Process for preparing chitosan nano fiber film with stable state

Abstract

the invention discloses a chitose nanometer fiber film and preparing method with stable shape structure in the carrier domain, which comprises the following steps: forming transparent solution in the water mixed solvent through dissolving chitose and polyvinyl alcohol in the glacial acetic acid; putting the spin liquid in the feeder; connecting spin-spraying head with high-pressure power at 5-30 kV; spinning; immersing the film material in the strong alkaline solution; possessing stable shape structure.

Description

technical field

[0001] The invention relates to a preparation technology of a chitosan nanofiber membrane with a stable morphological structure. Background technique

[0002] The use of electrospinning to prepare nano-sized fiber composite membrane materials has attracted more and more attention. Electrospinning technology is to spin a polymer solution or melt under an electric field, stretch it due to electrostatic action, and obtain ultra-fine nanofibers after cooling or solvent volatilization. This type of material has the advantages of high specific surface area and high porosity. . The electrospinning method can be used to prepare various polymer nanofiber composite membrane materials. US 20030215624; 20040013873 common polymers such as: polyvinyl alcohol, polyethylene, polypropylene, polystyrene, polysulfone, polycarbonate, polyurethane, polymethacrylate, polyvinyl chloride, polyamide by electrospinning , polyacrylate, polyvinylpyrrolidone, etc. to prepare superfine...

Examples

Embodiment 1

[0015] Be that 5% chitosan (viscosity-average molecular weight is 100,000) is dissolved in 90% acetic acid aqueous solution by weight percent, mechanically stirs at normal temperature, after dissolving completely, form homogeneous, transparent, viscous solution; 9% polyvinyl alcohol (the degree of polymerization is 1700, and the degree of alcoholysis is 88%) is dissolved in water to form a homogeneous, transparent, viscous solution; Mix evenly to get the spinning solution, add it to the injector, connect it to the spinneret, connect the spinneret to the high-voltage power supply, the distance between the spinneret and the acceptor is about 10 cm, and the spinneret spinning solution The flow rate is 0.3 ml / hour, the voltage is 20 kV, electrospinning is performed, and a chitosan / polyvinyl alcohol nanofiber composite membrane with a diameter of 50-200 nanometers is obtained. Then immerse the obtained nanofiber composite membrane in 0.5 mol / liter sodium carbonate solution, soak it...

Embodiment 2

[0017] The chitosan (viscosity-average molecular weight is 200,000) that is 4% by weight percentage is dissolved in 90% acetic acid aqueous solution, mechanically stirred at normal temperature, after dissolving completely, form homogeneous, transparent, viscous solution; 9% polyvinyl alcohol (polymerization degree is 2400~2500, alcoholysis degree is 99%) is dissolved in water, forms homogeneous, transparent, viscous solution; : 1 mix evenly to obtain the spinning solution, add it to the sample injector, connect to the spinneret, connect the spinneret to the high voltage power supply, the distance between the spinneret and the acceptor is about 10 cm, and the spinneret spins The flow rate of the silk liquid is 0.5 ml / hour, the voltage is 20 kV, electrospinning is carried out, and a chitosan / polyvinyl alcohol nanofiber composite membrane with a diameter of 100-300 nanometers is obtained. Then immerse the obtained nanofiber composite membrane in 0.5 mol / liter sodium hydroxide sol...

Embodiment 3

[0019] The chitosan (viscosity-average molecular weight is 500,000) that is 3% by weight percent is dissolved in 90% acetic acid aqueous solution, mechanically stirred at normal temperature, after dissolving completely, form homogeneous, transparent, viscous solution; 10% polyvinyl alcohol (polymerization degree is 1700, alcoholysis degree is 88%) is dissolved in water, forms homogeneous, transparent, viscous solution; Mix evenly to get the spinning solution, add it to the injector, connect to the spinneret, connect the spinneret to the high-voltage power supply, the distance between the spinneret and the acceptor is about 15 cm, and the spinneret spinning solution The flow rate is 1.0 ml / hour, the voltage is 20 kV, electrospinning is carried out, and a chitosan / polyvinyl alcohol nanofiber composite membrane with a diameter of 400-800 nanometers is obtained. Then immerse the obtained nanofiber composite membrane in 1 mol / liter of potassium carbonate solution, soak it at room t...

technical field

[0001] The invention relates to a preparation technology of a chitosan nanofiber membrane with a stable morphological structure. Background technique

[0002] The use of electrospinning to prepare nano-sized fiber composite membrane materials has attracted more and more attention. Electrospinning technology is to spin a polymer solution or melt under an electric field, stretch it due to electrostatic action, and obtain ultra-fine nanofibers after cooling or solvent volatilization. This type of material has the advantages of high specific surface area and high porosity. . The electrospinning method can be used to prepare various polymer nanofiber composite membrane materials. US 20030215624; 20040013873 common polymers such as: polyvinyl alcohol, polyethylene, polypropylene, polystyrene, polysulfone, polycarbonate, polyurethane, polymethacrylate, polyvinyl chloride, polyamide by electrospinning , polyacrylate, polyvinylpyrrolidone, etc. to prepare superfine...

Examples

Embodiment 1

[0015] Be that 5% chitosan (viscosity-average molecular weight is 100,000) is dissolved in 90% acetic acid aqueous solution by weight percent, mechanically stirs at normal temperature, after dissolving completely, form homogeneous, transparent, viscous solution; 9% polyvinyl alcohol (the degree of polymerization is 1700, and the degree of alcoholysis is 88%) is dissolved in water to form a homogeneous, transparent, viscous solution; Mix evenly to get the spinning solution, add it to the injector, connect it to the spinneret, connect the spinneret to the high-voltage power supply, the distance between the spinneret and the acceptor is about 10 cm, and the spinneret spinning solution The flow rate is 0.3 ml / hour, the voltage is 20 kV, electrospinning is performed, and a chitosan / polyvinyl alcohol nanofiber composite membrane with a diameter of 50-200 nanometers is obtained. Then immerse the obtained nanofiber composite membrane in 0.5 mol / liter sodium carbonate solution, soak it...

Embodiment 2

[0017] The chitosan (viscosity-average molecular weight is 200,000) that is 4% by weight percentage is dissolved in 90% acetic acid aqueous solution, mechanically stirred at normal temperature, after dissolving completely, form homogeneous, transparent, viscous solution; 9% polyvinyl alcohol (polymerization degree is 2400~2500, alcoholysis degree is 99%) is dissolved in water, forms homogeneous, transparent, viscous solution; : 1 mix evenly to obtain the spinning solution, add it to the sample injector, connect to the spinneret, connect the spinneret to the high voltage power supply, the distance between the spinneret and the acceptor is about 10 cm, and the spinneret spins The flow rate of the silk liquid is 0.5 ml / hour, the voltage is 20 kV, electrospinning is carried out, and a chitosan / polyvinyl alcohol nanofiber composite membrane with a diameter of 100-300 nanometers is obtained. Then immerse the obtained nanofiber composite membrane in 0.5 mol / liter sodium hydroxide sol...

Embodiment 3

[0019] The chitosan (viscosity-average molecular weight is 500,000) that is 3% by weight percent is dissolved in 90% acetic acid aqueous solution, mechanically stirred at normal temperature, after dissolving completely, form homogeneous, transparent, viscous solution; 10% polyvinyl alcohol (polymerization degree is 1700, alcoholysis degree is 88%) is dissolved in water, forms homogeneous, transparent, viscous solution; Mix evenly to get the spinning solution, add it to the injector, connect to the spinneret, connect the spinneret to the high-voltage power supply, the distance between the spinneret and the acceptor is about 15 cm, and the spinneret spinning solution The flow rate is 1.0 ml / hour, the voltage is 20 kV, electrospinning is carried out, and a chitosan / polyvinyl alcohol nanofiber composite membrane with a diameter of 400-800 nanometers is obtained. Then immerse the obtained nanofiber composite membrane in 1 mol / liter of potassium carbonate solution, soak it at room t...