JPS5861189A - Lubricant composition for plastic working - Google Patents

Abstract

PURPOSE:To provide the titled non-polluting composition which facilitates the plastic working of steel only by applying to the steel without necessitating any surface treatment with chemical reaction, by mixing a lubrication oil with a sulfur compound selected from carbamic acid salt and benzothiazole compound. CONSTITUTION:The objective lubricant composition contains a lubrication oil and at least one sulfur compound selected from the carbamic acid salt of formulaI(R and R' are 1-24C hydrocarbon group; M is Zn, Na, Pb, Mo, Cu, Fe, Se, Te, or Ni) and benzothiazole compound of formula II (X is halogen, mercaptan, sulfide, N-containing group, amino, morpholino, carboxyl, or nitrile). The amount of the sulfur compound is preferably 0.5-20wt% of the mineral oil, synthetic oil or their mixture.

Description

[Detailed Description of the Invention] The present invention provides excellent processing performance that facilitates plastic working of steel materials by simply applying it to the steel materials without requiring any surface treatment by chemical reaction. The present invention relates to lubricant compositions.

Conventionally, in drawing, drawing, extrusion, etc., processing oils have been used as lubricating oils for cold forging of steel materials, such as mineral oil mixed with fatty acid ester oil, and wax, molybdenum disulfide, graphite, metal soap, etc. added to the above mixed processing oils. Processing was done by applying processing oil to the surface of the material. These methods are not fully satisfactory in terms of processing performance, especially for molded products with large plastic deformation or molded products with complex shapes, because the formation of a lubricating oil film and the introduction of solid lubricant are insufficient. Ta.

In addition, there are methods of coating the steel surface with polyvinyl chloride, nylon, chlorosulfonated polyethylene, a mixture of polysulfide and polyvinyl chloride, a mixture of graphite fluoride and polyimide 2, etc., but the surface finish, workability, etc.
There is nothing that is fully satisfactory in terms of machining performance, etc.

On the other hand, as a lubricant for cold working of steel materials, a method of coating the surface of the steel material with a lubricating film through a chemical reaction is widely used. One such method is to coat metal soaps after treatment with phosphoric acid or ganoate. Cover like this]
In forming the coating, it is necessary to control the chemical reaction, adjust the heating and concentration of the treatment liquid, remove the sludge generated by the reaction, treat the reaction waste liquid, etc., and the number of coating treatment steps is large. For example, in the case of Bonderite/Bondalube treatment (iron phosphate, zinc phosphate, and zinc stearate on the steel surface), degreasing → water washing → pickling → water mud → hot water washing → phosphate treatment → water washing → neutralization → lubrication Processing →
It requires 10 drying steps.

If the processed product is to be finished by painting, plating, etc., it is necessary to remove the above coating, and when removing the film,
A process of removing with acid or the like is required.

The above lubricants have no practical problems with their lubricating performance as lubricants for cold working, but recently, waste liquid from Bonderite and Bondalube processing has become a pollution problem, and lubricants that do not use phosphoric acid etc. are being used. The industry is looking for lubricants that don't require food.

The object of the present invention is to provide a cold processing method that does not require any coating treatment on the surface of the steel material, has good processing performance in drawing, drawing, extrusion processing, etc. by simply applying lubricating oil, and has no particular problem in terms of pollution. An object of the present invention is to provide a lubricant composition for processing.

The lubricating composition for plastic working of the present invention is particularly suitable for use in cold working with a lubricating oil such as mineral oil, synthetic oil, or a mixture thereof, and a compound having the general formula and (II) (where R and R' are Cm H2
+i +I, m is 1 to 24, M is Zn+ pb, Mo,
Na + K, Cu, Fe.

se+'l'e, Ni. ) X in c formula 1. It is characterized by containing at least one kind of sulfur-based compound represented by halogen, mercaptan, sulfide, nitrogen-containing group, amino group, morpholine group, carpholine group, and 2) IJ group.

As the carbamate represented by the general formula (1), the formula (
1) R, R' in methyl group, ethyl group, n-propyl group, n-butyl group, n-octyl group, n-dodecyl group, lauryl group, stearyl group, impropine group, isobutyl group, 2 -Some have an alkyl group such as ethylhexyl group. Practical examples include methyl, ethyl, n-butyl, n-octyl, and lauryl groups.

Examples of the benzothiazole compound represented by the general formula [Y] include 2-mercaptobenzothiazole, dibenzothiazyl sulfide, metal salts of 2-mercaptobenzothiazole (zn, C1, Ni, Na, etc.), 2-(2' , 4
'-Digotrophenylthio)benzothiazole, 7-chlorohexylamine salt of 2-mercaptobenzothiazole,
2-(N,N-diethylthiocarbamoylthio)benzothiazole, 2-(4'-morpholinodithiotondithiazole, N,N'dithiobis(morpholine)benzothiazole, 4,4'-dithio(dimorpholine)pentthiazole, Examples include N-fuclohexyl-2-benzothiazolylsulfenamide, N-oxydiethylene-2-penzothiazolylsulfenamide, N,N-synchrohexyl-2-penzthiazolylsulfenamide, and the like.

A lubricant composition in which sulfur compounds of general formulas (I) and (Ill) are blended with mineral oil, synthetic oil, or a mixed oil thereof is highly effective in preventing direct contact between the mold and the steel material during plastic working. This is because the added sulfur compound reacts with the surface of the steel material due to the frictional heat that accompanies plastic deformation, forming a dense and strong iron sulfide film, which improves the seizure resistance of the steel material due to insufficient lubrication and improves mold resistance. The service life can be significantly extended.The amount of sulfur compounds added to mineral oil, synthetic oil, and mixed oil is 0.1 to 30% by weight.
, preferably 0.5 to 20% by weight. Blend amount is 0
．． If the amount is less than 1% by weight, the effect of addition will be reduced. Also, 30
If the weight percentage is exceeded, the effect of adding the additive will not be improved.

In addition to the above-mentioned components, the lubricant composition of the present invention may optionally contain antioxidants, rust preventives, anticorrosive agents, etc. that improve the thermal stability of the lubricant, the rust prevention, corrosion resistance, etc. of steel materials. may be added.

The lubricant composition of the present invention not only can significantly improve machining performance compared to conventional machining oils, but also eliminates the need for chemical treatment steps.

Next, the present invention will be specifically explained with reference to Examples and Comparative Examples - Example 1 Zinc dimethyldithiocarbamate, zinc diethyldithiocarbamate, di-n-propyldithiocarbon ,;Zinc mate;
dibutyldithiocarno<zinc mate, zinc di-n-octyldithiocarbamate, zinc di-n-dodecyldithiocarbamate, zinc dilauryldithiocarbamate
The diameter of the lubricating oil containing 0% by weight is φ9,9 as shown in Figure 1.
After coating the material (SCM21), the extrusion load and processing performance were evaluated using the square, forward extrusion method using the mold shown in FIG. The evaluation results are shown in Table 1.

The processing oils of Comparative Examples 1 and 2 were conventionally used as plastic processing oils, and their compositions are shown below.

Processing oil composition of Comparative Example 1 Mineral oil + ester oil 38.5% Table 1 Pace oil: Mineral oil Table 2 Base oil: Poly-α-olefin oil Fatty oil content...43.5chi Sulfur content...5.8chi Chlorine content: 12.2% Comparative example 2 Mineral oil ・・・・・・39.7 Section Fatty oil content...50chi Sulfur content...10.3 The above-mentioned test methods are as follows.

(1) Lubricity test using 37 ton hydraulic pressure on the materials shown in Figure 1 (steel materials:
When SCM21) was processed by the forward extrusion method using the mold shown in FIG. 2, the processing load during extrusion was measured. Note that the extrusion load was measured with an automatic balance recorder via a pressure converter installed in the operating oil circuit. The test conditions were: descending speed of the punch: 15 mm/S, cross-sectional reduction rate: 64 mm (when diameter φ10 was reduced to φ6), material shape: diameter φ9.
9x30fi cylinder, mold temperature; room temperature (25-27°C
). The lower the extrusion load, the better the lubricity of the test oil.

(2) Machining performance test Under the same test conditions as the above-mentioned test conditions for lubricity evaluation using extrusion load, a band heater for heating the mold was attached to the mold shown in Figure 2, and the mold temperature was gradually increased. After applying the sample oil to the material shown in FIG. 1, 10 pieces were subjected to p-processing at each temperature, and the mold temperature at which seizure occurred on the surface of the processed material was measured. The higher the temperature, the better the processing performance of the sample oil.

As is clear from Table 1, the test oil containing 10% by weight of additives in mineral oil was found to have superior lubricity and processing performance compared to the comparative test oil. .

Leprosy Example 2 A sample oil having a viscosity at 40°C of j9 Q cst poly-α-olefin oil mixed with 10% by weight of the same additive as in Example (1) was tested in the same manner as in Example 1.

The results obtained are shown in Table 2. As is clear from Table 2, the test oils containing the additives shown in Table 2 exhibited superior lubricity and processing performance compared to the comparative examples.

Example 3 Polyalkylene having a viscosity of 22Q cst at 40° C. Table 3 Base oil: , I-”IJ alkylene glycol oil Glycol oil containing 10% of the metal salt of dibutyldithiocarbamic acid
The test oil mixed in the weight percent was subjected to forward extrusion processing under the same test conditions as in Example 1, and the lubricity and processing performance of the test oil were evaluated. The results are shown in Table 3. As is clear from Table 3, it was confirmed that the sample oil of the composition of the present invention had superior lubricity and processing performance compared to the comparative example.

Example 4 An SCM21 material was processed by the forward extrusion method under the same conditions as in Example 1 using a test oil prepared by blending 10% by weight of a benzothiazole compound with mineral oil having a viscosity of 180 cst at 40° C.K. The results are shown in Table 4.

As is clear from Table 4, it can be seen that the test oil containing the benzodeazole compound has a lower processing load, that is, exhibits better lubricity than that of the comparative example. Furthermore, since the mold temperature during machining at which seizure appears on the surface after machining is high, it can be seen that good machining performance is exhibited.

Example 5 A test oil prepared by blending 10 weight percentages of a benzothiazole compound into a poly-α-olefin oil having a viscosity of 190 cst at 40°C was tested for lubricity and processing under the same test conditions as in Example 1. Performance was evaluated. The results are shown in Table 5.

As is clear from Table 5, the test oil containing the benzothiazole compound has superior lubricity and processing performance compared to the comparative example.

Example 5 Poly-α with viscosity l 9 Q cst at 40oC
- A product prepared by blending zinc dibutyldithiocarbamate, zinc dilauryldithiocarbamate, and zinc salts of 2-(4'-morpholinodithio)benzothiazole and 2-mercaptobenzothiazole in an olefin oil in a range of 0.05 to 40% by weight. The processing performance was evaluated when the sample oil was processed by the forward extrusion processing method under the same test conditions as in Example 1. The results are shown in Table 5.

As is clear from Table 5, when the amount added exceeds 0.1% by weight, the effect of adding the additive appears and processing performance improves, but when the amount exceeds 30% by weight, the effect of addition does not improve much. .

According to the invention, the general formula R+ R'''Cm H2a++1 m=1-24
M=Zn, Pb, Mo, + Na, Cu, Fe+8
A dithiocarbamate compound consisting of e+ T e+ N' %, in which x is a benzothiazole consisting of a halogen, mercaptan, sulfite, nitrogen-containing group, amine group, morpholine group, carboxyl group, or nitrile group. Cold working lubricating oil compositions containing compounds are industrially useful because they exhibit higher lubricity and processing performance than conventional processing oils, and can help improve mold life and workability. be.

[Brief explanation of drawings]

FIG. 1 is a side view of the material used to evaluate the performance of processing oil. FIG. 2 is a longitudinal cross-sectional view of a mold used for evaluating the performance of processing oil.

Claims (1)

[Claims] 1. (a) Lubricating oil and (+)) general formula (D group, M is Zf
l, Nal Pb, MO, CLI, Fe. se, Tc or N1. ] and the general formula (ll''1 [Formula (in ID, X is]] - a rogen atom, a mercaptan, a sulfide, a nitrogen-containing group, an amine group, a morpholine group, a carboquine group, and a nitrile group). ] A lubricant composition for plastic working, characterized in that it contains at least one sulfur compound selected from the benzothiazole compounds shown below.