KR101011892B1 - Cold rolling oil composition - Google Patents

Abstract

The present invention, together with the base oil, 0.5 to 30% by mass of a diester obtained from an aliphatic dicarboxylic acid having 12 to 28 carbon atoms and an aliphatic alcohol having 1 to 9 carbon atoms composed of a saturated or unsaturated hydrocarbon chain, and phosphorus compounds 0.01 to It relates to a cold rolled oil composition containing 5.0% by mass. It is excellent in heat scratch prevention performance (rolling property) and can suppress the glossiness nonuniformity of a rolled sheet.

Description

Cold Rolling Oil Composition {COLD ROLLING OIL COMPOSITION}             

TECHNICAL FIELD The present invention relates to a cold rolled oil composition, and more particularly, to a cold rolled oil composition capable of improving heat scratch prevention performance (rollability) and, in particular, suppressing gloss unevenness of a rolled sheet made of stainless steel.

In rolling of a metal material, when rolling is normally performed, the phenomenon in which the walking roll of the part which the rolling material passed through is colored in a constant color tone called roll coating occurs. This roll coating has a great relationship with the rolling property and the surface property of a rolled product in that the said working roll is always in direct contact with a rolling material.

Since the said working roll thermally expands by frictional heat and processing heat by rolling a metal material, the rolling pressure of a plate width direction becomes nonuniform, and roll coating nonuniformity arises easily. This coating nonuniformity causes nonuniformity on the surface of the rolled plate by transfer, causing gloss nonuniformity, which is a big problem especially in the rolling of metal materials such as stainless steel where high surface quality is required.

By the way, in rolling of hard metal materials, such as stainless steel, in many cases, the small diameter roll which can apply high load per unit area by making small contact area with a material is used as a walking roll. However, if the roll diameter is small, the rigidity of the roll itself is low, and it must be reinforced with a large diameter intermediate roll and a backup roll.

As such a rolling mill, a cluster type rolling mill is known, for example. In this cluster type rolling mill, the backup roll is divided into five or more rolls in the axial direction, which are called divided backup rolls. This split backup roll has a crown adjustment function made of a cylindrical roller bearing of a special design, and the extrusion amount of each bearing can be operated independently by the eccentric bushing mechanism, so that various crown patterns can be made on the working roll. Shape control of a rolled sheet is also possible. In the rolling mill of a split backup roll type, there exist a part which a split backup roll contacts a working roll through an intermediate roll, and a part which is not, and it may cause the nonuniformity in the roll coating mentioned above as a cause. And this roll coating nonuniformity is transferred to a rolling board, and it becomes a cause which a glossiness nonuniformity produces on the rolling board surface.

On the other hand, the performance of the rolling oil used for the rolling process of such a metallic material is required to have excellent rolling property, that is, a high-pressure drop rate is obtained at a low rolling load, and scratches do not occur under severe conditions.

Summary of the Invention

Under these circumstances, the present invention provides a reduction in the gloss unevenness of the rolled sheet due to the roll coating unevenness of the split backup roll, the reduction of the gloss unevenness of the rolled sheet due to the roll coating unevenness in the width direction of the working roll, and the heat scratch prevention performance ( It is an object of the present invention to provide a cold rolled oil composition capable of improving the rolling property).

The present inventors have diligently studied to develop a cold rolled oil composition having the above excellent function, and as a result, a diester obtained from a branched aliphatic dicarboxylic acid and a linear aliphatic alcohol having a carbon number in a specific range, together with a base oil, It was found that the object can be attained by a composition containing a monoester having a carbon number in a specific range and a phosphorus compound in a predetermined ratio, respectively. The present invention has been completed based on these findings.

That is, the present invention

(1) 0.5 to 30 mass% of diester obtained from (C) aliphatic dicarboxylic acid having 6 to 28 carbon atoms and aliphatic alcohol having 1 to 9 carbon atoms, wherein the main skeleton is (A) a saturated or unsaturated hydrocarbon chain, and (C) A cold rolled oil composition comprising 0.01 to 5.0% by mass of a phosphorus compound;

(2) Cold rolling oil composition as described in said (1) whose hydrocarbon chain of aliphatic dicarboxylic acid in diester of (A) component is branched;

(3) (B) The cold rolled oil composition according to the above (1), further comprising 0.5 to 40% by mass of a monoester having 13 to 48 carbon atoms;

(4) Cold rolling oil composition as described in said (1) whose aliphatic dicarboxylic acid in the diester of (A) component is a diester obtained from C12-C28 aliphatic dicarboxylic acid and C1-C6 linear aliphatic alcohol. ;

(5) Cold rolling oil composition as described in said (1) whose aliphatic dicarboxylic acid in diester of (A) component is saturated aliphatic dicarboxylic acid;

(6) The cold rolled oil composition according to the above (1), wherein the phosphorus compound of component (C) is at least one member selected from ortho phosphate esters, amine salts thereof and alkylthiophosphates; And

(7) The cold rolling oil composition as described in said (1) whose phosphorus compound of (C) component is an amine salt of ortho phosphate ester.

In the cold rolled oil composition of the present invention, mineral oil and / or synthetic oil can be used as the base oil.

Various things are mentioned as said mineral oil. For example, distilled oil obtained by atmospheric distillation of paraffinic crude oil, intermediate machinery crude oil or naphthenic crude oil, or by distillation under reduced pressure from the residue of atmospheric distillation, or by purification according to a conventional method. Refined oils, such as solvent refined oil, hydrogenated refined oil, dewaxed oil, clay treatment oil and the like.

Examples of the synthetic oils include poly-α-olefins having 8 to 14 carbon atoms, olefin copolymers (e.g., ethylene-propylene copolymers), or branched olefins such as polybutene and polypropylene, and hydrides thereof, and polyol esters. Ester compounds such as (fatty acid ester of trimethylolpropane, fatty acid ester of pentaerythritol, etc.), alkylbenzene and the like can be used.

In the present invention, as the base oil, one kind of the above mineral oil may be used, two or more kinds thereof may be used in combination, one kind of the synthetic oil may be used, or two or more kinds thereof may be used in combination. Moreover, 1 or more types of said mineral oils and 1 or more types of synthetic oils can also be used together. And as said base oil, it is preferable that dynamic viscosity in the temperature of 40 degreeC exists in the range of 1-30 mm <2> / s. If the kinematic viscosity is less than 1 mm 2 / s, the flash point is low, and there is a risk that the risk of fire due to ignition may be increased. It may become a cause of the defect which generate | occur | produces a winding shift | offset | difference. More preferable kinematic viscosity is 4-20 mm <2> / s.

In the composition of the present invention, as the component (A), a diester obtained from an aliphatic dicarboxylic acid having 6 to 28 carbon atoms and an aliphatic alcohol having 1 to 9 carbon atoms whose main skeleton is composed of a saturated or unsaturated hydrocarbon chain is used.

If the aliphatic dicarboxylic acid is less than 6 carbon atoms, the heat scratch prevention performance is inferior, whereas if the aliphatic dicarboxylic acid is more than 28 carbon atoms, the solubility of the diester is poor, especially when using a low viscosity base oil. Preferable carbon number is 12-28, More preferably, it is 14-24, Especially 16-20 are preferable.

In addition, the aliphatic dicarboxylic acid preferably has a branched chain, and by having a branched chain, there is an advantage that the solubility of the diester becomes good so that a rolling oil composition having a desired performance can be easily obtained.

In this invention, although any of saturated and unsaturated can be used as said aliphatic dicarboxylic acid, saturated aliphatic dicarboxylic acid is preferable among these. As this saturated aliphatic dicarboxylic acid, the compound represented, for example by following formula (I) is mentioned preferably.

Where

k represents an integer of 0 to 3,

m and n each represent an integer of 1 to 23,

The sum of k, m and n is an integer of 8-24.

In this invention, the compound etc. which are represented by a following formula are mentioned as a specific example of C6-C28 aliphatic dicarboxylic acid whose main skeleton used for the diester which is (A) component consists of a saturated or unsaturated branched hydrocarbon chain. .

In addition, as an aliphatic alcohol, a C1-C9 thing is used. If this carbon number exceeds 9, the solubility of diester will worsen. Preferable carbon number is 1-6, More preferably, it is 1-4. In addition, the aliphatic alcohol is preferably linear. If it has a branched chain, heat scratch prevention performance may be inferior.

Specific examples of such linear aliphatic alcohols include methanol, ethanol, n-propanol, n-butanol, and the like.

In this invention, the diester obtained from the said aliphatic dicarboxylic acid and aliphatic alcohol is used as (A) component, This diester may be used individually by 1 type, and may be used in combination of 2 or more type. In addition, content of the said diester in a rolling oil composition is selected in the range of 0.5-30 mass%. When this content is less than 0.5 mass%, the effect of the reduction of the gloss nonuniformity of a rolled sheet and the improvement of a heat scratch prevention performance is not fully exhibited, and the objective of this invention cannot be achieved. On the other hand, if it exceeds 30% by mass, no improvement of the effect is observed compared to the amount thereof, which is rather economically disadvantageous. Preferable content of the said diester is the range of 1-20 mass%, and the range of 1-15 mass% is especially preferable.

In the composition of this invention, it is preferable to further contain C13-48 monoester as (B) component. By using this monoester in combination with the diester of the said (A) component, the effect of further reducing gloss nonuniformity and the improvement of a heat scratch prevention performance is exhibited compared with the case of using diester alone. In addition, by using this monoester, the amount of diester used can be reduced.

As monoester of the said (B) component, the compound represented by following formula (II) is mentioned, for example.

Where

R represents an alkyl group having 11 to 22 carbon atoms,

R ¹ represents an alkyl group having 1 to 25 carbon atoms,

The total carbon number of R and R ¹ is 12 to 47.

Preferable carbon number of the monoester represented by the said Formula (II) is the range of 13-36. Specific examples of the monoester include methyl stearate, butyl stearate, octyl stearate, octyl palmate, and the like, but among these, butyl stearate is preferable from the viewpoints of performance and availability.

In this invention, 1 type of said monoester may be used as (B) component, and may be used in combination of 2 or more type. Moreover, the content of the said monoester in a rolling oil composition has the preferable range of 0.5-40 mass%. When this content is less than 0.5 mass%, the effect of the reduction of the gloss nonuniformity of a rolled sheet and the improvement of a heat scratch prevention performance is not fully exhibited, and the objective of this invention may not be achieved. On the other hand, when it exceeds 40 mass%, the improvement of an effect is not observed compared with the quantity, it becomes rather economically disadvantageous, and also low temperature fluidity may deteriorate. Preferable content of the said monoester is 3-30 mass%, and the range of 5-20 mass% is especially preferable.

In the composition of this invention, a phosphorus compound is used as (C) component. There is no restriction | limiting in particular as this phosphorus compound, For example, ortho phosphate ester, its amine salt, alkylthio phosphate, etc. are used preferably, and the amine salt of ortho phosphate ester is preferable among these.

Examples of the ortho phosphate ester include compounds represented by the general formula (III).

Where

R ² , R ³ and R ⁴ are each a hydrogen atom or a hydrocarbon group having 4 to 20 carbon atoms, and they may be the same as or different from each other, but at least one of them is preferably a hydrocarbon group having 4 to 20 carbon atoms.

As a hydrocarbon group of 4 to 20 carbon atoms, a straight, branched or cyclic alkyl group or alkenyl group of 4 to 20 carbon atoms, an aryl group of 6 to 20 carbon atoms, an alkylaryl group of 7 to 20 carbon atoms, or an arylalkyl group of 7 to 20 carbon atoms Etc. can be mentioned. Among these, an alkylaryl group having 7 to 20 carbon atoms is preferable. Specific examples thereof include butyl, pentyl, hexyl, cyclohexyl, octyl, decyl, lauryl, myristyl, palmityl, stearyl, oleyl, eicosyl, phenyl, methylphenyl and isopropyl A phenyl group, a xylyl group, a benzyl group, a phenethyl group, etc. are mentioned, Among these, a methylphenyl group and an isopropylphenyl group are especially preferable.

Moreover, as an amine salt of ortho phosphate, the compound represented by following formula (IV) is mentioned.

Where

R ⁵ is a hydrocarbon group having 4 to 20 carbon atoms, preferably a hydrocarbon group having 8 to 18 carbon atoms, more preferably a hydrocarbon group having 12 to 18 carbon atoms,

R ⁶ is a linear, branched or cyclic alkyl or alkenyl group having 4 to 20 carbon atoms, and having 8 to 18 carbon atoms, more preferably a straight, branched or cyclic alkyl or alkenyl group having 12 to 16 carbon atoms. Desirable,

a and b are 1 or 2, respectively

Some R <^5> may be the same and may differ, and some R <^6> may be the same and may differ.

About the C4-C20 hydrocarbon group represented by said R <^5> , it is the same as that of the C4-C20 hydrocarbon group in R <^2> -R <^4> in Formula (III) mentioned above. Examples of R ⁶ include butyl, pentyl, hexyl, cyclohexyl, octyl, decyl, lauryl, myristyl, palmityl, stearyl, oleyl and ecosyl groups.

On the other hand, examples of the alkylthiophosphate include various monothiophosphates, dithiophosphates, trithiophosphates, etc. in which an alkyl group is a linear, branched or cyclic saturated or unsaturated group having 4 to 20 carbon atoms. Here, as said alkyl group, the same thing as the group illustrated by description of R <^{6> in} the said General formula (IV) is mentioned.

In this invention, the phosphorus compound of the said (C) component may be used individually by 1 type, and may be used in combination of 2 or more type. Moreover, content of the said phosphorus compound in a rolling oil composition is selected in the range of 0.01-5.0 mass%. When this content is less than 0.01 mass%, the gloss nonuniformity suppression effect is not fully exhibited, whereas when it exceeds 5.0 mass%, an effective improvement is not observed compared with the quantity, and it becomes rather economically disadvantageous. Preferable content of the said phosphorus compound is the range of 0.02-4 mass%, and the range of 0.1-3 mass% is especially preferable.

The composition of the present invention can be suitably contained in various kinds of additives such as antioxidants, rust inhibitors, corrosion inhibitors, antifoaming agents and the like, alone or in combination of two or more thereof, as long as the object of the present invention is not impaired.

Examples of the antioxidant include amines such as alkylated diphenylamine, phenyl-α-naphthylamine and alkylated α-naphthylamine, phenols such as 2,6-di-t-butyl-p-cresol, and sulfur series. And rust preventive agents and corrosion inhibitors, for example, sorbitan ester, neutral alkali metal or alkaline earth metal sulfonate, alkali metal or alkaline earth metal phenate, alkali metal or alkaline earth metal salicylate, thiadiazole, benzo Triazole, and the like. In addition, examples of the antifoaming agent include dimethylpolysiloxane and fluoroether.

10 mass% or less is preferable, and, as for the sum total content of the additive used according to such a need, 5 mass% or less is more preferable.

In the rolling oil composition of this invention, although it does not restrict | limit especially about the viscosity, In order to acquire lubricity and glossiness of plate surface, the range of 1-20 mm <2> / s is preferable, and the range of 2-10 mm <2> / s is especially preferable. Do.

The cold rolled oil composition of this invention which has such a composition shows the effect shown below.

(1) With the rolling mill of the type which used the split backup roll, while performing shape control by a split backup roll, a roll coating nonuniformity and the gloss nonuniformity of a rolled sheet can be reduced. That is, the shape and surface quality (glossy nonuniformity) of a rolled product can be improved.

(2) When the rolling speed is increased, the amount of heat generated per unit time at the time of rolling is large, and the heat storage of the roll is increased, resulting in uneven thermal expansion in the plate width direction. By using a rolling oil composition, even if it raises a rolling speed, a glossiness nonuniformity will become hard to produce.

(3) Heat scratch prevention performance is improved.

(4) From said (1)-(3), improvement of productivity and product quality improvement can be made compatible.

The metal material to which the cold rolled oil composition of the present invention is applied is not particularly limited, but is preferably applied to stainless steel among the metal materials.

Next, although an Example demonstrates this invention further more concretely, this invention is not limited at all by these examples.

Examples 1-9 and Comparative Examples 1-5

(1) Preparation of cold rolled oil composition

About paraffin machine mineral oil whose kinematic viscosity of 40 degreeC is 8.0 mm <2> / s, the cold rolling oil composition was prepared by mix | blending the component shown in Table 1 with the quantity shown in Table 1 based on the composition whole quantity.

In addition, the used component is as follows.

Monoester: butyl stearate

Diester 1: diester of aliphatic dicarboxylic acid and methyl alcohol having a branched chain represented by the following formula (using Japanese Patent Publication No. 1995-45674 A of Table 1)

Diester 2: Diester of aliphatic dicarboxylic acid and methyl alcohol having a branched chain represented by the following formula (I use Table 1 of Japanese Patent Application Laid-Open No. 1995-45674)

Diester 3: Adipic acid diisononyl (DINA)

TCP: Tricresylphosphate

Amine salts of phosphate esters: Alkylamine salts having 12 to 14 carbon atoms of dioleyl acid phosphate

(2) rolling experiment

In the rolling experiment conditions shown in Table 2, rolling experiments were carried out according to the pass schedule shown in Table 3, the gloss unevenness during high-speed rolling was evaluated in the third pass, and the pressure roll (outer diameter 135 mm, 10 mm width) was pressed to 19.6 kN, and the gloss nonuniformity of the contact part and non-contact part of a split roll was evaluated. In addition, the heat scratch limit reduction ratio was calculated in the fifth pass to evaluate the heat scratch prevention performance. (51th Plastic Processing Association Lecture (November 3 to 5, 2000) Preview, see pages 303 to 304, "Simulation of Surface Gloss Unevenness by Split Roll in Stainless Steel Cold Rolling").

The results are shown in Table 1. In addition, glossiness nonuniformity evaluated the following four steps visually.

0: no non-uniformity

1: faintly uneven

2: Able to identify certain nonuniformities

3: unevenness in intensity is observed

According to the present invention, the gloss unevenness of the rolled sheet due to the roll coating unevenness of the divided backup roll, the gloss unevenness of the rolled sheet due to the roll coating unevenness in the width direction of the working roll, and the heat scratch prevention performance (rolling property) ), It is possible to provide a cold rolled oil composition, which is particularly suitable for rolling stainless steel.

Claims (9)

delete delete delete delete delete delete delete Together with the base oil, (A) 0.5-30 mass% of diester obtained from the C6-C28 aliphatic dicarboxylic acid and C1-C9 aliphatic alcohol which consists of saturated or unsaturated hydrocarbon chain, and (C) phosphorus compound Cold rolling oil composition comprising 0.01 to 5.0% by mass, (C) the cold rolling oil composition characterized in that the phosphorus compound of the component is ortho phosphate ester represented by the following general formula (III): [Formula III]

here, R ² , R ³ and R ⁴ are each a hydrogen atom or a hydrocarbon group having 4 to 20 carbon atoms, and they may be the same or different from each other, but at least one of them is a hydrocarbon group having 4 to 20 carbon atoms. Together with the base oil, (A) 0.5-30 mass% of diester obtained from the C6-C28 aliphatic dicarboxylic acid and C1-C9 aliphatic alcohol which consists of saturated or unsaturated hydrocarbon chain, and (C) phosphorus compound Cold rolling oil composition comprising 0.01 to 5.0% by mass, A cold rolled oil composition, wherein the phosphorus compound of component (C) is an amine salt of ortho phosphate ester represented by the following general formula (IV): [Formula IV]

here, R ⁵ is a hydrocarbon group of 4 to 20 carbon atoms, R ⁶ is a straight, branched or cyclic alkyl or alkenyl group having 4 to 20 carbon atoms, a and b are 1 or 2, respectively Some R <^5> may be the same and may differ, and some R <^6> may be the same and may differ.