Method for preparing nano silver mixed with natural cellulose fiber
A natural cellulose and nano-silver technology, applied in the direction of artificial filaments made of viscose, can solve the problems of environmental impact, different antibacterial effects of nano-silver chemical fibers, and the inability to meet the precise requirements of the end-of-use.
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Embodiment 1
[0034] Add 5.0g of partially alkalized polyvinyl alcohol into 95.0g of pure water, and keep stirring for 2 hours to obtain a 5wt% polyvinyl alcohol solution. Dissolve an appropriate amount of silver nitrate crystals in pure water to prepare a 0.1N silver nitrate solution 0.5ml, and add it to the polyvinyl alcohol gel solution and stir evenly, then carry out reduction titration with 0.2N sodium borohydride at a rate of 5ml per minute to obtain 1000ppm nano-silver sol, and the polyvinyl alcohol gel will It turns translucent and gradually turns yellow to yellowish brown, and when it reaches the titration end point, it should be brown or even dark brown.
[0035] The nano-silver sol sample obtained above is carried out particle size distribution, such as Figure 5 shown. And after diluting the sample 100 times, carry out electron microscope (TEM) image verification, such as Figure 6 shown.
[0036] Depend on Figure 5 According to the results of medium particle size analysis,...
Embodiment 2
[0038] Mix wood pulp with a degree of polymerization of 650 and oxidized methyl marin solvent to form cellulose slurry, and then add 5-35 wt% nano-silver sol for blending; the concentration of nano-silver particles is 100-5000ppm, and vacuum film evaporation Evaporate excess water, heat at 80°C to 130°C, remove water to 5% to 13% within 5 minutes, and then dissolve cellulose into spinning dope. The composition of spinning dope is shown in [Table 1] ], and then the spinning dope is spun by the dry-jet wet spinning method (Dry-Jet Wet Spinning), filtered by a continuous filter (CPF), degassed, and then enters the spinning box. It is extruded to form a thin stream of melt, which is stretched and thinned into tows through an air gap, and then regenerated in a coagulation bath, washed with water to dissolve, and then dried, oiled and coiled to obtain antibacterial properties. The nano-silver natural cellulose fibers obtained above are shown in sample numbers 1 to 11 in [Table 1]. ...
Embodiment 3
[0040] Mix wood pulp with a degree of polymerization of 1050 and oxidized methyl marin solvent to form cellulose slurry, and then add 5 to 35 wt% nano-silver sol for blending; wherein the concentration of nano-silver particles is 100-5000ppm, and vacuum film The evaporator evaporates the excess water, heats at 80°C to 130°C, removes the water to 5% to 13% within 5 minutes, and then dissolves the cellulose into spinning dope. The composition of spinning dope is shown in [Table As shown in one], the spinning viscose is spun by dry-jet wet spinning (Dry-Jet Wet Spinning), filtered by a continuous filter (CPF) and degassed, then enters the spinning box, and is spun by the spinning box. It is extruded to form a thin stream of melt, which is extended and thinned into tow through an air gap, and then regenerated in a coagulation bath, washed with water to dissolve, and then dried, oiled and coiled to obtain antibacterial Functional nano-silver natural cellulose fibers, the fiber samp...
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