Pectin preservative film and preparation method thereof

Abstract

The invention discloses a pectin preservative film and a preparation method thereof. The pectin preservative film comprises the following components in parts by mass: 8-15 parts of pectin, 3-6 parts of polyvinyl alcohol, 0.5-0.8 part of adhesive, 0.8-1.3 parts of glycerol, 0.05-0.1 part of sodium hydroxide and 70-80 parts of water. The adhesive is gelatin or agar. The preparation method comprises the following steps: dissolving the pectin in water, adding the sodium hydroxide to regulate the pH value to 7-8, heating to 80-90 DEG C, stirring until the pectin is completely dissolved, adding the polyvinyl alcohol, adhesive and glycerol, stirring to obtain a viscous sol, pouring the sol into a double screw extruder, carrying out extrusion plastifying, and carrying out film blowing. The widely existent pectin used as the main film-forming material is degradable and can not cause environmental pollution; and the prepared preservative film has the advantages of uniform thickness, equivalent tensile strength and elongation at break to the commercially available common PE (polyethylene) film, and higher light transmittance, and can be used as a substitute of the common PE film.

Description

technical field [0001] The invention belongs to the technical field of packaging materials, and in particular relates to a pectin fresh-keeping film and a preparation method thereof. Background technique [0002] As a new type of hygienic packaging product, food preservation film is becoming more and more popular in the family. It plays a certain role in preventing the odor of various dishes in the refrigerator and maintaining the freshness of the dishes. At present, in the process of food preservation film processing, in order to improve the product application performance, often add a variety of processing aids, including plasticizers, stabilizers, antibacterial agents, crosslinking agents, etc., the prepared plastic preservation film is difficult to degrade, which brings Great environmental hazard. [0003] At present, the raw materials used in most packaging materials are petrochemical polymers, which have the advantages of low production cost and good product perfo...

AI Technical Summary

Problems solved by technology

But its disadvantage is that the raw materials are not renewable, and the packaging materials cannot be quickly and effectively degraded in the environment after being used and discarded. If no special measures are taken, they can remain in the environment for a long time and cannot be consumed, causing huge pressure on the ecological environment. , to develop a new type of plastic wrap packaging material to replace the traditional petrochemical plastic wrap, which can improve biodegradability and solve the environmental crisis

Fruit peels usually contain a lot of pectin substances, and fruit peels are basically treated as waste, resulting in a great waste of pectin raw materials. If they can be used, they will not only turn waste into treasure but also contribute to environmental protection