Preparation method of hydrophobic film for indicating food freshness

A technology for hydrophobic film and freshness, which is applied in the field of preparation of hydrophobic films, can solve the problems of affecting the indicating function of the film, uneven pigment dispersion, pigment migration and dissolution, etc., and achieves good mechanical properties, simple preparation, and in-situ detection of freshness. Effect

Inactive Publication Date: 2020-07-17
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the shortcomings of these studies are that these films use hydrophilic substrates to embed natural pigments, causing the films to easily absorb water in high humidity environments, resulting in film swelling, uneven dispersion of pigments, and pigments from the film to the environment. migration dissolution phenomenon
And this uncontrollable uneven distribution of pigment or pigment migration and dissolution will seriously affect the indicating function of the film.

Method used

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  • Preparation method of hydrophobic film for indicating food freshness
  • Preparation method of hydrophobic film for indicating food freshness
  • Preparation method of hydrophobic film for indicating food freshness

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh 1g of curcumin powder and 100g of low-density polyethylene pellets, stir and mix with a stirrer, so that curcumin is evenly adsorbed on the surface of low-density polyethylene pellets; add the mixed low-density polyethylene-curcumin pellets to the twin-screw In the extrusion granulator, the temperature of the four-stage heating chamber is set at 100°C, 110°C, 120°C, and 130°C; the granulation is carried out through the die and the granulator, and the curcumin is evenly distributed inside and outside the pellets. Density polyethylene-curcumin composite pellets; the obtained low-density polyethylene-curcumin composite pellets are added to the extrusion blown film machine, the temperature of the heating chamber is set to 130°C, the cooling air volume is 1.3L / s, and the blown The ratio is 1.5, and the low-density polyethylene-curcumin composite film is obtained by blow molding.

Embodiment 2

[0032] Take by weighing 0.1g curcumin powder and 100g ethylene-vinyl acetate copolymer pellets (wherein the content of vinyl acetate in the ethylene-vinyl acetate copolymer is 10%) and stir and mix with a stirrer; make turmeric uniformly adsorb on ethylene-acetic acid Vinyl ester copolymer surface. Add the mixed ethylene-vinyl acetate copolymer-curcumin pellets into the twin-screw extrusion granulator, set the temperature of the four-stage heating chamber at 80°C, 90°C, 90°C, and 100°C; Granulator carries out granulation, obtains the ethylene-vinyl acetate copolymer-curcumin compound grain that curcumin is all uniformly distributed inside and outside the material grain; The ethylene-vinyl acetate copolymer-curcumin compound grain obtained is added In the extrusion blown film machine, set the temperature of the heating chamber to 95°C, the cooling air volume to 0L / s, and the inflation ratio to 1, and obtain an ethylene-vinyl acetate copolymer-curcumin composite film by blow mol...

Embodiment 3

[0034]Take by weighing 10g of curcumin powder, 100g of polypropylene pellets, and 1g of polyethylene glycol, stir and mix with a stirrer, so that curcumin is evenly adsorbed on the surface of polypropylene pellets. Add the mixed polypropylene-curcumin granules into the twin-screw extrusion granulator, set the temperature of the four-stage heating chamber at 140°C, 155°C, 165°C, and 170°C; granulate through the die and pelletizer , obtain the polypropylene-curcumin compound grain that curcumin is all evenly distributed inside and outside the material grain; Join the obtained polypropylene-curcumin compound grain in the extrusion film blowing machine, set the temperature of the heating chamber to be 170°C, The cooling air volume is 4L / s, the inflation ratio is 3, and the ethylene-vinyl acetate copolymer-curcumin composite film is obtained by blow molding.

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Abstract

The invention belongs to the technical field of intelligent food packaging, and particularly relates to a preparation method of a hydrophobic film for indicating food freshness. The method comprises the following steps: stirring and mixing curcumin, hydrophobic polymer particles and a plasticizer to obtain a curcumin-hydrophobic polymer particle mixture; uniformly mixing the raw materials, then adding the mixture into a double-screw extruder, setting a heating temperature, and carrying out extrusion granulation by virtue of a mouth film and a granulator, so as to form curcumin-hydrophobic polymer composite granules; then adding into an extrusion film blowing machine, and setting a heating temperature, a cooling air volume and a blow-up ratio to prepare a curcumin-hydrophobic polymer film;according to the invention, the curcumin is embedded in a low-density polyethylene film by utilizing a melt extrusion film blowing method to prepare a hydrophobic film, and the hydrophobic film has the advantages of being good in mechanical property, safe, non-toxic and simple to prepare; and the film has response to alkaline gas, so that the film has a good application prospect in the aspect of indicating the freshness of food.

Description

technical field [0001] The invention belongs to the technical field of food intelligent packaging, and in particular relates to a preparation method of a hydrophobic film used to indicate the freshness of food. Background technique [0002] Food quality and safety are directly related to food safety. With the development of social economy, people put forward higher requirements for food safety. The quality of food is easily affected by factors such as ambient temperature, humidity, light and gas composition. Since these environmental factors are usually difficult to control during the food circulation process, the actual shelf life of food is often difficult to determine and predict. Therefore, it is of great significance to develop technologies that can indicate food quality in real time. [0003] Food intelligent packaging is a packaging technology that has emerged in the past two decades. It usually refers to the use of sensors, indicators or data carriers placed in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/06C08L23/08C08L23/12C08L71/02C08K5/132C08J5/18B65D65/38
CPCC08J5/18B65D65/38C08J2323/06C08J2323/08C08J2323/12C08J2471/02C08K5/132
Inventor 邹小波翟晓东石吉勇李志华黄晓玮孙悦张俊俊杨志坤
Owner JIANGSU UNIV
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