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Production technology of environment-friendly food packaging film with accelerated freezing function

A technology of food packaging film and production technology, which is applied in the field of food packaging materials, can solve the problem of single function of film materials, and achieve the effect of reducing supercooling temperature

Active Publication Date: 2022-02-08
NANJING AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The patent (publication number CN211280029U, published on August 18, 2020) discloses "a degradable plastic film", which uses a high-strength starch composite film, a light-gathering film, a heat-stable film and an antibacterial layer to prepare a degradable plastic film. Degradable plastic film, but the film material has a single function

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] According to known methods, wheat bran is mixed with a mixture of 1.5M NaOH and 2.0M urea after inactivating enzymes, pulverizing, destarching and deproteinizing to prepare a mixed solution with a mass volume concentration of 5%. Stir for 8-12 hours, after the reaction, centrifuge at 5000rpm for 10min to take the supernatant; add absolute ethanol to the solution until the volume concentration is 40%, centrifuge at 8000rpm for 20min to take the supernatant, continue to add absolute ethanol until the volume concentration reaches 50% , repeat the centrifugation process to obtain a polysaccharide precipitate at a volume concentration of 50% ethanol; resuspend the precipitate with pure water, dialyze at 4°C for 48 to 72 hours, freeze-dry the resulting solution, and obtain AX with a concentration of 50% alcohol precipitation; Dissolve in dimethyl sulfoxide to make a solution with a mass volume concentration of 4%; adjust the pH of the solution to 8.5 with triethylamine, and sl...

Embodiment 2

[0023]The extraction process of wheat bran AX is the same as in Example 1, the concentration of alcohol precipitation is 30%; the pH of the triethylamine solution is adjusted to 8.0, the molar ratio of AX to OSA is 2, and the processes of centrifugation, precipitation, washing and drying coal are the same as in Example 1; The modified AX is prepared as a solution with a mass volume concentration of 2%, and the degassing, film casting, and drying processes are the same as in Example 1; the soaking of AX is the same as in Example 1, adding a trichlorovinylsilane solution with a volume concentration of 0.06%, Reaction, rinsing, and drying process are the same as in Example 1; the light-controlled reaction process of AX base film and butanethiol is the same as in Example 1, and the ultraviolet treatment condition is 300W power irradiation 4min, and the rinsing and drying process is the same as in Example 1; 10nm α-Al 2 o 3 The particles are mixed with 50mL hexane to make a soluti...

Embodiment 3

[0025] The extraction process of wheat bran AX is the same as in Example 1, and the alcohol precipitation concentration is 70%; the pH of the triethylamine solution is adjusted to 9.0, and the molar ratio of AX to OSA is 12, and the process of centrifugation, precipitation, washing and drying is the same as in Example 1; Modified AX is prepared as a solution with a mass volume concentration of 4%, and the degassing, film casting, and drying processes are the same as in Example 1; the soaking of AX is the same as in Example 1, adding a solution of trichlorovinylsilane with a volume concentration of 0.12%, and reacting , washing and drying process are the same as in Example 1; the light-controlled reaction process of AX base film and butanethiol is the same as in Example 1, and the ultraviolet treatment condition is 500W power irradiation 7min, and the washing and drying process is the same as in Example 1; the particle diameter is 30nm α-Al 2 o 3 The particles are mixed with 5...

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PUM

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Abstract

The invention relates to a production technology of an environment-friendly food packaging film with an accelerated freezing function, and belongs to the field of food packaging materials. The preparation technology is characterized by comprising the following steps of: by taking wheat bran as a main raw material, performing araboxylan (AX) extraction, modification and membrane casting to obtain an AX base membrane; and achieving surface functionalization of the film through light-operated hydrophobic modification and fixation of an ice nucleating agent to obtain an environment-friendly food packaging film with an accelerated freezing function. The packaging film produced by the invention has the functions of anti-icing and anti-fouling, freezing acceleration and degradability, and can be applied to frozen foods as a packaging material.

Description

1. Technical field [0001] The invention relates to an environment-friendly food packaging film production technology with accelerated freezing function, which belongs to the field of food packaging materials. 2. Background technology [0002] Plastic film materials have good packaging performance and low manufacturing cost. At present, they are still the most widely used and used food packaging materials. However, the refractory characteristics of plastics have caused great pressure on the ecological environment. Degradable biopolymers have good application prospects in packaging materials, among which polysaccharides, as a representative bio-based material, have excellent degradability. However, the membrane materials prepared by polysaccharide polymers have strong hydrophilicity and poor mechanical properties. Although the mechanical properties have been improved to some extent after adding plasticizers, the hydrophilicity of the membranes has increased, making it difficul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/12C08J7/04C08L5/14C09D183/04C09D7/61
CPCC08J7/12C08J7/0427C09D183/04C09D7/61C08J2305/14C08J2483/04C08K2003/2227Y02W90/10
Inventor 王沛王光正顾振新杨润强姜东
Owner NANJING AGRICULTURAL UNIVERSITY
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