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Cationic flocculant and preparation method thereof

A cationic flocculant and catalyst technology, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of instability, high viscosity, release of harmful formaldehyde gas, etc., to achieve good stability, good flocculation effect, pH resistance good effect

Active Publication Date: 2015-03-25
GUANGZHOU ZHENQING ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Secondly, melamine resin itself is non-toxic, but because melamine resin is synthesized with melamine and formaldehyde as the main raw materials, some free formaldehyde will remain in the resin, and the irritation and toxicity of formaldehyde have been determined by the World Health Organization as suspected carcinogenic or carcinogenic. deformity
Third, since the melamine resin also contains hydroxyl (-OH) and imino groups (-NH-) with strong reactivity, these active groups will undergo cross-linking reactions with each other during storage, gradually forming a viscous, Water-insoluble flocs or gels become very unstable, resulting in reduced storage stability of melamine resin
However, there are also disadvantages such as poor precipitation or air flotation effect, and harmful formaldehyde gas will be released during production, use, and storage, which restricts the application and promotion of this product in the field of wastewater treatment.

Method used

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  • Cationic flocculant and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A cationic flocculant prepared by the following method:

[0031] 1) Add 30 parts of water into the reaction kettle, adjust the pH value to 9, then add 40 parts of glyoxal, stir and heat up to 30°C;

[0032] 2) Add 10 parts of melamine to the above reaction kettle, stir while adding, then add 5 parts of catalyst, stir, heat up to 65°C and react for 2 hours;

[0033] 3) Control the temperature in step 2) to remain unchanged, add 0.1 part of polymerization inhibitor, and stir for 1 hour until the reaction is complete;

[0034] 4) Cool to room temperature.

Embodiment 2

[0036] A cationic flocculant prepared by the following method:

[0037] 1) Add 30 parts of water into the reaction kettle, adjust the pH value to 9, then add 50 parts of glyoxal, stir and heat up to 30°C;

[0038] 2) Add 12 parts of melamine to the above reaction kettle, stir while adding, then add 5 parts of catalyst, stir, heat up to 60°C and react for 4 hours;

[0039] 3) Control the temperature in step 2) to remain unchanged, add 0.3 parts of polymerization inhibitor, and stir for 1 hour until the reaction is complete;

[0040] 4) Cool to room temperature.

Embodiment 3

[0042] A cationic flocculant prepared by the following method:

[0043] 1) Add 60 parts of water into the reaction kettle, adjust the pH value to 10, then add 65 parts of glyoxal, stir and raise the temperature to 40°C;

[0044] 2) Add 15 parts of melamine to the above reaction kettle, stir while adding, then add 10 parts of catalyst, stir, heat up to 65°C to react, and react for 2 hours;

[0045] 3) Control the temperature in step 2) to remain unchanged, add 0.1 part of polymerization inhibitor, and stir for 1 hour until the reaction is complete;

[0046] 4) Cool to room temperature.

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Abstract

The invention discloses a cationic flocculant and a preparation method thereof. The cationic flocculant is polymerized from 10-15 parts by weight of melamine, 40-65 parts by weight of glyoxal, 5-10 parts by weight of catalyst, 0.1-0.5 part by weight of polymerization inhibitor and 30-60 parts by weight of water. The cationic flocculant provided by the invention has the advantages of good stability and excellent resistance to acids and bases; and the cationic flocculant is used for substituting for the melamine resin type flocculants used at present such as polyacrylamide (PAM), dimethyl diallyl ammonium chloride, melamine-formaldehyde, dicyandiamide-formaldehyde condensation polymer and the like; therefore, an excellent flocculating settling effect is achieved while the dosage is reduced.

Description

technical field [0001] The invention relates to the technical field of flocculants, in particular to a cationic flocculant and a preparation method thereof. Background technique [0002] Melamine formaldehyde resin (also known as melamine resin) is abbreviated as MF in English. It is a synthetic resin polymerized with melamine (also known as melamine) and formaldehyde. It can be hardened and shaped after heating. It is a thermosetting resin with flame retardant properties. , water resistance, heat resistance, aging resistance, arc resistance, chemical corrosion resistance, good insulation performance, gloss and mechanical strength, etc., are widely used in wood, plastics, coatings, paper, textiles, leather, electrical, medicine, etc. industry. Due to the unique rigid structure of the triazine ring, it has been used in many fields. Secondly, melamine resin itself is non-toxic, but because melamine resin is synthesized with melamine and formaldehyde as the main raw materials...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G12/32C02F1/56
Inventor 宋澄章梁国辉叶涛饶丹
Owner GUANGZHOU ZHENQING ENVIRONMENTAL PROTECTION TECH
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