控释肥包衣剂的制备及理化性质研究

为了获得控释肥包衣剂的制备条件、探明其理化性质，以2种树脂为成膜材料，探讨了成膜材料复合比、成膜材料用量、增塑剂用量、乳化剂用量等单因素对控释肥包衣剂制备效果的影响，运用正交实验L9(34)确定了控释肥包衣剂制备的最佳条件；并对其pH、粘度、成膜时间、成膜性、衣膜水溶性、包衣均匀度、包衣脱落率等理化性质进行了测定。结果表明，控释肥包衣剂的最佳制备条件：树脂JZ与BZ复合比1:1.5，成膜材料用量12%，增塑剂用量0.8%，乳化剂用量1.0%，色素用量0.08%，乙酸乙酯用量86.12%。理化性质测定结果显示：pH 5.21，粘度为21.1 MPa/s，成膜性良好，衣膜不溶于水，成膜时间为6 min，包衣均匀度95%，包衣脱落率<8%，表明所制备的控释肥包衣剂理化性质良好。

Studies on Preparation and Physico-chemical Properties of Coating-agent for Controlled-fertilizer

To obtain the preparation conditions and explore the physico-chemical properties of coating-agent for controlled-fertilizer, the single factor tests of the composite ratio of film-forming materials, the amount of film-forming materials, plasticizer, emulsifier and pigment were made with two resins as the film-forming materials, and the optimal preparation conditions of coating-agent for controlled-fertilizer were determined by orthogonal test L9(34). The physico-chemical properties of the pH, viscosity, film-forming time, film-forming properties, water solubility of coated film, coating uniformity, coating-off rate were measured. The results showed that, the optimal preparation conditions were as follows: the composite ratio (JZ:BZ) was 1:1.5, amount of film-forming materials was 12%, plasticizer was 0.8%, emulsifier was 1.0%, pigment was 0.08% and solvent was 86.12%. Test results of physico-chemical properties showed that, the pH was 5.21, viscosity was 21.1 MPa/s, the film was good and indissolvable in water, the film-forming time was 6 min, coating uniformity was 95%, coating-off rate was less than 8%, which indicated that the coating-agent for controlled-fertilizer had good physico-chemical properties.