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A kind of galvanized combined brightener and preparation method thereof

A brightener and reactor technology, applied in the field of galvanized combined brightener and its preparation, can solve the problems of narrow bright range in the current density area, easy burning of the electroplating layer, and low cloud point of the brightener, etc., to achieve fast glazing, High cloud point, the effect of expanding brightness

Active Publication Date: 2015-09-30
陕西美坚默克高科技发展有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The brightener in the galvanizing solution can make the coating bright and fine. Most of the existing galvanizing combination brighteners use benzylidene acetone as the main brightener, but because it is slightly soluble in water, a large amount of surfactant needs to be added as a carrier. Make it emulsified, and the cloud point of the existing brightener is low, the bright range in the current density area is relatively narrow, and the electroplating layer in the high current density area is easy to burn

Method used

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  • A kind of galvanized combined brightener and preparation method thereof
  • A kind of galvanized combined brightener and preparation method thereof
  • A kind of galvanized combined brightener and preparation method thereof

Examples

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Effect test

Embodiment 1

[0031] Put fatty alcohol polyoxyethylene ether with a content of 100kg / t into the reactor, slowly add 95% sulfuric acid with a content of 50kg / t mass concentration under stirring, and the reaction time is 50 minutes. The reaction temperature was controlled at 65°C. After adding sulfuric acid, the material in the reactor is moved to another container with a pump or other tools, and then a 20% sodium hydroxide solution with a mass concentration of 100kg / t is added to the reactor to control The reaction temperature was 65° C. for 60 minutes. After the reaction, the pH value can be adjusted to 6.8 with a small amount of sulfuric acid or sodium hydroxide. Move all the products with a good pH value to the third container for precipitation and separation. After 30 minutes of precipitation, move the clear and transparent product on the top layer into the reaction kettle, and add o-chlorobenzene with a content of 50kg / t once under stirring Formaldehyde, sodium benzoate with a content...

Embodiment 2

[0033] Put the fatty alcohol polyoxyethylene ether with a content of 200kg / t into the reactor, slowly add 96% sulfuric acid with a content of 100kg / t mass concentration under stirring, and the reaction time is 40 minutes. Control the reaction temperature at 50°C. After adding sulfuric acid, use a pump or other tools to move the materials in the reactor to another container, then add 200kg / t of 30% sodium hydroxide solution into the reactor, and stir At the same time, the reaction product of the fatty alcohol polyoxyethylene ether and sulfuric acid was slowly added into the reaction kettle, and the reaction temperature was controlled to be 75° C. for 75 minutes. After the reaction, the pH value can be adjusted to 6.8 with a small amount of sulfuric acid or sodium hydroxide. Move all the products with a good pH value to the third container for precipitation and separation. After 45 minutes of precipitation, move the clear and transparent product on the top layer into the reacti...

Embodiment 3

[0035]Put fatty alcohol polyoxyethylene ether with a content of 300kg / t into the reactor, slowly add 98% sulfuric acid with a content of 150kg / t mass concentration under stirring, and the reaction time is 30 minutes. The reaction temperature was controlled at 40°C. After adding the sulfuric acid, use a pump or other tools to move the material in the reactor to another container, then add a 40% sodium hydroxide solution with a content of 300kg / t into the reactor, and stir At the same time, the reaction product of the fatty alcohol polyoxyethylene ether and sulfuric acid was slowly added into the reaction kettle, and the reaction temperature was controlled at 85° C. for 90 minutes. After the reaction, the pH value can be adjusted to 6.8 with a small amount of sulfuric acid or sodium hydroxide. Move all the products with a good pH value to the third container for precipitation and separation. After 60 minutes of precipitation, move the clear and transparent product on the top la...

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Abstract

The invention discloses a galvanized composite brightening agent and a preparation method thereof. The galvanized composite brightening agent consists of the following components: 100-300kg / t of fatty alcohol-polyoxyethylene ether, 50-150kg / t of 95-98% sulfuric acid, 100-300kg / t of 20-40% sodium hydroxide solution, 50-90kg / t of o-chlorobenzaldehyde, 50-100kg / t of benzoic acid, 3-10kg / t of nicotinic acid, 10-30kg / t of sodium benzoate and 5-30kg / t of a nno dispersing agent; the previous components, depending on a certain sampling order and under a certain reaction condition, are prepared into the galvanized composite brightening agent. The composite brightening agent can be applicable to a potassium chlorides or sulfate galvanizing solution, and is rapid to brighten, high in cloud point, capable of remarkably widening brightness of a current density zone, bright in full gloss in a low-current density zone, and good in brightness.

Description

technical field [0001] The invention relates to the field of electroplating, in particular to a galvanized combined brightener and a preparation method thereof. Background technique [0002] Zinc hardly changes in dry air, and the critical humidity of zinc corrosion is greater than 70%. Therefore, in a corrosive atmosphere, it can react with carbon dioxide and oxygen to form a film mainly composed of basic zinc carbonate. This film has a certain corrosion inhibition. Zinc is rich in resources and cheap, and the standard potential of zinc is higher than that of iron. It is an anodic coating for iron and can provide reliable electrochemical protection. The zinc coating has a beautiful appearance after chromate treatment, and its corrosion resistance is greatly improved. The types of galvanizing mainly include potassium salt galvanizing, sulfate galvanizing and cyanide galvanizing. Due to the large amount of highly toxic cyanide used in cyanide galvanizing, the wastewater and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D3/22
Inventor 段国敏
Owner 陕西美坚默克高科技发展有限责任公司
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