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Paint mist coagulant

A technology of paint mist coagulant and floating agent, which is applied in the direction of flocculation/sedimentation water/sewage treatment, etc. It can solve the problems that paint mist cannot be completely removed, it is difficult to popularize and use, and the viscosity of paint is large, so as to improve the coating operation environment and facilitate Subsequent treatment, fast and effective detackification effect

Inactive Publication Date: 2010-09-15
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the methods used to clean overspray paint are mainly mechanical scraping method and adding paint mist coagulant method, and the former can not completely remove the paint mist due to the high viscosity of the paint. This method has low treatment efficiency, although the latter can improve the paint mist removal rate Reach more than 90%, but because the price of commercially available paint mist coagulant to treat wastewater is 3 yuan / ton of wastewater, the cost is relatively high, and it is not easy to promote and use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Add 200ml of water into a 500ml beaker, heat it in a water bath to 70°C, add dicyandiamide and formaldehyde into the water at a mass ratio of 1:1, stir to fully dissolve, then add 3ml of hydrochloric acid to adjust the pH of the reaction system To 3, after reacting for 1 hour, cool to 45°C and age for 3 hours to obtain viscosifying agent A.

[0018] Add nonionic polyacrylamide (a first-class industrial product produced by Mitsubishi, Japan) into water and stir at room temperature for 5 hours to prepare a solution with a mass concentration of 0.2% and denote it as B 1 Add sodium fluoride into water and stir at room temperature to prepare a solution with a mass concentration of 5%, then add 2 times diluted sulfuric acid to acidify the sodium fluoride solution for 3 days, and the solution obtained is denoted as B 2 ; Finally put B 2 Solution and B 1 The solution is compounded at a volume ratio of 1:3 to obtain the floating agent B.

[0019] Take 3ml of the anti-viscosit...

Embodiment 2

[0021] Add 200ml of water into a 500ml beaker, heat it in a water bath to 80°C, add melamine and acetaldehyde in a weight ratio of 1:2 into the water, stir to fully dissolve, then add 4ml of hydrochloric acid, and adjust the pH of the reaction system to 3 , After reacting for 1 hour, cool to 45°C and age for 4 hours to obtain viscosifier A.

[0022] Add anionic polyacrylamide (a first-class industrial product produced by Mitsubishi, Japan) into water and stir at room temperature for 5 hours to prepare a solution with a mass concentration of 0.3% and denote it as B 1 Add sodium silicate into water and stir at room temperature to prepare a solution with a mass concentration of 7%, then add sulfuric acid diluted 3 times to acidify the sodium silicate solution for 4 days, and the solution obtained is denoted as B 2 ; Finally put B 2 Solution and B 1 The solution is compounded at a volume ratio of 1:4 to obtain the floating agent B.

[0023] Take 3ml of the anti-viscosity agent ...

Embodiment 3

[0025] Add 200ml of water into a 500ml beaker, heat it in a water bath to 90°C, add urea and glyoxal into the water at a mass ratio of 1:3, stir to fully dissolve, then add 3ml of sulfuric acid to adjust the pH of the reaction system to 3 , After reacting for 1 hour, cool to 55°C and age for 5 hours to obtain viscosifying agent A.

[0026] Add cationic polyacrylamide (a first-class industrial product produced by Mitsubishi, Japan) into water and stir at room temperature for 5 hours to prepare a solution with a mass concentration of 0.4%, which is designated as B 1 Add sodium fluorosilicate to water and stir at room temperature to prepare a solution with a mass concentration of 8%, then add sulfuric acid diluted 4 times to acidify the sodium fluorosilicate solution for 5 days to obtain a solution that is denoted as B 2 ; Finally put B 2 Solution and B 1 The solution is compounded at a volume ratio of 1:5 to obtain the floating agent B.

[0027] Take 3ml of the anti-viscosity...

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PUM

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Abstract

The invention relates to a paint mist coagulant which has excellent adhesion eliminating and coagulating effects on water-soluble and fat-soluble paints and is particularly suitable for treating spraying paint waste water produced in a conventional coating process. The paint mist coagulant comprises an adhesion eliminating agent A and a floating agent B, wherein the adhesion eliminating agent A is a linear high polymer which contains a -NH- group and is generated by reacting an organic nitrogen-containing compound with aldehyde, has very high charge neutralization and can rapidly neutralize paint particle charge to make over 90 percent of paint lose adhesion within 1 to 10 minutes; and the floating agent B is solution which is formed by compounding an amide polymer having the molecular weight of between 9 and 10 million with modified sodium salt, has very strong coagulation and can aggregate paint particles which lose adhesion. When the paint mist coagulant is applied to treating the spraying paint waste water, the pH value of the waste water is adjusted to between 7 and 9 and the agent A and the agent B are added into paint-containing circulating water, so that over 95 percent of paint mist in the waste water is cleared.

Description

technical field [0001] The invention belongs to the field of industrial wastewater treatment and relates to the application of a paint mist coagulant in painting wastewater. Background technique [0002] With the development of modern coating technology, the amount of paint is increasing day by day. Usually, a large part of paint cannot be painted on the workpiece and becomes overspray paint, which seriously pollutes the surrounding air and environment. In order to effectively protect the environment and clean the construction site, a wet spray booth circulating water system is usually used in the painting industry to capture overspray paint. However, due to the viscosity of the paint, it will adhere to the water pump, pipes and fan blades, block the nozzles, etc., which will affect the normal operation of the purification system, and also affect the quality of spraying, reduce the purification efficiency of circulating water, and increase the number of replacements of circu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52
Inventor 曾德芳涂仁杰
Owner WUHAN UNIV OF TECH
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