JPH04214884A - Cleaner for noble metal and precious ornament - Google Patents

Abstract

PURPOSE:To provide a safe cleaner for noble metals and precious ornaments capable of being easily and safely used in homes, excellent in cleaning effect and capable of easily removing the stains of the precious ornaments and noble metal products in hand, especially the blackened stains of silverware. CONSTITUTION:The granular, powdery or tableted solid cleaner contg. carbonates, org. acids, reducing matter, surfactant and protease is gradually added to the stained noble metal and precious ornament dipped in water, and then the ornament is taken out and washed.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning agent for precious metals and jewelry that removes rust and dirt accumulated in fine gaps of precious metals and jewelry and restores the shine of the main body of the jewelry.

0002

[Prior Art] Conventionally, methods for removing dirt from precious metals and jewelry and restoring their original shine include a jewelry washer (Japanese Utility Model Publication No. 158592/1982) and an ultrasonic cleaning device (Japanese Utility Model Publication No. 1994/99483). A physical cleaning method using a cleaning agent (Japanese Patent Application Laid-Open No. 49-119462, Japanese Patent Application Laid-open No. 62-26539)
Publication No. 9).

0003

[Problems to be Solved by the Invention] However, physical cleaning methods using a jewelry washer or an ultrasonic cleaning device require the preparation of relatively expensive equipment and equipment, and it is not possible to easily clean the jewelry you already have at home. There was a problem that they could not be cleaned properly and had to rely on specialty shops.

On the other hand, in the chemical cleaning method using a cleaning agent, it is necessary to apply the cleaning agent to a brush, sponge, etc., and it is difficult to thoroughly polish the details. In addition, methods using liquid cleaning agents consisting of strong acids or alkaline substances and surfactants can remove dark stains from silver products in a short time, but there is a risk of damaging the precious metal body if immersed for a long time, making it unsafe. There was also a problem with.

[0005]Therefore, there has been a need for a technique that can be carried out at home and that can reliably clean dirt from precious metals and jewelry, especially gold and silver products, in a simple and safe manner.

[0006]

Means for Solving the Problems The present invention aims to solve the above problems, and is characterized in that it contains a carbonate, an organic acid, and a reducing substance, and is in a solid form. Furthermore, in addition to the above structure, it is characterized in that it is in the form of granules containing a proteolytic enzyme and a surfactant, and that the carbonate and the organic acid are not contained in the same granule.

Precious metals and jewelry to which the cleaning agent of the present invention can be used include precious metal products such as gold, silver, platinum, and rhodium, and jewelry in which various types of jewelry are set in the above-mentioned precious metals. Furthermore, copper, which belongs to the same group as gold and silver on the periodic table, can also be cleaned, and copper, nickel, and
It is also possible to clean alloys with zinc or the like, such as white gold or sterling silver.

[0008] Carbonates used in the present invention include sodium carbonate, sodium hydrogen carbonate, potassium carbonate, potassium hydrogen carbonate, and the like. It is necessary to violently generate carbon dioxide gas in the presence of an organic acid and water, and it can be used as is if it has a purity level that is commercially available for industrial use. The blending ratio of carbonate is preferably 20 to 40 parts by weight based on 100 parts by weight of the total solid content of the cleaning agent. If the amount is less than 20 parts by weight, there will be little generation of bubbles, and if it is added in an amount exceeding 40 parts by weight, the detergency will hardly increase.

[0009] Examples of organic acids include gluconic acid, tartaric acid, citric acid, DL-malic acid, malic acid, oxalic acid, sorbic acid, and ascorbic acid. If so, you can use it. The blending ratio of the organic acid is 80 to 20 parts by weight, preferably 60 to 30 parts by weight, based on 100 parts by weight of the total solid content of the cleaning agent. If it is less than 20 parts by weight, the cleaning power will be poor, and if it is added in excess of 80 parts by weight, the cleaning effect will hardly change.

[0010] The reducing substance may be any substance that has the function of reducing the oxide film on the surface of the noble metal, such as thiourea, ammonium thioglycolate, sodium thioglycolate, sodium thiosulfate, ammonium thiosulfate, and sodium pyrosulfite. , organic or inorganic sulfur compounds such as potassium pyrosulfite, or sodium dehydroacetate.

[0011] The blending ratio of the reducing substance is the total solid content of the cleaning agent 1
00 parts by weight, preferably 20 to 60 parts by weight, preferably 20 to 60 parts by weight
It is 40 parts by weight. If it is less than 20 parts by weight, the reducing power will be poor;
Even if more than 60 parts by weight is added, the reducing effect hardly changes. Surfactants are added in small amounts to remove organic stains attached to precious metals and jewelry, and there are no particular restrictions on the type of surfactant. agent is used. The amount of surfactant added is 0.01 to 10.00%, preferably 0.1% of the total weight of carbonate, organic acid, and reducing substance.
It is added in a range of 2.0%.

[0012] Proteolytic enzyme is a commonly commercially available substance called protease, and is used in combination with the above-mentioned surfactant, and is used in combination with 0.001 of the total weight of carbonate, organic acid, and reducing substance. ~1.000%, preferably 0
．． It is added in a range of 0.005 to 0.500%.

Furthermore, the cleaning agent for precious metals and jewelry of the present invention may contain a binder, a lubricant, an abrasive, a pH adjuster, a thickener, a disinfectant, a preservative, etc. .

[0014] The detergent of the present invention may be in a solid form such as a powder, granule, or tablet, but it is more preferable that the carbonate and organic acid be separated by some means. Separation methods include granulating the carbonate and organic acid separately and then mixing them, or forming a tablet into at least two layers and separating the carbonate and organic acid in each layer and compressing the tablet. There is a method in which either a salt or an organic acid is microencapsulated and blended. Other compounded chemicals may be compounded with either the carbonate or the organic acid, or may be dispersed and compounded in both.

[0015] When cleaning precious metals and jewelry, the amount of cleaning agent to be added per unit amount of water varies depending on the type of precious metal, the degree of dirt, the temperature during cleaning, the precision of the workmanship, etc., but in general, the amount of cleaning agent added per unit amount of water is , Cleaning agents 3 to 30 of the present invention
It is about g.

In actual implementation, the precious metal or jewelry to be cleaned is placed in a container made of plastic, aluminum, or heat-resistant glass, and a predetermined amount of cold water, hot water, or hot water is poured into the container, and then the present invention is carried out. A certain amount of a powder, granule, or tablet-type cleaning agent may be added, left for 5 to 15 minutes, and the object to be cleaned may be taken out, thoroughly washed with water, and dried.

[0017]

[Action] The precious metal and jewelry cleaning agent of the present invention, which is composed of carbonate, organic acid, and reducing substance, is solid during distribution and storage, and when it is poured into water, it reacts with water and violently generates carbon dioxide gas. do. The microvibrations caused by the generation of carbon dioxide gas cause components with a cleaning action to penetrate into the fine details of the jewelry, allowing the cleaning effect to be exerted even inside complex-shaped depressions.

[0018]

【Example】

Example 1 600 g of sodium bicarbonate, 800 g of DL-malic acid, and 600 g of thiourea (all of the above reagents are made by Nacalai Tesque and are grade 1 reagents) were mixed in a small V-type blender for 5 minutes.
The mixture was mixed for a minute to form a powdered cleaning agent. Silver rings and silver necklaces that had turned black and lost their shine to be cleaned were placed in a 200 cc beaker, 100 cc of hot water at 70 to 80°C was added, and 10 g of the above-mentioned cleaning agent powder was added and dissolved. A large number of fine bubbles were generated. After 5 minutes, the ring and necklace were taken out and thoroughly washed with water. The blackened dirt was completely removed, the dullness was removed, and the original shine was restored.

Example 2 500 g of the cleaning agent for precious metals and jewelry prepared in Example 1
After adding 5 g of sodium stearate as a lubricant, it was made into tablets with an outer diameter of 10 mm and a thickness of 10 m using a 12-bar tablet press.
m tablets were prepared. The compression strength of this tablet is 6Kg/c
It was m2. 18 with diamonds as the object to be cleaned
100c gold ring and 18k gold ring with sapphire
Pour 50cc of room temperature water into the beaker of c, and add the above tablet 3.
When the tablet was added, it immediately dissolved with vigorous generation of fine bubbles. After 8 minutes, I took out the ring, washed it well with water, and dried it, which removed the dullness and restored the ring's original shine.

Example 3 A sterling silver spoon and knife were placed in a vat with a capacity of 1 liter, and 200 cc of hot water at 70 to 80°C was poured into the vat, followed by dissolving 20 g of the jewelry cleaning agent prepared in Example 1. After 5 minutes, the blackened surface stains and overall dullness were removed, and the original shine of the silverware was restored.

Example 4 Sodium hydrogen carbonate as carbonate (food additive manufactured by Asahi Glass Co., Ltd.)
4 kg, 1 g of sodium lauryl sulfate (special grade product manufactured by Nacalai Tesque Co., Ltd.) as a surfactant, 1 g of protease (special grade product manufactured by Kyowa Hakko Co., Ltd.) as a proteolytic enzyme, and hydroxypropyl cellulose low polymerization type (hereinafter referred to as H) as a binder.
PC-L) and 240 g of water were placed in a kneader and mixed to form a wet mass. This wet mass was extruded from a granulator with a diameter of 1.5 mm, crushed, and then dried using a ventilated shelf dryer.
Granules A were obtained by drying at ℃ for 1 hour. Separately, 6 kg of DL-malic acid (food additive manufactured by Fuso Chemical Co., Ltd.) as an organic acid, 30 g of HPC-L as a binder, and 240 g of water were placed in a kneader and mixed to form a wet mass. This wet mass was extruded from a granulator with a diameter of 1.5 mm, crushed, and dried at 40° C. for 1 hour using a ventilated shelf dryer to obtain granules B.

Equal amounts of the granules A and B were mixed to prepare a detergent for precious metals and jewelry. Two 14-karat gold rings and one 18-karat gold necklace to be cleaned were placed in a 200 cc beaker, 100 cc of 40°C warm water was added, and 10 g of the above-mentioned cleaning agent was added little by little. It occurred violently. After 15 minutes, the rings and necklaces were taken out and thoroughly washed with water, which removed surface dirt and overall dullness, and restored the original shine.

Example 5 Sodium hydrogen carbonate as carbonate (food additive manufactured by Asahi Glass Co., Ltd.)
9 kg, 6 kg of thiourea (special grade product manufactured by Yamamoto Kagaku Co., Ltd.) as a reducing substance, 3 g of sodium lauryl sulfate (special grade product manufactured by Nacalai Tesque Co., Ltd.) as a surfactant, and protease (special grade product manufactured by Kyowa Hakko Co., Ltd.) as a proteolytic enzyme. product) 3g
75 g of HPC-L as a binder and 900 g of water were placed in a kneader and mixed to form a wet mass. This wet mass is 1.5m in diameter.
After extrusion molding and crushing using the granulator M, the granules were dried at 50° C. for 1 hour using a ventilated shelf dryer to obtain granules A.

Separately, as organic acids, 12 kg of DL-malic acid (food additive manufactured by Fuso Chemical Co., Ltd.), 3 kg of thiourea, HPC
-L 75g and water 600g were placed in a kneader and mixed to form a wet mass. This wet mass was extruded from a granulator with a diameter of 1.5 mm, crushed, and dried at 40° C. for 1 hour using a ventilated shelf dryer to obtain granules B. These granules A and B were mixed in equal amounts to prepare a cleaning agent for precious metals and jewelry.

Two pure silver medals partially blackened with silver sulfide in a 200cc beaker (weights 20.4g and 22.5g)
), and after adding 100 cc of 60°C warm water, 10 g of the above-mentioned cleaning agent was gradually added, and fine bubbles were violently generated. When the medal was taken out after 15 minutes and washed with water, the blackened stain caused by silver sulfide had been completely removed.

[0027]

[Effects of the Invention] The cleaning agent for precious metals and jewelry of the present invention, especially the cleaning agent that separates carbonates and organic acids, is stable in quality and can be used easily and safely at home. Moreover, it provides an excellent cleaning effect and allows you to easily clean the blackened stains on your jewelry and precious metal products, especially silver products.

Claims (5)

[Claims] 1. A cleaning agent for precious metals and jewelry, which contains a carbonate and an organic acid and is in solid form. 2. A cleaning agent for precious metals and jewelry, which contains a carbonate, an organic acid, and a reducing substance, and is in solid form. 3. The cleaning agent for precious metals and jewelry according to claim 1 or 2, which contains a surfactant and a protease. 4. A cleaning agent for precious metals and jewelry according to any one of claims 1 to 3, comprising a mixture of two or more types of granules containing different compounded chemicals, wherein one of the granules contains A cleaning agent for precious metals and jewelry that contains carbonate and the other granule contains organic acid. 5. The precious metal and jewelry according to claim 3 or 4, wherein the carbonate is sodium hydrogen carbonate, the organic acid is DL-malic acid, and the reducing substance is thiourea. Washing soap.