Preparation and Properties of High Absorbent Resin Modified by Bamboo Liquefaction Residue
In order to verify the feasibility of bamboo liquefaction residue as cellulose source to modify highly absorbent resin,this study was carried out by microwave irradiation method,using potassium persulfate(KPS)as free radical initiator,and under the action of N,N'-methylene bisacrylamide(MBA).Bamboo liquefaction residue(BLR),acrylic acid(AA),polyvinyl alcohol(PVA)and 2-acrylami-2-methylpropanesulfonic acid(AMPS)were subjected to four-element copolymerization.The structure and morphology of the products were characterized by Fourier transform infrared spectroscopy(FT-IR),thermogravimetric analysis(TG)and scanning electron microscopy(SEM).The optimum preparation process of BLR modified highly absorbent resin(BLR-P(AA-AMPS)/PVA)was determined by single factor and orthogonal test.The results showed that the addition of BLR increased the internal porous structure of BLR-P(AA-AMPS)/PVA resin,and the water absorption property of the resin was significantly improved.The optimal processing conditions of BLR-P(AA-AMPS)/PVA resin were as follows:microwave irradiation power of 500 W,microwave irradiation time of 12 min,initiator dosage of 0.6％,crosslinking agent dosage of 0.1％,acrylic neutralization degree of 85％,and polyvinyl alcohol dosage of 1.5％,and BLR dosage of 0.35 g.Under the optimal conditions,the absorption ratio of distilled water could reach 1 526 g/g,the absorption ratio of normal saline was up to 114 g/g,and the centrifugal water retention rate was 60％at 5 000 r/min.The water absorption process accorded with the second-order kinetic model.
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