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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

Inactive Publication Date: 2017-04-26
广东嘉逸实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the deficiencies of the prior art, the object of the present invention is to provide a hollow fiber membrane molding process, the hollow fiber membrane prepared by the process overcomes the existing polyvinyl chloride hollow fiber membranes that are easily contaminated by organic matter such as colloid, oil, protein, etc. Pollution, difficult cleaning, high cleaning frequency, high operating pressure and other problems, and the hollow fiber membrane prepared by the present invention has high water flux, strong pollution resistance and high strength

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention discloses a forming process of a hollow fiber membrane. The process includes the following steps that polyvinyl chloride resin is dissolved in a polar solvent, vinyl acetate, a dispersant and additives are added in sequence, stirring is conducted for dissolution for 15-20 h till nanoscale aluminum oxide and calcium carbonate particles are dispersed in the solution to form a uniform polyvinyl chloride casting membrane solution, and the obtained polyvinyl chloride casting membrane solution is defoamed; the prepared polyvinyl chloride casting membrane solution is put into a spinning kettle, the polyvinyl chloride casting membrane solution passes through an air layer through a spinning jet and then enters a coagulating bath for coagulating forming, and a nascent polyvinyl chloride hollow fiber membrane is obtained; the nascent polyvinyl chloride hollow fiber membrane is washed in flowing pure water; the washed nascent polyvinyl chloride hollow fiber membrane is spin-dried through a centrifugal device and then soaked in a mixed solution containing glycerol; finally, the nascent polyvinyl chloride hollow fiber membrane is spin-dried through the centrifugal device to remove part of mixture, taken out of the centrifugal device and then dried through a drying oven. The hollow fiber membrane is high in water flux, high in anti-fouling performance and high in strength, and the interception rate on particles with the average particle size of 0.15 micrometer is 98% or above.

Description

technical field [0001] The invention relates to the field of polymer material molding, in particular to a molding process of hollow fiber membranes. Background technique [0002] Polyvinyl chloride (PVC) is the earliest industrialized general-purpose plastic with the second largest output. It has excellent chemical stability, radiation resistance, mechanical strength, heat resistance and acid and alkali resistance. The most notable advantages of PVC are The price is lower than the above materials (about one-seventh of PVDF), the research in our country is relatively mature, and the variety is wide, which makes it have the potential to reduce the cost of the membrane first. However, PVC film also has disadvantages that cannot be ignored. The surface energy of PVC film is low, resulting in poor hydrophilicity of the film, which reduces the water flux of the film, and the thermal stability of PVC film is not good, resulting in deterioration of processing performance. Hard and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/08B01D71/30B01D67/00
CPCB01D69/08B01D67/0079B01D71/30
Inventor 杨成祥
Owner 广东嘉逸实业有限公司
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