DE1444926A1 - Process for the production of a complex lubricating grease - Google Patents

Description

Ysrfahren for the production of a complex ohmic grease The quality of the greases can by variation. or combination of the thickener can be improved by changing or codification of the liquid phase by production of Koatplexaolnierfetten or by use "of Scbmierfettzusätzen, the most successful technique, the manufacturing .Komplexsohmierfetten, which are characterized by significant meoha # nisohe stability and properties proved, wake possible ei n e wide application.

VJ »Definition of" complex "grease is not precisely limited, nevertheless complex greases can be divided into two main ones. gx-ugpen being classified.

'I. Fats, is combined a low molecular weight and a high molecular acid in the thickener (U.S. Patent 2,197,263) 2, fats that combine an ordinary soap thickener and Wetqllhydroxyde (eg. $. East German Patent 21,328). According to the invention, it was found that the combination of the above-mentioned thickeners produces a relatively better complete thickener, which is expressed in the better properties of the finished complex lubricating grease. The processing is carried out with different fatty raw materials, different mineral oils and with different amounts of Al (OH) 3. The complex lubricating greases are made according to generally known methods based on stearin oleini, hardened fish oil fatty acid and montanic acid, using paraffinic and non-paraffinic oils with a viscosity of 2 to 8 ° E / 50 ° 0, with glacial acetic acid as the low molecular weight acid and always with an addition of 0 , 3 to 3.0% Al (OH) 3. A1 (OH) 3 can be used in the form of hydrogel or in hard crystalline form together with Ga (OH) 2.

The complex lubricating greases according to the invention have better mechanical strength and a smoother texture than ordinary complex cream greases. The penetration values of two complex absorbing fats with and without Al (OH) 3 are given as an example Complex grease A B 25o0 80 ° C 25 0 C WC Penetration value 215 244 187 198 n. 60 strokes 262 292 209 224 "n. 500 @ # 285 305 209 230: "n. 1000 '@ 292 321 210 241 "n.5000" 308 335 217 256 8888 "n. 10000" 308 340 217 289 "n.15000" 314 350 218 286 after 24 hours of downtime 275 295 198 227 Oil separation, czecho $ lowa- kisohe norm 65 6313-100C 0.0 g% the oil separates - 'not off Oil separation, tscheoho8lowa- kisohe norm 65 6313-150C 3.0% " Al (OH) 3 content in% 0.0 195 The complex lubricating greases A and $ yv were produced in the following composition: hydrogenated pisahalfatty acid ..... 370 g E'i $ acetic acid .................. 78 g @ra (OH) , Z r ............. r ......... 105.5 g mineral oil ................... ... 1500 g Al (OH) 2 ..... (hydrogel) ....... 'I67 g , This comparison shows the hardening influence of Al (OH) 3 on the structure of the grease Appearance of the fat with Al (OH) 3 (Sc; umierfett-Textur) is much more favorable.

Since the penetration values are not very instructive at first glance, Another dimensionless parameter was introduced ..

After mechanical stress on the grease in the kneader in accordance with Czechoslovak standard 65 6307 for a maximum of 4 hours (corresponds to 15,000 working hours of the kneader), a penetration value was determined, designated P4. The original, incomplete complete 3x grease has a penetration value of PO .

With regard to the ability of the complex lubricant to work, its thixotropic regeneration is also important in operation, i.e. to what extent does the penetration value of the complex lubricant (fat consistency) return to the original penetration value after mechanical stress, if the complex lubricant has some Time locks (e.g. $. 24 hours). The penetration value determined in this way is referred to as P $. In the ideal case, ie if the penetration index does not change due to mechanical stress, @ is P4 / PO = 1; This also applies to the PR / PO ratio, ie the complex ohmic grease regenerates to the original penetration value after mechanical stress at a standstill. The product of the two ratios multiplied by 100 is called "PIgSR" (parameter of the mechanical stability and regenerative capacity of the complex lubricating grease ". This parameter clearly expresses the degree of mechanical stability of the complex lubricating grease Complex boiling fat can also be characterized in terms of mechanical stability at temperatures other than 25 ° C.

By checking large amounts of grease, we proved the validity and correctness of the parameters introduced, which can be seen from the following examples: 1. A continuously generated, non-complex lubricant with the values P4 m 350, PO 9 199 and PR = 312 ( at 80o0 has the PMSR-'vert: 350/199. 312/199. = 1.75. 1.56. 100 = 273. Similarly, the PMSR-'value of the same lubricating grease for ratios at 25o0 is calculated to be 229. -Both verte , far from the ideal: ten fourth 100, clearly show the poor properties of the lubricating grease tested with regard to its mechanical stability.

2. One of the series of complex lubricating greases that are currently produced, which is listed as complex scrunivr fat A in the table, shows the following P ;; netration values: at 25 0 0 s PO. 215, P4 # 314. PR m 275 .

at 8000 s P4 # .350, PR = 295.. By the aforementioned calculation PMSR value is obtained .5 / 2500 Us 221 / 80o0. .

36. Complete resistance grease 8 tends to have the following penetration value.

at 2500 8 P0 = 187, P4 # 218, PR 198 at 80o0 1 B4 # -186, PR a 227.

By calculating a PMSR value 1? 1/2500 cid 183/8000 is obtained.

The clarity of the Paramters is clearly ersehene from the following table Psramter continuously generated complex, complex Na-Pott lubricant grease A 8 F bei 2500, 229 185 121 P SS ß: at 8000 273 221 183 It is clear from the table that the complex lubricating grease according to the invention at 8000 is practically just as mechanically flexible as the complex lubricating grease A at 2500 regenerates the original structure better to the edge.

The PUSR can also be determined at other temperatures according to the assumed operating conditions. The values above 100 characterize thixotropic fats, whereas '' empties below 100 rheopectic fats .

Claims (1)

Pate s £ rüche 1. Process for the production of a complex fat , characterized by the combined use of a low molecular weight with a high molecular weight acid as well as an ordinary soap thickener and an addition of metal 'hydroxides to a complex uniocar, which is known with fat raw materials in known Way is processed to a 'complex fat, 2. Process according to claim 1, characterized in that on the basis of stearin, olein, hardened fish oil fatty acid and montanic acid with simultaneous use of praffinic and non-paraffinic oils with a viscosity preferably from 2 - 80H / 5000 below Addition of glacial acetic acid as a low molecular weight acid and with an addition of, for example, 0.3 to 3% Al (OH) 3 as a hydrogel or in crystalline form in a known manner to form a complex fat, the Al (OH) 3 together with calcium hydroxide appropriate proportion of the mineral oil is added. 3. Lubricating grease according to claim 1 and 2, characterized in that the saponifiable dispersion contains except-Ca (OH) 2 0.3-3.0 A1203 in the form of hydrogel, ¢. Lubricating grease according to claims 1 and 2, characterized in that the lubricating grease contains mineral oil with a viscosity of 2 - 8 ° E / 5000, advantageously 3 - goE / 500C. 5, lubricating grease according to claim 1 and 2, characterized in that the molar ratio of the low molecular weight and high molecular weight acids in the complex ohmic grease is 0.5 i 1 - ¢ 0 s 1, advantageously 1: 1 - 1 t 10. -6. Lubricating grease according to Claims 1 and 2, characterized in that the composite lubricating grease contains 15-35%, advantageously 18-28, 96% indioker.