A kind of preparation method of polymer flocculant

Abstract

A method for preparing a polymer flocculant belongs to organic polymer technology; the method is: in a pure nitrogen environment, dissolve soluble starch in water, gelatinize at 80-95°C for 0.5-1h, and cool the reaction system to 55°C ‑65°C, add compound initiator cerium ammonium sulfate and ammonium persulfate, pre-initiate reaction for 10‑30min, add acrylamide for graft copolymerization reaction for 2‑4h, then cool down the reaction system to 35‑45°C, add cationic etherification Agent 2, 3-epoxypropyltrimethylammonium chloride, etherification reaction 2-3h, use absolute ethanol to dehydrate the polymer and wash away unreacted soluble starch, dry at 30-50°C, The ionic soluble starch grafted acrylamide macromolecule flocculant is obtained by grinding; the method has simple technological process, easy operation, high synthesis efficiency and low production cost, and the synthesized macromolecule flocculant product has excellent flocculation effect and wide application.

Description

technical field [0001] The invention belongs to organic polymer technology, and mainly relates to a preparation method of a polymer flocculant used for coal slime water treatment. Background technique [0002] At present, in coal preparation plants, the coagulation and sedimentation of coal slime water is mainly carried out by polymer flocculant polyacrylamide. Because the high molecular weight of polyacrylamide will cause the floc viscosity to increase, it will bring great difficulty to the subsequent dehydration and filtration of coal slime water. Miscellaneous acrylamide monomer is a toxic substance, and it will cause irreversible pollution to the environment. With the increase of polyacrylamide molecular weight, its price is also rising, and the production cost is increasing rapidly. In order to solve the problems in the above-mentioned prior art, a starch-grafted acrylamide flocculant has been developed in the laboratory. However, due to the complexity of the synthesis...

AI Technical Summary

Problems solved by technology

Because the high molecular weight of polyacrylamide will cause the floc viscosity to increase, it will bring great difficulty to the subsequent dehydration and filtration of coal slime water. Miscellaneous acrylamide monomer is a toxic substance, and it will cause irreparable pollution to the environment. With the increase of polyacrylamide molecular weight, its price is also rising, and the production cost is increasing rapidly.

In order to solve the problems in the above-mentioned prior art, a starch-grafted acrylamide flocculant has been developed in the laboratory. However, due to the complexity of the synthesis method of the flocculant, multi-step reactions are required to complete, and there are many by-products. It is easy to produce toxic substances during the synthesis process, the grafting rate is not high, and the overall cost is high. It is still in the laboratory stage and has not been popularized and applied in production practice.