Experimental modeling of polymer latex spray coating for producing controlled-release urea
Experimental modeling of polymer latex spray coating for producing controlled-release urea
复制标题
用于生产控释尿素的聚合物乳胶喷涂实验模型
DOI：
10.1016/j.partic.2011.01.004
复制
发表时间：
2011-10-01
期刊：
影响因子：
3.5
通讯作者：
Jin, Yong
中科院分区：
文献类型：
--
作者：
Lan, Rui;Liu, Yonghui;Jin, Yong
在流化床中将聚合物乳液喷涂到肥料颗粒上生产控释尿素是一种环境友好的技术，因为它不需要任何有毒的有机溶剂。由于流化床中的喷涂过程在存在颗粒碰撞的情况下发生，颗粒的涂覆是随机的、间歇的和多次的，因此难以研究成膜过程。本文设计了一种实验模型装置，并利用该装置对喷涂过程中的关键因素进行了研究。该装置合理地简化了复杂的过程，以避免颗粒碰撞和涂层中的随机性。在实验装置中，采用周期性的涂布和脱水模拟流化床中的间歇涂布。获得大面积膜，并测量膜渗透性。研究了雾化气体流量、乳液喷雾速率、乳液固含量和雾化气体温度对涂膜结构和透气性的影响。研究发现，水的传递在喷涂过程中起主导作用。(C)2011年中国科学院颗粒学会、过程工程研究所。Elsevier B.V.出版，保留所有权利。
Spray coating of polymer latex onto fertilizer particles in a fluidized bed for producing controlled-release urea is an environment friendly technology as it does not need any toxic organic solvent. Since the spray coating process in a fluidized bed occurs in the presence of particle collisions, the coating of the particles is random, intermittent and multiple, thus making it difficult to investigate the film formation process. In this paper, an experimental model apparatus was designed and used to investigate the effects of the key factors in the spray coating process. This apparatus reasonably simplified the complex process to avoid particle collisions and randomness in the coating. The intermittent coating in the fluidized bed was modeled by periodic coating and dewatering in the experimental apparatus. A large area film was obtained, and the film permeability was measured. The effects of atomizing gas flow rate, spray rate of latex, solid content of latex and gas temperature on film structure and film permeability were investigated. It was found that water transfer played a dominant role in the spray coating process. (C) 2011 Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.