Structure and properties of bio-based polyurethane coatings for controlled-release fertilizer

文献类型： 外文期刊

第一作者： Liao, Yun

作者： Liao, Yun;Guo, Sheng;Mi, Changhui;Cao, Bing;Liu, Li;Wu, Xiandong;Li, Kaiwen;Wang, Meng

作者机构：

关键词： applications; biopolymers and renewable polymers; surfaces and interfaces; structure-property relationships; polyurethane

期刊名称：JOURNAL OF APPLIED POLYMER SCIENCE （ 影响因子：3.125； 五年影响因子：2.754 ）

ISSN： 0021-8995

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收录情况： SCI

摘要： Two kinds of bio-based polyurethane coatings for controlled-release urea were prepared by in-situ polymerization used castor oil and liquefied starch as raw materials, respectively. Scanning electron microscopy (SEM) showed that the section morphology of castor oil based polyurethane (Castor-PU) coating was uniform and dense, and that of liquefied starch based polyurethane (Starch-PU) coating had certain proportion of microporous. Infrared spectroscopy (IR) showed that the two coatings had typical urethane characteristic structure, but the difference was that the Starch-PU had obvious unreacted isocyanate structure. Differential scanning calorimetry (DSC) showed that the glass transition temperature of the two coatings was around 58 degrees C, but the Castor-PU had a crystallization domain with obvious crystallization melting peak at 130 degrees C. Thermogravimetric analysis (TG) showed that the thermal stability of Castor-PU was significantly higher than that of Starch-PU. The controlled-release property test showed that when the coating ratio was 2.8%, the nutrient release longevity of urea coated with Castor-PU was 49 days and that of urea coated with Starch-PU was 14 days. The reasons for the poor controlled-release performance of Starch-PU were analyzed, which probably caused by concentrated sulfuric acid and hydrophilic dispersant added in the liquefied starch.

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