Forming process of hollow fiber membrane
A molding process, fiber membrane technology, applied in the field of hollow fiber membrane molding technology, can solve the problems of high cleaning frequency, high operating pressure, difficult cleaning, etc., achieve good dispersion performance, reduce operating pressure, pollution resistance and strength improvement Effect
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Embodiment 1
[0021] A hollow fiber membrane molding process is provided in the embodiment of the present invention. The specific steps are as follows: dissolve 3.5g polyvinyl chloride resin in 28g N,N-dimethylacetamide, successively 0.075g vinyl acetate, 0.65g Nano alumina (Al2O3) powder and 0.6g nano calcium carbonate (CaCO3), the dispersant sodium hexametaphosphate of 0.5g and the additive polyvinylpyrrolidone (PVP) of 2.0g, and under the temperature control of 60 ℃, uniformly stirred for 15 hours, The nanoparticles are evenly dispersed in the solution, sealed and left to stand for 2 days for degassing, and the temperature is kept at 70°C required for spinning. Spinning under the pressure of 0.2MPa, the PVC casting liquid passes through the spinneret at an extrusion speed of 1ml / min and goes through a 10cm dry spinning process, and then directly passes through a pure water coagulation bath at 55°C to undergo phase inversion The nascent polyvinyl chloride hollow fiber membrane is formed, ...
Embodiment 2
[0023] A hollow fiber membrane molding process is provided in the embodiment of the present invention, and its specific steps are as follows the same as the above-mentioned embodiment 1, but the embodiment of the present invention is to change the input amount of nano-scale alumina and calcium carbonate from the total amount of casting liquid The reduction of 1.5% to 1.00% results in a hollow fiber membrane with an inner diameter of 0.2mm and a rejection rate of 98.10% for particles with an average particle diameter of 0.15um.
Embodiment 3
[0025] The embodiment of the present invention provides a hollow fiber membrane molding process, the specific steps are the same as the above-mentioned embodiment 1, but the embodiment of the present invention is to increase the dry spinning length of 10cm to 15cm, to obtain the inner diameter of the hollow fiber membrane It is 0.25mm, and the rejection rate of particles with an average particle size of 0.15um is 98.12%.
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