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Preparation method of fresh-keeping coated paper for fruits and vegetables

A technology of coated paper, fruits and vegetables, applied in the direction of coating, paper, papermaking, etc., which can solve the problems of safety risks and high cost of preservation

Active Publication Date: 2017-09-01
CHANGDE JINDE NEW MATERIAL TECH CO LTD
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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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  • Preparation method of fresh-keeping coated paper for fruits and vegetables

Examples

Experimental program
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Effect test

Embodiment 1

[0022] 1) Chitosan quaternization: add 16.1g chitosan (92% degree of deacetylation) and 200ml water to a 1L three-neck glass reaction flask, then add 0.03g sodium dodecylbenzenesulfonate and heat up to Stir at 70°C for 10min, add 10.5g of 2,3-epoxypropyltrimethylammonium chloride at one time, keep stirring and react for 12h, then cool down to 20-30°C, drop in 200ml of methanol, settle at -10°C for 2h, then filter , Vacuum drying at 60°C to obtain quaternized ammonium salted chitosan; it is best to add methanol dropwise during the sedimentation process. If methanol is added at one time, aggregation will occur, and the sedimented product will be attached to the reaction On the wall of the bottle, it is not conducive to the later filtration transfer;

[0023] 2) Graft modification of chitosan: Add 10g of quaternized chitosan to 100ml of aqueous solution, stir at 70°C for 30min under nitrogen atmosphere; then add 0.1g of ammonium persulfate and stir for 15min, then add 2.0g Triet...

Embodiment 2

[0027] 1) Chitosan quaternization: Add 16.1g chitosan (96% degree of deacetylation) and 200ml water to a 1L three-necked glass reaction flask, then add 0.03g sodium dodecylbenzenesulfonate and heat up to Stir at 70°C for 10min, add 10.5g of 2,3-epoxypropyltrimethylammonium chloride at one time, keep stirring and react for 12h, then cool down to 20-30°C and add 200ml of methanol dropwise, settle at -15°C for 2h, then filter , Vacuum drying at 60°C to obtain quaternized chitosan;

[0028] 2) Graft modification of chitosan: add 10g of quaternized chitosan to 100ml of aqueous solution, stir at 70°C for 30min under nitrogen atmosphere; then add 0.1g of ammonium persulfate and stir for 15min, add 4.0g Triethylene glycol dimethacrylate and 0.2g methylene bisacrylamide were grafted and copolymerized for 6 hours, then cooled to 20-30°C, filtered, and washed with water, and the filter cake was washed with 20ml of 0.2mol / L After soaking in ammonia solution for 30 minutes, filter with su...

Embodiment 3

[0032] 1) Chitosan quaternization: add 16.1g chitosan (deacetylation degree is 98%, viscosity-average molecular mass is 2.9x10 5), 200ml of water, then add 0.03g of sodium dodecylbenzenesulfonate and raise the temperature to 70°C and stir for 10min, add 6.8g of 2,3-epoxypropyltrimethylammonium chloride at one time, keep stirring and react for 12h, then cool down Add 200ml of methanol dropwise at 20-30°C, settle at -15°C for 2 hours, then filter and dry under vacuum at 60°C to obtain quaternized chitosan;

[0033] 2) Graft modification of chitosan: Add 10g of quaternized chitosan to 100ml of aqueous solution, stir at 70°C for 30min under nitrogen atmosphere; then add 0.1g of ammonium persulfate and stir for 15min, then add 3.2g Triethylene glycol dimethacrylate and 0.2g methylene bisacrylamide were grafted and copolymerized for 6 hours, then cooled to 20-30°C, filtered, and washed with water, and the filter cake was washed with 20ml of 0.2mol / L After soaking in ammonia solutio...

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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 in particular relates to a preparation method of 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 rich. However, fruits and vegetables are easy to deteriorate and rot after picking, seriously affecting the transportation, storage and food quality of fruits and vegetables. Therefore, the preservation of fruits and vegetables is particularly important. [0003] Fresh-keeping paper, as a green and biodegradable fresh-keeping material, has become the research focus of domestic and foreign researchers. The preparation of fresh-keeping paper is to add preservative to the paper base or apply it on the surface of the paper base. At present, there are related researches on chlorine dioxide fresh-keeping paper, tourmaline fresh-keeping paper, Ch...

Claims

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Application Information

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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 CHANGDE JINDE NEW MATERIAL TECH CO LTD
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