JPH04114096A - Lubricant oil composition for stainless steel processing and using method thereof - Google Patents

Abstract

PURPOSE:To obtain the subject composition readily formable into a film having excellent lubricating properties comprising oxalic acid, (poly)alkylene oxide compound and base oil. CONSTITUTION:The aimed composition comprises (A) oxalic acid, (B) a (poly) alkylene oxide compound composed of an ether compound (or phosphate of said compound) of (poly)alkylene glycol and alcohol, a fatty ester compound of (poly)alkylene glycol or a compound of (poly)alkylene glycol and alkylamine, etc., and (C) base oil such as mineral oil or synthetic oil.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention applies drawing processing, header processing,
The present invention relates to a lubricating oil composition for stainless steel processing that forms a film on stainless steel to provide lubricity when performing plastic working such as cold forging, and a method for using the same.

<Conventional technology> Generally, when performing cold working, etc., the surface of the workpiece is lubricated to prevent direct contact between the workpiece and the tool and to prevent seizure. . That is, in the case of carbon steel or low alloy steel, a phosphate film is formed on the surface by phosphate treatment, and then treated with soap or solid lubricant.

However, in the case of stainless steel, the above lubrication treatment could not be applied because a phosphate film could not be formed.

Therefore, in place of the above-mentioned phosphate film, many methods have been adopted in which an oxalate film is formed and then treated with lubrication.
Publication No. 61-199514 describes that mineral oil treatment is performed after forming an oxalate film, and JP-A No. 64-78
Publication No. 641 describes that after forming an oxalate film, a copper film is formed by copper plating. moreover,
JP-A-58-179295 describes that after forming an oxalate film, it is treated with a lubricant containing waxes, mineral oil, and aliphatic amine.

<Problems to be Solved by the Invention> However, since oxalic acid is water-soluble, these methods first form a base film (oxalate film) on the surface of stainless steel in an oxalic acid aqueous solution, and then This method requires two steps, including treatment with a lubricant, and has the problem of poor workability.

An object of the present invention is to provide a lubricating oil composition for stainless steel processing that can easily lubricate stainless steel in one step, and a method for using the same.

<Means and effects for solving the problems> As a result of extensive research to solve the above problems, the present inventors have discovered that oxalic acid, at least one selected from alkylene oxide compounds and polyalkylene oxide compounds. The inventors have now discovered the new fact that a lubricating oil composition for stainless steel processing containing a base oil and a base oil can solve the above problems, and have completed the present invention.

That is, in the present invention, oxalic acid is dissolved in a base oil using an alkylene oxide compound or a polyalkylene oxide compound c (hereinafter, these compounds are collectively referred to as a (poly)alkylene oxide compound), and is applied to the surface of stainless steel in this base oil. In addition to forming an oxalate film, it is also possible to perform lubrication treatment using base oil at the same time.

Further, in the present invention, in order to obtain a good lubricating film, it is preferable to add water to the above composition.

In order to form a good oxalate film, the blending ratio of oxalic acid in the present invention is 0.5 to 6% relative to the total amount of the composition.
The content may be 0% (weight %, the same applies hereinafter), but it is more preferably 0.5 to 25% in order to provide the composition with easy-to-handle fluidity. When the blending ratio of oxalic acid is less than 0.5%, the formation of an oxalate film is insufficient and high lubricating performance cannot be achieved.On the other hand, when it exceeds 60%, the temperature at which the film is formed (30-100 ℃), the composition becomes greasy, which is undesirable.

Oxalic acid in the present invention is oxalic acid (anhydride) CyH*
In addition to 04, the concept also includes oxalic acid containing water of crystallization.

The (poly)alkylene oxide compound in the present invention has a function of dissolving water-soluble oxalic acid in base oil. Such (poly)alkylene glycols include ether compounds of (poly)alkylene glycol and alcohol, fatty acid ester compounds of (poly)alkylene glycol, compounds of (poly)alkylene glycol and alkylamines, or compounds of (poly)alkylene glycol and alcohol. Examples include phosphoric acid esters of ether compounds obtained from
A mixture of two or more species can be used.

As an ether compound of (poly)alkylene glycol and alcohol, for example, the general formula (1): % formula % (1) (wherein R1 is an alkyl group having 4 or more carbon atoms, an alkenyl group having 4 or more carbon atoms) , an aryl group or an aralkyl group which may have an alkyl group as a substituent, and the aryl group in the aralkyl group may have an alkyl group as a substituent.

R2 is an alkylene group having 2 to 4 carbon atoms, and n is an integer of 1 or more. ) can be given.

As a fatty acid ester compound of (poly)alkylene glycol, for example, general formula (2):% formula % (2) (wherein R2 and n are the same as above, R3 has 3 carbon atoms
These are the above alkyl groups. ) can be given.

Examples of compounds of (poly)alkylene glycol and alkylamine include general formula (3): (wherein R', R
” and n are the same as above, X and Z are 1 or 2, y
is 0 or l, and there is a relationship of X+y+z=3. )
can be given.

As a phosphoric acid ester of an ether compound obtained by reacting a (poly)alkylene glycol and an alcohol, for example, the general formula (4): (wherein R1, R2 and n are the same as above, l is 1 to 3) An integer, m is an integer from 0 to 2, and there is a relationship of 1+m=3.).

In the general formulas (1) to (4), n is preferably 1 or more, particularly preferably 4 to 18. Further, the number of carbon atoms in the alkyl group and alkenyl group is preferably 4 or more, particularly preferably 4 to 18.

To explain more specifically, examples of the ether compound represented by the general formula (1) include, for example, when n=1, butoxycetanol, hexyloxyethanol, octyloxyethanol, 2-ethylhexyloxyethanol, lauryloxy Ethanol, tridecyloxyethanol, oleyloxyethanol, phenoloxyethanol, octyloxyethanol, nonylphenoloxyethanol, butoxypropanol, hexyloxypropanol, octyloxypropanol, 2-ethylhexyloxypropanol, lauryloxypropanol, tridecyl Examples include oxypropanol, oleyloxypropanol, phenoxypropanol, octylphenokidibrobanol, nonylphenoxypropanol, and when n≧2, polyoxyethylene butyl ether, polyoxyethylene hexyl ether, polyoxyethylene octyl ether, Oxyethylene-2-ethylhexyl ether, polyoxyethylene lauryl ether, polyoxyethylene tridecyl ether, polyoxyethylene oleyl ether,
Examples include polyoxyethylene phenol ether, polyoxyethylene octyl phenol ether, polyoxyethylene nonyl phenol ether, polyoxypropylene butyl ether, polyoxypropylene hexyl ether, polyoxypropylene-2-ethylhexyl ether, polyoxypropylene lauryl ether, and the like.

Examples of the ester compound represented by the general formula (2) include ethylene glycol octylate, ethylene glycol-2-ethylhexylate, ethylene glycol laurate, and ethylene glycol nonyl ferrate when n=1. and when n≧2, polyoxyethylene octylate, polyoxyethylene-
Examples include 2-ethylhexylate, polyoxyethylene laurate, and polyoxyethylene nonylbenzoate.

As a compound of a (poly)alkylene glycol and an alkylamine represented by the general formula (3), the following general formula (
3-a), (3-b) and (3-C).

(R'+TN-+R" O+78 (3-a)R
1-N-(-R"O+-v-H(3-b)R' NOR
"O+7-H]t (3-c) (In each formula, R1, R
1 and n are the same as above. ) Specific examples of compounds of (poly)alkylene glycol and alkylamine represented by general formula (3-a) include n
:=1, examples include N,N-dioctyl-2-hydroxyethylamine, N,N-di(2ethylhexyl)-2-hydroxyethylamine, N,N-dilauryl-2-hydroxyethylamine, and n≧2. When , N
, N-dihexylpolyoxyethyleneamine, N,N
-dioctyl-polyoxyethyleneamine, N,N-ditridecyl-polyoxyethyleneamine, N.

Examples include N-dioctyl-polyoxyethylene phenylamine.

Specific examples of the compound of (poly)alkylene glycol and alkylamine represented by general formula (3-b) include n
= 1, examples include N-cutyl-2-hydroxyethylamine, N-(2-ethylhexyl)-2-hydroxyethylamine, N-lauryl-2-hydroxyethylamine, and when n≧2, N- Examples include xyl-polyoxyethyleneamine, N-octyl-polyoxyethyleneamine, N-tridecyl-polyoxyethyleneamine, and N-dioctylphenyl-polyoxyethyleneamine.

Specific examples of the compound of (poly)alkylene glycol and alkylamine represented by general formula (3-c) include n
When n=1, examples include N,N-bisethylene glycol-butylamine, N,N-bisethylene glycol-2-ethylhexylamine, and when n≧2, N,N
Examples include -bispolyoxyethylene-butylamine and N,N-bispolyoxyethylene-2-ethylhexylamine.

As the phosphoric acid ester represented by the general formula (4), for example, when f=3, tris(tridecyloxyethyl) phosphate, tris(2-ethylhexyl-polyoxyethylene) phosphate; when A=2 , di(2-ethylhexyloxyethyl) phosphate, di(2-ethylhexyl-polyoxyethylene) phosphate, di(
2-ethylhexyl-polyoxypropylene) phosphate, di(lauryl-polyoxyethylene) phosphate, when J=1, (tridecyloxyethyl) phosphate, (polyoxyethylene-2-ethylhexyl)
Examples include phosphate.

The blending ratio of the (poly)alkylene glycol compound is 6 to 65%, preferably 20 to 55%, based on the total amount of the composition.
It is. Contains 6% (poly)alkylene glycol
When the amount is less, it is difficult to uniformly dissolve oxalic acid in the base oil, while when it exceeds 65%, the fluidity of the composition changes when water is added, which is not preferable.

The base oil in the present invention can be any oil used as a lubricant, such as mineral oil (machine oil, etc.), synthetic oil, or a mixture thereof. Here, examples of the mineral oil include those having a kinematic viscosity of 8 cSt or more at 40°C.

The blending ratio of base oil is 20 to 90% of the total amount of the composition.
, preferably 25 to 78%. When the blending ratio of base oil is less than 20%, a sufficient lubricating effect cannot be obtained, while when it exceeds 90%, the solubility of oxalic acid becomes low, which is not preferable.

Note that the blending ratio of the base oil and (poly)alkylene glycol compound to be used varies as appropriate depending on the types thereof.

Although the composition of the present invention can form a desired film even in the absence of water, when water is present in the composition,
Forms an even better film and provides high lubrication performance. The amount of water blended is preferably about 0.5 to 30%; if the amount of water blended exceeds 30%, the liquid composition may separate into two layers, which is not preferable.

Other additives may also be used to strengthen the coating on the stainless steel surface. Such additives include
Examples include water-soluble polymers (such as polyvinyl alcohol); stearic acid, metal stearate, oleic acid, metal salts of oleate: hydroxylammonium sulfate, and sodium thiosulfate (so-called hypo).

The composition of the present invention is prepared by mixing the above-mentioned components and
It can be manufactured by heating and dissolving it at a temperature of about 0°C.

When lubricating stainless steel using the obtained composition, stainless steel is added to the composition at a concentration of 30 to +0
Soak at a temperature of 0°C. This allows a lubricating film to be evenly and uniformly formed on the surface of the stainless steel.

Here, if the dipping temperature is lower than 30°C, a film of sufficient thickness cannot be obtained. On the other hand, when the immersion temperature exceeds 100°C, it is economically disadvantageous. In addition, it is preferable for the immersion time to be 60 minutes or less in terms of workability and economy.

Stainless steel that has been lubricated in this way exhibits excellent lubrication effects such as reducing tool friction and preventing seizure during plastic processing such as tube and wire drawing, header processing, and cold forging.

Stainless steels to which the present invention can be applied include normal stainless steels, regardless of whether they are martensitic, ferritic, or onystenitic.

Highly corrosion-resistant stainless steels each containing 20% or more of Cr can be used. Furthermore, it is also applicable to high alloy steels such as Duplex steel and high Ni alloy steel.

<Example> Next, the lubricating oil composition of the present invention and its method of use will be explained in detail by giving examples.

Example 1 As a (poly)alkylene glycol compound, predetermined amounts of each of the three types of polyoxyethylene lauryl ether shown below and 3.6 g of oxalic acid (anhydrous) were charged into a four-eye flask equipped with a thermometer and a cooling tube. The mixture was stirred at 70° C. for 30 minutes to dissolve the oxalic acid.

(arc +tHtsO(Ct HaO) s H6
,6g(blc+tH□O(CaH40) 7 Hl
1.4 g (clc+tH*5o(CtH40)*H
After adding 9.0 g of water to 11.4 g of water, the kinematic viscosity at 40°C is 8.7 c S as a base oil.
Mineral oil (machine oil #10 manufactured by Shell Oil ■) 18
．． 0 g was added and stirred at 60° C. for 30 minutes to obtain 60.0 g of a uniform transparent liquid lubricating oil composition.

Examples 2 to 9 Example 1 except that each component was used in the proportions shown in Table 1.
A lubricating oil composition was obtained in the same manner as above.

Comparative Example 1 A composition was prepared using only oxalic acid and water without using a (poly)alkylene oxide compound or base oil. The blending ratios are shown in Table 1.

Comparative Example 2 Example 1 except that each component was used in the proportions shown in Table 1
A lubricating oil composition was obtained in the same manner as above.

Examples 1O to 12 As (poly)alkylene glycols, appropriate combinations of the compounds shown below and the above (al, (b) and (C) compounds) were used.
Shown in the table.

(d) C+5Hss OCI H40H(e)
C+5Hss OCI H40H(f)
C, H,, O(C2H, O)7 H(g) C*
H+□O(CH,-CHO)7HCH.

Tables 1 and 2 also show the appearance of the compositions obtained in each Example and Comparative Example, the state of the film obtained using the same, and the amount of film.

Here, the appearance of the composition is an evaluation of the color, transparency, fluidity, and liquid uniformity of the composition in a state heated to 60°C.

Using each of the obtained compositions, stainless steel 5US304
(Dimensions 5.Ocm x 2.Ocm x 0.3
A lubricating film was formed on the surface of a test piece with a surface area of 0 cm and a surface area of 24.2 cnf.

The surface of the test piece was previously polished with #600 sandpaper and then degreased with petroleum benzene.

Formation of the film and measurement of the amount of film were performed as follows.

That is, 60.0 g of the composition was placed in a beaker, and the test piece was immersed therein, placed in a constant temperature bath at 60°C, and 30 minutes after the liquid temperature reached 60°C, the test piece was taken out. Then, the deposits on the surface of the test piece were removed using petroleum benzine, and the test piece was air-dried. After air drying, the test piece was weighed and the amount of film was measured.

In addition, the state of the film was visually evaluated based on the following criteria.

○: A good film is formed. △: A film is formed, but the film thickness is thin ×: It is almost impossible to confirm whether it is a film or not. (Margin below) Table 1 (continued) (Unit double amount% of compounding amount) Table 1 (Unit of blended amount: weight%) The composition of Example 4 was greasy.

Table 2 (Unit of blended amount: % by weight) As is clear from Tables 1 and 2, all of the other Examples except Example 6 were prepared using the conventional method using only oxalic acid and water (
Compared to Comparative Example 1), a film that was almost the same or even better was obtained. The reason why the film of Example 6 is inferior to other Examples and Comparative Examples is thought to be because the composition does not contain water, but depending on the conditions of plastic working of stainless steel, etc. However, it is fully usable.

In addition, the film obtained in Comparative Example 1 needs to be immersed in base oil or the like for lubrication treatment, whereas the film obtained in each Example is almost as good as that of Comparative Example 1. , or smaller than that.

From this, it can be seen that the films formed by immersing stainless steel in the compositions of each example exhibit excellent lubrication performance.

On the other hand, in Comparative Example 2, since the amount of film was small, the state of the film was also poor.

<Effects of the Invention> Since the lubricating oil composition of the present invention contains oxalic acid, a (poly)alkylene oxide compound, and a base oil, it forms an oxalate film on the surface of stainless steel and at the same time Since lubrication treatment can be performed using base oil, the two steps of oxalate film formation and lubrication treatment can be reduced to one step, and workability is also improved, reducing the cost required for processing stainless steel. This can be reduced.

Further, according to the method of using the lubricating oil composition of the present invention, there is an effect that a film having excellent lubricating performance can be easily formed.

Patent applicant: Sakai Chemical Industry Co., Ltd.

Claims (1)

[Scope of Claims] 1. A lubricating oil composition for stainless steel processing containing oxalic acid, at least one selected from alkylene oxide compounds and polyalkylene oxide compounds, and base oil. 2. The lubricating oil composition for stainless steel processing according to claim 1, which contains water. 3. The alkylene oxide compound or polyalkylene oxide compound is (1) an ether compound of alkylene glycol or polyalkylene glycol and alcohol; (2) a fatty acid ester compound of alkylene glycol or polyalkylene glycol; (3) alkylene glycol or polyalkylene glycol; The lubricating oil composition for stainless steel processing according to claim 1, which is a compound of an alkylene glycol and an alkylamine; or (4) a phosphate ester of an ether compound obtained by reacting an alkylene glycol or a polyalkylene glycol with an alcohol. 4. The composition according to claim 1 contains stainless steel in an amount of 30 to 30%.
A method of using a lubricating oil composition for processing stainless steel, which comprises forming a lubricating film on the surface of stainless steel by immersing it at a temperature of 100°C.