JPH02132190A - Lubricating oil - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Icheon field of industry 12] This invention is applicable to rolling, cutting, and grinding of steel plates, etc.
It relates to lubricating oil applicable to press working, drawing work, etc.

[Conventional technology] Conventionally, rolling lubricants have been oil-based rolling oils (beef tallow, lard, palm oil, rapeseed oil, etc.), mineral oil-based rolling oils (spindle oil, machine oil, etc.), or a mixture of these oils and fats with mineral oil. Rolling oil is widely used. Furthermore, in response to the recent demands for higher rolling speeds and higher rolling reductions, rolling oils based on synthetic ester oils (for example, fatty acid esters) have been developed. For example, Tokuko Sho 57-27156
Publication number. Special Publication No. 60-54355, “Lubrication Vol.
．． 27, NO. 8J, “Jun 7 Bones Vol. 32,
No. See 2 J.

[Problem to be solved by the invention] Recently, the inventors have obtained the following knowledge regarding the rolling of steel plates.

For electric RII1 steel sheets, the temperature of the rolling entry plate was raised to 300 to 500°C because the embrittlement of the material increases with the increase in Si content (2 to 4'L,) and to improve the electromagnetic properties. (Patent application 1986-40)
643). In addition, in order to improve the rollability and material properties of stainless steel, the temperature of the rolling side plate is set at 100~100~
It is preferable to roll at a temperature of 450°C.
-33896).

In rolling in such a temperature range, the conventional rolling lubricating oil has poor rolling properties (large rolling load) and also causes seizure (heat scratches) between the work roll and the rolled material.

Therefore, the present invention aims to provide a lubricating oil that has both lubricity and anti-seizure properties.

[Means for Solving the Problems] The il'JI lubricating oil of the present invention uses the synthetic ester base oil of the present invention, and solid ? 1'8 lubricant is added.

In recent years, synthetic esters have been used as base oils for rolling lubricating oils. However, synthetic esters for conventional rolling applications are often selected from existing synthetic esters used as engine oils, hydraulic fluids, or other d^1 lubricants, and have high lubricity and seizure resistance. It is not something that can be fully satisfied.

The synthetic ester of this invention has high lubricity and anti-seizure properties as a lubricant, and therefore has the following molecular design.

The synthetic ester of the present invention is an ester of a nitrogen-containing polyol represented by general formula (1) and a fatty acid having 6 or more carbon atoms represented by general formula (2).

General formula X? [11■CIlυ). )1...(+) However, x: 11 and 6i Glb n: Integer general formula of lzlO n-coon...(2) However, 1{: Alkyl having 5 or more carbon atoms. alkenylhydroxyalkyl and hydroxyalkenyl groups.

The esterification reaction between the nitrogen-containing polyol of general formula (1) and the fatty acid of general formula (2) can be synthesized by a conventional method without a catalyst or in the presence of a catalyst, and the synthesis method is not particularly limited.

The molar ratio of the nitrogen-containing polyol to the fatty acid of the general formula (1) is not particularly limited.
It is preferably an esterification product with an average of 1.5 mol or more of a fatty acid per 1 mol of the nitrogen-containing polyol in 1).

The fatty acid is a natural or synthetic fatty acid having 6 or more carbon atoms, and may be linear or side-chained, and may be saturated or unsaturated. For example, hexanoic acid, octanoic acid, decanoic acid, lauric acid, myristic acid, palmitic acid. Stearic acid, arachidic acid, behenic acid, montanic acid, balmitic oleic acid, oleic acid, erucic acid, ricinoleic acid, hyaloxydearic acid, linoleic acid, linolenic acid, isooctylic acid, isodecanoic acid, isolauric acid, isomyristic acid , isopalmitic acid, isostearic acid, isoaracic acid, etc. can be used.

The reason why the fatty acids are limited to fatty acids having 6 or more carbon atoms is that esterification products with fatty acids having less than 6 carbon atoms have only a low lubricity and anti-seizure property. On the other hand, the upper limit of the number of carbon atoms in fatty acids is preferably not regulated, or is generally 30 carbon atoms or less as it is within the range that can be produced manually at low cost.

The nitrogen-containing polyol represented by the general formula (1) is obtained by subjecting isocyanuric acid to an addition reaction of 1 molar number of ethylene oxide, which is X-11, or propylene oxide, which is It is. The reason for using ethylene oxide or brobylene oxide adducts is that higher alkylene oxide adducts, such as butylene oxide adducts, are industrially expensive and difficult to handle, making them unsuitable as lubricants. It is.

Further, the number n of moles of ethylene oxide or propylene oxide added in the nitrogen-containing polyol of general formula (1) is preferably an integer of 1 to 1O. When n is greater than or equal to 1, the molecular size becomes large and the number of ether bonds increases, and the sliding properties and anti-seizure properties decrease.

However, the number of n shown here is the average number of moles, and as the number of n increases, a distribution occurs in the number of moles of ethylene oxide or propylene oxide added. 12 may not be included.

In the nitrogen-containing polyolefin which can be used in the present invention, n is just the average number of moles, and the average number of moles is preferably IO or less. Among the nitrogen-containing molecules of general formula (1), tris(2-hydroxyethyl) of n.I, X-11 is particularly
Isocyanurate is advantageous as an iI4 lubricating oil because it is industrially easy to use and is inexpensive. Examples of the properties of the obtained synthetic esters are shown in Table 1.

Mica, graphite, potassium titanate (k20
・nTi02- x, x: Hydrate...For example, k20.6TI02 Te4 SumoD, k20.6T1
02”l/21120 7-4 Smo, Otsuka Chemical (
Co., Ltd. product name), potassium phosphate (κ3PO4, KP
Ultrafine amounts of inorganic compounds such as (13), MCAC) lamin cyanurate (trade name manufactured by Mitsubishi Yuka Co., Ltd.), and compounds such as N@-lauroyl lysine (manufactured by Ajinomoto Co., Inc., trade name Amiphobe LL). Powder (for example, 0.1 to 50 um) is used. A plurality of these solid materials may be mixed and added.

The amount of these solid lubricants added is 0.1 to 30 fiNt.
%i. If the addition amount is less than 0.1 t, no improvement in lubricating properties will be observed, and if it exceeds 30 t, the lubricity direction F will be saturated and the solid lubricant will be useless.

Potassium ruthophosphate (K3) is used as part of the solid lubricant.
P04) Matahametaphosphoric acid h')um (KPO3
) is intended to have a lubricating effect as well as a heat insulating effect on the rolling rolls by dissolving them.If the potassium phosphate content is less than 0.1%, no heat insulating effect will be seen, and if it exceeds In. and the heat insulation effect is saturated,
Furthermore, if it exceeds 20%, the lubricity decreases.

The ill lubricating oil of the present invention can be used by adding a solid lubricant to the synthetic esdel as a binder, or by mixing these with mineral oil, animal or vegetable oil, and adding an emulsifier to form an emulsion. It can also be used as

In addition, it can also be used in combination with emulsifiers, fatty acids, antioxidants, and corrosion inhibitors that are commonly used as additives in practical rolling oils.

When using the synthetic ester of the present invention mixed with other base oils, etc., 10 nails! It is desirable that the content be 11* or more. Also, the amount of solid lubricant added is 0.1-:10wtx1%
It is. In the case of potassium phosphate (K, PO4, κpo3), the range is preferably from 0.1 to 201rLJa*.

An example of the method for synthesizing esdel of the present invention will be shown below.

Synthesis example 4 equipped with a stirrer, thermometer, nitrogen gas blowing pipe, and water separator
[1 flask was charged with 1.522 g (2 mol) of tris (2- and droxyethyl) isocyanurate and 1269 g (5.85 mol) of coconut oil fatty acid, and the custom-made amount was added in the absence of a catalyst using xylene as a refluxing solvent. The mixture was stirred well and reacted at 160 to 230°C until the calculated amount of water was distilled out. The required time was 9 hours. Reaction end 7'? &, Distill xylene under reduced pressure? A yellow liquid was obtained by decolorizing and filtering using activated clay. Accommodationffl1
661g. The acid value was 1.8. Below, synthetic esters were produced using the company's method. The properties of the obtained synthetic esdel are shown in Table 1.

Table 1 [Function] The synthetic esdel of the nitrogen-containing polyol represented by the general formula (1) and the fatty acid having carbon a6 or more improves the seizure resistance. Synthetic ester and conventional rolling? Table 2 shows the results of the Bowden test comparing the anti-seize properties of Iv1 lubricating oil and Iv1 lubricating oil. The test piece was an SPCC bright plate, the amount of oil applied was 1g/m2, and the load was 3κg.

Table 2 1) Emery E+oersol 871
2) Hydrogenated fish oil fatty acid 3》 Methyl content JjJIn fatty acid-containing mixed fatty acid (SV 173, IV 70) Ne: (No. 1) κP03 (B) K3P041): K20・6'
ri02 Hayashi: Symbols of synthetic esters are the same as those in Table 1.
A solid lubricant added to the ↓ζ oil made of the synthetic ester shown in the table improves the lubricity.

FIG. 1 shows test results comparing the rolling properties of the rolling lubricating oil of the present invention containing a solid lubricant and a conventional rolling oil. In the figure, P represents the elongation f; η weight, and Δh represents the compression amount. The test material was SPIIC material (0.8t
x 20w x 300J2 mm), the roll diameter is 150m+n, and the rolling reduction is 30!1i.

Among the solid lubricants, potassium phosphate improves rolling properties and has a heat insulating effect. Figure 2 shows κ3P
It shows the low F roll surface temperature when 04 was added. The insulation effect prevents abnormal thermal crowns that occur on the work rolls during rolling.

[Example] A comparative test was conducted on the rolling lubricating oil of the present invention and a conventional rolling lubricating oil under the following rolling conditions.

Rolling JXi: 4 Old rolling mill Work roll diameter: 165a
+m rolling material: S old 30, l. 2Lx IHwX
: 7 Ilmrn Rolling entry temperature: 350°C Rolling reduction: Approximately 35 yen J Rolling speed: 70 m/min Entrance tension: 5 kHz. mm2 Output side tension: 15 kg/+n+n2 As a result of the above test, the rolling lubricating oil of the present invention to which a solid lubricant was added had good rolling properties and beat scratch resistance. On the other hand, conventional rolling lubricating oils caused frequent heat scratches.

In the above explanation, warm rolling was mainly explained as an example, but the lubricating oil of the present invention can also be used for other processing such as cold rolling, hot rolling, cutting, grinding, pressing, and drawing. Can be done.

[Effects of the Invention] The lubricating oil of the present invention has excellent lubricity and seizure resistance, and can improve productivity and quality yield in rolling and other processing. In particular, during warm rolling, heat scratches do not occur and rolling can be carried out stably, and although it is highly effective during warm rolling, it can also be used as a lubricant for cold rolling and hot rolling. .

[Brief explanation of drawings]

Fig. 1 is a graph showing the test results comparing the rolling properties of the rolling lubricating oil of the present invention and the conventional rolling lubricating oil, each containing a solid lubricant (MCA), and Fig. 2 is a graph showing the test results for the rolling lubricating oil of the present invention containing a solid lubricant (MCA). It is a graph showing the low temperature of the roll surface when K and PO4 are added.

Claims (1)

[Claims] 1. General formula (I) ▲There are mathematical formulas, chemical formulas, tables, etc.▼... (I) However, a nitrogen-containing polyol represented by X: H or CH_3 n: an integer from 1 to 10 Lubricating oil (a) containing an ester product with a fatty acid having 6 or more carbon atoms, general formula (
The lubricating oil (b) in which I) is tris-(2-hydroxyethyl) isocyanurate, or the esterification product contains an average of 1. A lubricating oil characterized in that it contains the lubricating oil (b) that has been esterified in a proportion of 5 moles or more, and also contains a solid lubricant. 2. The solid lubricant includes inorganic natural mica, synthetic mica, graphite, potassium titanate, etc. and/or organic solid lubricant having a melting point (decomposition) such as melamine cyanurate and N^ε-lauroyl lysine. 0.1~3
The lubricating oil according to claim 1, characterized in that it contains 0%. 3. As the solid lubricant, potassium orthophosphate (K
_3PO_4) and/or potassium metaphosphate (K
The lubricating oil according to claim 1, characterized in that it contains 0.1 to 20% of PO_3).