Biodegradable preservative film and preparation method thereof

Abstract

The invention relates to the technical field of biodegradable polymeric materials, in particular to a biodegradable preservative film and a preparation method thereof. The biodegradable preservative film is mainly prepared from the following raw materials in parts by weight: 50-65 parts of PBAT, 15-30 parts of modified starch, 20-40 parts of polylactic acid, 3-10 parts of a biodegradable aliphatic-aromatic copolyester, 3-10 parts of hydroxypropyl methyl cellulose ether, 2-8 parts of nano talcum powder, 0.1-0.5 part of a chain extender, 0.2-0.8 part of an antioxidant, and 0.2-0.6 part of a lubricant. Through the synergistic effect of all the components, the cost is lowered greatly while tenacity, plasticity, strength and degradability of a preservative film product are improved, and thus scale production and application are facilitated.

Description

technical field [0001] The invention relates to the technical field of biodegradable polymer materials, in particular to a biodegradable plastic wrap and a preparation method thereof. Background technique [0002] With the continuous development of my country's economy, the demand for packaging materials such as plastic wrap is also increasing. Traditional cling film materials are mainly derived from petroleum-based materials such as polyethylene (PE), which are difficult to dispose of after they are discarded. If it is disposed of by incineration, a large amount of toxic by-products will be produced; if it is disposed of by landfill, the degradation cycle of traditional petroleum-based materials is very long, and some even exceed 100 years, which will bring serious "white pollution" "question. Therefore, environmentally friendly biodegradable materials are currently a research hotspot. [0003] Polylactic acid (PLA), a thermoplastic biodegradable material with high stren...

AI Technical Summary

Problems solved by technology

For example, Chinese patent CN102408690A discloses a thermoplastic starch-modified polylactic acid material, which forms a blend system of starch and polylactic acid through simple direct blending, but the starch and polylactic acid are incompatible, and the interfacial cohesion of the blend system is poor. The physical and mechanical properties such as toughness and plasticity of the product are reduced; Chinese patent CN101831155A discloses a method for preparing a starch / polylactic acid blend. application in food packaging and tableware; and for example, Chinese patent CN101781448A discloses a preparation method of a fully biodegradable reinforced polylactic acid / starch blend, which improves the blend by adding a thermoplastic elastic toughening agent. Mechanical and heat resistance properties, but the thermoplastic elastic toughening agent used is liquid rubber or thermoplastic elastomer, which is a non-biodegradable component, which affects the complete degradability of the blend

Therefore, the current starch-modified polylactic acid materials still have the following defects: (1) the heat-resistant temperature of the starch itself is limited, so that the starch will be carbonized and decomposed due to excessive temperature during processing; (2) polylactic acid and starch The compatibility of the material is not good enough, resulting in poor physical and mechanical properties such as toughness, strength and plasticity of the material.

For this reason, most of the existing technologies improve the performance of the product by adding various high-cost additives, which will greatly increase the cost of the product and reduce the degradable performance of the material; Antibacterial performance of plastic wrap, that is, coating a layer of antibacterial coating on the formed film, and then curing

Although the process is simple in this way, the antibacterial performance of the coating will decrease with the change of environment and the passage of time, and the antibacterial period is short

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