A kind of chitosan oligosaccharide nano-silver and latex blend antibacterial substance and preparation method thereof
A technology of chitosan oligosaccharide and nano-silver, which is applied in the field of antibacterial materials, can solve the problems of thermal stability and tensile strength decline, threats to human health, and lack of antibacterial performance of chitosan, so as to achieve safe antibacterial performance and eliminate toxic substances. The use of chemical reagents and the effect of easy operation
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Embodiment 1
[0034] (1) Silver nitrate solution (0.1%wt) and water-soluble chitosan (0.1%wt) solution were added to the stirrer at a volume ratio of 1:9, and stirred evenly at room temperature for 1h.
[0035] (2) Put the above mixed solution in a 4mL quartz cuvette, pass nitrogen gas for 20s to remove all the air and seal it.
[0036] (3) Place the quartz cuvette at a distance of 5cm from a 272nm ultraviolet lamp and irradiate it for 30min with a power of 20w.
[0037] (4) Add one volume of absolute ethanol to the mixed solution and centrifuge at 14000r / min for 60min to get the precipitate, and wash it twice with 50%wt ethanol, and redissolve in ultrapure water to obtain chitosan-coated nano-silver antibacterial agent Dispersions.
[0038] (5) natural rubber latex (solid content 50%) is filtered with 80 mesh molecular sieves, nitrogen gas 1h is sloughed wherein ammonia under uniform stirring,
[0039] (6) Chitooligosaccharide-coated nano-silver aqueous solution (125 μg / mL) and pretreate...
Embodiment 2
[0047] According to the process method of Example 1, the difference of Example 2 is that the aqueous solution concentration of oligochitosan-coated nano-silver is 250 μg / mL, and the mass ratio of chitosan-coated nano-silver to natural rubber latex is 50:100000. Compared with Example 1, this embodiment further increases the amount of nano-silver coated with chitosan oligosaccharide, and the concentration of nano-silver is further improved.
[0048] The antibacterial test is the same as in Example 1.
[0049] The test results are shown in Table 1. The antibacterial rate of oligochitosan nano silver and latex blended antibacterial substance against Escherichia coli was 94.7%, and the antibacterial rate against Staphylococcus aureus was 83.8%.
Embodiment 3
[0051] According to the process of Example 1, the difference of Example 3 is that the concentration of the aqueous solution of oligochitosan-coated nano-silver is 500 μg / mL, and the mass ratio of chitosan-coated nano-silver to natural rubber latex is 100:100000. Compared with Example 1, this embodiment further increases the amount of nano-silver coated with chitosan oligosaccharide, and the concentration of nano-silver is further improved.
[0052] The antibacterial test is the same as in Example 1.
[0053] The test results are shown in attached table 1. The antibacterial rate of oligochitosan nano silver and latex blended antibacterial substance against Escherichia coli was 100%, and the antibacterial rate against Staphylococcus aureus was 100%.
[0054] Table 1
[0055]
[0056] The chitosan oligosaccharide nano-silver and latex blended antibacterial substances prepared by this method were tested by patch method: under the culture condition of 37 °C, the growth of Esche...
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