Degradable environment-friendly safe preservative film and preparation method thereof

Abstract

The invention discloses a degradable environment-friendly safe preservative film and a preparation method thereof. The formula comprises a PLA master batch, a PHA master batch, a PVA master batch, a plasticizer, a defoaming agent, an antibacterial agent, an antifogging agent and white oil. The invention discloses a plastic wrap, which is prepared from the following components in parts by weight: 70 to 80 parts of PLA master batch, 20 to 25 parts of PHA master batch, 10 to 20 parts of PVA master batch, 1 to 3 parts of plasticizer, 0.1 to 0.15 part of defoaming agent, 2 to 5 parts of antibacterial agent, 1 to 4 parts of antifogging agent and 0.1 to 0.3 part of white oil. The plastic wrap is non-toxic, odorless, safe and degradable, and is beneficial to reduction of white pollution and environmental protection; pVA and PHA are added in an auxiliary manner to produce the preservative film, the three raw materials are biodegradable, the problems of low melting point and low crystallinity of PLA are effectively improved, the overall quality of the preservative film is improved, meanwhile, the strength of the preservative film is enhanced, the number of bubbles in the raw materials is greatly reduced through addition of the defoaming agent and vacuumizing treatment, and the service life of the preservative film is prolonged. And the quality of the preservative film can be improved.

Description

technical field [0001] The invention relates to the technical field of preservative film processing, in particular to a degradable, environmentally friendly and safe preservative film and a preparation method thereof. Background technique [0002] Cling film is a kind of plastic packaging product, which is usually made of ethylene as the masterbatch through polymerization reaction. Cling film can be divided into three categories: the first is polyethylene, referred to as PE; the second is polyvinyl chloride, referred to as PVC ; The third is polyvinylidene chloride, referred to as PVDC. [0003] Nowadays, the mainstream cling film on the market is produced with PE, PVC and PVDC as raw materials. Although it is non-toxic and pollution-free, the cling film made is difficult to degrade and can only be disposed of in the form of centralized landfill or incineration. It is easy to cause white pollution and is not conducive to environmental protection. Nowadays, most of the degra...

AI Technical Summary

Problems solved by technology

[0003] Nowadays, the mainstream cling film on the market is produced with PE, PVC and PVDC as raw materials. Although it is non-toxic and pollution-free, the cling film made is difficult to degrade and can only be disposed of in the form of centralized landfill or incineration. It is easy to cause white pollution and is not conducive to environmental protection. Nowadays, most of the degradable plastic wraps are produced with PLA as raw material. Although they can be degraded, the plastic wraps produced with PLA as raw materials have low melting point and crystallinity, and their strength is poor, so they are easy to break , which reduces the quality of the product. At the same time, the uneven mixing of raw materials in the production process will cause the quality of the plastic wrap to vary, and the air bubbles in the raw materials cannot be completely removed during extrusion, which reduces the qualified rate of the product.

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