Preparation method of highly transparent air-permeable fresh-keeping film bag

Abstract

The invention discloses a high-transparency breathable fresh-keeping film bag and a preparation method thereof, and belongs to the field of packaging films. The fresh-keeping film bag is prepared fromthe following raw materials in parts by weight: 2-5 parts of polyvinyl alcohol, 1-2 parts of hemicellulose, 0.1-0.3 part of boric acid, 0.1-0.3 part of methyl propylene glycol, 1-2 parts of chitosan,3-5 parts of polyethylene glycol, 0.2-1 part of tributyl citrate, 1-2 parts of a silane coupling agent, 1-2 parts of microcrystalline cellulose, 22-80 parts of 95% ethanol and 90-360 parts of water.The fresh-keeping film bag prepared by the above components has good biodegradability, also has excellent comprehensive mechanical properties, is safe to human body and low in cost, can be widely applied to fruit and vegetable packaging bags and food packaging, and has good economical efficiency.

Description

technical field [0001] The invention relates to the field of fresh-keeping materials, in particular to packaging materials in the field of food fresh-keeping, especially a method for preparing a highly transparent and air-permeable fresh-keeping film bag. Background technique [0002] Fresh-keeping film and fresh-keeping bags are commonly used plastic packaging products for fresh-keeping foods. Now families can’t do without them. People seem to think that food is safe and reliable if they are used. It is difficult to make people feel at ease. For example, polyvinyl chloride, referred to as PVC, this material can also be used in food packaging, but it has a certain impact on the safety of the human body. PVC cling film contains carcinogens, which is more harmful to the human body; Although polypropylene cling film and polyethylene cling film are non-toxic, they are made of a single material, and have poor air permeability and short food preservation time. During the food stor...

AI Technical Summary

Problems solved by technology

[0009] According to the above, in the existing scheme, the transparency of the film in the air-permeable fresh-keeping film is relatively poor during use, and the appearance quality such as the shape, color and luster, and freshness of the food cannot be sensed and visually observed at the time of sale; in addition, the air-permeable fresh-keeping film is relatively small , the concentration ratio of oxygen and carbon dioxide in the plastic wrap bag cannot be effectively maintained, making the food shelf life shorter. In view of this, the present invention proposes a preparation method of a highly transparent and breathable plastic wrap bag, which can effectively solve the above technical problems