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摘要
[Background]: Super absorbent polymer (SAP) is a new type of polymer material. SAP is rich in hydrophilic groups, hence can absorb at least one hundred times of its own volume and swell while keeping the water from losing for a certain period of time. [Purpose]: This study aims to synthesize a new SAP for soil and forestry water conservation. [Methods]: In this paper, sodium alginate (SA) was used as the raw material, acrylic acid (AA) was used as the monomer, and N, N-methylene bisacrylamide (MBA) was used as the crosslinking agent. SA-g-AA SAP with three-dimensional network structure was prepared by co-radiation grafting. The chemical structures and surface morphologies of the SA-g-AA SAP were characterized by fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis and scanning electron microscope (SEM). [Results]: The results showed that when the temperature was 65 ℃, the absorbed dose was 5 kGy, the mass ratio of AA to SA was 5:1, the amount of the crosslinking agent MBA was 1.25 wt%, and the AA neutralization degree was 75%, the maximum water absorption ratio of the SA-g-AA SAP reached 579.8 g?g-1. After the water absorption reused for 7 times, its water absorption ratio maintained 92.5% of the initial value. It showed that the SA-g-AA SAP had good reusability of water absorption performance; after reaching the saturated water absorption ratio, water-retaining property could be retained for up to 15 days, which showed it had good water retention performance. [Conclusions]: This SAP material shows potential application in water retention and desertification control.
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