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采用外凝胶法制备含钴核壳双层微球,主要对其工艺过程中涉及的凝胶固化剂的种类、浓度和密度对凝胶球性能的影响等外凝胶技术控制机理进行分析。研究发现,使用Na OH溶液作为凝胶固化剂可迅速固化胶液,避免由于钴流失引起的钴含量不可控问题。研究还发现,在凝胶固化剂Na OH浓度为2 mol/L时,随着凝胶固化剂密度的减小,凝胶微球的球形度和粒径均匀性逐渐变好,当凝胶固化剂密度减小到0.99 g/cm3时,部分凝胶球发生较明显冲击变形,形成凹球,粒径均匀性及可控性变差。当凝胶固化剂密度为1.02 g/cm3时,该工艺获得的含钴核壳双层微球的球形度和粒径均匀性均较好。
The outer gel method is used to prepare double-layer microsphere containing cobalt core shell. The main control mechanism of the outer gel technique is the influence of the type, concentration and density of the gel curing agent involved in the process on the properties of the gel ball. The study found that the use of Na OH solution as a gel curing agent can quickly cure the glue, to avoid cobalt loss caused by uncontrollable cobalt content. The study also found that with the gel concentration of 2 mol / L, the sphericity and particle size uniformity of the gel microspheres become better with the decrease of the density of the gel curing agent. When the gel is solidified When the density of the agent is reduced to 0.99 g / cm3, some of the gel balls will have obvious impact deformation and concave balls will be formed, and the uniformity and the controllability of the particles will be deteriorated. When the density of the gel curing agent is 1.02 g / cm3, the spherical shape and particle size uniformity of the obtained cobalt-containing core-shell double-layer microspheres are good.