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以明胶和壳聚糖为主要原料,戊二醛为交联剂,采用反相乳化法制备载钾离子半互穿聚合物网络结构微球。考察了不同因素对微球中K_2O质量分数包封率的影响,确定了优化工艺条件。且在此优化条件下制备的微球K_2O的质量分数以及包封率分别为20.96%、28.13%。借助于傅里叶红外(FT-IR)、X-射线衍射(XRD)技术对微球进行了性能和结构表征。结果表明,明胶与壳聚糖之间形成互穿网络结构,K~+成功负载在微球中。通过缓释性测试发现,改变CS和交联剂用量可以调控K~+释放速率,且通过经验方程对数据进行拟合分析表明,微球中K~+释放符合菲克扩散模型,具有潜在缓释钾肥应用价值。
Gelatin and chitosan as the main raw material, glutaraldehyde as cross-linking agent, the use of reverse phase emulsification method to prepare potassium ion semi-interpenetrating polymer network microspheres. The influence of different factors on the entrapment efficiency of K 2 O in microspheres was investigated, and the optimum technological conditions were determined. The mass fraction of K 2 O and the entrapment efficiency of the prepared microspheres under the optimized conditions were 20.96% and 28.13%, respectively. The microspheres were characterized by means of Fourier transform infrared (FT-IR) and X-ray diffraction (XRD). The results showed that interpenetrating network structure was formed between gelatin and chitosan, K ~ + was successfully loaded in the microspheres. Through the controlled release test, it was found that changing the amount of CS and crosslinking agent can regulate the release rate of K ~ +, and the fitting analysis of the data by empirical equation shows that the release of K ~ + in the microsphere accords with the Fick diffusion model, Released potassium application value.