Hydrophobicfood packaging film and preparation method thereof

A food packaging film, hydrophobic type technology, applied in the field of hydrophobic food preservation film and its preparation, can solve the problems of easy water absorption, mechanical properties, deterioration, etc., achieve good biocompatibility and degradability, freshness preservation performance, and enhance hydrophobicity Performance, enhanced toughness effect

Inactive Publication Date: 2020-01-07
MINNAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a hydrophobic food preservation film and its preparation method by using the high hydrophobicity of lotus leaf cutin to solve the problem that the current bio-based food preservation film is easy to absorb water and its mechanical properties deteriorate rapidly after absorbing water

Method used

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  • Hydrophobicfood packaging film and preparation method thereof

Examples

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preparation example Construction

[0051] The invention also provides a method for extracting the lotus leaf cutin and a method for preparing a hydrophobic food preservation film, including the following steps:

[0052] 1) Put 200-300 portions of fresh lotus leaves in a blast oven and dry. Use a powdering machine to crush the lotus leaf and sieve to obtain 80-100 mesh lotus leaf powder;

[0053] 2) Disperse 50-60 parts of dried lotus leaf powder in 500 parts of water, add 2-3 parts of pectinase and 1-2 parts of cellulase, and then ultrasonically shake in an ultrasonic disperser for 10-20 minutes, and then Place it in a water bath at 35-40 ℃ and heat for 48 hours to enzymolyze pectin and cellulose to promote the dispersion of lotus leaf powder;

[0054] 3) Add NaOH powder to the above suspension, adjust its pH to 12-14, then place it in an ultrasonic disperser and sonicate for 10 minutes to remove air from the liquid, and pour the suspension into polytetrafluoroethylene In the reactor, use high-purity nitrogen to pur...

Embodiment 1

[0063] A hydrophobic food fresh-keeping film, which is prepared from the following parts by weight of raw materials:

[0064] 20 parts of low methoxy pectin (degree of methyl esterification is 20-30%);

[0065] 20 parts of chitosan;

[0066] 10 parts of glycerin;

[0067] 3 parts acetic acid

[0068] 15 lotus leaf cutin

[0069] Furthermore, the extraction of the cutin of the lotus leaf involves the following raw materials:

[0070] 300 servings of fresh lotus leaves

[0071] Pectinase 2 parts

[0072] Cellulase 2 parts

[0073] The invention also provides a method for extracting the lotus leaf cutin and a method for preparing a hydrophobic food preservation film, including the following steps:

[0074] 1) Put 300 portions of fresh lotus leaves in a blast oven and dry. Use a powdering machine to crush the lotus leaf and sieve to obtain 80-100 mesh lotus leaf powder;

[0075] 2) Disperse 50 parts of dried lotus leaf powder in 500 parts of water, add 2 parts of pectinase and 2 parts of cellulas...

Embodiment 2

[0085] A hydrophobic food fresh-keeping film, which is prepared from the following parts by weight of raw materials:

[0086] 20 parts of low methoxy pectin (degree of methyl esterification is 20-30%);

[0087] 20 parts of chitosan;

[0088] 5 parts of glycerin;

[0089] 3 parts acetic acid

[0090] 15 lotus leaf cutin

[0091] Furthermore, the extraction of the cutin of the lotus leaf involves the following raw materials:

[0092] 300 servings of fresh lotus leaves

[0093] Pectinase 2 parts

[0094] Cellulase 2 parts

[0095] The specific preparation method is the same as in Example 1. In this example, the amount of glycerin added is relatively low, and the tensile strength of the composite film is high, but the toughness is poor.

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Abstract

The invention relates to the technical field of food fresh-keeping film preparation, particularly to a hydrophobic food packaging film and a preparation method thereof, wherein the hydrophobic food packaging film is prepared from the following raw materials by weight: 15-30 parts of low-methoxy pectin, 15-30 parts of chitosan, 5-15 parts of glycerol, 3-5 parts of acetic acid and 10-20 parts of lotus leaf cutin. According to the invention, lotus leaves are used as main raw materials, cutin is extracted, blending is performed with pectin, chitosan and glycerol, and finally the fresh-keeping filmis prepared through a casting method, so that the product has good hydrophobicity, the contact angle can reach 99.6 DEG, the tensile strength can reach 5.96 MPa, the elongation at break can reach 128.0%, and the product is non-toxic, harmless and easy to degrade, and cannot cause environmental pollution and other problems.

Description

Technical field [0001] The invention belongs to the technical field of new food packaging, and specifically relates to a hydrophobic food preservation film applied to the field of food packaging and a preparation method thereof. Background technique [0002] The plastic products born with the development of industry are widely used in the fields of food packaging and preservation because of their rich sources, beautiful products, light weight, sanitation, convenient processing, low price, and stable properties. However, plastic packaging is not easy to decompose after use and will cause "white pollution". Some plastic packaging is prone to produce harmful gases and peculiar smells, which have a certain toxic effect on the human body. Therefore, seeking to replace plastic packaging materials is an important topic in "Packaging and the Environment". In the face of pollution and safety issues, all countries are striving to find a "green packaging" material. Among many "green packa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L5/06C08L5/08C08L67/00C08J5/18
CPCC08J5/18C08J2305/06C08J2305/08C08J2467/00
Inventor 费鹏
Owner MINNAN NORMAL UNIV
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