【摘要】 以丙烯酸为单体,K₂S₂O₈-Na₂SO₃为氧化-还原引发剂,通过自由基溶液聚合在常温下一步制备了尿素/秸秆基高吸水树脂复合材料。通过扫描电镜和红外光谱对材料进行了表征。扫描电镜表明薄片状的秸秆粉和针状的尿素结晶均匀分散在高吸水树脂基体中,红外光谱进一步证明了尿素与秸秆基高吸水树脂复合在一起。复合材料中的尿素含量可以通过反应体系中尿素的加入量方便进行控制。尿素质量分数为10%,30%和50%的尿素/秸秆基高吸水树脂复合材料吸水倍率分别为318.0,167.2和109.3 g/g。水中溶出实验和土壤淋溶实验结果表明,制备的尿素/秸秆基高吸水树脂具有良好的尿素缓释性能,在缓释肥料方面具有良好的应用前景。更多还原

【Abstract】 Urea/straw-based superabsorbent composites were prepared by radical solution polymerization with acrylic acid as the monomer and K₂S₂O₈-Na₂SO₃ as the initiator at room temperature. The materials were characterized by scanning electron microscope（ SEM） and Fourier transform infrared spectroscopy（ FT-IR）. The SEM images show that flake-like straw powders and needle-like urea crystals are uniformly embedded in the matrix of the superabsorbent resin. The FT-IR spectra further demonstrate the formation of the composite of urea and straw-based superabsorbent. The urea content in the urea/straw-based superabsorbent resin can be easily controlled by the amount of urea in the reaction system. The water absorption of the urea/straw-based superabsorbent resins with the urea mass fractions of 10%,30% and 50 wt% is 318. 0,167. 2 and 109. 3 g/g,respectively. The results of water dissolution experiment and soil column leaching experiment show that the prepared urea/straw-based superabsorbent composites exhibit good slow-release performance and are promising in slow-release fertilizer.更多还原