DE1286249B - Lubricating oil or grease - Google Patents

Description

1 2

Frequently reducing the use of additives of the additive combination, in thickened organic liquids or gels, practically no more than 25 percent by weight of clay is used, the addition of normally crystalline sub- based on the weight of the additive. It is punched, which are insoluble in these or only an oleophilic clay is preferred, which also have very limited solubility as Andik, ζ. B. sodium 5 kmittel for the grease can be used m'trit as a corrosion inhibitor in the case of. Such a clay can be made by treating a lubricating oil and grease. These additives are not oleophilic clays with an oleophilic, water-based, after addition, they are more likely to be produced in the form of a physically repellent agent. Preferably shear dispersions than solutions. If you use a non-oleophilic clay that heats or transports dispersions or has acidic surfaces on them. It will preferably be shaken in another way, so divorce a base-exchanging clay derived.
the crystals of the additive or they become A non-oleophilic clay which is filtered off for production when the dispersions are passed through a sieve of an oleophilic clay used according to the invention. The deposited crystals are suitable, a considerable base exchange of the additive can then clog the sieve capacity, preferably 60 to 100 m-equivalents and cause a deposition of other insoluble base per 100 g of clay, licher particles (if any) which otherwise examples of such clay are montmorillonites, which sieve devices would pass through. especially sodium, potassium, lithium and others. These problems are exacerbated when the bentonites, ζ. B. Wyoming bentonite, magnesium possibility exists that the crystals of the additional 20 bentonite (hectorite) and saponite. The clay will grow as a substance in the dispersions and thereby be able to remove most of the gangue normally associated with it, which is still more easily excreted or filtered off. acts. This can be done by dispersing the crude. It has now been found that the growth of the clays takes place in water, with the mixture settling crystals of a normally crystalline, in a layer in layers which, due to their heaviness, disperse the substance, which, or better, through organic liquid Centrifugation at high speed can be separated at this insoluble or essentially insoluble speed. The clay is prevented when a certain additive forms a hydrosol with water; The preferred combination, namely an oleophilic clay as the concentration of the clay in the hydrosol, is thickener and NaNOa as normally 30 1 to 5 percent by weight, so that the hydrosol is relatively crystalline, practically insoluble in a lubricating oil and is liquid, e.g. B. easily transSubstanz used by pumping. can be ported. The hydrosol should then be the subject of the invention is thus a lubricating oil, preferably with a mineral acid (ζ. Β. Phosphorus or fat, containing an additional combination of acid or boric acid) to give the a known oleophilic clay and NaNO2. 35 clay to give acidic surfaces, whereby the acid-additive combination can be incorporated into the lubricating oil amount at least the base exchange capacity of the or -fat in powder form, whereby clay should correspond. When using the components are intimately mixed with one another. Phosphoric acid for treating, for example, such a powder can be obtained by mixing the beehectorite, the amount of acid 4 to 12 parts by weight with each other and grinding to an imperceptible 40 percent, based on the weight of the clay, fine size or by mixing an aqueous after or during the Acid treatment can dissolve. Sodium nitrite with the clay and ent- an oleophilic, water-repellent agent to which hydrosol is added to the watering of the resulting mixture. This remedy can become a. However, in order to facilitate mixing with thickened known organic liquids or for the preparation of hydrophobic organic liquids, the 45 clays can be a common water-repellent agent. Additional combination, advantageously in the form of a paste. Examples of such water-repellent agents are present. The paste can be prepared by adding dodecylammonium chloride, octadecylammonium to the additive combination, a lubricating oil chloride and dicoco oil dimethylammonium chloride, e.g. B. a neutral lubricating oil with high and the corresponding bromides. Other examples of viscosity index and a viscosity of 500 SUS 50 for water repellants are hydrophobic, above 37.8 ° C. The paste preferably contains 30 to 30 surface-active agents which are physically adsorbed at least in part by 50 percent by weight of oil from the clay surfaces. These include long-chain fatty acid amines, to prevent the surface of the paste or to prevent a z. B. Octadecylamm, and in particular aminoamides free flow of the additional combination in Eöfrfi a 55 and imidazolines, which support powder from polyalkylene polyamines , a surface-active and 'polyalkanolamines with saturated or unMittel (z. B. sorbitan mossooleate) can be incorporated. saturated fatty acids are formed. Still further The amount of the surface active agent is Examples of water repellants are polymeric, preferably 0.1 to 5% by weight of the final substances for coating the clay surfaces, composition (e.g. the powder or the paste). 00 z. B. amino resins, phenolic resins and poly

Dis additional combination: can use a larger amount of epoxy resins.

Sodium nitrate, preferably at least 100 g. In general, the water repellent can weight percent based on the weight of the oieo- directly to the acid-treated hydrosol pMen Tones, included. However, it is preferred to. be admitted. In the case of polymeric waterways of the cost 200 to 100 percent by weight, however, repellants can usually be the fz. B. 300 to 700 percent by weight), based on monodas required for the preparation of the agent Weight of oleopMiea clay to use. mer reactants directly to that with acid In order to increase the possibility of agglomeration in treated hydrosols and poly-

be merized. After this treatment, the water can be removed from the hydrosol. Preferably that is; Removed water to make a powder. This powder preferably contains less than 5 weight percent water. Dehydration to remove excess acid can be done by heating and evaporating the water, by filtration or by a combination of the two Methods can be achieved. The clay or the clay hydrosol can additionally be washed out to remove more of the acid, but it is usually not required.

The grease made with this additive combination can be 0.1 to 10 percent by weight (preferably 0.25 to 1 percent by weight) of the additional combination, based on the weight of the Grease.

The following will make various preparations more suitable for the lubricating oils or greases of the invention Additional combinations explained.

Additional combinations A to D

Four samples of corrosion preventive powders A, B, C and D are made by dehydrating four concentrated aqueous sodium nitrite solutions prepared, one of which by treatment with a Aminoamide formed from long-chain tall oil fatty acids and a mixture of polyethylene polyamines water-repellent made hectorite clay powder has been added. To two of these solutions becomes an amount of 1.0 weight percent of a long alkyl chain substituted imidazoline added as a surfactant. All solutions are made by heating and evaporating of the water drained. The hectorite clay powder is diluted by mixing a aqueous sludge of de-gangue hectorite with an aqueous sludge of 40% by weight of the water repellent and 8 percent by weight phosphoric acid, each based on the Based on the weight of the clay, and spray-drying the resulting mixture, with a Clay powder with a water content of less than 5 percent by weight, based on the weight of the clay, is produced. The properties of the powder samples are given in the following table.

rehearse

Components

Scaly NaNOa

water

Water-repellent clay.
Surface active agent
Components

NaNO ₂

Water-repellent clay.
Surface active agent

Wet composition, weight percent

37.3

56.0

6.3

0.4

35.4
53.0
11.6

30.0

55.2

6.8

Dry composition, weight percent

84.8

14.4

0.8

75.3
24.7

84.7
15.3

Samples A and B, which contain the surfactant, dry to a non-stick, free flowing, anhydrous powder. Samples C and D, however, are not surfactants Containing agents are difficult to dry, they stick to the side walls of the vessel in which they evaporate to form rubber-like cakes and then hard lumps. the end this is the reason why the preparation of the additional inhibitor combination the use of a small amount (0.1 to 5%) of a surfactant preferred for dewatering the aqueous solution.

Additional combinations E to K

Several powder samples, E, F, G, H, I, J, and K, of anhydrous sodium nitrite as a corrosion inhibitor containing additional combinations are produced by a dry milling process, by adding about 80 percent by weight dry sodium nitrite with about 20 percent by weight hectorite clay powder be mixed according to Example 1 and the mixture in a ball mill for 45 minutes too impossibly finer Size is wedded.

A small amount of a mineral lubricating oil with a high viscosity index and is added to two samples a small amount of imidazoline is added as a surfactant to another sample.

Dry milling is advantageous in that

it eliminates the possibility of dangerous explosive conditions that may occur if large amounts of nitrite are exposed to high temperatures.

The properties of the samples are given in the table below.

rehearse
GH

Components

NaNO ₂

Water-repellent clay

Composition, percent by weight

81.4 16.3 79.1

19.7

80.0
20.0

87.0
13.0

84.7
14.4

80 _s 0
20.0

continuation

rehearse

Components

500 HVI oil

Surfactant - Particle Size and Description

Composition, percent by weight

2.3 1.2

small, clumped together

These properties show that the addition of a Even a small amount of lubricating oil can cause undesirable agglomeration. It appears furthermore that without the addition of lubricating oil at higher clay contents, d ·. H. 20 percent by weight and above, there is a certain tendency to clump together. It is therefore preferred not to use more than 25 percent by weight of clay in the additional combination according to the invention to use.

Powders H, I and J were at 75 ° / »humidity stored for a period of 10 months and found to remain free flowing and the original Particle size retained. The additional combination was therefore not hygroscopic. Not that hygroscopic character of the coated clay and containing the NaNOi is important in view of this on the prevention of crystal growth over extended periods of time as the Opportunities for a small, highly dispersed appearance Reduce districts of oversaturated solutions. from which the crystal wax Uim. progress rapidly would. The example illustrates the invention.

example

The example shows that the incorporation of NaNOi in the tone the properties of NaNOi in does not adversely affect the organic liquids to which it is added. One analogous to one of the additional combinations A to 0.9

passes through
Test sieve 270
(Mesh size
0.053 mm)

10 to 30 microns

D or E to K (see the following table) produced additional combination of anhydrous clay and NaNOi as a corrosion inhibitor instead of the usual NaNOi to prevent corrosion Various commercially available soap-based or clay-based greases are used as a thickener. The clay-NaNOi additive combination was added immediately before or after grinding with the greases mixed. The resulting lubricating greases were tested using the "CRC glass jar corrosion test" checked for their corrosive effects.

In the "CRC Glass Jar Corrosion Test", a lot of the grease to be tested is used for lubrication of a carefully cleaned cone and roller bearing. The lubricated arrangement after immersion in water for 2 weeks in a glass vessel containing a small amount of water at 25 C and 100 ° 0 relative humidity stored. At the end of the test, the bearings are cleaned and checked for corrosion and rust. A A perfect bearing receives the rating 1. Beginning of corrosion or isolated stains rated as 2, stronger corrosion as 3. The test mimics the corrosion with lubricated grease After bearings that are stored under wet or damp conditions.

The corrosion properties of the greases as a result of the »CRC glass jar corrosion test« are indicated in the table below.

with sound thickened Schmicrfclt type - Drainage Dry __ Caleium soap base 0.50 0.75 Lithium soap base eruption grind Well Well Corrosion inhibitor _ .. Drainage no 0.25 0.75 no 3.3.3 1,1,1 Method of manufacture eruption bad Well Well bad no 0.7 - 1.1.1 1.3.1 - Lot. Weight percent bad ..Well- - CRC corrosion test .... 3.3.3 1.1.1 drainage valuation 0.25 Well 3.3.3

The above results show that amounts of 0.25 percent by weight of the additive combination from anhydrous clay and NaNOi. based on the total composition of the grease, one give excellent resistance to corrosion. Though larger amounts used 6s especially for the Caleium soap based grease. can be pointed out. that the corrosion attack was considerably less than without using the invention Additional combination established.

Claims (1)

Claim: Lubricating oil or grease containing an additional combination from a well-known oleophilic clay and NaNO '.