A kind of liquid flocculant and preparation method thereof

Abstract

The invention discloses a preparation method of a liquid flocculant. The preparation method comprises the following steps of (1) mixing acrylamide, an quaternary ammonium monomer, a complexing agent and a cosolvent to obtain a mixture, and adding 40-60% of all water to the mixture; (2) adding a first initiator to a mixed solution obtained in the step (1) at 5-15 DEG C and in a nitrogen or inert gas atmosphere, reacting for 10-30min, adding a second initiator and then further reacting at 5-15 DEG C and in a nitrogen atmosphere for 1-5h; (3) heating the solution obtained in the step (2) to 30-50 DEG C, reacting for 2-5h, adding an organic amine monomer and further reacting for 1-2h; and (4) dropwise adding a cross-linking agent and the remaining water to the solution obtained in the step (3), controlling the temperature of the solution to be 60-90 DEG C and reacting for 2-10h to obtain the liquid flocculant. The preparation method is simple, the high-temperature energy consumption is reduced, and the prepared liquid flocculant is high in viscosity, high in cation degree and good in turbidity removal effect.

Description

Technical field [0001] The invention relates to the field of organic polymer flocculants, in particular to a liquid flocculant and a preparation method thereof. Background technique [0002] It has been reported in the literature that due to PDMDAAC-AM (a cationic organic polymer flocculant) and other polyquaternary ammonium salt polymers, the copolymer solution obtained in the late stage of the aqueous polymerization reaction has a very high viscosity, forming a gel, and it is difficult to obtain high Copolymers with solid mass fraction and ultra-large molecular weight, and the resulting product must be prepared as a powder product for use, high energy consumption, difficult to dry, and often agglomerated, which reduces the quality of the product. This is also encountered when synthesizing high polymers under aqueous solution conditions. To the common problem. Summary of the invention [0003] Based on this, the purpose of the present invention is to overcome the above-mentioned...

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Problems solved by technology

[0002] It has been reported in the literature that due to PDMDAAC-AM (a kind of cationic organic macromolecular flocculant) and other polyquaternium salt macromolecules, the viscosity of the copolymer aqueous solution obtained in the late stage of the aqueous polymerization reaction is very large, forming a gel, and it is difficult to obtain a high Copolymer with solid mass fraction and ultra-large molecular weight, and the obtained product must be prepared into a powder product for use, which has high energy consumption, difficult drying, and often agglomerates, which reduces the quality of the product. This is also the problem encountered when synthesizing polymers under aqueous solution conditions common problem

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