DE1256345B - Lubricants - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

PATENT LETTERING

Int. α .:

ClOm

German KL: 23 c -1/04

Number:

File number:

Registration date:

1256345
M61843IVc / 23c
June 22, 1964
December 14, 1967
!. August 1968

Display day:

Issue date:

The patent specification corresponds to the patent specification

It is already known to have a layer lattice structure Solids, especially graphite, sulfides of the Π. Group of the periodic table, especially zinc sulfide and cadmium sulfide, inorganic fluorides, especially calcium fluoride, other sodium-aluminum fluorides, especially cryolite in dry powder form, in liquid or pasty carriers or in paints as Use lubricant. Substances of this kind have an essential character, especially in dry form Disadvantage that they do not adhere well to the surfaces, so that often special mechanical precautions, such as lapping, vigorous rubbing or the addition of the adhesiveness-improving additives, are necessary. As a result of the poor adhesiveness, it results a correspondingly reduced lubricating effectiveness, so that, for example, when using graphite as Lubricant and the Almen-Wieland machine already pressing occurs with a load of 50 kg.

It has now been found that the lubricating effectiveness of the solid lubricants especially in dry form by their surface treatment with alkali, alkaline earth or ammonium sulfides, sulfites, sulfates, thiosulfates, persulfates, halides or cyanamides can be significantly improved. Crucial The anions are important here, i.e. in finely divided form with the solid lubricants must be mixed. The cations have hardly any effect on the lubricating effectiveness of the products an influence.

When graphite preparations were used according to the invention, the following values were measured:

Lubricants

Investigation method graphite According to the invention
graphite AWM
Load, kp
Friction force, kp
PRESS-FIT TEST
Net coefficient
LFW-I
Rotation at
Film destruction ..... 50
> 0.3
2000 2000
250 to 340
12,000 to 14,000

In particular, those solid lubricants have proven to be useful, which with the salts in question in intimate distribution in an amount of 0.2 to 0.4, preferably 1 to 2 percent by weight, based on the dry weight of the solid lubricant.

Patented for:

Molykote limited liability company, 8000 Munich 54, Pelkovenstr. 152

Named as inventor:

Dr. Wilhelm Sibert, 8000 Munich

Solid lubricants with a layered lattice structure are mainly used for loading graphite, Sulphides of group II of the periodic table, especially zinc sulphide and cadmium sulphide, inorganic

ao see fluoride, especially calcium fluoride, cryolite (Na-Al-fluoride) into consideration; Molybdenum disulfide and tungsten disulfide are not excluded.

The use of such solid lubricants, their loading with, gives particularly favorable results

as fluoride or mixtures of thiosulphate and fluoride took place.

When carrying out the loading of the solid lubricants, organic, but in particular inorganic solvents with a high dielectric constant can be used as solvents. In general, water or a mixture containing water is used here. Such aqueous preparations can be mixtures of liquids as well as mixtures of water and dissolved therein, e.g. B. comprise solids acting as anion solubilizers. Accordingly, in addition to water, solvents that can be used in the context of the present invention are, for example, ammonia, dioxane, alcohols, in particular lower aliphatic alcohols, or mixtures of these solvents. The removal of the solvent can be effected by any of the usual drying methods, suction, etc. For example, the solvent can be stripped off by heating at 50 to 150 ⁰ C.

The residue formed from the solid lubricant and the loading agent can then be crushed or be pulverized.

It is also possible to manufacture lubricants in the form of dispersions, pastes, etc. the solid lubricant and as alkali, free alkali or Add ammonium salt of the type in question directly to the lubricant carrier.

80 «W91

In addition to the use as dry lubricants, it can also be used alone or together with the customary lubricant additives in liquid or pasty carriers, paints or plastics without further possible.

The table below and the examples show the technical progress of the claims Lubricant.

Graphite (ultrafine)

Pure graphite

(50 kp break)

Graphite with sodium thiosulphate load Frictional force Graphite with sodium fluoride treated kp kp treated 100 19th Frictional force 500 75 kp 1000 182 21 1500 246 68 2000 293 157 214 276

graphite with sodium sulfite load Frictional force Graphite with calcium cyan treated kp kp amide treated 100 11th Frictional force 500 99 kp 1000 142 12th 1500 237 123 2000 294 300 _ -

powder = 1: 1, resulted on the Almen-Wieland machine with a load of 2000 kg a final friction force of 310 kg, while with untreated graphite powder fracture occurs at a load of 50 kg.

Example 3

Graphite powder was mixed with technical grade ammonium sulfide in an aqueous solution in a weight ratio of 1: 1 ίο treated. With a load of 2000 kg, a Final friction force of 327 kg is reached, while with graphite powder as a lubricant already at 50 kg Load on the Almen-Wieland machine break occurred.

B e i s ρ i e 1 4

Graphite powder treated with cryolite in a weight ratio of 1: 1 resulted in a final friction force * o of more than 350 kg on the Almen-Wieland machine under a load of 1950 kg.

Example 5

Graphite powder treated with sodium fluoride in a weight ratio of 1: 1 resulted on the Almen-Wieland machine with a load of 2000 kg a final friction force of 300 kg.

Paste with graphite load Frictional force Paste with graphite 7th and paraffinic kp kp (Sodium thiosulfate) and paraffin 81 mineral oil 100 12th basic mineral oil 154 2000 kp ... 328 500 126 Frictional force 283 1000 193 kp 1500 305

30th

35

example 1

45

Graphite powder was treated with sodium thiosulfate (dissolved in water). In the table are the Results compiled on the Almen-Wieland machine for comparison.

Lubricant load End
friction
power kg kg a) Graphite powder 50 fracture b) Graphite powder with
Sodium thiosulfate (1: 1) 2000 300 c) Graphite powder with
Sodium Thiosulfate (10: 4) ... 1700 > 35O d) Graphite powder with
Sodium Thiosulfate (10:15) .. 1750 > 350

Example 6

Graphite powder treated with calcium cyanamide in a weight ratio of 1: 1 resulted in the Almen-Wieland machine a final friction force of more than 350 kg at a load of 1200 kg.

Example 7

Cryolite powder treated with sodium fluoride in a weight ratio of 1: 1 resulted in shaft breakage on the Almen-Wieland machine only with a load of 1000 kg, while with cryolite alone the breakage occurs 500 kg load takes place.

Examples

Zinc sulphide, treated with sodium fluoride in a weight ratio of 1: 1, did not result in shaft breakage until 750 kg Load, while with zinc sulfide alone shaft breakage on the Almen-Wieland machine is already at 250 kg Load took place.

Example 9 Example 2

Graphite powder, treated with sodium sulfate, the weight ratio of sodium sulfite to graphite-graphite powder was treated with sodium thiosulfate as before. The weight ratio of sodium thiosulfate to graphite is 1: 1. Rings of LFW-I Testing machine rubbed in after Sunday. at A full load of 290 kg and a set maximum coefficient of friction of 0.3 resulted in an average of 12740 revolutions. Graphite powder alone allowed only 1470 revolutions under the same conditions.

B e i s ρ i e 1 10

Solid lubricant prepared according to Example 1 is mixed with the same White oil made a paste '. On the Almen-Wieland-

Machine results in a load of 2000 kg a final friction force of 226 kg, while the The same paste with untreated graphite cannot avoid seizing under these conditions.

Example 11

It is a 5 ° / _o by weight suspension of l sample, d) produced solid lubricant in paraffinic mineral oil manufactured. On the Almen-Wieland machine a Endreibungskraft of 298 kg yields at 2000 kg load, while ⁰ 5 strength when using a /. " Suspension of the untreated

Graphite powder already breaks the shaft under a load of 850 kg.

Claims (1)

Claim: Use of anion-active solutions of alkali, alkaline earth or ammonium sulfides, -suhlten, -Sulfaten, -thiosulf aten, -persulfaten, -halogeniden or cyanamides surface-treated solid lubricants with a layered lattice structure as dry lubricants or lubricant additives. Considered publications:
German explanatory documents No. 1141 742, 1151 336, 709 708/355 12.67 O Bundesdruckerei Berlin