Montmorillonite modified melamine/chitosan painting mist coagulant

Abstract

The invention relates to a montmorillonite modified melamine / chitosan painting mist coagulant. The montmorillonite modified melamine / chitosan painting mist coagulant is characterized by being composed of an individually-stored montmorillonite modified melamine liquid and an acetic acid liquid of chitosan, wherein during use, a volume ratio of the montmorillonite modified melamine liquid to the acetic acid liquid of the chitosan is 1 to (0.2-1.0). A preparation method of the montmorillonite modified melamine liquid comprises the following steps: mixing a crosslinked polymer, which is generated by carrying out condensation reaction on melamine, urea and formaldehyde, with the montmorillonite liquid in a mass ratio of (1-5) to 1, regulating a pH value of the mixed liquid to 1.8-2.2 at a temperature of 40-50 DEG C, and ageing the mixed liquid. The painting mist coagulant has painting mist treatment efficiency over 95%; the raw materials are wide in source and low in price, small in dosage for treating paint-containing wastewater and obvious in cost performance advantage; and the preparation process is simple, convenient in treating spraying paint wastewater and simple in process.

Description

technical field

[0001] The invention belongs to the field of paint wastewater treatment, and relates to a montmorillonite-modified melamine / chitosan paint mist coagulant and its application in paint wastewater treatment. Background technique

[0002] With the rapid progress of modern chemistry, more and more attention has been paid to the research and development of flocculants. Now the research and development of flocculants shows the direction of polymer and composite multifunctional, and polysilicic acid modification is particularly prominent in this respect.

[0003] At present, the main coagulants are divided into two categories: organic and inorganic, and organic flocculants are the main ones. Organic flocculants have many advantages such as less dosage, strong flocculation ability, wide pH range, and good precipitation effect, but the price of this substance is high, and the residual monomers are biologically toxic, and some have "three-induced" effects (teratogenic,...

Examples

Embodiment 1

[0029] 1. Preparation of montmorillonite modified melamine solution:

[0030] According to the mass ratio of the reactants: melamine: urea: formaldehyde = 1:1:1, raise the temperature to 45°C, adjust the pH to 7.0, after all the melamine is dissolved, add sulfuric acid to adjust the pH to 2, and continue the reaction for 2 hours to obtain a clear and transparent The solution is the cross-linked polymer produced by the condensation reaction of melamine, urea and formaldehyde;

[0031] The aqueous solution of the montmorillonite is prepared by mixing sodium bicarbonate, polyaluminum chloride, montmorillonite and water uniformly in a mass ratio of 1:4:5:90.

[0032] Mix the cross-linked polymer produced by the condensation reaction of melamine, urea and formaldehyde with the montmorillonite aqueous solution at a mass ratio of 1:1, and adjust the pH of the mixed solution at a temperature of 40°C to 1.8, aging to obtain a montmorillonite-modified melamine solution.

[0033] 2...

Embodiment 2

[0041] 1. Preparation of montmorillonite modified melamine solution:

[0042] According to the mass ratio of the reactants: melamine: urea: formaldehyde = 1:1:2, raise the temperature to 55°C, adjust the pH to 7.5, after the melamine is completely dissolved, add sulfuric acid to adjust the pH to 2.5, and continue the reaction for 3 hours to obtain a clear and transparent The solution is the cross-linked polymer produced by the condensation reaction of melamine, urea and formaldehyde;

[0043] The sodium bicarbonate, polyaluminum chloride, montmorillonite and water are uniformly mixed in a mass ratio of 1:4:6:89 to prepare the montmorillonite aqueous solution.

[0044] Mix the cross-linked polymer produced by the condensation reaction of melamine, urea and formaldehyde with the montmorillonite solution at a mass ratio of 2:1, and adjust the pH of the mixed solution at a temperature of 42°C to 1.9, aging to obtain a montmorillonite-modified melamine solution.

[0045] ...

Embodiment 3

[0053] 1. Preparation of montmorillonite modified melamine solution:

[0054] According to the mass ratio of reactants: melamine: urea: formaldehyde = 1:1:3, raise the temperature to 65°C, adjust the pH to 8.0, after all the melamine is dissolved, add sulfuric acid to adjust the pH to 3.0, and continue the reaction for 4 hours to obtain clear and transparent The solution is the cross-linked polymer produced by the condensation reaction of melamine, urea and formaldehyde;

[0055] The aqueous solution of the montmorillonite is obtained after the sodium bicarbonate, the polyaluminum chloride, the montmorillonite and water are uniformly mixed in a mass ratio of 1:4:7:88.

[0056] Mix the cross-linked polymer produced by the condensation reaction of melamine, urea and formaldehyde with the montmorillonite solution at a mass ratio of 3:1, and adjust the pH of the mixed solution at a temperature of 45°C to 2.0, aging to obtain a montmorillonite-modified melamine solution. ...

technical field

[0001] The invention belongs to the field of paint wastewater treatment, and relates to a montmorillonite-modified melamine / chitosan paint mist coagulant and its application in paint wastewater treatment. Background technique

[0002] With the rapid progress of modern chemistry, more and more attention has been paid to the research and development of flocculants. Now the research and development of flocculants shows the direction of polymer and composite multifunctional, and polysilicic acid modification is particularly prominent in this respect.

[0003] At present, the main coagulants are divided into two categories: organic and inorganic, and organic flocculants are the main ones. Organic flocculants have many advantages such as less dosage, strong flocculation ability, wide pH range, and good precipitation effect, but the price of this substance is high, and the residual monomers are biologically toxic, and some have "three-induced" effects (teratogenic,...

Examples

Embodiment 1

[0029] 1. Preparation of montmorillonite modified melamine solution:

[0030] According to the mass ratio of the reactants: melamine: urea: formaldehyde = 1:1:1, raise the temperature to 45°C, adjust the pH to 7.0, after all the melamine is dissolved, add sulfuric acid to adjust the pH to 2, and continue the reaction for 2 hours to obtain a clear and transparent The solution is the cross-linked polymer produced by the condensation reaction of melamine, urea and formaldehyde;

[0031] The aqueous solution of the montmorillonite is prepared by mixing sodium bicarbonate, polyaluminum chloride, montmorillonite and water uniformly in a mass ratio of 1:4:5:90.

[0032] Mix the cross-linked polymer produced by the condensation reaction of melamine, urea and formaldehyde with the montmorillonite aqueous solution at a mass ratio of 1:1, and adjust the pH of the mixed solution at a temperature of 40°C to 1.8, aging to obtain a montmorillonite-modified melamine solution.

[0033] 2...

Embodiment 2

[0041] 1. Preparation of montmorillonite modified melamine solution:

[0042] According to the mass ratio of the reactants: melamine: urea: formaldehyde = 1:1:2, raise the temperature to 55°C, adjust the pH to 7.5, after the melamine is completely dissolved, add sulfuric acid to adjust the pH to 2.5, and continue the reaction for 3 hours to obtain a clear and transparent The solution is the cross-linked polymer produced by the condensation reaction of melamine, urea and formaldehyde;

[0043] The sodium bicarbonate, polyaluminum chloride, montmorillonite and water are uniformly mixed in a mass ratio of 1:4:6:89 to prepare the montmorillonite aqueous solution.

[0044] Mix the cross-linked polymer produced by the condensation reaction of melamine, urea and formaldehyde with the montmorillonite solution at a mass ratio of 2:1, and adjust the pH of the mixed solution at a temperature of 42°C to 1.9, aging to obtain a montmorillonite-modified melamine solution.

[0045] ...

Embodiment 3

[0053] 1. Preparation of montmorillonite modified melamine solution:

[0054] According to the mass ratio of reactants: melamine: urea: formaldehyde = 1:1:3, raise the temperature to 65°C, adjust the pH to 8.0, after all the melamine is dissolved, add sulfuric acid to adjust the pH to 3.0, and continue the reaction for 4 hours to obtain clear and transparent The solution is the cross-linked polymer produced by the condensation reaction of melamine, urea and formaldehyde;

[0055] The aqueous solution of the montmorillonite is obtained after the sodium bicarbonate, the polyaluminum chloride, the montmorillonite and water are uniformly mixed in a mass ratio of 1:4:7:88.

[0056] Mix the cross-linked polymer produced by the condensation reaction of melamine, urea and formaldehyde with the montmorillonite solution at a mass ratio of 3:1, and adjust the pH of the mixed solution at a temperature of 45°C to 2.0, aging to obtain a montmorillonite-modified melamine solution. ...