> PVC heat stabilizer technology of microencapsulation
PVC heat stabilizer technology of microencapsulation
2013-08-17 by seoer8
PVC as wall material, hydrotalcite, calcium / zinc composite PVC heat stabilizer as core material, preparation of efficient, environmentally friendly PVC composite stabilizer microcapsules, and discusses the optimal preparation of microcapsules. The results showed that the microcapsules was 15% solids, when the stirring speed of 600r/min, stirring time of 160min, the solvent of tetrahydrofuran and ethylene glycol non-solvent ratio of 5:3, the amount of emulsifier is 3% Span80 The resulting microcapsule structure, the particle size distribution 100 ~ 450μm. The thermal stability of microcapsules with a certain application prospects.
Through the following five aspects of research came to the conclusion. These five areas are: solid content of the microcapsules, the ratio of solvent and non-solvent effect of the microcapsules, the microcapsules stirring speed on impact, the stirring time of the microcapsules, the microcapsules emulsifier affected.
Conclusion: the optimal preparation of microcapsules for: Solid content 15%, stirring speed 600r/min, stirring time 160min, the solvent of tetrahydrofuran and the non-solvent weight ratio of 5:3 ethylene glycol, the amount of emulsifier Span80 3%, ambient temperature and pressure filtration and drying the particle size distribution can be obtained microcapsules 100 ~ 450μm. This thermal stabilizer microcapsules good compatibility with PVC, thermal stability and mechanical properties is further studies.