Relationship between starch liquefaction behavior and properties of polymer coated urea from liquefied starch
文献类型： 外文期刊
作者： Li, Lixia 1 ; Geng, Keqi 1 ; Liu, Dongsheng 1 ; Song, Huaihe 3 ; Hongyan, Li 1 ;
作者机构： 1.Beijing Acad Agr & Forestry Sci, Inst Plant Nutr & Resource, Beijing 100097, Peoples R China
2.Res Ctr Beijing Municipal Slow & Controlled Relea, Beijing 100097, Peoples R China
3.Beijing Univ Chem Technol, State Key Lab Chem Resource Engn, Beijing 100029, Peoples R China
关键词： Coated urea; Liquefaction; Starch; Bio-polyol; Degradation
期刊名称：PROGRESS IN ORGANIC COATINGS （ 影响因子：5.161； 五年影响因子：4.769 ）
ISSN： 0300-9440
年卷期： 2020 年 147 卷
页码：
收录情况： SCI
摘要： The relationship between starch liquefaction behavior and properties of coated urea was explored to give some insights into the optimized technical selection of bio-polyol for polymer coated urea. The liquefied corn starch was monitored for insoluble residue content, viscosity, acid value and hydroxyl value. Nitrogen release, water permeability and biodegradation properties of coating material were also studied. FTIR and 1H-NMR results revealed that alcoholysis, hydroxyalkylation and side reactions co-existed during the liquefaction process, and side reactions predominated as the process continued. It was found that re-condensation leading to the increase of polyester polyols was beneficial for subsequent coating of urea according to the nitrogen release and biodegradation performance. The selected bio-polyols derived from starch can be available to prepare polymer coated urea being more accordant with the nutrient requirement of plants at growth stages.
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