SYNTHESIS OF POLYAMINE FLOCCULANT

Polyamine flocculants were synthesized by polycondensation of dimethylamine and epichlorohydrin with 1 ,2-diaminoethane as modifying agent. The influences of the amount of 1,2-diaminoethane, temperature, molar ratio of epichlorohydrin and dimethylamine, and time on the viscosity and cationic degree of polyamine flocculants were investigated. TEM and SEM were used to test the structure and figure of polyamine flocculants. The results show that when molar ratio of epichlorohydrin and dimethylamine is set as 1. 5: 1 and the amount of 1,2-diaminoethane is 3% , polyamine flocculants get the best viscosity and cationic degree and have excellent decoloration efficiency through the adsorption and subsequent formation of particle-polymer-particle bridges.