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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

Active Publication Date: 2018-09-28
常德市德源招商投资有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the problems of safety risks and high preservation cost of traditional chemical preservatives in the prior art. The present invention provides a preparation method of fresh-keeping coated paper for fruits and vegetables

Method used

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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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Abstract

The invention belongs to the technical field of packaging materials and particularly relates to a preparation method of fresh-keeping coated paper for fruits and vegetables. The preparation method comprises the following steps: by taking 2,3-epoxypropyltrimethylammonium chloride and triethylene glycol dimethacrylate as raw materials, carrying out quaternization and grafting modification on chitosan, then preparing coating liquid from the modified chitosan and polyvinyl alcohol, and coating the coating liquid on white cardboard to prepare antibacterial coated paper. The antibacterial coated paper prepared by the invention can be used for antirot and fresh keeping of various fruits and the vegetables.

Description

Technical field [0001] The invention belongs to the technical field of packaging materials, and specifically relates to a method for preparing fresh-keeping coated paper for fruits and vegetables. Background technique [0002] In recent years, my country's fruit and vegetable production has developed rapidly and the output is extremely abundant. However, fruits and vegetables are easy to deteriorate and rot after being picked, which seriously affects the transportation, storage and food quality of fruits and vegetables. Therefore, the preservation of fruits and vegetables is particularly important. [0003] As a green, environmentally friendly and easily biodegradable fresh-keeping material, cling paper has become the research focus of domestic and foreign researchers. The fresh-keeping paper is prepared by adding a fresh-keeping agent to the paper base or coating it on the surface of the paper base. At present, there are related researches on chlorine dioxide fresh-keeping paper,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H19/12D21H21/36D21H27/10C08F251/00C08F222/20C08B37/08
CPCC08B37/003C08F251/00D21H19/12D21H21/36D21H27/10C08F222/20
Inventor 余赞田璐钟文罗臻
Owner 常德市德源招商投资有限公司
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