Li Hongping, Yang Lanwen, Cao Jianxin, Nie Chenchen, Liu Hao, Tian Juan, Chen Wenxing, Geng Pinglan, Xie Guiming
School of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550025, China.
Key Laboratory of Guizhou Province for Green Chemical Industry and Clean Energy Technology, Guizhou University, Guiyang 550025, China.
Polymers (Basel). 2021 Aug 24;13(17):2844. doi: 10.3390/polym13172844.
Polyacrylic acid (PAA) has high water absorbency but poor salt resistance. Humic acid (HA) extracted from lignite was introduced into the cross-linked copolymer systems of AA to improve the water absorbency and salt-tolerance. A polyacrylic acid-potassium humate (PAA-KHA) coated ammonium dihydrogen phosphate (ADP) fertilizer with water-preserving, salt-resistant and slow-release properties was prepared. The main properties of HA extracted from lignite oxidized by HO were studied. Furthermore, the synthesis process, water absorbency of PAA-KHA in deionized water and in NaCl solution, morphologies of PAA-KHA, and the slow-release performance of the fertilizer (ADP@PAA-KHA) were investigated. The results showed PAA-KHA had a layered interpenetrating network, which can provide sufficient storage space for water and nutrients. The salty water absorbency of PAA-KHA increased by about 3 times compared to PAA. Both the PO and NH cumulative release of ADP@PAA-KHA with a coating rate of 10% in deionized water, were less than 20% within 24 h, and were 55.71% and 28.04% after the 15th day, respectively. The weight change of ADP@PAA-KHA before and after absorbing water was about 53 times in deionized water and about 4 times in 1 wt% of NaCl salty water. The results show that ADP@PAA-KHA has excellent properties of water retention, salt resistance and slow-release. This will efficiently improve the utilization of fertilizer and reduce the irrigation water consumption at the same time.
聚丙烯酸（PAA）具有高吸水性但耐盐性差。将从褐煤中提取的腐殖酸（HA）引入到丙烯酸（AA）的交联共聚物体系中，以提高吸水性和耐盐性。制备了一种具有保水、耐盐和缓释性能的聚丙烯酸钾腐殖酸盐（PAA-KHA）包覆磷酸二氢铵（ADP）肥料。研究了用HO氧化褐煤提取的HA的主要性质。此外，还研究了PAA-KHA的合成工艺、在去离子水和NaCl溶液中的吸水性、PAA-KHA的形态以及肥料（ADP@PAA-KHA）的缓释性能。结果表明，PAA-KHA具有层状互穿网络结构，可为水分和养分提供充足的储存空间。与PAA相比，PAA-KHA的盐水吸水性提高了约3倍。包覆率为10%的ADP@PAA-KHA在去离子水中PO和NH的累积释放量在24小时内均小于20%，在第15天后分别为55.71%和28.04%。ADP@PAA-KHA在吸水前后的重量变化在去离子水中约为53倍，在1 wt%的NaCl盐水中约为4倍。结果表明，ADP@PAA-KHA具有优异的保水、耐盐和缓释性能。这将有效提高肥料利用率，同时减少灌溉用水量。
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