A kind of preparation method of fresh-keeping coated paper for fruits and vegetables
A technology for coating paper, fruits and vegetables, applied in papermaking, coating, paper, etc., can solve the problems of safety risks and high cost of preservation
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Embodiment 1
[0022] 1) Quaternization of chitosan: Add 16.1g of chitosan (deacetylation degree 92%), 200ml of water into a 1L three-necked glass reaction flask, and then add 0.03g of sodium dodecylbenzene sulfonate and heat to Stir at 70°C for 10 minutes, add 10.5g of 2,3-epoxypropyltrimethylammonium chloride at a time, keep stirring for 12h, then cool to 20-30°C, drop 200ml methanol and settle for 2h at -10°C, then filter, The quaternary ammonium salted chitosan is obtained by vacuum drying at 60°C; it is best to add methanol by dripping during the sedimentation process. If methanol is added at once, aggregation will occur, and the sedimented product will be attached to the reaction flask. On the wall, it is not conducive to the later filtration and transfer;
[0023] 2) Graft modification of chitosan: add 10g of quaternized chitosan to 100ml of aqueous solution, stir at 70°C under nitrogen atmosphere for 30min; then add 0.1g of ammonium persulfate and stir for 15min, add 2.0g The graft cop...
Embodiment 2
[0027] 1) Quaternization of chitosan: add 16.1g of chitosan (with a degree of deacetylation of 96%), 200ml of water into a 1L three-necked glass reaction flask, and then add 0.03g of sodium dodecylbenzene sulfonate and heat up to Stir at 70°C for 10 minutes, add 10.5g of 2,3-epoxypropyltrimethylammonium chloride at a time, keep stirring for 12h, then drop the temperature to 20-30°C and add 200ml methanol dropwise, settle at -15°C for 2h, then filter, The quaternized chitosan is obtained by vacuum drying at 60°C;
[0028] 2) Graft modification of chitosan: add 10g of quaternized chitosan to 100ml of aqueous solution, stir at 70°C under nitrogen atmosphere for 30min; then add 0.1g of ammonium persulfate and stir for 15min, add 4.0g The graft copolymerization of triethylene glycol dimethacrylate and 0.2g methylene bisacrylamide was carried out for 6 hours, then the temperature was reduced to 20-30°C, filtered and the filter cake was washed with water. The filter cake was made of 20m...
Embodiment 3
[0032] 1) Quaternization of chitosan: add 16.1g of chitosan to a 1L three-necked glass reaction flask (degree of deacetylation is 98%, relative molecular weight of viscosity is 2.9x10 5 ), 200ml of water, and then add 0.03g of sodium dodecylbenzene sulfonate and raise the temperature to 70°C and stir for 10min, add 6.8g of 2,3-epoxypropyltrimethylammonium chloride at once, keep stirring for 12h, then cool down Add 200ml methanol dropwise to 20-30℃, settle for 2h at -15℃, then filter and vacuum-dry at 60℃ to obtain quaternized chitosan;
[0033] 2) Graft modification of chitosan: add 10g of quaternized chitosan to 100ml of aqueous solution, stir at 70℃ under nitrogen atmosphere for 30min; then add 0.1g of ammonium persulfate and stir for 15min, add 3.2g The graft copolymerization of triethylene glycol dimethacrylate and 0.2g methylene bisacrylamide was carried out for 6 hours, then the temperature was lowered to 20-30℃, filtered, and the filter cake was washed with water. The filte...
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