Preparation method for blending modification of ultrafiltration membrane by using nano cellulose crystal

A nanocellulose, blending modification technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of expensive nanomaterials, poor material dispersibility, insufficient hydrophilicity, etc. Achieve the effect of strong operability, reduction of complex processes and low price

Inactive Publication Date: 2018-11-09
HAINAN LITREE PURIFYING TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims to solve the problems of high price of nanomaterials in the process of blending and modifying ultrafiltration membranes of existing nanomaterials and the problems of poor material dispersion, insufficient hydrophilicity and easy agglomeration in the preparation process, and provides a method using nanocellulose crystals Preparation method of blended modified ultrafiltration membrane

Method used

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  • Preparation method for blending modification of ultrafiltration membrane by using nano cellulose crystal
  • Preparation method for blending modification of ultrafiltration membrane by using nano cellulose crystal
  • Preparation method for blending modification of ultrafiltration membrane by using nano cellulose crystal

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Embodiment 1

[0029] Embodiment 1: In this embodiment, the preparation method of ultrafiltration membrane modified by blending nanocellulose crystals is carried out according to the following steps:

[0030] Step 1, in 250mL conical flask, add 0.5g nanocellulose crystal ( figure 1 , 2 and 3) and 83.5g of N,N-dimethylformamide, ultrasonically dispersed for 30min, added 12g of polysulfone and 4g of PEG200, sealed with plastic wrap, and then placed on a magnetic heating stirrer, at 60 ° C, 400r / After heating and stirring at 1 min for 8 hours, let it stand for degassing at room temperature for 24 hours, and the casting solution after degassing is a homogeneous and transparent colloidal solution, forming a homogeneous casting solution;

[0031] Step 2, then slowly pour the casting solution formed in Step 1 on the glass plate with PET non-woven fabric at a temperature of 25±0.5°C and a humidity of 30%-40%, and adjust the height of the doctor blade to 80 μm , scrape the film evenly on the non-w...

Embodiment 2

[0035] Embodiment 2: In this embodiment, the preparation method of ultrafiltration membrane modified by blending of nanocellulose crystals is carried out according to the following steps:

[0036] Step 1, in 250mL conical flask, add 0.5g nanocellulose crystal ( figure 1 , 2 and 3) and 83.5g N-methylpyrrolidone, ultrasonically disperse for 30min, add 12g polyether ether ketone and 4g PVPk30, seal the bottle mouth with plastic wrap, then place it on a magnetic heating stirrer, and heat it at 60°C and 400r / min After stirring for 8 hours, stand at room temperature for degassing for 24 hours, and the casting solution after degassing is a homogeneous and transparent colloidal solution, forming a homogeneous casting solution;

[0037] Step 2, then slowly pour the casting solution formed in Step 1 on the glass plate with PET non-woven fabric at a temperature of 25±0.5°C and a humidity of 30%-40%, and adjust the height of the doctor blade to 80 μm , scrape the film evenly on the non-wo...

Embodiment 3

[0038] Embodiment 3: In this embodiment, the preparation method of ultrafiltration membrane modified by blending nanocellulose crystals is carried out according to the following steps:

[0039] Step 1, in 250mL conical flask, add 0.5g nanocellulose crystal ( figure 1 , 2 and 3) and 83.5g N, N-dimethylacetamide, ultrasonic dispersion for 30min, add 12g polyethersulfone and 4g ethylene glycol, seal the bottle mouth with plastic wrap, then place it on a magnetic heating stirrer, at 60 ℃, After heating and stirring at 400r / min for 8 hours, let it stand at room temperature for degassing for 24 hours, and the casting solution after degassing is a homogeneous and transparent colloidal solution, forming a homogeneous casting solution;

[0040] Step 2, then slowly pour the casting solution formed in Step 1 on the glass plate with PET non-woven fabric at a temperature of 25±0.5°C and a humidity of 30%-40%, and adjust the height of the doctor blade to 80 μm , scrape the film evenly on ...

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Abstract

The invention discloses a preparation method for blending modification of an ultrafiltration membrane by using nano cellulose crystal, belonging to the field of preparation of membrane materials. Thepreparation method solves the problems that the nano material is expensive in the process of blending modification of ultrafiltration membrane by the existing nano material, and the material dispersibility is not good, the hydrophilicity is insufficient and the material is inclined to agglomerate in the preparation process. The preparation method firstly ultrasonically disperses the nanocellulosecrystals in an organic solvent, then adds the additive and the polymer film material, heats and stirs uniformly, and performs vacuum defoaming to obtain a casting liquid; the casting liquid is evenlyscraped onto the non-woven fabric, and the modified ultrafiltration membrane is obtained by undergoing a coagulation bath. The preparation method makes good use of the hydrophilicity and mechanical strength of the nanocellulose crystal, greatly improves the anti-pollution performance, the water flux and the mechanical strength of the ultrafiltration membrane, and prolongs the service life of the membrane. Simultaneously, the modified nano materials derive from a wealth of sources, and are cheap and easy to obtain, and have good dispersibility in the solvent, so that the ultrafiltration membrane is relatively low in cost and convenient for industrial production.

Description

Background technique [0001] The invention belongs to the field of membrane material preparation, and in particular relates to a method for preparing an ultrafiltration membrane modified by blending nano-cellulose crystals. technical field [0002] Ultrafiltration membrane is the core component of ultrafiltration technology, which plays a key role in the operation effect of ultrafiltration, and the main problems of ultrafiltration technology are mostly related to membrane materials. Membrane fouling is one of the main obstacles hindering the development of ultrafiltration technology. It is mainly caused by the deposition of pollutants in the membrane pores or on the membrane surface, which deteriorates the filtration performance of the membrane and increases the operating cost. Many scholars have conducted a lot of in-depth research on the mechanism of membrane fouling and its control methods, but the problem of hydraulic irreversible fouling in ultrafiltration membrane fouli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D71/30B01D71/34B01D71/42B01D71/52B01D71/68
CPCB01D67/0009B01D67/0011B01D71/30B01D71/34B01D71/42B01D71/52B01D71/68
Inventor 梁恒白朗明朱学武李圭白陈忱陈清陈良刚
Owner HAINAN LITREE PURIFYING TECH CO LTD
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