Synthesis And Performance Study Of Salt-tolerant Polyacrylate Superabsorbent Polymer

The purpose of this paper is to improve the salt-tolerant performance ofpolyacrylate superabsorbent polymer. On the basis of previous study and combinedwith latest research results at home and abroad, we mainly investigate monomer andcross linker, the two main factors that affecting the water absorption ability ofsuperabsorbent polymer. We synthesized three polyacrylate superabsorbent polymerswhich all have high water absorption rate, water quantity, water retention and repeatbibulous rate performance. The following are the specific work content.(1) We take the variety of ionic and nonionic monomer, use different corss linkerto copolymerization with partly neutralized acrylic acid, and get three binarycopolymerization superabsorbent polymers which have excellent performances. Andthen, add the second commoner-APEG-into this binary copolymerization to ternarycopolymerization. Finally, the ternary copolymers we get have high salt waterresistance performance and its post-processing is simple.(2) The biopolymer superabsorbent polymer P(AA-co-PTAE) is synthesizedusing the inverse emulsion suspension polymerization, with partly neutralized acrylicacid, allyl pentaerythritol as monomers and N, N-methylene-bis-acrylamide as crosslinker. We studied various reactions by single factor analysis, such as acrylic acidneutralization degree, crosslinking agent and ratio of monomer feeding, and useL16(44) orthogonal experiment to optimize the synthesis process. The absorbency ofthe polymer product synthesized in the best proceed conditions is968.5g/g in distilledwater and90.87g/g in0.9wt%NaCl aqueous solution under the atmospheric pressure.(3)The biopolymer superabsorbent polymer P(AA-co-AMPS) is synthesizedusing the inverse emulsion suspension polymerization, with glycerol dimethacrylate(GDA) as cross linker, and2-acrylamide-2-methyl propane sulfonic acid (AMPS)as the monomer. Using L16(44) orthogonal experiment to optimize the synthesisprocess. The absorbency of the polymer product synthesized in the best proceedconditions is1730.2g/g in distilled water and189.64g/g in0.9wt%NaCl aqueous solution under the atmospheric pressure.(4) based on the process of our laboratory synthetic polyacrylate-maleic acidsuperabsorbent (P (AA-co-MA)), we introduce allyl alcohol polyoxyethylene ether(APEG) as the third monomer, and synthesized the ternary copolymer superabsorbentpolymer. The produce is easier to handle in the post-processing stage than thepolymer which was prepared by acrylic acid and maleic anhydride. The absorbencyof the polymer product synthesized in the best proceed conditions is1163.3g/g indistilled water and100.82g/g in0.9wt%NaCl aqueous solution under theatmospheric pressure, and its resistant to salt water performance is excellent.The internal structure, surface morphology and thermal properties have beencharacterized by infrared spectroscopy (FT-IR), thermo-gravimetric (TG-DTG) andscanning electron microscope (SEM).Furthermore, three salt-tolerant polyacrylate superabsorbent polymers wesynthesized were obtained the excellent properties of swollen hydrogel, such asstrength, resilience, dispersion, dry and crispy on the hydrogel surface.