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Preparation method and application of natural ionic liquid preservative film

A technology of ionic liquid and fresh-keeping film, which is applied in the field of multifunctional film materials to achieve the effects of low water vapor transmission coefficient, improved tensile strength, enhanced elasticity and flexibility

Active Publication Date: 2021-05-25
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ionic liquids they use are imidazole ionic liquids or alkylpyridinium ions, so there is a risk in applying their films to food preservation or packaging

Method used

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  • Preparation method and application of natural ionic liquid preservative film
  • Preparation method and application of natural ionic liquid preservative film
  • Preparation method and application of natural ionic liquid preservative film

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preparation example Construction

[0032] The first aspect of the present invention provides a kind of preparation method of natural ionic liquid fresh-keeping film, comprises the following steps:

[0033] S1: Preparation of ionic liquid: Dissolve the acidic component and the basic component in the solvent respectively to obtain the acid solution and the alkali solution, add the acid solution to the alkali solution, after the addition is completed, stir for 4 to 24 hours under a nitrogen atmosphere. It is mixed evenly, and then the solvent is removed by vacuum rotary evaporation to obtain an ionic liquid;

[0034] S2: Preparation of natural ionic liquid preservative film: Add ionic liquid to natural polymer aqueous solution and mix evenly to obtain a mixed solution. After ultrasonic treatment of the mixed solution for 30-90 minutes, pour the mixed solution into a smooth glass dish inside, and place it in a 40-80°C refrigerator. 12 to 28 hours in an oven to obtain a natural ionic liquid preservative film.

[00...

Embodiment 1

[0081] Preparation of ionic liquids

[0082] Dissolve the acidic component and the basic component in the solvent respectively to obtain an acidic solution and an alkaline solution. Add the acidic solution to the alkaline solution. After the addition is complete, stir for 18 hours under a nitrogen protection atmosphere to make it evenly mixed, and then evaporate in a vacuum The ionic liquid is obtained by removing the solvent by method; the acidic component: solvent=1mg: 5mL; the basic component: solvent=1mg: 5mL; the method of adding the acid solution to the alkali solution in step S1: divide the acid solution evenly by weight It is 8 parts, joins in the alkali solution respectively, and the time of each adding interval is 1.5min; The molar ratio of described acidic component and alkaline component is 1: 1; Described acidic component is coconut oil acid; Said alkali The active ingredient is matrine; the solvent is ethanol.

[0083] The coconut oil was purchased from Maya Rea...

Embodiment 2

[0085] Preparation of ionic liquids

[0086] Dissolve the acidic component and the basic component in the solvent respectively to obtain an acidic solution and an alkaline solution. Add the acidic solution to the alkaline solution. After the addition is complete, stir for 18 hours under a nitrogen protection atmosphere to make it evenly mixed, and then evaporate in a vacuum The ionic liquid is obtained by removing the solvent by method; the acidic component: solvent=1mg: 5mL; the basic component: solvent=1mg: 5mL; the method of adding the acid solution to the alkali solution in step S1: divide the acid solution evenly by weight It is 8 parts, respectively added in the alkali solution, and the time between each addition is 1.5min; the molar ratio of the acidic component and the basic component is 1:1; the acidic component is salicylic acid; the alkali The active ingredient is choline bicarbonate; the solvent is ethanol.

[0087] The salicylic acid was purchased from Maya Reage...

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Abstract

The invention relates to the field of multifunctional film materials, in particular to a preparation method and application of a natural ionic liquid preservative film. The preparation method of a natural ionic liquid preservative film comprises the following steps of: S1, preparation of ionic liquid: respectively dissolving an acidic component and an alkaline component in a solvent to obtain an acid solution and an alkaline solution, adding the acid solution into the alkaline solution, stirring for 4-24 hours in a nitrogen protection atmosphere after the acid solution is added, so as to uniformly mix the acid solution and the alkaline solution, and removing the solvent through a vacuum rotary evaporation method to obtain the ionic liquid; and S2, preparation of the natural ionic liquid preservative film: adding the ionic liquid into a natural polymer aqueous solution, uniformly mixing to obtain a mixed solution, performing ultrasonic treatment on the mixed solution for 30-90 minutes, pouring the mixed solution into a glass dish with a smooth interior, and putting the glass dish into a drying oven at 40-80 DEG C for 12-28 hours to obtain the natural ionic liquid preservative film. The prepared natural ionic liquid preservative film not only has good mechanical properties, but also has the functions of bacteriostasis, oxidation resistance and the like.

Description

technical field [0001] The invention relates to the field of multifunctional membrane materials, in particular to a preparation method and application of a natural ionic liquid fresh-keeping film. Background technique [0002] At present, most of the food preservation films used and sold in the market are plastic products prepared by polymerization of ethylene. On the one hand, plastic products will cause harm to the environment, which is often called white pollution. White pollution will have adverse effects on water, soil, and the atmosphere, thereby causing damage to the health of organisms living in it and causing various diseases; People are satisfied, but rarely have the ability to produce lethality to microbial contamination or to inhibit and regulate oxidation reactions. Therefore, the research on the preparation of an environmentally friendly and green functional film material with certain antibacterial and antioxidative properties has attracted extensive attention...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L89/00C08K5/09C08K5/3432C08K5/13C08K5/19
CPCC08J5/18C08K5/09C08K5/3432C08K5/13C08K5/19C08J2389/00
Inventor 张嘉恒王好杜怡湘王密喻文吴称玉
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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