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Environment-friendly brightener for non-cyanide alkaline zinc plating and preparation method thereof

A cyanide-free alkaline galvanizing and brightener technology, applied in the field of electroplating additives, can solve the problems of high price and restrictions on wide-scale promotion and use, and achieve the effects of smooth surface, good dispersion and coverage, and simple maintenance

Active Publication Date: 2015-10-21
广东比格莱科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the 1980s, in order to meet the requirements of widely using low-chromium and ultra-low-chromium passivation technology, and to further improve the level of galvanizing technology, the electroplating industry has begun to use special organic synthetic galvanizing brighteners to obtain high-brightness plating surfaces , while the price of some combined electroplating additives imported from abroad is relatively high, which limits the wide-scale promotion and use

Method used

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  • Environment-friendly brightener for non-cyanide alkaline zinc plating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A preparation method of an environment-friendly brightener for cyanide-free alkaline galvanizing, prepared through the following steps:

[0022] S1. Add 10 parts of polyethyleneimine, 15 parts of imidazole propoxy condensate, 25 parts of nitrogen heterocyclic derivatives, 13 parts of modified aromatic aldehyde compounds and 400 parts of water into the reactor, and raise the temperature to 45°C;

[0023] S2. Add 70 parts of epichlorohydrin into the dropping funnel, slowly drop into the reactor in step S1 and stir for reaction. The reaction temperature does not exceed 45° C., and the dropping time is 3 to 5 h;

[0024] S3. After the epichlorohydrin is added dropwise in step S2, the temperature of the reactor is raised to 80° C., and the reaction is stirred for 6 hours to obtain an environment-friendly brightener for cyanide-free alkaline galvanizing.

Embodiment 2

[0026] A preparation method of an environment-friendly brightener for cyanide-free alkaline galvanizing, prepared through the following steps:

[0027] S1. Add 15 parts of polyethyleneimine, 20 parts of imidazole propoxy condensate, 30 parts of nitrogen heterocyclic derivatives, 18 parts of modified aromatic aldehyde compounds and 450 parts of water into the reactor, and raise the temperature to 45°C;

[0028] S2. Add 75 parts of epichlorohydrin into the dropping funnel, slowly drop into the reactor in step S1 and stir for reaction. The reaction temperature does not exceed 45° C., and the dropping time is 3 to 5 h;

[0029] S3. After the epichlorohydrin is added dropwise in step S2, the temperature of the reactor is raised to 80° C., and the reaction is stirred for 6 hours to obtain an environment-friendly brightener for cyanide-free alkaline galvanizing.

Embodiment 3

[0031] A preparation method of an environment-friendly brightener for cyanide-free alkaline galvanizing, prepared through the following steps:

[0032] S1. Add 20 parts of polyethyleneimine, 25 parts of imidazole propoxy condensate, 35 parts of nitrogen heterocyclic derivatives, 13~23 parts of modified aromatic aldehyde compounds and 500 parts of water into the reactor, and heat up to 45 ℃;

[0033] S2. Add 80 parts of epichlorohydrin into the dropping funnel, slowly drop into the reactor in step S1 and stir for reaction. The reaction temperature does not exceed 45° C., and the dropping time is 3 to 5 h;

[0034] S3. After the epichlorohydrin is added dropwise in step S2, the temperature of the reactor is raised to 80° C., and the reaction is stirred for 6 hours to obtain an environment-friendly brightener for cyanide-free alkaline galvanizing.

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Abstract

The invention relates to the technical field of electroplating additives and discloses environment-friendly brightener for non-cyanide alkaline zinc plating and a preparation method thereof. The brightener is prepared through polymine, IMZE, nitrogen heterocyclic derivatives, modified aromatic aldehyde compounds, epoxy chloropropane and water. According to the environment-friendly brightener for non-cyanide alkaline zinc plating and the preparation method thereof, the brightness of a galvanization layer is improved, the thickness of the galvanization layer can reach 30 micrometers, the galvanization layer is free of frangibility, and the dispersing power and the covering power of plating solution exceed those of traditional alkaline zinc plating brightener.

Description

technical field [0001] The invention relates to the technical field of electroplating additives, in particular to an environment-friendly brightener for cyanide-free alkaline galvanizing and a preparation method thereof. Background technique [0002] For a long time in the past, the cyanide galvanizing process has been widely used because of the good stability of the cyanide plating solution, strong throwing ability, fine coating, and good corrosion resistance. However, due to the severe hydrogen evolution in the cyanide galvanizing process, the galvanized layer is very brittle, and the cyanide galvanizing solution is highly toxic, the wastewater treatment is difficult, and the air and groundwater are seriously polluted. Galvanizing and weak acid galvanizing processes are gradually developed and used in industrial electroplating to replace cyanide galvanizing. Compared with the cyanide galvanizing process, the destructive power of the alkaline galvanizing process to the env...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/22
Inventor 陈楷城
Owner 广东比格莱科技有限公司
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