Mathematical model for erupting flux of spinning dope
Bian Li-hua · Chemical Engineering(China) · 2008
The erupting flux of spinning dope has a great influence on the morphology and performance of hollow fiber membrane.It has close relation with its viscosity and its pressure.Taking dimethylformamide(DMAC) as solvent,polysalfone(PSF) as polymer,polyvinylpyrrolidone(PVP) and acetone as additives to prepare spinning dope,the relations between its erupting flux and pressure,viscosity were separately studied;the model of spinning dope erupting flux was then analyzed;the validity of the model was finally verified with afore-made spinning dope.The results show that the relation between erupting flux and its viscosity can be expressed as Q∝μ-1.08;the relation between erupting flux and its pressure can be expressed as Q∝p1.18;for those test-used equipment,the spinning dope flux Q=426 μ-1.08 p1.18 is set up.The verification result shows a broad applicability of the model.The model has an important guiding significance for preparation and study of the hollow fiber membrane.