DK149960B - ANTI-FROZEN, CORROSION AGENT - Google Patents
ANTI-FROZEN, CORROSION AGENT Download PDFInfo
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- 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
- C09K5/20—Antifreeze additives therefor, e.g. for radiator liquids
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Description
149960149960
Opfindelsen angår et frosthindrende, korrosionshæmmende middel til kølevæsker, hvilket middel indeholder 1,2-alkylenglycol, et alkalisalt af borsyre, alkalisilikat, benztriazol, eventuelt methyleret nitrophenol eller dets alkalisalt, alkalinitrit, alkalihydroxid og eventuelt vand, i 5 hvilket middel alkalihydroxid er tilstede i en sådan mængde, at når antifrostblandingen fortyndes med vand i et forhold på fra 1:1 til 1:3 fremkommer der en pH-værdi på fra 8,0 til 9,0.The invention relates to a antifreeze, anticorrosive agent for coolants, which contains 1,2-alkylene glycol, an alkali salt of boric acid, alkali silicate, benztriazole, optionally methylated nitrophenol or its alkali salt, alkaline nitrite, alkali hydroxide and optionally water, an amount such that when the antifreeze mixture is diluted with water in a ratio of 1: 1 to 1: 3 a pH of 8.0 to 9.0 is obtained.
Den stadige udvikling af bil konstruktioner har ført til udformninger, som kræver yderst ringe vedligeholdelse. For mange bilmotorers 10 vedkommende forventes det således, at kølevæsken vil forblive i kølesystemet i mindst to år.The constant development of car designs has led to designs that require extremely little maintenance. For many car engines 10, it is thus expected that the coolant will remain in the cooling system for at least two years.
Parallelt med denne udvikling anvendes der flere og flere letmetallegeringer i motorkonstruktionen med henblik på at økonomisere vægt og omkostninger. Ydermere fører konstruktionsforanstaltninger, som er 15 nødvendige af hensyn til miljøbeskyttelse og energibesparelse, til en stadig større termisk belastning af kølevæskerne.In parallel with this development, more and more light metal alloys are being used in the engine design in order to economize weight and cost. In addition, structural measures, which are necessary for environmental protection and energy conservation, lead to an increasing thermal load on the coolants.
De metaller eller metallegeringer, der anvendes i kølesystemet, er alle udsat for risikoen for korrosion, men letmetallerne er på grund af deres position i grundstoffernes elektrokemiske række især udsat for 20 kemiske angreb. Der foreligger den yderligere effekt, at metaldelene er forbundet med hinanden og sammen med kølevæsken danner galvaniske elementer.The metals or metal alloys used in the cooling system are all subject to the risk of corrosion, but due to their position in the electrochemical series of the elements, the light metals are particularly exposed to 20 chemical attacks. The additional effect is that the metal parts are interconnected and together with the coolant form galvanic elements.
Til forhindring af korrosion i kølesystemer er der blevet foreslået og anvendt adskillige korrosionshæmmere i frosthindrende blandinger.To prevent corrosion in cooling systems, several corrosion inhibitors have been proposed and used in antifreeze mixtures.
25 De bedst kendte er borax, alkalinitritter, salte af benzoesyre, salte af phosphorsyre, alkalicarbonater, alkalihydroxider, aminer, al kanolaminer, benztriazol, natriummercaptobenztriazol og natriummetasilikat. De individuelle hæmmere frembringer almindeligvis kun deres korrosionsreducerende virkning over for et enkelt metal eller en lille gruppe 30 af metaller. Til en tilfredsstillende frosthindrende blanding må derfor forskellige hæmmere kombineres med hinanden. Imidlertid udviser mange af de kendte additiver negative såvel som positive egenskaber med hensyn til deres korrosionshæmmende adfærd. De kan have en korrosionsreducerende virkning på nogen metaller, medens de på samme tid 35 fremmer kølevæskens angreb på andre metaller. Ved at kombinere hæmmere kan man endog komme til at undertrykke de gunstige egenskaber, medens de ugunstige egenskaber forstærkes. Ved formulering af et frosthindrende middel må der derfor foretrages en omhyggelig udvælgelse af kompatible additiver. Ved dette valgs fastlæggelse må 149960 2 den frosthindrende blandings virkning bestemmes ved undersøgelser, som ligger tæt pi de praktiske betingelser, fordi forudsigelse af en frosthindrende blandings egenskaber på basis af de individuelle komponenters egenskaber i almindelighed er umulig eller kun mulig i 5 meget begrænset udstrækning.The best known are borax, alkaline nitrite, salts of benzoic acid, salts of phosphoric acid, alkali carbonates, alkali hydroxides, amines, all canolamines, benztriazole, sodium capaptobenztriazole and sodium metasilicate. The individual inhibitors generally produce only their corrosion-reducing action against a single metal or small group of 30 metals. For a satisfactory antifreeze mixture, different inhibitors must therefore be combined with each other. However, many of the known additives exhibit negative as well as positive properties in their corrosion inhibiting behavior. They can have a corrosion-reducing effect on some metals, while at the same time promoting the coolant's attack on other metals. By combining inhibitors, one may even suppress the beneficial properties while reinforcing the adverse properties. Therefore, when formulating an antifreeze agent, careful selection of compatible additives must be preferred. In determining this choice, the effect of the antifreeze mixture must be determined by studies which are close to the practical conditions, because prediction of the antifreeze mixture properties based on the properties of the individual components is generally impossible or only possible to a very limited extent.
Et frosthindrende middel, der tilfredsstiller de fleste af disse krav, kendes fra tysk fremlæggelsesskrift nr. 14 92 522. Dette frosthindrende middel indeholder polyvalente alkoholer, alkalisilikat, et alkalisalt af borsyre, basisk reagerende alkaliforbindelser, en eller flere 10 af forbindelserne mercaptobenzothiazol, mercaptothiazolin, benztriazol og vand samt fra 0,005 til 1,000 vægtprocent nitrophenoler, der eventuelt kan være substitueret med en lavere alkylrest, eller deres alkalisalte og fra 1,0 til 5,0 vægtprocent borax.An antifreeze agent satisfying most of these requirements is known from German Patent Specification No. 14 92 522. This antifreeze agent contains polyhydric alcohols, alkali silicate, an alkali salt of boric acid, alkaline reacting alkali compounds, one or more of the compounds mercaptobenzothiazole, mercaptiazole, benztriazole and water, as well as from 0.005 to 1,000 weight percent nitrophenols, which may be optionally substituted with a lower alkyl residue, or their alkali salts and from 1.0 to 5.0 weight percent borax.
Der er imidlertid blevet erkendt visse problemer ved brugen af 15 dette middel. Det første problem er et fald i antikorrosionsegenskaber, nir koncentrationen af det frosthindrende middel i kølevæsken er lav. I tilfælde af kølevæsketab fyldes kølesystemet ofte op med vand, navnlig om sommeren. Som resultat heraf falder koncentrationen af den frosthindrende blanding og kan blive så lav, at den korrosionsbeskyttelses-20 virkning, der oprindelig var til stede i kølesystemet, reduceres betragteligt eller går fuldstændig tabt. En anden ulempe er, at den korrosionsbeskyttelse, som de kendte frosthindrende midler tilvejebringer for aluminium og visse aluminiumlegeringer, ikke er specielt god.However, certain problems have been recognized with the use of this agent. The first problem is a decrease in anti-corrosion properties when the concentration of the antifreeze in the coolant is low. In case of coolant loss, the cooling system is often filled with water, especially in summer. As a result, the antifreeze mixture concentration decreases and may become so low that the corrosion protection effect initially present in the cooling system is significantly reduced or completely lost. Another disadvantage is that the corrosion protection provided by the known antifreeze agents for aluminum and certain aluminum alloys is not particularly good.
25 Det har nu overraskende vist sig muligt at undgå eller mindske ovennævnte ulemper, idet det er lykkedes at tilvejebringe et frosthindrende middel til kølevæsker, hvilket middel har anti korrosionsegenskaber i lavere koncentrationer end ovennævnte kendte middel, og som tillige tilvejebringer særlig god korrosionsbeskyttelse af aluminium og 30 aluminiumlegeringer, såsom AlSi^/ AlMn, "Silafont" (aluminiumstøbelege-ring), "Avional" (aluminiumsmedelegering), AlSigCUg, AICuN^/It has now surprisingly been found possible to avoid or mitigate the aforementioned drawbacks, having succeeded in providing an antifreeze for coolants, which has anti-corrosion properties at lower concentrations than the above known agent, and which also provides particularly good corrosion protection of aluminum and Aluminum alloys such as AlSi / AlMn, "Silafont" (aluminum casting alloy), "Avional" (aluminum alloy alloy), AlSigCUg, AICuN
AlSi^Q*1 OlVlgCu, AlSigCu^ og AISi^MgCu, og samtidig udøver en effektiv hæmning på korrosionen af metaller som kobber, loddemetal, messing, stål og støbejern, jvf. afprøvningsresultaterne i de efterfølgende 35 tabeller 1-8. Den gode beskyttelse af aluminium og aluminiumlegeringer udgør en betydelig fordel, eftersom aluminium og aluminiumlegeringer nu anvendes i udstrakt grad som konstruktionsmaterialer til forbrændingsmotorer og deres kølesystemer.AlSi ^ Q * 1 OlVlgCu, AlSigCu ^ and AISi ^ MgCu, and at the same time exerts an effective inhibition on the corrosion of metals such as copper, solder, brass, steel and cast iron, cf. the test results in the following 35 Tables 1-8. The good protection of aluminum and aluminum alloys represents a significant advantage, since aluminum and aluminum alloys are now widely used as combustion engine construction materials and their cooling systems.
Ovenstående fordele opnås med kølemidlet med de indledningsvis 3 149960 angivne karakteristika, når det ifølge opfindelsen er ejendommelig ved, at det også indeholder alkalinitrat, alkanolamin og ethoxyleret mercaptobenzimidazol og i øvrigt indeholder: a) 1,0 til 4,0 vægtprocent af et alkalisalt af borsyre, 5 b) 0,03 til 0,3 vægtprocent alkalisilikat, c) 0,05 til 1,0 vægtprocent alkalihydroxid, d) 0,03 til 0,2 vægtprocent benztriazol, e) 0,03 til 0,3 vægtprocent eventuelt methyleret nitrophenol eller dets alkalisalt, 10 f) 0,05 til 0,3 vægtprocent alkalinitrit, g) 0,05 til 0,4 vægtprocent alkalinitrat, h) 0,01 til 0,3 vægtprocent alkanolamin og i) 0,005 til 0,3 vægtprocent ethoxyleret mercaptobenzimidazol.The foregoing advantages are obtained with the refrigerant having the characteristics set forth at the outset, when it is characterized in that it also contains alkaline nitrate, alkanolamine and ethoxylated mercaptobenzimidazole and further contains: a) 1.0 to 4.0% by weight of an alkali salt of boric acid, b) 0.03 to 0.3 weight percent alkali silicate, c) 0.05 to 1.0 weight percent alkali hydroxide, d) 0.03 to 0.2 weight percent benztriazole, e) 0.03 to 0.3 weight percent, optionally methylated nitrophenol or its alkali salt, f) 0.05 to 0.3 weight percent alkaline nitrite, g) 0.05 to 0.4 weight percent alkaline nitrate, h) 0.01 to 0.3 weight percent alkanolamine, and i) 0.005 to 0.3 weight percent ethoxylated mercaptobenzimidazole.
15 En særlig foretrukket udførelsesform for det frosthindrende, korrosionshæmmende middel ifølge opfindelsen har følgende sammensætning: a) 2,5 til 3,5 vægtprocent borax eller b) 1,3 til 1,8 vægtprocent dinatriumtetraborat, 20 c) 0,05 til 0,1 vægtprocent benztriazol, d) 0,05 til 0,15 vægtprocent picrinsyre, e) 0,10 til 0,20 vægtprocent natriumnitrit, f) 0,20 til 0,30 vægtprocent kaliumnitrat, g) 0,05 til 0,15 vægtprocent natriummetasilikatpentahydrat, 25 h) 0,05 til 0,15 vægtprocent triethanolamin, i) 0,01 til 0,2 vægtprocent ethoxyleret mercaptobenzimidazol og k) 0,1 til 0,5 vægtprocent natriumhydroxid.A particularly preferred embodiment of the antifreeze, corrosion inhibitor of the invention has the following composition: a) 2.5 to 3.5 weight percent borax or b) 1.3 to 1.8 weight percent disodium tetraborate, c) 0.05 to 0; (D) 0.05 to 0.15 weight percent picric acid, e) 0.10 to 0.20 weight percent sodium nitrite, f) 0.20 to 0.30 weight percent potassium nitrate, g) 0.05 to 0.15 weight percent sodium metasilicate pentahydrate, 25 h) 0.05 to 0.15 weight percent triethanolamine, i) 0.01 to 0.2 weight percent ethoxylated mercaptobenzimidazole, and k) 0.1 to 0.5 weight percent sodium hydroxide.
Særlig god beskyttelse af jern og ikke-jernholdige metaller kan 30 opnås ved at tilsætte fra 0,005 til 0,3 vægtprocent, fortrinsvis fra 0,01 til 0,2 vægtprocent, mercaptobenztriazol, fortrinsvis natriummercapto-benzthiazol, til det frosthindrende korrosionshæmmende middel ifølge opfindelsen.Particularly good protection of iron and non-ferrous metals can be obtained by adding from 0.005 to 0.3% by weight, preferably from 0.01 to 0.2% by weight, mercaptobenztriazole, preferably sodium capaptobenzothiazole, for the antifreeze anti-corrosion agent of the invention.
Hvis det frosthindrende korrosionshæmmende middel ifølge opfin-35 delsen anvendes i høje koncentrationer, kan en tilsætning af natrium-hexafluorsilikat og/eller blynitrat i mængder på fra 0,001 til 0,3, fortrinsvis fra 0,01 til 0,05 vægtprocent, være fordelagtig.If the antifreeze corrosion inhibitor of the invention is used at high concentrations, the addition of sodium hexafluorosilicate and / or lead nitrate in amounts of from 0.001 to 0.3, preferably from 0.01 to 0.05% by weight, may be advantageous.
De frosthindrende korrosionshæmmende midler ifølge opfindelsen kan også indeholde antiskummidler, f.eks. silikonevæske, polyether eller tributylphosphat.The antifreeze anti-corrosion agents of the invention may also contain anti-foaming agents, e.g. silicone liquid, polyether or tributyl phosphate.
4 1499604 149960
Det er sandt, at tæring i kølesystemer bedst forebygges ved udformningsforanstaltninger, men i en i vis udstrækning findes der den mulighed at reducere tæringen ved tilsætninger til den frosthindrende blanding. I den forbindelse har det vist sig, at natriumsaltet af en 5 copolymer af maleinsyreanhydrid og methylvinylether og også monoeller diphosphorsyreester af tributylphenyltetraglycolether er egnede til det frosthindrende korrosionshæmmende middel ifølge opfindelsen.It is true that corrosion in refrigeration systems is best prevented by design measures, but to a certain extent there is the possibility of reducing corrosion by additions to the antifreeze mixture. In this connection, it has been found that the sodium salt of a copolymer of maleic anhydride and methyl vinyl ether and also mono or diphosphoric acid ester of tributylphenyl tetraglycol ether are suitable for the antifreeze anti-corrosion agent of the invention.
Hvor som helst, alkaliforbindelser er nævnt, er natrium- eller kaliumforbindelser de foretrukne.Wherever alkali compounds are mentioned, sodium or potassium compounds are preferred.
10 Fortrukne alkalisalte af borsyre er borax, dinatriumtetraborat eller natri ummetaborat.Preferred alkali salts of boric acid are borax, disodium tetraborate or sodium methaborate.
Den foretrukne nitrophenol er picrinsyre. Andre vandopløselige og glycolopløselige alkylnitrophenolforbindelser kan imidlertid også anvendes, i hvilket tilfælde det hovedsagelig er methyl, der er på tale, 15 som alkylsubstituenten. Eksempler herpå er phenolforbindelser med op til 3 nitrogrupper og op til 3 methylgrupper, navnlig o-nitrophenoler, m-nitrophenoler, p-nitrophenoler, 2,4-dinitrophenol er, 2,6-dinitro- phenoler, 2,4,6-trinitrophenoler, nitrocresoler, dinitrocresoler, trinitrocresoler, mono-nitroxylenoler, dinitroxylenoler og trinitroxyleno-20 ler.The preferred nitrophenol is picric acid. However, other water-soluble and glycol-soluble alkylnitrophenol compounds can also be used, in which case it is mainly methyl, which is the case, as the alkyl substituent. Examples are phenolic compounds having up to 3 nitro groups and up to 3 methyl groups, in particular o-nitrophenols, m-nitrophenols, p-nitrophenols, 2,4-dinitrophenols, 2,6-dinitrophenols, 2,4,6-trinitrophenols , nitrocresols, dinitrocresols, trinitrocresols, mono-nitroxylenols, dinitroxylenols and trinitroxylenols.
Foretrukne al kanolaminer er trial kanolaminer, såsom triethanolamin og tripropanolamin. Alkoxyalkanolaminer kan også anvendes.Preferred all canola amines are trial canola amines such as triethanolamine and tripropanolamine. Alkoxyalkanolamines may also be used.
Alkalihydroxidet tilsættes fortrinsvis i form af en 50% opløsning i vand til den frosthindrende blanding. Det vand, der anvendes til dette, 25 kan være det samme som virker som opløser for denne og andre komponenter. Der anvendes et minimum af vand til opnåelse af de bedste resultater.The alkali hydroxide is preferably added in the form of a 50% solution in water to the antifreeze mixture. The water used for this may be the same which acts as a solver for this and other components. A minimum of water is used to achieve the best results.
Det ethoxylerede mercaptobenzimidazol er fortrinsvis et reaktionsprodukt af omsætningen mellem mercaptobenzimidazol og ethylenoxid, 30 hvilket produkt har fra 5 til 10 ehtylenoxidgrupper pr. molekyle. Det gennemsnitlige antal ethoxy-enheder pr. molekyle i et typisk produkt, som også anvendtes i eksemplerne, beløber sig til ca. 8. Denne ethoxylerede mercaptobenzimidazol har endvidere følgende fysiske egenskaber:The ethoxylated mercaptobenzimidazole is preferably a reaction product of the reaction between mercaptobenzimidazole and ethylene oxide, which product has from 5 to 10 ethylene oxide groups per liter. molecule. The average number of ethoxy units per molecule in a typical product which was also used in the examples amounts to approx. 8. This ethoxylated mercaptobenzimidazole also has the following physical properties:
35 Størkningspunkt under -17°C35 Solidification point below -17 ° C
Kogepunkt 205°CBoiling point 205 ° C
Viskositet ved 20°C 1,946 x 10-3 m2/sViscosity at 20 ° C 1.946 x 10 -3 m2 / s
Densitet ved 20°C 1,19 g/cm3Density at 20 ° C 1.19 g / cm3
Foretrukne 1,2-alkylenglycoller er ethylen- og propylenglycol.Preferred 1,2-alkylene glycols are ethylene and propylene glycol.
5 1499605 149960
De efterfølgende eksempler illustrerer opfindelsen. Følgende blån-dinger blev fremstillet: EKSEMPEL 1 5 Borax 3,00 vægtprocent 1.2.3- benztriazol 0,05 vægtprocentThe following examples illustrate the invention. The following blends were prepared: EXAMPLE 1 Borax 3.00% by weight 1.2.3- benztriazole 0.05% by weight
Picrinsyre 0,09 vægtprocentPicric acid 0.09% by weight
Natriumnitrit 0,10 vægtprocentSodium nitrite 0.10% by weight
Kaliumnitrat 0,25 vægtprocent 10 Natriummetasilikatpentahydrat 0,10 vægtprocentPotassium nitrate 0.25 weight percent Sodium metasilicate pentahydrate 0.10 weight percent
Triethanolamin 0,10 vægtprocentTriethanolamine 0.10% by weight
Natriumhydroxidopløsning (50%) 0,80 vægtprocentSodium hydroxide solution (50%) 0.80% by weight
Ethoxyleret mercaptobenzimidazol 0,10 vægtprocentEthoxylated mercaptobenzimidazole 0.10% by weight
Vand 0,50 vægtprocent 15 Ethylenglycol 94,91 vægtprocent EKSEMPEL 2Water 0.50% by weight Ethylene Glycol 94.91% by weight EXAMPLE 2
Dinatriumtetraborat 1,59 vægtprocentDisodium tetraborate 1.59% by weight
Picrinsyre 0,09 vægtprocent 20 1,2,3-benztriazol 0,05 vægtprocentPicric acid 0.09 wt% 1,2,3-benztriazole 0.05 wt%
Natriumnitrit 0,10 vægtprocentSodium nitrite 0.10% by weight
Kaliumnitrat 0,25 vægtprocentPotassium nitrate 0.25% by weight
Natriummetasilikatpentahydrat 0,10 vægtprocentSodium metasilicate pentahydrate 0.10% by weight
Natriumhydroxidopløsning (50%) 0,60 vægtprocent 25 Triethanolamin 0,10 vægtprocentSodium hydroxide solution (50%) 0.60 wt% Triethanolamine 0.10 wt%
Ethoxyleret mercaptobenzimidazol 0,10 vægtprocentEthoxylated mercaptobenzimidazole 0.10% by weight
Ethylenglycol 97,02 vægtprocent EKSEMPEL 3 30 Dinatriumtetraborat 1,59 vægtprocentEthylene glycol 97.02% by weight EXAMPLE 3 Disodium tetraborate 1.59% by weight
Picrinsyre 0,09 vægtprocent 1.2.3- benztriazol 0,05 vægtprocentPicric acid 0.09 wt% 1.2.3- benztriazole 0.05 wt%
Natriumnitrit 0,10 vægtprocentSodium nitrite 0.10% by weight
Kaliumnitrat 0,25 vægtprocent 35 Natriummetasilikatpentahydrat 0,10 vægtprocentPotassium nitrate 0.25 wt.% Sodium metasilicate pentahydrate 0.10 wt.%
Triethanolamin 0,10 vægtprocentTriethanolamine 0.10% by weight
Natriumhydroxidopløsning (50%) 0,60 vægtprocentSodium hydroxide solution (50%) 0.60% by weight
Ethoxyleret mercaptobenzimidazol 0,09 vægtprocentEthoxylated mercaptobenzimidazole 0.09% by weight
Natriummercaptobenzthiazol 0,01 vægtprocentSodium capaptobenzthiazole 0.01% by weight
Ethylenglycol 97,02 vægtprocent 6 149960Ethylene glycol 97.02% by weight 6 149960
Til sammenligning fremstilledes følgende kendte antifrostblandinger: Sammenlignende blanding 1 (svarende til DE 11 54 976)For comparison, the following known antifreeze compositions were prepared: Comparative Blend 1 (corresponding to DE 11 54 976)
Borax 1,0 vægtprocent 5 Natriumnitrit 0,35 vægtprocentBorax 1.0% by weight 5 Sodium nitrite 0.35% by weight
Natriumnitrat 0,30 vægtprocentSodium nitrate 0.30% by weight
Natriumbenzoat 2,25 vægtprocentSodium benzoate 2.25% by weight
Natriummetasilikat 0,03 vægtprocent 1,2,3-benztriazol 0,07 vægtprocent 10 Ethylenglycol 96,00 vægtprocentSodium metasilicate 0.03% by weight 1,2,3-benztriazole 0.07% by weight Ethylene glycol 96.00% by weight
Sammenlignende blanding 2 (svarende til DE 14 92 522, eksempel 5)Comparative mixture 2 (corresponding to DE 14 92 522, example 5)
Borax 3,50 vægtprocent 15 Benztriazol 0,10 vægtprocentBorax 3.50% by weight Benztriazole 0.10% by weight
Natriummetasilikatpentahydrat 0,10 vægtprocentSodium metasilicate pentahydrate 0.10% by weight
Picrinsyre 0,10 vægtprocentPicric acid 0.10% by weight
Natriumnitrit 1,56 vægtprocentSodium nitrite 1.56% by weight
Vand 1,56 vægtprocent 20 Natriumhydroxid 0,62 vægtprocentWater 1.56% by weight 20 Sodium Hydroxide 0.62% by weight
Ethylenglycol 93,92 vægtprocentEthylene glycol 93.92% by weight
Afprøvning for korrosionsbeskyttelse udførtes ved forskellige undersøgelsesmetoder, nemlig: 25 1. ASTM D 1384-70 (1975) samt modifikationer af denne metode med hensyn til prøvemetallerne, antifrostblandingskoncentration og temperatur.Testing for corrosion protection was carried out by various test methods, namely: 1. ASTM D 1384-70 (1975) as well as modifications of this method with respect to the sample metals, antifreeze mixture concentration and temperature.
2. EMPA korrosionsprøve og modifikationer af denne metode med hensyn til prøvemetaller og koncentrationerne af antifrostmiddel.2. EMPA corrosion test and modifications of this method with respect to sample metals and antifreeze agent concentrations.
30 3. FVV Retningslinier for afprøvning af køleadditivers egnethed til kølevæsker til indre forbrændingsmotorer.30 3. FVV Guidelines for testing the suitability of refrigerant additives for coolants for internal combustion engines.
Resultaterne af de sammenlignende forsøg viser, at de frosthindrende korrosionshæmmende midler ifølge opfindelsen (eksemplerne 1, 2 35 og 3) overalt falder bedst ud, navnlig ved lave koncentrationer af anti-frostblanding, og også over for specielle aluminiumlegeringer (jvf. tabellerne 1-6). Det fremgår således, at de frosthindrende korrosionshæmmende midler ifølge opfindelsen er særligt effektive til at reducere korrosionen af aluminium og specielle aluminiumlegeringer samtidig med, T49960 7 at de udøver en effektiv hæmning på korrosionen af kobber, loddemetal, messing, stål og støbejern. Af tabel 7 fremgår de fordele, som kan opnås ved en tilsætning af blynitrat eller natriumhexafluorsilikat ifølge opfindelsen; tabel 8 giver de tilsvarende resultater med antitæringsfor-5 bindeiser.The results of the comparative experiments show that the anti-freeze corrosion inhibitors of the invention (Examples 1, 2 35 and 3) everywhere are most pronounced, especially at low concentrations of anti-freeze mixture, and also against special aluminum alloys (cf. Tables 1-6 ). Thus, it is seen that the antifreeze anti-corrosion agents of the invention are particularly effective in reducing the corrosion of aluminum and special aluminum alloys at the same time as they exert an effective inhibition on the corrosion of copper, solder, brass, steel and cast iron. Table 7 shows the advantages that can be obtained from the addition of lead nitrate or sodium hexafluorosilicate according to the invention; Table 8 gives the corresponding results with anti-tethering compounds.
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Pd Ή Ρ Ρ ·Η Ρ ε ·Η 60 go 3-5 60 + +14-1 33 >. Ρ d Ο Ρ d Β 3® 33 Ρ ·· Pd ·· -Η -Η ·· μ ο ο cop co&sxPdco 60 ρ comP03dP>> μ g -η 60ΡΡΟΡ dd ο ο© to CI3 i—I ftj 3 i—I 60© P i—1 Ή 10 P©P3PPd up© o>MoajB-HO do ο ω ο μ aj ο o ή 03 ft ρ ft > 3 w ft >μ ft oo ft o ft© ρ > ρ ε ρ ή s ·η μ ε -©. a d ε ε μ ε ft •η ρ ο©ου©μοο μ ο ο -η ο >» ο ο w το Ο 60 coo>>tnoPdcn ftp ω μ μ ρ ρ wo Ο © a © ρρ Pd ρ 3 Ρ Pd Ρ Ρ PdjypdOPpd© 2 ^ £> f4 Ο © M©d+i M C *d WPWftWfdftPd Ή Ρ Ρ · Η Ρ ε · Η 60 go 3-5 60 ++ 14-1 33>. ® d Ο Ρ d Β 3® 33 Ρ ·· Pd ·· -Η -Η ·· μ ο ο cop co & sxPdco 60 ρ comP03dP >> μ g -η 60ΡΡΟΡ dd ο ο © to CI3 i — I ftj 3 i — I 60 © P i — 1 Ή 10 P © P3PPd up © o> MoajB-HO do ο ω ο μ aj ο o ή 03 ft ρ ft> 3 w ft> μ ft oo ft o ft © ρ> ρ ε ρ ή s · Η μ ε - ©. ad ε ε μ ε ft • η ρ ο © ου © μοο μ ο -η ο> »ο ο w το Ο 60 coo >> tnoPdcn ftp ω μ μ ρ ρ wo wo © a © ρρ Pd ρ 3 Ρ Pd Ρ Ρ PdjypdOPpd © 2 ^ £> f4 Ο © M © d + i MC * d WPWftWfdft
Claims (3)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19792938868 DE2938868C2 (en) | 1979-09-26 | 1979-09-26 | Antifreeze for coolants |
DE2938868 | 1979-09-26 |
Publications (3)
Publication Number | Publication Date |
---|---|
DK394780A DK394780A (en) | 1981-03-27 |
DK149960B true DK149960B (en) | 1986-11-03 |
DK149960C DK149960C (en) | 1987-07-06 |
Family
ID=6081842
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DK394780A DK149960C (en) | 1979-09-26 | 1980-09-17 | ANTI-FROZEN, CORROSION AGENT |
Country Status (8)
Country | Link |
---|---|
AT (1) | AT376996B (en) |
BE (1) | BE885432A (en) |
CH (1) | CH645128A5 (en) |
DE (1) | DE2938868C2 (en) |
DK (1) | DK149960C (en) |
FR (1) | FR2465773B1 (en) |
GB (1) | GB2059432B (en) |
NL (1) | NL8005093A (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA1155646A (en) * | 1980-05-19 | 1983-10-25 | Stanley T. Hirozawa | Antifreeze compositions containing inhibitors to prevent localized corrosion of aluminum and solder alloy corrosion |
DE3824672C1 (en) * | 1988-07-20 | 1990-04-05 | Deutsche Bp Ag, 2000 Hamburg, De | |
ES2103888T3 (en) * | 1992-04-06 | 1997-10-01 | Texaco Services Europ Ltd | CORROSION INHIBITING ANTIFREEZE FORMULATIONS. |
DE10302093A1 (en) * | 2003-01-21 | 2004-07-29 | Basf Ag | Heat carrier liquid concentrate based on glycol or diluted with water, used in solar plant, e.g. in direct contact with glass, contains aliphatic amine, silicate, triazole or thiazole corrosion inhibitor, molybdate and hard water stabilizer |
US20080230740A1 (en) * | 2003-11-13 | 2008-09-25 | Vladisav Milovanovic | Nontoxic Watery Solution Against Freezing and Corrosion and the Regenerator For the Utilized Antifreeze |
DE102010002341A1 (en) * | 2010-02-25 | 2011-08-25 | Behr GmbH & Co. KG, 70469 | Heat exchangers and components for automotive cooling circuits |
CN113930221B (en) * | 2021-10-27 | 2023-12-26 | 常州市鑫光新材料科技有限公司 | Special coolant for diesel locomotive |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL283904A (en) | 1961-10-04 | |||
DE1492522C3 (en) | 1967-03-23 | 1976-01-02 | Deutsche Bp Ag, 2000 Hamburg | Antifreeze for coolants |
-
1979
- 1979-09-26 DE DE19792938868 patent/DE2938868C2/en not_active Expired
-
1980
- 1980-09-10 NL NL8005093A patent/NL8005093A/en not_active Application Discontinuation
- 1980-09-17 DK DK394780A patent/DK149960C/en not_active IP Right Cessation
- 1980-09-22 GB GB8030540A patent/GB2059432B/en not_active Expired
- 1980-09-24 CH CH715780A patent/CH645128A5/en not_active IP Right Cessation
- 1980-09-24 FR FR8020502A patent/FR2465773B1/en not_active Expired
- 1980-09-26 BE BE0/202258A patent/BE885432A/en not_active IP Right Cessation
- 1980-09-26 AT AT481880A patent/AT376996B/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
GB2059432A (en) | 1981-04-23 |
BE885432A (en) | 1981-03-26 |
CH645128A5 (en) | 1984-09-14 |
ATA481880A (en) | 1984-06-15 |
NL8005093A (en) | 1981-03-30 |
GB2059432B (en) | 1984-04-18 |
DK394780A (en) | 1981-03-27 |
DK149960C (en) | 1987-07-06 |
AT376996B (en) | 1985-01-25 |
DE2938868A1 (en) | 1981-04-02 |
DE2938868C2 (en) | 1982-12-02 |
FR2465773A1 (en) | 1981-03-27 |
FR2465773B1 (en) | 1985-09-06 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PBP | Patent lapsed |