RU2558357C1 - Preparation for surface cleaning of products, manufactured from copper and its alloys - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention relates to household chemistry and can be used in household, in vaults of museums, in antique shops, numismatics: coins (ancient and modern), products of cultural and community and cultural and historical purpose, as well as in automobile industry and electrical engineering for cleaning wires, terminals, etc., in alcohol production and beer brewing for cleaning external surface of pipelines, made of copper and its alloys, in armed forces for cleaning firearms barrels to remove soot, residues of copper and its alloys (bronze), remaining from bullets after shooting, from the surface of barrel channels. Described is preparation for cleaning surfaces, which contains: 1.0-2.5% of disodium salt of ethylenediaminetetraacetic acid ("Trilon B); 5.0-10.0% of aminoacetic acid (glycine); 0.1-0.2% of Sintanol DS-10; 5.0-10.0% of caustic potash; 2.5-5.0% of tris(hydroxymethyl)aminomethane ("Tris"); 3.0-10.0% of ethyleneglycol, distilled water (to 100%).

EFFECT: creation of preparation, which cleans surface of objects, made from copper and its allows, effectively.

4 ex

Description

The invention relates to household chemicals and is intended for cleaning surfaces of objects made of copper and its alloys.

The invention can be used in everyday life, in the vaults of museums, in antique stores, numismatics: coins (old and modern), cultural and historical products. The invention can be used in the automotive industry and electrical engineering for cleaning wires, terminals, etc., in alcohol and brewing for cleaning the outer surface of pipelines made of copper and its alloys, in the armed forces for cleaning firearms with the aim of removing the surface of the channels of the soot barrels, the remains of copper and its alloys (bronze) remaining from bullets after firing.

As a result of storage or operation of products made of copper and its alloys, the surface of these products is usually covered with corrosion products of different colors: green, blue, whitish, etc., depending on the impurities in copper. This leads to the fact that the products lose their appearance and attractiveness, or the performance of the product deteriorates. There is a need for cleaning (restoration) of the surface of products, which is especially important in application, for example, to old coins.

Currently, the most widely used methods of liquid (chemical) cleaning of metal surfaces. They have obvious advantages over methods such as mechanical exposure, ultrasonic treatment, electrolytic or plasma chemical etching, etc. due to its efficiency, versatility, small metal losses and, in some cases, due to improved surface properties of the processed products.

There are many ways of chemical cleaning of surfaces of objects made of copper and its alloys. These methods can be used if the necessary composition is at hand or components for its preparation are commercially available. In practice, users usually use the following cleaning products:

1. Aqueous solutions of acids: acetic, citric, oxalic;

2. Aqueous or aqueous-alcoholic solutions of ammonia;

3. Digestion in vegetable or petroleum jelly oils;

4. The use of household chemicals: "Fairy", "AOS", "Mr. Muscle" and others;

5. Use a warm soapy solution or jelly made from laundry soap.

All of these methods have, apparently, only one advantage, which is the availability of ingredients. The disadvantages of these methods are most often associated with their excessive aggressiveness. With careless handling of these agents, not only the layer of corrosion products, but also the metal itself can dissolve.

Known paste for cleaning metal surfaces from corrosion products [USSR patent No. 985149 (1982)] containing phosphoric acid, ethyl alcohol, water glass, butyl cellosolve, methylene chloride, kaolin, water. However, this paste, firstly, is ineffective for cleaning surfaces of non-ferrous and noble metals, secondly, it contains toxic components: butyl cellosolve, methylene chloride, and thirdly, it contains kaolin - an abrasive. The use of any abrasive, no matter how fine grinding it is, can spoil the surface of the product, especially if there is a fine pattern on it. The inconvenience also causes the complexity of the method of preparation of the paste.

Abrasive components are also included in a number of other means for cleaning metal surfaces from corrosion products and residues of varnishes and adhesives [USSR patent No. 1636434 (1991), RF patent No. 2199581 (2003), RF patent No. 2410416 (2009)]. In addition, these products contain toxic and unsafe organic solvents and acids. These products are ineffective for cleaning surfaces of non-ferrous and noble metals, after their use a thorough washing of the product with water is required.

Known tool for cleaning the surfaces of copper, silver and gold coins ("Industrial Strength Coin Brightner MS 70", manufacturer "Betterbilt Chemical", USA) from corrosion products - taken by us as a prototype. The composition of this agent includes butyl cellosolve, potassium hydroxide, sodium gluconate, a mixture of disodium salts of hexyl diphenyl ether disulfonate and dihexyl diphenyl ether disulfonate, water. This tool is quite effective. It is often used by numismatists to restore the surface of ancient coins made of non-ferrous and precious metals. However, along with efficiency, users also note some aggressiveness of this tool: along with dissolving corrosion products, it can also dissolve the metal itself when not handled properly. In addition, the presence of butyl cellosolve and disodium salts of hexyl diphenyl ether disulfonate and dihexyl diphenyl ether disulfonate in the composition makes one doubt the safety of the agent. Butyl cellosolve is an organic, high boiling but flammable solvent. In light of contact with air, explosive peroxide compounds can form. When ingested through the skin or mouth, it can cause headache, dizziness, nausea, and vomiting [http://www.chemicalbook.com/]. The above derivatives of diphenyl ether, which play the role of surfactants in the composition of the agent, when ingested through the skin, mouth or by inhalation, can cause irreversible negative changes in the body [http: //www.chemicalbook.eom/RiskAndSafety.htm#hazards ].

The present invention aims to create a new effective and safe for the health of the consumer means for cleaning the surfaces of objects made of copper and its alloys. The specified technical result is achieved by the fact that for surface cleaning use a tool that includes:

- 1.0-2.5% disodium salt of ethylenediaminetetraacetic acid ("Trilon B");

- 5.0-10.0% aminoacetic acid (glycine);

- 0.1-0.2% Sintanol DS-10;

- 5.0-10.0% potassium hydroxide;

- 2.5-5.0% Tris (hydroxymethyl) aminomethane ("Tris");

- 3.0-10.0% ethylene glycol;

- distilled water (up to 100%).

The preparation of this agent is illustrated by the following examples.

Example 1. In a glass, flat-bottomed, single-necked flask with a capacity of 150 ml, 50 ml of distilled water was poured, 6.0 g of potassium hydroxide was dissolved in it with shaking. 2.5 g of Trilon B, 10.0 g of glycine, 2.5 g of tris (hydroxymethyl) aminomethane, 0.2 g of Syntanol DS-10, 3.0 g of ethylene glycol were successively added to the warm solution. Each ingredient was added after dissolving the previous one. After the formation of the solution, it was filtered through a folded paper filter. Distilled water was added to the filtrate to 100 g. The resulting solution was used for cleaning.

Example 2. In a glass, flat-bottomed, single-necked flask with a capacity of 150 ml, 50 ml of distilled water was poured, 5.0 g of potassium hydroxide was dissolved in it with shaking. 2.0 g of Trilon B, 5.0 g of glycine, 5.0 g of tris (hydroxymethyl) aminomethane, 0.12 g of Syntanol DS-10, 10.0 g of ethylene glycol were successively added to the warm solution. Each ingredient was added after dissolving the previous one. After the formation of the solution, it was filtered through a folded paper filter. Distilled water was added to the filtrate to 100 g. The resulting solution was used for cleaning.

Obtained in examples 1 and 2 funds are colorless, non-foaming liquids, odorless. They are stable during prolonged storage at room temperature.

All the ingredients of the compositions obtained in examples 1 and 2, effectively complement each other, enhancing the cleaning properties. They are nontoxic or low toxic compounds (hazard class> 3).

Disodium salt of ethylenediaminetetraacetic acid (Trilon B) - complexon, a white crystalline powder, sparingly soluble in water, widely used in industry for washing heat power equipment, water treatment in boiler houses and heating systems, in the pulp and paper industry, in analytical chemistry and many other fields . LD ₅₀ = 2 g / kg [http://esis.irc.ec.europa.eu].

Aminoacetic acid (glycine) is a complexon, the acidity regulator is a white crystalline powder, highly soluble in water. Non-toxic, used as a drug to improve cerebral circulation, an essential amino acid.

Tris (hydroxymethyl) aminomethane ("Tris") - complexon, medium acidity regulator - white crystalline powder, highly soluble in water. "Tris" is widely used in biochemistry and molecular biology as a buffer to reduce the acidity of the medium [G, Gomori, Methods Enzymology., 1, 138-146 (1955)]. According to its chemical structure, Tris is a primary amine and has properties characteristic of amines. Tris is practically non-toxic. It is used in medicine as an alternative to sodium bicarbonate in the treatment of metabolic acidosis [R.H. Kallet, R.M. Jasmer, J.M. Luce et al., Am. J. Resp.and Critical Care Medicine, V. 161, N 4, 1149-1153 (2000)], is part of the non-steroidal anti-inflammatory drug with analgesic and antipyretic effect "Dexalgin 25" [Instructions for medical use of the drug "Dexalgin 25"] .

Syntanol DS-10 - a surfactant - a colorless paste, readily soluble in water, is a mixture of hydroxyethylated higher alcohols. It serves for degreasing a metal surface. Synthols are part of detergents, they are used as suspension stabilizers, emulsifiers, antistatic agents in the processing of synthetic fibers, degreasers of wool and metal surfaces, leveling agents for dyeing with vat dyes, wetting agents, additives in detergent compositions, dispersants. Low toxicity (hazard class 4).

Ethylene glycol - helps to reduce the evaporation of the cleaning agent from the metal surface - a high-boiling organic solvent that mixes well with water. Ethylene glycol is widely used in many industries, in synthetic organic chemistry. Moderately toxic (hazard class 3) [GOST 10164-75].

Caustic potassium - a regulator of the acidity of the medium, helps exfoliate and dissolve corrosion products - white granules, well soluble in water.

All the ingredients of the composition obtained in example 1 are quite cheap.

The compositions obtained in examples 1 and 2 effectively clean the surfaces of objects made of copper and its alloys. When cleaning, for example, the surfaces of old coins, the resulting composition removes only corrosion products without affecting the patina, unlike the Industrial Strength Coin Brightner MS 70.

Examples of use of cleaning products

All work with a cleaning agent must be carried out in rubber gloves, glasses. Avoid contact with clothing, skin, mouth, eyes.

Example 3 (low degree of surface contamination with corrosion products). Dampen a cotton swab in a cleaner. Use a swab to wipe the surface of the item until you reach the desired result. Rinse the subject's surface with running water and dry it by wetting with filter paper. You can use a dry and soft cloth. If the final result does not satisfy, repeat the indicated operations.

Example 4 (severe degree of surface contamination by corrosion products). Use a cotton swab to clean the item. Wait 2-3 minutes, lightly wiping especially contaminated areas. Gather the remnants of the product with a cotton swab and rinse the surface of the item well with running water, then dry it by wetting with filter paper. You can use a dry and soft cloth. If the final result does not satisfy, repeat the indicated operations.

Claims (1)

Means for cleaning the surfaces of objects made of copper, silver and their alloys, which is a solution of low toxic, cheap components, in the following ratio of components:
- 1.0-2.5% disodium salt of ethylenediaminetetraacetic acid ("Trilon B");
- 5.0-10.0% aminoacetic acid (glycine);
- 0.1-0.2% Sintanol DS-10;
- 5.0-10.0% potassium hydroxide;
- 2.5-5.0% Tris (hydroxymethyl) aminomethane ("Tris");
- 3.0-10.0% ethylene glycol;
- distilled water (up to 100%).