Silver discoloring preventive intermediate, composition and discoloring preventive silver and preparation method

A technology of silver discoloration and intermediates, which is applied in the field of anti-discoloration silver and its preparation, composition, and intermediates for preventing silver discoloration. Effects of corrosion and energy reduction

A technology of silver discoloration and intermediates, which is applied in the field of anti-discoloration silver and its preparation, composition, and intermediates for preventing silver discoloration. Effects of corrosion and energy reduction

CN109338340AActive Publication Date: 2019-02-15CHENZHOU CITY JINGUI SILVER IND CO LTD
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  • Silver discoloring preventive intermediate, composition and discoloring preventive silver and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) Add 121.36g tetraethyl orthosilicate, 486g dehydrated ethanol and 1214g deionized water in order, after mixing uniformly, stir at room temperature for 60 minutes to carry out hydrolysis to obtain an organic solution of tetraethyl orthosilicate;

[0042] (2) 17.76g of boric acid was added to the organic solution of ethyl orthosilicate, and stirred at room temperature for 20 minutes to obtain a transparent solution A;

[0043] (3) Slowly add 775g of bismuth nitrate solution with a mass concentration of 10% in solution A, stir and mix for 120 minutes at room temperature to obtain a transparent intermediate;

[0044] (4) Take out after immersing the silver piece in the intermediate for 30 seconds, place the silver piece in a ventilated place for 24 hours, and form an intermediate layer on the surface of the silver piece;

[0045] (5) Carrying out heat treatment to the intermediate layer, said heat treatment includes heating the temperature from room temperature to 200°C...

Embodiment 2

[0047] (1) Add 121.5g tetraethyl orthosilicate, 486g absolute ethanol and 1215g deionized water in sequence, after uniform mixing, stir at room temperature for 50 minutes for hydrolysis to obtain an organic tetraethyl orthosilicate solution;

[0048] (2) 26.6g of boric acid was added to the organic solution of ethyl orthosilicate, and stirred at room temperature for 15 minutes to obtain a transparent solution A;

[0049] (3) Slowly add 775g of bismuth nitrate solution with a mass concentration of 10% in solution A, stir and mix for 100 minutes at room temperature to obtain a transparent intermediate;

[0050] (4) Take out after soaking the silver piece in the intermediate for 20 seconds, put the silver piece in a ventilated place for 22 hours, and form an intermediate layer on the surface of the silver piece;

[0051] (5) Carrying out heat treatment to the intermediate layer, the heat treatment includes heating the temperature from room temperature to 180°C at a rate of 1°C / mi...

Embodiment 3

[0053] (1) Add 121.36g tetraethyl orthosilicate, 486g dehydrated ethanol and 1214g deionized water in order, after uniform mixing, stir at room temperature for 70 minutes for hydrolysis to obtain an organic solution of tetraethyl orthosilicate;

[0054] (2) 17.76g of boric acid was added to the organic solution of ethyl orthosilicate, and stirred at room temperature for 25 minutes to obtain a transparent solution A;

[0055] (3) Slowly add 852 g of bismuth nitrate solution with a mass concentration of 10% in solution A, stir and mix for 140 minutes at room temperature to obtain a transparent intermediate;

[0056] (4) Take out after soaking the silver piece in the intermediate for 40 seconds, place the silver piece in a ventilated place for 26 hours, and the intermediate layer is formed on the surface of the silver piece;

[0057] (5) Carrying out heat treatment to the intermediate layer, the heat treatment includes heating the temperature from room temperature to 220°C at a r...

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Abstract

The invention discloses a silver discoloring preventive intermediate, a composition and discoloring preventive silver and a preparation method. The intermediate is a mixed solution comprising tetraethoxysilane, boric acid, bismuth nitrate and an organic solvent, wherein the weight ratio of tetraethoxysilane to boric acid to bismuth nitrate is 10-13: 1.5-3: 7-10. The composition is a glass body andcomprises silicon dioxide, diboron trioxide and bismuth trioxide based on the weight ratio of 30-35: 10-15: 50-55. The discoloring preventive silver is synthesized by the following steps: (1) mixingboric acid and tetraethoxysilane organic solutions to obtain a solution A; (2) mixing the solution A and bismuth nitrate to obtain the silver discoloring preventive intermediate; (3) soaking silver inthe silver discoloring preventive intermediate; moving out; and forming an intermediate layer on the surface of silver; and (4) thermally processing the intermediate layer; heating; and then decreasing the temperature to obtain the discoloring preventive silver. With the adoption of the silver discoloring preventive intermediate, the color remaining time of the discoloring preventive silver can be prolonged, and meanwhile, the corrosion resisting effect of the discoloring preventive silver can be improved.

Description

technical field [0001] The invention relates to an inorganic thin film and a preparation method, in particular to an intermediate for preventing silver discoloration, a composition, anti-discoloration silver and a preparation method. Background technique [0002] Silver is a precious metal material with a long history of use. The use of silver first started from making jewelry, and it is widely used in the manufacture of currency, tableware, handicrafts and decorations. When silver and its alloys are used in the atmospheric environment, due to the polluting gases contained in the atmosphere, such as hydrogen sulfide, sulfur dioxide, nitrogen dioxide, hydrogen chloride and ozone, etc., an electrolyte will be formed on the surface of the silver to cause atmospheric corrosion, making the silver A dark adhesive film is produced on the surface, which is manifested by the discoloration of silver, which affects the appearance and use of silver jewelry. [0003] Currently common an...

Claims

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Application Information

Patent Timeline
15 Feb 2019
Publication
CN109338340A
IPC
C23C18/12
CPC
C23C18/1212; C23C18/1241
Inventors
黄前军; 代林涛