KR820001973B1 - Aqueous rust-proofing rolling oil - Google Patents

Abstract

Rust-proof rolling oil for steel plate consisted of 1-3 wt.% N-alkylalkanoic acid ester which was prepd. by condensation of 26 wt.% N-alkyl N contg. aliphatic acid salt and 74 wt.% aliphatic acid halide in the presence of KOH, 40 wt.% mineral oil, 40 wt.% tallow, and 20 wt.% surfactant. Thus, 280 g N-stearyl-methylamino acetate was reacted with 220 g stearyl chloride in KOH at 50≰C to give (N-stearyl)-methyl aminoacetic acid stearyl ester (sp. gr.0.9747; viscosity 20; acidity 166; sapon, value 166).

Description

Water soluble rust preventive rolling oil

The present invention relates to a water-soluble rust preventive rolling oil for steel sheets.

More specifically, the present invention aims to prevent the pickling coils from rusting during the stationary storage period from the pickling process to the cold rolling process, to prevent gouges in the coil, and to be incorporated into the rolling oil coolant. The present invention relates to a new water-soluble rust-prevented rolling oil which does not have any influence on the rolling oil even if accumulated, and also combines the performance of the cold-rolled oil.

The rust-prevented rolling oils commercialized up to now contain only fatty acid-based esters and mineral oils, and thus are poor in cleanability by the coolant, are susceptible to slipping and glossiness, and are poor in shape when rolling down 0.2 mm or less. Problems such as lack of lubrication performance, such as increased rolling load and roll rolling, have occurred (see, for example, Japanese Patent Publication No. 40-24627). Accordingly, an object of the present invention is to provide a new water-soluble rust-prevented rolling oil in which this conventional drawback is sufficiently solved.

This object of the present invention 1-3 weights of fatty acid esters obtained by heating at 40-60 ° C. for 30 minutes by gradually adding 74% by weight of fatty acid chloride to the 26% by weight of N-alkyl nitrogen fatty acid fatty acid solution in the presence of KOH. It can be achieved by adding and mixing 40 parts by weight of mineral oil, 40 parts by weight of tallow, and 20 parts by weight of surfactant based on the parts.

In the present invention, "N-alkyl nitrogen fatty acid fatty acid" used as a base is an amine-based nitrogen fatty acid derivative, ie, straight chains such as capric acid, myristic acid, lauric acid, palmitic acid, stearic acid and linoleic acid. Saturated fatty acids or reaction products with unsaturated fatty acids such as oleic acid, linoleic acid, linoleic acid, ricinolic acid, arachidonic acid, palmitooleic acid, myristooleic acid or derivatives thereof and N-alkyl nitrogen-containing derivatives.

More specifically, the term "N-alkyl nitrogen fatty acid salt" refers to an alkyl moiety having 6 or less carbon atoms, such as N-methyl, N-ethyl, N-propyl, N-butyl, N-mentyl, N -Refers to an alkali metal salt such as potassium salt or sodium salt on hexyl fatty acid.

As fatty acid chlorides, chlorides such as stearic acid, oleic acid, ederic acid, linoleic acid, linoleic acid, stearic acid and ricinolic acid having up to 18 carbon atoms are used.

In the present invention, the method of preparing the base compounds is represented by the following general formula, and the following scheme is shown.

Wherein R is the saturated straight-chain fatty acid or unsaturated fatty acid mentioned above,

R ', R "and R'" are also alkyl groups having 6 or less carbon atoms as mentioned above.

n is an integer of 1-5.

In the present invention, the reaction solution of the N-alkyl nitrogen-containing fatty acid salt solution and fatty acid chloride should be adjusted to pH 6.5-7.5 with hydrochloric acid.

The reaction product obtained in the present invention is a kind of condensation product made between N-alkyl nitrogen-containing fatty acid salts and fatty acid chlorides, generally speaking alkanoyl N-alkyl-alkanoic acid esters.

Therefore, in the present invention, the synergistic effect is obtained by using the condensation product as a base and adding the additive unique to the present invention as an adjuvant thereto. First, the condensation product was found to be not only excellent in rust prevention property, but also incorporated into and accumulated in rolling oil used for ironing purposes such as cold rolling oil.

This condensation product (ester) also has the advantages of excellent fluidity, no occurrence of carbonization due to frictional heat, and no staining. As a result of a number of tests, it is found that the amount is suitably 1-3 parts with respect to the total weight, but when used below or above, there is a drawback that the rust resistance is rather insufficient. It should be understood that the ratio of addition of other auxiliaries was also chosen for the same reason.

Uji that can be used in the present invention should have the following specifications.

In addition, as the mineral oil, a spindle oil or a machine oil having a medium viscosity having the following properties is used.

In addition, the surfactant should be a mixed type, not a single material, the composition of the mixed surfactant is preferred for carrying out the present invention is as follows.

The properties of the mixed surfactant thus prepared should be as follows.

함질소 물질을 기제로 사용하는 것이 특징인데, 이 화합물은

의 구조를 갖는 오니움(onium) 화합물이므로, 금속 표면의 양극(cathode)과 결합부착하여 보호막을 생성할 뿐만 아니라, 긴 사슬의 아민계 화합물이 짧은 사슬의 지방산 결합물에 비하여 우수한 방청성과 윤활성을 부여할 수 있다는 효과가 있는 것이다.In the present invention

It is characterized by the use of nitrogenous substances as a base,

Since it is an onium compound having a structure of, it is not only bonded to a cathode on a metal surface to form a protective film, but also a long chain amine compound has superior rust resistance and lubricity compared to a short chain fatty acid binder. There is an effect that can be given.

When the present invention is described as an embodiment as follows.

Example 1

Preparation of (N-stearyl) -methylaminoacetic acid stearyl ester.

0.5 g of KOH and 220 g of stearic acid chloride were slowly added to the bottom of the liquid while stirring the solution of 280 g of N-stearyl-methylamino acetate solution, and the mixture was heated to 50 ° C., adjusted to pH 6.5 with hydrochloric acid, and evaporated to remove 450 g of the title compound. Got. This compound is used as a base compound in Examples described later.

The properties of this product were as follows.

Example 2

(N-oleyl) -methylaminoacetic acid oleyl ester 450 was obtained in the same manner as in Example 1 except for using N-oleyl-methylaminoacetic acid salt and oleic acid chloride.

This compound can also be used as a base compound of this invention.

Example 3

Preparation of Antirust Rolled Oil

The compound obtained in Example 1 or 2 is used as a base compound, spindle oil as mineral oil, sorbitan monostearate, polyoxyethylene oleylamine and polyethylene glycol monostearate (65:10) as a surfactant. : The mixed surfactant composed of 15) was combined as in the following samples A, B, C and D. Sample A is a control without formulating a base compound, and Samples B, C and D are rust preventive rolling oils according to the present invention.

Example 4

(A) gloss stain test

Prepare 8 specimens cut into 100mm × 100mm sized mild steel plate (spc-c), immerse 4 sheets in sulfuric acid (500ppm) and hydrochloric acid (500ppm) aqueous solution, and then sample rolling oils A, B, C and D. It was applied to the test surface. Two sheets of sulfuric acid and immersed in aqueous hydrochloric acid are superimposed and fixed with clips, respectively.

One of the test pieces immersed in hydrochloric acid and one coated with sulfuric acid was left for 20 hours at 60 ° C. in the dryer, and the remaining two test pieces were left for 20 hours at a temperature of 60 ° C. and a relative humidity of 100%. After this procedure was completed, one pass rolling was performed under the following conditions to observe the surface of the steel sheet.

(Circle): There is no glossiness, and it is clean like a mirror surface.

(Triangle | delta): Some white stain generate | occur | produces.

X: The whole surface is gloss stain.

(B) Antirust test

(1) High temperature and high humidity test: Sample rolled oil was apply | coated in the ratio of 3 g / m <^{2> to} the steel plate (0.5 mm x 100 mm x 100 mm) cleaned with the solvent naphtha. The steel sheet was superimposed as it was, or after spraying with water and superimposed, the steel sheet was observed after 20 hours of standing in a constant temperature and humidity chamber at a temperature of 60 ° C. and a relative humidity of 100%. The results of the rust were as follows.

○: No rust.

(Triangle | delta): Rust generate | occur | produces in the edge part.

X: Rust occurs in about 1/2 (50%) of the total area.

(2) Indoor exposure test: A mild steel plate (spc) test piece (6cm × 8cm × 0.12cm) was immersed in 5% dilution solution of pre-rolled oil for 3 minutes, then taken out and left in the room as it was, and observed the occurrence of rust. The rust formation state of the subsequent test piece was as following table.

(Circle): No rust generate | occur | produces, Rust generation of several points.

×: 50% rust occurs.

××: 100% rust occurs.

Claims (1)

Alkanoyl N-alkyl-alkanoic acid ester 1-3 obtained by slowly condensing at 40-60 ° C. for 40 minutes by gradually adding 74% by weight of fatty acid chloride to the liquid at 26% by weight of N-alkyl nitrogen fatty acid fatty acid solution in the presence of KOH. A water-soluble rust-preventing rolling oil which added and mixed 40 weight part of mineral oils, 40 weight part of tallows, and 20 weight part of surfactants based on a weight part.