JPS638489A - Lubricant for metal cold working - Google Patents

Abstract

PURPOSE:An aqueous lubricant for cold working showing improved lubricating properties in use for metal press processing, rolling, wire drawing, drawing of steel tubing, etc., containing a specific thermosetting acrylic resin, wax, a surface active agent and water in a specific ratio. CONSTITUTION:An aqueous lubricant for cold working containing (A)10-35wt% thermosetting acrylic resin having -10-25 deg.C glass transition point, (B) 3-15pts. wt. wax, (C) 0.5-5.0pts.wt. surface active agent and (D) the rest of water in a weight ratio of the component A/B of 2-12. EFFECT:A coating film remaining on the metallic surface after cold working is readily removable with an alkali cleaner.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a 1121 lubricant for cold opening of metals in cold workings such as metal pressing, rolling, wire drawing, and handling of steel pipes. It is.

[Prior art]

Conventionally, when cold working metal, T! As the lubricant, lubricating oil with an extreme pressure agent or oiliness improver added is applied to those with a relatively low working degree, and diluted with an organic solvent in the case of a high working degree. A resin-based lubricant used as a lubricant is applied, and lubricating oil is further applied thereon.

[Problem that the invention seeks to solve]

In recent years, the uses of lubricants have diversified, and the problem has arisen that these lubricants may not be sufficient when cold working conditions are severe. Furthermore, resin-based lubricants that are diluted with organic solvents are not good for environmental hygiene, and
There are also risks such as fire. Further, the residual film cannot be easily removed with an alkaline cleaner after cold working, which has caused problems such as unsuitability for working sites.

Therefore, there has been a need for an rIi eraser for metals that exhibits excellent lubrication performance for intense cold working and that allows the film remaining on the metal surface to be easily removed with an alkaline cleaner after cold working.

[Means for solving problems]

As a result of intensive research to develop a lubricant that meets the above-mentioned needs, we found that a thermosetting acrylic resin with a glass transition point adjusted to 110 to 25 degrees Celsius (10 to 15 degrees Celsius), a wax 3 to 15 degrees Celsius, and an interface between The activator 05 to 5 parts and the rest contain water,
and the thermosetting acrylic resin/wax weight ratio is 2
When treated with an aqueous liquid adjusted to 12 to 12, dried at room temperature, heated and baked, it was possible to obtain a lubricating film superior to that obtained using conventional TII lubricants.

The thermosetting acrylic resin with a glass transition point of -10 to 15°C in the present invention has the general formula % [In the formula, the order of Ra, Rb, Rc, and Rd is random, and Ra is a vinyltoluene group, R
b is an acrylic ester obtained by the reaction of acrylic acid with a primary aliphatic alcohol having 1 to 12 carbon atoms, and/or an acrylic ester obtained by the reaction of methacrylic acid with a primary aliphatic alcohol having 3 to 12 carbon atoms; RC is a phosphoric acid ester compound of acrylic acid, methacrylic acid, maleic acid, itaconic acid, 2-hydroxyethyl methacrylate, and a phosphoric acid ester compound of 2-human O-oxypropyl methacrylate. , or one or more selected from alkali neutralized products thereof, in an amount of 1 to 15% by weight, l''
(d is selected from methacrylic acid 2-hydro 4: sylethyl, hydroxypropyl methacrylate, 2-hydroxylethyl acrylate, hydroxypropyl acrylate, N-medyrollacrylamide or its ester compound, diacetone acrylamide or glycidyl methacrylate) It is possible to use a thermosetting acrylic resin having 1 to 20 wt. Polymerize at -10 to 25°C. For example, a mixture of each seven polymer is polymerized at 50 to 60°C for 50 to 60°C.
A desired glass transition point can be obtained by carrying out emulsion polymerization for ~7 hours. Other polymerization methods include, for example,
Solution polymerization! Examples include turbid polymerization.

Depending on the polymerization method, a solvent other than water may be used; for example, ethanol, isopropyl alcohol, etc. may be used.

The waxes used in the present invention include petroleum paraffin wax, animal and vegetable oils, higher fatty acids, higher alcohols, higher fatty acids and higher alcohol esters, higher fatty acid amides,
Examples include amine salts of higher fatty acids, and it is preferable to use those with a melting point of 45° C. or higher in order to solidify the TII lubricant film. To raise the melting point, hydrogenation increases the
There is a way to eliminate double bonds.

Surfactants are used to emulsify and disperse wax in water, and examples of the surfactants include anionic surfactants and nonionic surfactants. Examples of anionic surfactants include sodium alkylnaphthalene sulfonate, sodium alkylbenzenesulfonate, and funnel oil. Examples of nonionic surfactants include polyoxyethylene alkyl ether (the alkyl group is a higher alcohol) type, polyester, etc. Examples include oxyethylene nonylphenol ethers, fatty acids and polyethylene glycol esters, fatty acids and sorbitan esters, and ethylene oxide adducts. Although a certain degree of emulsification and dispersion can be achieved using a surfactant, mechanical stirring such as a homogenizer may be used in combination to further improve the emulsifying property.

A solid 11 lubricant may be incorporated into the lubricant of the present invention. Examples of the solid lubricant include graphite, molybdenum disulfide, talc, Teflon, boron nitride, calcium carbonate, and melamine-isocyanuric acid adduct.

[Function] The reason for using a thermosetting acrylic resin is that the metal and tools generate heat during cold working of the metal. This heat generation further accumulates due to heavy working and continuous working. When a thermoplastic acrylic resin is used as a lubricant component, it forms a solid film at room temperature, but when the metal or tool is processed and the temperature exceeds the glass transition point, it becomes fluid. .

In this state, the ability to prevent direct contact between the metal and the tool is reduced, and if the processing conditions become severe, the tool will be squeezed out and seizure will occur.

Therefore, it is important to form a solid film that evaporates at high temperatures, and this problem was solved by using a thermosetting acrylic resin.

However, the disadvantage of normal thermosetting resins is that when the resin hardens, the resin film becomes hard, but due to plastic deformation, it becomes difficult for the resin film to follow the elongation of the metal. If the tool comes into direct contact with the tool, seizure is likely to occur. In addition, it is necessary to remove the rR slipping film after cold working, but it is difficult to remove the heat-cured film with alkali.To improve this, the resin electrical bridge has a self-crosslinking structure with good flexibility. The type is good, and the crosslinking rate is also reduced. However, in terms of the characteristic values of the resin itself, the softer it is, the better it stretches, so the film can more easily follow the expansion of the metal. Therefore, the lower the glass transition point is from 110 to 25°C, the softer and better the elongation. If the temperature is less than -10°C, the film becomes too soft and seizure is likely to occur during cold working. At temperatures above 25°C, the film becomes too hard and its ability to follow the elongation of the metal during metal processing decreases, and in the cold winter months, film forming properties tend to deteriorate, making it difficult to form a uniform film. difficult. Preferably it is 0-5°C.

Ra in the general formula of the thermosetting acrylic resin increases the hardness and tensile strength of the film, and is 20 to 70!
It is preferable to contain 1%. It is preferable that Rb contains 20 to 70% by weight of Rb, which gives the film softness and stretchability. RC improves adhesion with metals and emulsification dispersibility, and is preferably contained in an amount of 1 to 15%. Rd is necessary to improve adhesion to metals and to crosslink with the carboxyl group of RC and harden when heated to improve heat resistance, and preferably contains 1 to 20 mm% of gold.

If Ra is less than 20%, the hardness of the resin film is soft and the film is rubbed off during plastic working, causing seizure, which is not good. If it exceeds 70%, the glass transition point (TG) becomes too high, which deteriorates the film forming properties of the film at room temperature and causes seizure during plastic working, which is not good.

If Rb is less than 20%, TG// becomes too high and the film forming properties of the film at room temperature are poor, causing seizure during plastic working, which is not good. If it exceeds 70%, the hardness of the film becomes soft. During plastic working, the film is scraped off and seizure occurs.

In other words, Ra and Rb have contradictory characteristics, and R
Occurrence of seizure can be prevented by properly combining a and Rb.

Rc Less than 1%, ■ Adhesion to metal decreases.

■ The film cannot be removed using alkaline degreasing solution.

■ Rd hydroxyal4nyl methacrylate, N-
The crosslinking reaction with methylol acrylamide or glycidyl methacrylate is not promoted, resulting in a decrease in heat resistance.

If it exceeds 15%, (1) the viscosity of the treatment liquid becomes too high, resulting in poor workability and coating properties.

■ The resulting film has high θ absorption properties, and if left for a long period of time after film formation, the adhesion of the film will decrease due to moisture absorption.

Rd In 1% non-No. 1, ■ Heat resistance is poor due to insufficient crosslinking.

If it exceeds 20%, (1) the film becomes too cross-linked and loses its flexibility, and the film cannot follow the elongation of the metal during plastic working, causing seizure, which is not good. Hydroxyalkyl methacrylate is preferably 5 to 15%, and N-methylolacrylamide or glycidyl methacrylate is 1 to 5%.
is preferred.

The mixing ratio of the thermosetting acrylic resin and wax is a major factor, and mixing an appropriate amount of wax with the thermosetting acrylic resin improves the removability and lubrication of the resin film on the metal surface. Improve your sexuality. When the thermosetting acrylic resin/wax I ratio is less than 2, the adhesion of the film formed on the metal decreases, causing the film to break and seize during plastic deformation of the metal. Moreover, when it exceeds 12, the slipperiness decreases and the 1! E The friction becomes large and seizes up. Preferably, it is in the range of 4-6. The appropriate addition concentration of the surfactant in the lubricant treatment liquid is 1.71, as adding too much will reduce the lubricity, so consider the addition concentration necessary for dispersion and the 1.71 lubricity. If so, 0.5 to 5 parts are good. Examples of the surfactant include nonionic, anionic, cationic, and amphoteric surfactants. Preferred are nonionic and anionic types.

To apply the lubricant treatment liquid of the present invention to metal, pre-degreased metal is treated at room temperature by a method such as dipping, spraying, brushing, pouring, or l-coater, and then dried. However, when drying, please dry it naturally beforehand.
It is preferable to heat and bake at a temperature of 120° C. to 120° C. since this improves adhesion. The thickness of the film to be formed changes depending on the plastic deformation method.
5-59/Trt1 vibrator-like strength 1) [In the case of 1 process, avoid changing the concentration of the processing solution so that it becomes 5-30 g/bottom to avoid processing formation.

Example 1 SO3304 stainless steel F14 pipe was pickled, washed with water,
Oil immersion treatment (20°C, 1 minute) with a treatment solution containing thermosetting acrylic resin and wax shown in Tables 1 and 2, followed by draining for 1 hour and air drying, followed by 30°C with hot air at 100°C. Dry for minutes to form a solid film of 10-15 U/bottle. Drawing was performed using a stretched tube, and the appearance after drawing was observed and the method for removing the lubricant film was investigated.

The results are shown in Table 3.

Tube stretching conditions: Stainless steel pipe 25φX 2.5t X 200O
N (rtm)・Processing degree 32
'%・Drawing speed 17.8m/min or Sυ
A test plate was prepared using the S 30450 x 100 x 0.8 mtn material using the same treatment solution and conditions, and the friction coefficient and number of sliding movements until seizure were measured using the Bowden test. Table 4 is accepted.

(Bauden test, conditions) 1F: 5UJ-25φ 1, η Single: 5 sliding speed: IOM/SeC Shop movement width: 30mm Test 5; SO330450X 100X O, 8
〃+m test dehydration: 25°C Comparative Example 1 The same stainless steel pipe as in the example was pickled, washed with water, and treated with a salt film chemical conversion treatment (FB-A (Nippon Vercalizing Co., Ltd. product) 35g/N, AC16, 1g/fJ.

90°C for 10 minutes], washed with water, then lubricated [Bondalube 235 (product of Nippon Bar Rising Co., Ltd.) 70g/fl, 80°C for 3 minutes], dried, and then prepared as in Example 1. Additional usage using similar drawing conditions
I conducted the Bauden test. The results are shown in Tables 3 and 4.

Comparative Example 2 The same stainless steel pipe as in Example 1 was pickled, washed with water, dried, and then treated with a solvent-diluted resin (Hangstarfushi 111 QD).
After applying lubricating oil LJ-1 (Hangstarfushi product)], diluted 72 times with toluene, immersed in oil (room temperature for 1 minute), and air-dried for 1 day. 11 J, riverside processing, and Bowden test under the same drawing conditions.

The resin adhesion amount is 10 bi/m. The results are shown in Tables 3 and 4.

Comparative Example 3 Lubricant of Example 1 ff1l! l! Processing was performed under the same conditions as in Example 1 except that the crosslinking component Rd of resin Na 1 was removed using liquid composition No. 1, and subsequent processing and Bowden test were performed. The resin film thickness was 10 to 15 g/bottom.

Comparative Example 4 A treatment was carried out under the same conditions as in the lζ method in Example 1, except that the crosslinking component Rd of the resin Nα2 was removed from the ill lubricant treatment liquid composition No. 3 in Example 1, and handling processing and Bauden test were performed. The resin pressure was 110J to +5LJ/bottom.

The results are shown in Tables 3 and 4.

Table 3 Test results Bowden test on drawing performance of stainless steel vibrator with working degree of 33% Table 4 *1: The smaller the value, the better the slipperiness.

*2: The higher the number of sliding movements, the better the anti-seizure performance.

Removal test of lubricating film after drawing After drawing, the stainless steel m-tube was immersed for 1 hour in an alkaline degreasing aqueous solution at 90°C containing 3% caustic soda, 1.5% sodium tripolyphosphate, and a surfactant. The removability was visually judged.

As is clear from Table 3, the lubricating film formed on the surface of the stainless steel vibrator by the lubrication treatment method of the present invention showed superior lubricating effect in the handling test compared to the comparative example. In addition, the removability of the lubricant film remaining on the surface of the steel plate after drawing was excellent in both examples as it was completely removed, whereas in the comparative example the removability was extremely poor and the result was far inferior. showed that. Also, as is clear from Table 4, '!' formed on the surface of the stainless steel plate. The II synovial film showed superior S friction coefficient (the lower the slipperiness, the better the slipperiness) and abrasion seizure resistance compared to the comparative example in the Bauden test.

(Effects of the Invention) When a metal is treated with the cold working IIjl?11 treatment liquid of the present invention and dried to form a solid film of 0.5 to 309/m on the surface, cold working In the initial stage, the solid film exhibits sufficient lubricity and cannot be peeled off even during ironing, so the film remains on the surface of the processed gold layer, preventing contact between the metal and the mold tool.In the deformation process, the metal Due to the heat of deformation and heat of friction, the temperature of the metal surface rises to 100-150°C, which improves the elongation of the resin film, which follows the deformation of the metal well and does not cause film breakage, so no seizure occurs. After the preliminary processing, the residual bacteria film can be easily removed with an alkaline cleaner, resulting in excellent effects such as being suitable for workability at the processing site.

Patent applicant: Japan Pariki Rising Co., Ltd. Agent
Person Akimoto 11 Male ・1
1st and 2nd

Claims (2)

[Claims] (1) 10 to 35 parts by weight of thermosetting acrylic resin whose glass transition point is adjusted to -10 to 25°C and 3 to 1 part of wax
5 parts by weight of surfactant, 0.5 to 5.0 parts by weight of surfactant, and the remainder contains water, and the thermosetting acrylic resin/wax weight ratio is adjusted to 2 to 12. A lubricant for cold working of metals. (2) The thermosetting acrylic resin has the general formula -(Ra-
Rb-Rc-Rd)-_n [In the formula, the order of Ra, Rb, Rc, and Rd is random, n is the degree of polymerization and is 1000 to 50,000, and Ra is a vinyltoluene group, a styrene group, or a methyl methacrylic group. 20 to 70% by weight of one or more selected from acrylonitrile and acrylonitrile groups, Rb is obtained by reaction of acrylic acid with a primary aliphatic alcohol having 1 to 12 carbon atoms. A methacrylic ester obtained by reacting an acrylic ester and/or methacrylic acid with a primary aliphatic alcohol having 3 to 12 carbon atoms is
0% by weight, Rc is acrylic acid, methacrylic acid,
One or more selected from maleic acid, itaconic acid, phosphoric acid ester compounds of 2-hydroxyethyl methacrylate, phosphoric acid ester compounds of 2-hydroxypropyl methacrylate, or alkali neutralized products thereof. 15% by weight, Rd is 2-hydroxylethyl methacrylate, hydroxypropyl methacrylate,
It consists of 1 to 20% by weight of one or more selected from 2-hydroxylethyl acrylate, hydroxypropyl acrylate, N-methylolacrylamide or its ester compound, diacetone acrylamide, or glycidyl methacrylate. ] The lubricant for cold working of metals according to claim 1, characterized in that it has the following.