Bacterial cellulose-polyurethane composite material as well as preparation method and application thereof
A technology of bacterial cellulose and composite materials, applied in the field of skin repair, can solve the problems such as the lack of waterproof and antibacterial properties of the three-dimensional nano network structure, the restriction of the application of bacterial cellulose hydrogel dressings, the high water vapor transmission rate, etc. Hydrophilic properties and water absorption capacity, good biocompatibility, and the effect of improving mechanical properties
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Embodiment 1
[0059] This implementation provides a kind of preparation method of bacterial cellulose-polyurethane composite material, it may further comprise the steps:
[0060] Step 1: Soak the bacterial cellulose obtained by fermentation of Acetobacter xylinum in 4% NaOH aqueous solution, heat at 100°C for 6 hours, and then rinse repeatedly with distilled water until neutral; then use high-speed dispersion machine, at a speed of 25,000 rpm, homogenize the purified bacterial cellulose sample for 10 minutes to obtain bacterial cellulose microfibrils with a length of 0.1 μm and a diameter of 50 nm.
[0061] Step 2, soak the homogenized bacterial cellulose microfibers in absolute ethanol for 8 hours to ensure that the bacterial cellulose microfibers are completely dehydrated, and then soak the dehydrated bacterial cellulose microfibers in an organic solvent ethyl ethyl alcohol In glycol acetate for 48h, the preparation obtains composite A, and described composite A is 100wt% by weight, compr...
Embodiment 2
[0069] This implementation provides a kind of preparation method of bacterial cellulose-polyurethane composite material, it may further comprise the steps:
[0070] Step 1: Soak bacterial cellulose obtained by fermenting and culturing Rhizobium and Sarcina in 5% NaOH aqueous solution, heat at 90°C for 5 hours, and then rinse repeatedly with distilled water until neutral and then using a high-speed disperser at a speed of 20,000 rpm to homogenize the purified bacterial cellulose sample for 5 minutes to obtain bacterial cellulose microfibrils with a length of 2 μm and a diameter of 60 nm.
[0071] Step 2, soak the homogenized bacterial cellulose microfibers in absolute ethanol for 10 h to ensure that the bacterial cellulose microfibers are completely dehydrated, and then soak the dehydrated bacterial cellulose microfibers in an organic solvent ethyl acetate 36 h in the ester, the preparation obtains composite A, and described composite A is 100wt% by weight, comprises the bacter...
Embodiment 3
[0079] This implementation provides a kind of preparation method of bacterial cellulose-polyurethane composite material, it may further comprise the steps:
[0080] Step 1: Soak bacterial cellulose obtained by fermenting and culturing Pseudomonas and Achromobacter in 6% NaOH aqueous solution, heat at 80°C for 4 hours, and then rinse repeatedly with distilled water until Neutral; then use a high-speed disperser at a speed of 25,000 rpm to homogenize the purified bacterial cellulose sample for 6 minutes to obtain bacterial cellulose microfibrils with a length of 4 μm and a diameter of 70 nm.
[0081] Step 2, soak the homogenized bacterial cellulose microfibers in absolute ethanol for 9 hours to ensure that the bacterial cellulose microfibers are completely dehydrated, and then soak the dehydrated bacterial cellulose microfibers in the organic solvent butyrolactone In 72h, the compound A was prepared, and the compound A was 100wt% in parts by weight, including 50wt% bacterial cel...
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