Biodegradable composite membrane and preparation method and application thereof

A technology of biodegradable and composite membranes, applied in the field of biodegradable composite membranes and its preparation, can solve the problems of non-recyclable, increased oil consumption, low mechanical strength, etc., achieve good toughness, prolong fresh-keeping time, and improve tolerance Effect

Inactive Publication Date: 2022-01-21
BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the food preservation film currently widely used in commerce is a polymeric plastic packaging film with good barrier properties, which is based on petroleum and prepared from vinyl masterbatches, such as polyethylene (PE) and polyvinylidene chloride (PVDC ), which not only increases the consumption of petroleum, but also is difficult to degrade and cannot be recycled, causing serious pollution to the environment
Moreover, the food preservation films currently used in the fields of fruit and vegetable preservation and food packaging usually have the problems of low mechanical strength and poor oxygen barrier properties.

Method used

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  • Biodegradable composite membrane and preparation method and application thereof
  • Biodegradable composite membrane and preparation method and application thereof
  • Biodegradable composite membrane and preparation method and application thereof

Examples

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preparation example Construction

[0036] In one aspect, the present invention also provides a method for preparing the biodegradable composite film described above, comprising the following steps:

[0037] Mix polyglycolic acid and polybutylene terephthalate-adipate, extrude, granulate, dry, and form a film.

[0038] In some embodiments, the particle size of extrusion granulation is not limited too much, for example, it can be 2mm, 2.5mm, 3mm and so on.

[0039] In some embodiments, the film forming method is blown film forming, and the temperature of blown film forming may be 190°C-240°C.

[0040] In some embodiments, a step of injection molding is also included prior to the drying step. The film-forming effect of blown film can be improved by increasing the steps of injection molding.

[0041] In some embodiments, the temperature of injection molding can be selected from the common temperature in the field, for example, it can be 240°C-260°C.

[0042] In some embodiments, the drying is vacuum drying, and ...

Embodiment 1

[0048] The PGA with a mass percentage of 80% and the PBAT with a mass percentage of 20% were uniformly mixed, extruded and granulated by a twin-screw extruder, wherein the feeding speed was 8g / min, the feeding method was automatic feeding, and the temperature was 240°C, the rotation speed is 30r / min, and the particle size is about 2mm. A standard sample strip with a size of 80mm×10mm×4mm was prepared by an injection molding machine at 240°C. Then the standard sample was vacuum-dried at 60°C for 2 hours, and then at 200°C, a biodegradable composite film with a thickness of about 50 μm was prepared using a film blowing machine.

Embodiment 2

[0050] The preparation method of this example is basically the same as that of Example 1, except that the mass percentages of PGA and PBAT are different. Specific steps are as follows:

[0051] The PGA with a mass percentage of 60% and the PBAT with a mass percentage of 40% were uniformly mixed, extruded and granulated by a twin-screw extruder, wherein the feeding speed was 8g / min, the feeding method was automatic feeding, and the temperature was 240°C, the rotation speed is 30r / min, and the particle size is about 2mm. A standard sample strip with a size of 80mm×10mm×4mm was prepared by an injection molding machine at 240°C. Then the standard sample was vacuum-dried at 60°C for 2 hours, and then at 200°C, a biodegradable composite film with a thickness of about 50 μm was prepared using a film blowing machine.

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Abstract

The invention relates to the technical field of composite membrane materials, in particular to a biodegradable composite membrane and a preparation method and application thereof. The biodegradable composite membrane comprises the following components in percentage by mass: 40%-80% of polyglycolic acid and 20%-60% of poly(terephthalate-butylene adipate) The biodegradable composite membrane can effectively reduce oxidase in a substance to be preserved, delays the content of antioxidant such as flavone, polyphenol and H2O2 and the reduction of the activity of the antioxidant enzyme, improves the oxidation resistance and the tolerance to active oxygen stress of the substance to be preserved, delays the period of browning of the substance to be preserved, ensures the appearance, the taste, the nutritional value and the processing performance, and prolonges the shelf life.

Description

technical field [0001] The invention relates to the technical field of composite membrane materials, in particular to a biodegradable composite membrane and its preparation method and application. Background technique [0002] Strawberry (Fragaria ananassa Duch.) belongs to the family Rosaceae. It is known as the "Queen of Fruits" because of its sweet and sour fruit, beautiful shape, soft and juicy, and strong aroma. However, due to the physiological characteristics of strawberry, such as high water content, fragile peel, soft tissue, and strong postharvest respiration, strawberry fruit is easily subject to mechanical damage such as bumping, extrusion, and collision, and microbial infection during picking, transportation, and sales. Rotten and rotten lose edible and commercial value, thereby restricting the development of its sales radius and production scale. Therefore, suitable post-harvest preservation methods play an important role in improving the economic value of str...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L67/02C08J5/18B65D65/46
CPCC08J5/18B65D65/466C08J2367/04C08J2467/02C08J2367/02C08J2467/04Y02W90/10
Inventor 翁云宣孙颖黄岩王星煜端宁
Owner BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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