肥料用聚苯乙烯包覆膜的制备及其性能的研究

利用废弃聚苯乙烯泡沫塑料为主要材料，对尿素进行包膜来生产缓释化肥。筛选乙酸乙酯或甲苯为溶剂，邻苯二甲酸二丁酯为的增塑剂降低聚苯乙烯的脆性，SBS树脂为增强剂提高聚苯乙烯膜的附着力。结果表明，包膜液的浓度12 %，增塑剂的用量3 %，增强剂用量1 %，包膜肥料的包膜量为10 %。用氮素水中溶出率法和土壤淋溶法研究包膜尿素缓释效果，肥料初期溶出率均低于40 %，在土壤中累计溶出率比普通尿素有大幅降低。说明聚苯乙烯经过改性后对尿素包膜，制得缓释肥的缓释性能良好。

Preparetion and Properties of polystyrene film for Fertilizers' Encapsulation

Waste foamed polystyrene was used as the main materials to produce coated fertilizer of urea. Ethyl acetate or toluene was the solvent. Dibutyl phthalate was selected as plasticizer to reduce the brittleness of polystyrene. SBS resin was used as enhancer to improve the adhesion of polystyrene film. The concentration of coating solution was 12 %, containing 3 % plasticizer and 1 % enhancer. The amount of coated materials was 10 %. Dissolution rate of nitrogen in the water and soil was determined. The initial dissolution rate of slow-release fertilizers in water was lower than 40 % and the cumulative dissolution rate in soil was significantly lower than that of no-coated urea.