Synthesis And Flocculation Performance Of The Hydrophobic Cationic Starch Modified Flocculant

Natural modified polymer flocculant, as a kind of ecological and safe flocculant, are paid attention to in recent years and developping in application. Starch molecular structure contains a lot of hydroxyl, can through graft modifying to obtain benign flocculation capability. In my research, we take into account to use soluble starch as the base material, introducing AM as macromolecule framework, DMDAAC as cation group, MMA as the hydrophobic group to synthesis the hydrophobic and cationic starch modified flocculant with new and good efficiency. The graft copolymer possessed both favorable qualities of starch and artificial synthesis macromolecule. Its active group strengthens greatly and the polymer presents a branch structure, disperse the group of flocculating, make it have stronger absorb, bridge, roll and sweep function for the particulate to suspension system; And the flocculant also possessed the properties of hydrophobically associating polymers. It is helpful for the interaction of the macromolecules, reduce hydrophile capability of the floccule, accelerate its sedimentation rate, reduce volume, improve the floccule's intensity and dehydrated ability of mud.Choosing ethanol as mutual solvent and adopt stimulant symmetrical polymerization in an aqueous solution, the effects of starch and monomers quality scale, monomer concentration, initiator ratio, urea ratio and etc on the graft copolymerization reaction were studied , and determined the best synthetic process conditions of quapolymers P (S-AM-DMDAAC-MMA) : Starch and monomer total quality are 50%(wt), starch and monomers quality scale is 1:3, the graft monomers ratio is AM: DMDAAC: MMA =83.5: 15: 1.5(mol), initiator ratio is 0.9‰(wt), 1.5%(wt) of urea ratio, ethanol 3ml, reaction temperature 45℃, acidity control in pH value is 5～6, reaction time is 3 hours. The polymer's grafting degree approached 132.7%, grafting efficiency approached 92.3%. The experiment mensurated the relative quality of the production can reach 2, 941, 000, cation degree is 25.84%, and composition and structure of the quapolymers were characterized by infrared spectrum.During the process of study, the production's flocculation capability was evaluated in...