JPS5847097A - High-temperature lubricant composition - Google Patents

Abstract

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

Description

Detailed Description of the Invention This invention provides high-temperature lubrication for use in hot working of various metals and alloys, such as rolling, forging or drawing of iron, extrusion of aluminum or copper, or drawing of tungsten or motuden. agent composition (= related to).

Conventionally, lubricant compositions of this type include lubricating oils, greases, or mixtures thereof with solid lubricants such as graphite powder and tungsten disulfide, or alkali metal sulfates, borates, columnar chlorides, An aqueous dispersion of a fine powder mixture consisting of sodium chloride acetate, graphite powder, and an auxiliary agent added as necessary is known. However, the former ζ is thermally unstable and decomposes during use, causing negative effects on tools and workpieces, and the oil and oil decomposition products significantly affect the working environment. There is a problem of serious pollution, and even in the case of criminals,
%I: It could not be said that satisfactory lubrication performance was exhibited in the manufacture of seamless steel pipes.

In view of this, the present inventors have conducted extensive research with the aim of developing a high-temperature lubricant composition that does not contaminate the working environment and has excellent lubrication performance. This book was developed based on the discovery that a system mainly composed of polymers has excellent affinity for metal surfaces, forms a film with a small coefficient of friction, and exhibits excellent lubrication performance at high temperatures. It is a completed invention.

That is, the present invention provides a high-temperature lubricant composition containing graphite powder to-si by weight and a water-solubilized vegetable polymer &-60 by weight.

The graphite powder used in this invention may be a natural product or a synthetic product.

In addition, the particle size of this graphite powder is usually 100 μm.
Those having the following average particle size and purity of at least IG are used, and among these, those with an average particle size [all to 80p are preferred.

The water-solubilized plant-based polymer as used in the present invention refers to a plant-based polymer that can be dissolved or dispersed in water.

Examples of this include starch and starch derivatives such as methyl starch, ethyl starch, acedel starch, allyl starch, carboxymethyl starch, dialdehyde starch, oxidized starch, modified starch, amylose and amylopectin and its derivatives such as amylose triacetate. , dextrin and its derivatives, agar, and cellulose derivatives such as cellulose ether and cellulose xanthate. Starch systems consisting of starch, amylose, amylopectin, dextrin, and their derivatives are unique in terms of film-forming ability;
preferable. These water-solubilized plant-based polymers may be used alone or in combination of two or more.

In the present invention ζ2, since the water-solubilized species-based polymer itself has the function of scattering graphite powder, the use of a dispersant is not necessarily required. However, the dispersibility of the graphite powder can be further improved by using a powder of the same or different kind with this water-solubilized vegetable polymer.

In addition, in the present invention, some water-solubilized plant-based polymers rot if left for a long period of time, and formaldehyde,
It is preferable to incorporate a preservative such as roseoxybenzoic acid ether.

The blending ratio of the high-temperature lubricant composition of the present invention is usually graphite powder go-os - 5 water-solubilized plant-based ingredients by weight i-go
Mold weight, preferably graphite powder 70 to 90 weight -
1 water-solubilized plant-based polymer 10-10 weight.

The high temperature lubricant composition of the present invention is used as an aqueous lubricant dispersion by dispersing it in water.
Within the range 1: Prepare. If this solid content concentration is too low, the drying time will be long or the thickness of the formed film will become thin, making it impossible to obtain good lubrication performance, and if it is too rough, it will be difficult to apply. The method of using the aqueous lubricant dispersion prepared in this way is to apply the aqueous lubricant dispersion to the surface of the metal to be hot worked or to the surface of tools such as mandrels, dies, rolls, etc. by conventional means. It is applied and dried to form a film on the surface of these metals and tools, which is then processed.

In addition, in the high-temperature lubricant composition of the present invention, 1.
It is also possible to add conventionally known third components such as film stabilizers, rust inhibitors, antioxidants, surfactants, emulsifiers, and extreme pressure agents, and to impart respective characteristics with these additives.

According to Honji iJ1, water-solubilized plant-based polymers are metal*1
1i4: It exhibits an excellent affinity for C-double and forms a film in which graphite powder is uniformly dispersed in -6 didispersion.

Hereinafter, the contents of this invention will be explained in detail based on Examples (;
@clarify.

[Example 1 and snow] Table 1 - Lubricant compositions formulated in the proportions shown in Table g2 and l
A lubricant aqueous dispersion is prepared by dispersing it in water at an i-form concentration,
This aqueous lubricant dispersion was applied onto an iron plate and dried for 10 minutes at .

For this test piece, using a reciprocating friction tester, a load i
kg (contact ball 1/4'), sliding speed [L/-wheel], the friction coefficients at SO.degree. C. and WOO.degree. C. were determined.

The results are shown in the table, and it was found that in all cases the coefficient of friction was surprisingly small and excellent lubrication performance was exhibited.

Patent applicant Nippon Steel Chemical Industry Co., Ltd. Nippon Steel Corporation M5-

Claims (2)

[Claims] (1) A high-temperature lubricant composition characterized by containing 50 to 96% by weight of graphite powder and a water-solubilized plant-based molecule &-io by weight. (2) The water-solubilized plant-based polymer comprises one or a combination of two or more selected from the group consisting of starch, amylose, amylopectin, dextrin, and derivatives thereof. High temperature lubricant composition.