DE2257638A1 - GREASES - Google Patents

Description

JMe; Invention 'relates to lubricating greases which are thickened with polymers, in particular _m ±% polyolefins.

It is known to use lubricating oils using certain polyethylenes either alone or in combination with other thickeners, e.g. alkali metal soaps, to cover, like ' for example described in British patent specification 986 I92 »

It has been found that greases thickened with polyethylene have a "grainy" structure that is very difficult to get into smooth grease is to convert, and that better sehmier fats by using a mixture of olefin polymer seeds can be formed *

The subject of the invention are Sehmier fats, which consist of a lyiineral lubricating oil or a synthetic lubricating oil or mixtures of mineral lubricating oils and synthetic oils habenj, which are made with mixtures of a polyethylene and a atactic polypropylene with a Sohmeltindex over 20 zi | the consistency of the Sehmier fat are thickened *.

As. Polyethylenes are preferably used Pöjl _f yathyl.ene of high density, e.g. with a density of 0 * 9.4 g / cm ₄ ·

309823/0942

For the production of lubricating greases with a lower polymer content the polymers with a higher MoJekuJar weight preferred. The polymers with lower molecular weight however, form lubricating greases with a smoother structure or lubricating greases, which are easier to smooth out, so that the choice of Polymerisats normally of the intended use depends on the grease. For general purpose greases, e.g. Lubricating greases for the lubrication of closed gears, however, a lower polymer content is preferred. Suitable Polyethylenes are under the name "Rigidex" im I get trade.

The melt index of the polypropylene is preferably above 50. In atactic polypropylene is the amount of isotactic Polypropylene preferably under $ 10. The melt index des. Polypropylene can be tested according to the test method BS 2782, Method 105 C, or ASTM D. J £ JB can be determined. The molecular weight of the polypropylene is preferably below

000.

The polyethylene preferably has a molecular weight (weight average ) from 20,000 to 500,000, in particular 50,000 up to 250,000. The total weight of polymer in the Sehmier fat is preferably $ 1 to $ 20, especially $ 3 to $ 3 on the total weight of the lubricating grease.

The weight ratio of atactisohem polypropylene to polyethylene is preferably in the range from 1: 1 to 30: 1, in particular in the range ypft 2; 1 to 5 ; 1 _%

The lubricating greases according to MJ | of the invention preferably have a penetration above 3QÖ *, in particular a penetration of 310 to 500t. The penetration of the lubricating greases can according to ASTM 21.7-68 ge _; m, esiK $ ß throw «

BATH ORIGINM

Example '■ "

Greases were prepared from two different lubricating oil base oil s prepared as follows: half of the total amount of the oil's and the polyethylene was heated to 100 ⁰ C. Then, the atactic polypropylene was added slowly while heating to 150 C. · Die'Charge one hour at 150 ⁰ C was maintained so that the polymers swell and allowed to partially dissolve. The batch was heated to 180 ° C. and held at this temperature for at least 50 minutes, the polymers being completely dissolved. The remainder of the lubricating oil was added and the batch was cooled as quickly as possible to form the lubricating grease. The grease was circulated at 80 ° through a homogenizer and thereby smoothed.

In Tables 1 and 2 the starting materials are given, those for the production of those mentioned in Table 3 Lubricating greases have been used. 'Table. 4 shows the influence ' the melt index on the grease structure.

In the tables, "smooth" means substantially homogeneous SchmJ3 * fat with a smooth consistency. "Grainy" means the presence of grains or particles in the grease, and by "rubbery" is meant a structure that is tougher and spongy or more elastic than that well-known "buttery" structure of most greases. Furthermore, when a part of such a grease is removed the main mass of threads is formed which are still connected to the main mass of the grease and are elastic Have properties.

309823/0942

- ■■ ' ■ "■ BAD ORiGIWAL

_ 4 T a b e]] e 3

Characteristic number of the polymers

Polymer Type Commercial Quail Melt Density Molecular

denotes index g / ml weight

Polypropylene B-, 0-20 0-20 0.87 9-000 / 10,000

20-50 20-50 0.87 .IiK ^ SU

<50 <c50 0.87 about 6%

Polyethylene II Rigidex XGR 569 - 0.96 3 50,000

III ". Type 9 0.9 0.96 88,000

IV "type 50 5 0.96 70,000

Melt index: BS 2782, method I050 for polyethylene;
ASTM D I238 for polypropylene at 1,9O ⁰ C
Molecular Weight: Intrinsic Viseosity Method
Density: BS 2782, Method 509A

Table 2 Key figure of the lubricating oils

oil Kinematic toughness. cS viscosity index yj , 8 ⁰ C 60 ⁰ C 99 ° C

Y IO77 242.6 41.33 76

Z 137.2 40.49 10.27 43

309823/0942

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Key figure en atak from Lubricating greases Weight% Total- from atactic pene Po3ypropy3.en B, (Schme3 zindex ^ 50) Remarks - ' fat Ul- table Po3: po3y- Po3y- tra structure Fat can be smoothed designate Type Po3y- ethy3en meri- propy- tion I still. ^the tion propy- Type sate 3 en / Po3y- 3 light rubber items 3 en (B) 0.80 Weight % ethy3 en- Fat can be with some % By weight : Proportional 433 ^ 'Difficulty equaled
will 4.20 0.75 5.00 nis Ί Fat can be cooked 4/3 663 Y II 0.80 5.25: 3 443 3 light grain, -3 light I will 1 'fat 3 can be 3 calibrated
I smooth '■'
> ro 3.93 0.80 4.68, 442 rubbery J3 slightly rubbery 4/3 663Ä 4.20 II 0.75 5.00 5.25: 3 436 " dito · Fat can be cooked 4/3 663 Y 4.20 III 3.98 5.00 5.25: 3 ■ 445 3 slightly grainy 1 den 4/3 660 Y 3.93 IV • 3.48 4.68 5.25: 3 - 403 Ί g3att 4/3 66OA ^Γ 9.98 IV 3, 3 6 33.96 5.25: 3 43 0 I. K3att 3/3 739 ^r z .7. * 43 II 3 ^, 75 8.93. 5: 3. 473 I. grainy, 4/3 668 5.83 II ' 3.53 6.97 5: 3- 372 slightly rubber .4 / 3 668A 8.75 II 3.43 3 0.50 5: 3 43 3 good 4/3 669 Z , 7.66 III 3.98 9.39 5: 3 443 g3att 4/3 669A 7, π III 0.75 8.60 5: 3 ' 420 g3 att 4/3 669B 30.03 III 3.67 3 3.99 5: 3 ■ 433 g3att 3/3753 Z 8.75 IV 3.33 30.50 5: 3 '403 3 slightly grainy 4/3 667 7.53 IV 3 3.00 5: 3 422 · ■ t! ! t 3/3 778 6.67 IV 30.00 2: 3 tt ■ "· tt, 3/3 769 IV 2: 3 ' ti It

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■ 4/3 634A OJ- Z Atactic Influence the melt index structure tration grainy, rubbery Remarks I. extremely difficult description 4/3 635 Type Tvn Po3.ypropy3 en Wa3k- . dito 0>
I. fat to be smoothed of the lubricant Schme3 zin- B pene- 373 3 slightly grainy, fat 4/3 454 dex area Weight % 436 rubbery • Fat goes with * Y 0-20 436 slightly rubbery ■, (very difficult to some difficult 4/3 629 0-20 5.50 dito ^ smoothing fat smoothing out. 4/3 629A 20-50 4.40 443 very grainy, Fat can be smoothed out 4/3 630 5.50 438 rubbery will Fat can be iv > 50 173 dito smooth lsi 4/3 633 > 50 5.50 3 slightly grainy, cn 4/3 657 0-20 7.20 364 rubbery CD 4/3 633 ^ 15.00- 398 CO 0-20 dito 4/3 633A 20-50 9.40 3 slightly rubbery 4/3 634 3 5.00 440 420 ; dito , 20-50 > 50 11.30 428 15.00 ''> 50 ■ - 12.00

Claims (1)

Claims c h e 1) Lubricating greases made from an O] ef inpo] ymer isate thickened Lubricating oil base], characterized in that it is listed as 0] efinpo] Ymerisate a mixture of an atactic polypropylene with a melt index over 20 and a polyethylene one Density of more than 0.9 ^ g / cnr, the weight ratio of atactic polypropy] en to polyethylene 1:] 'to 30: 1. 2) lubricating greases according to claim 1, characterized by a Penetration from 510 to 500.. 5) lubricating greases according to claim] or 2, characterized in that 'That atactic polypropylene has a melt index greater than 50 and a molecular weight less than Has 100,000. . 309823/0942