Environmentally friendly preparation of lignin/paraffin/epoxy resin composite-coated urea and evaluation for nitrogen efficiency in lettuce
Environmentally friendly preparation of lignin/paraffin/epoxy resin composite-coated urea and evaluation for nitrogen efficiency in lettuce
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DOI：
10.1016/j.ijbiomac.2022.09.112
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发表时间：
2022-09-15
影响因子：
8.2
通讯作者：
Sun, Shaolong
中科院分区：
文献类型：
--
作者：
Chen, Xiaojuan;Guo, Tao;Sun, Shaolong
成功制备了新型木质素/石蜡/环氧树脂复合包膜尿素(LPECCU)。采用石蜡和环氧树脂(ER)改善木质素基聚氨酯(LPU)包衣尿素的缓释性能。研究了LPECCU涂层材料中N的释放特性、液固比、-CNO/-OH摩尔比和成膜率之间的关系。结果表明，随着液固比(73.61~88.19)和-CNO/-OH摩尔比(65.17~82.24)的增大，LPU-石蜡的水接触角(WCA)增大。LPECCU的平均颗粒硬度随液固比(57.10~66.80N)的增大和-CNO/-OH摩尔比(48.11~63.00N)的减小而降低。通过添加石蜡和ER，LPECCU具有致密的微结构、低的缓释和高的抗压性能。LPECCU包衣材料在土壤中表现出良好的生物降解性。当液固比为1.43，-CNO/-OH摩尔比为2，成膜率为6.66%时，LPECCU的氮气累积释放率为72.49%。为进一步评价LPECCU的盆栽应用效果，进行了生菜生长研究。与常规尿素相比，LPECCU能提高生菜总干物质积累和氮素利用效率。
Novel lignin/paraffin/epoxy resin composite coated urea (LPECCU) was successfully prepared. Paraffin and epoxy resin (ER) were used to improve the slow-release properties of the lignin-based polyurethane (LPU) coated urea. The relationships among the N release characteristics, liquid-solid rate, -CNO/-OH molar rate and film formation rate in the coating material of LPECCU were investigated. The results showed that the water contact angle (WCA) of the LPU-paraffin increased with the rate of liquid-solid rate (73.61-88.19) and -CNO/-OH molar rate (65.17-82.24) increased. The average particle hardness of LPECCU decreased with the increased of liquid-solid rate (57.10-66.80 N) and the reduced of -CNO/-OH molar rate (48.11-63.00 N). The LPECCU emerged compact micro-structure, low sustained release and high compressive resistance by adding paraffin and ER. The coating material of LPECCU appeared excellent biodegradability in the soil. The optimal N cumulative release rate (72.49 %) of LPECCU was obtained (liquid-solid rate of 1.43, -CNO/-OH molar rate of 2, and the film formation rate of 6.66 %). The lettuce growth study was conducted to further evaluate the pot application of the LPECCU. In comparison to conventional urea, LPECCU could improve the total dry matter accumulation and N use efficiency of the lettuce.