JPS62209199A - Lubricant composition for hot rolling of steel - Google Patents

Abstract

PURPOSE:A lubricant composition for lubricating contact parts between rolls and materials to be rolled well in hot rolling of steel, obtained by dispersing specific compounded calcium soap and a specific diurea group-containing organic compound into a base oil uniformly. CONSTITUTION:A base oil is blended with (A) preferably 2-12wt% compounded calcium soap consisting of a straight-chain fatty acid, an aromatic carboxylic acid, boric acid and calcium alkenyl-succinate and (B) preferably 1-20wt% diurea group-containing organic compound consisting of a monoamine and an aromatic diisocyanate are uniformly dispersed into a base oil to give the aimed lubricant composition. The weight ratio of the component A and B is preferably about 2-3:1-2. EFFECT:Having improved heat resistance and adhesion efficiency.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention provides an improved method that satisfactorily lubricates the contact area between the roll and the rolled material and has excellent heat resistance and adhesion efficiency during hot rolling of steel materials. The present invention relates to a lubricant composition.

[Conventional technology]

Conventionally, only roll cooling water has been used in hot rolling, but in recent years, attempts have been made to use rolling oil 1e in order to reduce the rolling load and extend the rolls outward, and this is almost becoming established.

For example, greases with excellent water resistance such as Li-complex grease, calcium and calcium complex grease, polyurea grease, and aluminum complex grease can be used as hot rolling lubricants or It is known to have especially excellent adhesion and water wash resistance compared to commercially available ordinary hot rolling oils.

[Problem that the invention seeks to solve]

However, these known grease compositions tend to decompose when the roll surface temperature becomes high (100 degrees Celsius or higher), or there are other problems such as a defective drainage plate installed just before the diffraction section for supplying the lubricant. For this reason, if a large amount of cooling water is splashed onto the roll surface, it is washed away by the water and the effectiveness of the oil agent is halved.

It may be possible to increase the amount of additive used in order to maintain its effectiveness, and although this measure may slightly improve the adhesion efficiency of the additive, it also increases the viscosity of the oil and makes it difficult to spread it uniformly onto the lubricated surface. The disadvantage is that refueling becomes difficult.

Moreover, during normal roll rolling operations, the temperature of the roll surface reaches 500 to 700°C, so even under this temperature condition, the lubricity is good, and the so-called adhesion efficiency is that it is not washed away by a large amount of roll cooling water. There was a desire to develop an oil with good quality.

[Means for solving problems]

As a result of various studies conducted in response to the above-mentioned surrounding demands, the present invention proposes the use of a composition in which a base oil is uniformly dispersed with a calcium soap containing a diurea group and a compound containing a diurea group. It was developed based on the discovery that it has excellent adhesion and lubricity even in the presence of cooling water, and can be easily supplied to lubricated surfaces. Complex soap consisting of 11a fatty acids, halonic acid, and carunium alkenylsuccinate (hereinafter referred to as
They have achieved a lubricant made by uniformly dispersing a special composite aluminum soap) and an organic compound containing a diurea group (hereinafter referred to as a diurea group-containing compound) consisting of a monoamine and an aromatic diisocyanate-1-.

The lubricant composition of the present invention thus obtained has significantly enhanced adhesion efficiency and lubricity compared to conventional rolling oils.

The above novel findings were obtained through repeated experiments, but their theoretical elucidation is still insufficient.

Application of the lubricant composition according to the present invention to a lubricated part (this method consists of dispersing heated water, heated steam, heated air, etc. in a medium and supplying oil to the roll surface or lubricated part).

[Effect]

In the present invention, mineral oil, oil, synthetic 711
1 is used, but this material may be in any form of liquid, semi-solid, or solid at room temperature, and includes all materials that essentially have lubricity.

To improve adhesion and lubricity to base oils,
The addition of metal soaps to thicken the base oil or compositions or greases to provide lubrication properties is also in line with the objectives of this invention.

Specific examples of such grease include the aforementioned Li-complex grease, calcium and calcium complex grease, polyurea grease,
Any type of grease with good water resistance, such as aluminum complex grease, can be used.

In the present invention, the purpose can only be achieved by combining a special complex calcium soap selected from the above-mentioned range with a diurea group-containing compound in base oil; Even if it is lacking, the intended purpose will not be achieved.

Here, we will introduce the acid components of the special complex calcium soap used (7 and 11, straight chain fatty acids, aromatic carboxylic acids, oxalic acid,
There are four components of alkenylsuccinic acid, and it is necessary to use them simultaneously.

Among these acids, linear fatty acids are added mainly to improve lubricity.For this purpose, linear fatty acids preferably have 1 to 22 carbon atoms, and in particular, acetic acid, acetic acid, , palmitic acid, stearic acid, and 1
2-Hydroxystearic acid is also preferred.

In addition, aromatic carboxylic acids are expected to contribute to the stability of the micelle structure in the lubricant composition and are essential for maintaining the uniformity of the entire composition. It is desirable to use a carboxylic acid having a benzene nucleus, such as p-tert-butylbenzoic acid, p-tertiary-butylbenzoic acid, phthalic acid, and especially a 1 lilli carboxylic acid.

Furthermore, halonic acid maintains adhesive properties at high temperatures, and the last alkenylsuccinic acid exhibits lubricating properties and has the property of entrapping water into the oil, so it can be used at low temperatures. It is desirable to use alkenyl groups with carbon numbers in the range of 1 to 20, particularly those with carbon numbers in the range of 8 to 15. It is easier to obtain the desired results when

In this case, it is effective to use either a straight chain or a side chain as the carbon chain.

Adhesion and lubricity can be exhibited over a wide range from low to high temperatures only by uniformly dispersing the above-mentioned complex calcium soap containing four essential acid components in a base oil.

These acids and calcium constitute a calcium soap, and the molar ratio of the four essential acid components to calcium includes, in principle, any ratio.

However, especially for 1 mole of calcium, directly ff1llll
Fatty acid 0.2-0.4 mol, aromatic carboxylic acid 0°1-0
．． 4 mol, 0.1 to 0.4 mol of oxalic acid, and 0.3 to 0.6 mol of alkenylsuccinic acid.

The amount of the thus-formed Toju Slimming Calcium Soap used is 0.5 to 20% by weight, preferably about 2 to 12% by weight.

The amount of special complex calcium soap used is 0 compared to the base oil.
．． If it is less than 5% by weight, it cannot be expected to be effective as a hot rolling lubricant; on the other hand, if it is used in excess of 20% by weight, it will not be effective as a lubricant even though it may show good results in terms of performance. It becomes difficult to supply the product to the surface.

In any case, it has been observed that as the amount of special complex calcium soap added to the base oil increases, problems tend to appear in the lubricating performance of the lubricant.

In order to solve this problem, in the present invention, 1 to 20% by weight of a diurea group-containing compound is added to the oil agent obtained by uniformly dispersing the special composite calcium soap in the base oil. - To provide a lubricant composition with good lubricity without impairing adhesion and lubricity at high and low temperatures.

Compounds containing urea groups (formed from monoamines and aromatic diisocyanates).

Although it is possible to use organic compounds with urea groups such as di- or tetraurea groups, it is best to use diurea groups from the viewpoint of compatibility with special complex calcium soaps. preferable.

Even if the organic compound has a diurea group, an organic compound consisting of an aromatic diamine and an aromatic diisocyanate-1 cannot be uniformly dispersed in an oil agent consisting of a base oil and a special complex calcium soap. Even if it is
No significant improvement in oil supply to lubricated surfaces was observed.

In the present invention, the monoamine neck includes hexylamine,
These include octylamine, dodecylamine, hexadecylamine, icosylamine, dodecenylamine, aniline, toluidine, naphthylamine, benzylamine, tallow amine, and the like.

Further, as specific examples of aromatic isocyanene-1, diphenynosimethane-4,4'-diisocyane-1-, tolidine diisoleanate, naphthylene-1,5-diisonane 1-1I-lylene diisocyanate Ne-1, etc.

When using a monoamine and an aromatic diisocyanate according to the present invention, the monoamine and the aromatic diisocyanate-1.
The most desirable results are likely to be obtained if the molar ratio is 2:1.

The weight ratio of the special complex calcium soap to the diurea group-containing compound includes all ratios, but preferably a ratio of about 2 to 3:1 to 2 provides favorable results.

The lubricant composition of the present invention can be produced by adding a special complex calcium soap and a diurea group-containing compound to a base oil and kneading the mixture uniformly. Specified amounts of straight chain fatty acids, aromatic carboxylic acids, halonic acid, alkenylsuccinic acid, and slaked lime were added and saponified by heating, and separately, monoamines and aromatic diisocyanate-1 were added to some base oil and reacted. An organic compound having a diurea group is produced, and the remaining base oil and various additives are added to the two and sufficiently kneaded to obtain a uniform mixture.

In the present invention, it goes without saying that other additives such as rust preventives, antioxidants, antiwear agents, extreme pressure additives, etc. can be further included.

〔Example〕

A lubricant composition having the composition shown in the table was prepared below, and its physical properties were determined and are also shown in the table.

In addition, various physical properties, performance tests, and their evaluations were conducted in accordance with the following.

(1) Adhesion test (A) Room temperature method - KO L + 00 Spray with air and determine the amount of oil adhered to the steel plate by weight (■).

Evaluation: 050rng/100cd or more 030~50+ng
/ 100crjΔ10~30+ng / 100c
d
/min, and determine the amount of oil adhered to the steel plate in terms of weight (A mg).

Next, using a nozzle with residual KBF 0665, 3 kg/d
Water at 25°C was injected for 5 seconds from a position of 20 cmg1, and the amount of residual oil on the steel plate was determined (Bag).

1 Once OAmg/100cj is 40 or more, Bmg/]
00cj is 30 or less A mg / 100cj is 4
0 or more, B +ng / 1100c! is 20~3゜ΔAmg/100c+7 is 20~40te, B mg/
1oocf is 10~2°XAmg/100cj is 20
Below, B mg / 100ed 10 or less (3)
Hot lubrication performance test A steam-heated test piece was sandwiched between two rotating upper and lower rolls, both ends were fixed, a predetermined load was applied, and lubrication was applied while slipping, and the friction coefficient and anti-seizure performance were calculated. ,
A comprehensive evaluation of lubricity under high temperature conditions is performed using both of these.

Roll dimensions: 80 mm x 124 mm Roll material
; Brain roll test piece; 5S-41 (20aua x 2
0xF+80mm) Roll peripheral speed: 60mpm Load: 1ton Test piece temperature: 800℃ J@Gap ratio Apply a load while refueling, find the torque and applied load after 10 seconds, and calculate from the following formula.

μ=T/R-W T; Shaft torque R; Roll diameter W; Applied load/performance method ■After the test piece reaches the specified temperature, apply the specified load while refueling and continue for 10 seconds.

■After that, without refueling, continue pressurizing until the rotation l/lux suddenly increases. This point is called burn-in.

■Measure the time from when refueling is stopped until seizing occurs, and the seizing resistance is determined by the number of seconds of this time.

・Evaluation Friction coefficient N (seizing performance (seconds) Q
0.09 or less 50 or less 0
．． 09~0.11 30~50Δ 0.
11~0.13 10~30X 0
．． 13 or more 10 or less (4) Uniform oil supply test 1 - Adjust the oil pressure and air pressure so that it is 200cc/win and spray with air, and check whether the spray is evenly distributed in the form of oil droplets. Check whether

Rating: 0 Sprayed uniformly in the form of oil droplets O Uniform - Sprayed, but the adhesion state is uneven x No atomized The above results are summarized in the following table.

From this table, we can see that the base oil contains direct fatty acids and aromatic carbonyl! I
The steel of the present invention is a composition obtained by uniformly dispersing a complex calcium soap consisting of L boric acid and calcium alkenylsuccinate, a monoamine, and an organic compound having a diurea group consisting of aromatic diisocyanate-1- in the indicated ratio. The hot rolling lubricating composition was found to have excellent adhesion and lubricity from low to high temperatures, and was also found to have good supply properties to lubricated surfaces.

〔Effect of the invention〕

Claims (1)

[Claims] It is characterized by uniformly dispersing in the base oil a complex calcium soap consisting of linear fatty acids, aromatic carboxylic acids, boric acid, and calcium alkenylsuccinate, and an organic compound having a diurea group consisting of monoamines and aromatic diisocyanates. Lubricant composition for hot rolling of steel.