Silver-loaded tannin polyphenol crosslinked polyvinyl alcohol antibacterial hydrogel and preparation method thereof
A technology of cross-linking polyvinyl alcohol and tannin polyphenols, which is applied in the fields of biomedical materials and polymer chemistry, can solve the problems that polyphenol-based hydrogels are rare and uncommon, and achieve short preparation time and adjustable performance Change, the effect of simple preparation method
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Embodiment 1
[0031] Add 1g of tannic acid and 0.05g of silver nitrate into a 50mL stainless steel ball milling tank, and mix them by ball milling for 10min to obtain a gray silver-loaded polyphenol hybrid, then add 2g of polyvinyl alcohol and 20mL of deionized water, and continue ball milling for 10min to obtain The gel-like product was frozen in a cold trap at -25°C for 12 hours, and then thawed at room temperature. This repeated freezing and thawing 5 times, and finally silver-loaded tannic acid cross-linked polyvinyl alcohol antibacterial hydrogel was obtained. In the past, the preparation time of silver-loaded hydrogel by solution method is often more than 10 hours, but this technology adopts ball milling method, which accelerates the coordination and reduction time between silver and polyphenols, thus greatly speeding up the preparation of silver-loaded hydrogel time.
[0032] figure 1 Schematic diagram of the structure of the silver-loaded tannic acid cross-linked polyvinyl alcohol ...
Embodiment 2
[0037] Add 1 g of tannic acid and 0.05 g of silver nitrate into a 50 mL stainless steel ball milling tank, and mix by ball milling for 30 minutes to obtain a gray silver-loaded polyphenol hybrid, then add 1 g of polyvinyl alcohol and 20 mL of deionized water, and continue ball milling for 30 minutes to obtain The gel-like product was frozen in a cold trap at -25°C for 12 hours, and then thawed at room temperature. This repeated freezing and thawing 5 times, and finally silver-loaded tannic acid cross-linked polyvinyl alcohol antibacterial hydrogel was obtained. Image 6 Photographs of the obtained samples.
[0038] Figure 5 It can be seen that when the ratio of silver-loaded tannic acid to polyvinyl alcohol is increased, the obtained hydrogel still has good elasticity and mechanical strength.
Embodiment 3
[0040] Add 1 g of ellagic acid and 0.05 g of silver nitrate into a 50 mL stainless steel ball mill jar, and mix by ball milling for 30 minutes to obtain a gray silver-loaded polyphenol hybrid, then add 2 g of polyvinyl alcohol and 20 mL of deionized water, and continue ball milling for 30 minutes to obtain The gel-like product was frozen in a cold trap at -25°C for 12 hours, and then thawed at room temperature. This repeated freezing and thawing 5 times, and finally the silver-loaded ellagic acid cross-linked polyvinyl alcohol antibacterial hydrogel was obtained.
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