SE200889C1

SE200889C1 -

Info

Publication number: SE200889C1
Authority: SE
Publication date: 1965-01-01

Description

Uppfinnare: P J Ralfsnider Prioritet begard Iran den 9 juni 1959 (USA) Foreliggande uppfinning avser ett satt att forhindra korrosion och narmare bestdmt korrosion av metallfdremal under anvandande av forpacknings- eller mnslagsmaterial, exempelvis cellulosahaltiga &linen och cellulosaderivat, som aro Overdragna, impregnerade eller pa annat satt behandlade med ett i det foljande narmare heskrivet, i angfas verksamt korrosionsskyddande Vid lagring, hantering, transport och forvaring av fOremal med metalliska eller metallhaltiga ytor, sarskilt foremal av olika slags stal, aluminium, koppar och massing, är det ofta nOdvandigt att forhindra korrosion av metallerna. Habits ha de olika metoder men for detta andarnal begagnat sig av innefattat anvandandet av relativt dyra, i angfas verksamma korrosionsinhibitorer, sasom aminkarboxylater eller aminitrater. Andra anvanda medel ha varit att direkt overdraga den metall, som skall skyddas, med oljeartade kompositioner innehallande manga olika slap korrOionsinhibiitorer, som aTOi verksamma endast vid direkt beroring. I en del fall ha oljekompositioner anvants, vilka innehallit korrosionsinhibitorer avsedda att fiirflyktigas genom varme och att darvid bilda en korrosionsforhindrande atmosfar over olj an, vilken atmosfar hâllits innesluten mellan metallvaggar, I. ex. i ett vevhus eller liknande. Nackdelarna och begrhnsningen med ett sadant system irises utan vidare. Forst och framst mdste oljeartade korrosinsskyddsmedel dar%land oljekompositioner i de fiesta fall avlagsnas frail de metallforemal, som skola skyddas, innan dessa anvandas. For det andra maskerar eller reducerar narvaron av oljor verkan av en eventuellt i desamma forhandenvarande korrosionsinhibitor. I sjalva ver ket är det ofta nodvAndigt att »aktivera» korrosionsinhibitorer i smorjolj OT genem införande andra material, sdsom svavelhaltiga foreningar, fenoliska foreningar och/eller polykarbonsyror, dessas amider eller estrar. Alla dessa modifikationer Oka naturligtvis kostnaden for den korrosionsskyddande kombinationen, och kostnaden Ras ytterligare genom behovet att avlagsna oljan eller det oljeartade medlet Fran metallf8remdlet innan detta an-Andes. Inventor: PJ Ralfsnider Priority Requested Iran June 9, 1959 (USA) The present invention relates to a method of preventing corrosion and more specifically corrosion of metal feedstocks using packaging or packaging materials, such as cellulosic & linen and cellulose derivatives, which are coated, impregnated or otherwise When treated, handling, transporting and storing objects with metallic or metal-containing surfaces, especially molds of various kinds of steel, aluminum, copper and pulp, it is often necessary to prevent corrosion. of the metals. Habits have the various methods but for this purpose have taken advantage of including the use of relatively expensive, in corrosive effective corrosion inhibitors, such as amine carboxylates or aminitrates. Other means of use have been to directly coat the metal to be protected with oily compositions containing many different slap corrosion inhibitors, which are effective only in direct contact. In some cases, oil compositions have been used which have contained corrosion inhibitors intended to be volatilized by heat and thereby to form an anti-corrosion atmosphere above the oil, which atmosphere is kept enclosed between metal walls, e.g. in a crankcase or the like. The disadvantages and limitations of such a system are irises without further ado. First and foremost, oily corrosive preservatives, where in most cases oil compositions are removed from the metal molds to be protected before use. Second, the presence of oils masks or reduces the action of a possible corrosion inhibitor present in them. In fact, it is often necessary to "activate" corrosion inhibitors in lubricating oil by introducing other materials, such as sulfur-containing compounds, phenolic compounds and / or polycarboxylic acids, their amides or esters. All of these modifications, of course, increase the cost of the anti-corrosion combination, and the cost is further reduced by the need to remove the oil or oily agent from the metal prior to use.

Partiellt eller fullstandigt forpackade metalldelar anbringas vanligtvis i hus, askar, cm-slag ,eller behdllare under &Adana betingelser, att vattenanga och luft antingen dro ndrvarande eller inkomma till metallforemalen, dá dessa forpackas, eller att vattenanga och luft trhnga in i holjet genom dettas vaggar efter forpackningen. Partially or completely packed metal parts are usually placed in housings, boxes, cams, or containers under & Adana conditions, that water vapor and air either drip or enter the metal form, when these are packaged, or that water vapor and air penetrate into the housing through its cradles. after packaging.

Det är ett andamal med foreliggande upp, finning att undvika de ovan angivna nackdelarna och andra sadana samt att astadkomma nya produkter eller material, vilka kunna anvandas sasom material for eller vid inslagning och fOrpackning, och vilka fOrma fOrhindra korrosion av metalldelar, som lagrats eller far, varas i behallare eller fOrpackningar och/ eller i holj en innehallande de nya materialen. It is an object of the present invention to avoid the above disadvantages and the like and to provide new products or materials which can be used as materials for or in wrapping and packaging, and which prevent corrosion of metal parts which have been stored or removed. , be stored in containers or packaging and / or in a container containing the new materials.

Enligt uppfinningen har det visat sig, att kaprinsyra avsatt ph eller inford i ett i huvudsak fast (foretradesvis fibrost) forpackningsmaterial verkar sasom korrosionsinhibator for metallforemal, som omgivits med eller in-. slagits i materialet, vid temperatur mellan c :a —1° C och ,c:a 43° C. Vid hogre temperaturer gar inhibitorverkan av skal, som icke faststallts, forlorad. Detta beror icke pa bristande angtryck, dit detta has kaprinsyra givetvis är idgre Mom omraciet frill —1° C till 43° C 2— — exempelvis vid 65° C. Enligt uppfinningen har det vidare befunnits, att kaprinsyra jamfort med andra fettsyror icke endast är en billig, i angfas verksam korrosionsinhibitor utan jam- fort med sina narmaste homologer aven ãr det verksammaste, i angfas korrosionsmotverkan- de medlet vid lagring och farvaring av metall- normal vid vanliga temperaturer. Enligt uppfinningen kan vidare det material, varpa kaprinsyran avsattes eller van i den inf8res, modifieras genom narvaro av ett aminkarboxylat, foretradesvis ett salt av en amin och en fettsyra med 6-12 kolatomer per molekyl. According to the invention it has been found that capric acid deposited ph or introduced into a substantially solid (preferably fibrous) packaging material acts as a corrosion inhibitor for metal molds surrounded by or in-. beaten in the material, at a temperature between about -1 ° C and, about 43 ° C. At higher temperatures, the inhibitory effect of shells, which have not been determined, is lost. This is not due to a lack of pressure, where this capric acid has of course been better than the range of -1 ° C to 43 ° C 2 ° - for example at 65 ° C. According to the invention it has further been found that capric acid compared with other fatty acids a cheap, in Angfa's effective corrosion inhibitor without comparing with its closest homologues is also the most effective, in Angfa's anti-corrosion agent when storing and staining metal normal at normal temperatures. Furthermore, according to the invention, the material on which the capric acid was deposited or used to be introduced can be modified by the presence of an amine carboxylate, preferably a salt of an amine and a fatty acid having 6-12 carbon atoms per molecule.

Uppfinnigen kan realiseras eller tillampas pa ett antal olika salt, vilka avvika frail var- andra .endast i fraga om detaljer. Salunda kan kaprinsyra inforas genom att man impregnerar olika omslags- eller forpackningsmaterial, shsom papper, cellofan, polyetylenfilmer, kor- rugerad board, tyger oak liknande, vilka antingen kunna vara partiellt porosa eller absorberande eller helt ogenomtrangliga. Foretradesvis valjer man ett fast material, som har fibers truktur, sä alt kaprinsyran kan absor- beras mellan de individuella fibrerna i baror-ganet. Da. det barande materialet sjalvt icke är sarskilt absorberande, kan det med fOrdel overdragas istallet for att impregneras med syran. The invention can be realized or applied to a number of different salts, which differ from each other only in detail. Thus, capric acid can be introduced by impregnating various wrapping or packaging materials, such as paper, cellophane, polyethylene films, corrugated board, fabrics or the like, which can be either partially porous or absorbent or completely impermeable. Preferably, a solid material is chosen which has a fiber structure so that the capric acid can be absorbed between the individual fibers in the bar organ. Yes. the bearing material itself is not particularly absorbent, it can advantageously be coated instead of being impregnated with the acid.

En av fOrdelarna med uppfinningen ar obundenheten av omgivning, van i syran verkar sasom h5geffektiv korrosionsinhibitor. Sa t: ex. an det i samband med manga typer av i finglas verksamma korrosionsinhibitorer nod- vandigt att omslaget dr antingen neutralt eller svagt basiskt. Sa ar icke faillet med kaprinsyra. Vidare flackas eller till och med korro- deras manga material, sasont massing, och koppar, av aminer. Foljaktligen aro aminer eller aminnitriter icke alltid tillfredsstallan- de for forhindrande av korrosion av sadana amnen. Kaprinsyran a andra sidan har visat sig utgora ett fullt tillfredsstallande korrosionsskydd for kopparhaltiga metaller liksom for jarnb.altiga sadana, sasom olika slag av stal och jam. One of the advantages of the invention is the independence of the environment, used in the acid acts as a highly effective corrosion inhibitor. Sa t: ex. In connection with many types of corrosion inhibitors active in fine glass, it is necessary for the cover to be either neutral or slightly basic. This is not the case with capric acid. Furthermore, many materials, such as pulp, and copper, are flattened or even corroded by amines. Accordingly, amines or amine nitrites are not always satisfactory for preventing corrosion of such substances. The capric acid, on the other hand, has been shown to provide a fully satisfactory corrosion protection for copper-containing metals as well as for ferrous metals, such as various kinds of steels and jams.

Respreseutativa exempel pa fasta material, sam for det angivna andama.let lampa sig att anvandas i samband med kaprinsyra, am pap- per, textiltyger, sasom, bomulls, ylle- eller si- dentyger, tra, modifierat eller forstyvat pap-. per, sasom kartong, board och laminerat pap- per; syntetiska fibrer .eller spunna textilier, nylon och polyetylen; asbest, trakol, aktiverat sasom konstsilke, polye.strar, polyamider, trakol, aluminiumoxidgel och silikagel, vilka alla kunna impregneras med kaprinsyra och anvandas for uppfinningens andamal. Ett god- tyckligt ark- eller remsformigt material fram.- stallt av de ovannamnda fiberamnena kan anvandas for andamalet. Impregnering eller avsattning av kaprinsyra ph de fasta materialen kan ske genom vatning, neddoppning eller indrankning av materialet med en dispersion eller lOsning av syran, fOretradesvis i ett rela- tivt lattflyktigt organiskt losningsmedel.. Impregneringen kan Oven ske genom att fOrdela en smalta av kaprinsyra med eller utan smaltpunktsnedsattande medal Over ytan av ett fast barmaterial. De fibrosa materialen kunna Oven impregneras genom beroring med kaprinsyr. ahngor. Representative examples of solid materials, as well as for the stated purpose, may be used in connection with capric acid, am paper, textile fabrics, such as, cotton, wool or silk fabrics, wood, modified or stiffened cardboard. per, such as cardboard, board and laminated paper; synthetic fibers, or spun textiles, nylon and polyethylene; asbestos, trachol, activated as artificial silk, polyesters, polyamides, trachol, alumina gel and silica gel, all of which can be impregnated with capric acid and used for the purposes of the invention. An arbitrary sheet or strip-shaped material produced from the above-mentioned fiber blanks can be used for the purpose. Impregnation or deposition of capric acid ph the solid materials can be done by watering, dipping or soaking the material with a dispersion or dissolving the acid, preferably in a relatively volatile organic solvent. or without melting point reducing medal Over the surface of a solid bar material. The fibrous materials can also be impregnated by contact with capric acid. ahngor.

I manga fall dr det fordelaktigt att behandla eller impregnera ett eller flera sldkt av ett papperslaminat med kaprinsyra och att ar- med framstalla ett slutligt laminat, som har yttre skikt, vilka aro hetydligt mindre porOsa eller genomtrangliga fOr inhibitorangor On de impregnerade laminaten, som kunna anvandaS i det inre av forpackningen eller an- bringas tatt intilI en korroderbar metall. I sa- dana fall kan det yttre skiktet utgoras av en metallfolie, sasom en tenn- eller aluminium- folie, foretradesvis av tilirOcklig tjocklek far att lake uppvis,a n.agra fina hal. Liknande resultat ha erhallits genom att overdraga ena sidan av ett rued kaprinsyra impregnerat pap-per med en vaxfilm. In many cases it is advantageous to treat or impregnate one or more layers of a paper laminate with capric acid and to thereby produce a final laminate which has outer layers which are significantly less porous or permeable to inhibitor yarns on the impregnated laminates which may used in the interior of the package or applied to a corrodible metal. In such cases, the outer layer may be formed of a metal foil, such as a tin or aluminum foil, preferably of sufficient thickness to be leached, a few fine slides. Similar results have been obtained by coating one side of a rued capric acid impregnated paper with a wax film.

Ett av de ovetrraskande forhallandena i samband med uppfinningen Or den olikhet, som visar sig foreligga mellan narbeslaktade lett- syror ifraga oni korrosionsskyddsverkan i angf as vid forangning fear" papper eller annat omslagsmaterial och den verkan man erhaller, dd. syrorna dispergeras i ett oljeartat medium. I sistnamnda fall Or det ernadda korrosions- skyddet i huvudsak detsamma for ett an- tal olika fettsyror, och knappast nfrgra olikheter visa sig mellan kaprinsyra och narlig- gande homologer. Da emellertid omgivningen Or i huvudsak »torr», dvs. da, vasenitigen ingen olj a eller annan: vatska Or narvarande, Or korrosionsskyddsverkan hos. kaprinsyra kritisk. Detta framgar av exempla", vid vilka kapronsyra och kaprylsyra jamte laurinsyra jamforas med kaprinsyra ifraga om korrosionskyddsverkan I angfas. Sasam data visa, accelerera kapronsyra och kaprylsyra i sjalva verket rostbildningen, medan laurins3rra (den narmast hogre homologen till kaprinsyra) endast har begransad effekt vid den. un- clersokta rostbildningen vid vanliga tempera-tuner. I jamforelse harmed befanns kaprin- syra, synnerligen effektiv f8r andamalet, da den metall, som skulle skyddas, utgjordes av jam, sf01, koppar eller massing. Uppfinningen Or foljaktligen baserad ph ovantade skillna- der mellan dessa syror i fly omgivning, som halt avviker fra'n shdana omgivningar, i vilka syrorna tidigare anvants. Forclelen med kaprinsyra: ligger icke endast i den stora effektiviteten i angfas utan Oven. dari, att donna syra Or mycket billigare On andra I angfas verksamma korrosionsinhibitorer, sasom aminnitriter eller aminkarboxylater. One of the surprising conditions in connection with the invention is the difference which is found to exist between closely related light acids in terms of the corrosion protection effect in the case of evaporation of paper or other wrapping material and the effect obtained, i.e. the acids are dispersed in an oily medium. In the latter case, the corrosion protection provided is essentially the same for a number of different fatty acids, and hardly any differences are found between capric acid and nearby homologues. no oil or other: liquid Or present, Or corrosion protection effect of capric acid critical. The same data show that caproic acid and caprylic acid actually accelerate the formation of rust, while lauric acid (the closest higher homologue to capric acid) has only a limited effect on it. unclare the rust formation at normal tempera-tuners. In comparison with this, capric acid was found to be particularly effective for the spirit, as the metal to be protected consisted of jam, sf01, copper or pulp. Accordingly, the invention is based on the above-mentioned differences between these acids in the escape environment, which content differs from those environments in which the acids were previously used. The advantage of capric acid: lies not only in the great efficiency of angfas but Oven. dari, to donna acid Or much cheaper On other I angfas effective corrosion inhibitors, such as amine nitrites or amine carboxylates.

Kaprinsyran befinnes vara verksam endast yid temperaturer mellan —1° C och c :a 43° C. Vid hogre temperaturer .dominera andra — L.3 2 Rostbildning 2Ingen rostbildning fenomen, och kaprinsyra utgor darvid icke flagon verksam inhibitor i angfas, medan flera av de ovannannida andra syrorna atminstone aro delvis verksamma. The capric acid is found to be effective only at temperatures between -1 ° C and about 43 ° C. At higher temperatures. Dominate others - L.3 2 Rust formation 2 the above other acids are at least partially active.

Nedanstdende exempel visa de skillnader, som erhallas vid anvandning av kaprinsyra och .dess homologer i .ett prov avsett att demonstrera relativa fiirmagan att forhindra koTrosion vid lagring mellan c:a — 1° C och c :a 43° C, sd.dan den kan forekornma vid forvaring av metallforemeal i varuhus och andra lokaliteter. The following examples show the differences obtained with the use of capric acid and its homologues in a sample intended to demonstrate the relative ability to prevent corrosion when stored between about 1 ° C and about 43 ° C, since then. may occur when storing metal foremeal in department stores and other locations.

Vid fOrsoket monteras en provbit av metal, len i ett block .av fenol-formaldhyd-harts och n:edhanges medelst ett glasror i en kolv 38 mm ovanfor en plattform med ett filtrerpapper, som är impregnerat med den inhibitor, som skall undersokas. Under plattformen, som är perforerad, finnes vatten, och hela apparaten placeras 16 timmar i en ugn av 38° C temperatur. Darefter infores isvatten i glasrOret ovanfor •och i beroring med metallbiten. Detta majliggor kondensering av vatten pa metal-lens yta. Apparaten iakttages/ darefter med 2 timmars intervaller. Isvattnet bytes varannan timme for att sakerstalla en kall kondenseringsyta pa metallen, medan denim befinner sig i den till 38° C uppvarmda ugnen. Nedan angivna data visa, att kaprinsyra har enasta'ende egenskaper shsom I dngfas verksam korrosionsinhibitor under dtrainstone 4 isvattenbyten. Data visa aven att dess ndrmaste homologer, dvs. kaprylsyra och kapronsyra, voro vardelosa, medan laurinsyra forhindrade rostbildning endast under 2 byten. Narvaron av metylaminkaprat i kaprinsyran medforde dvenledes fullstandigt korrosio.nsskydd I angfas. In the test, a test piece of metal is mounted in a block of phenol-formaldehyde resin and attached by means of a glass tube in a 38 mm flask above a platform with a filter paper impregnated with the inhibitor to be tested. Under the platform, which is perforated, there is water, and the whole appliance is placed in an oven at 38 ° C for 16 hours. Then ice water is introduced into the glass tube above • and in contact with the metal piece. This allows condensation of water on the surface of the metal. The device is observed / thereafter at 2 hour intervals. The ice water is changed every two hours to ensure a cold condensation surface on the metal, while denim is in the oven heated to 38 ° C. The data below show that capric acid has unique properties as an effective corrosion inhibitor in dngfas during dtrainstone 4 ice water changes. Data also show that its most homologous, ie. caprylic acid and caproic acid, were worthless, while lauric acid prevented rust formation only during 2 changes. The presence of methylamine caprate in the capric acid also resulted in complete corrosion protection.

Isvatten Iakttagelser Antal byten Ingen syra1Fullst. rostbildning C8-kaprylsyra2Nastan fullst. rost- bildning C6-kapronsyra2Nastan fullst. cost- bildning C6-pelargonsyra2Provet flackat C12-laurinsyra2Ingen rostbildning Undekylsyra2Fullst. rostbildning C-kaprinsyra4Ingen rostbildning C14-myristinsyra Kaprinsyra -I- metylaminkaprat Vid ovan relaterade fdrsök 15stes 4 gram av syran i 20 cm.3 isopropylalkohol. 0,5 cm3 av derma losning avsattes pa ett filtrerpapper med en diameter av 64 mm. Ice water Observations Number of changes No acid1Full. rust formation C8-caprylic acid2 Almost complete. rust formation C6-caproic acid2 Almost complete. cost formation C6-geranium acid2Sample flattened C12-lauric acid2No rust formation Lower cooling acid2Full. Rust formation C-capric acid4No rust formation C14-myristic acid Capric acid -I- methylamine caprate In the above related experiments 15stes 4 grams of the acid in 20 cm.3 isopropyl alcohol. 0.5 cm3 of this solution was deposited on a filter paper with a diameter of 64 mm.

Det är att fOredraga att den enligt uppfinningen anvanda mangden kaprinsyra iir tillrdcklig under en avsevard inhibitionsperiod for den speciella metal', som skall skyddas, och i den omgivning denna kommer att sig 1. Normalt innebar detta en kaprinsyramangd mellan c:a 0,0054 och 0,54 gram per kvadratcentimeter av forpacknings- eller omslagsmaterialet It is to be understood that the amount of capric acid used according to the invention is sufficient during a considerable period of inhibition for the particular metal to be protected, and in the environment this will be 1. Normally this meant an amount of capric acid between about 0.0054 and 0.54 grams per square centimeter of the packaging or wrapping material

Claims

Patent claim:

1. MU to prevent corrosion using a corrosion inhibitor effective in the said phase, characterized in that a metal surface is packaged in or surrounded by a packaging or wrapping material together with a sufficient amount of capric acid corrosion protection, and that the temperature of the packaged or the wrapped form is tilted between about -1 ° C and about 43 ° C.

2. A sheet according to claim 1, characterized in that the metal surface is ferrous and that the packaging or wrapping material is made of paper.

3. A column according to claim 1 or 2, characterized in that capric acid is used in an amount between about 0.0054 and. about 0.54 grams per square decimeter of packaging or wrapping material

Molds protected against corrosion in any of the ways stated in patent claims 1-3. Request Publications: U.S. Patent Nos. 2,848,298.