Method for preparing antibacterial polylactic acid membrane material
A film material, polylactic acid technology, applied in the field of preparation of antibacterial polylactic acid film materials, can solve the problems of limiting the application of polylactic acid, poor toughness, etc., and achieve the effects of improved dispersion, good mechanical properties, and high antibacterial effect
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Embodiment 1
[0018] 1) Put 20 parts of hemp fibers into 1mol / L sodium hydroxide solution, heat to 100°C under normal pressure, cook for 2 hours, take out after cooling, wash with 1mol / L hydrochloric acid until neutral, put After drying in an oven, put it into a grinder and grind it into a 200-mesh powder for use; dissolve 0.8 parts of silane coupling agent kh-550 in distilled water to form an aqueous solution of silane coupling agent kh-550, and grind the hemp The fiber is soaked in it, heated to 40-50°C, soaked for 30-60 minutes, filtered out the precipitate, then put into an oven, and dried at 90-110°C for 2-4 hours to obtain hemp fiber powder;
[0019] 2) Add 3 parts of nano-zinc oxide, 1 part of stearic acid, and 15 parts of ethanol into the ball mill, and ball mill for 40-60 minutes to obtain a mixed slurry;
[0020] 3) Add 100 parts of polylactic acid and 30 parts of polyethylene glycol into the internal mixer, masticate at 150°C for 4 minutes, then add the hemp fiber powder prepared...
Embodiment 2
[0022] The polylactic acid in embodiment 1 can be made by the following steps: extract corn raw material, under the effect of biocatalyst maltase, add pure lactic acid and calcium carbonate to ferment, obtain fermented liquid; Add sulfuric acid to fermented liquid, the volume of sulfuric acid The percentage is 50%, fully stirred and filtered, the filtrate is evaporated and concentrated, and filtered again to obtain lactic acid; the lactic acid is refined, dehydrated, oligomerized, and pyrolyzed to generate a cyclic dimer lactide, and the lactic acid is concentrated in a special In the manufacturing process, it is transformed into lactide, that is, the intermediate product reduced water lactic acid, and then ring-opening polycondensation into polylactic acid.
Embodiment 3
[0024] The polylactic acid in embodiment 1 can be made by following steps: extract cassava raw material, under the effect of biocatalyst glucoamylase, add pure lactic acid and calcium carbonate to ferment, obtain fermented liquid; Add sulfuric acid in fermented liquid, the volume of sulfuric acid The percentage is 50%, fully stirred and filtered, the filtrate is evaporated and concentrated, and filtered again to obtain lactic acid; the lactic acid is refined, dehydrated, oligomerized, and pyrolyzed to generate a cyclic dimer lactide, and the lactic acid is concentrated in a special In the manufacturing process, it is transformed into lactide, that is, the intermediate product reduced water lactic acid, and then ring-opening polycondensation into polylactic acid.
[0025] The melting point of polylactic acid is 35-40 degrees. The degradation of polylactic acid will increase with the increase of processing temperature, and the melt viscosity of the polymer will decrease, which wi...
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