DE548967C - Cleaning agent for precious metals - Google Patents

Cleaning agent for precious metals

Info

Publication number
DE548967C
DE548967C DE1930548967D DE548967DD DE548967C DE 548967 C DE548967 C DE 548967C DE 1930548967 D DE1930548967 D DE 1930548967D DE 548967D D DE548967D D DE 548967DD DE 548967 C DE548967 C DE 548967C
Authority
DE
Germany
Prior art keywords
precious metals
cleaning agent
metals
precious
thiourea
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
DE1930548967D
Other languages
German (de)
Inventor
Dr Heinrich Gockel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
IG Farbenindustrie AG
Original Assignee
IG Farbenindustrie AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by IG Farbenindustrie AG filed Critical IG Farbenindustrie AG
Application granted granted Critical
Publication of DE548967C publication Critical patent/DE548967C/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • C11D7/34—Organic compounds containing sulfur

Description

Putzmittel für Edelmetalle Die reinigende Wirkung der gebräuchlichen Putzmittel für Edelmetalle, wie Gold und Silber, besteht im allgemeinen darin, daß die Oberfläche der Edelmetalle durch Reiben mit fein verteilten festen Stoffen in Pulver-, Pasten- oder ähnlicher Form von Oxydationsprodukten und anderen Verunreinigungen befreit wird. Es ist dabei unvermeidlich, daß die Oberfläche der Metalle mehr oder weniger stark angegriffen wird. Bei dünnen Edelmetallauflagen auf unedleren Metallen erleiden diese Edelmetallauflagen eine schnelle Abnutzung.Cleaning agents for precious metals The cleaning effect of the common ones Cleaning agents for precious metals, such as gold and silver, generally consist in that the surface of the precious metals by rubbing with finely divided solids in Powder, paste or similar form of oxidation products and other impurities is released. It is inevitable that the surface of the metals more or is less strongly attacked. With thin precious metal layers on less precious metals These precious metal pads suffer from rapid wear and tear.

Es wurde nun gefunden, daB man Edelrnetalle sehr schonend reinigen kann, wenn man sie mit einer dünnen, wäßrigen, säurefreien Lösung von Thioharnstoff oder dessen wäBrigen Derivaten, z. B. Methylthioharnstoff, behandelt. Die Verwendung von Thioharnstoff in Reinigungsmitteln für unedle Metalle ist bekannt. Beispiel Gegenstände aus Edelmetall, wie Gold, Silber u. a., oder Gegenstände mit Auflagen aus solchen Metallen, die unansehnlich geworden sind, werden mit einer iprozentigen wäßrigen, säurefreien Lösung von Thioharnstoff abgerieben und erhalten danach wieder hohen metallischen Glanz. Behandeln in der Wärme beschleunigt den Reinigungsprozeß.It has now been found that precious metals can be cleaned very gently can if you treat them with a thin, aqueous, acid-free solution of thiourea or its aqueous derivatives, e.g. B. methylthiourea treated. The usage of thiourea in detergents for base metals is known. example Objects made of precious metal, such as gold, silver, etc., or objects with cushions metals that have become unsightly are turned into with an i percent Aqueous, acid-free solution of thiourea rubbed off and then obtained again high metallic luster. Treating in heat speeds up the cleaning process.

Claims (1)

PATENTANSPRUCH: Säurefreie Putzmittel für Edelmetalle, gekennzeichnet durch einen Gehalt an Thioharnstoff oder seinen Derivaten. PATENT CLAIM: Acid- free cleaning agent for precious metals, characterized by a content of thiourea or its derivatives.
DE1930548967D 1930-05-01 1930-05-01 Cleaning agent for precious metals Expired DE548967C (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE548967T 1930-05-01

Publications (1)

Publication Number Publication Date
DE548967C true DE548967C (en) 1932-04-21

Family

ID=6562130

Family Applications (1)

Application Number Title Priority Date Filing Date
DE1930548967D Expired DE548967C (en) 1930-05-01 1930-05-01 Cleaning agent for precious metals

Country Status (1)

Country Link
DE (1) DE548967C (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE968189C (en) * 1941-10-21 1958-01-23 Josefine Jorde Geb Jorde Cleaning and polishing agents and cleaning baths for precious metals
US2845756A (en) * 1956-02-24 1958-08-05 Voigtlaender Ag Profile projector or comparator for cutting machine tools
DE1190293B (en) * 1958-04-28 1965-04-01 Hans Becker Cleaning, cleaning and polishing agents as well as cleaning baths for precious metal surfaces

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE968189C (en) * 1941-10-21 1958-01-23 Josefine Jorde Geb Jorde Cleaning and polishing agents and cleaning baths for precious metals
US2845756A (en) * 1956-02-24 1958-08-05 Voigtlaender Ag Profile projector or comparator for cutting machine tools
DE1190293B (en) * 1958-04-28 1965-04-01 Hans Becker Cleaning, cleaning and polishing agents as well as cleaning baths for precious metal surfaces

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