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Cellulose acetate filter membrane and preparation method thereof

A technology of cellulose acetate and filter membrane, which is applied in the field of filter membrane, which can solve the problems of affecting the enhancement effect, agglomeration, and inability to directly and evenly disperse, so as to achieve the effects of improving filtration performance, reducing adsorption, and broadening the scope of industrial applications

Pending Publication Date: 2021-08-10
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, CNCs cannot be directly and uniformly dispersed in the CA matrix, and the unevenly dispersed nanoparticles are likely to cause agglomeration between nanoparticles due to the high surface area, which affects its reinforcing effect.

Method used

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  • Cellulose acetate filter membrane and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Weigh 3 g of CNCs and add it into 300 mL of deionized water, and treat it with an ultrasonic device with a power of 200 W for 30 min to obtain an aqueous dispersion of CNCs. Ammonia water was added dropwise to adjust the pH value of the aqueous dispersion of CNCs to 8.5, then 0.15 g DA (accounting for 5 wt% of the dry weight of CNCs) was added, and the reaction was stirred at room temperature for 12 h. Finally, dilute acid solution was added to stop the reaction, vacuum filtration and thorough washing were performed, and the obtained brown product was polydopamine-coated cellulose nanocrystals (PDA@CNCs). 20gCA and 0.6gPVP were added to 79.4gDMAc, and magnetically stirred at room temperature for 48h. After CA and PVP were completely dissolved, a 20wt% transparent CA solution was obtained. 0.2 g of PDA@CNCs was dispersed in 99.8 g of DMAc to obtain a 0.2 wt% PDA@CNCs dispersion.

[0020] (2) The CA solution and the PDA@CNCs dispersion were mixed at a weight ratio of...

Embodiment 2

[0024] (1) Weigh 3 g of CNCs and add it into 300 mL of deionized water, and treat it with an ultrasonic device with a power of 200 W for 30 min to obtain an aqueous dispersion of CNCs. Ammonia water was added dropwise to adjust the pH value of the CNCs aqueous dispersion to 8.5, then 0.30 g DA (accounting for 10 wt% of the dry weight of CNCs) was added, and the reaction was stirred at room temperature for 12 h. Finally, dilute acid solution was added to stop the reaction, vacuum filtration and thorough washing were performed, and the obtained brown product was polydopamine-coated cellulose nanocrystals (PDA@CNCs). 20gCA and 0.6gPVP were added to 79.4gDMAc, and magnetically stirred at room temperature for 48h. After CA and PVP were completely dissolved, a 20wt% transparent CA solution was obtained. 0.4 g of PDA@CNCs was dispersed in 99.6 g of DMAc to obtain a 0.4 wt% PDA@CNCs dispersion.

[0025] (2) The CA solution and the PDA@CNCs dispersion were mixed at a weight ratio of 1...

Embodiment 3

[0029] (1) Weigh 3 g of CNCs and add it into 300 mL of deionized water, and treat it with an ultrasonic device with a power of 200 W for 30 min to obtain an aqueous dispersion of CNCs. Ammonia water was added dropwise to adjust the pH value of the aqueous dispersion of CNCs to 8.5, then 0.45 g DA (accounting for 15 wt% of the dry weight of CNCs) was added, and the reaction was stirred at room temperature for 12 h. Finally, dilute acid solution was added to stop the reaction, vacuum filtration and thorough washing were performed, and the obtained brown product was polydopamine-coated cellulose nanocrystals (PDA@CNCs). 20gCA and 0.6gPVP were added to 79.4gDMAc, and magnetically stirred at room temperature for 48h. After CA and PVP were completely dissolved, a 20wt% transparent CA solution was obtained. 0.6 g of PDA@CNCs was dispersed in 99.4 g of DMAc to obtain a 0.6 wt% PDA@CNCs dispersion.

[0030] (2) The CA solution and the PDA@CNCs dispersion were mixed at a weight ratio o...

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Abstract

The invention discloses a preparation method of a cellulose acetate filter membrane. The preparation method comprises the following steps: S1, modifying cellulose nanocrystals with dopamine; s2, preparing a cellulose acetate filter membrane: respectively dissolving cellulose acetate and the polydopamine-coated cellulose nanocrystals in DMAc to form a solution and a dispersion liquid so as to obtain a cellulose acetate membrane casting solution, coating a glass plate with the cellulose acetate membrane casting solution, and carrying out phase transfer to form a membrane, and stripping to obtain the polydopamine coated cellulose nanocrystal enhanced cellulose acetate filter membrane. The PDA is coated on the surface of the CNCs, so that the hydrophilicity and lipophilicity of the CNCs are improved, and the dispersity of the CNCs nano material in an organic solvent and the hydrophobic polymer matrix is improved. The PDA-coated CNCs filler is added into the CA filter membrane, so that the interface bonding force between the CNCs filler and a CA matrix is enhanced, the mechanical property and hydrophilicity of the CA membrane are improved, the tensile strength of the CA filter membrane can be remarkably improved by adding a small amount of PDA-coated CNCs, meanwhile, the filtering performance and the anti-pollution capacity of the CA membrane are improved.

Description

technical field [0001] The invention relates to the field of filter membranes, in particular to a cellulose acetate filter membrane and a preparation method thereof. Background technique [0002] Cellulose acetate (CA), as an environmentally friendly material with a wide range of sources and biodegradability, has the advantages of good biocompatibility, non-toxicity, good processability, easy film formation, excellent hydrophilicity, and large flux. , are widely used in biological separation and desalination and treatment of different water bodies. CA filter membranes can be prepared by solution casting and phase inversion methods. However, membranes prepared by the phase inversion method usually have a dense skin layer and a porous sublayer, resulting in low permeability and low solute selectivity. In addition, there are some important disadvantages of CA filter membranes, such as low mechanical strength and narrow working range of temperature (up to 30 °C) and pH. There...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/16B01D71/60B01D69/12B01D69/02B01D67/00
CPCB01D71/16B01D71/60B01D69/125B01D69/02B01D67/0011B01D67/0013
Inventor 张勇周源姚安荣谭淋施亦东
Owner SICHUAN UNIV
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