Pressureless polyethersulfone hollow fiber film with highly-asymmetric spongy structure
An asymmetric and fiber membrane technology, applied in the field of membrane separation, can solve the problems of many steps, short membrane life, and lack of industrial production, and achieve the effects of economical and environmentally friendly operation, simple preparation method, and high production efficiency
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Embodiment 1
[0019] Example 1: In a heatable kettle, pour a mixture of 1000g of γ-butyrolactone and 3100g of ε-caprolactam at 70°C, and dissolve 600g of polyethersulfone and 250g of polyethylene within 3 hours under stirring Pyrrolidone (PVP, K90) is made into a transparent, uniform and stable casting liquid, which is sent to the forming spinneret after standing for defoaming, and extruded by the forming spinneret through the annular gap of the spinneret at 20g / min At the same time, nitrogen as an inner diameter maintaining agent is sprayed through the central tube of the spinneret at a pressure of 500 Pa to obtain a hollow fiber. The hollow fiber passes through an air gap of 30 mm in length within 5 seconds of leaving the spinneret head, and then immersed in a 70° C. Coagulate and form in a water bath, and the nascent membrane is pulled and wound in a precipitation water bath at a speed of 80-100m / min to obtain a polyethersulfone hollow fiber membrane. The above hollow fiber membrane is fu...
Embodiment 2
[0021] Example 2: In a heatable kettle, pour a mixture of 250g of ethylene glycol and 3750g of N-methylpyrrolidone at 70°C, and dissolve 700g of polyethersulfone and 300g of polyvinylpyrrolidone within 3 hours under stirring (PVP, K30), made into a transparent, uniform and stable casting solution, which is sent to the forming spinneret after standing for defoaming, and extruded by the forming spinneret through the annular gap of the spinneret at 25g / min. At the same time, nitrogen as an inner diameter maintaining agent is sprayed through the central tube of the spinneret at a pressure of 500 Pa to produce a hollow fiber. The hollow fiber passes through an air gap of 50 mm in length within 5 seconds of leaving the spinneret head, and then immersed in a water bath at 70 ° C. Solidify and form in medium, the nascent membrane is dragged and wound in a precipitation water bath at a speed of 80-100m / min to obtain a polyethersulfone hollow fiber membrane, and the above hollow fiber me...
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