A kind of silverware blackening agent and blackening method thereof

Abstract

The invention discloses a silverware blackening agent and a blackening method thereof. The silverware blackening agent is prepared from the following components of, by weight, 65-89 parts of deionizedwater, 5-25 parts of benzoyl peroxide or hydrogen peroxide, 1-25 parts of nanometer titanium dioxide and 0.1-0.5 part of tween-20 or fatty alcohol polyoxyethylene ether. The agent adopts the nanometer titanium dioxide as a redox catalyst, through irradiation with ultraviolet light or sunlight with the wavelength being shorter than 400 nm, the nanometer titanium dioxide absorbs light energy, by absorbing light energy, a large amount of photogenerated holes with strong oxidizing property are formed in a solution, and elementary silver oxide can be catalyzed by photogenerated holes into silver oxide; and meanwhile, a large amount of photogenerated electrons with high reducing property are produced through nanometer titanium dioxide, the photogenerated electrons can be annihilated by being reduced by oxidizing agents such as benzoyl peroxide or hydrogen peroxide, and secondary pollution is caused in the whole process. The agent used for silverware surface blackening is convenient to operate, heating is required, and the energy consumption is low.

Description

technical field [0001] The invention relates to a blackening agent, in particular to a silverware blackening agent and a blackening method thereof. Background technique [0002] In the modern silverware production process, potassium dichromate and other oxidizing substances can be used to soak the silverware to quickly form a black surface; artistically form a black substance adhesion layer on the surface of the silverware, which can make the silverware uniquely decorative. Another black silver blackening process is to melt the mixture of silver and sulfur on the silver jewelry, and form a covering layer in a glassy state. The black and silver are in stark contrast to the bright and clean silver, producing a special visual effect. [0003] However, the traditional black silver process is complicated to operate, and the preparation cost of black silver alloy is high; it takes too long for silver jewelry to be naturally worn or placed to blacken, and it cannot be processed; i...

AI Technical Summary

Problems solved by technology

For example, Chinese patent application 201510023846.1 discloses a silver blackening agent, including 1 to 3 parts of sodium sulfide, 2 to 5 parts of methionine, 1 to 3 parts of thiourea, 1 to 5 parts of ammonium chloride or ammonium sulfate, and sodium citrate. 1 to 5 parts, 10 to 20 parts of sodium sulfate, 1 to 2 parts of sodium hexametaphosphate, 0.1 to 0.2 parts of sodium lauryl sulfate; % aqueous solution, slightly inconvenient to use

[0005] There is also Chinese patent application 201710004779.8 which discloses a silverware blackening foam and its preparation method. Its components are: 3-5 parts of dimercaptopropanol, 2-5 parts of sodium sulfide, 1-3 parts of sodium hypophosphite 1 to 2 parts of ellagic acid, 12 to 15 parts of terpineol oil, 12 to 15 parts of potassium perfluorooctane sulfonate, and 20 to 25 parts of water; the production process is complex

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