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(State Key Laboratory of Metastable Materials Science and Technology,Yanshan University,Qinhuangdao 066004,China;Sino-Arab Chemical Fertilizer Co..Ltd.(SACF),Qinhuangdao 066003,China)

机构地区：[1]State Key Laboratory of Metastable Materials Science and Technology,Yanshan University,Qinhuangdao 066004,China [2]Sino-Arab Chemical Fertilizer Co..Ltd.(SACF),Qinhuangdao 066003,China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2012年第1期126-129,共4页武汉理工大学学报（材料科学英文版）

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

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.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.

关 键 词：polyurethane elastomer coated urea slow / controlled release fertilizer PARAFFIN 

分 类 号：TQ440.1[化学工程—化学肥料工业]