EP0412271A1 - Fluides hydrauliques - Google Patents

Fluides hydrauliques Download PDF

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Publication number
EP0412271A1
EP0412271A1 EP90112004A EP90112004A EP0412271A1 EP 0412271 A1 EP0412271 A1 EP 0412271A1 EP 90112004 A EP90112004 A EP 90112004A EP 90112004 A EP90112004 A EP 90112004A EP 0412271 A1 EP0412271 A1 EP 0412271A1
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EP
European Patent Office
Prior art keywords
weight
hydraulic fluids
alkyl
alkyl polyglycoside
fluids
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Application number
EP90112004A
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German (de)
English (en)
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EP0412271B1 (fr
Inventor
Dieter Dr. Balzer
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Huels AG
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Huels AG
Chemische Werke Huels AG
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    • C10N2050/01—Emulsions, colloids, or micelles

Definitions

  • the invention relates to flame-retardant hydraulic fluids that are environmentally compatible and have lubricating properties.
  • Hydraulic fluids based on mineral oils are particularly common. In the mining industry, however, flame-retardant hydraulic fluids are required for safety reasons. B. in Schrämm machines, tunnel boring machines, turbo couplings and hydraulic rams. Flame-retardant liquids are also preferred outside of mining wherever there are devastating fires when flammable media escape from the closed hydraulic system.
  • the current flame-retardant hydraulic fluids are, in particular, aqueous systems, either oil-in-water emulsions (HFA) or glycol-polyglycol-water mixtures (HFC).
  • HFA oil-in-water emulsions
  • HFC glycol-polyglycol-water mixtures
  • the main disadvantage of the o / w emulsions is that they are metastable systems, which can be particularly critical due to temperature fluctuations and electrolytes (DE-OS 35 08 946). If thickened systems are involved, such as the avoidance of leakage losses in the gap seals of pumps and valves or the build-up of lubricating films between rubbing solid surfaces, the polymers used here are usually not or only insufficiently stable under shear.
  • HFC fluids based on mono-, oligo- or polyglycols have, in addition to extensive flame resistance, the advantage of physiological harmlessness and ecological acceptance (P. Lehringer, Petroleum and Coal-Natural Gas-Petrochemicals 41, 230 (1988)), which is particularly advantageous for Mobile use is where hydraulic fluid leaks often seep into the ground.
  • the systems are also considered to be largely shear stable, but this is to be viewed critically in view of the fact that usually the polymers in particular make the greatest contribution to the overall viscosity of the liquid, because of their chemical structure they are most at risk of shear.
  • Another disadvantage of the current HFC liquids is that the proportion of active substance must be very high, even at a somewhat elevated temperature still have a minimum viscosity. Water contents ⁇ 50% are quite typical here (C. Rasp, Tribologie Schmtechnikstechn. 35, 185 (1988).
  • the additive packages for producing more favorable effects in lubrication and wear protection are very complex here.
  • the task was therefore to develop flame-retardant, environmentally compatible hydraulic fluids that are sufficiently viscous at low active ingredient concentrations and have a favorable lubricating effect.
  • the invention therefore relates to aqueous hydraulic fluids which are characterized in that they contain 5-30% by weight alkyl polyglycoside, 0 to 20% by weight surfactant additives, 0-10% by weight non-surfactant additives and water ad 100% by weight. %, the active ingredient content being a maximum of 40% by weight.
  • alkylpolyglycosides even at lower concentrations, alone or in the presence of other surfactants, have a particularly high level of viscosity with a very good lubricating effect.
  • the alkyl oligoglycosides used in accordance with the invention can be prepared entirely or partially on the basis of renewable raw materials by known processes. For example, dextrose is reacted with n-butanol to give butyl oligoglycoside mixtures in the presence of an acid catalyst, which are transglycosidated with long-chain alcohols in the presence of an acid catalyst to give the desired alkyl oliglycoside mixtures.
  • the formula of the products can be varied within certain limits.
  • the alkyl radical R ' is determined by the selection of the long-chain alcohol.
  • Favorable for economic reasons are the industrially accessible tenside alcohols with 8 to 20 carbon atoms, e.g. B. oxo alcohols, Ziegleralkohole and native alcohols from the hydrogenation of fatty acids or fatty acid derivatives.
  • the oligoglycosyl radical Z n is determined, on the one hand, by the selection of the carbohydrate and, on the other hand, by setting the average degree of oligomerization n. B. according to DE-OS 19 43 689.
  • polysaccharides, oligosaccharides and monosaccharides e.g. B. starch, maltodextrins, dextrose, galactose, mannose, xylose, etc. can be converted to alkyl oligoglycosides.
  • the industrially available carbohydrates starch, maltodextrins and dextrose are particularly preferred.
  • alkyl polyglycosides are always mixtures of oligomers, which in turn represent a mixture of different isomeric forms. They exist side by side with ⁇ - and ⁇ -glycosidic bonds in pyranose and furanose form. The links between two saccharide residues are also different.
  • the alkyl polyglycosides can also contain accompanying substances such as residual alcohols, monosaccharides, oligosaccharides and oligoalkyl polyglycosides.
  • cationic surfactants such as quaternary ammonium compounds as additives to alkyl polyglycosides in aqueous hydraulic fluids also have beneficial effects, e.g. B. a strong improvement in lubricating properties.
  • Suitable non-surfactant additives in the hydraulic fluids according to the invention are amines or alkanolamines as pH regulators or corrosion inhibitors; Sodium molybdate, boric acid amine ester, benzotrialzole or toluene triazole also as corrosion inhibitors; Morpholine or N-methylmolpholin as vapor phase inhibitors; Silicone defoamers or other defoamers; Glycol and / or glycol ether or urea as a solubilizer and optionally water-soluble polymers for correcting the temperature profile of the viscosity and preservatives.
  • the hydraulic fluid according to the invention is based on the alkylpolyglycosides, a toxicologically, unobjectionable surfactant class of excellent biodegradability (95 to 97% by weight coupled unit test, DOC). 3 to 30 wt .-%, preferably 5 to 25 wt .-%, alkyl polyglycoside are contained in the liquids according to the invention, the total active ingredient concentration at max. 40% by weight, preferably 35% by weight.
  • the pressure fluids according to the invention are usually clear in the temperature range between 5 and 80 ° C. or possibly slightly opalescent in the presence of silicone defoamers. They are usually weakly alkaline.
  • MARLON A linear C10C13 alkylbenzenesulfonate Na salt (Hüls AG)
  • MARLON (R) PS C13C17 paraffin sulfonate sodium salt Hüls AG
  • Polymekon (R) 730 silicone defoamer Goldschmidt AG
  • a 15 wt .-% solution of C12C13 alkyl polyglycoside (DP 1.7, determined via 1 H-NMR) in demineralized water was prepared.
  • the viscosity behavior of the solution (Haake RV 20 rotational viscometer, M 5, 50 ° C, shear range 30-300 sec ⁇ 1) is Newtonian and is approx. 150 mPa ⁇ s.
  • the clear point of the solution is 10 ° C. As the temperature rises (up to 80 °), the solution does not undergo any optical change.
  • a 10 wt .-% solution of C10-C14 alkyl polyglycoside (D.P. about 1.3) in demineralized water shows Newtonian flow behavior and has a viscosity of 70 mPa ⁇ s at 50 ° C.
  • the analysis of the wear behavior carried out analogously to Example 1 showed a weight loss of the test specimen of 15 mg.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Lubricants (AREA)
  • Detergent Compositions (AREA)
EP90112004A 1989-08-10 1990-06-25 Fluides hydrauliques Expired - Lifetime EP0412271B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3926397A DE3926397A1 (de) 1989-08-10 1989-08-10 Hydraulikfluessigkeiten
DE3926397 1989-08-10

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EP0412271A1 true EP0412271A1 (fr) 1991-02-13
EP0412271B1 EP0412271B1 (fr) 1993-08-11

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EP (1) EP0412271B1 (fr)
CA (1) CA2022914A1 (fr)
DE (2) DE3926397A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003066294A2 (fr) * 2002-02-07 2003-08-14 Lonza Ag Produits de protection du bois non aqueux

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2956951A (en) * 1956-10-26 1960-10-18 Exxon Research Engineering Co Water base lubricant containing dimethyl sulfoxide
GB1007467A (en) * 1961-10-03 1965-10-13 Brunel Henri Method for protecting metals against corrosion and water soluble products for performing this method and for lubrication
DE1943689A1 (de) * 1968-09-03 1970-03-12 Rohm & Haas Alkyl-Oigosaccharide und ihre Mischungen mit Alkyl-Glucosiden und Alkanolen
FR2360658A1 (fr) * 1976-08-04 1978-03-03 Singer & Hersch Industrial Dev Fluides industriels a base d'eau
GB2016041A (en) * 1978-02-07 1979-09-19 Sanyo Chemical Ind Ltd Non-inflammable hydraulic fluid

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2956951A (en) * 1956-10-26 1960-10-18 Exxon Research Engineering Co Water base lubricant containing dimethyl sulfoxide
GB1007467A (en) * 1961-10-03 1965-10-13 Brunel Henri Method for protecting metals against corrosion and water soluble products for performing this method and for lubrication
DE1943689A1 (de) * 1968-09-03 1970-03-12 Rohm & Haas Alkyl-Oigosaccharide und ihre Mischungen mit Alkyl-Glucosiden und Alkanolen
FR2360658A1 (fr) * 1976-08-04 1978-03-03 Singer & Hersch Industrial Dev Fluides industriels a base d'eau
GB2016041A (en) * 1978-02-07 1979-09-19 Sanyo Chemical Ind Ltd Non-inflammable hydraulic fluid

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003066294A2 (fr) * 2002-02-07 2003-08-14 Lonza Ag Produits de protection du bois non aqueux
WO2003066294A3 (fr) * 2002-02-07 2004-01-15 Lonza Ag Produits de protection du bois non aqueux

Also Published As

Publication number Publication date
EP0412271B1 (fr) 1993-08-11
CA2022914A1 (fr) 1991-02-11
DE59002288D1 (de) 1993-09-16
DE3926397A1 (de) 1991-02-14

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