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Treatment method for surface discoloration of sterling silver products

A technology of surface discoloration and treatment method, which is applied in the field of surface discoloration treatment of pure silver products, can solve the problems of complex types of agents and high cost, and achieve the effects of high cost performance, low cost and reduced silver loss

Active Publication Date: 2021-11-05
上海志行合力网络技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Disadvantages of this method: the types of medicaments are too complicated and the cost is high; it is necessary to expose the fresh surface of the magnesium surface and closely adhere to the surface of silver handicrafts, which is difficult to do in actual operation, especially for irregularly shaped utensils. harder to reach
Most of the chemical agents used in the above patents contain more or less solid particles, which will inevitably cause physical damage such as scratches on the surface of pure silver handicrafts during the treatment process.

Method used

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  • Treatment method for surface discoloration of sterling silver products
  • Treatment method for surface discoloration of sterling silver products
  • Treatment method for surface discoloration of sterling silver products

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Raw material composition:

[0032] Cleaning agent (parts by weight): 10 parts of concentrated ammonia water, 3 parts of sodium cyanide, 20 parts of glucose, 12 parts of inorganic alkali and 20 parts of polyol.

[0033] Protective agent:

[0034] The protective agent is prepared by the following method:

[0035] S1. Preparation of intermediates: Weigh 1.1 mol p-tert-butylphenol, 1.2 mol α-bromoacetic acid, 1 mol ammonium thiocyanate, and 1.5 mol aminoacyl chloride in a certain proportion and add them to a three-necked bottle filled with 200 mL 95% ethanol , and then add 5mL acetic acid; when heating, when a brown precipitate appears, the solution turns red, and the solvent is refluxed for 20min, and the mixture is poured into a beaker placed in an ice bath, at this time, a yellow-brown solid is precipitated, and filtered under reduced pressure to obtain as an intermediate;

[0036] S2. Preparation of protective agent: Dissolve 1 mol of the intermediate in absolute e...

Embodiment 2

[0049] Raw material composition:

[0050] Cleaning agent (parts by weight): 20 parts of concentrated ammonia water, 5 parts of sodium cyanide, 30 parts of glucose, 17 parts of inorganic alkali and 50 parts of polyol.

[0051] Protective agent:

[0052] The protective agent is prepared by the following method:

[0053] S1. Preparation of intermediates: Weigh 1.1 mol p-tert-butylphenol, 1.2 mol α-bromoacetic acid, 1 mol ammonium thiocyanate, and 1.5 mol aminoacyl chloride in a certain proportion and add them to a three-necked bottle filled with 200 mL 95% ethanol , and then add 5mL acetic acid; when heating, when a brown precipitate appears, the solution turns red, add solvent and reflux for 20-50min, pour the mixture into a beaker placed in an ice bath, at this time, a yellow-brown solid precipitates, filter under reduced pressure , obtained as an intermediate;

[0054] S2. Preparation of protective agent: Dissolve 1 mol of the intermediate in absolute ethanol, then add 10...

Embodiment 3

[0060] Raw material composition:

[0061] Cleaning agent (parts by weight): 12 parts of concentrated ammonia water, 4 parts of sodium cyanide, 22 parts of glucose, 14 parts of inorganic alkali and 25 parts of polyhydric alcohol.

[0062] Protective agent:

[0063] The protective agent is prepared by the following method:

[0064] S1. Preparation of intermediates: Weigh 1.1 mol p-tert-butylphenol, 1.2 mol α-bromoacetic acid, 1 mol ammonium thiocyanate, and 1.5 mol aminoacyl chloride in a certain proportion and add them to a three-necked bottle filled with 200 mL 95% ethanol , and then add 5mL acetic acid; when heating, when a brown precipitate appears, the solution turns red, add solvent and reflux for 20-50min, pour the mixture into a beaker placed in an ice bath, at this time, a yellow-brown solid precipitates, filter under reduced pressure , obtained as an intermediate;

[0065] S2. Preparation of protective agent: Dissolve 1 mol of the intermediate in absolute ethanol,...

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Abstract

The invention proposes a treatment method for the discoloration of the surface of pure silver products. The pure silver products with discolored surfaces are soaked in a solution prepared with a cleaning agent. After 1-2 hours, the silverware is taken out, cleaned, dried, and soaked in a protective agent. After 30‑50 minutes in the prepared solution, take out the silverware, wash it, and blow it dry. The cleaning agent is prepared from the following raw materials in parts by weight: 10-20 parts of concentrated ammonia water, 3-5 parts of sodium cyanide, 20-30 parts of glucose, 12-17 parts of inorganic alkali and 20-50 parts of polyol; The protective agent has the following structure: the process of the present invention is simple, and the processing time is very short; the normal temperature operation does not cause physical damage to the surface, and the loss of silver is almost zero; the cleaning agent and the protective agent can be stored at room temperature, ready to use, Repeated use, subsequent cleaning is simple, thorough, and low-cost, which is cost-effective compared with other methods.

Description

technical field [0001] The invention relates to the technical field of processing pure silver products, in particular to a treatment method for surface discoloration of pure silver products. Background technique [0002] With the improvement of people's living standards and the rise of collection fever, silverware has become increasingly popular. However, silver wares exposed to the air for a long time, such as silver coins (chapters), silver ornaments, etc., are prone to black or yellow spots on the surface, gradually covering the entire surface of the silver wares, affecting the aesthetics and appreciation of the utensils, and greatly reducing their appearance. Collection value. [0003] The main component of black or yellow spots on the surface of silverware is silver sulfide, and it also contains a small amount of silver chloride, silver oxide and other components. The methods commonly used to remove dark spots or yellow spots on the surface of silverware include physi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23G1/20C07C333/10C23G1/18
CPCC07C333/10C23G1/18C23G1/20
Inventor 张双立
Owner 上海志行合力网络技术有限公司
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