JP6296662B2 - Lubricating aluminum paint - Google Patents

Description

  The present invention relates to a lubricious aluminum coating material that is mounted on an electronic device and used for an optical drive that irradiates an optical disc such as a compact disc (CD) with laser light and reads data by reflected light.

  Electronic devices such as personal computers, CD players, and DVD players are equipped with optical drives. An optical drive is a storage device for an optical disk that uses a laser beam to read recorded information, and a CD (compact disk) drive, a DVD (digital versatile disk) drive, a BD (Blu-ray disk) drive, and the like are known. . In such an optical drive, data in the optical disk is read by a pickup lens that irradiates a laser beam onto an optical disk that is rotated by a spindle motor built in the optical drive and reads information from the reflected light.

  Various functional parts are provided inside the optical drive. As movable parts, for example, a module for rotating an optical disk, a module for inserting and removing a tray, a pickup module for irradiating a laser beam on the optical disk, and the like are provided. The electronic components include a unit that controls these modules, a unit that compresses / decodes data on the optical disc and generates a predetermined data string, and a unit that serves as an interface with a computer. An optical drive case is formed by combining an upper cover and a bottom cover.

A molded product obtained by press-molding a metal plate is used as a case for storing these functional parts. A molded product obtained by press-molding a metal plate is also used for the traverse base in the optical drive.
With the spread of notebook computers with built-in optical drives and portable type optical drives, optical drives are also required to be lighter, and aluminum plates have been used for upper covers, bottom covers, and traverse bases.

When these parts are molded using bare aluminum plates, a high-viscosity press oil requires a degreasing process using an organic solvent, etc. In order to omit it, a low-viscosity volatile press oil has been used.
However, when a bare aluminum plate is formed using volatile press oil, there is a problem in that cracks occur in the high-processed portion and scuffing occurs due to abrasion with the mold. On the other hand, it is known that formability is improved by using an aluminum coating material obtained by coating a metal plate with a paint containing a lubricant. For example, in Patent Document 1, the amount of adhesion is 10 to 50 mg / m ² in terms of Cr or Zr from at least one side of an aluminum base plate having an arithmetic average roughness Ra of 0.2 to 0.6 μm from the base plate side. An aluminum plate for electronic devices is disclosed in which a corrosion-resistant film containing Cr or Zr and a resin film containing 1 to 25% by mass of a lubricant with respect to the total resin film amount are sequentially formed.

JP 2003-313684 A

In recent years, with the reduction in cost and further weight reduction of notebook personal computers and the like, there has been a demand for further weight reduction and thinning of constituent materials of optical drive components. In order to meet such demands, the present inventors have reduced the thickness of the aluminum base plate of the aluminum plate for electronic devices described in Patent Document 1, and even if the resin film contains a lubricant, press formability is reduced. It has been found that a new problem arises that, for example, the desired flatness and appearance quality may not be obtained.
Further, the upper cover and the bottom cover need to have conductivity after assembly. However, not only that, but with the thinning of the optical drive, it is demanded that the conductivity be uniform even when the leaf spring comes in light contact. However, in the aluminum plate for electronic devices disclosed in Patent Document 1, the hardness of the resin film is not controlled, and the resin film is deformed at a portion where the resin film is thick so that a portion between the corrosion-resistant film and the spherical terminal is partially formed. It has also been found that the conductivity may be locally reduced due to filling.
Furthermore, the traverse base may tilt and come into contact with the tray outlet when an excessive force is applied to the tray when the optical disk is inserted and removed after assembly. If the tray outlet contacts the traverse base and the resin film is scraped off, the metal may contact the tray outlet and the tray may be deformed. For this reason, in recent years, wear resistance has been required for resin films for traverse bases.

In view of the problems in the conventional technology as described above, an object of the present invention is to provide an aluminum coating material that is excellent in slidability with a mold and can ensure good press formability. The present invention further desirably provides an aluminum coating material capable of ensuring uniform conductivity even under a light load. Furthermore, it aims at provision of the aluminum coating material excellent in a moldability and abrasion resistance.

  In order to solve the above-mentioned new problems, the inventors of the present invention diligently studied focusing on the surface characteristics of the resin film and the chemical film, and found that the profile of the convex portion formed on the chemical film and the surface of the resin film It has been found that when combined with the polar component of energy, the uniform casting property of the low-viscosity volatile press oil and the sliding property with the mold can be improved at the same time. Further, it has been found that when the thickness of the resin film is specified in addition to the profile of the convex portion and the polar component of the surface energy, uniform conductivity is exhibited without impairing moldability and slidability. Furthermore, it has been found that if the thickness of the resin film is specified in addition to the profile of the protrusions formed on the chemical conversion film and the polar component of the surface energy of the resin film, the moldability and wear resistance are improved. The present invention has been made based on such findings, and the object of the present invention has been achieved by the following means.

（２）前記樹脂皮膜が、ビスフェノール型エポキシ樹脂またはビスフェノール型変性エポキシ樹脂と、尿素樹脂またはフェノール樹脂とによる硬化皮膜であることを特徴とする（１）に記載の潤滑性アルミニウム塗装材。
（３）前記樹脂皮膜が、ビスフェノール型ニトリル変性エポキシ樹脂の硬化皮膜であることを特徴とする（１）に記載の潤滑性アルミニウム塗装材。
（４）前記樹脂皮膜が、ビスフェノール型エポキシ樹脂又はビスフェノール型ニトリル変性エポキシ樹脂と、ベンゾグアナミン樹脂とによる硬化皮膜であることを特徴とする（１）または（３）に記載の潤滑性アルミニウム塗装材。
（５）前記樹脂皮膜の平均膜厚が、０．３〜８．０μｍであることを特徴とする（１）〜（４）のいずれか１項に記載の潤滑性アルミニウム塗装材。
（６）前記樹脂皮膜の平均膜厚が、０．３〜１．７μｍであることを特徴とする（１）〜（５）のいずれか１項に記載の潤滑性アルミニウム塗装材。
（７）前記樹脂皮膜の平均膜厚が、０．３〜０．８μｍであることを特徴とする（１）〜（６）のいずれか１項に記載の潤滑性アルミニウム塗装材。
（８）前記樹脂皮膜の平均膜厚が、１．７〜８．０μｍであることを特徴とする（１）〜（５）のいずれか１項に記載の潤滑性アルミニウム塗装材。 (1) An aluminum coating material having a chemical film on at least one surface of an aluminum material and a resin film on the chemical film, wherein an arbitrary 0.8 mm square region on the surface of the chemical film is formed on the aluminum material. In the divided region divided into two equal parts in the vertical direction of rolling , the projected area occupied area ratio, which is obtained by the following method for calculating the projected area occupied area ratio (large area of projected areas) / (small area of projected areas) is 1. The surface energy polar component (γ) in the range of 0 to 3.2 and obtained by solving the following three simultaneous equations in the evaluation of the surface free energy of the resin film by the following Owens-Wendt method: lubricating aluminum coating ^{material h} _s) is characterized in that it is a 0.1~3.6mN / m.
[Calculation method of projected area ratio]
An arbitrary 0.8 mm square region is set on the surface of the chemical conversion film, and a two equally divided region is formed by dividing the aluminum material into two equal parts in the rolling vertical direction. The ratio of the projected area occupied by Sa / Sb, which is the ratio of the relatively small area Sb of the projected area to the relatively large area Sa, is calculated. At this time, as a method for calculating the projected area occupied area ratio, Lasertec Co., Ltd. Using the “Confocal Microscope HD100 (trade name)”, an arbitrary 0.8 mm square area is set on the surface of the chemical conversion film provided on the aluminum plate with an objective lens of 200 ×, and these arithmetic average roughnesses are set. The three-dimensional image is observed with the portion higher than the arithmetic average roughness as the convex portion, and the entire 0.8 mm square region is further divided equally into 40 × 40 to be divided into a total of 1600 sections. A divided area is set, and in each of the two equal divided areas, a total of 800 subdivided areas of 20 (number of sections in the rolling direction) × 40 (number of sections in the width direction) are set. In each of the two equally divided areas among the subdivided areas, the number of sections (n) including the convex portions in each of the total 800 subdivided areas is calculated, and the number of sections (n ) Is multiplied by the area per section to calculate the area including the convex portion (S = n × (arbitrary area) / (number of subdivision areas) = n × 0.8 × 0.4 / 800 · (1)), the area including the convex portion thus obtained was calculated for any 20 other regions of the 0.8 mm square region, and thus obtained. The arithmetic average of Sa / Sb is the final convex area occupied area ratio Sa (large area of convex parts) / Sb (convex And small area) of the calculation method of protrusions filling ratio.

(2) The lubricating aluminum coating material according to (1), wherein the resin film is a cured film made of a bisphenol type epoxy resin or a bisphenol type modified epoxy resin and a urea resin or a phenol resin.
(3) The lubricating aluminum coating material according to (1), wherein the resin film is a cured film of a bisphenol type nitrile-modified epoxy resin.
(4) The lubricating aluminum coating material according to (1) or (3), wherein the resin film is a cured film made of a bisphenol-type epoxy resin or a bisphenol-type nitrile-modified epoxy resin and a benzoguanamine resin.
(5) The lubricating aluminum coating material according to any one of (1) to (4), wherein an average film thickness of the resin film is 0.3 to 8.0 μm.
(6) The lubricating aluminum coating material according to any one of (1) to (5), wherein an average film thickness of the resin film is 0.3 to 1.7 μm.
(7) The lubricating aluminum coating material according to any one of (1) to (6), wherein an average film thickness of the resin film is 0.3 to 0.8 μm.
(8) The lubricious aluminum coating material according to any one of (1) to (5), wherein an average film thickness of the resin film is 1.7 to 8.0 μm.

The aluminum coating material of the present invention has a low viscosity applied by uniform convex portions on the surface of the chemical conversion film, even if the aluminum material is thinned or the resin film does not contain a lubricant as in Patent Document 1. Volatile press oil is cast evenly on the surface of the resin film, and it has excellent slidability with the mold due to the polar component of the surface energy within a specific range. The material can be plastically deformed in an appropriate state to ensure good press formability. Therefore, the aluminum coating material of this invention is excellent in slidability with a metal mold | die, and is excellent in the flatness and external appearance quality after press molding.
Moreover, by making the film thickness of the resin film into a specific range, when the steel ball is pressed, the resin film having a predetermined coating film hardness is hardly deformed, and excellent conductivity is obtained.
The above and other features and advantages of the present invention will become more apparent from the following description, with reference where appropriate to the accompanying drawings.

FIG. 1 is a schematic diagram of a method for dividing the area occupied by the projected area.

  The lubricating aluminum coating material of the present invention has a chemical conversion film on the surface of at least one surface of an aluminum material (hereinafter also referred to as an aluminum plate), and has a resin film on the chemical conversion film.

A. Aluminum plate Although the material of the aluminum plate used for this invention is not specifically limited, 5000 series aluminum alloy is suitable. The thickness of the aluminum plate is selected in accordance with the design of the optical drive, but is preferably in the range of 0.12 to 0.80 mm, and preferably 0.15 to 0.64 mm, in order to sufficiently meet the recent thinning. A range is preferred. The Vickers hardness of the aluminum plate is preferably 70 to 95. When the Vickers hardness of the aluminum plate is in the above range, the flatness after press molding and the appearance of the bent portion in press molding are excellent.
Since the surface shape of the aluminum plate affects the surface shape of the chemical conversion film in the lubricating aluminum coating material of the present invention, the surface roughness (arithmetic average roughness Ra) is 0.15 to 0.45 μm. It is preferable to use the roll which has for the roll of the last pass in a cold rolling process.
In addition, as a method of adjusting the surface shape of a rolling roll, grinding | polishing or shot blasting, electric discharge machining, laser machining, etc. are mentioned. Moreover, it is preferable to adjust the rolling reduction of the last pass in a cold rolling process to 10 to 55%, and to adjust the viscosity of rolling oil to 2.2 to 5.8 cSt. Furthermore, it is preferable to perform annealing or stabilizing heat treatment after cold rolling. In addition to the surface shape of the rolling roll, the surface shape of the aluminum plate is affected by the shape and distribution of oil pits and the crystal state of the aluminum surface layer.
By these, arithmetic mean roughness Ra of the surface roughness of an aluminum plate can be adjusted to the preferable range of 0.14-0.48 micrometer.

B. Chemical conversion film The aluminum coating material of the present invention has a chemical conversion film on an aluminum plate. That is, a chemical conversion film is formed on the surface of the aluminum plate before the resin film is formed on the aluminum plate.
In forming the chemical conversion film, it is preferable to perform a degreasing treatment in order to remove dirt on the surface of the aluminum plate and adjust the surface properties. As the degreasing treatment, for example, treatment with caustic soda, sodium phosphate, sodium silicate, or the like, so-called alkali cleaning is preferable. About the degreasing process by such washing | cleaning, it sprays a predetermined | prescribed surface treatment liquid to an aluminum plate, or is given by immersing an aluminum plate in a process liquid for a predetermined time at a predetermined temperature. Next, it is preferable to perform acid cleaning for the purpose of removing smut generated by degreasing treatment, particularly alkali cleaning. Although it does not specifically limit as an acid, For example, a sulfuric acid, nitric acid, etc. are mentioned, Especially 0.5-5.0 mass% sulfuric acid is preferable.

Although it does not specifically limit as a chemical conversion film, It is preferable to use the chromate chemical conversion film formed with the phosphoric acid chromate processing liquid, and the non-chromate chemical conversion film formed with the non-chromate processing liquid in consideration of the environmental problem. The non-chromate chemical conversion film is not particularly limited, but it is preferable to use a zirconium phosphate chemical conversion film or a zirconium-molybdenum chemical conversion film. Coating of Cr or Zr in conversion coating is measured with a fluorescent X-ray is preferably 5~45mg / ^{m 2} of Cr equivalent amount, to be 0.5-15 / ^{m 2} in terms of Zr content preferable. If the Cr equivalent is less than 5 mg / m ² or the Zr equivalent is less than 0.5 mg / m ² , the corrosion resistance may be inferior, and the Cr equivalent exceeds 45 mg / m ² or the Zr equivalent exceeds 15 mg / m ² . In some cases, the color tone may be inferior.
In addition, as thickness of a chemical conversion film, it is obtained by observing a cross section with a transmission electron microscope, 5-100 nm is preferable and 8-50 nm is more preferable.

  Such a chemical conversion treatment is performed by spraying a predetermined chemical conversion treatment liquid on the aluminum plate or immersing the aluminum plate in the treatment liquid at a predetermined temperature for a predetermined time.

B-1. The shape of the chemical film surface (a) The surface roughness of the chemical film The chemical film was measured by measuring the surface with a stylus type surface roughness measuring instrument, and calculating the average value when 10 points were measured Rmax (cross-sectional curve) The maximum height is preferably 1.2 to 3.2 μm. When Rmax is 1.2 μm or more, the convex portions of the chemical conversion film are present appropriately, and uniform conductivity is obtained. On the other hand, when Rmax is 3.2 μm or less, the appearance quality of the bent part during press molding is further improved. The measurement low method of Rmax conforms to JIS B0601: '82 and JIS B0031: '82, and the measurement condition is a cut-off value of 0.8 mm.
Moreover, it is preferable that arithmetic mean roughness Ra by a roughness curve is 0.10-0.44 micrometer. The arithmetic average roughness based on the roughness curve is preferably obtained using a confocal microscope described later.

(B) Occupied area ratio of convex part The occupied area ratio of the convex part of the chemical conversion film of the lubricity aluminum coating material of this invention is the range of 1.0-3.2.
Here, the occupation area ratio of the convex part is a divided area obtained by dividing an arbitrary 0.8 mm square area (0.8 mm × 0.8 mm) on the surface of the chemical conversion film into two equal parts in the rolling vertical direction of the aluminum plate. In the divided region (sometimes referred to as the first divided region) and the other one-side divided region (also referred to as the second divided region), the occupation area ratio of the convex portions in the first divided region and the second divided region [ (Large area of convex part) / (small area of convex part)]. The large area of the convex part is the area of the convex part on the side of the convex part of the first or second divided region, and the small area of the convex part is the first or second divided part. It is the area of the convex part on the side where the area of the convex part in the region is small. The “convex portion” refers to a portion higher than the arithmetic average roughness.

If the ratio of the area occupied by the protrusions exceeds 3.2, the distribution of the protrusions on the surface of the resin film formed on the surface of the chemical film, that is, the uneven state becomes uneven, and there is no distortion remaining during molding. It becomes uniform. For this reason, the press molded product cannot obtain a sufficient flatness, and if the portion where the convex portions are densely processed is bent, the appearance quality is inferior due to the occurrence of cracks, galling scratches, and the like.
The occupied area ratio of the convex portion is preferably 1.0 to 2.3, more preferably 1.0 to 1.8, with respect to the total area 100 of 0.8 mm square, because the moldability is further improved. Is more preferable.

The measurement of the “occupied area ratio of convex portion” of the chemical conversion film is obtained as follows.
Using a “Confocal Microscope HD100” (trade name) manufactured by Lasertec Co., Ltd., an objective lens of 200 ×, an arbitrary 0.8 mm square as shown in FIG. 1 on the surface of the chemical conversion film provided on the aluminum plate This area was set, the arithmetic average roughness was determined, and the three-dimensional image was observed with the higher part as the convex part. The entire 0.8 mm square region is further divided equally into 40 × 40, and a finely divided region is divided into a total of 1600 partitions. Each of the two equally divided regions is 20 (number of partitions in the rolling direction) × 40. A total of 800 subdivision areas (number of sections in the width direction) are provided. Among these, in each of the equal divisions, the number (n) of the divisions including the convex portions was obtained from all 800 divisions of the equal division. By multiplying the obtained number of sections (n) by the area of one section, an area including a convex portion is obtained (formula (1)). This measurement is repeated for any other 20 locations in the 0.8 mm square region, and from Sa (large area of the convex portion) / Sb (small area of the convex portion) obtained at each of these locations, The arithmetic average was obtained, and this was defined as the final occupied area ratio [Sa (large area of convex part) / Sb (small area of convex part)].

S = n × (arbitrary area) / (number of subdivision areas) = n × 0.8 × 0.4 / 800 (1)

  The area obtained here was S, the larger area was Sa, and the smaller area was Sb.

  The surface shape of the chemical conversion film is the surface roughness of the rolling roll in the final pass in the cold rolling process, the rolling reduction of the final pass in the cold rolling process, the viscosity of the rolling oil, the heat treatment conditions after cold rolling, and the alkali cleaning conditions. In addition, the pickling conditions and the chemical conversion treatment conditions are controlled as described above, and the conditions are adjusted according to the conditions of storage at room temperature after the chemical conversion treatment. Specifically, the “occupied area ratio of the convex portion” is such that the surface roughness (arithmetic average roughness Ra) of the rolling roll is 0.45 μm or less, the rolling reduction of the final pass is 55% or less, and the viscosity of the rolling oil 5.8 cSt or less, the treatment time is lengthened among the heat treatment conditions, the treatment time is lengthened among the alkali cleaning conditions, and the treatment time is lengthened among the acid washing conditions after the alkali cleaning, and the chemical film formation conditions Of these, the processing time is lengthened, and among the conditions for storage at room temperature, the longer the processing time, the greater the tendency.

  In addition, after forming the chemical conversion film, the quality of the chemical conversion film may change while the coil is raised and stored at room temperature, and the surface energy of the chemical conversion film may be lowered. In this invention, it is preferable that the surface energy of a chemical conversion film is 30-70 mN / m before apply | coating the coating material which forms a resin film. In order to keep the surface energy of the chemical conversion film within the above-mentioned range after the chemical conversion film is formed and before the coating is applied, for example, the storage period at room temperature may be within 12 months. The surface energy of the chemical conversion film can be measured in the same manner as the surface energy of the resin film described later.

C. Resin film The aluminum coating material of the present invention has a resin film on the chemical conversion film. That is, a resin film is formed on the chemical conversion film. The resin film is formed by baking a paint in which a thermosetting resin and wax are dissolved or dispersed in an appropriate solvent. The surface of the resin film thus obtained comprises a polar component having a predetermined surface energy, as will be described later.

C-1. Thermosetting resin As the thermosetting resin, any thermosetting resin may be used. In the present invention, in particular, bisphenol type epoxy resin or bisphenol type modified epoxy synthesized by polycondensation of bisphenols and epihalohydrin. It is preferable to use a resin. Bisphenol-type epoxy resins and bisphenol-type modified epoxy resins have high adhesion to non-chromate films, and are excellent in corrosion resistance and solvent resistance.

  As bisphenols, 2,2-bis (4-hydroxyphenyl) propane (bisphenol A), 2,2-bis (4-hydroxyphenyl) butane (bisphenol B), 1,1-bis (4-hydroxyphenyl) Examples include ethane and bis (4-hydroxyphenyl) methane (bisphenol F), and bisphenol A is particularly preferable.

A liquid epoxy resin having an average of one bisphenol skeleton in the molecular chain is prepared from bisphenols and epihalohydrin, and then this liquid epoxy resin and bisphenols are heated in the presence of a catalyst to undergo a polyaddition reaction. . The molecular weight of the resulting epoxy resin can be adjusted by synthesis conditions. The higher the purity of the liquid epoxy resin, the higher the mixing ratio (mass ratio) of the liquid epoxy resin and bisphenol, the higher the reaction temperature, and the longer the reaction time, the higher the molecular weight epoxy resin. can get. The number average molecular weight of the bisphenol type epoxy resin used in the present invention is preferably 3000 to 30000 in terms of good moldability. The number average molecular weight is measured using gel permeation chromatography (GPC). The glass transition temperature (Tg) is preferably 80 ° C. to 110 ° C. in terms of improving the hardness of the resin layer. The glass transition temperature is measured using DSC.

  The bisphenol type epoxy resin may be appropriately synthesized, and a commercially available product can be used. Examples of commercially available products include “JER1010” (trade name, manufactured by Mitsubishi Chemical Corporation), “JER1009” (trade name, manufactured by Mitsubishi Chemical Corporation), “Epicron 850” (trade name, manufactured by DIC Corporation), and “ "Epiclon 860" (trade name, manufactured by DIC Corporation), "Epiclon 1050" (trade name, manufactured by DIC Corporation), and the like.

  As the bisphenol type modified epoxy resin, for example, the skeleton of the bisphenol type epoxy resin can be modified with styrene, phthalic acid or phthalic acid esters, or can be made into a copolymer. A bisphenol type nitrile-modified epoxy resin having a nitrile group in the molecule can also be used. As bisphenols, 2,2-bis (4-hydroxyphenyl) propane (bisphenol A), 2,2-bis (4-hydroxyphenyl) butane (bisphenol B), 1,1-bis (4-hydroxyphenyl) Examples include ethane and bis (4-hydroxyphenyl) methane (bisphenol F), and bisphenol A is particularly preferable.

  In addition, since the thermosetting resin used in the present invention has an epoxy group or a hydroxyl group in the molecule, a curing agent can be blended and heat-cured. As the curing agent, it is preferable to use urea resin, phenol resin, benzoguanamine resin, or the like. The compounding ratio of the bisphenol-type epoxy resin or the above-mentioned bisphenol-type modified epoxy resin and the curing agent depends on the number of equivalents of the sites (epoxy groups, groups such as phenolic hydroxyl groups), but the mass ratio is 97: 3. ~ 60: 40 is preferred.

  Examples of the curing agent urea resin include a compound obtained by condensing a urea compound and an aldehyde compound such as formaldehyde to form hydroxymethylol, and examples thereof include a butylated urea resin and a methylated urea resin. For example, phenol novolak resin, o-cresol novolak resin, p-cresol novolak resin, t-butylphenol novolak resin, dicyclopentadiene cresol resin, polyparavinylphenol resin, bisphenol A type novolak resin, or modified products thereof Etc. are preferably used. As the benzoguanamine resin, n-butylated benzoguanamine resin, iso-butylated benzoguanamine resin, methylated benzoguanamine resin and the like are preferably used. In particular, the benzoguanamine resin is preferable because it is excellent in flexibility and water resistance, and thus improves the workability and corrosion resistance of the cured coating film. In addition to these, methyl etherified melamine resin, butyl etherified melamine resin, and the like can also be used.

C-2. Wax Wax is used as a component for imparting lubricity to the surface of the precoated aluminum plate. In the present invention, although not particularly limited, at least one of polyethylene wax, carnauba wax, and paraffin wax is preferably used. The polyethylene wax preferably has a number average molecular weight of 600 to 12000 and a melting point of 80 to 130 ° C. As the polyethylene wax, PTFE-modified polyethylene wax, oxidized high density polyethylene wax, mixed wax of polyethylene and PTFE, PTFE / polyethylene alloy wax, or the like may be used. Carnauba wax is a plant wax mainly composed of a higher fatty acid ester and has a melting point of 80 to 86 ° C. Paraffin wax is obtained by separating and extracting hydrocarbons with good crystallinity from a crude oil distilled under reduced pressure, and is mainly composed of linear hydrocarbons and has a melting point of 40 to 70 ° C. The content of the wax is 1 to 15% by mass, preferably 2 to 12% by mass with respect to the thermosetting resin. Further, it is preferable to use a wax having an average particle diameter of 1 to 5 μm. When the average particle diameter of the wax is within the above range, when coated in a wet state, the wax is difficult to dissolve in the solvent, and thus easily protrudes from the surface of the resin film. By baking and drying this, the portion protruding on the surface is melted and the resin film surface is covered with wax, so that a suitable wax distribution can be obtained. The number average molecular weight is measured using gel permeation chromatography (GPC). The melting point is measured according to JIS K7121. The average particle diameter is measured by a laser diffraction / scattering method.

C-3. Additives Paints that form resin films include, for example, surfactants, fluidity regulators, leveling agents, anti-waxing agents, etc. used in ordinary paints to ensure coating performance and general performance as precoat materials. May be added as appropriate.

C-4. Resin film of the polar component present invention the surface energy polar component of energy of the surface is in the range of 0.1~3.6mN / m. When the polar component of the surface energy is within the above range, the slidability of the surface of the resin film is improved. That is, when the polar component exceeds 3.6 mN / m, the slidability of the surface of the resin film is inferior, and the mold and the resin film are rubbed and scratched at a part where the molding conditions are severe during press molding. The appearance quality of the molded product may be inferior. On the other hand, if the polar component is less than 0.1 mN / m, no further effect on the slidability is recognized, resulting in an increase in cost. In terms of further improving the slidability of the surface and further improving the slidability, the polar component of the surface energy is preferably 0.2 to 2.6 mN / m, and 0.3 to 1.2 mN / m. More preferably.

The polar component of the surface energy of the resin film is obtained by measuring the contact angle between pure water and the resin film of diiodomethane (CH ₂ I ₂ ) by the θ / 2 method using a contact angle meter, and measuring 10 times. The arithmetic average value is obtained, and the polar component of the surface energy of the resin film surface is calculated by the following formula.

γ _s = γ ^d _s + γ ^h _s
1 + cos θ = 2 × (γ ^d _s ) ^1/2 × ((γ ^d _l ) ^1/2 / γ _lv )
+ 2 × (γ ^h _s ) ^1/2 × ((γ ^h _l ) ^1/2 / γ _lv )
θ: Contact angle (droplet method )
γ _s : surface energy of resin film surface γ ^d _s : dispersion component of surface energy of resin film surface γ ^d _l : dispersion component of surface tension of liquid γ ^h _s : polar component of surface energy of resin film surface γ ^h _l : Polar component of surface tension of liquid γ _lv : Surface tension of liquid

Specifically, the surface tension γ _lv of the water, the polar component γ ^h _{l of} the surface tension, and the dispersion component γ ^d _{l of the} tension are determined by two relational expressions of the contact angle θ ^{H of} pure water and the contact angle θ ^{I of} diiodomethane. Are respectively 72.8 mN / m, 51.0 mN / m, and 21.8 mN / m, and the surface tension γ _{lv of} diiodomethane, the polar component γ ^h _{l of} the surface tension, and the dispersion component γ ^d _l of the surface tension are , 50.8 mN / m, 1.3 mN / m, and 49.5 mN / m, respectively.
For this reason, the polar component of the surface energy of the resin film can be obtained by solving the following three simultaneous equations.

γ _s = γ ^d _s + γ ^h _s
1 + cos θ ^H = 2 × (γ ^d _s ) ^1/2 × ((21.8) ^1/2 /72.8)
+ 2 × (γ ^h _s ) ^1/2 × ((51.0) ^1/2 /72.8)
1 + cos θ ^I = 2 × (γ ^d _s ) ^1/2 × ((49.5) ^{1/2 /} 50.8)
+ 2 × (γ ^h _s ) ^1/2 × ((1.3) ^{1/2 /} 50.8)
θ ^H : contact angle of pure water θ ^I : contact angle of diiodomethane γ _s : surface energy of resin film surface γ ^d _s : dispersion component of surface energy of resin film surface γ ^h _s : polar component of surface energy of resin film surface

The polar component γ ^h _s of the surface energy of the resin film is adjusted by adjusting the surface energy of the chemical conversion film surface, the surface tension of the paint forming the resin film, and the baking condition of the paint. The surface energy of the chemical conversion film surface is as described above, and the surface tension of the paint is preferably 10 to 32 mN / m.
Specifically, if the surface energy of the chemical film is reduced, the surface tension of the paint is reduced, or the baking temperature of the paint is shortened, the surface energy of the resin film surface tends to increase. is there. The surface tension of the paint can be measured with an automatic surface tension meter.

C-5. Average film thickness of resin film The average film thickness of the resin film is preferably in the range of 0.3 to 8.0 μm. When the average film thickness is in the range of 1.7 to 8.0 μm, the abrasion resistance increases as the amount of wax contained in the coating film increases, so even if the optical disk and the traverse base in the optical drive come into contact with each other, The durability can be improved because the performance of the above can be maintained. On the other hand, when the average film thickness is in the range of 0.3 to 1.7 μm , the lubricity is excellent at low cost. The average film thickness of the resin film is more preferably in the range of 0.3 to 0.8 μm. When the average film thickness is in the range of 0.3 to 0.8 μm, the lubricity is excellent at low cost, and the conductivity is also excellent. Thus, by setting the film thickness of the resin film in the range of 0.3 to 0.8 μm, the resin film having a predetermined coating film hardness is not easily deformed when a steel ball is pressed, and excellent conductivity is obtained. It is done. Therefore, this invention can provide the aluminum coating material which can ensure uniform electroconductivity even under a light load. The average film thickness is calculated by dividing the value measured by the mass method by the specific gravity of the dry coating film, or the cross section is observed with a transmission electron microscope, the film thickness is measured at 20 locations, and the average value is calculated. You can do it.

C-6. Hardness of Resin Film The hardness of the resin film in the present invention is preferably in the range of 0.5 to 5 MPa as measured by the nanoindentation method. By setting it as this range, even if the film thickness of the resin film is in the range of 0.3 to 0.8 μm, the coating film is hardly deformed, excellent in conductivity, and can be suppressed at low cost.

C-7. Formation of a resin film A thermosetting resin and wax, and additives are added as appropriate, and a paint in which these are dissolved or dispersed in an appropriate solvent is applied onto the chemical conversion film formed on the aluminum plate, and the oven is heated at a predetermined temperature. It is baked and dried after being treated for a predetermined time. Although there is no limitation regarding a solvent, Water, ester, glycol ether, glycol, ketone, aromatic or aliphatic hydrocarbon, alcohol, etc. are mentioned. Among these, xylene, propylene glycol monomethyl acetate, and dibasic acid esters (such as dimethyl ester of adipic acid, glutaric acid, or succinic acid) are particularly suitable. Usually, a coating material is prepared so that it may become 1-50 mass% solid content.

In order to form a resin film on a chemical conversion film formed on an aluminum plate at a low cost, a method of continuously applying a resin film-forming paint using a roll coater using a coil is most suitable. When the paint is applied by this method, the paint is baked in a baking furnace divided into 3 to 7 zones. Further, the total baking time is preferably 10 to 60 seconds, and more preferably 20 to 45 seconds. In addition, it may replace with a roll coater and may apply | coat a coating material with an air spray, a bar coater, etc.
The baking temperature is preferably 200 to 290 ° C. at the highest reached plate temperature.

  EXAMPLES The present invention will be described in detail below with reference to examples, but the present invention is not limited to these examples.

(Examples 1-4)
Both surfaces of a 5000 series aluminum alloy plate (thickness 0.2 mm) having the Vickers hardness shown in Table 1 are degreased with an alkaline degreasing solution, washed with water, acid washed with 2% by mass sulfuric acid, washed with water, phosphorus Chemical conversion treatment was performed with an acid chromate treatment solution. Next, 90 parts by mass of a bisphenol A type epoxy resin (trade name “JER1010”, manufactured by Mitsubishi Chemical Corporation) and a urea resin (trade name “Nicalac MX-280”, Inc.) are formed on one side of the formed phosphate chromate conversion coating. A coating containing 10 parts by mass of Sanwa Chemical Co., Ltd. and 1 part by mass of polyethylene wax (trade name “High Wax 400P”, manufactured by Mitsui Chemicals, Inc.) is supplied to the roll by a top feed method, and a roll coater (2 rolls, (Natural rotation), the temperature was raised in an oven consisting of 4 zones, and the maximum reached plate temperature was baked and dried at 250 ° C. to produce an aluminum coating material.
The conditions of the final pass of the aluminum plate (the surface roughness of the rolling roll, the compression ratio, and the viscosity of the rolling oil), the surface energy of the formed phosphate chromate conversion coating, and the surface tension of the paint are shown in Table 1 below.

(Examples 5 to 8)
Both surfaces of a 5000 series aluminum alloy plate (thickness 0.2 mm) having Vickers hardness shown in Table 1 were degreased with an alkaline degreasing solution, washed with water, acid washed with 2% by mass sulfuric acid, washed with water, and zirconium- Zirconium-molybdenum chemical conversion treatment was performed with a molybdenum-based treatment liquid. Next, 85 parts by mass of bisphenol A type epoxy resin (trade name “JER1010”, manufactured by Mitsubishi Chemical Corporation), urea resin (trade name “Uban 10S60”, Mitsui Chemicals) on one side of the formed zirconium-molybdenum conversion coating The paint containing 15 parts by mass of the company) and 2 parts by mass of polyethylene wax (trade name “CERAFLOUR950”, manufactured by Big Chemie Co., Ltd.) is supplied to the roll by the top feed method, and is coated with a roll coater (2 rolls, natural rotation). Then, the temperature was raised in an oven consisting of 4 zones, and the highest reached plate temperature was baked and dried at 250 ° C. to produce an aluminum coating material.
The conditions of the final pass of the aluminum plate (the surface roughness of the rolling roll, the compression ratio, and the viscosity of the rolling oil), the surface energy of the formed zirconium-molybdenum-based chemical conversion film, and the surface tension of the paint are shown in Table 1 below. .

(Examples 9 and 10)
Both surfaces of a 5000 series aluminum alloy plate (thickness 0.2 mm) having the Vickers hardness shown in Table 1 are degreased with an alkaline degreasing solution, washed with water, acid washed with 2% by mass sulfuric acid, washed with water, phosphorus Chemical conversion treatment was performed with an acid chromate treatment solution. Next, 85 parts by mass of a bisphenol A-type modified epoxy resin, 15 parts by mass of a urea resin (trade name “Beckamine P-196-M”, manufactured by DIC Corporation) and polyethylene wax are formed on one side of the formed phosphate chromate conversion coating. Supply paints each containing 5 parts by mass (trade name “High Wax 200P”, manufactured by Mitsui Chemicals Co., Ltd.) and 2 parts by mass Carnauba wax (trade name “CERACOL601”, manufactured by Big Chemie Co., Ltd.) to the roll in a bottom-up manner. Then, it was coated with a roll coater (3 rolls, natural rotation), heated in an oven consisting of 3 zones, and baked and dried at a maximum reached plate temperature of 230 ° C. to produce an aluminum coating material.
The conditions of the final pass of the aluminum plate (the surface roughness of the rolling roll, the compression ratio, and the viscosity of the rolling oil), the surface energy of the formed phosphate chromate conversion coating, and the surface tension of the paint are shown in Table 1 below.

(Examples 11 and 12)
Both surfaces of a 5000 series aluminum alloy plate (thickness 0.4 mm) having Vickers hardness shown in Table 1 are degreased with an alkaline degreasing solution, washed with water, acid washed with 2% by mass sulfuric acid, washed with water, phosphorus Chemical conversion treatment was performed with an acid chromate treatment solution. Next, 85 parts by mass of a bisphenol A type nitrile-modified epoxy resin (number average molecular weight 9000) and a benzoguanamine resin (trade name “Super Becamine TD-126” manufactured by DIC Corporation) 15 are formed on one surface of the formed phosphate chromate conversion coating. A paint containing 5 parts by mass and 5 parts by mass of paraffin wax (trade name “155” manufactured by Nippon Seiwa Co., Ltd.) is supplied to the roll in a bottom-up manner, and is applied with a roll coater (2 rolls, reverse rotation). The temperature was raised in an oven consisting of a zone, and baked and dried at a maximum temperature of 250 ° C. to produce an aluminum coating material.
The conditions of the final pass of the aluminum plate (the surface roughness of the rolling roll, the compression ratio, and the viscosity of the rolling oil), the surface energy of the formed phosphate chromate conversion coating, and the surface tension of the paint are shown in Table 1 below.

(Example 13)
Both surfaces of a 5000 series aluminum alloy plate (thickness 0.4 mm) having Vickers hardness shown in Table 1 are degreased with an alkaline degreasing solution, washed with water, acid washed with 2% by mass sulfuric acid, washed with water, phosphorus Chemical conversion treatment was performed with an acid chromate treatment solution. Next, 90 parts by mass of a bisphenol A-type nitrile-modified epoxy resin (number average molecular weight 8000) and a benzoguanamine resin (trade name “Nicarak BL-60” manufactured by Sanwa Chemical Co., Ltd.) 10 are formed on one side of the formed phosphate chromate conversion coating. Supply the paint containing 3 parts by mass and 3 parts by mass of a mixture of polyethylene and PTFE (trade name “CERAFLOUR 996” manufactured by Big Chemie Japan Co., Ltd.) to the roll in a bottom-up manner, and roll coater (2 rolls, reverse rotation) It was painted and heated in an oven consisting of three zones, and baked and dried at a maximum temperature of 250 ° C. to produce an aluminum coating material.
The conditions of the final pass of the aluminum plate (the surface roughness of the rolling roll, the compression ratio, and the viscosity of the rolling oil), the surface energy of the formed phosphate chromate conversion coating, and the surface tension of the paint are shown in Table 1 below.

(Examples 14 to 16)
Both surfaces of a 5000 series aluminum alloy plate (thickness 0.4 mm) having the Vickers hardness shown in Table 2 are degreased with an alkaline degreasing solution, washed with water, acid washed with 2% by mass sulfuric acid, washed with water, phosphorus Chemical conversion treatment was performed with an acid chromate treatment solution. Next, 90 parts by mass of a bisphenol A-type nitrile-modified epoxy resin (number average molecular weight 8000) and a benzoguanamine resin (trade name “Nicarak BL-60” manufactured by Sanwa Chemical Co., Ltd.) 10 are formed on one side of the formed phosphate chromate conversion coating. Supply the paint containing 3 parts by mass and 3 parts by mass of a mixture of polyethylene and PTFE (trade name “CERAFLOUR 996” manufactured by Big Chemie Japan Co., Ltd.) to the roll in a bottom-up manner, and roll coater (2 rolls, reverse rotation) It was painted and heated in an oven consisting of three zones, and baked and dried at a maximum temperature of 250 ° C. to produce an aluminum coating material.
The conditions of the final pass of the aluminum plate (the surface roughness of the rolling roll, the compression ratio, and the viscosity of the rolling oil), the surface energy of the formed phosphate chromate conversion coating, and the surface tension of the paint are shown in Table 2 below.

(Comparative Examples 1-4)
Both surfaces of a 5000 series aluminum alloy plate (thickness 0.2 mm) having the Vickers hardness shown in Table 1 are degreased with an alkaline degreasing solution, washed with water, washed without acid and washed with 2% by mass sulfuric acid. Chemical conversion treatment was performed with an acid chromate treatment solution. Next, 88 parts by mass of bisphenol A type epoxy resin (trade name “JER1010”, manufactured by Mitsubishi Chemical Corporation) and urea resin (trade name “Uban 10R”, Mitsui Chemicals, Inc.) are formed on one side of the formed phosphate chromate conversion coating. A coating material containing 12 parts by mass and 0.5 parts by mass of polyethylene wax (trade name “High Wax 405MP”, manufactured by Mitsui Chemicals, Inc.) is supplied to the roll by a top feed method, and a roll coater (2 rolls, natural Rotation), the temperature was raised in an oven consisting of two zones, and the highest reached plate temperature was baked and dried at 250 ° C. to produce an aluminum coating material.
The conditions of the final pass of the aluminum plate (the surface roughness of the rolling roll, the compression ratio, and the viscosity of the rolling oil), the surface energy of the formed phosphate chromate conversion coating, and the surface tension of the paint are shown in Table 1 below.

<Measurement of amount of chemical conversion film>
The coating amount (Cr conversion amount) of the phosphate chromate conversion coating of the aluminum coating material thus prepared or the coating amount (Zr conversion amount) of the zirconium-molybdenum-based conversion coating was measured with a fluorescent X-ray analyzer. As a result, each of Examples 1 to 4 and Comparative Examples 1 to 4 has a Cr equivalent of 20 mg / m ² , and Examples 5 to 8 have a Zr equivalent of 2 mg / m ^2. And 10 both had a Cr equivalent of 10 mg / m ² .
In all of Examples 11 to 16, the Cr conversion amount was 30 mg / m ² .

<Surface shape of chemical conversion film surface and occupied area ratio of convex part>
The “occupied area ratio of projections” on the surface of the phosphate chromate conversion coating or the zirconium-molybdenum conversion coating exposed by peeling off the resin coating of the prepared aluminum coating material was measured.
That is, by using “Confocal Microscope HD100” (trade name) manufactured by Lasertec Co., Ltd., an objective lens of 200 times, an arbitrary 0.8 mm square area as shown in FIG. Arithmetic mean roughness was obtained, and a three-dimensional image was observed with the higher portion as a convex portion. The entire 0.8 mm square area is further divided equally into 40 × 40, and a subdivided area divided into a total of 1600 sections is set, and this area is divided into two equal parts perpendicular to the rolling direction. In addition, two divided areas of 800 sections of 20 (number of sections in the rolling direction) × 40 (number of sections in the width direction) were set. As shown in the formula (1), the area of the convex portion was obtained by multiplying the number of divisions (n) including the convex portion by the area of one compartment. The area obtained here was S, the larger area was Sa, and the smaller area was Sb.

S = n × (arbitrary area) / (number of subdivision areas) = n × 0.8 × 0.4 / 800 (1)

This measurement was repeated for any 20 locations to determine Sa / Sb. Thus, the arithmetic average of Sa / Sb obtained in each place was calculated | required, and this was made into the final occupation area ratio of a convex part.
The obtained results are shown in Tables 1 and 2.

<Polar component of surface energy on resin film surface>
The polar component of the surface energy of the resin film of the aluminum coating material was measured as described above. The obtained results are shown in Tables 1 and 2.

<Thickness of resin film surface>
Tables 1 and 2 show the results of measuring the film thickness of the resin film of the produced aluminum coating material by the above-described measuring method.

About the aluminum coating material produced in Examples 1-13 and Comparative Examples 1-4, slidability, a moldability, and electroconductivity were evaluated by the following method. About the aluminum coating material produced in Examples 14-16, the moldability and abrasion resistance were evaluated by the following method.
In any evaluation item, A and B are acceptable levels, and C is unacceptable.

<Slidability>
Using a 3/16 inch steel ball, the coefficient of dynamic friction after sliding the surface of the aluminum coating material 5 times with 5N was measured by a Bowden friction test.
A: Dynamic friction coefficient is less than 0.10 B: Dynamic friction coefficient is 0.10 or more and less than 0.20 C: Dynamic friction coefficient is 0.20 or more

<Moldability>
The aluminum coating material was press-molded, and the appearance and flatness of the press-molded product were visually evaluated. In any case, A and B are acceptable levels, and C is unacceptable.

(appearance)
A: A galling wound is not recognized in the vicinity of a bending part, and a coating-film crack is not recognized in a bending part.
B: Although no galling is observed in the part not subjected to the processing in the vicinity of the bent part, a crack in the coating film is slightly observed in the bent part.
C: A galling wound and a remarkable crack are recognized in the bending part in the part which has not received the process of the bending part vicinity.

(Flatness)
A: A local distortion is not recognized and the surface is smooth.
B: Slight local distortion is recognized.
C: Local distortion is remarkably recognized.

<Conductivity>
The electrical resistance value when a steel probe having a tip radius of 5 mm was brought into contact with the resin coating surface of the aluminum coating material with a load of 50 gf was measured at 50 locations. The number of energizations in 50 measurements was counted. A and B are acceptable levels, and C is unacceptable.
A: 50 times B: 40 times or more and 49 times or less C: 39 times or less

<Abrasion resistance>
Using an aluminum coating material, a Taber abrasion test was conducted, and the amount of abrasion after 500 tests was measured. A and B are acceptable levels, and C is unacceptable.
A: Less than 10 mg B: 10 mg or more and less than 20 mg C: 20 mg or more

As shown in Table 1, each of the aluminum coating materials of Examples 1 to 13 has a chemical film on the surface of the aluminum material and a resin film on the chemical film, and the area occupied by the convex portions on the surface of the chemical film. The ratio is in the range of 1.0 to 3.2, the polar component of the surface energy of the resin film surface is 1.0 to 3.6 mN / m, and it has excellent slidability and good press moldability. there were.
In particular, among Examples 1 to 13, Examples 7 to 8, 11 and 13 in which the average film thickness of the resin film is in the range of 0.3 to 0.8 μm are all excellent in slidability and moldability. In addition, it was excellent in conductivity.
On the other hand, as shown in Table 2, Examples 14 to 16 all had excellent wear resistance and good press moldability.

  On the other hand, the aluminum coating materials of Comparative Examples 1, 2, and 4 have poor convexity because the ratio of the convex area occupied on the surface of the chemical conversion film exceeds 3.2, and in particular, the appearance quality is particularly poor. there were. In the aluminum coating material of Comparative Example 3, the ratio of the projected area occupied by the surface of the chemical film is in the range of 1.0 to 3.2, but the polar component of the surface energy of the resin film surface exceeds 3.6 mN / m. Therefore, slidability and moldability (appearance and flatness) were inferior.

  While this invention has been described in conjunction with its embodiments, we do not intend to limit our invention in any detail of the description unless otherwise specified and are contrary to the spirit and scope of the invention as set forth in the appended claims. I think it should be interpreted widely.

  This application claims priority based on Japanese Patent Application No. 2013-012701 filed in Japan on January 25, 2013, which is incorporated herein by reference. Capture as part.

DESCRIPTION OF SYMBOLS 1 Chemical conversion film surface 2 1st division area 3 2nd division area 4 Subdivision area

Claims (8)

An aluminum coating material having a chemical film on at least one surface of the aluminum material and a resin film on the chemical film, wherein an arbitrary 0.8 mm square region on the surface of the chemical film is formed by rolling the aluminum material vertically In the divided region divided into two equal parts , the projected area occupied area ratio, which is (large area of projected area) / (small area of projected area) obtained by the following calculation method of projected area occupied area ratio is 1.0 to 3 The surface energy polar component (γ ^h _s ) obtained by solving the following three simultaneous equations in the evaluation of the surface free energy by the following Owens-Wendt method of the resin film. Is a lubricating aluminum coating material, characterized in that it is 0.1 to 3.6 mN / m.
[Calculation method of projected area ratio]
An arbitrary 0.8 mm square region is set on the surface of the chemical conversion film, and a two equally divided region is formed by dividing the aluminum material into two equal parts in the rolling vertical direction. The ratio of the projected area occupied by Sa / Sb, which is the ratio of the relatively small area Sb of the projected area to the relatively large area Sa, is calculated. At this time, as a method for calculating the projected area occupied area ratio, Lasertec Co., Ltd. Using the “Confocal Microscope HD100 (trade name)”, an arbitrary 0.8 mm square area is set on the surface of the chemical conversion film provided on the aluminum plate with an objective lens of 200 ×, and these arithmetic average roughnesses are set. The three-dimensional image is observed with the portion higher than the arithmetic average roughness as the convex portion, and the entire 0.8 mm square region is further divided equally into 40 × 40 to be divided into a total of 1600 sections. A divided area is set, and in each of the two equal divided areas, a total of 800 subdivided areas of 20 (number of sections in the rolling direction) × 40 (number of sections in the width direction) are set. In each of the two equally divided areas among the subdivided areas, the number of sections (n) including the convex portions in each of the total 800 subdivided areas is calculated, and the number of sections (n ) Is multiplied by the area per section to calculate the area including the convex portion (S = n × (arbitrary area) / (number of subdivision areas) = n × 0.8 × 0.4 / 800 · (1)), the area including the convex portion thus obtained was calculated for any 20 other regions of the 0.8 mm square region, and thus obtained. The arithmetic average of Sa / Sb is the final convex area occupied area ratio Sa (large area of convex parts) / Sb (convex And small area) of the calculation method of protrusions filling ratio.

  The lubricating aluminum coating material according to claim 1, wherein the resin film is a cured film made of a bisphenol type epoxy resin or a bisphenol type modified epoxy resin and a urea resin or a phenol resin.   The lubricating aluminum coating material according to claim 1, wherein the resin film is a cured film of a bisphenol-type nitrile-modified epoxy resin.   The lubricating aluminum coating material according to claim 1 or 3, wherein the resin film is a cured film made of a bisphenol-type epoxy resin or a bisphenol-type nitrile-modified epoxy resin and a benzoguanamine resin.   The lubricating aluminum coating material according to any one of claims 1 to 4, wherein an average film thickness of the resin film is 0.3 to 8.0 µm.   The lubricating aluminum coating material according to claim 1, wherein an average film thickness of the resin film is 0.3 to 1.7 μm.   The lubricating aluminum coating material according to claim 1, wherein an average film thickness of the resin film is 0.3 to 0.8 μm. The lubricating aluminum coating material according to claim 1, wherein an average film thickness of the resin film is 1.7 to 8.0 μm.

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