Heterogeneous in-situ fiber-forming reinforced cellulose acetate hollow fiber membrane and preparation method thereof

A cellulose acetate, in-situ fiber-forming technology, applied in the field of film material manufacturing, can solve problems such as low production efficiency, high cost, interlayer peeling, etc., achieve high film production efficiency, improve mechanical properties, and avoid interlayer peeling. Effect

Active Publication Date: 2017-11-07
GUIZHOU MATERIAL IND TECH INSTITUE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a heterogeneous in-situ fiber-forming reinforced cellulose acetate hollow membrane in order to solve the problems of easy-to-produce interlayer peeling, low production efficiency and high cost in the membrane-making process. Preparation method of fiber membrane

Method used

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  • Heterogeneous in-situ fiber-forming reinforced cellulose acetate hollow fiber membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Preparation of casting solution: 120°C, N 2 Under air protection, 21 wt% cellulose acetate (40% acetyl content, molecular weight 30000), 9 wt% polyvinylidene fluoride, 3 wt% PEG400, 67 wt% N-methyl-2 - Pyrrolidone etc. were placed in the reaction kettle and stirred for 4 hours, vacuum degassed for 3 hours to obtain the casting solution;

[0030] (2) Preparation of hollow fiber membrane: Under the pressure of 0.4 MPa, the casting solution prepared in step (1) is extruded into a twin-screw extruder, and the casting solution is further extruded and compacted by the extruder After the action, it is sprayed out through a circular spinneret at 120°C, and then under the traction of the wire guide roller at a traction speed of 50 m / min, it is solidified and formed through an air gap of 10 cm and a pure water coagulation bath at 25°C, that is, Nascent cellulose acetate hollow fiber membranes can be obtained;

[0031] (3) Removal of diluent and porogen: extract the nascent ...

Embodiment 2

[0035] (1) Preparation of casting solution: 110°C, N 2 Under air protection, 25 wt% cellulose acetate (42% acetyl content, molecular weight 50000), 5 wt% ethylene-vinyl alcohol copolymer (27% ethylene content), 1 wt% PEG600, 57 wt% Triethyl citrate, 12 wt% 1,4-butanediol, etc. were placed in a reaction kettle and stirred for 6 hours, and vacuum degassed for 4 hours to obtain a casting solution;

[0036] (2) Preparation of hollow fiber membrane: Under the pressure of 0.4 MPa, the casting solution prepared in step (1) is extruded into a twin-screw extruder, and the casting solution is further extruded and compacted by the extruder After the action, it is sprayed out through a circular spinneret at 110°C, and then under the traction of the wire guide roller at a pulling speed of 60 m / min, it is solidified and formed through an air gap of 8 cm and a pure water coagulation bath at 25°C, that is, Nascent cellulose acetate hollow fiber membranes can be obtained;

[0037] (3) Remova...

Embodiment 3

[0041] (1) Preparation of casting solution: 115°C, N 2 Under air protection, 24 wt% cellulose acetate (40% acetyl content, molecular weight 30000), 6 wt% polyethersulfone, 2 wt% CaCl 2 , 68 wt% N, N-dimethylacetamide, etc. were placed in a reactor and stirred for 4.5 hours, and vacuum degassed for 4 hours to obtain a casting solution;

[0042] (2) Preparation of hollow fiber membrane: Under the pressure of 0.4 MPa, the casting solution prepared in step (1) is extruded into a twin-screw extruder, and the casting solution is further extruded and compacted by the extruder After the action, it is sprayed out through a circular spinneret at 115°C, and then pulled by a wire guide roller at a pulling speed of 70 m / min, through an air gap of 5 cm and 35°C containing 5 wt% N, N- The aqueous coagulation bath of dimethylacetamide is solidified and formed, and the nascent cellulose acetate hollow fiber membrane can be obtained;

[0043] (3) Removal of diluent and porogen: extract the na...

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Abstract

The invention discloses a heterogeneous in situ fiber forming reinforcing cellulose acetate hollow fibrous membrane. The hollow fibrous membrane is characterized by being prepared from, by mass, 14-30% of cellulose acetate, 2-10% of fiber forming polymers, 60-80% of diluent and 0.5-4% of pore-foaming agents, wherein the sum of all constituents is 100%. A preparation method of the reinforcing type hollow fibrous membrane comprises the steps of dissolving the cellulose acetate, the fiber forming polymers, the diluent and the pore-foaming agents, obtaining homogeneous membrane casting liquid, conducting vacuum deformation, further compacting the mixture through a double-screw extruder, jetting out the mixture through an annular spinning nozzle, then under the traction of a wire winding guide roller, immersing the mixture into a coagulation bath for conducting solidification and formation, obtaining a protogenous hollow fibrous membrane, then placing the protogenous hollow fibrous membrane into an extraction agent, extracting the diluent and the pore-foaming agents, conducting heat treatment, and obtaining the cellulose acetate hollow fibrous micro-filtration membrane. According to the heterogeneous in situ fiber forming reinforcing cellulose acetate hollow fibrous membrane and the preparation method thereof, no coating operation is needed in the preparation process, the process is simple, the membrane manufacturing efficiency is high, the cost is low, and the hollow fibrous membrane and the preparation method thereof are suitable for large-scale production.

Description

technical field [0001] The invention belongs to the field of membrane material manufacturing, in particular to a heterogeneous in-situ fiber-forming reinforced cellulose acetate hollow fiber membrane and a preparation method thereof. Background technique [0002] Cellulose acetate (CA) has the characteristics of renewable, degradable, good biocompatibility, easy film formation, good hydrophilicity, etc., and has a wide range of sources and low price. It is the most commonly used environmentally friendly membrane material. Hollow fiber microfiltration membranes, ultrafiltration membranes, nanofiltration membranes, and reverse osmosis membranes prepared from cellulose acetate have been widely used in tap water purification, sewage treatment, hard water softening, brackish water desalination, and seawater desalination. [0003] In recent years, the submerged membrane bioreactor (MBR) with hollow fiber curtain membrane as the core has been widely used in municipal engineering wa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/16B01D69/08B01D67/00
Inventor 谢高艺苏相樵秦舒浩徐国敏张凯舟张敏敏杨敬葵邵会菊姚勇靳进波
Owner GUIZHOU MATERIAL IND TECH INSTITUE
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