The carboxymethyl cellulose (CMC) and acrylic acid (AA) were used as raw materials,potassium persulfate (KSB) as the initiator,N,N-methylene diacrylamide (MBA) as crosslinking agent,and the water solution polymerization was adopted to prepare the CMC-AA high absorbent resin.On this basis,potassium hydroxide and UREA were introduced into the reaction system,and functional composite absorbent resin K-CMC-AA and UREA-CMC-AA were prepared respectively.The optimal dosages of KOH and urea were determined by single factor experiment.The morphology and structure of products were characterized by scanning electron microscope (SEM) and Fourier infrared spectroscopy (FT-IR).The adsorption process and mechanism of the adsorption process were discussed by using kinetic model.The sustained release properties of UREA-CMC-AA in water were studied.The results showed that:when the blending ratio of KOH were 10%,the water absorption ratio of K-CMC-AA in 0.9% NaCl was 285.06g/g,which was about 80% higher than CMC-AA.When the quality ratio of urea and monomer CMC was 1∶1,the water absorption (brine) rate of the resin was the highest,while the resin also has good nitrogen release function.The water absorption kinetics of three kinds of products in distilled water or salt solution can be described by quasi-second-order kinetic equation.
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基金资助
国家重点研发计划项目(2016YFC0502402)
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