Novel efficient paint mist flocculant and preparation method thereof

A paint mist coagulant and coagulant technology, which is applied in the field of new high-efficiency paint mist coagulant and its preparation, can solve the problems of unsatisfactory removal effect of paint mist coagulant, high content of free formaldehyde, complicated preparation process, etc., and achieve obvious economical Benefits and promotion and application value, wide source of raw materials, effect of less dosage

Inactive Publication Date: 2014-06-11
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Nowadays, the high-molecular polymeric metal salt used in the paint mist coagulant is preferably aluminum-modified polyferric sulfate. The preparation process of the paint mist is complicated and the cost is high; while the paint mist coagulant prepared by the high-molecular cationic polymer has an unsatisfactory removal effect and is large Most of them contain formaldehyde, and the content of free formaldehyde is relatively high, which is harmful to water bodies and human bodies.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A preparation method of a novel high-efficiency paint mist coagulant, which comprises the following steps:

[0043] 1) Preparation of anti-viscosity agent A:

[0044] (1) Dilute sodium silicate with water to prepare a solution with a mass concentration of 20%; adjust the pH of the solution with sulfuric acid to make pH=2; adjust the temperature to 30°C, conduct polymerization for 1 hour, and then age for 1 hour to obtain solution D;

[0045] (2) Mix melamine and formaldehyde in a molar ratio of 1:1, raise the temperature to 50°C, add sulfuric acid to adjust the pH to 2 after the melamine is completely dissolved, and continue the reaction for 4 hours to obtain solution E (clear and transparent liquid);

[0046] (3) Preparation of auxiliary C (solution): hydrogen peroxide and ferrous salt (FeCl) were mixed in the laboratory 2 ) mixed with a molar ratio of 2:1, adding water according to the dosage of hydrogen peroxide as 50 mmol / L, and controlling pH=2 to obtain auxiliary...

Embodiment 2

[0059] A preparation method of a novel high-efficiency paint mist coagulant, which comprises the following steps:

[0060] 1) Preparation of anti-viscosity agent A:

[0061] (1) Dilute potassium silicate with water to prepare a solution with a mass concentration of 25%; adjust the solution with nitric acid to make the pH=3; adjust the temperature to 40°C, polymerize for 5 hours, and then age for 3 hours to obtain solution D;

[0062] (2) Mix melamine and formaldehyde in a molar ratio of 1:2, raise the temperature to 70°C, add nitric acid to adjust the pH to 2.5 after the melamine is completely dissolved, and continue to react for 5 hours to obtain solution E (clear and transparent liquid);

[0063] (3) Preparation of auxiliary C (solution): hydrogen peroxide and ferrous salt (FeCl) were mixed in the laboratory 2 ) mixed with a molar ratio of 2:1.5 and put into water, the dosage of hydrogen peroxide was 60 mmol / L, and the pH was controlled to be 2.5 to obtain auxiliary C;

[...

Embodiment 3

[0075] A preparation method of a novel high-efficiency paint mist coagulant, which comprises the following steps:

[0076] 1) Preparation of anti-viscosity agent A:

[0077] (1) Dilute sodium silicate with water to prepare a solution with a mass concentration of 40%; adjust the pH of the solution with hydrochloric acid to make pH=5; adjust the temperature to 50°C, conduct polymerization for 10 hours, and then age for 5 hours to obtain solution D;

[0078] (2) Mix melamine and formaldehyde in a molar ratio of 1:3, raise the temperature to 70°C, and after the melamine is completely dissolved, add hydrochloric acid to adjust the pH to 2.5, and continue the reaction for 5 hours to obtain solution E (clear and transparent liquid);

[0079] (3) Preparation of auxiliary C (solution): hydrogen peroxide and ferrous salt (FeSO) were mixed in the laboratory 4 ) mixed with a molar ratio of 3:1, adding water according to the dosage of hydrogen peroxide as 90 mmol / L, and controlling pH=2.5...

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Abstract

The invention relates to a chemical agent for removing excessively sprayed oil paint waste water and a preparation method of the chemical agent, a novel efficient paint mist flocculant is characterized by comprising an adhesive-eliminating agent A and a flocculant B in volume ratio of 0.5: (0.5-1), the adhesive-eliminating agent A is polysilicic acid modified tripolycyanamide prepared from tripolycyanamide, alkali metal silicate, aldehydes and an auxiliary C, the flocculant B is a polymer formed by non-ionic monomers through polymerization. The paint mist flocculant prepared by the method is low in free formaldehyde content, low in cost and high in paint mist removing rate.

Description

technical field [0001] The invention relates to a chemical agent for removing overspray paint waste water and a preparation method thereof, in particular to a formula and a process for preparing a novel high-efficiency paint mist coagulant by using polysilicic acid-modified melamine as a raw material. Background technique [0002] Nowadays, the high-molecular polymer metal salt used in the paint mist coagulant is preferably aluminum-modified polyferric sulfate. The paint mist preparation process is complicated and the cost is high; while the paint mist coagulant prepared by the high-molecular cationic polymer has an unsatisfactory removal effect, and large Most of them contain formaldehyde, and the content of free formaldehyde is relatively high, which is harmful to the water body and the human body. Therefore, in order to overcome some shortcomings of traditional coagulants, it is necessary to successfully develop a new and efficient paint mist coagulant with remarkable flo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/56
Inventor 曾德芳姜晓博陈沁徐浪
Owner WUHAN UNIV OF TECH
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