A kind of preparation method of poly-γ-glutamic acid/chitosan/nano-silver antibacterial composite fiber
A nano-silver antibacterial and composite fiber technology, applied in the direction of conductive/antistatic filament manufacturing, fiber chemical characteristics, conjugated synthetic polymer artificial filament, etc., to achieve the effects of reducing production costs, convenient use, and stable structure
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Embodiment 1
[0031] (1) Add the poly-γ-glutamic acid solution dropwise to the chitosan spinning solution, and use the electrostatic interaction between the carboxyl group of poly-γ-glutamic acid (γ-PGA) and the amino group of chitosan (CS) The nanoparticles were prepared according to the ratio of the amount of carboxyl group to amino group: under stirring at room temperature (600 r / min), 10 mL, 2 g / L of γ-PGA was injected with a micro syringe pump at a rate of 6 mL / h. The rate was added dropwise to 5% CS acetate buffer solution (50 mL, pH=6, the volume fraction of acetic acid solution was 2%, and the weight-average molecular weight of chitosan was 6×10). 5 g / mol, the degree of deacetylation is greater than 90%), while stirring and ultrasonicating for 10 minutes, and dialysis for 3 hours to remove unbound small molecular polymers;
[0032] (2) Measure 8ml of 0.1mol / L silver nitrate solution, weigh 0.8g of PVP and dissolve it in the silver nitrate solution. Light yellow, put it on a magnet...
Embodiment 2
[0036] (1) Add the poly-γ-glutamic acid solution dropwise to the chitosan spinning solution, and use the electrostatic interaction between the carboxyl group of poly-γ-glutamic acid (γ-PGA) and the amino group of chitosan (CS) The nanoparticles were prepared according to the ratio of the amount of the carboxyl group to the amino group. Under stirring at room temperature (600 r / min), 10 mL and 2 g / L of γ-PGA were added dropwise to 4% CS acetate buffer (50 mL / h) with a micro syringe pump at a rate of 6 mL / h. mL, pH=6, the volume fraction of acetic acid solution is 2%, and the weight-average molecular weight of chitosan is 6×10 5 g / mol, the degree of deacetylation is greater than 90%), while stirring and ultrasonicating for 10min, dialyzed for 3h to remove unbound small polymer;
[0037] (2) Measure 7ml of 0.1mol / L silver nitrate solution, weigh 0.9g of PVP and dissolve it in silver nitrate solution. Light yellow, put it on a magnetic stirrer, adjust the appropriate rotation s...
Embodiment 3
[0041] (1) Add the poly-γ-glutamic acid solution dropwise to the chitosan spinning solution, and use the electrostatic interaction between the carboxyl group of poly-γ-glutamic acid (γ-PGA) and the amino group of chitosan (CS) The nanoparticles were prepared according to the ratio of the amount of the carboxyl group to the amino group. The mass fraction of chitosan in the chitosan spinning solution is 5%, and the solvent is an acetic acid solution with a volume fraction of 2%; the weight-average molecular weight of the chitosan is 6×10 5 g / mol, the degree of deacetylation is greater than 90%. Under stirring at room temperature (600 r / min), 10 mL and 2 g / L of γ-PGA were added dropwise to CS acetate buffer (50 mL, pH=6) at a rate of 6 mL / h using a micro syringe pump. , while stirring and sonicating for 10min, and dialyzing for 1-3h to remove unbound small-molecule polymers.
[0042] (2) Measure 9ml of 0.1mol / L silver nitrate solution, weigh 0.6g of PVP and dissolve it in the s...
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