Temperature-sensitive type gas phase sustained-release preservation composite film of baked food and preparation method thereof
A baked food and temperature-sensitive technology, which is applied in the field of temperature-sensitive slow-release gas-phase fresh-keeping composite film and its preparation field, can solve the problems of unsatisfactory anti-corrosion and fresh-keeping effect, restricted baked food, and high packaging cost, achieves good fresh-keeping effect, inhibits Microbial growth, shelf life extension effect
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Embodiment 1
[0029] React 1mol of polycaprolactone (PCL, Mw=3000), 2mol of 4,4′-diphenylmethane diisocyanate (MDI), and 700g of N,N-dimethylformamide (DMF) solvent at 70°C 1.5h, the formation of soft segment phase. Then add metered BDO and MDI and react at 70°C for 1.5h to form hard segments, and the soft and hard segments alternately form block polymers; during the reaction, keep the molar ratio of -NCO and -OH groups at 1:1, use DMF adjusted the viscosity change in the reaction system, and the solid content of the temperature-sensitive polyurethane solution was controlled at 25wt%. Further use DMF to adjust the solid content to 15wt%, place it on a polytetrafluoroethylene template, and evaporate the DMF solvent at 60°C to obtain a temperature-sensitive polyurethane film. On the prepared polyurethane film, brush for Antibacterial agent (carvacrol) with 2% film weight, the treated polyurethane film and nylon are bonded by hot press at a temperature of 90°C, a pressure of 0.2MPa, and a tim...
Embodiment 2
[0031] 2mol polycaprolactone (PCL, Mw=4000), 3.5mol 4,4′-diphenylmethane diisocyanate (MDI), 1200g N,N-dimethylformamide (DMF) solvent, at 75°C After 1 hour of reaction, a soft segment phase was formed. Then add metered BDO and MDI and react at 80°C for 1.5h to form hard segments, and the soft and hard segments alternately form block polymers; during the reaction, keep the molar ratio of -NCO and -OH groups at 1:1, use DMF adjusted the viscosity change in the reaction system, and the solid content of the temperature-sensitive polyurethane solution was controlled to 45wt%. Further use DMF to adjust the solid content to 25wt%, place it on a polytetrafluoroethylene template, and evaporate the DMF solvent at 75°C to obtain a temperature-sensitive polyurethane film. On the prepared polyurethane film, brush for Antibacterial agent (cinnamaldehyde) with 2% film weight, the treated polyurethane film and nylon are bonded by hot press at a temperature of 90°C, a pressure of 0.15MPa, an...
Embodiment 3
[0032]0.2mol polycaprolactone (PCL, Mw=8000), 0.5mol 4,4′-diphenylmethane diisocyanate (MDI), 400g N,N-dimethylformamide (DMF) solvent, at 80°C Under reaction for 2h, a soft segment phase is formed. Then add metered BDO and MDI and react at 80°C for 2 hours to form hard segments, and the soft and hard segments alternately form block polymers; during the reaction, keep the molar ratio of -NCO and -OH groups at 1:1, use DMF The viscosity change in the reaction system was adjusted, and the solid content of the temperature-sensitive polyurethane solution was controlled to 30wt%. Further use DMF to adjust the solid content to 20wt%, place it on a polytetrafluoroethylene template, and evaporate the DMF solvent at 70°C to obtain a temperature-sensitive polyurethane film. On the prepared polyurethane film, brush and coat antibacterial agent (1% carvacrol + 1% cinnamaldehyde), the treated polyurethane film and nylon were bonded with a hot press at a temperature of 120°C, a pressure of...
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