of molding, if the coating scrap falls on the part, it may cause wrinkles, and further improvement has been demanded.

  The removal of the film by alkali cleaning is performed using alkali-soluble film such as acrylic resin disclosed in the above prior art, polyvinyl alcohol, cellulose resin, polyacrylamide, polyvinylpyrrolidone, polyoxyethylene of various molecular weights, etc. Even a water-soluble film made of a water-soluble resin can be sufficiently realized.

  However, with respect to formability, a metal plate coated only with a composition composed of these was completely insufficient. Forming a coated metal sheet improves when a lubricant such as polyolefin, fluorine, paraffin, or stearic acid wax is combined with the composition comprising the alkali-soluble film or water-soluble resin. However, the improvement was limited to a limited range, and application to the problem of improving the formability of difficult-to-work materials such as aluminum alloy materials was still insufficient.

Furthermore, since many of these lubricating films have high hardness at room temperature, there is a problem that the peeled lubricating film may cause wrinkles, especially in the formation of aluminum alloy materials that are soft metals. It was.
JP-A-5-12648 Japanese Unexamined Patent Publication No. 2000-38539 Japanese National Patent Publication No. 8-502089 Japanese Patent Laid-Open No. 2001-172776 JP 2002-371332 A

  The present invention eliminates such conventional problems, is excellent in moldability (lubricity) and has a good film removal property, has high blocking resistance, and has sufficient weldability and adhesiveness, Furthermore, it is an object of the present invention to provide a high-quality film-dissolving-type lubricating composition-coated metal plate in which hard coating scraps derived from the resin coating layer are unlikely to be generated on the molded metal plate or mold.

  Therefore, as a result of intensive studies and experiments to achieve the above object, the present inventors have completed the following invention as an effective problem solving means.

  That is, the invention according to claim 1 is a metal plate in which a lubricating composition coating layer is formed on one or both surfaces of the metal plate surface, and the lubricating composition coating layer has an ethylene glycol skeleton in the molecule. Lubricant composed of one or more organic compounds whose melting peak temperature specified by JIS K7121 is 30 ° C or higher and 70 ° C or lower and the penetration specified by JIS K2235 at 25 ° C is 5 or higher and 100 or lower Containing the composition A and resin fine particles B having a melting peak temperature defined by JIS K7121 of 100 ° C. or higher and an average particle diameter measured by a laser diffraction / scattering method of 10 μm or less; A lubricating composition-coated metal plate, wherein the composition weight ratio of the lubricating composition A and the resin fine particles B in the layer is A> B.

    In the invention according to claim 2, the organic compound contained in the lubricating composition A is a copolymer of polyoxyethylene and polyoxypropylene, polyoxyethylene lauryl ether, polyoxyethylene monostearate, polyoxyethylene lanolin. 2. The lubricating composition-coated metal sheet according to claim 1, wherein the lubricating composition-coated metal sheet is at least one selected from fatty acid esters, polyoxyethylene lanolin alcohol esters, and polyoxyethylene.

    Next, the invention according to claim 3 is characterized in that the resin fine particles B are at least one selected from polyethylene wax, polypropylene wax, amide wax, and polytetrafluoroethylene. It is a metal plate coated with a lubricating composition having excellent lubricity.

  Further, the invention according to claim 4 is characterized in that the lubricating composition coating layer is formed on the surface of the metal plate at 0.1 g / m 2 or more and less than 2.0 g / m 2 per side. The lubricating composition-coated metal sheet having excellent lubricity as described in 1. above.

  According to the present invention, by adopting the above-described solution means, it is excellent in press formability (lubricity), has good film-removability, has high blocking resistance, and has sufficient weldability and a lubricating composition film. It is possible to provide a high-quality film-dissolving type lubricating composition-coated metal sheet that has a high degree of adhesion and is difficult to generate hard film scraps derived from the lubricating composition coating layer on a molded metal sheet or mold. It has a very advantageous effect that it becomes possible.

  Hereinafter, the contents of the present invention will be described clearly and in detail so that those skilled in the art can easily implement the contents.

  In the course of research, the inventors of the present invention have a lubricating composition-coated metal plate (including an alloy plate) excellent in lubricity in the present invention, and a lubricating composition coating layer (film) formed on various metal plates. Has an ethylene glycol skeleton in the molecule, a melting peak temperature of 30 ° C. or higher and 70 ° C. or lower, and a penetration defined by JIS K2235 at 25 ° C. of 5 or higher and 100 or lower. A lubricating composition A composed of the above organic compound and resin fine particles B having a melting peak temperature of 100 ° C. or higher and an average particle size of 10 μm or less are contained as essential components, and the composition weight ratio in the lubricating composition coating layer is lubricated. It has been found that satisfying the relationship of composition A> resin fine particles B is an important condition for achieving the object of the present invention.

  Since the lubricating composition A which is the first essential component in the lubricating composition coating layer of the present invention has an ethylene glycol skeleton in the molecule, the lubricating composition A has a low friction coefficient and excellent lubricity. In addition, since it exhibits water solubility and hydrophilicity, the lubricating composition coating layer after the molding process can be easily removed by washing with water or alkali, that is, it has an advantage of excellent film removal.

  The lubricating composition A having an ethylene glycol skeleton in the molecule that can be applied to the present invention needs to be an organic compound having a melting peak temperature of 30 ° C. or higher and 70 ° C. or lower. When the melting peak temperature of the lubricating composition A is less than 30 ° C., most of the lubricating composition coating layer melts and liquefies in a normal storage environment. It is not preferable because fusion is likely to occur and the coating layer may drop off or the amount of adhesion may change. A more preferable melting peak temperature is 35 ° C. or higher, most preferably 40 ° C. or higher.

  In addition, the lubricating composition A having an ethylene glycol skeleton in the molecule that can be applied to the present invention needs to have a penetration of 5 or more and 100 or less as defined by JIS K2235 at 25 ° C. When the penetration is 100 or more, since the coating layer is too soft, the coating layer is easily peeled off due to physical contact or the like, and the coating layer is easily damaged during press molding. Further, the coating layer is likely to be removed due to the high pressure that is exposed during molding, and there is a problem that moldability is lowered.

  On the other hand, a part of the lubricating composition coating layer inevitably peels off due to a high pressure exposed during molding, and may adhere to a mold or the like, but the penetration of the composition A is 5 or less. In this case, since the deposits derived from the coating layer are hard, there is a problem that may cause wrinkles for relatively soft metals such as aluminum alloy materials, which is not preferable.

  As the compound name of the organic compound contained in the lubricating composition A of the present invention, a copolymer of polyoxyethylene and polyoxypropylene, polyoxyethylene lauryl ether, polyoxyethylene monostearate, polyoxyethylene lanolin fatty acid ester, Polyoxyethylene lanolin alcohol ester, polyoxyethylene alkyl ether phosphate ester salt, polyoxyethylene decyl ether, polyoxyethylene dodecyl ether, polyoxyethylene myristyl ether, polyoxyethylene ceyl ether, polyoxyethylene stearyl ether, polyoxyethylene Isostearyl ether, polyoxyethylene octyl (2-ethylhexyl) ether, polyoxyethylene octyldodecyl ether, polyoxyethylene Mashi oil ether, polyoxyethylene lanolin alcohol ether, polyoxyethylene lauryl ether, polyoxyethylene nonylphenyl ether, polyoxyethylene sorbitan monostearate, polyoxyethylene sorbitan tristearate, polyoxyethylene monostearate, polyoxyethylene Mention may be made of distearate, polyoxyethylene monooleate, polyoxyethylene alkylamine, polyoxyethylene / polyoxypropylene alkylamine, polyoxyethylene higher fatty acid monoethanolamide, or mixtures thereof.

  Among them, particularly excellent ones are copolymers of polyoxyethylene and polyoxypropylene, polyoxyethylene lauryl ether, polyoxyethylene monostearate, polyoxyethylene lanolin fatty acid ester, polyoxyethylene lanolin alcohol ester, polyoxyethylene or Mention may be made of these mixtures.

  Polyoxyethylene is sometimes referred to as polyethylene oxide, polyethylene oxide, polyethylene glycol, or the like. All of these have the same chemical structure containing many ethylene glycol skeletons in the molecule, and can be handled in the same manner as polyoxyethylene. In the present invention, these organic compounds are collectively referred to as polyoxyethylene.

  The fine resinous resin B, which is the second essential component in the lubricating composition coating layer of the present invention, has a melting peak temperature of 100 ° C. or more and an average particle size of 10 μm or less, and is a first essential component that coexists in the coating layer. It is essential that it exists in the weight ratio which does not exceed the lubricating composition A which is. Examples of the compound name of the resin fine particles B contained in the lubricating composition include polyethylene wax, polypropylene wax, amide wax, and polytetrafluoroethylene. In the lubricating composition-coated metal plate of the present invention, the lubricating composition A is designed to be relatively soft from the viewpoint of preventing wrinkles derived from film scraps generated during molding. The inclusion of the resin fine particles B having the types, particle sizes, and melting points within the range of the present invention in the coating layer reduces the elimination of the lubricating composition coating layer during press molding. In addition, since the direct contact between the lubricating composition-coated metal plate and the mold can be prevented, extremely high formability and anti-fouling property can be provided. In addition, although the average particle diameter in this invention is displayed with the D50 value measured by the laser diffraction / scattering method, it can also be measured by the Coulter counter method or the like.

  When the resin fine particle B has a melting peak temperature of less than 100 ° C., when the lubricating composition coating layer is formed by application of an aqueous paint, the resin fine particle is melted by heat necessary for evaporation removal of the aqueous solvent, This is not preferable because the particulate form cannot be maintained. In consideration of productivity in the case of continuous coating, it is preferable that the heating temperature of the metal plate is 100 ° C. or higher. Therefore, a higher melting peak temperature is preferable, 120 ° C. or higher, more preferably 140 ° C. or higher. It is preferable that

  When the average particle diameter of the resin fine particles B exceeds 10 μm, the particles are not easily removed from the coating layer. Although resin microparticles of 0.3 μm or less that satisfy the requirements of the present invention were not available, it has not been verified, but it is difficult to expect the effect of improving moldability because the particles are easily embedded in the coating layer of the lubricating composition. It is. The preferred average particle size is less than 8 μm, more preferably less than 6 μm.

  It is essential that the resin fine particles B are present in the lubricating composition coating layer in a weight ratio that does not exceed the lubricating composition A that is the first essential component in the coating layer. When the abundance ratio of the resin fine particles B exceeds the range of the present invention, the particles fall off from the coating layer, and improvement in moldability cannot be expected. In addition, when forming the coating layer, the workability is also lowered, such as an increase in the viscosity of the paint and a deterioration in the dispersibility.

  In the lubricating composition-coated metal plate of the present invention, the amount of the lubricating composition coating layer formed on the metal plate, that is, the adhesion amount of the lubricating composition is preferably 0.1 g / m2 or more and less than 2.0 g / m2 per side, It is preferably 0.3 g / m 2 or more and less than 1.5 g / m 2, most preferably 0.5 g / m 2 or more and less than 1.2 g / m 2. When the adhesion amount of the lubricating composition is lower than the lower limit value of the present invention, the metal plate and the mold are likely to be in direct contact with each other, so that sufficient formability cannot be obtained. Not only can it not be expected to improve formability due to saturation, but it also tends to cause peeling of the coating film during press molding, and the scrap of the lubricating layer tends to accumulate on the mold, contributing to molding defects, This is not preferable because weldability and blocking resistance are greatly deteriorated.

  The amount of adhesion of the lubricating composition can be determined by measuring the weight of the metal plate in advance before forming the coating layer and subtracting the weight of the metal plate from the total weight after forming the coating film. When the size of the metal plate is large, or when painting continuously on a factory line etc., calibration curves created by gravimetric method and quantitative value of carbon content by X-ray fluorescence analysis, or CH stretching by infrared absorption spectrum It can be obtained by comparing the intensity of a characteristic absorption peak such as vibration.

  The lubricating composition-coated metal sheet in the present invention includes a metal band that is a band-shaped metal sheet, and is not particularly limited, but is not limited to hot dip galvanized steel sheet, galvannealed steel sheet, hot rolled steel sheet, cold rolled steel sheet. Electrogalvanized steel sheet, electric Zn-Ni plated steel sheet, stainless steel sheet, aluminum plate, various aluminum alloy plates, and titanium plate can be exemplified.

  In the present invention, in order to obtain further corrosion resistance and adhesion, the base is subjected to phosphate treatment, chromate treatment, pickling treatment, alkali treatment, electrolytic reduction treatment, cobalt plating treatment, nickel plating treatment, silane coupling agent treatment, inorganic silicate. Processing may be performed.

  The method for producing the lubricating composition-coated metal sheet of the present invention is not particularly limited, and a known method can be applied. For example, an aqueous paint prepared by dissolving and dispersing a lubricating composition in an aqueous solvent is applied to the surface of a metal plate by a method such as roll coating, spray coating, dip coating, or brush coating, and then heated and dried. A lubricating composition coating layer can be formed.

  The water-based paint is obtained by dissolving and dispersing the constituents of the lubricating composition in an aqueous solvent. Among these, the lubricating composition A having an ethylene glycol skeleton is dissolved and the resin fine particles B are dispersed. ing. In the paint, water is mainly used as a solvent, but an aqueous organic solvent that is compatible with water may be used in combination for the purpose of improving the stability and film-forming property of the paint. Examples of water-based organic solvents used include alcohols such as methanol, ethanol, isopropanol and butanol, ether alcohols such as methyl cellosolve and ethyl cellosolve, ketones such as acetone, methyl ethyl ketone and methyl isobutyl ketone, ethylene glycol and propylene glycol, etc. These glycols and their glycol ethers and glycol esters are exemplified, but not limited thereto.

  The viscosity of the water-based paint is not particularly limited, and may be appropriately determined according to the target paint film thickness and paint film forming method / apparatus. The lubricating composition-coated metal plate of the present invention can be obtained by applying the coating material on one or both surfaces of the metal plate and then performing a drying process.

  Alternatively, since the lubricating composition of the present invention becomes liquid when heated as it is without dissolving / dispersing in an aqueous solvent, the lubricating composition coating layer is formed on the surface of the metal plate by cooling it after electrostatic oiling. It can also be formed. The electrostatic oiling method is not particularly limited, but the heating temperature is preferably 70 ° C. or higher and lower than 100 ° C. in order that the lubricating composition A melts and the resin fine particles B maintain the particle shape.

Further, the lubricating composition coating layer formed on the lubricating composition-coated metal plate of the present invention includes various components such as carnauba wax, microcrystalline wax, and paraffin wax in addition to the components of the lubricating composition A and resin fine particles B described above. Lubricating agent, conductive additive that imparts conductivity, surfactant, thickener, antifoaming agent, dispersant, drying agent, stabilizer, anti-skinning agent, anti-fungal agent, antiseptic, anti-freezing agent Can be contained in combination as appropriate within a range that does not impair the various properties of the lubricating composition-coated metal sheet of the present invention.
[Example]
Hereinafter, the present invention will be described more specifically with reference to examples and comparative examples, and the excellent effects will be demonstrated.
Example 1
CERAFLOUR961 as resin fine particles B, 4.0 g of New Pole 62 as an organic compound constituting the lubricating composition A, and 4.0 g of New Pole 68 (both polyoxyethylene and polyoxypropylene copolymer, manufactured by Sanyo Chemical Co., Ltd.) A coating composition was prepared by dissolving and dispersing 2.0 g (manufactured by Big Chemie / polyethylene wax particles) in 90.0 g of distilled water heated to about 70 ° C. The new poles 62 and 68 and CERAFLOUR 961 also show their physical properties (melting peak temperature, penetration, average particle size) as a, b and k in Table 1, respectively.

  Next, the coating composition prepared by the above method was applied to both sides of a 5J32 aluminum alloy plate (180 x 110 x 1 mm) with a No. 5 bar coater and then dried at 110 ° C for 3 minutes using a hot air dryer. By forming the layer, a lubricating composition-coated metal plate was produced.

  The produced coated metal sheet was evaluated for formability, film scrap generation, film removal, weldability, and block king resistance. The evaluation method is shown below, and the evaluation results are shown in Table 3. Moreover, the melting peak and penetration of the lubricating composition A excluding the resin fine particles B in the coating layer were measured. The evaluation method is shown below, and the results are shown in Table 2.

(Examples 2 to 24)
Hereinafter, a lubricating composition-coated metal plate was produced in the same manner as in Example 1, and its performance was evaluated. The applied components are shown in Table 1, the applied metal plate type, the configuration of the coating layer and the physical properties thereof are shown in Table 2, and the evaluation results of the lubricating composition-coated metal plate are shown in Table 3, respectively.

Similarly, Reference Examples 1 and 2 are also shown in Tables 1 to 3.
(Comparative Examples 1 and 2)
5J32 aluminum alloy plate (180 × 110 × 1mm) or mild steel plate (SPCC, 180 × 110 × 1mm) on both sides, prepared with 1.0g / m2 of cleaning oil (R303PX2, made by Sugimura Chemical Co., Ltd.) did. This oil-coated aluminum plate was evaluated in the same manner as in Example 1. The results are shown in Table 3.
(Comparative Examples 3 to 12)
A lubricating composition-coated metal plate was prepared in the same manner as in Example 1, and its performance was evaluated. The applied structural components are shown in Table 1, the applied metal plate type and the configuration and physical properties of the coating layer are shown in Table 2, and the evaluation results of the coated metal plate are shown in Table 3, respectively.

With respect to the examples within the scope of the present invention and the comparative examples other than the scope of the present invention, the formability of the lubricating composition-coated metal sheet, the state of film scrap generation, film removal, blocking resistance, and weldability were investigated. The results are shown in Table 3. Each characteristic was evaluated as follows.
Evaluation of formability The evaluation of formability was carried out by using the above-mentioned lubricating composition-coated metal plate having a lubricating composition coating layer formed on both sides, using a 1M080L 80-ton hydraulic press manufactured by Amino, with a hemispherical diameter (Dp) of 50.8 mmφ. Using a punch tool, the outer circumference was constrained with a lock bead with a crease holding force (P) of 200 kN, and the molding height was measured when stretched (press speed 4 mm / sec) until the test piece broke. . Evaluation was performed at N = 3, and the average value was defined as LDH ₀ (mm).
Evaluation of film scraps For the evaluation of film scraps, a lubricating composition-coated metal plate (horizontal length 25 mm, vertical width 200 mm, thickness 1 mm, 6K21 aluminum alloy material) with a lubricating composition coating layer formed on both sides was applied to the test piece. Then, using a Shimadzu TYPE EHF-U2H-20L type tensile tester, the test piece was sandwiched between cast iron flat plate drawing tools (contact area: 125 mm ² = length 5 mm x width 25 mm). The state of adhesion of film scraps on the metal plate and the tool when pulled out at a speed of 300 mm / sec while being pressed with a pressing force (P) of 78.4 MPa was visually observed. Less change compared to before pulling out or a film with a uniform film remaining, ○, a film with a little film scrap, △, a film on a metal plate is peeled off, or a film is attached to a tool What was done was made into x.
Evaluation of film removal property Evaluation of degreasing property was performed by using a 100 × 100 × 1 mm 6K21 aluminum alloy or mild steel test piece with a lubricating composition coating layer formed on one side and a fine cleaner L4460 maintained at 40 ° C. After soaking in a 3% solution (manufactured by Nihon Parkerizing Co., Ltd.) for 2 minutes, the water wetting rate after washing with water for 1 minute was evaluated visually, ○: water wetting rate of 80% or more, Δ: water wetting rate of 50-80 %, X: Evaluation was made in three stages with a water wetting rate of less than 50%.
Weldability evaluation Weldability was evaluated by adding a lubricating composition coating layer to a 6K21 aluminum alloy material (30 x 100 x 1 mm) on both sides with a coating weight of 0.8 g / m2 (per side). Pressure: 2.9kN, energization: Continuous 30-point spot welding at 29kA × 4cycle, measure the welding strength at the 30th point, the average welding strength is 2.9kN or more ◎, 2.7kN or more ○, 2.0kN or more 2.7 A value less than kN was evaluated as Δ, and a value less than 2.0 kN or incapable of welding was evaluated as ×.
Evaluation of blocking resistance The blocking property was evaluated by using two 100 x 100 x 1 mm 6K21 aluminum alloy or mild steel test pieces with a lubricating composition coating layer on one side. A 10 MPa load was applied in an overlapping manner and maintained at 40 ° C. for 2 hours. After releasing the pressure and gradually cooling to room temperature. The presence or absence of adhesion between the plates and the transition state of the coating layer of the lubricating composition from the coating surface to the metal surface were observed with the naked eye, ◎: No adhesion or migration, ○: Mild adhesion but easy peeling In addition, the evaluation was made in four stages: one having no transition of the lubricating composition coating layer, Δ: one having a slight transition of the lubricating composition coating layer, and x: one having the plate adhered and not being peeled off by its own weight. .
<Evaluation Method of Resin Composition A> (Table 2)
Evaluation of Melting Peak Temperature Regarding the constituent components of the lubricating composition A, the melting peak temperature was measured with a differential scanning calorimeter (DSC). When the lubricating composition A was composed of a plurality of types of compounds, a sample that was stirred until it became homogeneous after heating and melting was used as a sample. The measuring method was performed in accordance with JIS K7121, and the measurement was performed at a heating rate of 10 ° C./min. For the melting peak temperature, the temperature at the apex of the DSC curve was read. When a plurality of melting peaks were observed, each peak temperature was listed.
Evaluation of penetration The penetration at 25 ° C. was measured for the components of the lubricating composition A. When the resin composition A was composed of a plurality of types of compounds, a sample that was stirred until it became homogeneous after heating and melting was used as a sample. The measuring method was measured by an apparatus and method compliant with JIS K2235.

As described above, from the various evaluation results in the examples and comparative examples of Table 3, the lubricating composition-coated metal plate according to the present invention is formable (lubricating), film removal, blocking resistance, weldability and molding. It is clear that it is excellent in any of the residual film debris prevention characteristics later, and therefore, it has an excellent invention that is excellent in industrial value as a pre-coated metal plate that does not use a lubricating oil that adversely affects the environment. I can say that.

Claims (4)

  A metal plate having a lubricating composition coating layer formed on one or both surfaces of the metal plate surface, the lubricating composition coating layer having an ethylene glycol skeleton in the molecule, and a melting peak temperature defined in JIS K7121 Is defined as JIS K7121 and a lubricating composition A composed of one or more organic compounds having a penetration of 5 or more and 100 or less as defined in JIS K2235 at 25 ° C. The resin composition contains resin fine particles B having a melting peak temperature of 100 ° C. or higher and an average particle diameter measured by a laser diffraction / scattering method of 10 μm or less, and the lubricating composition A and the resin fine particles in the lubricating composition coating layer A lubricating composition-coated metal plate, wherein the constituent weight ratio of B is A> B.   The organic compound contained in the lubricating composition A is a copolymer of polyoxyethylene and polyoxypropylene, polyoxyethylene lauryl ether, polyoxyethylene monostearate, polyoxyethylene lanolin fatty acid ester, polyoxyethylene lanolin alcohol ester, The lubricating composition-coated metal sheet according to claim 1, wherein the metal sheet is at least one selected from polyoxyethylene.   3. The lubricating composition-coated metal having excellent lubricity according to claim 1, wherein the resin fine particles B are at least one selected from polyethylene wax, polypropylene wax, amide wax, and polytetrafluoroethylene. Board. The lubricating composition-coated metal sheet according to any one of claims 1 to 3, wherein the lubricating composition coating layer is formed on the surface of the metal sheet at a rate of 0.1 g / m2 or more and less than 2.0 g / m2 per side.