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
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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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