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Preparation method for three-dimensional-network-shaped gradient composite functional film, and product thereof

A composite function and three-dimensional network technology, which is applied in the field of functionalized preparation of nanofiber composite materials, can solve the problems such as the inability to utilize the large specific surface area of ​​the nanofiber membrane and the large size of cellulose, and achieves increased porosity, low cost, and increased ratio. The effect of surface area

Active Publication Date: 2016-10-12
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the coated cellulose has a large size, and a thicker layer is applied on the nanofibrous membrane with a spatula, and the large specific surface area of ​​the nanofibrous membrane with a three-dimensional network structure cannot be utilized. The cellulose flat membrane as the substrate can only improve the hydrophilicity and filtration performance of the nanofiber membrane

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A method for preparing a gradient composite functional membrane based on a three-dimensional network, spraying a suspension of nano-microcrystalline cellulose with a concentration of 0.01wt% on the surface of a PVA-co-PE nanofiber membrane with a thickness of 1 μm, wherein the pH of the suspension is 8, the length of nano-microcrystalline cellulose in the suspension is 1nm, the diameter is 0.5nm, and the spraying amount is 0.01g / m 2;The process parameters of spraying are: spraying width is 50mm, air pressure is 0.1MPa, flow rate is 1mL / min, and spraying height is 10cm; then it is dried and formed at 10°C to form nano-microcrystalline cellulose dispersed in nanofibers in different directions A gradient composite functional film on the surface of the substrate and the superficial layer of the nanofiber substrate; tests show that the change rate of the contact angle of the prepared nanofiber substrate is 50%, the change rate of the pore size is 30%, and the change rate of t...

Embodiment 2

[0033] A method for preparing a gradient composite functional membrane based on a three-dimensional network, spraying a concentration of 4wt% nanocrystalline cellulose suspension on the surface of a PE-co-GMA nanofiber membrane with a thickness of 500 μm, wherein the pH of the suspension is 12. The length of nano-microcrystalline cellulose in the suspension is 200nm, the diameter is 20nm, and the spraying amount is 0.5g / m 2 ;The process parameters of spraying are: spraying width is 150mm, air pressure is 0.5MPa, flow rate is 5mL / min, and spraying height is 50cm; then it is dried and formed at 50°C to form nano-microcrystalline cellulose dispersed in nanofibers in different directions A gradient composite functional film on the surface of the substrate and the superficial layer of the nanofiber substrate; tests show that the prepared contact angle change rate is 80%, the pore size change rate is 200%, and the strength change rate is 50%.

[0034] The preparation method of the d...

Embodiment 3

[0036] A method for preparing a gradient composite functional membrane based on a three-dimensional network, spraying a suspension of 1 wt% nanocrystalline cellulose on the surface of a PTT nanofiber membrane with a thickness of 100 μm, wherein the pH of the suspension is 9, and the suspension is The length of nano-microcrystalline cellulose is 50nm, the diameter is 2nm, and the spraying amount is 0.1g / m 2 ;The process parameters of spraying are: spraying width is 100mm, air pressure is 0.29MPa, flow rate is 2mL / min, and spraying height is 15cm; then it is dried and formed at 20°C to form nano-microcrystalline cellulose dispersed in nanofibers in different directions Gradient composite functional film on the surface of the substrate and the superficial layer of the nanofiber substrate; tests show that the change rate of the contact angle of the prepared nanofiber substrate is 60%, the change rate of the pore size is 50%, and the change rate of the strength is 20%.

[0037] The...

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Abstract

The invention relates to a preparation method for a three-dimensional-network-shaped gradient composite functional film, and a product thereof. The preparation method comprises the following steps: spraying a nanometer microcrystalline cellulose suspension onto the surface of a nanofiber substrate, and carrying out drying and molding so as to form the gradient composite functional film. The prepared gradient composite functional film has a great specific surface area, a small pore size, high porosity and a large number of reaction bits. A heavy metal ion adsorption material prepared by subjecting the film and polybasic carboxylic acid to surface grafting has a heavy metal ion adsorption rate of no less than 99%; and the disadvantages of complex process, high cost and proneness to secondary pollution of common metal ion chelating agent processes are overcome. An organic matter degrading material prepared by subjecting the film and a photocatalyst to surface grafting has an organic matter removal rate of no less than 99% and has an antibiosis rate of 99.9999% after ultraviolet irradiation for 10 min.

Description

technical field [0001] The invention belongs to the technical field of functional preparation of nanofiber composite materials, and relates to a preparation method of a gradient composite functional film based on a three-dimensional network and its products, in particular to a gradient composite function based on a three-dimensional network of nanofibers and nanocrystalline cellulose Membranes and methods for their preparation. Background technique [0002] Nanofiber is a kind of ultrafine fiber, which has the characteristics of large specific surface area, large aspect ratio and easy film formation. It is widely used in the fields of medicine, food, industry and household, especially as a filter material for air and water treatment. [0003] Wang Dong, Sun Gang and others from the University of California, Davis, used the melt extrusion phase separation method to melt and extrude the thermoplastic polyolefin / CAB (cellulose acetate butyrate) blend system to prepare polyolefi...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D67/00B01J31/04B01J20/26B01J20/28C02F1/28C02F1/62
CPCB01D67/0002B01D69/12C02F1/288B01J20/26B01J20/28033B01J31/04B01J35/39
Inventor 王栋朱青王遥阎克路李沐芳胡春艳
Owner DONGHUA UNIV
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