SE196019C1 - - Google Patents

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Publication number
SE196019C1
SE196019C1 SE196019DA SE196019C1 SE 196019 C1 SE196019 C1 SE 196019C1 SE 196019D A SE196019D A SE 196019DA SE 196019 C1 SE196019 C1 SE 196019C1
Authority
SE
Sweden
Prior art keywords
acid
plaster according
abrasive
thiourea
aqueous solution
Prior art date
Application number
Other languages
Swedish (sv)
Publication date
Publication of SE196019C1 publication Critical patent/SE196019C1/sv

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Description

Uppfinnare: A ML Lindner och A B Groth FUreliggande uppfinning avser ett puts- eller polermedel for metaller, exempelvis silver och koppar. Putsmedlet enligt uppfinningen innehaller: -80 %vattenlosning av glycerin upp till 20 % av sadana lagre karbonsyror som ha formaga att biIda komplexfore- ningar med jarngruppens metaller 1-10 %tiourinamne . upp till 75 % slipmedel. Inventors: A ML Lindner and A B Groth The present invention relates to a polishing or polishing agent for metals, for example silver and copper. The polishing agent according to the invention contains: -80% aqueous solution of glycerin up to 20% of such lower carbonic acids which are capable of forming complex compounds with the metals of the iron group 1-10% of thiourea. up to 75% abrasive.

Den goda verkan som uppnas med putsmedlet enligt uppfinningen far tillskrivas den samtidiga narvaron av komplexbildande karbonsyra, donrinamne, glycerin och slipmedel. Tiourinamnets verkan dr kemiskt ej heft klarlagd. I sum a lbsningar besitter det en utomordentligt kraftigt losande verkan pa vissa metallsulfider, speciellt sulfider av silver och koppar, genom ati bilda komplexa metallforeningar. Dess reducerande verkan kan majligen aven vara av betydelse. The good effect obtained with the polishing agent according to the invention can be attributed to the simultaneous presence of complex-forming carbonic acid, donrin name, glycerin and abrasive. The effect of the tiourine name is not chemically clear. In some solutions, it has an extremely potent release effect on certain metal sulphides, especially sulphides of silver and copper, by forming complex metal compounds. Its reducing effect may also be important.

Tiourinamne dr kant som bestandsdel i metallputsmedel. Man har darvid i allmanhet anvant tiourinamnet som inhibitor for att forebygga angrepp pa metallytan. Mangden tiourinamne har darvid vanligen varit 0,01-0,1 viktsprocent, saledes betydligt mindre du vad som foreskrives enligt foreliggande uppfinning. Ett putsmedel med en tiourinamneshalt av ungefar samma storlek som enligt uppfinningen dr kant fran den svenska patentskriften 167 770. En sa hog halt av tiourinamne, i kombination med det surgoringsmedel som foreskrives i patentskriften i fraga, namligen svavelsyra, medfor en allvarlig risk fOr ett icke onskat angrepp pa metallytor, speciellt ytor av rostfritt stal. Icke heller silverytor kunna helt tillfredsstdllande behandlas med ett dylikt putsmedel, enar de ha en tendens att bli matta. Tiourine name dr edge as an ingredient in metal polishes. The thiourea name has generally been used as an inhibitor to prevent attack on the metal surface. The amount of thiourea name has usually been 0.01-0.1% by weight, thus considerably less than what is prescribed according to the present invention. A polishing agent with a thiourea content of approximately the same size as according to the invention from the Swedish patent specification 167 770. Such a high content of thiourea, in combination with the acidifying agent prescribed in the patent in question, namely sulfuric acid, entails a serious risk of a non undesired attack on metal surfaces, especially stainless steel surfaces. Nor can silver surfaces be completely satisfactorily treated with such a polishing agent, since they have a tendency to become matt.

Namnda nackdelar undvikas med putsmedlet enligt uppfinningen, som tillater narvaron av en hog halt tiourinamne utan risk for angrepp pa rostfritt stal och med ett synnerligen gott resultat pa silverytor. Said disadvantages are avoided with the polishing agent according to the invention, which allows the presence of a high content of thiourea without risk of attack on stainless steel and with a particularly good result on silver surfaces.

Tack vare karbonsyrans komplexbildande formaga kan putsmedlet enligt uppfinningen losa upp och halla i losning de korrosionsprodukter av olika slag som ofta finnas pa- metallytor. Ddrigenom fOrhindras uppkomsten av svara flackbildningar och andra angrepp pa rostfritt material, t. ex. rostfria diskbankar. Valet, av syra begransas darav, att syran maste ha en viss bislighet i vatten, samt att dissociationskonstanten ej bor overstiga 10-1 for att man icke skall riskera etsverkan pa den metall som skall putsas. Lampliga karbonsyror aro oxalsyra och lagre oxikarbonsyror sasom vinsyra, appelsyra och citronsyra, sarnt blandningar av dessa. Thanks to the complex-forming shape of the carbonic acid, the polishing agent according to the invention can dissolve and keep in solution the corrosion products of various kinds which are often present in metal surfaces. This prevents the formation of black flakes and other attacks on stainless steel, e.g. stainless steel sinks. The choice of acid is limited by the fact that the acid must have a certain viscosity in water, and that the dissociation constant should not exceed 10-1 so that there is no risk of etching on the metal to be polished. Suitable carboxylic acids are oxalic acid and lower oxycarboxylic acids such as tartaric acid, malic acid and citric acid, and mixtures thereof.

Slipmedlet utovar en -rent idekanisk verkan pa det ytskikt som skall avlagsnas. Det far ej paverkas av i putsmedlet ingaende syror s att dess slipegenskaper forandras. Det är dessutom vasentligt att slipmedlet har en sadan hardhet och kernstorlek att det slipar utan att repa metallytan. Speciellt dr detta av vikt vid pntsning av forsilvrade ytor, dar slipmedlet maste vara sa >unilt> verkande att inga storre mangder metall komma att bortslipas. Vi foredraga att anvanda bariumsulfat som slipmedel. Kornstorleken bor ligga under 1 pm, och heist under 0,1 ium. Speciellt lampligt dr det att anvanda bariumsulfat som har fällts ur en vattenlosning av ett bariumsalt. The abrasive exerts a purely mechanical effect on the surface layer to be deposited. It must not be affected by acids contained in the polish so that its abrasive properties change. It is also essential that the abrasive has such a hardness and core size that it grinds without scratching the metal surface. This is especially important when painting silver-plated surfaces, where the abrasive must be so> unilateral> that no large amounts of metal will be sanded away. We prefer to use barium sulphate as an abrasive. The grain size should be below 1 μm, and raised below 0.1 μm. It is particularly convenient to use barium sulphate which has been precipitated from an aqueous solution of a barium salt.

Glycerinet ger putsmedlet en ldmplig konsistens, sa att det i form av en smidig pasta kan forpackas i tuber och sa att det kan fOrdelas i ett tunt skikt pA fOremalet som skall putsas. Glycerinvattenblandningens glycerinhalt bor ligga mellan 10 och 60 %. The glycerin gives the polishing agent an airtight consistency, so that in the form of a flexible paste it can be packed in tubes and so that it can be distributed in a thin layer on the grit to be polished. The glycerin content of the glycerin-water mixture should be between 10 and 60%.

Vid hoga halter av slipmedel, Over 20 %, verkar slipmedlet som fortjockningsmedel, sa att den Onskade pastakonsistensen erhalles. Glycerinhalten gOr, som redan namnts, att denna pasta blir smidig och latthanterlig. Vid en lagre halt av slipmedel, sarskilt vid halter under 10 %, kan man med fordel tillsatta ett speciellt fortj ockningsmedal, t. ex. metylcellulosa, for att erhalla en tillrackligt tjock konsistens pa kompositionen. At high levels of abrasive, Over 20%, the abrasive acts as a thickener, so that the desired paste consistency is obtained. The glycerin content, as already mentioned, makes this paste smooth and easy to handle. At a lower content of abrasive, especially at levels below 10%, it is advantageous to add a special thickening medal, e.g. methylcellulose, in order to obtain a sufficiently thick consistency of the composition.

En liten tillsats av ett vatningsmedel, exempelvis upp till 3 %, ger en god effekt i putsmedlet. Vatningsmedlet verkar emulgerande pa det fett som kan finnas pa metallytan, och bidrager dess- 2— — utom till att medlet efter putsningen ldtt kan bortskoljas med vatten. Som exempel pa vatningsmedel kan namnas anjonaktiva sulfonat, sulfater eller blandningar darav. Vissa icke jonaktiva vatningsmedel kunna aven med fordel anvandas. A small addition of a watering agent, for example up to 3%, gives a good effect in the polish. The wetting agent has an emulsifying effect on the grease which may be present on the metal surface, and contributes to this - except that the agent can be easily rinsed off with water after polishing. Examples of wetting agents are anionic sulfonates, sulphates or mixtures thereof. Some non-ionic irrigants can also be used to advantage.

Putsmedlet enligt uppfinningen kan om sa onskas innhalla aven andra ingredienser, exempelvis parfym, t. ex. metylsalicylat som är bestandigt i sur miljo. The polishing agent according to the invention may, if desired, also contain other ingredients, for example perfume, e.g. methyl salicylate which is stable in acidic environment.

Som ett exempel pa ett putsmedel med den foredragna pastakonsistensen skall namnas fOljande sammansattning: vatten14-20 %fOretradesvis 18 % glycerin vinsyra eller oxalsyra tiourinamne bariumsulfat, hilt vatningsmedel As an example of a polishing agent having the preferred paste consistency, the following composition should be mentioned: water 14-20% Preferably 18% glycerin tartaric or oxalic acid thiourea barium sulphate, whole watering agent

Claims (6)

Patentansprak:Patent claim: 1. Putsmedel for metaller, kannetecknat darav, att det innehaller 25-80 %vattenlosning av glycerin upp till 20 % av sadana lagre karbonsyror som ha formaga att bilda komplexfore- ningar med jarngruppens metaller 1-10 %tiourinamne upp till 75 % slipmedel.Polishing agents for metals, characterized in that they contain 25-80% aqueous solution of glycerin up to 20% of such lower carboxylic acids which are capable of forming complex compounds with ferrous metals 1-10% thiourea up to 75% abrasive. 2. Putsmedel enligt patentanspra'ket 1, kannetecknat darav, att karbonsyran är oxalsyra, vinsyra, app elsyra eller citroncyra, eller en blandning av dessa.Plaster according to claim 1, characterized in that the carbonic acid is oxalic acid, tartaric acid, malic acid or citric acid, or a mixture thereof. 3. Putsmedel enligt patentanspraket 1 eller 2, kannetecknat d'arav, att slipmedlet bestar av ur en vattenlosning utfallt bariumsulfat.Plaster according to claim 1 or 2, characterized in that the abrasive consists of barium sulphate precipitated from an aqueous solution. 4. Putsmedel enligt nagot av foreghende patentanspra' k, kannetecknat darav, att det bar pastaform och innehaller vatten14-20 % glycerin20-35 % vinsyra eller oxalsyra1-10 % tiourinamne1-10 % bariumsulfat, utfallt55 %4. Plaster according to any one of the preceding claims, characterized in that it was in paste form and contained water 14-20% glycerin20-35% tartaric acid or oxalic acid1-10% thiourea name10-10% barium sulphate, yield 55% 5. Putsmedel enligt nagot av foregaende patentansprak, kannetecknat darav, att det innehaller 0,05-3 % vatningsmedel.Plaster according to one of the preceding patent claims, characterized in that it contains 0.05-3% of watering agent. 6. Putsmedel enligt nagot av foregaende patentansprak, kannetecknat darav, att det for erhallande av pastakonsistens innehaller ett fOrtjockningsmedel, sasom metykellolosa. Anforda publikationer: Patentskrifter fran Sverige 149 853; Schweiz 294 627; Storbritannien 704 57 6.Plaster according to one of the preceding patent claims, characterized in that it contains a thickening agent, such as methylcellulose, in order to obtain a pasta consistency. Request publications: Patents from Sweden 149,853; Switzerland 294 627; United Kingdom 704 57 6.
SE196019D SE196019C1 (en)

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SE196019T

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SE196019C1 true SE196019C1 (en) 1964-01-01

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