A water-soluble copolymer of maleic acid (MA) and sodium methallyl disulfonate (SMADS) were synthesized by aqueous solution free radical polymerization and evaluated as scale inhibitor for barium sulfate. The copolymer was characterized by FTIR, HNMR, GPC and HPLC results verified the structure of MA-SMADS copolymer and molecular weight was about 1050 g/mol. The experimental results indicates that the optimal conditions for copolymer synthesis are 105 °C, monomer dosage 30% (wt) and sodium persulfate (NaPS) dosage 7%. The inhibition performance of polymer on barium sulfate was evaluated through static bottle test and the static inhibition rate on barium sulfate can reach up to 98%. Consequently, the evaluation criteria was carried out by dynamic scale loop test.

Using aqueous solution free radical polymerization with glacial acrylic acid (GAA), maleic anhydride (MA) and sodium methallyl disulfonate (SMADS), a novel linear polycarboxylate dispersant was synthesized for ceramics. Dispersant linear structural characterization was done by FTIR, 1 H NMR, HPLC and GPC, and the ratio of monomers was determined using an orthogonal experiment. This research is focused on the effects of polymerization temperature, monomer mole ratios and dosage of initiator on ceramic slurry viscosity with linear polycarboxylate dispersant for ceramic dosage rate of 0.30% (based on dry slurry), all of which were investigated by single factor test. The best polymerization conditions for linear GAA-MA-SMADS are when n(AA) : n(MA) : n(SMADS) equals 3.0 : 1.0 : 0.5, the molecular weight of the polymer is 4600 daltons, the initiator sodium persulfate accounts for 7% of the total mass of polymerized monomers, the polymerization temperature is 90°C and the reaction time is 2 h. The ceramic body slurry viscosity drops from 820 mPa•s to 46 mPa•s when the concentration of the polycarboxylate dispersant is 0.30%.

In this research, linear polycarboxylate of glacial acrylic acid (GAA), maleic acid (MA) and sodium methallylsulfonate (SMAS) dispersant polymer as a water reducer was synthesized for ceramic applications by using redox free radical initiation system consisting sodium persulfate (Na2S2O8) and sodium hypophosphite (Na2H2PO2) through aqueous solution free radical polymerization. The structural characterizations were done using FT-IR and 1 H NMR. The molecular weight of polymer was analyzed using GPC and residual monomer levels in final product were measured with HPLC. Measured the ceramic flow times, viscosities at dispersant dosage rate 0.30 % (dry slurry based) and the results indicated that linear polycarboxylate showed a good performance at the mol ratios of GAA:MA:SMAS = 60:20:20, ratios of initiator (Na2S2O8) and chain transfer agents (Na2H2PO2) 2:6 % at, 85 ºC polymerization temperature and 2 h reaction time.