JPH02102297A - Cold rolling oil composition - Google Patents

Abstract

PURPOSE:To obtain the title composition improved in both stability of a coolant when an abraded powder gets mixed therein and lubricity by incorporating an oxidized wax and a specified dispersant into base oils selected from oil or fat, a fatty acid ester, and a mineral oil. CONSTITUTION:An amino compound/ethylene oxide adduct (e. g., a soybean amine/ethylene oxide adduct) is reacted with an acid compound (e.g., 2- ethylhexanoic acid salt) to give a dispersant comprising at least one salt of an amino compound/ethylene oxide adduct of formula I or II (wherein R is 12-18C alkyl; a+b and c+d+e are each 5 to 20). At least one base oil selected fro,n oil or fat, a fatty acid ester, and a mineral oil (e.g., beef tallow) is mixed with an oxidized wax having a melting point of 60 deg.C or lower, 0.5-10wt.% said dispersant and, if necessary, an oiliness improver, an extreme-pressure additive, a rust preventive, an antioxidant, a surface active agent, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to cold rolling oil compositions. Therefore, the present invention can be used in industries that manufacture lubricants and industries that process metals.

[Conventional technology]

In general, cold rolling oil uses oil, fatty acid ester, mineral oil, etc. as a base oil, and oiliness improvers such as fatty acids and alcohol.
Lubricating oil components containing extreme pressure additives, rust preventives, antioxidants, etc. are made into an emulsion (commonly known as coolant) using an emulsifier.
It is usually used at a concentration of 10% to 10% by weight.

On the other hand, rapid progress in rolling equipment and technology in recent years has led to higher rolling speeds and mass production, and demands for rolling oils such as lubricity and workability are increasing.

However, conventional rolling oil using an emulsifier exhibits contradictory characteristics between adhesion to the surface of the rolled material and circulation stability of the coolant. In other words, if you try to improve the circulation stability of the coolant by adjusting the type and amount of the emulsifier, the adhesion to the surface of the rolled material will decrease, resulting in insufficient lubricity; on the other hand, if you try to increase the adhesion of the rolling oil, However, the circulation stability of the coolant is reduced, which impedes long-term circulation use, and there are also disadvantages such as deterioration of workability and surface quality of the rolled material.

As a rolling oil composition for eliminating the above-mentioned drawbacks, there is a composition disclosed in JP-A-62-112695. The composition comprises (a) one or more base oils selected from the group consisting of fats and oils, fatty acid esters, and mineral oils, and (b) one or two salts of ethylene oxide adducts of amino compounds. This is a cold rolling oil composition characterized by containing the following two dispersants as essential components.In this composition, the amount of dispersant added is less than the total amount of the cold rolling oil composition. 0.5 to 1 of
0% by weight is recommended. However, in this rolling oil composition, wear particles generated during rolling process are mixed into the coolant, resulting in
Particle size distribution and emulsion stability index (Emulsion 5t
ability Index) (This is referred to as “ES, 1
．． It is abbreviated as J. ) changes, and the emulsion stability of Coolan i decreases. In particular, if the fluidity of the liquid is poor due to the structure of the coolant tank or the state of stirring in the tank, E, S
, 1. Since the rolling oil is low, the rolling oil separates and floats in the tank, reducing the concentration of the rolling oil supplied to the rolling mill by the pump. For this reason, the sticking property of the rolling oil to the surface of the rolled material is low, resulting in a disadvantage that the lubricity, surface quality of the rolled material, workability, etc. are reduced.

[Problem that the invention seeks to solve]

The object of the present invention is to provide a cold rolling oil that does not have the above-mentioned drawbacks, that is, a cold rolling oil that is stable as a coolant even when contaminated with wear debris and has excellent lubricity.

[Means for solving problems]

As a result of intensive research in order to solve the above-mentioned drawbacks of the conventional rolling oil, the present inventors found that by adding an oxidized wax with a melting point of 60°C or less to the composition disclosed in JP-A-62112695, It was discovered that the above-mentioned drawbacks of the conventional rolling oil can be overcome, and the present invention has now been completed.

That is, the present invention provides (a) one or more base oils selected from the group consisting of fats and oils, fatty acid esters, and mineral oils, and (b) a melting point of 60°.
Contains as essential components one or more dispersants of a fermented wax of C or less and (c) a salt of a fermented ethylene adduct of an amino compound represented by the following general formula (I) or (II). The present invention relates to a cold rolling oil composition characterized by comprising:

(However, R in the formula represents an alkyl group having 12 to 18 carbon atoms, and a+b and c+d+e each represent an integer of 5 to 20.) Below, the constituent elements of the present invention will be explained in detail.

<Base oil> Examples of the base oil for the cold rolling oil composition of the present invention include mineral oils such as general machine oils listed in Japanese Industrial Standards (JIS) K2238, general turbine oils listed in JIS K2213i, and beef tallow. , soybean oil, rapeseed oil, castor oil, bran oil, coconut oil, palm oil, etc.; fatty acids obtained from these animal and vegetable oils and those containing 1 carbon atom;
Examples include esters of 22 with aliphatic alcohols.

The above aliphatic alcohols include monohydric alcohols such as methanol, ethanol, propatools, butanols, octyl alcohols, oleyl alcohol, and stearyl alcohol, and polyhydric alcohols such as ethylene glycol, neopentyl alcohol, and pentaerythritol. For example,

<Oxidized wax> The oxidized wax in the present invention has the effect of maintaining emulsion stability when used in combination with a dispersant, which is an essential component of the present invention, that is, a salt of an ethylene oxide adduct of a specific amino compound as component (c). It is something that demonstrates the. As the oxidized wax of the present invention, natural or synthetic oxidized waxes, oxidized paraffin, petrolatum oxide, etc. can be used. Further, it is necessary that the melting point of these oxidized waxes is 60°C or lower. Generally, cold rolling oil is circulated and used as a coolant at a temperature of 60° C. or lower, so if the melting point of the oxidized wax exceeds 60° C., a part of it will precipitate and the emulsion stability will deteriorate.

<Dispersant> In the cold rolling oil composition of the present invention, component (c), that is, the salt of the ethylene oxide adduct of the amino compound acts as a dispersant.

Ethylene oxide adducts of amino compounds include those commercially available as ethylene oxide adducts of amino such as coconut amino, tallow amino, lauryl amino, and oleyl amino;
Alternatively, commercially available ethylene oxide adducts of diamino such as coconut propylene diamino, beef tallow propylene diamino, laurylpropylene diamino, and oleylpropylene diamino can be used.

In order to produce a salt of an ethylene oxide adduct of an amino compound, the ethylene oxide adduct of an amino compound may be reacted with an acid. Acids that can be used at this time include phosphoric acids, boric acid, mono- or dialkyl acid phosphoric acid esters having 2 to 8 carbon atoms, lower to intermediate carboxylic acids (
Examples include fatty acids such as formic acid, acetic acid, propionic acid, and octylic acid, dicarboxylic acids such as oxalic acid, succinic acid, and malonic acid, and oxyacids such as glycolic acid, lactic acid, α-oxybutyric acid, and malic acid. be able to.

<Composition method> The cold rolling oil composition of the present invention is prepared by mixing the above-mentioned base oil, oxidized wax, and dispersant, and adding various known additives as necessary, such as an oiliness improver, an extreme pressure agent, and a rust inhibitor. , an antioxidant, a surfactant, etc. are added to the composition. In the composition, the amount of the dispersant added is 0.5 to 10% of the total amount of the cold rolling oil composition.
Preferably, it is % by weight. The amount of dispersant added is 0.5
If it is less than 10% by weight, the cold rolling oil composition will not be well dispersed in water, and if it exceeds 10% by weight, the particle size will become too small and the plate-out property will deteriorate, impairing the lubricating performance of the cold rolling oil. .

<Optional Additives> As various additives that can be used in the composition of the present invention, the following can be used.

Oiliness improvers include higher fatty acids such as oleic acid and stearic acid, dimer acids, esters of the above acids and monohydric alcohols, and esters of the above acids and polyhydric alcohols (e.g. pentaerythritol, trimethylolpropane, etc.). esters, etc.; as extreme pressure agents, trialkyl phosphates,
Dialkyl phosphates, triallyl phosphates, and other phosphoric acid compounds, and as antioxidants,
Examples include phenolic compounds such as phenyl-α-naphthylamino and 2,6-di-t-butyl-p-fresol, and aromatic amino acids such as phenyl-α-naphthylamino.

<How to use) The cold rolling oil composition of the present invention is diluted with water before use. The concentration when used is 0.5 to 10% by weight.

〔Example〕

Next, Examples and Comparative Examples (i.e., JP-A-62-1126
The present invention will be specifically explained with reference to Examples of the composition described in Japanese Patent No. 95. However, the following Examples and Comparative Examples do not limit the present invention in any way.

Example 1 Beef tallow...91 parts by weight Petrolatum oxide (melting point: 50°C, 1 day wood wax)...
3 parts by weight Soybean amino acidified ethylene adduct (number of moles added: 5 moles)
2-ethylhexylate...1 part by weight of 2-2-ethylhexylate per unit amount of ethylene oxide of soybean amino (number of moles added: 15 moles)
Ethylhexylate...2 parts by weight Pentaerythritol monooleate...3 parts by weight Example 2 Beef tallow...89 parts by weight Petrolatum oxide (melting point 50°C, manufactured by Nippon Seiro ■)...5
Weight part: Ethylene oxide adduct of coconut amino (number of moles added: 5 moles)
Didodecyl acidic phosphoric acid ester salt of... 1.5 parts by weight Didodecyl acidic phosphoric acid ester salt of ethylene oxide adduct of coconut amino (number of moles added: 10 moles)... 1.5 parts by weight Monooleate...3 parts by weight Example 3 Beef tallow...93.5 parts by weight Oxidized wax (melting point 42°C, manufactured by Hiki Seiro ■)...3 parts by weight Butylated ethylene adduct of oleyl propylene diamino fl
Malonate of oleylpropylene diamino (additional mole number: 5 moles) of malonate...1 part by weight Malonate of oleylpropylene diamino ethylene oxide (additional mole number of 20 moles)...2.5 parts by weight Comparative Example 1 Beef tallow... - 94 parts by weight 2-ethylhexylate of soybean amino ethylene oxide adduct (5 moles added) 1 part by weight 2-ethylhexylate of soybean amino ethylene oxide adduct (15 moles added) Ethylhexylate: 2 parts by weight Monooleate of pentaerythritol: 3 parts by weight Comparative Example 2 Beef tallow: 94 parts by weight Dodecyl acidic phosphate ester salt of ethylene oxide adduct of coconut (number of moles added: 5 moles) ...1.5 parts by weight Dodecyl acidic phosphate ester salt of ethylene oxide adduct of coconut amino (number of moles added: 10 moles)...1.5 parts by weight Monooleate of pentaerythritol...3 parts by weight Comparative Example 3 Beef tallow ... 96 parts by weight Malonic acid salt of ethylene oxide adduct of oleylpropylene diamino (number of added moles: 5 moles) ... 1 part by weight Malonic acid salt of ethylene oxide adduct of oleylpropylene diamino (number of added moles of 20 moles) ...2.5 parts by weight The following performance tests were conducted on each of the compositions of Examples 1 to 3 and Comparative Examples 1 to 3 thus obtained. The results are shown in Table 1 and FIG.

<Emulsification stability> After adjusting the 3% by weight emulsion of each composition by IHr stirring with a stirrer (M-type homo mixer), 2000 ppm of fine particle iron powder (particle size 0.02 to 0.03 JLm) was added, and The mixture was stirred for 2 hours. E, S, before and after fine particle iron powder,
1. and the dispersed oil particle size was measured. Test conditions and E
,S.

■0. The method for measuring particle size is as follows.

Stirrer rotation speed: 10,00Orpm Liquid amount: 800g Liquid temperature: 50°C E, S, 1. 7,200 ml of the oil was placed in a cylindrical separatory funnel and allowed to stand, and after 15 minutes, the bottom sample was collected and the oil concentration was determined using the following formula.

Particle size: According to Coulter counter.

Chapter 1 Table calculate Rolling oil compositions are E and S even when iron powder is mixed in.

(2) Excellent emulsion stability with small decrease in .

〔Effect of the invention〕

Even when the cold rolling oil composition of the present invention is circulated for a long period of time under conditions with poor stirring efficiency in the coolant tank, the rolling oil can be separated and floated in the tank or the coolant sent to the rolling mill. Since there is no decrease in the concentration of
The emulsified dispersion state can be stably maintained. As a result, it becomes possible to improve rolling workability, stabilize rolling lubrication performance, and manufacture high-precision, high-quality steel plates.

[Brief explanation of the drawing]

FIG. 1 is a graph showing the performance of Examples 1 to 3 and Comparative Examples 1 to 3. Applicant Yushiro Chemical Industry Co., Ltd.

Claims (1)

[Scope of Claims] (a) one or more base oils selected from the group consisting of oils and fats, fatty acid esters, and mineral oils, (b) oxidized waxes with a melting point of 60°C or less, and (c) the following general One or more dispersants of salts of ethylene oxide adducts of amino compounds represented by formula (I) or (II) ▲Mathematical formulas, chemical formulas, tables, etc. available▼(I) ▲Mathematical formulas, chemical formulas, tables, etc. (II) (In the formula, R represents an alkyl group having 12 to 18 carbon atoms, and a+b and c+d+e each represent an integer of 5 to 20.) Cold rolling oil composition.