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
  • C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
  • C09K5/08—Materials not undergoing a change of physical state when used
  • C09K5/10—Liquid materials
• • C—CHEMISTRY; METALLURGY
  • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
  • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
  • C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
  • C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
  • C23F11/10—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using organic inhibitors
  • C23F11/14—Nitrogen-containing compounds
  • C23F11/145—Amides; N-substituted amides

Definitions

• Aqueous coolants for the engine running-in phase containing ammonium salts from
• the present invention relates to an aqueous coolant which has good vapor space corrosion inhibitor properties due to the addition of ammonium salts of phthalic acid monoamides, in particular for the preservation of engine rinsing lines.
• the coolants according to the invention are preferably used during the running-in phase of newly built engines (engine running-in liquids).
• the coolants used are those based on oil or based on monoethylene glycol or monopropylene glycol. Often, for reasons of cost, the usual coolant concentrates used in motor vehicles are used, which are then further diluted.
• DE 184 725 discloses the use of nitrites of the alkali and alkaline earth metal metals in combination with phosphates of secondary amines in corrosion-preventing packaging material.
• DD-P 14 440 discloses a corrosion-protective packaging material in which aixurionium nitrites have been applied together with cationic wetting agents.
• DE-AS 2 141 393 describes a corrosion-preventing packaging material which has a paper material with a certain fiber length, oil-soluble products of petroleum-chemical synthesis are used as inhibitors, preferably salts of benzoic acid.
• No. 4,124,549 describes the use of salts of certain carboxylic acids, including benzoic acid, with organic amines as a vapor space corrosion inhibitor. The salts are incorporated into a thermoplastic resin that is used as packaging material after extrusion.
• this is e.g. a mixture consisting of 2.1 to 250 g / 1 ammonium benzoate, 0.5 to 60 g / 1 p-hydroxybenzoic acid ester, 1 to 120 g / 1 benzotriazole and 0.4 to 50 g / 1 dimethylaminoethanol, in EP-A- 221 212, a steam mixture corrosion-inhibiting, aqueous mixture containing an alkylene glycol, optionally a polyoxyalkylene glycol and as a corrosion inhibitor, a polyoxyalkylene amine with a certain weight ratio of oxyethylene to oxypropylene is proposed.
• Benzoates are often used in combination with other substances in mixtures which prevent corrosion in the vapor space, and the use of benzoates in cooling liquids of internal combustion engines has also been known for a long time. These fluids are generally formulated to be used to prevent corrosion in the fluid space.
• WO 97/30133 describes corrosion-inhibiting mixtures for use as coolants in internal combustion engines which contain quaternized imidazoles as the active ingredient.
• the sodium salts of benzoic acid are mentioned as further components which may be present. These mixtures serve to prevent corrosion that can occur in the liquid space of the cooling ducts of internal combustion engines.
• Corrosion-inhibiting mixtures which are also used to prevent corrosion in the liquid space of the cooling ducts of internal combustion engines, are also disclosed in EP-A 0 816 467.
• the mixtures described therein contain 0.5 to 10 percent by weight of a carboxylic acid with 3 to 16 carbon atoms in the form of its alkali metal, ammonium or substituted ammonium salts and 0.01 to 3 percent by weight of at least one hydrocarbon triazole and / or
• Hydrocarbon thiazole especially benzotriazole and / or tolutriazole.
• a carboxylic acid i.a. Benzoic acid can be used.
• the mixtures, which are present as antifreeze concentrates, are free of silicate, borate and nitrate.
• US 4,711,735 describes a complex mixture for preventing corrosion and deposits in cooling systems of internal combustion engines.
• This mixture contains 0.017 to 0.42% ricinoleic acid, 0.007 to 0.083% benzotriazole, 0.5 to 1.5% mercaptobenzothiazole, 0.17 to 4% styrene maleic anhydride with a molecular weight of 200 to 3500, 0.42 to 2% benzoic acid, 0 , 42 to 4.0% of a salt of benzoic acid, 0.33 to 3.3% nitrite, 0.37 to 3.7% nitrate and 0.42 to 3% carboxymethylmercapto-succinic acid.
• This is intended to prevent corrosion in the liquid space, and it is also mentioned that an effect which inhibits the vapor space corrosion can occur.
• WO 00/22190 describes aqueous engine running-in agents with vapor space corrosion protection which contain one or more ammonium salts of carboxylic acids which have 5 to 18 C atoms and particularly preferably 6 to 12 C atoms.
• EP A 1 111 092 describes aqueous engine inlet cooling liquids which contain ammonium and / or alkali salts, optionally alkyl-substituted benzoic acid, as vapor space corrosion inhibitors.
• the applicant's unpublished German patent application with the file number 10064737.5 from December 22, 2000 relates to aqueous coolants with vapor space corrosion-inhibiting properties for the running-in phase of internal combustion engines, containing at least one ammonium salt of an optionally substituted C 1 -C mono- or dicarboxylic acid.
• the object of the present invention is to provide further aqueous coolants for internal combustion engines which enable effective vapor space corrosion inhibition in engine rinsing sections from which the coolant has been removed and which are subsequently stored.
• these coolants are said to be inexpensive, obtainable only by slight manipulations of commercially available coolants or coolant concentrates for internal combustion engines, and should be disposed of in an environmentally friendly manner.
• R and R can be the same or different and represent hydrogen or a linear or branched, cyclic or acyclic CrC ⁇ alkyl radical and A + an ammonium cation, as a vapor space corrosion inhibitor in aqueous coolants of internal combustion engines, especially in the run-in phase, after which the coolant runs out the engine cooling circuit is drained.
• an aqueous coolant with vapor-chamber corrosion-inhibiting properties in particular for the running-in phase of internal combustion engines, after which the coolant is drained off (engine running-in liquid), containing at least one ammonium salt of phthalic acid monoamides of the formula (I) in addition to the accompanying and usual in cooling liquids for internal combustion engines excipients.
• ammonium salts of a phthalic acid monoamide of the formula (I) are used in which R and R are identical or different and have the meaning given above.
• alkyl radicals R 1 and R 2 are methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, tert-butyl, n-pentyl, i-pentyl, neopentyl, n-hexyl, cyclohexyl, n-heptyl, n-octyl, 2-ethylhexyl, isononyl, decyl, dodecyl and octadecyl.
• Ammonium salts of phthalic acid monoamides of the general formula (I) are preferably used, in which R and R are identical or different and are methyl, ethyl, n-propyl, i-propyl, n-hexyl and 2-ethylhexyl and A + is an ammonium cation.
• ammonium salt of phthalic acid monoamides of the general formula (I) is preferred, in which R 1 and R 2 are different from one another and represent methyl and 2-ethylhexyl.
• ammonium cations A + cations of the type [NHR 3 R 4 R 5 ] + can be used, where R 3 , R 4 and R 5 can be identical or different and hydrogen or linear or branched, cyclic or acylalkyl radicals with a carbon number of Can be 1 to 6, wherein the alkyl radicals can be unsubstituted or can have one or more OH substituents.
• Preferred ammonium cations A + are NH 4 + , mono-, di- and trialkylammonium cations with 1 to 5 carbon atoms per alkyl radical and mono-, di- and trialkanolammonium cations with 1 to 5 carbon atoms per alkyl radical.
• NH 4 and ethanolammonium cations are preferred.
• the most preferred cation A + is the triethanolammonium cation.
• the most preferred salt of formula I is the triethanolammonium salt of phthalic acid mono-N-methyl-N-2-ethylhexylamine.
• a certain phthalic acid monoamide or a mixture of two or more of these amides mentioned, in each case in the form of the ammonium salt, can be used.
• the salts according to the invention are present in the aqueous coolant which is filled into the cooling ducts of the engine in concentrations of ⁇ 10% by weight, preferably 0.1 to 5% by weight.
• concentrations ⁇ 10% by weight, preferably 0.1 to 5% by weight.
• a particularly preferred concentration range is from 0.2 to 1.5% by weight.
• the coolants used can contain the usual accompanying and auxiliary substances for coolants for internal combustion engines known to a person skilled in the art. These are, for example, monoethylene glycol, monopropylene glycol, glycerol and / or mixtures thereof, aliphatic and / or aromatic mono- and dicarboxylic acids and their alkali, alkaline earth or ammonium salts, triazole derivatives, imidazole derivatives, thiazole derivatives, silicates, nitrites, nitrates, phosphates, amines, alkali metal hydroxides , Pyrrolidone derivatives, polyacrylates, alkaline earth metal salts of organic or inorganic acids such as for example magnesium acetate or nitrate, molybdates, tungstates, phosphonates and borates.
• monoethylene glycol, monopropylene glycol, glycerol and / or mixtures thereof aliphatic and / or aromatic mono- and dicarboxy
• the coolants or engine inlet fluids according to the invention with a vapor chamber corrosion inhibitor effect can be easiest obtained from the customary, commercially available radiator protection concentrates by adding the phthalic acid monoamide ammonium salt of the general formula (I) and then diluting it with water in amounts of 1/5 to 1/20, preferably 1 / 8 to 1/15, especially 1/10 concentrate / water.
• These coolant protection concentrates which contain ammonium salts of phthalic acid monoamides of the general formula (I), are also covered by this application.
• These concentrates contain the phthalic monoamide ammonium salts used according to the invention in the amount which is correspondingly increased compared to the ready-to-use coolants, preferably 1 to 50% by weight, in particular 2 to 15% by weight.
• the coolants according to the invention are advantageously produced by mixing the individual components or diluting concentrates and adding the phthalic acid monoamides at a temperature of 20 to 50 ° C.
• the coolants according to the invention contain water in a proportion of 80 to 98 percent by weight, preferably 90 to 97 percent by weight.
• coolants with a pronounced vapor space corrosion inhibitor effect can be obtained.
• Such coolants can advantageously be used in particular during the running-in phase of internal combustion engines after the coolant has been removed from the cooling circuit of the engine and the engines have been temporarily stored.
• aqueous coolant formulations A and B according to the invention were compared to a coolant which corresponds to the composition of the coolant formulation A without the triethanolammonium salt of phthalic acid-mono-N-methyl-N-2-ethylhexyl-amide in the condensation water climatic chamber corrosion test according to DIN 50 described below 017 tested:
• the sweat chamber is completely cleaned before each new attempt, i.e. old water is completely removed, walls and ceiling are wiped with a clean cloth and the chamber is completely dried.
• the sweat chamber is then refilled with 4 liters of distilled water.
• Two boiler plates made of CK 15 steel (100 mm x 50 mm x 3 mm) according to DIN 51357 - DIN 17200 are used for each test. They are cleaned thoroughly with a cloth moistened with acetone, sanded on both sides and all edges with a grinding machine and thoroughly cleaned again with a cloth moistened with acetone.
• the boiler plates are completely poured over the coolant to be tested in a 400 ml beaker and covered with a watch glass; the beaker is then heated to the boil of the liquid and then left to cool for one hour at room temperature. Then the sheets are removed from the test liquid. After drying, they are hung in the sweat chamber and the experiment is started.

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Organic Chemistry (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Thermal Sciences (AREA)
• Combustion & Propulsion (AREA)
• Physics & Mathematics (AREA)
• Mechanical Engineering (AREA)
• Metallurgy (AREA)
• Preventing Corrosion Or Incrustation Of Metals (AREA)
• Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
• Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
• Indole Compounds (AREA)

Applications Claiming Priority (3)

Publications (1)

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• 2002
  • 2002-01-16 DE DE10201446A patent/DE10201446A1/de not_active Withdrawn
• 2003
  • 2003-01-10 AR ARP030100062A patent/AR038290A1/es not_active Application Discontinuation
  • 2003-01-16 JP JP2003560125A patent/JP4002241B2/ja not_active Expired - Fee Related
  • 2003-01-16 WO PCT/EP2003/000422 patent/WO2003060036A1/de not_active Application Discontinuation
  • 2003-01-16 BR BRPI0306938-9A patent/BR0306938A/pt not_active IP Right Cessation
  • 2003-01-16 CN CNB038039982A patent/CN1271166C/zh not_active Expired - Fee Related
  • 2003-01-16 EP EP03729478A patent/EP1468060A1/de not_active Withdrawn
  • 2003-01-16 US US10/501,549 patent/US20050040362A1/en not_active Abandoned
  • 2003-01-16 PL PL03373535A patent/PL373535A1/xx not_active Application Discontinuation
  • 2003-01-16 AU AU2003210163A patent/AU2003210163A1/en not_active Abandoned
  • 2003-01-16 CA CA002473430A patent/CA2473430A1/en not_active Abandoned
  • 2003-01-16 MX MXPA04006904A patent/MXPA04006904A/es active IP Right Grant
  • 2003-01-16 KR KR10-2004-7011115A patent/KR20040081459A/ko not_active Application Discontinuation
• 2004
  • 2004-07-15 ZA ZA200405631A patent/ZA200405631B/en unknown
• 2007
  • 2007-07-24 US US11/782,428 patent/US20080017828A1/en not_active Abandoned

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