T型混合反应器内共沉淀法制备吡啶硫酮铜

在T型混合反应器内通过喷射共沉淀方法合成了吡啶硫酮铜(CPT).利用扫描电镜和小角度光散射实验手段研究了分散液中吡啶硫酮铜的形貌和大小。通过喷射共沉淀方法获得的初级吡啶硫酮铜颗粒为棒状, 在分散液中这些棒状颗粒易发生团聚, 形成分形维数为2.1的团聚体。用平均回转半径(R_g)表征分散液中团聚体的平均大小, 考察了反应温度和反应物化学计量比(吡啶硫酮钠/硫酸铜)对团聚体大小的影响, 随着反应温度的降低, 团聚体的回转半径逐渐减小;过量的吡啶硫酮钠也有利于降低团聚体的大小, 当吡啶硫酮钠过量量达到~25%时, 进一步增大吡啶硫酮钠的过量量, 团聚体的回转半径不再发生明显变化。

Synthesis of Copper Pyrithione by Co-precipitation Method in Tee Mixer Reactor

This work aims to develop a jet co-precipitation process in a tee mixer reactor to synthesize copper pyrithione (CPT). The morphology and size of CPT in dispersion were investigated by using SEM and small angle light scattering (SALS). The rod-like primary particles were obtained via the jet co-precipitation process. These primary particles tend to form aggregates with a fractal dimension of 2.1 in aqueous solutions. The effect of the reaction temperature and stoichiometry ratio of sodium pyrithione (SPT)/CuSO₄ on the size of particles aggregates was studied. Decreasing the reaction temperature can reduce the size of the aggregates in terms of average radius of gyration, <R_g>. The excess of SPT is also beneficial to reducing <R_g>. When SPT excess reaches a certain value, e.g. ~25%, <R_g> decreases slightly with a further SPT excess.