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Silver-tarnishing prevention agent

A technology of discoloration agent and wetting agent, applied in the direction of metal material coating process, can solve the problems of high cost, pollution, complex process of electroplating precious metals, etc., and achieve the effect of low cost, simple operation process and environmental friendliness

Inactive Publication Date: 2017-01-04
贵州苗妹银饰工艺品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the chemical passivation method is easy to cause Cr 6+ Pollution; Cr removal by electrolytic passivation 6+ In addition to pollution, it is also necessary to consider the installation of equipment and process issues related to electrification; most of the coating of solvent-based protective agents requires the use of harmful organic solvents such as trichloroethane; the process of electroplating precious metals is complicated and costly

Method used

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  • Silver-tarnishing prevention agent

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Anti-silver discoloration agent, which is: 4.2 g of tert-dodecyl mercaptan, 0.64 g of N-sulfathiazole thioglycolic acid, 1.8 g of benzotriazole, 0.2 g of morpholine, 4.2 g of nonylphenol polyoxyethylene ether g, 0.217 g of 2-hydroxy-4-n-octyloxybenzophenone, 0.143 g of 2-benzotriazol-2-yl-4,6-bis-tert-butylphenol, and 48 g of ethylene glycol.

[0023] The preparation method of the anti-silver discoloration agent is:

[0024] A: take 4.2g of tertiary dodecyl mercaptan, 1.8g of benzotriazole, 4.2g of nonylphenol polyoxyethylene ether and 31.2g of ethylene glycol to obtain composition A; take N-sulfathiazole thioglycolic acid 0.64g, morpholine 0.2g, 2-hydroxy-4-n-octyloxybenzophenone 0.217g, 2-benzotriazol-2-yl-4,6-bis-tert-butylphenol 0.143g and ethylene glycol 16.8g obtained composition B;

[0025] B: The composition A was mixed at a temperature of 75°C and stirred for 15 minutes at a rotational speed of 550 rpm;

[0026] C: After heating the composition B to 60° C., ...

Embodiment 2

[0028] Anti-silver discoloration agent: 5.4 g of n-octadecyl mercaptan, 0.51 g of N-sulfathiazole thioglycolic acid, 1.5 g of benzotriazole, 0.4 g of morpholine, 3.6 g of octylphenol polyoxyethylene ether g, 2-hydroxy-4-n-octyloxybenzophenone 0.227g, 2-(4,6-bis(2,4-dimethylphenyl)-1,3,5-triazin-2-yl )-5-octyloxyphenol 0.283g and ethylene glycol 57g.

[0029] The preparation method of the anti-silver discoloration agent is:

[0030] A: Take 5.4 g of n-octadecyl mercaptan, 1.5 g of benzotriazole, 3.6 g of octylphenol polyoxyethylene ether and 37.05 g of ethylene glycol to obtain composition A; take N-sulfathiazole thioglycolic acid 0.51g, morpholine 0.4g, 2-hydroxy-4-n-octyloxybenzophenone 0.227g, 2-(4,6-bis(2,4-dimethylphenyl)-1,3,5- Triazin-2-yl)-5-octyloxyphenol 0.283g and ethylene glycol 19.95g obtained composition B;

[0031] B: The composition A was mixed at a temperature of 75°C and stirred at a speed of 580 rpm for 12 minutes;

[0032] C: After heating the compositio...

Embodiment 3

[0034] Anti-silver discoloration agent: 1.537 g of tert-dodecyl mercaptan, 3.263 g of n-octadecyl mercaptan, 0.56 g of N-sulfathiazole thioglycolic acid, 1.68 g of benzotriazole, and nonylphenol Polyoxyethylene ether 1.846g, octylphenol polyoxyethylene ether 2.054g, morpholine 0.28g, 2-hydroxy-4-n-octoxybenzophenone 0.237g, 2-(4,6-bis(2,4 -Dimethylphenyl)-1,3,5-triazin-2-yl)-5-octyloxyphenol 0.213g and ethylene glycol 51g.

[0035] The preparation method of the anti-silver discoloration agent is:

[0036] A: Take 1.537 g of tert-dodecyl mercaptan, 3.263 g of n-octadecyl mercaptan, 1.68 g of benzotriazole, 1.846 g of nonylphenol polyoxyethylene ether, and 2.054 g of octylphenol polyoxyethylene ether and ethylene glycol 33.15g to obtain composition A; take N-sulfathiazole thioglycolic acid 0.56g, morpholine 0.28g, 2-hydroxy-4-n-octyloxybenzophenone 0.237g, 2-(4,6 -bis(2,4-dimethylphenyl)-1,3,5-triazin-2-yl)-5-octyloxyphenol 0.213g and ethylene glycol 17.85g to obtain compositi...

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Abstract

The invention relates to a silver-tarnishing prevention agent. The silver-tarnishing prevention agent is prepared from the following components in parts by weight: 4.2-5.4 parts of C12-C18 alkyl sulfhydryl, 0.51-0.64 part of N-sulfathiazole thioglycolic acid, 1.5-1.8 parts of benzotriazole, 0.2-0.4 part of morpholine, 3.6-4.2 parts of a wetting agent, 0.36-0.51 part of an ultraviolet light absorber and 48-57 parts of glycol. The silver-tarnishing prevention agent is capable of preventing a color changing phenomenon on the surfaces of pure-silver and silver-plating workpieces or products and has good protection performance, and meanwhile, various properties of silver-plating layers are not influenced; and furthermore, the operation process is simple, convenient, low in cost and environmentally friendly.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to an anti-silver discoloration agent. Background technique [0002] Due to the influence of oxygen, sulfide, etc. in the air, the surfaces of sterling silver and silver-plated workpieces or products are susceptible to corrosion. [0003] At present, there are chemical passivation, electrolytic passivation, coating solvent-based protective agent, electroplating of precious metals, etc. However, chemical passivation is easy to cause Cr 6+ Pollution; Cr removal by electrolytic passivation 6+ In addition to pollution, it is also necessary to consider the installation of equipment and process issues related to energization; most of the solvent-based protective agents need to use harmful organic solvents such as trichloroethane; electroplating precious metals is complicated and costly. SUMMARY OF THE INVENTION [0004] In view of this, the object of the present invention i...

Claims

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Application Information

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IPC IPC(8): C23C22/02
CPCC23C22/02
Inventor 唐胜兰
Owner 贵州苗妹银饰工艺品有限公司
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