DD216252A1 - LUBRICATING OIL TO PREVENT STICK SLIP - Google Patents

Abstract

The invention relates to a lubricating oil for preventing stick-slip for use in slideways, hydraulics, gearboxes and bearings. The lubricating oil consists of paraffinic Mineraloelkomponenten in Schmieroelviskositaet 0.5 to 5 Ma .-% of high molecular weight fatty acids chain length C deep 16 to C deep 18, 0.3 to 2.5 Ma .-% lead octoate, 1 to 6 Ma .-% EP Addition, 0.5 to 2.5% by weight of zinc dialkyldithiophosphate and 0.3 to 4% by weight of zinc dialkylaryl dithiophosphate. It has excellent anti-stick-slip performance combined with a low coefficient of friction and a favorable ratio between the coefficient of friction of rest and movement in the practical track material combinations used and for specific surface pressures of up to 1.5 MPa.

Description

The invention relates to a lubricating oil for preventing stick-slip for use in slideways, hydraulics, gearboxes and bearings.

Characteristic of the known technical solutions

It is known that stick-slip vibrations occur on sliding pairings when they are not separated from each other by a coherent lubricating film, they have an elastic degree of freedom and the friction coefficient of rest is greater than the coefficient of friction of the movement. Stick-slip-Schv / ingungen is undesirable, as they occur due to puncture disturbances on moving machine parts, the positioning accuracy of machines and the surface quality of workpieces is adversely affected and creates an additional stress on the drive elements.

Since constructive measures to prevent stickslip vibrations are narrow limits, the lubricant must ensure a continuous movement to prevent stick-slip ·.

· »2 -

Bs is known to impart properties to the lubricating oil by adding special additives that largely eliminate stick-slip. Thus, to prevent stick-slip, substantially metal salts of certain fatty acids, such as aluminum stearate, lead naphthenate and the like, are used. Ä. used. To achieve favorable load bearing properties, sulfides, chlorinated paraffins, organic phosphorus compounds such as tricresyl phosphate, metal dialkyl dithiophosphates and the like are known.

IQ '. ·? From DD-PS 63 835 a Gleitbahnöl is known that from a paraffinic lubricating oil with additions of Brightstock for viscosity regulation 0.5 to 5 % by weight of a Lead salt of oleic acid or linoleic acid, 1 to 5 mass% of zinc dialkyldithiophosphate, 1 to 10 mass% polymethacrylate and 0.1 to 3 mass% of a primary or secondary aliphatic amine of chain length G-jg to Gg or its salt with an unsaturated fatty acid and to a greater extent stick-slip prevents »- ..: .- ' ^: -' ..Λ ·. '

The known technical solutions have the "disadvantage that they improve the stick-slip behavior, but do not act to the extent that they prevent stick-slip · cause is that the friction coefficient of rest is greater than the coefficient of friction of the movement In addition, the solubility of suitable stick-slip inhibitors in mineral oils sets narrow limits of applicability, as a rule it is necessary to work with solubilizers. This leads to the premature discontinuation of the inhibitors and negatively influences the quality of the finished products.

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Object of the invention

The aim of the invention is to provide a lubricating oil to prevent stick-slip that prevents malfunction due to stickslip when used in machine tools, reduces wear and high

Positioning accuracy and surface quality allows · object of the invention

The object of the invention is to provide a lubricating oil for the prevention of stick-slip that excellent anti-stick-slip behavior associated with a low coefficient of friction and a favorable ratio between the friction coefficient of rest and the movement used in practice Guideway material combinations, such as GGl / GGL, GGL / St and GGL / plastic material and has medium specific surface pressures up to 1.5 MPa

 In addition, it should also be used for bearing and gear lubrication as well as hydraulic fluid · Other required properties, such as wear behavior, corrosion protection, aging stability u · ä · should not be adversely affected ·

20 features of the invention

It has surprisingly been found that a combination consisting of "paraffinic mineral oil components in lubricating oil viscosity, which are worked up by known process steps, such as distillation, dewaxing and / or hydroraffination and / or solvent refining and, if necessary, bleaching or hydrofinishing and 0.5 to 5 Ma» % of a mixture of higher molecular weight, unsaturated fatty acids of chain length 0- r to Cg, that of natural fatty acid

be obtained by fractional crystallization and optionally additional distillation,

0.3 to "2.5 % by mass of a lead salt of an alkanoic acid whose alkyl chain has a chain length of

preferably Cg has "1 to 6 Ma" -% of a reaction product, obtained from

unsaturated aliphatic alcohols of chain length C- ^ to O ^ by stepwise reaction with elemental sulfur, Phoaphorpentasulfid and primary and / or secondary alkylamines of chain length Cq

to C ₁₈ ,

0.5 to 2.5 Ma.7% of a zinc salt of a dialkyldithio

phosphoric acid having an alkyl chain length of Cg to C ^ g, preferably Cg and 0.3 to 4 Ma. -% of a zinc salt of a dialkylaryldithio «

phosphoric acid whose alkylaryl radicals are preferably nonylphenol,

A lubricating oil that prevents stick-slip freedom up to 1.5 PSa presses with certainty in the used in practice guideway material combinations, such as GGL / GGL, GGL / St and GGL / plastic materials and in which the friction coefficients of rest and the Exercise extremely low and have a favorable relationship to each other.

The good aging, EP and corrosion protection properties also allow for use in bearing and gear lubrication as well as hydraulic fluid · The additives can be introduced into the oil individually or in the form of stock solutions of any concentration at temperatures up to 60 ° (X ).

This result was surprising, since zinc dialkyldithiophosphate and lead salts of alkanoic acids have anti-stick-slip properties even as individual components in higher concentrations, but without being able to satisfy them. In particular, negative effects on the base oil, such as deterioration of the aging stability, remain Lead salt or deterioration of the behavior of air through the zinc salt.

embodiments

The invention will be explained in more detail below on some embodiments

example 1

Am mixture of dewaxing and bleached Hydroraffinatdestiilaten viscosity location s at 40 ⁰ C 68 mm / 2 Ma "-% of a mixture of higher molecular weight unsaturated fatty acids of chain length C-jg to Cj ₈ from natural fatty acids (Rofacid TD 90 - VEB DHW Rodleben) 1% by weight of lead octoate (Pb-Hovosik - Chemical Factory Taucha), 4.Ma .-% of a reaction product of unsaturated aliphatic alcohols of chain length Cj, - to 0 ₂ 2 * ³ ^ * elemental scale, phosphorus pentasulfide and primary and / or secondary alkylamines of chain length Cg to Cng (SPA 710 - VKB hydrogenation plant Zeitz), 2% by mass of a 50% oily solution of zinc dialkyldithiophosphate and 2.8 % by mass also of 50% oily solution of Zinkdialkylaryldithiophosphat added.

This gives a clear oil, which except stick-slip-freedom up to surface pressures of 1.5 MPa good aging stability, good corrosion protection and »a

25 has good load carrying capacity.

Example 2. -

The base oil mentioned in Example 1 is 2 Ma. % Rofacid T 90, 1 Ma,% Pb-Novosik, 4 Ea.-56 EPA 710, 1.2 Ma. % Zincdialkyldithiophosphate and 1'Ma.sup.- zincdialkyldithiophosphate.

This gives a clear, free from precipitation oil with good wear protection, good aging stability and good corrosion protection.

Example 3 *. '

A mixture of the viscosity layer 220 mm / s consisting of dewaxed and bleached hydroraffinates and a dewaxed and solvent-sensitized heavy oil is mixed with 2% by mass Rofacid TD 9O ₉ 1% by weight Pb-Novosik, 3% by weight EPA 710, 1.5% by weight of zinc dialkyldithiophosphate and 2% by weight of zinc dialkylaryl dithiophosphate were added. The obtained. Oil has Bick-slip-freedom at surface pressures above 1.75 ^ 2Pa and has a good EP-behavior, a good aging stability and a good corrosion protection.

The friction and stick-slip behavior of the oils according to Embodiment 1 to 3 was tested on a stick-slip test bench in the test area to 1.75 MPa surface pressure 'and with a belonging to the prior art slideway oil according to DD-PS 63rd 835 compared. On the stick-slip test bench glides a GGL 25 supersample mounted between two tension wires in a sample holder, on a low-speed, 100 Cr 6 sub-sample screwed onto a slide-guided slide * The upper sample is loaded by weights and pressed against the sub-sample. The frictional forces or frictional sliding occurring are measured via the tension wires

 The results of the test are shown in the table.

Product according to DD-PS

Example 1 Example 2 Example 3 53 835

free of stick-slip p MPa greater 1.75 greater 1.75 greater 1.75 to 0.7

Frictional behavior at 0.5 MPa

1.0 IPa

, 1.5 MPa

1.75 0.11

0.11

0.12

0.11

0.13

0.12

0.13

0.12

0.10

0.11

0.12

0.12

0.14

occurrence of stick-slip

occurrence of stick-slip

occurrence of stick-slip

Air separation capacity according to TGL 32 432

min

15

Aging according to TGL 17 745 Z-sludge Bed: 125 ⁰ C, 72 h, 5 1 air / h copper sheet '., · -'

0.1 / 0.12 0.09 / 0.14 0.11 / 0.13 0.32 / 0.34

Emulsifiability according to OJGL 0-51591 not not unexplored enulgating emulsifying imaginative

Claims (2)

Invention claims' · 1 · Lubricating oil to prevent stick-slip on the './'. Base of paraffinic mineral oil components in lubricating oil viscosity and lead salts of alkanoic acids and zinc dialkylditophosphate, characterized by »that the base oil 0.5 to 5 Ma "~% of a mixture of higher molecular weight, unsaturated fatty acids of chain length C ^" to C ^_8,! The mixtures of natural fatty acid ned by fraktio "crystallization and optionally additional Distillation ^{1 be} obtained
, 0.3 Ms 2.5 Ma .-% of a lead salt of Älkansäure whose alkyl chain has a chain length of preferably. Cq owns, 1 to 6 % by weight of a reaction product obtained from unsaturated aliphatic alcohols of chain length Cc to O ₂ O with elemental sulfur, phosphorus pentahydrate sulfide and primary and / or secondary alkylamines of chain length C ₈ to C ₁₈ , 0.5 to 2.5 Ma .- ^ of a zinc salt of a dialkyldithiophosphoric acid with alkyl chains in the range of C ^ to C-ig »0.3 to 4 Ma. -% of a zinc salt of a Dialkylaryldithiophosphorsäure whose alkylaryl radicals are preferably Honylphenylreste contains. 2. Lubricating oil according to item 1, characterized in that the base oil 2% by mass of the higher molecular weight, unsaturated fatty acids of the chain length O 1 to O ₈ , 1% by mass - 31eiok '± oat,' 3 to 4% by weight of the reaction product of unsaturated aliphatic alcohols with sulfur, phosphorus pentasulfide and amides, 1.2 to 2% by weight of zinc dialkyldithiophosphate in the form of a 50% oily solution and
1.0 to 2.8 Ma * -% Zinkdinonylphenyldithiöphosphat contains.