JP2020186326A - Lubricant composition for plasticity processing - Google Patents

Abstract

To provide a lubricant composition for plasticity processing that has excellent lubricity and releasability.SOLUTION: The lubricant composition for plasticity processing comprises (a) graphite, (b) silicone, (c) a water-soluble polymer, and (d) water.SELECTED DRAWING: None

Description

The present invention relates to a lubricant composition for plastic working.

Generally, when plastic working using a die such as forging, rolling, wire drawing and extrusion is performed on a material to be processed such as carbon steel, alloy steel and non-ferrous metal in a warm region or a hot region. , A lubricant is used to improve the lubricity and releasability between the mold and the material to be processed. Such lubricants are disclosed in Patent Documents 1-5.

Patent Document 1 describes a lubricant for hot plastic working, which contains (a) graphite, (b) an inorganic compound containing a zirconium element, and (c) a silicate compound having a layered structure.

Patent Document 2 describes a lubricant composition for hot plastic working, which contains graphite powder and at least one powder selected from oxides of tin, lead, zinc, calcium, copper and aluminum. Has been done.

Patent Document 3 describes a graphite-based water-dispersed lubricant composition for hot plastic working, which contains graphite powder, at least one aluminum compound, and at least one water-soluble organic polymer compound. ing.

Patent Document 4 describes a water-based lubricant for plastic working, which comprises a solid lubricant, water for dispersing the solid lubricant, and a cationic surfactant for positively charging the surface of the solid lubricant. ing.

Patent Document 5 describes a lubricant for hot forging in which one or two types of calcium sulfate or barium sulfate are uniformly dispersed in an aqueous colloidal graphite solution containing graphite.

The above-mentioned lubricants are all graphite-based lubricant compositions for plastic processing, and the graphite-based plastic processing lubricant compositions include graphite, inorganic compounds containing zirconium elements, tin, and the like. Inorganic powders such as lead, zinc, calcium, copper and aluminum oxides, and aluminum compounds; cationic surfactants; silicate compounds having a layered structure, and inorganic salts such as calcium sulfate and barium sulfate. And.

Japanese Unexamined Patent Publication No. 2003-313573 Japanese Unexamined Patent Publication No. 5-125386 Japanese Unexamined Patent Publication No. 6-256790 Japanese Unexamined Patent Publication No. 2008-231160 JP-A-54-74255

However, the conventional graphite-based composition processing lubricant composition as described above has deteriorated releasability and shortened the life of the mold due to direct contact between the material to be processed and the mold in a warm environment. May have an adverse effect. Therefore, there is room for further improvement from the viewpoint of providing a graphite-based plastic working lubricant composition having excellent lubricity and releasability.

Therefore, one aspect of the present invention is to provide a graphite-based plastic working lubricant composition having excellent lubricity and releasability.

As a result of intensive studies to solve the above problems, the present inventors have found that a graphite-based plastic working lubricant composition containing silicone and water is excellent in lubricity and releasability, and the present invention has been made. Has been completed. That is, the present invention includes the following aspects.
[1] A lubricant composition for plastic working, which comprises (a) graphite, (b) silicone, (c) a water-soluble polymer, and (d) water.
[2] The lubricant composition for plastic working according to [1], wherein the silicone (b) is a silicone emulsion.
[3] The mixture contains 0.3 to 30% by weight of (a) graphite, 0.01 to 10% by weight of the silicone (b), and 0.02 to 20% by weight of the water-soluble polymer (c). ] Or [2]. The lubricant composition for plastic working.
[4] A plastic working method in which the lubricant composition for plastic working according to any one of [1] to [3] is used in the plastic working of a material to be worked.
[5] The plastic working method according to [4], wherein the material to be worked is plastically worked in a temperature range of 200 to 1250 ° C.
[6] The plastic working method according to [4] or [5], wherein the material to be worked is an iron-based metal.

According to one aspect of the present invention, it is possible to provide a lubricant composition for plastic working having excellent lubricity and releasability.

Hereinafter, embodiments of the present invention will be described in detail. However, the present invention is not limited to this, and various modifications can be made within the scope described, and the present invention also relates to an embodiment obtained by appropriately combining the technical means disclosed in each of the different embodiments. Included in the technical scope of. Unless otherwise specified in the present specification, "A to B" representing a numerical range means "A or more and B or less".

[1. Lubricant composition for plastic working]
The lubricant composition for plastic working according to an embodiment of the present invention (hereinafter, also simply referred to as “lubricant composition”) includes (a) graphite, (b) silicone, and (c) a water-soluble polymer. (D) Includes water. The lubricant composition for plastic working according to an embodiment of the present invention has excellent lubricity and releasability due to the above-mentioned structure.

In the present specification, the expression "excellent in lubricity" means that when a lubricant composition is used when processing a material to be processed by using a mold, friction between the mold and the material to be processed is used. Means that can be reduced. As a result, the wear of the mold can be reduced, and a better plastic working product can be obtained. As used herein, lubricity is assessed by comparing the lengths of axial elongation in the spike test described in the Examples. When a lubricant composition having excellent lubricity is used, for example, when forging, a forged product having a longer axial elongation can be obtained as compared with a forged product obtained when a lubricant composition having poor lubricity is used. it can.

In the present specification, the expression "excellent in mold releasability" means that when a lubricant composition is used when processing a material to be processed using a mold, the processed material to be processed and the mold are used. It means that the processed material to be processed is released from the mold without being seized. In the present specification, the releasability is evaluated by confirming the seizure of the processed material to be processed in the spike test described in the examples.

<(A) Graphite>
The lubricant composition for plastic working according to an embodiment of the present invention contains graphite. Since the lubricant composition for plastic working according to an embodiment of the present invention contains graphite, lubricity and releasability can be improved.

Graphite may be either a natural product or a synthetic product. The average particle size of graphite may be appropriately determined depending on the shape and size of the material to be processed, the processing temperature, or the amount of processing deformation. For example, the average particle size of graphite is preferably 100 μm or less, more preferably 0.5 to 30 μm. When the average particle size of graphite is within the above range, sedimentation (100 μm or more) and aggregation (0.5 μm or less) caused by a decrease in the dispersibility of graphite in the liquid can be suppressed, which is preferable.

In one embodiment of the present invention, the blending amount of graphite is preferably 0.3 to 30% by weight, more preferably 0.5 to 25% by weight, based on the lubricant composition. When the blending amount of graphite is within the above range, lubricity and releasability can be improved.

<(B) Silicone>
The lubricant composition for plastic working according to an embodiment of the present invention contains silicone. Since the lubricant composition according to the embodiment of the present invention contains silicone, between the mold and the material to be processed in a harsh environment of warm or hot plastic working of the material to be processed. It is possible to form a tough dry film in the above, suppress seizure, and improve mold releasability.

Silicone is a general term for those in which the main skeleton of the bond is a siloxane bond and an organic group is bonded to it. The type of silicone is not particularly limited, but is dimethyl silicone, alkyl-modified silicone, fluoroalkyl-modified silicone, phenyl-modified silicone, aralkyl-modified silicone, alkyl-aralkyl-modified silicone, phenol-modified silicone, polyether-modified silicone, carbinol-modified silicone, amino-modified. Silicone, epoxy-modified silicone, alicyclic epoxy-modified silicone, carboxyl-modified silicone, carboxylic acid anhydride-modified silicone, mercapto-modified silicone, alcohol-modified silicone, alkoxy-modified silicone, ester-modified silicone, higher fatty acid ester-modified silicone, acrylic-modified silicone, Examples thereof include methacryl-modified silicone, higher fatty acid amide-modified silicone, and hydrogen (hydrogen) -modified silicone. From the viewpoint of releasability and economy, dimethyl silicone, alkyl-modified silicone, aralkyl-modified silicone, alkyl-aralkyl-modified silicone, amino-modified silicone, and epoxy-modified silicone are particularly preferable.

In one embodiment of the present invention, the blending amount of silicone is preferably 0.01 to 10% by weight, more preferably 0.02 to 7.5% by weight, as an active ingredient, based on the lubricant composition. When the blending amount of silicone is within the above range, the releasability can be improved.

As the silicone, it is preferable to use a silicone emulsion in which the silicone is uniformly dispersed in water using a surfactant. By using a silicone emulsion as the silicone, the silicone can be easily and uniformly dispersed in the lubricant composition.

As the silicone emulsion, a mixed solution in which silicone is uniformly dispersed in a surfactant may be used, or a conventionally known commercially available product may be used. Examples of the commercially available products include HN-8758 (manufactured by Momentive Performance Materials GK, non-volatile component 52-55% by weight, emulsion of alkyl aralkyl-modified silicone), TSM6362 (manufactured by Momentive Performance Materials GK, non-volatile component). 57% by weight, alkyl aralkyl-modified silicone emulsion), YMR7212 (Momentive Performance Materials GK, 32% by weight non-volatile component, dimethyl silicone emulsion), XS65-B6413 (Momentive Performance Materials GK, Non-volatile component 30% by weight, amino-modified silicone emulsion), BY-22-752 (manufactured by Toray Dow Corning Co., Ltd., non-volatile component 52-55% by weight, alkyl-modified silicone emulsion), FZ-4634EX (Toray Dow Corning) Co., Ltd., non-volatile component 43% by weight, amino-modified silicone emulsion), BY-22-818 (Toray Dow Corning Co., Ltd., non-volatile component 40% by weight, epoxy-modified silicone emulsion), SSH-50 (Shinetsu Chemical Co., Ltd.) Industrial Co., Ltd., non-volatile component 52-55% by weight, alkyl-modified silicone emulsion), SSH-40 (manufactured by Shin-Etsu Chemical Industry Co., Ltd., non-volatile component 52-55% by weight, alkyl-modified silicone emulsion), KM-9737A ( Shin-Etsu Silicone Co., Ltd., non-volatile component 33% by weight, dimethyl silicone emulsion), POLON-MF-51 (Shin-Etsu Silicone Co., Ltd., non-volatile component 39% by weight, amino-modified silicone emulsion), X-51-1264 (Shin-Etsu) Silicone Co., Ltd., 32% non-volatile component, epoxy-modified silicone emulsion) and the like.

In one embodiment of the present invention, the blending amount of the silicone emulsion is appropriately determined in consideration of the amount of the non-volatile component in the silicone emulsion and the desired blending amount of silicone.

The surfactant is not particularly limited, and any of a cationic surfactant, an anionic surfactant, and a nonionic surfactant may be used. As the surfactant, a conventionally known commercially available product can be used. Examples of the commercially available product include the Catiogen (registered trademark) series (manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd., a cationic surfactant).

<(C) Water-soluble polymer>
The lubricant composition for plastic working according to an embodiment of the present invention contains a water-soluble polymer.

The water-soluble polymer thickens when dissolved in water. When the lubricant composition for plastic working according to an embodiment of the present invention is spray-coated on a high-temperature mold, the water-soluble polymer functions as a binder component, so that it is considered that the adhesion efficiency can be improved. .. Therefore, it is possible to obtain a lubricant composition having excellent adhesiveness that forms a homogeneous and strong hard lubricating film having heat resistance even in a harsh environment of warm or hot plastic working.

In the present specification, the expression "excellent in adhesion" means that when the lubricant composition is applied to the surface of the mold, the adhesion efficiency of each component is improved and at the same time, the lubricant is firmly adhered to the surface of the mold. It means that a lubricating film is formed.

Water-soluble polymers include alkali metal salts of polymaleic acid-based resins, cellulose derivatives, alkali metal salts of polyacrylic acid or polysulfonic acid, resin emulsions, polyvinylpyrrolidone, polyvinyl alcohol and natural water-soluble polymers (starch, casein, gelatin, Arabia). Rubber, etc.). From the viewpoint of adhesiveness, alkali metal salts of polymaleic acid-based resins, cellulose derivatives, alkali metal salts of polyacrylic acid or polysulfonic acid, and resin emulsions are particularly preferable. These may be used alone or in combination of two or more.

Examples of the polymaleic acid-based resin include polymers such as isobutylene / maleic anhydride copolymer, styrene / maleic anhydride copolymer, methyl vinyl ether / maleic anhydride copolymer, and α-methylstyrene / maleic anhydride copolymer. Can be mentioned. These polymers may be imide-modified or ammonia-modified. Alkali metals include, for example, sodium and potassium. Specifically, an alkali metal salt is formed by sodium hydroxide or potassium hydroxide to make it water-soluble. Further, the alkali metal salts of these polymaleic acid-based resins may be used alone or in combination of two or more.

Examples of the cellulose derivative include methyl cellulose, ethyl cellulose, hydroxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, sodium carboxymethyl cellulose salt, sodium hydroxymethyl cellulose salt and the like. Further, these cellulose derivatives may be used alone or in combination of two or more.

Examples of the alkali metal salt of polyacrylic acid or polysulfonic acid include sodium polyacrylate, potassium polyacrylate, and sodium salt of β-naphthalene sulfonic acid formarin condensate. For these, conventionally known commercially available products can be used. Further, these components may be used alone or in combination of two or more.

As the resin emulsion, resin emulsions such as acrylic type, styrene type, styrene-acrylic type, urethane type, urethane-acrylic type, ethylene-vinyl acetate type and polyester type can be used. For these, conventionally known commercially available products can be used. Further, these components may be used alone or in combination of two or more.

In one embodiment of the present invention, the blending amount of the water-soluble polymer is preferably 0.02 to 20% by weight, more preferably 0.03 to 15% by weight, based on the lubricant composition. It is more preferably 05 to 10% by weight. When the blending amount of the water-soluble polymer is within the above range, when the lubricant composition for plastic working according to the embodiment of the present invention is applied to the surface of the mold, the adhesion efficiency of each component is improved and at the same time, the gold A lubricating film that firmly adheres to the mold surface can be formed.

<(D) Water>
The lubricant composition for plastic working according to an embodiment of the present invention contains water.

The water is not particularly limited as long as each component can be uniformly dissolved or dispersed, but ion-exchanged water or purified water such as pure water is preferable.

In one embodiment of the present invention, the blending amount of water is the balance obtained by subtracting the blending amount of components other than water from the lubricant composition.

<Other ingredients>
The lubricant composition for plastic working according to an embodiment of the present invention may contain other components other than (a) to (d) as long as the effects of the present invention are not adversely affected. Examples of the other components include alkali metal salts of inorganic acids, surfactants, dispersants, extreme pressure additives, metal corrosion inhibitors, preservatives and defoamers.

[2. Manufacturing method and usage method of lubricant composition for plastic working]
The lubricant composition for plastic working according to an embodiment of the present invention is produced by mixing and stirring each of the above-mentioned components.

In the lubricant composition for plastic working according to the embodiment of the present invention, the following combinations can be mentioned as preferable combinations of the blending amounts of the respective components.

It contains (a) 0.3 to 30% by weight of graphite, (b) 0.01 to 10% by weight of silicone, and (c) 0.02 to 20% by weight of a water-soluble polymer.

The lubricant composition for plastic working according to an embodiment of the present invention may be used as it is as a lubricant, or may be used after being diluted with water or the like at an arbitrary dilution ratio.

The lubricant composition for plastic working according to an embodiment of the present invention is used for plastic working of a material to be worked. That is, the present invention includes a plastic working method using a lubricant composition for plastic working according to an embodiment of the present invention.

The material to be processed is not particularly limited as long as it can be plastically worked. Examples of the material to be processed include iron-based metals such as carbon steel, chrome molybdenum steel, manganese chrome steel, and stainless steel, aluminum (A-5052, A-6063), and magnesium (AZ-31, AZ-61). Non-ferrous metals such as are preferably used for plastic machining. An iron-based metal is preferable. The plastic working is preferably performed in a warm region or a hot region. Further, examples of plastic working include, but are not limited to, forging, extrusion, rolling, pressing, wire drawing, and rotary molding such as spinning. The lubricant composition for plastic working according to an embodiment of the present invention can be effectively used as a lubrication release agent for warm and hot forging. When the lubricant composition is used as a lubricating mold release agent for warm and hot forging, it can be used in the same manner as a conventionally known lubricating mold release agent for warm and hot forging. The temperature range between warm and hot is 200 to 1250 ° C, preferably 600 to 1250 ° C.

The method for applying the lubricant composition for plastic working according to the embodiment of the present invention to the mold is not particularly limited as long as it can be uniformly applied to the surface of the mold, and examples thereof include spray spraying. When the lubricant composition for plastic working according to an embodiment of the present invention is applied to the surface of a mold, solution components such as water evaporate due to the heat of the mold to form a lubricating film. During plastic working, the temperature of the mold rises due to the metal contact between the mold and the material to be processed, but the evaporation of water removes heat from the mold immediately after spraying and cools it. As a result, the mold temperature during continuous machining can be maintained, leading to an improvement in mold life.

The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims, and the embodiments obtained by appropriately combining the technical means disclosed in the different embodiments. Is also included in the technical scope of the present invention.

Hereinafter, the present invention will be specifically described with reference to Examples, but the present invention is not limited to these Examples.
[1. Preparation of lubricant composition]
<Example 1, Examples 4 to 11, Examples 14 to 23>
CMC Daicel 1150 was added to water and heated at 40 to 60 ° C. to dissolve it. After cooling to room temperature, Demol NL was added to the aqueous solution and mixed, graphite was added, and the mixture was sufficiently stirred and mixed. Further, silicone and sodium carbonate were added, and the mixture was thoroughly stirred and mixed. In this way, the lubricant compositions for plastic working of Examples 1, 4 to 11 and 14 to 23 were prepared. The specifically added components and blending amounts are as shown in Tables 1 and 2.

<Example 2>
2.4 parts by weight of CMC Daicel 1150 was added to water and heated at 40 to 60 ° C. to dissolve it. After cooling to room temperature, 24 parts by weight of graphite was added to the aqueous solution, and the mixture was sufficiently stirred and mixed. Further, 3.7 parts by weight of HN-8758 and 1.9 parts by weight of sodium carbonate were added, and the mixture was sufficiently stirred and mixed. In this way, the lubricant composition for plastic working of Example 2 was prepared. The specifically added components are as shown in Table 1.

<Example 3>
After adding 2.4 parts by weight of Demol NL to water and mixing, 24 parts by weight of graphite was added to the aqueous solution, and the mixture was sufficiently stirred and mixed. Further, 3.7 parts by weight of HN-8758 and 1.9 parts by weight of sodium carbonate were added, and the mixture was sufficiently stirred and mixed. In this way, the lubricant composition for plastic working of Example 3 was prepared. The specifically added components are as shown in Table 1.

<Examples 12 to 13>
After NaOH was added to water to prepare a solution, Isovan 04 was added and dissolved by a neutralization reaction while heating and stirring the solution at 40 to 100 ° C. After Isovan 04 was dissolved, CMC Daicel 1150 was added and heated at 40 to 60 ° C. to dissolve. After cooling to room temperature, Demol NL was added to the aqueous solution and mixed, graphite was added, and the mixture was sufficiently stirred and mixed. Further, silicone and resin emulsion were added, and the mixture was sufficiently stirred and mixed. In this way, the lubricant compositions for plastic working of Examples 12 to 13 were prepared. The specific components added and the blending amount are as shown in Table 2.

<Comparative example 1>
Proheight AS-6 is a graphite-based lubricant manufactured by Nippon Graphite Co., Ltd.

<Comparative example 2>
LUBRODAL F-827 is a graphite-based lubricant manufactured by Fuchs.

<Comparative Examples 3 to 10>
Comparative Examples 3 to 10 in the same manner as in Examples 1, 4 to 11, 14 to 23, or 12 to 13 except that the type and blending amount of each component were changed as shown in Table 3. Lubricants composition was prepared.

The unit of the numerical value indicating the blending amount of each component shown in Tables 1 to 3 is% by weight. Further, in Tables 1 to 3, the numerical values shown in parentheses for the component (b) and the aqueous sodium silicate solution represent the blending amount converted into the non-volatile component (that is, the active ingredient).

Details of each component shown in Tables 1 to 3 are as follows.

<(A) Component (graphite)>
Graphite: Graphite powder <(b) component (silicone)>
HN-8758: Momentive Performance Materials GK, non-volatile component 52-55% by weight, alkyl aralkyl-modified silicone emulsion TSM6362: Momentive Performance Materials GK, non-volatile component 57% by weight, alkyl aralkyl-modified silicone Emulsion YMR7212: Momentive Performance Materials GK, non-volatile component 32% by weight, dimethyl silicone emulsion XS65-B6413: Momentive Performance Materials GK, non-volatile component 30% by weight, amino-modified silicone emulsion BY -222-752: Toray Dow Corning Co., Ltd., non-volatile component 52-55% by weight, alkyl-modified silicone emulsion FZ-4634EX: Toray Dow Corning Co., Ltd., non-volatile component 43% by weight, amino-modified silicone emulsion BY -222-818: Toray Dow Corning Co., Ltd., 40% by weight non-volatile component, epoxy-modified silicone emulsion SSH-50: Shin-Etsu Chemical Industry Co., Ltd., 52-55% by weight non-volatile component, alkyl-modified silicone emulsion SSH- 40: Shinetsu Chemical Industry Co., Ltd., non-volatile component 52-55% by weight, alkyl-modified silicone emulsion KM-9737A: Shin-Etsu Silicone Co., Ltd., non-volatile component 33% by weight, dimethyl silicone emulsion POLON-MF-51: Shin-Etsu Silicone Co., Ltd., non-volatile component 39% by weight, amino-modified silicone emulsion X-51-1264: Shin-Etsu Silicone Co., Ltd., non-volatile component 32%, epoxy-modified silicone emulsion <(c) component (water-soluble polymer)>
CMC Daicel 1150: Daicel Fine Chem Ltd., Carboxymethyl Cellulose Isovan (Registered Trademark) 04: Kuraray Co., Ltd., Aron Isobutylene Anhydrous (Registered Trademark) A-7075: Toa Synthetic Co., Ltd. ) NL: Sodium salt of β-naphthalinsulfonic acid formalin condensate manufactured by Kao Corporation <alkali metal salt of inorganic acid>
Sodium silicate aqueous solution: No. 2 (nonvolatile component 40-43% by weight)
Sodium carbonate: Wako Pure Chemical Industries, Ltd. <Other ingredients>
Zirconium silicate: manufactured by Daiichi Rare Element Chemistry Co., Ltd., MZ-1000B
Sepiolite: Ade Plus SP manufactured by Mizusawa Industrial Chemicals Co., Ltd.
Alumina (aluminum oxide): Reagent grade manufactured by Yoneyama Yakuhin Kogyo Co., Ltd. Barium sulfate: Made by Sakai Chemical Industry Co., Ltd., Variace B-35
Catiogen (registered trademark) ES: Cationic surfactant Proheit AS-6 manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd .: Graphite-based lubricant manufactured by Nippon Graphite Co., Ltd. LUBRODAL F-827: Graphite-based lubricant manufactured by Fuchs Co., Ltd. <(d) component (Wed)>
Water: Ion-exchanged water [2. Evaluation test〕
The lubricity and releasability of the lubricant composition were evaluated by a spike test. The test conditions were as follows.

<Axis elongation>
Each lubricant composition shown in Tables 1 to 3 was diluted with water at an arbitrary ratio. A diluted lubricant composition was spray-coated on a spike test mold having a heating temperature of 150 ° C. under the conditions of a spray pressure of 0.3 MPa, a spray distance of 300 mm, and a spray amount of 4 cc. After that, a test piece (material: S45C, dimensions: φ25 mm × 30 mm) heated to 1200 ° C. was set in a spray-coated spike test die, and the test piece was used with a 150t crank press (manufactured by Komatsu Industries Corp.). Was press-molded. The height (axial elongation or axial length portion) of the molded test piece was measured. The measurement results are shown in Tables 1 to 3.

<Burn on the mold>
When the test piece was molded as described above, it was evaluated whether or not the test piece was seized on the mold according to the following criteria. By this evaluation, it is possible to evaluate whether or not the lubricant composition is excellent in releasability. The evaluation results are shown in Tables 1 to 3.
◯: The molded test piece is removed from the mold without being seized on the mold.
X: The molded test piece is seized on the mold, and the test piece does not come off from the mold or is hard to come off.

From the results of Examples 1 to 23, it can be seen that the lubricant composition for plastic working containing graphite, silicone, a water-soluble polymer, and water has excellent lubricity and releasability. From the results of Comparative Examples 3 to 10, it can be seen that the silicone-free lubricant for plastic working is inferior in releasability.

Comparative Examples 1 and 2 correspond to the results of conventionally used graphite-based plastic working lubricants. Comparing Comparative Examples 1 and 2 with Examples 1 to 23, the lubricant for plastic working according to the embodiment of the present invention has higher lubricity and separation than the conventionally used graphite-based lubricant for plastic working. It can be seen that the mold is excellent.

The present invention can be used as a lubricant when plastic working a material to be processed is performed in a warm region or a hot region.

Claims (6)

A lubricant composition for plastic working, which comprises (a) graphite, (b) silicone, (c) a water-soluble polymer, and (d) water. The lubricant composition for plastic working according to claim 1, wherein the silicone (b) is a silicone emulsion. Claim 1 or 2 containing 0.3 to 30% by weight of (a) graphite, 0.01 to 10% by weight of (b) silicone, and 0.02 to 20% by weight of the (c) water-soluble polymer. The lubricant composition for plastic working according to. A plastic working method in which the lubricant composition for plastic working according to any one of claims 1 to 3 is used in the plastic working of a material to be worked. The plastic working method according to claim 4, wherein the material to be worked is subjected to plastic working in a temperature range of 200 to 1250 ° C. The plastic working method according to claim 4 or 5, wherein the material to be processed is an iron-based metal.