Fiber-enhanced cellulose triacetate reverse osmosis membrane and preparation method thereof

A technology of cellulose triacetate and reverse osmosis membrane, applied in the direction of reverse osmosis, semipermeable membrane separation, chemical instruments and methods, etc., can solve problems such as hollow fiber membrane flattening, achieve simplified steps, facilitate industrial implementation, and stabilize penetration flux effect

Inactive Publication Date: 2018-09-04
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ordinary hollow fiber membranes are easily crushed during medium and high pressure operation. In order to improve the mechanical strength of hollow fiber membranes, reinforced hollow fiber membranes are often prepared by reinforcing matrix or braided tube reinforcement method.

Method used

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  • Fiber-enhanced cellulose triacetate reverse osmosis membrane and preparation method thereof
  • Fiber-enhanced cellulose triacetate reverse osmosis membrane and preparation method thereof

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preparation example Construction

[0018] The present invention simultaneously provides a kind of preparation method (abbreviation method) of fiber-reinforced cellulose triacetate reverse osmosis membrane, it is characterized in that the method comprises the following steps:

[0019] A, preparation of twisted fiber: adopt ring spinning frame to twist fiber filament into S-twisted yarn or Z-twisted yarn to form fiber bundle channel structure, and use the twisted fiber as the reinforcing layer of reverse osmosis membrane;

[0020] The fiber filament adopts high-temperature-resistant fiber (fiber that can maintain its original physical and mechanical properties at a temperature above 180°C for a long time), specifically poly-m-phenylene isophthalamide fiber, poly-terephthalamide fiber, and poly-terephthalamide fiber. At least one of ethylene glycol formate fiber or polypropylene fiber;

[0021] B, the preparation of film-forming system: blend triacetate cellulose, plasticizer and additive in closed high-speed mixe...

Embodiment 1

[0027] A, the preparation of twisted fiber: adopt the ring spinning frame to twist the polym-phenylene isophthalamide fiber filament into the S-twisted yarn whose thickness is 100 μm;

[0028] B. Preparation of film-forming system: blending cellulose triacetate, sulfolane, ethylene glycol and benzoic acid to obtain a film-forming system; cellulose triacetate accounts for 33wt.% of the mass of the film-forming system, and plasticizer accounts for the mass of the film-forming system % of 47wt.%, the additive accounts for 20wt.% of the mass of the film-forming system; the mass ratio of ethylene glycol to benzoic acid is 11:5;

[0029] C. Preparation of reverse osmosis membrane: The film-forming system is melted and extruded by a screw extruder, and the melt is evenly coated on the outer surface of the S-twisted yarn through a ring spinneret, and then drawn to 30wt.% sulfolane / 5wt .% ethylene glycol / 65wt.% water in a coagulation bath for cooling and molding to obtain a fiber-reinf...

Embodiment 2

[0033] A, the preparation of twisted fiber: adopt the ring spinning frame to twist the polyethylene terephthalate fiber long filament into the Z-twisted yarn that thickness is 200 μ m;

[0034] B. Preparation of film-forming system: blending cellulose triacetate, sulfolane, ethylene glycol and benzoic acid to obtain a film-forming system; cellulose triacetate accounts for 38wt.% of the mass of the film-forming system, and plasticizer accounts for the mass of the film-forming system % of 45wt.%, the additive accounts for 17wt.% of the mass of the film-forming system; the mass ratio of ethylene glycol to benzoic acid is 11:5;

[0035] C. Preparation of reverse osmosis membrane: Melt and extrude the film-forming system through a screw extruder and evenly coat the melt on the outer surface of the Z-twisted yarn through an annular spinneret, and then draw it to 30wt.% sulfolane / 5wt .% ethylene glycol / 65wt.% water in a coagulation bath for cooling and molding to obtain a fiber-reinf...

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Abstract

The invention discloses a fiber-enhanced cellulose triacetate reverse osmosis membrane and a preparation method thereof. The reverse osmosis membrane comprises a cellulose triacetate separating layeron an outer layer and an S-twist yarn or Z-twist yarn enhancing layer on an inner layer. The thickness of the cellulose triacetate separating layer is 20-200 microns, and the thickness of the S-twistyarn or Z-twist yarn enhancing layer is 100-500 microns. A permeation flux of the reverse osmosis membrane is 10-100 Lm<-2>h<-1>MPa, and a salt removing rate is 90-99%. The method comprises the following steps: A, preparing twisting fibers: twisting a fiber filament to be an S-twist yarn or a Z-twist yarn; B, preparing a membrane forming system: blending cellulose triacetate, a plasticizer and anadditive to obtain the membrane forming system; and C, preparing the reverse osmosis membrane: extruding the membrane forming system through a screw extruder and uniformly coating the outer surface ofthe S-twist yarn or the Z-twist yarn by melt through an annular spinning nozzle, and drafting to a coagulating bath for cooling and forming, to obtain the fiber-enhanced cellulose triacetate reverseosmosis membrane.

Description

technical field [0001] The invention relates to the technical field of hollow fiber membranes, in particular to a fiber-reinforced cellulose triacetate reverse osmosis membrane and a preparation method thereof. Background technique [0002] High-salt wastewater can produce a large osmotic pressure difference at the interface with pure water. When it seeps into the soil system, it will cause soil organisms and plants to die due to dehydration, resulting in the collapse of the soil ecosystem. At present, with the development of industry and the shortage of water resources, the pollution concentration of high-salt wastewater produced by some industries is getting higher and higher, the composition is more and more complex, the discharge volume is increasing, and the environmental pressure brought about is also increasing. bigger and bigger. Therefore, the research on high-salt industrial wastewater treatment technology is imminent, and the exploration of effective high-salt wa...

Claims

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Application Information

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IPC IPC(8): B01D61/02B01D67/00B01D69/02B01D71/16C02F1/44
CPCB01D61/025B01D67/0002B01D69/02B01D71/16B01D2325/24C02F1/441
Inventor 肖长发陈凯凯储智勇黄阳正刘海亮张泰
Owner TIANJIN POLYTECHNIC UNIV
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