DK169079B1 - Essentially anhydrous agent for the laceration of blanks of easily corroded materials containing N-methyl-pyrrolidone, potassium hydroxide and an alcohol of 2-3 carbon atoms, and process for its preparation and use thereof. - Google Patents
Essentially anhydrous agent for the laceration of blanks of easily corroded materials containing N-methyl-pyrrolidone, potassium hydroxide and an alcohol of 2-3 carbon atoms, and process for its preparation and use thereof. Download PDFInfo
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- DK169079B1 DK169079B1 DK185491A DK185491A DK169079B1 DK 169079 B1 DK169079 B1 DK 169079B1 DK 185491 A DK185491 A DK 185491A DK 185491 A DK185491 A DK 185491A DK 169079 B1 DK169079 B1 DK 169079B1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D9/00—Chemical paint or ink removers
- C09D9/005—Chemical paint or ink removers containing organic solvents
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- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
- C11D7/02—Inorganic compounds
- C11D7/04—Water-soluble compounds
- C11D7/06—Hydroxides
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- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
- C11D7/22—Organic compounds
- C11D7/26—Organic compounds containing oxygen
- C11D7/261—Alcohols; Phenols
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- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
- C11D7/22—Organic compounds
- C11D7/32—Organic compounds containing nitrogen
- C11D7/3281—Heterocyclic compounds
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Description
i DK 169079 B1in DK 169079 B1
Den foreliggende opfindelse angår et i det væsentlige vandfrit middel til aflakering af emner af let korroderbare materialer, hvilket middel indeholder N-methyl-pyrrolidon, kaliumhydroxyd og en alkohol med 2-3 karbonatomer. Opfindel-5 sen angår tillige en fremgangsmåde til fremstilling af dette aflakeringsmiddel samt anvendelse af dette middel til aflakering af emner af let korroderbare metaller ved koldstrip-ning.The present invention relates to a substantially anhydrous agent for the laceration of blanks of easily corrosible materials, which contains N-methyl-pyrrolidone, potassium hydroxide and an alcohol of 2-3 carbon atoms. The invention also relates to a process for preparing this paint agent and to use this agent for the coating of articles of easily corroded metals by cold stripping.
Ved industrielle produktioner af de fleste brugsgen-10 stande fordres der en høj finish blandt andet i form af en fejlfri lakoverflade, der tillige skal have en farvenuance, der nøje svarer til en foreliggende farveprøve. Opfyldes disse fordringer ikke for den fremstillede genstand, må den omlakeres, hvis det er muligt og økonomisk gennemførligt, 15 ellers må den kasseres. Da især den sidste mulighed er en kostbar løsning, har der været stor interesse for at gøre en omlakering mulig, efter at den første lakering er blevet fjernet ved hjælp af et middel til opløsning og fjernelse af den hærdede lak.In industrial productions of most articles of use, a high finish is required, inter alia, in the form of a flawless lacquer surface, which must also have a color shade that closely corresponds to a present color sample. If these claims are not met for the manufactured item, it must be repainted, if possible and economically feasible, 15 otherwise it must be discarded. Since the latter option is a costly solution in particular, there has been a great interest in making a repainting possible after the first varnish has been removed by means of dissolving and removing the cured varnish.
20 En lakering kan fjernes ved kemiske, termiske eller mekaniske aflakeringsmetoder. De to sidstnævnte er ikke økonomiske og kan absolut ikke finde anvendelse i forbindelse med en vigtig materialegruppe, nemlig aluminium, der ikke modstår den termiske eller mekaniske belastning. Til kemisk 25 aflakering har klorerede kulbrinter i ren form, f.eks. me-thylenklorid, eller i sammenblanding med andre eventuelt aromatiske kulbrinter, fundet anvendelse i form af såkaldte koldstrippere. Anvendelse af klorerede kulbrinter til aflakeringsf ormål udgør imidlertid i praksis en alvorlig miljø-30 risiko, idet det er overordentlig vanskeligt at sikre det personale, der skal arbejde med disse opløsningsmidler, og det er bekosteligt at bortskaffe aflakeringsmidlerne efter brugen sammen med de opløste lakrester. Methylenklorid er desuden aggressivt over for aluminium, der som nævnt er et 35 meget anvendt materiale til produktion af almindelige brugsgenstande .A paint can be removed by chemical, thermal or mechanical paint methods. The latter two are not economical and absolutely cannot be used in connection with an important group of materials, namely aluminum, which does not withstand the thermal or mechanical load. For chemical coating, chlorinated hydrocarbons have a pure form, e.g. methylene chloride, or in admixture with other possibly aromatic hydrocarbons, found use in the form of so-called cold strippers. However, the use of chlorinated hydrocarbons for paint-off purposes poses a serious environmental risk in practice, as it is extremely difficult to secure the personnel to work with these solvents and it is costly to dispose of the paint-off agents after use with the dissolved paint residues. In addition, methylene chloride is aggressive against aluminum, which, as mentioned, is a widely used material for the production of ordinary utensils.
Fra USA-patentskrift nr. 3.551.204 kendes der opløsningsmidler, som er egnet til selektiv opløsning af polyure- 2 DK 169079 B1 than og visse epoxy-harpikssystemer, men som ikke angriber metaller eller de fleste øvrige polymersystemer. Opløsningsmidlerne, der er anvendelige til fjernelse af indkapslinger omkring elektroniske komponenter, således at komponenterne 5 kan genvindes uden at lide skade, er hovedsagelig baseret på en stærk, uorganisk base, f.eks. kaliumhydroxyd, og en alkohol med 2-4 karbonatomer, blandt hvilke alkoholer isopropa-nol er den foretrukne. Sammensætningen af det kendte opløsningsmiddel er ifølge patentkravet f.eks.: 0,1-3 vægt% vand, 10 3-7 vægt% kaliumhydroxyd, 90-96,9 vægt% af en alkohol med 2- 3 carbonatomer. I patentskriftet omtales det, at et yderligere indhold på maksimalt 5-10% af andre opløsningsmidler, såsom dimethylformamid, dimethylsulfoxid, methylenklorid eller methylpyrrolidon, kan tilføjes med henblik på opnåelse 15 af en ekstra opløsningseffekt. Tilstedeværelsen af sådanne opløsningsmidler påvirker imidlertid selektiviteten af opløsningsmidlet, men kan anvendes i mildt ætsende opløsningsmiddelkompositioner for visse polyestre. Det kendte opløsningsmiddel har en kraftig virkning overfor polyurethan, som 20 ifølge de beskrevne eksempler kan opløses fuldstændigt.From US Patent No. 3,551,204, solvents are known which are suitable for the selective solution of polyurethane and certain epoxy resin systems, but which do not attack metals or most other polymer systems. The solvents useful for removing enclosures around electronic components so that components 5 can be recovered without suffering damage are mainly based on a strong, inorganic base, e.g. potassium hydroxide, and an alcohol of 2-4 carbon atoms, of which alcohols isopropanol is preferred. The composition of the known solvent is according to the claim, for example: 0.1-3 wt.% Water, 10 3-7 wt.% Potassium hydroxide, 90-96.9 wt.% Of an alcohol having 2 to 3 carbon atoms. The patent discloses that a further content of a maximum of 5-10% of other solvents such as dimethylformamide, dimethylsulfoxide, methylene chloride or methylpyrrolidone may be added to obtain an additional dissolving effect. However, the presence of such solvents affects the selectivity of the solvent but can be used in mildly corrosive solvent compositions for certain polyesters. The known solvent has a strong effect against polyurethane, which according to the examples described can be completely dissolved.
I USA-patentskrift nr. 3.954.648 er der beskrevet af-lakeringsmidler, der er baseret på et alkalimetalhydroxyd i en mængde på 0,25-10 vægt% opløst i en blanding af 40-60 vægt% af et oxygeneret opløsningsmiddel, f.eks. en alkohol 25 med en kogepunktstemperatur over 100°C, og 40-60% af en højtkogende amin. Et sådant aflakeringsmiddel, baseret på triethylenglykol og triethanolamin, er i stand til ved ned-dypning i 7-30 minutter i et bad med en temperatur på 130-150°C at opløse et bredt sortiment af malinger og lakker i 30 en sådan grad, at de kan fjernes ved afskylning i vand. IU.S. Patent No. 3,954,648 discloses staining agents based on an alkali metal hydroxide in an amount of 0.25-10 wt% dissolved in a mixture of 40-60 wt% of an oxygenated solvent, f. eg. an alcohol 25 having a boiling point temperature above 100 ° C, and 40-60% of a high boiling amine. Such a stripping agent, based on triethylene glycol and triethanolamine, is capable of dissolving a wide range of paints and varnishes to such a degree by dipping for 7-30 minutes in a bath having a temperature of 130-150 ° C. that they can be removed by rinsing in water. IN
skriftet angives pyrrolidon som et eksempel på en anvendelig amin. Det er en ulempe ved det kendte aflakeringsmiddel, der er en såkaldt "varmstripper", at det for at opnå tilstrækkelig virkning skal opvarmes til en så høj temperatur som ca.The specification discloses pyrrolidone as an example of a useful amine. It is a disadvantage of the known stripping agent which is a so-called "hot stripper" that in order to obtain sufficient effect it must be heated to a temperature as high as approx.
35 150°C.35 ° C.
Det er opfindelsens formål at tilvejebringe et aflakerings- eller opløsningsmiddel, som udmærker sig ved ringe giftighed overfor det personale, der skal arbejde med det, DK 169079 B1 3 god opløsningsevne ved rumtemperatur og korrosionsfrihed over for aluminium, samt overlegen aflakeringseffekt i forhold til de fra US patentskrift nr. 3.551.204 kendte aflakeringsmidler. Aflakeringsmidlet skal desuden kunne regenere-5 res, således at der ikke vil kunne opstå problemer for brugeren med dets bortskaffelse.It is the object of the invention to provide a paint or solvent which is characterized by poor toxicity to the personnel to work with it, good solubility at room temperature and corrosion resistance to aluminum, as well as superior paint effect to those of U.S. Patent No. 3,551,204 known antifouling agents. The stripping agent must also be regenerated so that no problems can be encountered for the user with its disposal.
Dette formål opnås ifølge opfindelsen ved, at aflake-ringsmidlet er ejendommeligt ved det i den kendetegnende del af krav 1 angivne.This object is achieved according to the invention in that the leaching agent is peculiar to that of the characterizing part of claim 1.
10 Aflakeringsmidlet ifølge opfindelsen udmærker sig ved hurtigt og effektivt at fjerne et antal laktyper, der i vidt omfang anvendes ved lakering af industriprodukter, uden at aflakeringseffekten er opnået på bekostning af en høj grad af korrosionsfrihed, som også er til stede ved de beslægte-15 de, selektive opløsningsmidler af den ovenfor omtalte type.The stripping agent according to the invention is distinguished by the rapid and efficient removal of a number of varnishes which are widely used in the varnishing of industrial products, without the stripping effect being obtained at the expense of a high degree of corrosion, which is also present in the coating. the selective solvents of the type mentioned above.
Aflakeringsmidlet har en kraftig virkning ved almindelig rumtemperatur, og er af den grund ukompliceret at arbejde med under industrielle forhold.The stripping agent has a powerful effect at room temperature and is therefore uncomplicated to work with under industrial conditions.
Opfindelsen bygger på en erkendelse af, at et i al-20 mindelig sprit opløst alkali selv i forholdsvis ringe koncentration har en kraftigt nedbrydende virkning på et stort antal af de almindeligt anvendte malingssystemer, dersom malingen effektivt kvældes op, så alkalien kan komme til at angribe lakfilmens "kondensationsbindinger". En sådan op-25 kvældning tilvejebringes ved hjælp af metyl-pyrrolidon i koncentrationer, der er flere gange så store som dem, man tidligere har foreslået. Midlet består kun af få komponenter, og den enkle sammensætning muliggør en regenerering af aflakeringsmidlet, når det efter længere tids brug har mi-30 stet sin effektivitet, og/eller en stimulering af midlet under brugen, hvorved den effektive brugstid kan forøges meget væsentligt. Brugen af midlet er enkel, idet midlet, der er vandopløseligt, blot afvaskes efter aflakeringen, og en sådan afvaskning er miljømæssigt fuldt forsvarlig, da de i af-35 lakeringsmidlet indgående komponenter er nedbrydelige i det naturlige kredsløb. Ved opfindelsen er der på overraskende enkel måde ved videreudvikling udfra et kendt selektivt opløsningsmiddel fremkommet et generelt anvendeligt aflake- 4 DK 169079 B1 ringsmiddel med overordentlig lille giftighed, og ved hvis brug der ikke skal træffes andre forholdsregler end dem, der er almindelig anerkendt som nødvendige ved brug af brandfarlige væsker. Midlet udmærker sig ved en i det væsentlige li-5 ge så kraftig opløsningsevne ved rumtemperatur overfor de fleste malings- og laktyper som den kendte "varmstripper".The invention is based on the recognition that even in relatively low concentration, an alkali dissolved in alkaline liquor has a highly degrading effect on a large number of the commonly used paint systems if the paint is effectively swollen so that the alkali can attack the "condensation bonds" of the lacquer film. Such swelling is provided by methyl pyrrolidone at concentrations several times greater than those previously suggested. The agent consists of only a few components, and the simple composition enables regeneration of the paint agent when it has lost its effectiveness after prolonged use, and / or a stimulation of the agent during use, whereby the effective use time can be greatly increased. The use of the agent is simple in that the agent which is water-soluble is simply washed off after the paint, and such washing is environmentally fully justifiable as the components contained in the paint agent are degradable in the natural circuit. In accordance with the invention, a surprisingly simple way in the development of a known selective solvent is a generally applicable leaching agent of extremely low toxicity, and in the use of which no other measures than those generally recognized as necessary are to be taken. using flammable liquids. The agent is distinguished by a substantially as high solubility at room temperature over most paint and varnish types as the known "hot stripper".
En foretrukken sammensætning fremgår af krav 2.A preferred composition is set forth in claim 2.
Fremgangsmåden ifølge opfindelsen er ejendommelig ved det i krav 4's kendetegnende del angivne. En afledt effekt 10 af den anvendte fremgangsmåde til fremstillingen af aflake-ringsmidlet er, at aflakeringsmidlet på enkel måde under brugen kan stimuleres, så det bibeholder sin effekt, idet de komponenter, som skal tilsættes ved stimuleringen blot skal tilsættes og blandes ved omrøring.The process according to the invention is characterized by the characterizing part of claim 4. A derived effect 10 of the method used to prepare the lacquer agent is that the lacquer agent can be simply stimulated during use to maintain its effect, the components to be added to the stimulation simply being added and mixed by stirring.
15 Aflakeringsmiddel ifølge opfindelsen kan især finde anvendelse til aflakering af let korroderbare metaller ved koldstripning. Fortrinsvis foretages koldstripningen ved en oversprøjtning fremfor ved en neddypning. Ved oversprøjtningen nedsænkes emnerne i en aerosoltåge, hvorved der sammen-20 lignet med neddypningen opnås både kortere aflakeringstider og et mindre kemikalieforbrug.In particular, the stripping agent according to the invention can be used for the laceration of easily corroded metals by cold stripping. Preferably, the cold stripping is performed by a spray rather than by a dip. During the spraying, the blanks are immersed in an aerosol mist, which, in comparison with the immersion, results in both shorter leaching times and less chemical consumption.
Opfindelsen skal i det følgende beskrives nærmere ved hjælp af nogle eksempler og det vedlagte diagram.The invention will now be described in more detail with the aid of some examples and the accompanying diagram.
Et aflakeringsmidlet ifølge opfindelsen fremstilles 25 ved tilsætning af kaliumhydroxyd til en eventuelt til kogning opvarmet ethylalkohol under omrøring, hvorefter der tilsættes methyl-pyrrolidon i et kvantum tilnærmelsesvis svarende til opløsningens.A stripping agent according to the invention is prepared by adding potassium hydroxide to an optionally heated ethyl alcohol with stirring, after which methyl pyrrolidone is added in a quantity approximately equal to that of the solution.
I et sådant produkt vil kaliumhydroxyden kun i ringe 30 grad være dissocieret, og aflakeringsmidlet vil derfor ikke være reaktivt over for korroderbare metaller såsom aluminium. Produktet vil derfor kunne anvendes til aflakering af emner af aluminium ved koldstripning, dvs. ved nedsænkning af emnerne i produktet ved rumtemperatur, indtil lakeringen 35 er opløst, hvorefter emnerne tages op og afskylles i vand. Selvom produktet således er fuldstændig blandbart med vand, bør det ikke udsættes for nogen form for opblanding med vand under brugen, idet en sådan opblanding selv i små mængder DK 169079 B1 5 dels vil øge dissociationsgraden og dermed korrosionsrisikoen over for aluminium, og dels vil øge ætsefaren overfor huden på de personer, som bruger aflakeringsmidlet.In such a product, the potassium hydroxide will only be dissociated to a small degree and the stripping agent will therefore not be reactive to corrosible metals such as aluminum. Therefore, the product can be used for coating aluminum items by cold stripping, ie. by immersing the blanks in the product at room temperature until the coating 35 is dissolved, after which the blanks are taken up and rinsed in water. Thus, although the product is completely miscible with water, it should not be subjected to any admixture with water during use, as such mixing even in small amounts will increase the degree of dissociation and thus the risk of corrosion against aluminum and partly increase the etching danger to the skin of the people using the paint.
Der er udført forsøg til eftervisning af N-methylpyrro-5 lidonens virkning i en opløsning af kaliumhydroxyd i ethanol. Forsøgene er udført med polyesterbelagte prøveplader af aluminium, som blev neddyppet i forskellige væskekombinationer ved stuetemperatur.Experiments have been carried out to demonstrate the effect of the N-methylpyrrolidone in a solution of potassium hydroxide in ethanol. The experiments were carried out with polyester coated aluminum test plates which were immersed in various liquid combinations at room temperature.
Der blev fremstillet følgende aflakeringsmidler med 10 følgende sammensætninger udfra ethanol (99,6%)(EtOH), kaliumhydroxyd (analysevare) (KOH) og N-methyl-pyrrolidon (teknisk kvalitet) (NMP):The following strippers were prepared with the following compositions from ethanol (99.6%) (EtOH), potassium hydroxide (analytical product) (KOH) and N-methyl-pyrrolidone (technical grade) (NMP):
Forsøgsserie I:Experiment Series I:
15 I II III IV V VI VII VIII15 I II III IV V VI VII VIII
EtOH vægt% 90 80 60 50 40 30 20 10 NMP vægt% 8 18 38 48 58 68 78 88 KOH vægt% 22222222 20 Forsøgsserie II:EtOH wt% 90 80 60 50 40 30 20 10 NMP wt% 8 18 38 48 58 68 78 88 KOH wt% 22222222 20 Experiment Series II:
I II III IV V VII II III IV V VI
EtOH vægt% 84,21 73,68 63,16 52,63 42,11 31,58 NMP vægt% 10,53 21,05 31,58 42,11 52,63 63,16 25 KOH vægt% 5,26 5,26 5,26 5,26 5,26 5,26 I forsøgsserie I er I og II sammenligningsmidler, og III - VIII midler ifølge opfindelsen. I forsøgsserie II er I - III sammenligningsmidler, og IV - VI midler ifølge opfin-30 delsen.EtOH weight% 84.21 73.68 63.16 52.63 42.11 31.58 NMP weight% 10.53 21.05 31.58 42.11 52.63 63.16 25 KOH weight% 5.26 5 , 26 5.26 5.26 5.26 5.26 In Experimental Series I, I and II are comparative agents and III - VIII agents of the invention. In test series II, I - III are comparative agents and IV - VI are inventive agents.
Aflakeringsmidlerne ifølge forsøgsserie I blev afprøvet ved en række forsøg med polyesterbelagte prøveplader af aluminium, som blev neddyppet ved stuetemperatur i midlerne. Prøvepladerne var af legering 2S(AA1200) fra Hydro alu-35 minium og kromatiseret i henhold til RAL std GSB 612 - gul-kromatisering. De blev forsynet med en polyesterlak INTER-POND D86 (TGIC-hærder) fra International Farvefabrik A/S med en lagtykkelse på 100-120 my og hærdet ved 200°C i 10 min.The strippers of Experimental Series I were tested in a series of experiments with aluminum polyester coated test plates which were immersed at room temperature in the agents. The test plates were of alloy 2S (AA1200) from Hydro aluminum and chromatographed according to RAL std GSB 612 - yellow chromatization. They were provided with a polyester lacquer INTER-POND D86 (TGIC hardener) from International Farvefabrik A / S with a layer thickness of 100-120 microns and cured at 200 ° C for 10 minutes.
6 DK 169079 B1 Væskesammensætning nr. I og II i forsøgsserie I viste ingen synlig nedbrydning af polyesterbelægningen efter 1 times eksponering. Efter 4 timers eksponering viste prøverne svage tegn på dekomponering (sprødhed), men ingen aflake-5 ringseffekt fra substratet, og efter 13 timer var belægningen stadig fastsiddende på substratet, men kunne fjernes ved kraftig mekanisk påvirkning.6 DK 169079 B1 Liquid Composition Nos. I and II of Experimental Series I showed no visible degradation of the polyester coating after 1 hour of exposure. After 4 hours of exposure, the samples showed weak signs of decomposition (brittleness) but no leaching effect from the substrate, and after 13 hours the coating was still stuck to the substrate but could be removed by strong mechanical action.
Sammensætning nr. Ill - VIII: Alle belægninger viste umiddelbare opløsningstendenser efter kort tids neddypning 10 (3 min.). Efter 30 min. var belægningerne, som var neddyppet i sammensætning nr. IV - VII, opløst, og resterende belægninger kunne fjernes ved afskylning med vand. Efter 1 time var alle belægninger neddyppet i sammensætning nr. III -VIII totalt opløst.Composition No. Ill - VIII: All coatings showed immediate dissolution trends after a short immersion 10 (3 min). After 30 min. For example, the coatings immersed in composition Nos. IV - VII were dissolved and residual coatings could be removed by rinsing with water. After 1 hour, all coatings immersed in composition # III-VIII were completely dissolved.
15 Tilsvarende aflakeringsafprøvninger blev udført med væskesammensætningerne ifølge forsøgsserie II. På tilsvarende måde som ved forsøgsserie I blev polyesterlakerede prøveplader af ekstruderet aluminium, der var grønkromateret iht. DIN 50 939, neddyppet i midlerne ved stuetemperatur.Similar de-coating tests were performed with the liquid compositions of Experimental Series II. In a similar manner to Test Series I, polyester lacquered extruded aluminum sheets, green-chromated to DIN 50 939, were immersed in the agents at room temperature.
20 Lakeringen var udført med INTERPOND 600, der er en af International Farvefabrik A/S leveret polyesterlak, der hærdes med TGIC.20 The coating was done with INTERPOND 600, which is a polyester varnish supplied by International Farvefabrik A / S, which is cured with TGIC.
Forsøgene viste med væskesammensætning I og II ingen synlig nedbrydning efter 30 minutters eksponering. Sammen-25 sætningerne III - VI var alle efter 30 minutters neddypning i stand til at udføre en fuldstænding aflakering, og med sammensætning VI opnåedes aflakeringen på mindre end 2 minutter.The experiments with liquid compositions I and II showed no visible degradation after 30 minutes of exposure. Compositions III - VI were, after 30 minutes immersion, able to perform a complete lacquering, and with composition VI the lacquer was achieved in less than 2 minutes.
Forsøgsrækkerne viser, at forholdsvis lave indhold af 30 N-methyl-pyrrolidon på ca. 20 vægt% eller mindre ikke påvirker opløsningsevnen af et alkali opløst i en alkohol, men at der ved større indhold på ca. 35 vægt% eller mere, sker en overraskende kraftig forbedring af blandingens aflakeringsevne. Forsøgsrækkerne viser endvidere, at selv om indholdet 35 af alkali forøges, opnås der ikke en afgørende forbedring af aflakeringseffekten sammenlignet med den forbedring, som opnås ved høje indhold af N-methyl-pyrrolidon. Forsøgsrækkerne, der er udført med typiske og meget anvendte polyester- DK 169079 B1 7 lakker, viser, at aflakeringsevnen for midlet ifølge opfindelsen er på højde med kendte varmstripperes aflakeringsevne.The test series show that relatively low content of 30 N-methyl-pyrrolidone of approx. 20% by weight or less does not affect the solubility of an alkali dissolved in an alcohol, but that at a higher content of approx. 35% by weight or more, there is a surprisingly sharp improvement in the blending ability of the mixture. The test series further show that although the content of alkali is increased, a significant improvement in the paint effect is not achieved compared to the improvement achieved by high content of N-methyl-pyrrolidone. The test rows, which are made with typical and widely used polyester paint, show that the stripping ability of the agent according to the invention is equal to the stripping ability of known hot strippers.
Til belysning af virkningen af aflakeringsmidlets 5 indhold af N-methyl-pyrrolidon ved koncentrationer i området mellem ca. 18 og 40 vægt% er der udført yderligere forsøg, der underbygger iagttagelsen af den forholdsvis skarpe grænse for kombinationsvirkningen af N-metyl-pyrrolidon og KOH opløst i en alkohol med 2-3 karbonatomer. Resultatet af 10 forsøgsrækken er vist på det vedlagte diagram. Diagrammet viser lagtykkelsen af et laklag af en TGIC-hærdet polyesterlak på grønkromateret aluminium efter aflakering i forskellige tidsrum på maximalt 240 minutter. Ved forsøget anvendtes samme koncentration af KOH, nemlig 2,2 vægt%, medens 15 forholdet mellem ethylalkohol og N-methyl-pyrrolidon blev varieret. I diagrammet er indholdet af N-methyl-pyrrolidon (NMP) angivet, idet indholdet af ethanol (EtOH) udgør resten op til 100 vægt%.To illustrate the effect of N-methyl-pyrrolidone content of the stripping agent 5 at concentrations in the range of approx. 18 and 40 wt%, further experiments have been carried out which support the observation of the relatively sharp limit of the combination action of N-methyl-pyrrolidone and KOH dissolved in an alcohol of 2-3 carbon atoms. The results of the 10 test series are shown on the attached diagram. The diagram shows the layer thickness of a lacquer layer of a TGIC-cured polyester lacquer on green chromated aluminum after varnishing for various periods of maximum 240 minutes. In the experiment, the same concentration of KOH, namely 2.2% by weight, was used, while the ratio of ethyl alcohol to N-methyl-pyrrolidone was varied. The diagram shows the content of N-methyl-pyrrolidone (NMP), with the content of ethanol (EtOH) making up the residue up to 100% by weight.
Det ses af diagrammet, at der med indhold af NMP un-20 der 18 vægt% ikke opnås nogen egentlig aflakering, og at en hurtig virkning med en tydelig effekt efter 10 minutters ophold i badet fordrer et indhold på mindst 33 vægt% NMP, og det fremgår således, at der med aflakeringsmidlet iflg. opfindelsen opnås en bedre effekt sammenlignet med midlet, der 25 er beskrevet i USA-patentskrift nr. 3.551.204.It can be seen from the diagram that with an NMP content below 18% by weight no actual paint is obtained and that a rapid effect with a clear effect after 10 minutes of bathing requires a content of at least 33% by weight NMP, and it thus appears that with the stripping agent according to. the invention achieves a better effect compared to the agent disclosed in U.S. Patent No. 3,551,204.
Forsøgsrækken er udført med en almindelig anvendt polyesterlak, men der er konstateret en god effekt af aflake-ringsmidlet ifølge opfindelsen over for følgende laktyper: 30 Celluloselakker (nitrocellulose, acetylcellulose mv.)The test series is made with a commonly used polyester varnish, but a good effect of the de-leaching agent according to the invention has been found against the following lactic types: 30 Cellulose varnishes (nitrocellulose, acetylcellulose, etc.)
Klorkautsjuk Polyvinylklorid (PVC)Polyvinyl chloride (PVC)
Polyvinylacetat (PVA)Polyvinyl acetate (PVA)
Polyakrylnitril 35 PolyacrylatPolyacrylonitrile Polyacrylate
Polystyrenpolystyrene
Forsøg har dog også vist, at der findes visse lakty- DK 169079 B1 8 per, som aflakeringsmidlet ifølge opfindelsen ikke er effektivt overfor, og blandt disse kan nævnes: Nylon (RILSAN), vinyl (LEVASINT), visse typer af elektroforeselakker og visse epoxylakker.However, tests have also shown that there are certain lactic substances which the stripping agent according to the invention is not effective against, and among these can be mentioned: Nylon (RILSAN), vinyl (LEVASINT), certain types of electrophoresis and certain epoxy varnishes .
5 Forsøg har ligeledes vist, at aflakeringsmidlet bli ver mindre aktivt over for lak og maling ved et vandindhold, som overstiger ca. 2,5 %, og samtidig udviser midlet en stigende tilbøjelighed til at korrodere letmetaller. Under af-lakeringsprocessen forbruges OH-ioner, og der vil ligeledes 10 ske en vis fordampning af den forholdsvis flygtige alkohol. Gennem en brugsperiode for et bad med aflakeringsmidlet bør der derfor ske en perodisk stimulering gennem tilsætning af en kaliumhydroxydholdig alkohol.5 Experiments have also shown that the paint agent becomes much less active against lacquers and paints at a water content exceeding approx. 2.5%, and at the same time, the agent exhibits an increasing tendency to corrode light metals. During the stripping process, OH ions are consumed and some evaporation of the relatively volatile alcohol will also occur. Therefore, during a period of use of a bath with the stripping agent, periodic stimulation should be effected through the addition of a potassium hydroxide-containing alcohol.
Efter en længere brugsperiode vil der i et bad være 15 ophobet betydelige mængder af nedbrudt lak. Badets indhold af N-methyl-pyrrolidon er imidlertid i det væsentlige ufor-brugt. Det er derfor muligt i stedet for at kassere badet at lade det regenere. Regenereringen består hovedsagelig i en filtrering, men kan tillige bestå i en egentlig separering 20 af de indgående kemikalier, f.eks. ved en vakuumdestillation. En vigtig forudsætning for en sådan regenering er den enkle sammensætning af aflakeringsmidlet og den anvendte fremstillingsmåde, der forebygger en nedbrydning af N-methyl-pyrrolidonen.After a prolonged period of use, a considerable amount of degraded varnish will accumulate in a bath. However, the content of the N-methyl-pyrrolidone bath is essentially unused. It is therefore possible, instead of discarding the bath, to let it regenerate. The regeneration mainly consists of a filtration, but can also consist of an actual separation of the incoming chemicals, e.g. by a vacuum distillation. An important prerequisite for such regeneration is the simple composition of the stripping agent and the method of preparation used which prevents the degradation of the N-methyl-pyrrolidone.
25 Formuleringen af aflakeringsmidlet bevirker, at mid let udviser et lavt flammepunkt og derved fordrer stor forsigtighed under anvendelsen på grund af brandfare. Det er muligt at hæve midlets flammepunkt ved tilsætning af en gly-kol, især butyldiglykol. Butyldiglykol foretrækkes på grund 30 af dets kommercielle tilgængelighed til moderate priser og de beskedne beskyttelsesforantaltninger, som er nødvendige ved dets brug. Med en tilsætning af butyldiglykol vil det være muligt at hæve flammepunktet for aflakeringsmidlet til mindst 21°C. Glykolen har ingen påviselig virkning på afla-35 keringsmidlets effekt, men optræder som et fyldstof i komponentblandingen. Kun i tilfælde af at aflakeringsmidlet cirkuleres ved hjælp af en pumpe, ses en vis smørende virkning på pumpens bevægelige dele. Glykolfraktionen vil til en vis DK 169079 B1 9 grad ved en regenering indgå sammen med de opløste forsæbningsrester fra den aflakerede lak og derved blive frasepareret og destrueret sammen med forsæbningsresterne.The formulation of the stripping agent causes the agent to exhibit a low flash point and thus requires great caution during use due to fire hazard. It is possible to raise the flash point of the agent by the addition of a glycol, especially butyldiglycol. Butyldiglycol is preferred because of its commercial availability at moderate prices and the modest safeguards necessary for its use. With the addition of butyldiglycol, it will be possible to raise the flash point of the staining agent to at least 21 ° C. The glycol has no detectable effect on the effect of the scouring agent, but acts as a filler in the component mixture. Only in the case of the stripping agent being circulated by means of a pump is some lubricating effect seen on the moving parts of the pump. To a certain extent, the glycol fraction will, by regeneration, form together with the dissolved saponification residues from the varnished varnish, thereby being separated and destroyed together with the saponification residues.
Det er muligt helt eller delvis at erstatte ethanolen 5 med n-propanol og i-propanol.It is possible to completely or partially replace the ethanol 5 with n-propanol and i-propanol.
Det er tillige muligt at tilsætte fortykkelsesmidler til dannelse af en pasta, hvorved aflakeringsmidlet tillige vil kunne anvendes, uden at de genstande, der skal aflakeres, neddyppes i et bad af midlet.It is also possible to add thickeners to form a paste, whereby the stripping agent can also be used without immersing the objects to be stripped in a bath of the agent.
1010
Claims (6)
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DK185491A DK169079B1 (en) | 1991-11-12 | 1991-11-12 | Essentially anhydrous agent for the laceration of blanks of easily corroded materials containing N-methyl-pyrrolidone, potassium hydroxide and an alcohol of 2-3 carbon atoms, and process for its preparation and use thereof. |
| PCT/DK1992/000331 WO1993010196A1 (en) | 1991-11-12 | 1992-11-11 | Composition for stripping enameled or painted surfaces and method for its manufacture |
| EP92923717A EP0705310A1 (en) | 1991-11-12 | 1992-11-11 | Composition for stripping enameled or painted surfaces and method for its manufacture |
| AU29426/92A AU2942692A (en) | 1991-11-12 | 1992-11-11 | Composition for stripping enameled or painted surfaces and method for its manufacture |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DK185491 | 1991-11-12 | ||
| DK185491A DK169079B1 (en) | 1991-11-12 | 1991-11-12 | Essentially anhydrous agent for the laceration of blanks of easily corroded materials containing N-methyl-pyrrolidone, potassium hydroxide and an alcohol of 2-3 carbon atoms, and process for its preparation and use thereof. |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| DK185491D0 DK185491D0 (en) | 1991-11-12 |
| DK185491A DK185491A (en) | 1993-05-13 |
| DK169079B1 true DK169079B1 (en) | 1994-08-08 |
Family
ID=8108552
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DK185491A DK169079B1 (en) | 1991-11-12 | 1991-11-12 | Essentially anhydrous agent for the laceration of blanks of easily corroded materials containing N-methyl-pyrrolidone, potassium hydroxide and an alcohol of 2-3 carbon atoms, and process for its preparation and use thereof. |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0705310A1 (en) |
| AU (1) | AU2942692A (en) |
| DK (1) | DK169079B1 (en) |
| WO (1) | WO1993010196A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2768152B1 (en) * | 1997-09-11 | 2001-07-06 | Appryl Snc | COMPOSITION FOR THE STRIPPING OF POLYMER PAINTS |
| GB2344826A (en) * | 1998-12-16 | 2000-06-21 | Ibm | Plastic surface cleaning |
| DE10112720A1 (en) * | 2001-03-14 | 2002-10-02 | Kaercher Gmbh & Co Alfred | Basic, non-aqueous decontamination liquid |
| CN102433043B (en) * | 2011-09-13 | 2013-06-12 | 天津德高化成电子材料有限公司 | Epoxy resin and silicon resin cured coating and package removing agent and preparation method thereof |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3551204A (en) * | 1967-08-08 | 1970-12-29 | Amicon Corp | Process and composition for recovering electronic devices from encapsulation in potting compounds |
| US3954648A (en) * | 1969-12-22 | 1976-05-04 | Pennwalt Corporation | Coatings removal composition containing an alkali metal hydroxide, an oxygenated organic solvent, and an amine |
| US4276186A (en) * | 1979-06-26 | 1981-06-30 | International Business Machines Corporation | Cleaning composition and use thereof |
| US5091103A (en) * | 1990-05-01 | 1992-02-25 | Alicia Dean | Photoresist stripper |
-
1991
- 1991-11-12 DK DK185491A patent/DK169079B1/en active
-
1992
- 1992-11-11 EP EP92923717A patent/EP0705310A1/en not_active Withdrawn
- 1992-11-11 WO PCT/DK1992/000331 patent/WO1993010196A1/en not_active Application Discontinuation
- 1992-11-11 AU AU29426/92A patent/AU2942692A/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| DK185491A (en) | 1993-05-13 |
| WO1993010196A1 (en) | 1993-05-27 |
| AU2942692A (en) | 1993-06-15 |
| DK185491D0 (en) | 1991-11-12 |
| EP0705310A1 (en) | 1996-04-10 |
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