DE1812799A1 - High-performance lubricating oils - Google Patents

Description

O O CO OO

In order to cope with the ever increasing demands (thermal stability, viscosity, cold resistance, oxidation resistance, high flash point, freedom from corrosion, protection of the sealing materials), you have to adapt them to different, auxiliaries that favorably influence certain properties or add additives, inter alia as inhibitors, additives, thickeners, detergents or dispersants are known. Not just the actual "thickening agents" (polymers such as polyisobutylenes), so named because of their properties or polyacrylates), but also some other such enhancing agents not only cause an increase in viscosity, but also often impair the viscosity developed by the mineral oil itself and properties required of it.

It has now been found that these disruptive effects of the aids can be avoided Eliminate or largely render ineffective, if you add viscosity-increasing additives containing lubricating oils an amount by weight of higher molecular weight, oily bifunctional ester approximately corresponding to the content of these additives.

Such esters are to be understood as meaning those which are composed of divalent Alcohols and monobasic acids, or from dibasic acids and monohydric alcohols are built up in such a way that they contain between 25 and 45 carbon atoms. They are said to be oily at ordinary temperature.

The presence of the ester surprisingly not only results an extensive or complete elimination of the negative influences

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the - for other reasons necessary - improvement and · Auxiliary materials, but they develop properties in the finished lubricating oil, which in many cases mean a real improvement. In some cases, these beneficial effects allow one can also use such additives in practice, which are used for the improvement of one of the other property, e.g. cold behavior or thermal and oxidation resistance, would enable their application, however fails because of the disadvantages inherent in these means.

Example:

Change of key figures from

1.) Mineral oil, engine oil additive and pour point

better mixed,

2.) Mineral oil, engine oil additive, pour point improvement

serer and 5% by weight of polymers (3% polyacrylate, 2% polyisobutylenes) mixed in.

3.) Mineral oil, engine oil additive, pour point improvement

serer, 5% by weight of polymers and 5% by weight of bifunctional esters admixed.

mixture

Viscosity (cSt) 210 ° F 8.04 12.9 12.45 Viscosity index 105 125 129 Pour point ( ⁰ C) -28 -34 -39 Flash point ( ⁰ C) 234 228 245 Viscosity according to Brookfield (cSt) at 0 ⁰ F. 7000 8800 6600 at -25 ° C 39000 36000 21000 at -30 ⁰ C 100,000 100,000 82000

The bifunctional ester mentioned in 3.) is the ester of trimethyladipic acid di-n-octyl-n-decyl ester.

009825/1703

Claims (1)

Claim Lubricating oils with a content of viscosity-increasing improvers, characterized in that they contain an approximately corresponding weight amount of higher molecular weight, contain oily bi-functional esters. 009825/1703 ORIGINAL INSPECTED