Method for preparing nano-silver blended natural cellulose spun-bonded non-woven fabric
A natural cellulose and cellulose technology, applied in non-woven fabrics, textiles, papermaking, fiber chemical characteristics, etc., can solve the problems of environmental impact, inability to meet the precise requirements of the end of use, and varying degrees of antibacterial efficacy
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Embodiment 1
[0035] 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 Add 0.5ml into 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. During the reduction process, the polyvinyl alcohol gel It will gradually turn translucent to yellow and then to yellowish brown, and it should be light brown when it reaches the titration end point.
[0036] 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.
[0037] Depend on Figure 5 According to the results of quantitative analysis, ...
Embodiment 2
[0039] Mix wood pulp with a degree of polymerization of 650 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, vacuum Thin film evaporator evaporates excess water, heats at 80°C~130°C, removes water to 9%~13% within 5 minutes, and then dissolves cellulose into spinning dope (dope). The composition of spinning dope is shown in [ As shown in Table 1, the viscose is pumped into the spinning box by means of spunbond (spunbond) and pumped by a metering pump, and stretched outward through the spinning port by airgap cooling to form long cellulose filaments Then enter the coagulation liquid for coagulation regeneration and water washing, and stretch it at high pressure and high speed with an air drafter to make it stacked on the receiving net to form a net-shaped non-woven fabric, and finally go through the procedures of water needle rolling, drying and co...
Embodiment 3
[0041] Mix wood pulp with a degree of polymerization of 1050 and oxidized methyl marlene 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, with Vacuum thin film evaporator evaporates excess water, heats at 80°C to 130°C, removes water to 9% to 13% within 5 minutes, and then dissolves cellulose into spinning dope. The composition of spinning dope is as follows As shown in [Table 1], the viscose is pumped into the spinning box by means of spunbond (spunbond) and pumped by a metering pump, and stretched outward through the spinning port by air gap cooling to form long fibers. The plain silk bundles are then put into the coagulation liquid for coagulation regeneration and washed with water, and stretched at high pressure and high speed by an air drafter, so that they are stacked on the receiving net to form a net-shaped non-woven fabric, and finally undergo water needle rolling...
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