Synthesis and Performance of Polyurethane Coated Urea as Slow/controlled Release Fertilizer

作     者：LI Qingshan WU Shu RU Tiejun WANG Limin XING Guangzhong WANG Jinming 李青山;WU Shu;RU Tiejun;王利民;XING Guangzhong;WANG Jinming

作者机构：State Key Laboratory of Metastable Materials Science and TechnologyYanshan UniversityQinhuangdao 066004China Sino-Arab Chemical Fertilizer Co..Ltd.(SACF)Qinhuangdao 066003China 

出 版 物：《Journal of Wuhan University of Technology(Materials Science)》 (武汉理工大学学报（材料科学英文版）)

年 卷 期：2012年第27卷第1期

页      面：126-129页

核心收录：

学科分类：081702[工学-化学工艺] 08[工学] 0817[工学-化学工程与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：the National Key Technology R&D Program of the 11th Five-Year Period (No.2006BAD10B08) 

主　　题：polyurethane elastomer coated urea slow / controlled release fertilizer paraffin 

摘      要：Polyurethane coated urea slow/controlled release fertilizer was prepared based on urea granules, isocyanate, polyols and paraffin. Isocyanate reacted with polyols to synthesize the polyurethane skin layer on urea granules surface. Paraffin serves as a lubricant during syntheses of polyurethane skin layers. The structure and nutrient release characteristics of the polyurethane skin layers were investigated by FTIR, SEM and TG. Urea nitrogen slow-release behavior of the polyurethane coated urea was tested. The experimental results indicated that compact and dense polyurethane skin layers with a thickness of 10-15 lam were formed on urea surface, the urea nitrogen slow-release time can reach 40-50 days. Paraffin proves to play a key role in inhibiting water to penetrate into urea, but excessive addition would decrease the polyurethane crosslinking density.