Classifications

• • 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
  • C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
  • C10M169/04—Mixtures of base-materials and additives
• • 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
  • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
  • C10M2201/06—Metal compounds
  • C10M2201/062—Oxides; Hydroxides; Carbonates or bicarbonates
• • 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
  • C10M2229/00—Organic macromolecular compounds containing atoms of elements not provided for in groups C10M2205/00, C10M2209/00, C10M2213/00, C10M2217/00, C10M2221/00 or C10M2225/00 as ingredients in lubricant compositions
  • C10M2229/02—Unspecified siloxanes; Silicones
  • C10M2229/025—Unspecified siloxanes; Silicones used as base material
• • 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
  • C10N2010/00—Metal present as such or in compounds
  • C10N2010/08—Groups 4 or 14
• • 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
  • C10N2010/00—Metal present as such or in compounds
  • C10N2010/14—Group 7
• • 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
  • C10N2010/00—Metal present as such or in compounds
  • C10N2010/16—Groups 8, 9, or 10
• • 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
  • C10N2040/14—Electric or magnetic purposes
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H37/00—Thermally-actuated switches
  • H01H37/02—Details
  • H01H37/32—Thermally-sensitive members
  • H01H37/36—Thermally-sensitive members actuated due to expansion or contraction of a fluid with or without vaporisation

Definitions

• Silicone oil as a working fluid for a thermostat and such a Thermostat
• the invention relates to a silicone oil for a thermostat, a method for pre-aging a working fluid for a thermostat and the Ver ⁇ use of such a working fluid in a thermostat.
• thermostats are known, as used, for example ver ⁇ for the control of heating power.
• a closed system is filled with a supply of working fluid, for example silicone oil, and leads via a fluid-conducting connection to a switch release or derglei ⁇ Chen.
• working fluid for example silicone oil
• a switch release or derglei ⁇ Chen By changing the temperature, there is a change in the volume expansion of the working fluid or of the silicone oil, which can be converted into a displacement change that triggers a switch.
• the service life and the accuracy of the thermostat over a longer period of time depends on the quality of the working fluid.
• the object of the invention is to provide or produce an operating fluid mentioned above and a thermostat filled with it in order to avoid disadvantages of the prior art and, in particular, age stability and temperature resistance of the working fluid and thus of the entire thermostat to improve.
• a stabilizer is added to the silicone oil for use in a thermostat. This serves to reduce age-related or temperature-induced changes in the silicone oil and, above all, to improve thermal stability. After these points of view, a stabilizer is selected. By such an addition or such a stabilizer, the negative consequences, as described above, can be avoided.
• the silicic acid added with the stabilizer has long-term stable, consistent properties. INS In particular, its thermal expansion or its thermal expansion behavior do not change.
• a possible silicone oil is, for example, polydimethylphenylsiloxane.
• a stabilizer can be selected to bind potential reactants or reaction products in the silicone oil so that they do not degrade the properties of the silicone oil. He can also bind free radicals. These, too, could otherwise react with the silicone oil itself or change it and in particular worsen its properties. Above all, a stabilizer can bind, for example, dissolved oxygen particles in the silicone oil.
• the proportion of the stabilizer on the silicone oil depends, of course, on the type of stabilizer, and possibly also on the use of the silicone oil or the thermostat. Furthermore, the properties of the silicone oil should remain dominant throughout the blend. Thus, for example, the proportion of the stabilizer can amount to a maximum of 5%, advantageously even lower, for example up to 3%.
• an oxidizing agent can be advantageously used.
• This can be a metal oxide.
• the metal oxide is preferably titanium dioxide, in particular pyrogenic titanium dioxide can be used. This can be prepared by flame hydrolysis of titanium tetrachloride.
• a metal oxide or the abovementioned titanium dioxide itself may in turn be doped to improve its properties.
• One possibility is a doping with iron oxide, for example up to a percentage of 5%.
• FeCl 3 can be added to the abovementioned material so that, for example, a titanium dioxide doped with 2% Fe 2 O 3 is obtained.
• the primary particles are not in isolated form before, but as aggregates or agglomerates. There are exceptionally small primary particles, which require a relatively large specific surface area of about 50m 2 / g.
• titanium dioxide causes heat stabilization of the silicone oil due to the oxidizing properties of the metal ions. Electrons can be taken up and free radicals are thereby rendered harmless, which arise during the thermal loading of the silicone oil. Uncontrolled reactions or polymerizations as well as oxidation reactions are severely restricted.
• the working fluid for use in a thermostat that provides a good and consistent long-term function, it can be pre-aged by heating.
• This has the advantage that on the one hand, especially at the beginning of aging, the changes in relation to the elapsed time show relatively strong effects. Inso ⁇ it is in such a Voralterungsvon advantageous to perform this before use in the thermostat.
• a heating can be carried out at a temperature which is significantly, advantageously even very clearly, above the foreseeable starting temperature.
• a pre-aging temperature can even reach twice the maximum operating temperature, advantageously between 20% and 50% above it.
• silicone oil which is particularly suitable for pre-aging
• other working fluids used hitherto can also be pre-aged.
• stabilizers is also advantageous here, for example also the aforementioned stabilizers.
• One embodiment comprises a silicone oil, namely polydimethylphenylsiloxane, to which 2% pyrogenic titanium dioxide is added.
• the pyrogenic titanium dioxide is doped with 2% iron dioxide.
• Ar- beitsfluid is pre-aged in a tank for several hours, for example 6 to 10 hours, at a temperature of 370 0 C.
• the thus treated working fluid is filled in a thermostat and this adjusted before installation.
• the thermostat can be installed in an oven, for example, in order to effect a type of temperature measurement and regulation there.

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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)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=35115702

Family Applications (1)

Country Status (4)

Cited By (1)

Families Citing this family (2)

Citations (8)

Family Cites Families (3)

• 2004
  • 2004-08-27 DE DE102004042829A patent/DE102004042829A1/de not_active Withdrawn
• 2005
  • 2005-08-25 WO PCT/EP2005/009169 patent/WO2006024451A1/de active Application Filing
  • 2005-08-25 CN CN2005800289805A patent/CN101023333B/zh not_active Expired - Fee Related
  • 2005-08-25 EP EP05774313A patent/EP1792151A1/de not_active Withdrawn

Patent Citations (8)

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