Synthesis and properties of phosphate-free and alkali-resistant chelating dispersant

Due to the disadvantages of the existing chelating dispersant such as water eutrophication and hardly biodegradation,a high efficiency chelating dispersant containing many functional groups was prepared with itaconic acid,crylic acid,acrylamide,maleic acid,maleic anhydride and methyl methacrylate.The effects of the species and quantity of monomer,initiator dosage,reaction time and temperature on the chelating ability of the yielded product were analyzed,and its dispersing power and alkali resistance were measured.The experimental results showed that the copolymer had an excellent chelating ability when 8% by weight of the mass fraction of initiator in total monomers,reacting at(110 ℃) for(5 h,) and the chelating ability and dispersing power of the copolymer were remarkably affected by methyl methacrylate.When compared with other chelating dispersant,it has the best chelating ability with calcium and cuprum ions,along with good dispersing power,alkali resistance and biodegradation.