Preparation method of temperature-responsive hyperbranched block flocculant

Abstract

The invention discloses a preparation method of a temperature-responsive hyperbranched block flocculating agent. According to the method, pentaerythritol is used as a branching agent, N-isopropylacrylamide is used as a temperature-sensitive monomer, acryloyloxyethyl trimethyl ammonium chloride is used as a cationic monomer, and sodium polyacrylate is used as a template; the preparation method comprises the following steps: firstly, respectively adding N-isopropylacrylamide and acryloyloxyethyl trimethyl ammonium chloride into a reactor, adding a proper amount of distilled water, and stirring; after the monomers are completely dissolved, adding sodium polyacrylate, urea, pentaerythritol and tetraethoxysilane, and fully and uniformly mixing and completely dissolving under the condition of rapid stirring; adding a photoinitiator, namely, azobis (2-isobutylimidazoline) hydrochloride; introducing nitrogen into the reactor to remove oxygen; and finally, placing the reactor under the irradiation of a low-pressure ultraviolet mercury lamp to react for 4-6 hours. And after the reaction is finished, curing, and extracting and purifying a product, so as to obtain the temperature-responsive hyperbranched block flocculant. The reaction is stable, control is easy, side reactions are few, the obtained temperature-responsive hyperbranched block flocculant is good in dissolvability and pure in product, due to introduction of the temperature-responsive material, the settling speed of flocs in the flocculation process is increased, and the temperature-responsive hyperbranched block flocculant is an efficient water treatment flocculant.

Description

technical field [0001] The invention relates to the technical field of flocculants, in particular to a preparation method of a temperature-responsive hyperbranched block flocculant. Background technique [0002] With the rapid growth of population and the development of industrial economy, the shortage of water resources and water pollution caused by the problems have received widespread attention from the society. The importance of water resources issues and the necessity of water treatment are becoming increasingly prominent. There are many methods for wastewater treatment. Compared with other water treatment methods such as biological, chemical oxidation, ion exchange, electrolysis, electrodialysis, coagulation, because of its Easy to operate, cost-effective and widely used, especially in drinking water treatment, coagulation is also essential as a pretreatment. In the process of water treatment, coagulation mainly removes the suspended colloidal particles in the water b...

AI Technical Summary

Problems solved by technology

The surface of the flocculant material contains a large number of active amine groups and imino groups, which can be protonated or deprotonated to change the positive charge density on the surface, realize the adsorption of negatively charged pollutants, and achieve efficient flocculation. The preparation process is relatively complicated, and the mixing reaction needs to be stirred and mixed at 70~80°C during the preparation process. High temperature may affect the structure and performance of chitosan flocculant