EP3974500A1 - Lubrifiant de refroidissement - Google Patents

Lubrifiant de refroidissement Download PDF

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Publication number
EP3974500A1
EP3974500A1 EP21198607.0A EP21198607A EP3974500A1 EP 3974500 A1 EP3974500 A1 EP 3974500A1 EP 21198607 A EP21198607 A EP 21198607A EP 3974500 A1 EP3974500 A1 EP 3974500A1
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EP
European Patent Office
Prior art keywords
cooling lubricant
milliliters
water
propylene glycol
ethylene glycol
Prior art date
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Granted
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EP21198607.0A
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German (de)
English (en)
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EP3974500C0 (fr
EP3974500B1 (fr
Inventor
Nicola Ducoli
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Individual
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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M173/00—Lubricating compositions containing more than 10% water
    • C10M173/02—Lubricating compositions containing more than 10% water not containing mineral or fatty oils
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/02—Hydroxy compounds
    • C10M2207/021—Hydroxy compounds having hydroxy groups bound to acyclic or cycloaliphatic carbon atoms
    • C10M2207/022—Hydroxy compounds having hydroxy groups bound to acyclic or cycloaliphatic carbon atoms containing at least two hydroxy groups
    • C10M2207/0225—Hydroxy compounds having hydroxy groups bound to acyclic or cycloaliphatic carbon atoms containing at least two hydroxy groups used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
    • C10M2209/02—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/08—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to a carboxyl radical, e.g. acrylate type
    • C10M2209/084—Acrylate; Methacrylate
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
    • C10M2209/12—Polysaccharides, e.g. cellulose, biopolymers
    • C10M2209/126—Polysaccharides, e.g. cellulose, biopolymers used as thickening agents
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/06—Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/20—Metal working
    • C10N2040/22—Metal working with essential removal of material, e.g. cutting, grinding or drilling
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/20—Metal working
    • C10N2040/243—Cold working
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/20—Metal working
    • C10N2040/244—Metal working of specific metals
    • C10N2040/246—Iron or steel
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2050/00—Form in which the lubricant is applied to the material being lubricated
    • C10N2050/10—Semi-solids; greasy

Definitions

  • the present invention relates to the use of a cooling lubricant according to claim 1.
  • Cooling lubricants are often used in the machining of workpieces. Examples of the machining of workpieces are drilling, cutting, turning, milling, grinding, etc.
  • One of the tasks of the cooling lubricant is to reduce the friction between the tool and the workpiece and to dissipate the heat generated.
  • cooling lubricants Different types are known from the prior art. For example, a distinction is made between aqueous cooling lubricants and oil-based cooling lubricants. While the known aqueous cooling lubricants generally provide good heat dissipation, their lubricating effect is often limited. In comparison, the oil-based cooling lubricants have a better lubricating effect, but the low heat capacity of the oils leads to a limited cooling effect.
  • a cooling lubricant is to be specified which brings about good heat dissipation or friction reduction and at the same time is well tolerated.
  • a cooling lubricant for heat dissipation and / or reducing friction between a tool, in particular a drill, and a workpiece is specified, the cooling lubricant i) an aqueous solution and ii) a or more polyols and/or one or more polymers of one or more polyols.
  • the workpiece preferably comprises any building material such as stone, wood, concrete, plaster, brick, ceramic, metal, clay, plastic.
  • building material such as stone, wood, concrete, plaster, brick, ceramic, metal, clay, plastic.
  • other workpieces are also conceivable.
  • the cooling lubricant can comprise only one polyol or several polyols. It is just as conceivable that the cooling lubricant can comprise only one polymer from a polyol or two or more polymers from a polyol. It is also conceivable that the cooling lubricant can comprise one or more polyols and one or more polymers of a polyol. In the case of two or more polyols or two or more polymers of one polyol, these are preferably different polyols or different polymers.
  • the cooling lubricant is preferably in the form of a gel.
  • the gel-like cutting fluid is particularly advantageous for applications in difficult conditions, such as drilling vertical holes in ceilings or drilling in sensitive areas such as shop windows.
  • the gel-like property of the cooling lubricant prevents the cooling lubricant from flowing away and instead ensures that the cooling lubricant remains on the workpiece.
  • the cooling lubricant preferably further comprises at least one rheology modifier.
  • the rheology modifier comprises or is at least one acrylic acid and/or a polymer of an acrylic acid and/or at least one polysaccharide and/or at least one hydrocolloid.
  • the rheology modifier comprises or is a carbomer and/or xanthan and/or carrageenan and/or a galactose polymer such as agar agar.
  • Carbomers are high molecular weight polymers of acrylic acid that are crosslinked with polyalkene ethers of sugars or polyalcohols.
  • carbomer is an international non-proprietary name INN.
  • a preferred carbomer is a Carbopol® 940 polymer.
  • the at least one rheology modifier is therefore preferably at least one gelling agent and/or at least one thickener.
  • a concentration of the rheology modifier is preferably between 0.25% (weight/volume) and 4.5% (weight/volume), particularly preferably between 0.5% (weight/volume) and 4.0% (weight/volume). Additionally or alternatively, a preferred concentration of the rheology modifier is at least 0.25% (weight/volume), in particular at least 0.5% (weight/volume).
  • the specified concentration of the rheology modifier relates to a total quantity of the rheology modifier in relation to a total volume of the cooling lubricant.
  • the total amount of the rheology modifier is preferably in grams and the total volume is preferably in milliliters specified. If, for example, 1 gram of rheology modifier is added to a cooling lubricant consisting of 100 milliliters of a first polyol, 50 milliliters of a second polyol and 50 milliliters of an aqueous solution, the concentration of the rheology modifier is 0.5% (weight/volume).
  • the at least one polyol is preferably at least one dialcohol.
  • Preferred dialcohols are alkanediols.
  • the at least one polyol is ethylene glycol and/or propylene glycol.
  • the at least one polyol is therefore preferably at least one glycol.
  • a conceivable polymer of the glycol is polyglycol.
  • Preferred polymers of the polyols are thus preferably polyethylene glycol and polypropylene glycol.
  • the at least one polyol is preferably mono-ethylene glycol or mono-propylene glycol and polymers thereof, preferably polyethylene glycol or polypropylene glycol.
  • the cooling lubricant can comprise mono-ethylene glycol, or the cooling lubricant can comprise mono-propylene glycol, or the cooling lubricant can comprise polyethylene glycol, or the cooling lubricant can comprise polypropylene glycol. Mixtures thereof are also particularly preferred, e.g.
  • a cooling lubricant comprising mono-ethylene glycol and one or more polypropylene glycols, or a cooling lubricant comprising mono-propylene glycol and one or more polyethylene glycols, or a cooling lubricant comprising one or more polyethylene glycols and one or more polypropylene glycols.
  • polymers of the polyol preferably have essentially the same average molecular weight.
  • Particularly preferred polymers of the polyols are polypropylene glycol PPG 400 and Macrogolum 400. It is also preferred if there is more ethylene-based polyol than propylene-based polyol in a mixture. Polyol mixtures comprising ethylene-based polyol and propylene-based polyol in a ratio of 2:1 are preferred.
  • the aqueous solution preferably comprises or consists of water, in particular demineralized water.
  • the cooling lubricant can further comprise at least one basic compound.
  • the at least one basic compound is preferably a hydroxide of an alkali metal or an alkaline earth metal, most preferably sodium hydroxide.
  • the at least one basic compound is preferably present in dissolved form.
  • the at least one basic compound is particularly preferably dissolved in the aqueous solution.
  • the pH of the cooling lubricant is preferably between 5 and 8, in particular between 6 and 7.
  • a density of the cooling lubricant is preferably between 0.75 g/cm 3 and 1.5 g/cm 3 , in particular between 1.08 g/cm 3 and 1.12 g/cm 3 , and particularly preferably 1.10 g/cm 3 .
  • the densities mentioned were each determined at a temperature of 24.degree. The temperature was measured with a Bentech GM900 thermometer.
  • a density of 1.10 g/cm3 at a temperature of 24°C is obtained, for example, by 100 grams of ethylene glycol, 50 grams of propylene glycol, 50 grams of water, and 4 grams of Carbopol® 940 polymer.
  • the cooling lubricant preferably comprises ethylene glycol and propylene glycol, with a volume ratio of ethylene glycol to propylene glycol being between 10:0.1 to 0.1:10, preferably between 5:0.5 to 0.5:5 and particularly preferably between 2:0.75 to 0.75:2.
  • a volume ratio of ethylene glycol to propylene glycol of 0.75:1 is preferred, provided for example by 75 milliliters of ethylene glycol and 100 milliliters of propylene glycol. More preferred is a volume ratio of ethylene glycol to propylene glycol of 1:1, provided for example by 100 milliliters of ethylene glycol and 100 milliliters of propylene glycol. More preferred is a volume ratio of ethylene glycol to propylene glycol of 1:0.75, provided for example by 100 milliliters of ethylene glycol and 75 milliliters of propylene glycol. More preferred is a volume ratio of ethylene glycol to propylene glycol of 2:1, provided for example by 100 milliliters of ethylene glycol and 50 milliliters of propylene glycol.
  • the cooling lubricant preferably comprises ethylene glycol and water, with a volume ratio of ethylene glycol to water being between 2:0.1 to 1:0.5, preferably between 1:0.25 to 1:1.
  • the cooling lubricant preferably comprises propylene glycol and water, with a volume ratio of propylene glycol to water being between 2:0.1 to 0.5:1, preferably between 1:0.25 to 0.75:1.
  • a volume ratio of ethylene glycol to water of 1:1 is preferred, for example provided by 100 milliliters of ethylene glycol and 100 milliliters of water. More preferred is a volume ratio of ethylene glycol to water of 1:0.75, provided for example by 100 milliliters of ethylene glycol and 75 milliliters of water. More preferred is a volume ratio of ethylene glycol to water of 1:0.5, provided for example by 100 milliliters of ethylene glycol and 50 milliliters of water. More preferred is a volume ratio of ethylene glycol to water of 1:0.25, provided for example by 100 milliliters of ethylene glycol and 25 milliliters of water.
  • a volume ratio of propylene glycol to water of 1:1 is preferred. More preferred is a volume ratio of propylene glycol to water of 1:0.75, provided for example by 100 milliliters of propylene glycol and 75 milliliters of water. More preferred is a volume ratio of propylene glycol to water of 1:0.5, provided for example by 100 milliliters of propylene glycol and 50 milliliters of water. More preferred is a volume ratio of propylene glycol to water of 1:0.25, provided for example by 100 milliliters of propylene glycol and 25 milliliters of water.
  • volume ratio of propylene glycol to water of 0.75:1 provided for example by 75 milliliters of propylene glycol and 100 milliliters of water. More preferred is a volume ratio of propylene glycol to water of 0.75:0.5, provided for example by 75 milliliters of propylene glycol and 50 milliliters of water. More preferred is a volume ratio of propylene glycol to water of 0.75:0.25, provided for example by 75 milliliters of propylene glycol and 25 milliliters of water.
  • cooling lubricant comprises ethylene glycol, propylene glycol and water
  • a preferred volume ratio of ethylene glycol to propylene glycol to water is 1:1:1, provided for example by 100 milliliters of ethylene glycol, 100 milliliters of propylene glycol, and 100 milliliters of water.
  • a volume ratio of ethylene glycol to propylene glycol to water of 1:1:0.75 is more preferred, for example provided by 100 milliliters of ethylene glycol, 100 milliliters of propylene glycol, and 75 milliliters of water.
  • a volume ratio of ethylene glycol to propylene glycol to water of 1:1:0.5 is more preferred, for example provided by 100 milliliters of ethylene glycol, 100 milliliters of propylene glycol, and 50 milliliters of water. More preferred is a volume ratio of ethylene glycol to propylene glycol to water of 1:1:0.25, provided for example by 100 milliliters of ethylene glycol, 100 milliliters of propylene glycol, and 25 milliliters of water. More preferred is a volume ratio of ethylene glycol to propylene glycol to water of 1:0.75:1, provided for example by 100 milliliters of ethylene glycol, 75 milliliters of propylene glycol, and 100 milliliters of water.
  • More preferred is a volume ratio of ethylene glycol to propylene glycol to water of 1:0.75:0.75, provided for example by 100 milliliters of ethylene glycol, 75 milliliters of propylene glycol, and 75 milliliters of water. More preferred is a volume ratio of ethylene glycol to propylene glycol to water of 1:0.75:0.5, provided for example by 100 milliliters of ethylene glycol, 75 milliliters of propylene glycol, and 50 milliliters of water. More preferred is a volume ratio of ethylene glycol to propylene glycol to water of 1:0.75:0.25, provided for example by 100 milliliters of ethylene glycol, 75 milliliters of propylene glycol, and 25 milliliters of water.
  • More preferred is a volume ratio of ethylene glycol to propylene glycol to water of 1:0.5:0.25, provided for example by 100 milliliters of ethylene glycol, 50 milliliters of propylene glycol, and 25 milliliters of water. More preferred is a volume ratio of ethylene glycol to propylene glycol to water of 1:0.5:0.5, provided for example by 100 milliliters of ethylene glycol, 50 milliliters of propylene glycol, and 50 milliliters of water. More preferred is a volume ratio of ethylene glycol to propylene glycol to water of 0.75:1:0.25, for example provided by 75 milliliters of ethylene glycol, 100 milliliters of propylene glycol, and 25 milliliters of water.
  • More preferred is a volume ratio of ethylene glycol to propylene glycol to water of 0.75:1:0.5, for example provided by 75 milliliters of ethylene glycol, 100 milliliters of propylene glycol, and 50 milliliters of water. More preferred is a volume ratio of ethylene glycol to propylene glycol to water of 0.5:1:0.25, provided for example by 50 milliliters of ethylene glycol, 100 milliliters of propylene glycol, and 25 milliliters of water. More preferred is a volume ratio of ethylene glycol to propylene glycol to water of 0.5:1:0.5, provided for example by 50 milliliters of ethylene glycol, 100 milliliters of propylene glycol, and 50 milliliters of water.
  • the cooling lubricant is preferably applied to the tool immediately before the workpiece is machined.
  • the application can be carried out by the user himself, for example by transferring a dose of the cooling lubricant to the tool with his fingers or with an aid such as a spatula.
  • the dose of cooling lubricant depends on the size or diameter of the tool. In the case of a typical drill, for example, very good results have been obtained with a dose of as little as about 0.1 gram of coolant or more, particularly with 0.15 grams, 0.2 grams, and 0.35 grams of coolant. Of course, much larger doses can also be used.
  • a method for producing a cooling lubricant for dissipating heat and/or reducing friction between a tool and a workpiece is specified.
  • a method for producing a cooling lubricant as described above is specified. The method comprises the step of providing an aqueous solution and one or more polyols and/or one or more polymers of one or more polyols, with the cooling lubricant being present in particular as a gel.
  • At least one first polyol in particular a dialcohol, particularly preferably propylene glycol, is preferably added to the aqueous solution in a step (i).
  • a further step (ii) preferably at least one second polyol, in particular a dialcohol, particularly preferably ethylene glycol, is added to the aqueous solution. It is also preferred if at least one rheology modifier is added to the aqueous solution between step (i) and the further step (ii).
  • Steps (i) and (ii) are thus preferably carried out in succession.
  • the first mixture can be stirred with a stirring device such as a mixer.
  • the second polyol can then be added to the first mixture, with a second mixture comprising the aqueous solution, the first polyol and the second polyol is produced.
  • a rheology modifier for example a thickener and/or gelling agent
  • a second mixture comprising the aqueous solution, the first polyol, and the rheology modifier would thus be produced.
  • This second mixture can also be mixed with a stirring device.
  • the second polyol can then be added to the second mixture, creating a third mixture comprising the first polyol, the rheology modifier, and the second polyol.
  • a basic compound such as a sodium hydroxide solution is added to the aqueous solution.
  • the aqueous solution could be provided first.
  • the first polyol could be added to the aqueous solution.
  • the rheology modifier could then be added to the aqueous solution comprising the first polyol.
  • the basic compound could then be added to the aqueous solution comprising the first polyol and the rheology modifier.
  • the second polyol could then be added to the aqueous solution comprising the first polyol, the rheology modifier, and the basic compound.
  • a basic compound could then again be added to the aqueous solution comprising the first polyol, the rheology modifier, the basic compound from the previous step, and the second polyol.
  • the figure 1 shows a collection container 6 containing the cooling lubricant 1, a dose 5 of the cooling lubricant 1 being removed from the collection container 6 and applied to a drill bit (not shown).
  • the figure 2 shows a drill bit 3 of a drill 2 comprising a dose 5 of the cooling lubricant 1, wherein machining of the workpiece 4 has not yet started and the drill bit 3 is consequently in the idle state.
  • figure 3 shows the drill bit 3 having the cooling lubricant 1 during a drilling operation, with the drill bit 3 rotating.
  • the cooling lubricant 1 shown in these figures is a cooling lubricant comprising 100 ml mono-ethylene glycol, 50 ml mono-propylene glycol, 50 ml water and 4 grams of the carbomer Carpopol 940 having the CAS number 9007-20-9. How good from the Figures 1 to 3 shows that it is a gel-like cooling lubricant 1. A corresponding depression 7 remains in the cooling lubricant 1 in the collection container 6 at the location of the removed dose 5 (see figure 1 ) and the dose 5 of cooling lubricant 1 applied to the drill bit 3 remains in place (see figure 2 ), ie the cooling lubricant 1 does not flow in the stationary state, but behaves as a semi-solid. Also shown during the drilling process in figure 3 the cooling lubricant 1 remains essentially in place, with in particular no spraying or flowing away of the cooling lubricant 1 being observed.
  • the second cooling lubricant b) tested is a cooling lubricant comprising 100 milliliters of mono-ethylene glycol and 50 milliliters of mono-propylene glycol.
  • the third cooling lubricant c) tested is a cooling lubricant according to the invention comprising 100 milliliters of monoethylene glycol, 50 milliliters of monopropylene glycol and 50 milliliters of water.
  • the fourth cooling lubricant d) tested is another cooling lubricant according to the invention comprising 100 milliliters of monoethylene glycol, 50 milliliters of monopropylene glycol, 50 milliliters of demineralized water and 4 grams Carbopol 940.
  • the fifth cooling lubricant e) tested is another cooling lubricant according to the invention comprising 100 milliliters of mono-ethylene glycol, 50 milliliters of mono-propylene glycol, 50 milliliters of water and 1 gram of Carbopol 940.
  • the drill tip temperature increases at a slower rate, but continues to increase linearly, with a drill tip temperature of around 36 °C being measured at the end of the drilling process after 120 seconds of drilling.
  • the other four cooling lubricants b) to e) lead to a significantly different temperature profile.
  • an essentially constant temperature profile can be observed after an initial drilling time.
  • cooling lubricants b) and c) during the initial drilling time of around 30 seconds, there is an almost linear temperature increase from the initial ambient temperature of 24 °C to around 26.5 °C (cooling lubricant c)) or around 27.5 °C (cooling lubricant b) ) observed.
  • cooling lubricants d) and e on the other hand, only after a drilling time of around 20 seconds is there a small jump in temperature from the initial ambient temperature of around 24 °C to around 25 °C (cooling lubricant e)) or around 26 °C (cooling lubricant d )) was observed.
  • the drill bit having the cooling lubricant b) has the highest temperature and the cooling lubricant e) has the lowest temperature of these four cooling lubricants.
  • the cooling lubricants according to the invention including Carbopol 940, lead to the best results.
  • the good heat dissipation and friction reduction of the cooling lubricants according to the invention is also due to the in figure 5 diagram shown.
  • the cooling lubricant b) requires the shortest time for piercing.
  • a 10 mm thick iron plate is pierced after 29 seconds, a 30 mm thick iron plate after 58 seconds, and a 30 mm iron plate after 87 seconds.
  • a similar time course is found for the cooling lubricant c) according to the invention.
  • a 10 mm thick iron plate is pierced after 30 seconds, a 30 mm thick iron plate after 60 seconds and a 30 mm iron plate after 90 seconds. While both of these cutting fluids allow for the fastest penetration, they result in higher drill bit temperatures, see discussions related to figure 4 above.
  • the lowest temperature curve and a faster drilling time than the commercial cooling lubricant a) could be determined for the cooling lubricant e) according to the invention.
  • a 10 mm thick iron plate is pierced after 32 seconds, a 20 mm thick iron plate after 64 seconds, and a 30 mm thick iron plate after about 96 seconds.
  • the cooling lubricant d) according to the invention slightly more time is required for these thicknesses, namely about 34 seconds in the case of the 10 millimeter thick iron plate, about 68 seconds in the case of the 20 millimeter thick iron plate, and about 102 seconds in the case of the 30 millimeter thick iron plate.
  • the commercially available drilling and cutting oil spray WD-40 here cooling lubricant a
  • FIGs 6a to 9b show the temperature curve of a drill bit over time during a drilling process for other different cooling lubricants.
  • a dose of about 4 grams of cooling lubricant was applied to a drill bit with a diameter of 12 millimeters, and then an iron plate was perforated with this drill bit at a drill speed of 200 rpm, during which the temperature of the drill bit was measured at regular intervals.
  • the figures 6b , 7b , 8b and 9b show the times required for drilling through workpieces of different thicknesses with a drill bit using these different cooling lubricants.
  • cooling lubricants were each applied to a drill bit with a diameter of 12 millimeters, iron plates of different thicknesses being drilled through at a speed of 200 rpm. The time required to drill through the iron plates of different thicknesses was recorded.
  • cooling lubricants in the Figures 7a and 7b 100 milliliters of mono-ethylene glycol and 50 milliliters of polypropylene glycol (a), 50 milliliters of mono-propylene glycol and 100 milliliters of polyethylene glycol (b), and 100 milliliters of polyethylene glycol and 50 milliliters of polypropylene glycol (c).
  • cooling lubricants in the Figures 8a and 8b these are 100 milliliters of mono-ethylene glycol, 50 milliliters of polypropylene glycol, 50 milliliters of water and 4 grams of carbopol (a), 50 milliliters of mono-propylene glycol, 100 milliliters of polyethylene glycol, 50 milliliters of water and 4 grams of carbopol (b), and to 100 milliliters of polyethylene glycol, 50 milliliters of polypropylene glycol, 50 milliliters of water and 4 grams of carbopol (c).
  • the cooling lubricants according to the invention allow shown in the Figures 8a to 9b overall faster perforation at lower temperatures. Namely, for that in the Figures 6a and 6b With the cooling lubricant shown, the temperature rose to 32°C and more, and drilling times of 120 seconds and more were required to drill through, for example, a 3 cm thick iron plate.

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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)
EP21198607.0A 2020-09-25 2021-09-23 Lubrifiant de refroidissement Active EP3974500B1 (fr)

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EP20198328 2020-09-25

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EP3974500A1 true EP3974500A1 (fr) 2022-03-30
EP3974500C0 EP3974500C0 (fr) 2023-06-07
EP3974500B1 EP3974500B1 (fr) 2023-06-07

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2043885A1 (de) * 1970-06-18 1972-03-09 R.W. Moll & Co, 4330 Mülheim-Styrum Synthetische Schmiermittel für die spanende und spanlose Metallbearbeitung
US4781847A (en) * 1986-05-08 1988-11-01 American Polywater Corporation Aqueous lubricant
EP0653473A1 (fr) * 1993-11-11 1995-05-17 Walter H. Maria Wiemeler Procédé de réalisation d'ouverture dans des plafonds creux

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2043885A1 (de) * 1970-06-18 1972-03-09 R.W. Moll & Co, 4330 Mülheim-Styrum Synthetische Schmiermittel für die spanende und spanlose Metallbearbeitung
US4781847A (en) * 1986-05-08 1988-11-01 American Polywater Corporation Aqueous lubricant
EP0653473A1 (fr) * 1993-11-11 1995-05-17 Walter H. Maria Wiemeler Procédé de réalisation d'ouverture dans des plafonds creux

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
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RATHAPON A-SASUTJARIT ET AL: "Viscoelastic Properties of Carbopol 940 Gels and Their Relationships to Piroxicam Diffusion Coefficients in Gel Bases", PHARMACEUTICAL RESEARCH, KLUWER ACADEMIC PUBLISHERS-PLENUM PUBLISHERS, NL, vol. 22, no. 12, 1 December 2005 (2005-12-01), pages 2134 - 2140, XP019370766, ISSN: 1573-904X, DOI: 10.1007/S11095-005-8244-2 *

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