MXPA02007395A

MXPA02007395A - Metal surface treatment agent.

Info

Publication number: MXPA02007395A
Application number: MXPA02007395A
Authority: MX
Inventors: Yasuhiro Kinoshita
Original assignee: Henkel Kgaa
Priority date: 2000-02-18
Filing date: 2001-02-20
Publication date: 2002-12-09
Also published as: WO2001060603A1; JP3803819B2; EP1268193A4; CA2400364A1; JP2001234349A; EP1268193A1

Abstract

The object of the present invention is to provide a metal surface treatment agent which improves the press molding workability of metal materials, and which can form a coating film that is superior in terms of at least one of moisture resistance and coating film stripping characteristics. The metal surface treatment agent of the present invention comprises (A) a copolymer which comprises (a) styrene and (b) a vinyl compound with carboxyl groups that is copolymerizable with styrene, and (B) a lubricating agent. The metal surface treatment agent is characterized by the fact that the weight ratio of component (a) to component (b) in the aforementioned polymer (A), i.e., (a) (b) (weight ratio), is in the range of 1 9 to 9 1, the proportion of (a) plus; (b) in the aforementioned polymer (A) is 30 to 100 weight %, and the weight ratio of (B) to (A) plus; (B) is 2 to 30 weight %.

Description

METAL SURFACE TREATMENT AGENT BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal surface treatment agent, which improves the working capacity of the press molding of metal materials, and can form a coating film that is superior in terms of at least one of the characteristics of moisture resistance and separation of the coating film, it also relates to a metal material treated on the surface and to a method for surface treating metal materials. 2. Prior Art In most cases, metal plates, used in domestic electrical appliances, building materials and other parts, are manufactured by molding, such as press molding, etc. Conventionally, in the case of such press molding, a method in which the metal plates are coated with a lubricating press molding oil (press oil) and then molded, after which the press oil is removed by a process of grease removal and cleaning, using a solvent, such as a chlorine type solvent, etc., has been widely used.

However, recently, the deterioration of the working environment during the coating process of the press oil, and a response to the regulation of the use of chlorine-type solvents, etc., used in degreasing, has begun to be seen as important. Therefore, in order to eliminate the aforementioned press oil coating process, so-called lubricant treatment processes of the coating film, of the film removal type, in which an organic coating film has been developed, has been developed. , which provides a function of molding lubrication, is formed on the surfaces of the metal plates, molding such as press molding, etc., is performed and the organic coating film is then removed by a method, such as degreasing of alkali, etc. In connection with said processes, various types of surface treatment agents for metal and metal plates treated on the surface have been proposed. For example, a metal surface treatment agent, in which a base resin, containing a water-soluble resin, with a glass transition temperature of 15 to 36 ° C and a water-soluble resin, with a temperature of glass transition from 60 to 90 ° C, at a ratio of 4: 6 ~ 6: 4, is mixed with a lubricating agent, which has a melting point of 100 ° C or more, at a rate of 2 to 10 parts by weight of the agent lubricant at 90 to 98 parts by weight of the base resin (Japanese Patent Application Kokai No. 54-18462), metal surface treatment agents, which consist of a flexible resin, water dispersible, soluble in water and soluble in an aqueous solution of alkali, a solid lubricating agent and a body pigment or fluorine resin powder (Japanese Patent Application Kokai No. 8-291294, Japanese Patent Application Kokai No. 10152691), a surface treatment agent, consisting of 20 to 50% of the water-soluble acrylic resin, 20 to 50% wax emulsion, with a melting point of 50 to 130 ° C and 10 to 40% of alkali soluble colloidal silica (Application of Japanese Patent Kokai No. 10-88364) and a method in which a coating of the lower layer, with a thickness of 1 to 50 μm, consisting of an acrylic resin, with an acid value of 40 to 400, and a glass transition temperature of -10 to 30 ° C, and a reverse film The top layer with a thickness of 3 to 60 μm, consisting of an acrylic resin with an acid value of 40 to 400, and a glass transition temperature of 40 to 80 ° C, are formed successively on the surfaces of stainless steel plates (Japanese Patent Application Kokai No. 8-156177), etc., have been proposed.

However, in the case of these metal surface treatment agents and other surface treated metal materials proposed in the past, although the working capacity of the press molding of the metal materials is improved, they have problems in terms of construction, which result from depositing a resin that forms the coating film in the press molding tools and rollers, installed downstream from the oven outlet in the 10 line of paint, the glued to the mold of the surfaces of the metal plates, caused by substances in mixture in the coating film and blocking of the metal plates with each other, caused by the sticky adhesion of the surfaces of the film of coating during the Storage, as well as problems arising from the physical properties of the coating films, such as the need for a considerable amount of time for the degreasing treatment, and the fact that the separation characteristics of the film are inferior. 20 coating, etc. Thus, the aforementioned metal surface treatment agents, and metal materials treated on the surface, can not yet be said to be suitable. 25 * s ** ^ ***? m * t ....... ^ *** *,. w- .. -. * * *** SUMMARY OF THE INVENTION The object of the present invention is to solve the aforementioned problems encountered in the prior art, and to provide a metal surface treatment agent that improves the working capacity of the press molding of metal materials, and that it can form a coating film which is superior in terms of at least one of the characteristics of moisture resistance and separation of the coating film, and a 10 metal material treated on the surface, which is surface treated with this metal surface treatment agent, and a method for surface treatment of metal materials. The inventors of the present invention have It has been discovered that the aforementioned problems can be solved by using a metal surface treatment agent containing a lubricating agent and a copolymer having a specified chemical structure. The present invention provides an agent of 20 metal surface treatment, which comprises (A) a copolymer, which includes (a) styrene and (b) a vinyl compound with carboxyl groups, which are copolymerizable with styrene, and (B) a lubricating agent. The copolymer (A) has a weight ratio of 25 component (a) to component (b), ie (a) / (b) (relationship by weight) in the range of 1/9 to 9/1, a ratio of (a) + (b) in the polymer (A) from 30 to 100% by weight and a ratio of (B) to (A) + (B) from 2 to 30% by weight. It is convenient that the lubricating agent (B), mentioned above, comprises at least one substance selected from the group consisting of paraffin wax, microcrystalline wax, polyethylene wax and polypropylene wax. It is also convenient that the polymer (A), mentioned above, is a polymer with a glass transition temperature of 75 ° C or higher. Likewise, the present invention also provides a surface treated metal material with a superior working capacity of press molding and / or separation characteristics of the coating film, and a method for obtaining the same, by coating the surface of the film. a metal material with the aforementioned metal surface treatment agent, so that the adhesion amount of the coating film, after drying, is 0.1 to 5 g / m 2 and then drying the surface treatment agent of metal, mentioned above.

DETAILED DESCRIPTION OF THE PREFERRED MODALITIES First, the polymer (A) used in the present invention will be described. This polymer (A) is a copolymer containing (a) styrene and (b) a vinyl compound, with carboxyl groups, which are copolymerizable with styrene, as essential monomers. Component (b), mentioned above, is a vinyl compound with carboxyl groups, which can be copolymerized with styrene; Suitable examples of such compounds include, but are not necessarily limited to, acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, crotonic acid, itaconic acid, citraconic acid and cinnamic acid, and the like. The weight ratio of styrene (a), mentioned above, to the vinyl compound (b), which contains carboxyl groups, which can be copolymerized with styrene, ie (a) / (b) (weight ratio), is in the range of 1/9 to 9/1, preferably in the range of 2/8 to 8/2, and even more preferably in the range of 5/5 to 8/2.

In cases where (a) / (b) (weight ratio) is less than 1/9 (ie, in cases where the amount of styrene is small), the working capacity of the coating film deteriorates; specifically, the hardness of the coating film is insufficient so that this coating film is susceptible to damage during press molding. Therefore, such a small relation is inconvenient. On the other hand, in cases where (a) / (b) (ratio by weight) exceeds 9/1 (that is, in cases where the amount of styrene is large), the separation characteristics of the coating film. Therefore, such a large relationship is inconvenient. Also, the ratio of (a) + (b) in the polymer (A), that is, the proportion of the total amount of the component (a) plus the component (b) in the polymer (A), is 30 to 100% by weight, preferably 40 to 100% by weight, and even more preferably 50 to 100% by weight. In cases where the ratio of (a) + (b) in the polymer (A) is less than 30% by weight, the amount of styrene in the polymer is too small; as a result, the working capacity of the coating film deteriorates. Therefore, such a small proportion is inconvenient. There are no particular restrictions on the copolymerizable compounds, in addition to the components (a) and (b) contained in the polymer (A) used in the present invention; examples of suitable compounds include, but are not necessarily limited to, esters of aliphatic alcohols of acrylic acid, methacrylic acid, maleic acid, fumaric acid, crotonic acid and itaconic acid, etc., for example methyl (meth) acrylate, ( met) ethyl acrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, mono- or dimethyl-maleate, mono- or diethyl-maleate, mono- or dibutyl-maleate, mono- or dimethyl fumarate, mono- - or diethyl fumarate, mono- or dibutyl fumarate, crotonate methyl, ethyl crotonate, butyl crotonate, mono- or dimethyl-itaconate, mono- or diethyl-itaconate and mono- or dibutyl-itaconate, etc. In addition, acrylonitrile, methacrylonitrile, vinyl acetate, acrylamide and diacetone-5-acrylamide, etc., can also be used. Also, there are no particular restrictions on the method used to polymerize the polymer of the present invention; Ordinary methods used to polymerize the vinyl compounds, for example emulsion polymerization, suspension polymerization or solution polymerization, are convenient. With respect to the polymer (A) used in the present invention a polymer, with a glass transition temperature of 75 ° C or higher, preferably 80 ° C or higher, is suitable for use. Typically, the temperature of the material surface during press molding is ordinarily around 80 ° C. Consequently, if the glass transition temperature of the resin in the coating film is too low, the coating film may be damaged during press molding. Therefore, it is desirable that the glass transition temperature of the resin in the coating film be 75 ° C or higher. Examples of substances that can be used as the lubricating agent (B), used in the present invention, include, but are not necessarily limited to, wax of * ~ * £ ** í * * J¡k * Má. *. *, *. *** -. *** *** * - - n rm "- < , * * ... .. ,. ,. . ..-,. . ***? ** **. paraffin wax, paraffin wax derivatives, microcrystalline wax, microcrystalline wax derivatives, polyethylene wax, polypropylene wax, candelilla wax, carnauba wax, rice wax, Japan wax, jojoba wax, 5 beeswax, lanolin , spermaceti, Montana wax, Montana wax derivatives, ozocerite, ceresin, petrolatum, hardened castor oil, hardened castor oil derivatives, stearic acid amide and anhydrous phthalic acid amide, etc. Among these substances, wax Paraffin wax, microcrystalline wax, polyethylene wax and polypropylene wax are especially preferred. The metal surface treatment agent of the present invention is made by adding the polymer (A), mentioned above, and the lubricating agent (B) to the water, and 15 these ingredients are mixed, so that the ingredients are dissolved or dispersed. There are no particular restrictions in the order in which the respective components are added; however, if it is appropriate to mix the ingredients by stirring, using (for example) a stirrer 20 propeller, etc. With respect to the proportions of the polymer (A) and the lubricating agent (B), the ratio of (B) to (A) + (B) (in terms of the solids content) is from 2 to 30% by weight, preferably from 3 to 25% by weight, and even more preferably from 5 to 20% by weight. In cases where the 25 ratio of the solids content of (B) to the content of 'TTfi "-tll-fl? HUÉÉ ¡- i fí¡ ífM i, í ^ * í. * ^ solids of (A) + (B) is less than 2% by weight, the effect of the lubricating agent during press molding is insufficient. On the other hand, in cases where this ratio exceeds 30% by weight, the separation characteristic of the coating film deteriorates, since the lubricating agent is insoluble in water. Therefore, such a high ratio is inconvenient. Also, in the metal surface treatment agent of the present invention, it is desirable that the concentration of the solids content be in the range of 5 to 50% by weight, and a concentration in the range of 5 to 40% by weight. Weight is even more convenient. In cases where the concentration of the solids content is less than 5% by weight, the drying time is prolonged when a coating film is formed by applying the agent to the surface of the metal material. Therefore, such a small concentration is undesirable. On the other hand, if the concentration of the solids content exceeds 50% by weight, the viscosity of the metal surface treatment agent is increased, so that there is a danger that the handling of the agent will be adversely affected. Surfactants known as agents that improve wettability, which are used to form a uniform coating film on the coated surface, substance that are used to improve the welding capacity, and ??**** TO-- . $ »L * 3M," Color pigments used to improve the properties of the design, etc., may also be contained in the metal surface treatment agent of the present invention, as optional components. The separation characteristics of the coating film, mentioned above, are a performance value that is necessary in cases where the metal material is used in applications that require special characteristics of the material (for example, external appearance, intensity) or capacity. of treatment in subsequent processes (for example, phosphate formation treatments, alumite treatments) etc. In such cases, it is necessary that it is possible to separate the coating film by means of a treatment, such as alkaline degreasing, etc. In the case of conventional coating films of this type, the coating film can be separated by means of the alkali defatting and the like; however, the moisture resistance is insufficient, and the coating film becomes sticky as a result of being exposed to moisture in the air, during the period between the application of the coating to the metal material and the molding process, so there is a danger in blocking the metal plates. As a result, metal plates must be stored under strict humidity control. In the case of the coating film of the present invention, on the other hand, as a result of the components in the specified polymer (A), the separation of the coating film can be achieved by the degreasing of alkali, and the resistance to moisture is improved. Consequently, there is no need for strict moisture control during the storage period between the application of the coating to the metal material and the molding process. Therefore, the metal materials in which a coating film is formed, which uses the surface treatment agent of the present invention, are superior in terms of working capacity to the metal materials in which a coating is formed. coating film using a conventional surface treatment agent. There are no particular restrictions on the metal materials treated with the metal surface treatment agent of the present invention; Examples of suitable metal materials include, but are not necessarily limited to, galvanized steel plates (electro-galvanized steel plates, fused-galvanized steel plates, alloy-fused steel plates, galvanized steel plates containing 5% aluminum, galvanized steel plates containing 55% aluminum, galvanized steel plates of vacuum deposit type), aluminum plates, plates aluminum alloy, cold rolled steel plates and stainless steel plates, and the like. The surface treatment agent of the present invention is applied to the aforementioned metal material at temperatures of 10 to 40 ° C. The coating method used can be a roller coating method, immersion method or electrostatic coating method, and the like. Following the coating, the drying is carried out with the temperature reached by the 10 plates set at 50 to 180 ° C, preferably 60 to 160 ° C, and even more preferably 60 to 140 ° C. A coating film with superior separation characteristics of the coating film can be formed on the surfaces of the metal materials, and the 15 metal materials on which such a coating film is formed, are superior in terms of press molding characteristics. In cases where the aforementioned temperature, reached by the plates during drying, is less than 50 ° C, the film of 20 coating is sticky; therefore, such a low temperature is inconvenient. On the other hand, in cases where the temperature reached by the plates exceeds 180 ° C, the cost involved in drying increases so that such process is ineconomic. < yj ~? t rrmrim 1 - - «- ^ ***» ^.

When a coating film is formed by coating the surface of a metal material with the surface treatment agent of the present invention, this aforementioned surface treatment agent is applied and dried so that the amount of the coating film adhered after drying it is from 0.1 to 5 g / m2. This amount of adhesion of the coating film is preferably 0.2 to 4 g / m2, and is still more preferably 0.3 to 3 g / m2. In cases where the amount of adhesion of the layer of the resin coating film is less than 0.1 g / m2, satisfactory characteristics of the press molding can not be obtained. On the other hand, in cases where this amount exceeds 5 g / m2, the effect on the press molding characteristics becomes saturated, therefore, such large amount is not economical. The present invention will be described below in terms of working examples and comparative examples,. These working examples are described in order to illustrate the present invention and do not limit it in any way.

EXAMPLES Preparation of the Test Plates (1) Test Materials The commercially sold metal materials, shown below, were used as the test materials. Also, the size of the test materials was 200 mm x 300 mm. Electrogalvanized steel plates (EG) Plate thickness: 0.8 mm, amount of zinc plating = 20/20 (g / m2) Aluminum plates (AL) Plate thickness: 0.8 mm, series 5182 Steel plates laminated in cold (SPC) Plate thickness: 0.8 mm, JIS-G-3141. (2) Degreasing Treatment The aforementioned test materials were subjected to a degreasing treatment with Fine Cleaner 4336 (registered trademark, manufactured by Nihon Parkerizin Co Ltd), an alkali defatting agent of the silicate type. Specifically, the test materials were subjected to a spray treatment for 2 minutes at a degreasing agent concentration of 20 g / 1, and a temperature of 60 ° C, and washed with tap water for 30 seconds. aajtfj Preparation of the Surface Treatment Agents The Al to A8 copolymers were prepared by the copolymerization of the monomers shown in Table 1, in the proportions shown in Table 1 (the numbers in parentheses shown for the monomers in Table 1 indicate the weight ratios). The copolymerization was achieved by the emulsion polymerization, using an ordinary method, at room temperature. The copolymers were used as aqueous dispersions with a solids content concentration of 20% by weight. Al copolymers up to A8, shown in Table 1, and the lubricants Bl to B3, shown in Table 2, were mixed in the compositions and amounts shown in Table 3, while being agitated by means of a propeller stirrer, in the order shown, and the concentration of the solids content was adjusted by adding distilled water. In this manner, the metal surface treatment agents of Working Examples a through j and the metal surface treatment agents of Comparative Examples k through n, were prepared.

Table 1 Table 2 Table 3 1% by weight of the solids content of the respective components (a) and (b), in relation to the solids content (a) + (b) of the metal surface treatment agent. uk * M ** t * * *** M * ^ **** j - j.fM-J - J ^ tfcj-h-. * * * -;. ***. *. ? * ^ *. > J < »JL-JA- * m Method used to apply the surface treatment agents to the test plates. The respective surface treatment agents, prepared as described above, were applied to the aforementioned test plates of a bar coater and dried for 10 seconds at an atmospheric temperature of 240 ° C. The temperature reached by the plates in this case 100 ° C. The amount of adhesion of the surface treatment agent was adjusted by appropriately varying the concentration of the solids content of the surface treatment agent and the type of bar coater used. Coated Plate Performance Test (1) Press molding characteristics The test samples were cut to a size of 30 mm x 300 mm, and a flange test was carried out (tip end of flange 1 mm R, height of flange 4 mm, die holder 1 mm R, pressure joint load 500 kg, temperature 30 ° C). The rubbing surface was separated with a cellophane tape and an evaluation was made using the criteria shown below. Evaluation Criterion T: there is no adhesion of the coating film to the cellophane tape * ?? My..

O: very slight adhesion of the coating film to the cellophane tape ?: adhesion of the coating film to the cellophane tape, little damage of the coating film on the rubbing surface. H: extensive damage of the coating film on the rub surface. (2) Moisture Resistance The test samples were cut to a size of 70 mm x 150 mm and allowed to stand for 5 hours in an atmosphere at a temperature of 50 ° C and humidity of 95%. The external appearance, before and after the test, was evaluated using the criteria shown below. Evaluation Criteria T: there is no dissolution or color change of the coating film O: there is no dissolution of the coating film; however, the color change was observed: lightly dissolved coating film H: dissolved coating film. (3) Separation Characteristics of the Coating Film The test samples were cut to a size of 70 mm x 150 mm, and subjected to a treatment of degreased using the Fine Cleaner 4335 (registered trademark, manufactured by Nihon Parkering Co., Ltd.) a silicate-type alkali defatting agent. Specifically, the test samples were subjected to a spray treatment for 2 minutes, at a degreasing agent concentration of 20 g / 1, and a temperature of 60 ° C, and then washed with tap water. Following washing, the amount of the surface carbon in the test samples was measured using a LECO analyzer (surface carbon analyzer), and the degree of separation of the coating film was calculated using the formula shown below. An evaluation was then performed using the criteria shown below. Also, "before degreasing", "after degreasing" and "untreated plates" in the formula, indicate the respective amounts of carbon on the surfaces of the test samples. Degree of Separation of the Coating Film Degree of separation of the coating film (%) = [before degreasing - after degreasing) / (before degreasing - untreated plates)] x 100 Evaluation Criteria T: The degree of Separation of the coating film is 98% or greater ^ e ^^ A ^ ^^^^ t »ti ^ i t ^^^^^^ .i **. *» ***,] - • - rr-- O: The degree of separation of the coating film is 95% or greater, but less than 98% ?: The degree of separation of the coating film is 80% or greater, but less than 95% H: The degree of separation of the coating film is less than 80% As will be clear from the test results shown in the following Table 4, the working capacity, moisture resistance and separation characteristics of the coating film are all good in Working Examples 1 to 14, which use metal surface treatment agents of the present invention. On the other hand, in Comparison Examples 1 to 4, which use metal surface treatment agents outside these ranges of the present invention, materials that simultaneously satisfy all performance requirements for working capacity, resistance to moisture and separation characteristics of the coating film could not be obtained.

MU * - * - - .. ^ faüf, > ... ** * * ^ **. ** .-. *. - "TmiÉr-tiJii '~ ** ~ *** -" - J * r? ±? , Table 4 Thus, a coating film that is superior in terms of at least one of: moisture resistance and separation characteristics of the coating film, can be formed on the surfaces of the metal materials, by applying the treatment agent of the metal surface of the present invention to the surfaces of such metal materials and drying the applied agent 10. The methane materials in which they are formed m LWLmÉ * * áátki * ds * * 'ÍtMt -'- "- * ^^ - ** - *. * - * - r * ^ ** M * ...'. ^" JUA ^^. I * ^ **, * - *** »* said coating films are superior in terms of press molding characteristics. Also, since the coating films formed on the surfaces of the metal materials are superior in terms of moisture resistance, no blockage occurs during storage of the metal materials until the moment of press molding, yet if the humidity is not strictly controlled. Also, since the coating films formed in the 10 surfaces of the metal materials are superior in terms of the separation characteristics of the coating film, the metal surface treatment agent of the present invention performs the special characteristics of the materials, such as the 15 external appearance and color, etc., and can be used properly in the treatment of metal materials that require treatments after the process, such as phosphate treatments or treatments of aluminum, etc. While modalities have been illustrated and described 20 of the invention, it is not intended that these embodiments illustrate and describe all possible forms of the invention. Rather, the words used in the specification are words of description rather than limitation, and it will be understood that several words can be made 25 changes without departing from the spirit and scope of the invention.

Claims

CLAIMS 1. An agent for the treatment of a metal surface, which comprises: (A) a copolymer that includes (a) styrene and (b) a vinyl compound, with carboxyl groups, which can be copolymerized with styrene, and

(B) a lubricating agent, copolymer (A) has a weight ratio of component (a) to component (b) in the range of 1/9 to 9/1, with (a) + (b) being present in the polymer (A) in an amount of 30 to 100% by weight, and the ratio of (B) to (A) + (B), being from 2 to 30% by weight.
2. The metal surface treatment agent claimed in claim 1, wherein the lubricating agent (B) comprises at least one substance selected from the group consisting of paraffin wax, microcrystalline wax, polyethylene wax and polypropylene wax .
3. The metal surface treatment agent claimed in claim 1, wherein the glass transition temperature of the polymer (A) is 75 ° C or higher.
4. The metal surface treatment agent claimed in claim 2, wherein the glass transition temperature of the polymer (A) is 75 ° C or higher. I -J - ífi? I-p¡fÍ - i- iinf
5. A metal material treated on its surfaces, with a superior press molding work capability and / or coating film separation characteristics, which is formed by coating a surface of the metal material with a surface treatment agent. metal, which comprises: (A) a copolymer including (a) styrene and (b) a vinyl compound, with carboxyl groups, which can be copolymerized with styrene, and (B) a lubricant, the copolymer (A) ) has a weight ratio of component (a) to the component (b) in the range of 1/9 to 9/1, with (a) + (b) being present in the polymer (A) in an amount of 30 to 100% by weight, and the ratio of (B) to (A) + (B), being from 2 to 30% by weight, and then drying said treatment agent of the metal surfaces, with the amount of adhesion of the film, followed by drying, being from 0.1 to 5 g / m2.
6. The metal material of claim 5, wherein the lubricating agent (B) comprises at least one substance selected from the group consisting of paraffin wax, microcrystalline wax, polyethylene wax and polypropylene wax.
7. The metal material of claim 5, wherein the glass transition temperature of the polymer (A) is 75 ° C or higher. | Bg_l_tiÍa6-M-J --- S-ri-l-M-MMÍ¿-i ^ tf-i - ^^
8. The metal material of claim 6, wherein the glass transition temperature of the polymer (A) is 75 ° C or higher.
9. A method for the surface treatment of a metal material, said method comprises coating a surface of the metal material with the metal surface treatment agent of claim 1, and drying said metal surface treatment agent, to form a metal surface treatment agent. film from 0.1 to 5 g / m2, which adheres to the surface.
10. The method of claim 9, wherein the lubricating agent (B) comprises at least one substance selected from the group consisting of paraffin wax, microcrystalline wax, polyethylene wax and polypropylene wax.
11. The method of claim 9, wherein the glass transition temperature of the polymer (A) is 75 ° C or higher.
12. The method of claim 10, wherein the glass transition temperature of the polymer (A) is 75 ° C or higher. ? iárt * > ***, *, «, *. *» ~ - * a »'** aa« i MÍlÍiiiii - - - »* •• *. M