Classifications

• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
  • C09K3/00—Materials not provided for elsewhere
  • C09K3/18—Materials not provided for elsewhere for application to surfaces to minimize adherence of ice, mist or water thereto; Thawing or antifreeze materials for application to surfaces
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
  • C09K3/00—Materials not provided for elsewhere
  • C09K3/18—Materials not provided for elsewhere for application to surfaces to minimize adherence of ice, mist or water thereto; Thawing or antifreeze materials for application to surfaces
  • C09K3/185—Thawing materials

Definitions

• the present invention relates to a composition for reducing the freezing point, in particular water, or respectively to prevent ice formation, and to a means for defrosting car glazing, cooling elements in heat pumps and wing profiles in aircraft.
• water / glycol-based deicing agents are used to remove the ice layers.
• the work required is complex and, at very low temperatures, it also takes a relatively long time until the ice layer can at least be removed in such a way that one has to think of moving away.
• EP 360 183, EP 586 127, EP 678 565, EP 769 541, DE 19 40 825 and US 5 389 276 it is proposed to add a polymeric acrylic thickener to the water / glycol based deicing agent.
• WO 94/25538 proposes a poly (N-vinyl-pyrrolidine) or a crosslinked maleic andhydride / methyl vinyl ether copolymer as a thickener, while EP 257 720 as a thickener is natural or artificial rubber, cellulose ether, carboxyethyl -Cellulose and Hydroxy-Ethylcellulose proposes.
• EP 743 305 in turn proposes a polyether amide which is suitable as a thickener.
• DE 31 42 059 finally proposes cellulose derivatives as thickeners.
• the object is achieved by means of a composition or a method according to the wording according to claim 1 or according to claim 12.
• a composition or an agent for reducing the freezing point, in particular of water, or for deicing which, in addition to the generally known components in such substances, such as glycols, additionally contains a thickener which measures the composition or the agent of inclined or vertical surfaces at least inhibits which composition according to the invention additionally contains a hygroscopic additive and / or a short-chain aliphatic monohydric alcohol.
• the thickener can be, for example, high-molecular substances which lead to the composition of inclined or vertical surfaces no longer flowing away, such as, for example, carboxymethyl cellulose, carboxymethyl cellulose derivatives, polyacrylates, polymethacrylates, polycarboxylic acids, polyethers, polyamides, alginates, gum arabic, etc.
• thixotropic agents are known to greatly increase the viscosity of relatively thin liquids per se when they are in the so-called quiescent state.
• thixotropic agents can be, for example, bentonite, caolin, alginic acid, silicon compounds or metal oxide gels.
• hygroscopic substances such as, for example, glycerol, pentaerythritol or sorbitol
• the deicing agent has a certain affinity for water and thus the viscosity can be rapidly reduced by adding small amounts of water .
• the deicing agent can be removed relatively easily by adding water even after a long period of time on the surface to be de-iced. In the case of car windows in particular, it is thus possible to remove the deicing agent by actuating the windshield wiper system, so that no greasy or oily surface remains on the window, thus ensuring a clear view.
• the surface at risk of icing is sprayed with the composition as a preventive measure while it is still warm, preferably at a temperature above freezing point.
• the composition forms a on the treated surface preferably, but not necessarily, complete covering.
• the composition is preferably a mixture of alcohol, organic solvents, the above-mentioned thickeners, corrosion inhibitors and, for extreme temperatures, salts.
• Low-viscosity, short-chain aliphatic, monohydric alcohols are preferably used. These alcohols in turn reduce the viscosity of the deicing agent, at least during application, which alcohols subsequently evaporate, for example as a result of the relatively low boiling point.
• the composition lowers the freezing point, for example atmospheric precipitation such as freezing rain, dew, snow and the like. and thus prevents ice formation on the wetted surface.
• the atmospheric precipitation forms a gel-like mixture on the surface with the composition, which can be easily removed mechanically. In the case of only treated areas or contiguous wetting of the cold surface, the composition is distributed to non-wetted areas due to the mechanical stress and dissolves the ice layer by lowering the freezing point.
• composition or substance can also be applied to already iced surfaces, like a conventional deicing agent.
• the composition proposed according to the invention for the removal of the composition proposed according to the invention, in particular if it contains the above-mentioned proposed short-chain, aliphatic, monohydric alcohols during application, it is advantageous, again with the same or an analog one Apply alcohol-added water to reduce the viscosity of the composition again so that the surface can be cleaned quickly.
• the addition of the alcohol means that the surface can be cleaned quickly and without greasing and the ice can be removed.
• composition defined according to the invention are, for example, preventing icing of a car glazing during the winter months,
• compositions or substance according to the invention can be sprayed, sprayed, spread on or applied by immersion. Aerosol cans, spray bottles, tubes and the like are available as application forms for the retail trade.
• the following substances are particularly suitable as constituents for the compositions according to the invention for reducing the freezing point or for keeping surfaces free of ice:
• thixotropic agents commonly used in the paint industry, such as, for example, bentonite, caolin, alginic acid, silicon oxide compounds and metal oxide gels.
• alcohols commonly used in deicing agents can be used.
• Short-chain, monohydric alcohols with up to six carbon atoms such as ethanol, isopropanol, n-propanol, 1-butanol, 2-butanol (sec. Butyl alcohol), 2-methyl-2-propanol (tert. Butyl alcohol) are preferably used ), etc.
• Suitable organic solvents or freezing point-lowering substances are those from the group of short-chain diols (glycols) such as ethylene glycol, propylene glycol, 1, 3-butanediol, etc. and / or glycol ether with the general formula RO- (CH2) nOR such as ethylene glycol menethyl ethyl ether, ethylene glycol monopropyl ether, ethylene glycol monobutyl ether, diethylene glycol monobutyl ether, ethylene glycol diethyl ether and / or diol ester (glycol ester), prepared by esterification of one or both hydroxyl groups, such as ethylene glycol monobutyl ether acetate, ethylene glycol monomethyl ether ethyl acetate, propylene ether,
• Salts Inorganic salts, such as sodium chloride, potassium chloride, sodium sulfate, sodium phosphate, etc., are suitable as salts, especially for use at extremely low temperatures.
• Corrosion protection agent All known, corrosion-inhibiting or corrosion-preventing substances which are generally used to correct the corrosion are suitable. to prevent sion on a body, such as organic bases, basic salts, etc.
• Hygroscopic additives glycerin, pentaerythritol, sorbitol.
• composition defined according to the invention are of course suggestions which can be expanded as desired. It is essential to the invention that a means is proposed for reducing the freezing point or for keeping a surface ice-free, which is essentially based on a conventional deicing composition, but which additionally contains a thickening agent which prevents the deicing agent from being measured off inclined or vertical surfaces , as well as a hygroscopic additive and / or a short-chain aliphatic monohydric alcohol.
• the test was based on a deicing agent of the following composition:
• a cleaned, upright, dry pane was sprayed with the de-icing agent at normal temperature and then cooled to minus 25 ° C. and stored for 120 hours.
• the condition of the pane was assessed visually at 24-hour intervals and the removability of the deicing agent from the pane was checked with the aid of a rubber scraper.
• the deicing agent could easily be removed with a rubber scraper.
• a cleaned, upright, dry pane was sprayed with the deicing agent at normal temperature. Subsequently, a fine water film was applied to the deicing agent using a spray bottle. The disk was then cooled to minus 25 ° C. and stored for 48 hours. The condition of the pane was assessed visually at 24-hour intervals and the removability of the deicing agent from the pane was checked using a rubber scraper.
• the coating had run down in places. After 48 hours of storage, the deicing agent could easily be removed with a rubber scraper.

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Combustion & Propulsion (AREA)
• Materials Engineering (AREA)
• Organic Chemistry (AREA)
• Materials Applied To Surfaces To Minimize Adherence Of Mist Or Water (AREA)
• Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)

Applications Claiming Priority (3)

Publications (1)

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Family Applications (1)

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• 1997
  • 1997-08-29 DE DE29723589U patent/DE29723589U1/de not_active Ceased
  • 1997-08-29 AU AU39367/97A patent/AU3936797A/en not_active Abandoned
  • 1997-08-29 JP JP10512081A patent/JP2000517366A/ja active Pending
  • 1997-08-29 CA CA002264882A patent/CA2264882A1/en not_active Abandoned
  • 1997-08-29 EP EP97936547A patent/EP0950084A1/de not_active Withdrawn
  • 1997-08-29 WO PCT/CH1997/000315 patent/WO1998010032A1/de not_active Application Discontinuation

Non-Patent Citations (1)

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