【摘要】 [目的]探讨聚乙烯醇(PVA)空心微球的优化制备条件及其在尿素缓释肥生产中的应用。[方法]采用乳状液化学交联法制备PVA空心微球,通过FT-IR、SEM和TEM等技术对其组成、形貌和粒径进行表征,探讨乳化剪切速率、交联反应温度和交联剂用量等因素对空心微球形貌和粒径的影响;以得到的最佳制备工艺条件为基础,通过包裹尿素制得PVA载肥微球,研究其对尿素的缓释作用。[结果]PVA空心微球制备的最佳工艺条件为乳化剪切速率6000 r/min、反应温度35℃和交联剂用量25 ml。PVA载肥微球具有明显的缓释作用,交联时间以3 h为宜。[结论]该研究为新型缓释肥的开发提供了理论依据。更多还原

【Abstract】 [Objective] The aim of this study was to discuss the optimizing preparation conditions of polyvinyl alcohol(PVA) hollow microsphere and its application in the production of slow-release urea fertilizer.[Method] PVA hollow microsphere was prepared by the emulsion chemical cross-linking method,and its composition,morphology and particle size were analyzed by technologies of FT-IR,SEM and TEM to discuss the effects of shearing rate,crosslink temperature and linking agent amount on morphology and particle size of hollow microsphere.Furthermore,based on the optimizing preparation conditions,PVA fertilizer carrier microsphere was prepared by coating urea to investigate its sustained release effect on urea.[Result] The optimizing preparation conditions of PVA hollow microsphere were as follows:shearing rate of 6 000 r/min,crosslink temperature of 35 ℃ and linking agent amount of 25 ml.PVA fertilizer carrier microsphere had significant sustained release effect on urea,and the optimal cross-linking time was 3 hours.[Conclusion] This study provides theoretical basis for the development of new slow-release fertilizer.更多还原