Preparation of novel amphoteric starch-based flocculant
A novel type of amphoteric starch-based flocculant was prepared by grafting acrylamide,methacryloxyethyl trimethylammonium chloride and acrylic acid onto starch with through(NH4)2S2O8 as initiator.The structure of the graft copolymer was characterized by FT-IR,of which results confirmed three types of monomers were successfully grafted onto starch.In order to generate the flocculant with high charge density and optimum anionic/cationic ratios,the conditions were optimized through orthogonal test under the conditions of 1∶1∶1 molar ratio of three types of monomers,and 1∶2.47 mass ratio of starch to monomer.The optimized reaction conditions were as follows:25∶1 mass ratio of starch to ammonium persulfate,initiation time of 22 min,reaction temperature of 63 ℃,pH 4-5,and effective substance content of 17％in the polymerization system.Under the optimal reaction conditions,the total conversion rate of monomer was 99.15％,while the grafting rate of the graft copolymer reached 225％and the grafting efficiency reached 97.72％.The concentration of effective substances for preparing starch-based modified polymer flocculants in aqueous media was elevated,which was beneficial to reducing cost of storage and transportation.
国家科技期刊平台
NSTL
万方数据
维普
