Preparation method and equipment of degradable environment-friendly packaging material for food contact

Abstract

The invention discloses a preparation method and equipment of a degradable environment-friendly packaging material for food contact. The preparation method comprises the following steps: S1, preparingalkylated nanocellulose; S2, preparing a chitosan solution; S3, preparing a gallic acid chitosan solution; S4, preparing a chitosan film; and S5, carrying out physical modification on the chitosan film. The equipment comprises a stirrer body. A supporting rod is fixedly installed at the position, close to one end, of the outer surface of the upper end of the stirrer body. A transverse plate is fixedly installed on the outer surface of the top end of the supporting rod. A movable groove is formed in the outer surface of the end, away from the supporting rod, of the transverse plate. By improving the formula, process and equipment, production can be completed by adopting one piece of integrated equipment, the integration degree is high, the occupied area is small, the equipment investment is small, and the cost is low. According to the invention, the light transmittance, tensile strength, elongation at break and natural degradation rate of the chitosan film can be improved, the equilibrium moisture absorption rate of the chitosan film can be reduced, and the water resistance of the chitosan film can be improved.

Description

technical field [0001] The invention relates to the technical field of degradable and environmentally friendly packaging materials, in particular to a method for preparing degradable and environmentally friendly packaging materials used for food contact; Background technique [0002] Food packaging materials are in direct contact with food. Whether the material is properly selected is related to food safety and people's health. Plastic has the advantages of light weight, durability, low cost and easy molding and processing. It has become the most popular packaging material at present. However, plastic packaging materials lack the value of recycling. After use, most of them are discarded in the environment, causing serious environmental pollution due to refractory degradation. Therefore, it is of great significance for sustainable development to prepare degradable and edible new packaging materials based on natural biodegradable substances. [0003] Chitosan is usually obtai...

AI Technical Summary

Problems solved by technology

[0004] However, compared with the currently widely used plastic packaging materials, the water blocking performance of chitosan film is poor, and the freshness preservation effect for packaged fruit foods is poor, reducing its application range.

At the same time, the existing preparation methods and equipment have a low degree of integration and require multiple pieces of equipment to be co-produced to complete, occupying a large area, requiring large equipment investment, and high cost

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