Method for preparing nano-silver blended natural cellulose melt-blown non-woven fabric
A natural cellulose and nano-silver technology, applied in the direction of single-component cellulose artificial filaments, non-woven fabrics, fiber chemical characteristics, etc., can solve problems such as environmental impact, burden, and 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 it should be light brown when it reaches the titration end point.
[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 quantitative analysis, the particle size dis...
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] ], the mucus is pumped by a metering pump in a melt blown manner (meltblown), filtered by a continuous filter (CPF), degassed, and then enters the spinning box, and is continuously poured into the spinning port by hot air and from The airflow discharged around the spinning port forces the mucus to be extruded from the spinning port to form long cellulose tows, and then enter the coagulation liquid to solidify, regenerate and wash with water, and the long cellulose tows will be piled up on the receiving net The non-woven fabric folde...
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 mucus is transported by a metering pump in a melt blown manner (meltblown), filtered by a continuous filter (CPF), degassed, and then enters the spinning box, and is continuously poured into the spinning port by hot air and blown. The airflow discharged from around the spinning port forces the mucus to be extruded from the spinning port to form long cellulose tows, and then enters the coagulation liquid to solidify, regenerate and wash with water. The long cellulose tows will interact...
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