Preparation method of hydrophobic starch food packaging film

A starch food and packaging film technology, applied in textiles and papermaking, liquid repellent fibers, fiber treatment, etc., can solve the problems of poor water blocking performance of starch films, and achieve the improvement of water blocking performance, film performance, and reaction. mild effect

Pending Publication Date: 2021-06-22
WUHAN POLYTECHNIC UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the starch film has the disadvantage of poor water blocking performance.

Method used

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  • Preparation method of hydrophobic starch food packaging film
  • Preparation method of hydrophobic starch food packaging film
  • Preparation method of hydrophobic starch food packaging film

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preparation example Construction

[0038] In view of this, the present invention proposes a method for preparing a hydrophobic starch food packaging film. The preparation method of described hydrophobic starch food packaging film comprises the following steps:

[0039] Step S10, dissolving starch in an aqueous dimethyl sulfoxide solution to form a spinning solution.

[0040] In this embodiment, starch is added to an aqueous solution of dimethyl sulfoxide, stirred to dissolve to form a solution, and then left to defoam to obtain a spinning solution. Specifically, in order to ensure that the starch is fully dissolved, in this embodiment, the starch is added to the aqueous solution of dimethyl sulfoxide, and stirred at 65°C to 75°C to dissolve the starch; wherein, the aqueous solution of dimethyl sulfoxide The concentration is 90% to 97%. In addition, in order to ensure smooth formation of fiber network structure during subsequent electrospinning, the mass fraction of starch in the spinning solution is 20%-30%. ...

Embodiment 1

[0052] Accurately weigh 2.0 g of starch and add it to 10 mL of 95% dimethyl sulfoxide aqueous solution, stir magnetically at 70° C. to obtain a 20% (w / v) starch solution, stand at room temperature for defoaming, and obtain a spinning solution.

[0053] The spinning parameters are set as follows: the spinning ambient temperature is 60°C, the electrostatic field voltage is 20kV, the spinning distance is about 15cm, and the spinning solution flow rate is 1 mL / h. Starch nanofibrous membranes were prepared by electrospinning.

[0054] Soak the prepared starch nanofiber film in ethanol solution with a concentration of 0.1 mol / L stearic acid, react at 60°C for 1 hour, take it out, wash it with absolute ethanol, and dry it at room temperature to obtain a hydrophobic starch food packaging film.

Embodiment 2

[0056] Accurately weigh 2.5 g of starch and add it to 10 mL of 95% dimethyl sulfoxide aqueous solution, stir magnetically at 70° C. to obtain a 25% (w / v) starch solution, stand at room temperature for defoaming, and obtain a spinning solution.

[0057] The spinning parameters are set as follows: the spinning ambient temperature is 60°C, the electrostatic field voltage is 20kV, the spinning distance is about 15cm, and the spinning solution flow rate is 1 mL / h. Starch nanofibrous membranes were prepared by electrospinning.

[0058] Soak the prepared starch nanofiber film in ethanol solution with a concentration of 0.1 mol / L stearic acid, react at 60°C for 1 hour, take it out, wash it with absolute ethanol, and dry it at room temperature to obtain a hydrophobic starch food packaging film.

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Abstract

The invention discloses a preparation method of a hydrophobic starch food packaging film. The preparation method of the hydrophobic starch food packaging film comprises the following steps: dissolving starch in a dimethyl sulfoxide aqueous solution to form a spinning solution; performing electrostatic spinning on the spinning solution to prepare a starch nanofiber membrane; performing stearic acid modification on the starch nanofiber membrane to form a bionic hydrophobic coating on the surface of the membrane, and reacting to obtain the hydrophobic starch food packaging film. The starch nanofiber membrane is prepared by using an electrostatic spinning method, so that the operation is simple, the reaction is mild, the prepared nanofiber membrane has a smoother and more uniform fiber network compared with a common starch membrane, the membrane performance is improved, more reaction sites are provided for subsequent stearic acid modification, and the hydrophobicity is favorably improved; and the starch nanofiber membrane is stearic, so that a barrier is formed on the surface of the starch nanofiber membrane, water permeation is avoided, and the water blocking performance of the food packaging film is improved.

Description

technical field [0001] The invention relates to the technical field of food packaging, in particular to a method for preparing a hydrophobic starch food packaging film. Background technique [0002] Food packaging films are mainly based on petroleum-based plastic packaging films, such as polyethylene (PE) and polyvinylidene chloride (PVDC). Plastic is one of the most widely used materials in food packaging. Although it has good mechanical properties and sealing properties, it is difficult to biodegrade and easily causes white pollution. With the continuous enhancement of people's awareness of environmental protection, the development of green and natural food packaging films has become a research hotspot. [0003] In recent years, some degradable natural renewable resources, such as starch, chitosan, cellulose, protein, etc., have attracted extensive research interest. Among them, starch has the advantages of wide sources, large reserves, and low price. It is expected to b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M13/188D04H1/728D06M101/04
CPCD06M13/188D04H1/728D06M2101/04D06M2200/12
Inventor 蔡杰程水源
Owner WUHAN POLYTECHNIC UNIVERSITY
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