Degradable square-bottom bag and preparation method thereof

Abstract

The invention discloses a degradable square-bottom bag which is characterized by being prepared from the following raw materials in parts by weight: 10-20 parts of wheat straw paper pulp fibers, 10-50parts of purple sweet potato powder, 10-20 parts of tapioca flour, 30-50 parts of chitosan and 70-150 parts of bark fibers of Melaleuca leucadendron L. The degradable square-bottom bag comprises eight edges, a main body of the degradable square-bottom bag is mainly composed of a first layer of base material, a second layer of base material and a third layer of base material from outside to inside, the first layer of base material is a kraft paper, and the second layer of base material and the third layer of base material are both PLA. The invention further provides a preparation method of thedegradable square-bottom bag. The preparation method comprises the steps of base material forming, gelatinized liquid material polycondensation and drying treatment. According to the invention, sincethe wheat straw, the purple sweet potato powder and the cassava can be digested by microorganisms, the damage to the environment is reduced. By the combination of bark fibers of Melaleuca leucadendron L., toughness can be improved. In addition, animal and plant powder in the raw materials can also be used as fertilizer after being degraded, and is beneficial to land.

Description

technical field [0001] The invention relates to the technical field of packaging, in particular to a degradable bag, especially a degradable square bottom bag and a preparation method thereof. Background technique [0002] Plastic bags are bags made of plastic (commonly used plastics include polyethylene, polypropylene, polyester, nylon, etc.) as the main raw material. They are indispensable items in people's daily life and are often used to hold other items. thing. It is widely used because of its cheap, extremely light weight, large capacity, and easy storage. China's annual output of plastics is 30 million tons, and its consumption is more than 6 million tons. If plastic bags are calculated based on 15% of the annual plastic waste, the annual plastic waste in the world is 15 million tons, and the annual plastic waste in China is more than 1 million tons, and the proportion of waste plastics in garbage accounts for 40%. More of the discarded plastic is buried in the gro...

AI Technical Summary

Problems solved by technology

However, in the prior art, since waste plastics will produce harmful gases to the human body during incineration or reprocessing and pollute the environment, it can be said that the disposal of waste plastics is still a major problem in environmental protection work.

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