DD203477A1 - CLEANING METHOD FOR GRINDED AND POLISHED GLASS AND METAL PRODUCTS - Google Patents

Abstract

The invention relates to a cleaning method for ground and polished glass and metal products for the removal of grinding and Polierrueckstaenden on glass, especially lead crystal and metal products. The purification process consists of an ultrasound treatment of 1 to 900 seconds in the presence of a 0.01 to 5% aqueous solution of alkanolamines and ethylene oxide adducts, which are present in a mass ratio of 1: 0.1 to 1:10. The process is used in gas and metal processing.

Description

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Title of the invention

Cleaning process for ground and polished glass and metal products

Field of application of the invention

The invention relates to an Eeinigungsverfahren for ground and polished glass and metal products for the removal of grinding and polishing residues, in particular of lead crystal and Metalleraeugnissen. The removal is carried out by application of ultrasound with the simultaneous action of alkylolamines and Athy1enoxidaddukten. Bas process is used in glass and metal processing.

Characteristic of the known technical solutions

During the processing of glass, residues in the form of finely divided abrasives and glass dust remain on the glass after grinding and polishing processes. For subsequent processes, these residues must be removed. In particular, this relates to the removal of Bückständen on Kristallglasgefäiben, z. As lead crystal articles, which are then etched. In the currently technically common .. procedure, the removal of the residues is carried out by manual processing, ie with brushes using detergent, which requires a lot of time, especially if the cleaning due to the operational process only a long time after completion of the sole ifvorganges is performed , The cleaning process is often incomplete.

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It is also known that the sonication of illumination glass is performed with ultrasound in water. However, the detergents based on anionic surfactants used in this case lead to very large foaming, which results in a strong absorption of air by the water; this leads to a reduction of the sound energy transmission and thus to a considerable reduction of the eeinigungseffektes.

Furthermore, anionic surfactants form insoluble Brdalkali- and Schwermet allsalze, the. then deposit as a gray haze on the glasses to be cleaned and hinder the subsequent etching process. The formed gray haze requires an additional cleaning process ·

It is also known that ultrasonic dishwashing machines are used for cleaning polished and polished glass and metal products. "The disadvantage of these machines is that the sound energy due to large air spaces is too low, since complete coverage of the items to be cleaned is not guaranteed."

When grinding and foiling metals, metal and abrasive residues remain on the metal. Their adhesion is reinforced by oils and greases, grinding and polishing emulsions. The currently customary cleaning process with anionic surfactants and with (DB-OS 2 β29 829) and without ultrasound is unsatisfactory. Foaming and the deposition of insoluble brdalkali and heavy metal salts reduce the cleaning effect. Furthermore, von Hachteil, that the aqueous solutions of Äniontensiaen while applying mechanical forces on metal parts promote corrosion, whereby an additional corrosion protection 'is required.

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When cleaning. Glass objects under these conditions by reaction of the anionic surfactants with heavy metal and alkaline earth metal ions on the glass surface the. Strength of the glass reduced.

Object of the invention

The object of the invention is a cleaning method for ground and polished glass and metal products for removing grinding and polishing residues, which completely cleans in a short time without the action of mechanical energy and protects metals and glass from corrosion and destruction.

Explanation of the essence of the invention

The invention has for its object to find an effective cleaning method for removing grinding and polishing residues.

According to the invention, the objects to be cleaned are subjected to an ultrasound treatment of 1 to 900 seconds in the presence of a 0.01- to 5% aqueous solution of one or more alkylolamines and one or more ethylene oxide adducts which have a Ma ratio of 1: 0.1 to 1: 10 are included, suspended,

It was surprisingly found that the use ύοώ. Solutions consisting of alkylalamines and ethylene oxide adducts, when used ultrasonically, lead to complete cleaning of the ground and polished glass or metal products, avoiding the occurrence of gray-scale smearing on glass products or corrosion of metal products and destruction of the glass surface.

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The alkylolamine used may be the known compounds mono-, di- and / or diethanolamine and the corresponding compounds of isopropanolamine In the removal of abrasives and polishing agents from metals, the use of 3-Di- and / or triethanolamine is advantageous because of the enhanced anticorrosion effect As ethylene oxide adducts the use of the following products is possible:

Alkylpolyglykoläther, Alkylphenolpolyglykoläther, Äcylpolyglykoläther and the Ädditionsverbindungen of ethylene oxide to alkylamines. Ethylene oxide adducts of alkyl alcohols of the chain length C. Q - C. o and 8 to 15 molecules of ethylene oxide are particularly advantageous in the sense of the invention. The products alkylolamine and Ethyleneoxidaddukt can be added as a concentrate together or individually in the water and distributed homogeneously.

For complete foam suppression further foam suppressants, such as silicone products, can be added.

Ultrasound baths or ultrasonic troughs are suitable as ultrasound apparatus. The apparatus must be sufficiently filled with the aqueous solution so that the objects to be cleaned are completely covered. The bath liquid can be moved for better removal of the dirt by stirrers or by pumping.

The use of the cleaning combination of alkylolamine / ethylene oxide adduct / ultrasound ensures that the transmission of the sound energy to the surface to be cleaned by the liquid medium and is not weakened by air or other gas cushion.

The application of ultrasound is advantageously carried out in the frequency range 10 - 50 kHz. It is also advantageous, but not necessary, to use sound generation with piezoelectric sounders.

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The sounders can be arranged stationary or as leek vibrator. The duration of the ultrasound treatment depends on the degree of soiling and on the age of the, pollution. If the treatment is carried out immediately after grinding and / or polishing, a sonication of 1 to a maximum of 300 seconds is sufficient. For longer stored dirty G-las or metal objects, a treatment up to 900 seconds is appropriate. Sine Shortening of the duration of treatment is possible by soaking in the cleaning solution for 1 to 5 minutes.

embodiments Example 1:

For the cleaning of G-las and metal parts the following ultrasonic equipment is used:

Octagonal container tray with a capacity of 50 liters, equipped with 4 ultrasonic transmitters mounted in pairs on the bottom and on the front sides of the vessel

are. , , ·.

The technical Daxen of the sounders are:

Sound frequency: 32 IcHz

input

of the generators: 1.5 kW

Example 2:

In the apparatus according to Example 1, 30 l of an aqueous solution of the following composition are charged:

99} 9 f ° water

? 0.03 ° ^{diethanolamine;} 0.04 io Ethylene oxide adduct (8 molecules AO

', -ι _ : Ί v ^ vi .-. ι Ί w ^ Q -.Tj.a.sjj.lv> j. j

, 0.01 p silicone-based antifoam 0.02 - / o ethyl alcohol

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The temperature of the "solution" is 30 G. The lead crystal glass objects to be cleaned are placed in such a way that complete coverage with solution is ensured and there are no air bubbles in the vessel The vessels were clean for 60 seconds (visual examination).

Example 3:

In Example 1 and 2, previously deposited lead crystal glassware was treated 2 x 60 seconds. The loosely adhering dirt was then rinsed off with water.

Example 4:

Ground pressboard articles were treated after 5 days of storage according to Examples 1 and 2. Thereafter, on the objects was still a gray haze made of glass flour, which completely dissolved in the subsequent etching and thus does not represent a disturbing pollution.

Example 5'-

In a laboratory ultrasound apparatus (cylinder 1 1 content, sound generator on the ground, 20 kHz), 800 ml of the following composition were introduced:

97 l of water 1 l of triethanolamine

Λ, 5% ethylene oxide adduct (15 molecules of AO an

C ₁₀ -C ₁₂ alcohol)

0.1 fo silicone based defoamer 0.4 1 = ethyl alcohol

A clay-polished metal object (Mu 8 steel) was sonicated for 20 seconds. After drying, it was stored in air for 4 weeks. Bine corrosion was not observed.

Claims (4)

1. Cleaning process for ground and polished glass and metal products
characterized by,. that the objects to be cleaned are subjected to an ultrasonic treatment of 1 to 900 seconds in an aqueous solution of alkylolamines and Äthylenoxidaddukten. 2. Method according to point 1.,. characterized in that as alkylolamine di- and / or triethanolamine and as Äthylenoxidaddukt a Alkylpolyglykoläther from 3 etoikoholen the chain length C _1Q - C .. "^ ¹ " ³ · ⁸ ^ ^{is used} 15 molecules of ethylene oxide in a mass ratio of 1: 1. 3. The method according to item 1 and 2, characterized in that the ultrasound treatment in a 0.01 - 5 ^ i aqueous solution of alkylolamines and Äthylenoxidaddukten, which are contained in the mass ratio of 1: 0.1 to 1:, takes place. 4. The method according to item 1 to 3, characterized in that ultrasound is applied with a frequency between 10 and 50 kHz ·