不同增效氮肥的制备及缓释性能研究

Study on preparation and slow release properties of different synergistic nitrogen fertilizers

尿素添加增效剂,采用圆盘造粒法制备增效氮肥,考察了增效剂种类、增效剂添加量、黏结剂种类及黏结剂添加量对增效尿素产品缓释性能的影响。借助于SEM、FTIR等表征技术,结合颗粒平均强度等性能测定分析产品的构效关系。实验结果表明,在静水环境中,增效剂选用质量分数为5%的硼酸、黏结剂选用质量分数为5%的CaCl_(2)制备出的肥料样品缓释性能最佳,在7 d内尿素态氮缓释率仅为81.54%;SEM显示,最优条件下所制备的肥料样品内部形成了三维网络结构;FTIR显示,样品中引入了钙离子,增效剂和黏结剂双重作用,使得尿素结构发生变化,提升了样品的氮缓释性能。

Using urea as raw material,synergist was added and synergist nitrogen was prepared by disk granulation method.The effects of synergist type,synergist amount,binder amount and binder type on the slow release of urea products were investigated.The structure-activity relationship of the product was analyzed by means of SEM,FTIR and other technical means,combined with the average particle strength and other properties.The results showed that in the static water environment,the slow-release performance of the fertilizer prepared by 5%boric acid as the synergist and 5%CaCl_(2)as the binder was the best,and the slow-release amount was only 81.54%within 7 d(the slow-release amount of urea group was 100%).SEM results showed that the fertilizer samples prepared under the optimal conditions formed a three-dimensional network structure.FTIR results showed that the introduction of calcium ions in the sample,under the double action of synergist and binder,the urea structure was changed,and the nitrogen release performance of the sample was improved.