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Silver plating brightening agent and preparing method thereof

A technology of silver light and surfactant, applied in the field of silver-plated brightener and its preparation, can solve the problems of uneven silver-plated layer, poor brightening effect of brightener, poor gloss and the like

Active Publication Date: 2015-11-11
广州皓悦新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the silver plating brighteners commonly used in the silver plating process are mainly sulfur-containing organic brighteners. This type of brightener has a wide range of bright current density and a high upper limit of operating humidity, but the brightening effect of this type of brightener is poor. Plating The silver layer is uneven and the gloss is poor

Method used

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preparation example Construction

[0012] The invention provides a kind of preparation method of silver plating brightener, this method comprises:

[0013] (1) Prepared by mixing propanesulfonic acid pyridinium salt, 1,4-butynediol, chitosan, nonylphenol polyoxyethylene ether, potassium dihydrogen phosphate, nitric acid, citric acid, anionic surfactant and water mixture M1;

[0014] (2) adding ammonia water dropwise to the mixture M1 to adjust the pH to 4.5-6 to prepare the mixture M2;

[0015] (3) heat-treating the mixture M2 to prepare a brightener for silver plating.

[0016] In the present invention, the weight-average molecular weight of nonylphenol polyoxyethylene ether can be selected within a wide range. The weight average molecular weight of vinyl ether is 22000-28000.

[0017] Of course, in step (1), the consumption of each component can be selected in a wide range, in order to make the synergistic reaction carry out faster and make the brightness of the silver-plated brightener made more excellent...

Embodiment 1

[0024] (1) At 25°C, mix 100g propanesulfonic acid pyridinium salt, 65g 1,4-butynediol, 45g chitosan, 25g nonylphenol polyoxyethylene ether (weight average molecular weight 25000), 35g diphosphate Potassium hydrogen, 50% by weight of nitric acid 8g, 12g citric acid, 6g sodium dodecylbenzenesulfonate and 220g water are mixed to prepare the mixture M1;

[0025] (2) adding ammonia water dropwise to the mixture M1 to adjust the pH to 5 to prepare the mixture M2;

[0026] (3) The mixture M2 was heat-treated at 70° C. for 40 minutes to prepare the silver-plated brightener A1.

[0027] The silver plating brightener is used for electroplating, and the appearance of the silver plating layer is shown in Table 1.

Embodiment 2

[0029] (1) At 25°C, 100g propanesulfonic acid pyridinium salt, 55g 1,4-butynediol, 40g chitosan, 20g nonylphenol polyoxyethylene ether (weight average molecular weight 22000), 25g diphosphate Potassium hydrogen, 45% by weight of nitric acid 6g, 8g citric acid, 2g sodium lauryl sulfate and 150g water are mixed to prepare mixture M1;

[0030] (2) adding ammonia water dropwise to the mixture M1 to adjust the pH to 4.5 to obtain a mixture M2;

[0031] (3) The mixture M2 was heat-treated at 60° C. for 60 minutes to prepare silver-plated brightener A2.

[0032] The silver plating brightener is used for electroplating, and the appearance of the silver plating layer is shown in Table 1.

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Abstract

The invention discloses a silver plating brightening agent and a preparing method thereof. The preparing method comprises the steps that (1) pyridinium propyl sulfobetaine, 1,4-butynediol, chitosan, nonylphenol polyoxyethylene ether, monopotassium phosphate, nitric acid, citric acid, anion surface active agents and water are mixed to obtain a mixture M1; (2), ammonia water is dropwise added into the mixture M1, the pH is adjusted to be 4.5-6, and a mixture M2 is obtained; and (3) heat treatment is conducted on the mixture M2, so that the silver plating brightening agent is obtained. The brightening effect of the silver plating brightening agent prepared through the method is excellent during electroplating, and a silver-plated layer obtained through electroplating is smooth and good in glossiness.

Description

technical field [0001] The invention relates to the field of electroplating silver, in particular to a brightener for silver plating and a preparation method thereof. Background technique [0002] In order to make the workpiece to be plated have higher conductivity, light reflection and chemical stability to organic acids and alkalis, precious metals are usually electroplated on the workpiece to be plated, because the cost of the silver-plated layer is relatively lower than that of the gold-plated layer, so it is widely used. It is used for functional electroplating such as decorative electroplating electronic devices. In the silver plating process, the silver plating layer on the surface of the workpiece to be plated will appear dull and dull. The existing process usually adds a brightener to the silver plating layer to solve the surface problem. The problem of darkening is that the brightener forms an almost complete adsorption monolayer on the surface of the plated part, ...

Claims

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Application Information

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IPC IPC(8): C25D3/46
Inventor 沈福建江豪褚诗泉纪沿海
Owner 广州皓悦新材料科技有限公司
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