Chitosan composite preservative film and preparation process thereof

Abstract

The invention discloses a chitosan composite preservative film and a preparation process thereof. Chitosan is used as the main component of the preservative film. The preservative film comprises the following components in parts by weight: 100 parts of the chitosan, 3,000-4,000 parts of 1% acetic acid solution, 1-5 parts of sodium trimetaphosphate, 30-50 parts of silica sol, 100-200 parts of glycerol, and 2-10 parts of oleic acid. By being improved through chemical and physical blending modification, the prepared preservative film has the advantages of being good in extensibility, flexibility, transparency, oxygen permeating coefficient and moisture permeability and the like; the preservative film disclosed by the invention has good biocompatibility with organisms; enzymatic degradation, oxidative degradation and acid degradation can be carried out under a certain condition; the final degradation products are oligomers, such as dimeric glucan, trimerical glucan and the like; the residual toxicily problem does not exist; and the preservative film has strong practicability in terms of fruit and vegetable freshness.

Description

technical field [0001] The invention relates to a plastic film, in particular to a fresh-keeping film for keeping fruits and vegetables fresh and a manufacturing process thereof. Background technique [0002] At present, there are mainly two kinds of plastic wraps used for fresh-keeping of fruits and vegetables on the market, one is PE film and the other is PVC, but because PVC film contains plasticizer-dioctyl adipate (DEHA), DEHA Excessive plasticizer migrates into food, which is easy to cause cancer after eating and seriously endangers human health. It has been banned and replaced by PE plastic wrap. [0003] However, since these two kinds of plastic wraps are petroleum products, they cannot be degraded by themselves, causing environmental pollution. In addition, some monomers (such as VCM, recycled polyethylene), additives (such as plasticizers, such as oils) Acid amide) will migrate to the packaged food, bringing certain toxic and side effects to the human body, and th...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the deficiencies in the prior art that the PE fresh-keeping film is not easy to degrade and the fresh-keeping effect is not good, the present i

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