DE1444780B - - Google Patents

Description

1 2

The lubrication of pneumatic tools, in particular, exert lower temperatures than this This is particularly the case with drilling tools or similar work when using mineral oils. this testify for rock drilling, takes place in such a way that this is achieved, among other things, by the fact that the diester compressed air acting on the tool, as substances of a more uniform character, stable fluids the lubricating oil have properties down to the pour point under such conditions, Movement comes that part of the lubricating oil, which is responsible for underfreezing and increases in the viscosity Lubrication is sufficient, in the form of fine droplets could be avoided. By taking advantage of the abin suspended in the air stream. The oil is determined by the viscosity of the diester from the Temden Air flow to the moving parts of the air pressure temperature it is possible to adjust the range of viscosity The tools that are to be lubricated are limited to the extent to which the external elements lead. The temperature fluctuations also occur on the moving parts as the oil flows, so that this BeExpansion the compressed air while working. richly coincides with the range of viscosity, During the expansion, the air temperature drops sharply - which is suitable for the tool used. According to cooled, and thus the oil also cools down. One of the invention are therefore lubricating oils for lubrication It is important to use a lubricating oil for air pressure tools 15 which contain one or more such esters. The requirement to be made is therefore a lower cloudiness. It has been found that the ester content of the lubricant and pour point and associated therewith an oil usually at least 25%, preferably 35%> high viscosity index of the oil. These requirements should be.

On the other hand, it has been found that the ester content is used. Since the mineral oils a 20 should not be too high for various reasons. Mixture of hydrocarbons, it is difficult to combine all these properties in one oil when atomizing pure esters or lubricants. agents with a high content of esters with air. This is due to the fact that drops of hydrocarbons are easily formed, the extent of which is uniform. Experiments with 25 However, when the esters are diluted with a mineral oil with ge-lubricating oils made from pure mineral oils but having suitable properties, it turns out that the ideal range for the viscosity of a suspension lubricating oil for spraying the mixture with air is established Pneumatic tools considerably narrower sion of drops, the sizes of which differ more, than that in which the oil viscosity moves, that they settle more easily on the places to be lubricated because of the changes in the atmosphere. The lubricating oil according to the invention contains temperature. Such oils have also, as has been established - therefore no more than 80% - preferably no more, regarded as lubricating oil, certain as 70% esters of the type mentioned.
negative traits. As a diester of a dibasic acid with 6 to 6, these are due to the fact that the mineral oil has stable flowable carbon atoms, especially properties within the temperature range of the 35 diesters of adipic acid, pimelic acid, azelaic acid, which can be used in air pressure tools, are absent. Sebacic acid and pinic acid (3-carboxy-2,2-dimethyl-This can be due to an overcooling of the oil and a cyclobutane acetic acid). With the exception of the pinic acid, which has a sudden increase in viscosity due to which it is a cycloaliphatic acid, there are dibasic precipitates of certain hydrocarbons, see aliphatic acids, all of which are straight, saturated ones that occur in the mineral oil, e.g. B. paraffins, have 40 carbon chain. The most suitable esters can be attributed to this. It is evident that the acidic acids are alkyl esters. According to the invention, precipitated hydrocarbons can have straight or branched chains for the impaired alkanols, lubrication and other inconveniences that occur - and the number of carbon atoms is said to be responsible for the number 5. exceed. Suitable esters are e.g. B. the esters of

The use of esters in the alcoholic 45 acids already mentioned with the various

see component no free hydroxyl groups ent- hexanols, such as n-hexanol and 2-propylpropanol- (l),

hold and through esterification of aliphatic dicarbons the various heptanols, such as n-heptanol, hepta-

acids on the one hand with monovalent primary aliphatic- nol- (3) and 5-methyl-hexanol- (3), the different

see alcohols on the other hand with aliphatic Aiko-octanols, such as 2-ethylhexanol- (l) and iso-octanol, the

with at least 5 carbon atoms, the two 50 nonyl alcohols, such as n-nonanol, the decyl alcohols,

or more primary, but no secondary or ter- such as n-decanol, the undecanols, such as n-undecanol, and

tiary alcohol groups are available, including higher alcohols.

alone or in admixture with other than lubricants. The lubricating oils according to the invention can be one

suitable esters, optionally also containing natural or more hydrophobic substances, such as. B.

or synthetic hydrocarbon oils, as lubricating lecithin. The addition of these substances, which add up to 1%

oils are known from German patent specification 767 240. but should not usually exceed 0.5%,

However, these lubricating oils allow only a limited - the purpose is to protect the metal surfaces of the compressed air

th use and are not suitable for all purposes. to provide tools with hydrophobic coatings.

It has now been found that diesters of dibasic ice crystals, which are formed during the expansion of the compressed air

look aliphatic and - but in a slightly lower 60 form, this prevents them from being reflected on the

Degree - to deposit even cycloaliphatic carboxylic acids with surfaces, so that the risk of

6 to 10 carbon atoms - substances that are reduced in chemical stuffing of the tool.

Relationship are more uniform, in which the opacity- that with the dibasic diesters for the purpose of

and pour points are closer together and in the position of the lubricating oils according to the invention to minimize

special case when they see air tools 65 mineral oil is said to have a high frost resistance

be used, coincide with each other - have a quality. In particular, spindle oil with a

far better lubricating effect on the moving pour point below -30 ⁰ C, preferably below -40 ⁰ C,

Parts of the compressed air tools for those with a viscosity of at least 35 cSt, preferred

Claims (4)

3 4 at least 40 cSt, at 200C it can be used advantageously. Accordingly, it should be a. . wrestle contain paraffins. The difference in specific gravity at 200C 0.904 between the cloud point and pour point should preferably not exceed the viscosity at 50oC cSt 9.67-10 ° C. 5 Viscosity at 37.8 ° C cSt 14.2 The lubricating oils according to the invention can also viscosity at 98 9 ° C cSt 3 45 contain other additives such as. B. Means for viscosity index '. '.'. '.'. '.'. '.'. '.'. '.'. '. 138 * Improvement of the viscosity index, extreme pressure. . agents, inhibitors of various types and agents for the flow point in degrees Celsius -57 lowering of the cloud point and / or flow point. io water content (Karl - Fischer) ... 0.29 The lubricating oils according to the invention for air pressure tools on the basis of a mixture of a di- The lubricant was in a compressed air work ester oil and a mineral oil are therefore, as can be seen from the tool tested under the standardized conditions, It has been found that it distinguishes all others for the fact that they are made of a combination of oils for the same purpose on the market ^. . .,. is far superior. 1. one or more diesters from a two-base between aliphatic and / or cycloaliphatic Carboxylic acid with 6 to 10 carbon atoms and a monohydric aliphatic alcohol with more than _M claim: 5 carbon atoms in an amount from 25 to 80 percent by volume with lubricating oils for pneumatic tools on the 2. a pour point below -3O ⁰ C and a _{mixture of a ßasis} ^ i _{Diesterö and} viscosity of at least 35 cSt at 20 C up _ejnem dadurchgekennzeichweisenden _{mineral oil} mineral oil, spindle oil, in particular, Ge _{n on that it emer combination}
possibly with 3. an addition of a surfactant hydopho- j _e j _nes or more diesters of a zweibasiben agent and see optionally substituted with aliphatic and / or cycloaliphatic 4. Common additives see carboxylic acid containing 6 to 10 carbon. 30 atoms and one monovalent aliphatic The now following embodiment serves the same alcohol with over 5 carbon atoms in if the more detailed explanation of the invention against an amount of 25 to 80 percent by volume with State. 2. One has a pour point below -30 ° C and one Example viscosity of at least 35 cSt at 20 ⁰ C on- 35 pointing mineral oil, especially spindle oil An air pressure tool lubricant was included as an option by mixing 3. _e j _ne m addition of a surface-active hydro- Spindle oil 50 percent by volume P ^{raised by means and,} if necessary, with Di- (2-ethylhexyl) sebazinate ... 50 percent by volume ^ 4. common additives manufactured. exist.