PVA (polyvinyl alcohol) film modified by one-step reaction extrusion method as well as preparation method and application of PVA film
A technology of reaction extrusion and thin film, which is applied in the field of PVA film modified by one-step reaction extrusion method and its preparation, can solve the problems of reduced antibacterial stability, etc., and achieve improved bactericidal ability, good antibacterial effect, and extended shelf life. Effect
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Embodiment 1
[0033] (1) twin-screw reactive extrusion modification: in parts by mass, the screw speed of the twin-screw extruder is set to 50 rpm, and the heating temperatures in the melting zone, the reaction zone, and the conveying zone are 60, 65, and 70° C. respectively. Slowly add 5 parts of epichlorohydrin and 5 parts of cetyl dimethyl ammonium, then add 5 parts of chitosan and 10 parts of 50% isopropanol solution, slowly stir and disperse evenly, add 5 parts of 1mol / L hydrogen Sodium oxide solution, constant temperature reaction for 2-4h, after the nucleophilic substitution reaction is complete, a reaction extrusion modified quaternary ammonium salt chitosan is obtained;
[0034] (2) Single-screw extrusion film formation: adjust the screw speed of the single-screw extruder to 80 rpm, the heating temperature of each zone in the banburying zone, the conveying zone and the pressure building zone are 80, 85 and 90 °C respectively, and 10 parts are added to the feeding port. PVA, 3 parts...
Embodiment 2
[0036](1) twin-screw reactive extrusion modification: in parts by mass, the screw speed of the twin-screw extruder is set to 50 rpm, and the heating temperatures in the melting zone, the reaction zone, and the conveying zone are 60, 65, and 70° C. respectively. Slowly add 5 parts of epichlorohydrin and 5 parts of cetyl dimethyl ammonium, then add 10 parts of chitosan and 10 parts of 50% isopropanol solution, slowly stir and disperse evenly, add 5 parts of 1mol / L hydrogen Sodium oxide solution, constant temperature reaction for 2-4h, after the nucleophilic substitution reaction is complete, a reaction extrusion modified quaternary ammonium salt chitosan is obtained;
[0037] (2) Single-screw extrusion film formation: adjust the screw speed of the single-screw extruder to 80 rpm, and the heating temperature of each zone in the banburying zone, the conveying zone, and the pressure building zone are 80, 85, and 90 °C, respectively, and add 10 parts to the feeding port. PVA, 3 part...
Embodiment 3
[0039] (1) twin-screw reactive extrusion modification: in parts by mass, the screw speed of the twin-screw extruder is set to 50 rpm, and the heating temperatures in the melting zone, the reaction zone, and the conveying zone are 60, 65, and 70° C. respectively. Slowly add 5 parts of epichlorohydrin and 5 parts of cetyl dimethyl ammonium, then add 15 parts of chitosan and 10 parts of 50% isopropanol solution, slowly stir and disperse evenly, add 5 parts of 1mol / L hydrogen Sodium oxide solution, constant temperature reaction for 2-4h, after the nucleophilic substitution reaction is complete, a reaction extrusion modified quaternary ammonium salt chitosan is obtained;
[0040] (2) Single-screw extrusion film formation: adjust the screw speed of the single-screw extruder to 80 rpm, and the heating temperature of each zone in the banburying zone, the conveying zone, and the pressure building zone are 80, 85, and 90 °C, respectively, and add 10 parts to the feeding port. PVA, 3 par...
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