Biodegradable material for preservation box, preservation box and preparation method of preservation box

Abstract

The invention relates to the technical field of biodegradable polymer materials, in particular to a biodegradable material for a preservation box, the preservation box and a preparation method of thepreservation box. The biodegradable material is prepared from 25-40 parts of modified starch, 40-60 parts of polylactic acid, 5-15 parts of biodegradable aliphatic-aromatic copolyester, 5-15 parts ofmethyl hydroxypropyl cellulose ether, 5-10 parts of nano talc powder, 0.1-0.5 part of a chain extender and 0.2-0.8 part of zinc stearate. According to the biodegradable material for the preservation box, the preservation box and the preparation method of the preservation box, through the synergistic effect of all components, the cost is greatly reduced while improving the toughness, plasticity anddegradability of products, the amount of various additives in the raw materials is small, and the use amount of the modified starch is larger, so that the cost is reduced while improving the performance of the products, and it is conducive to large-scale production and application.

Description

technical field [0001] The invention relates to the technical field of biodegradable polymer materials, in particular to a biodegradable material used for a fresh-keeping box, a fresh-keeping box and a preparation method thereof. Background technique [0002] With the continuous development of my country's economy, the demand for packaging materials such as fresh-keeping boxes is also increasing. Traditional crisper materials are mainly derived from petroleum-based materials such as polypropylene (PP) and 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] Poly...

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

[0004] Therefore, the starch-modified polylactic acid materials of the prior art 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 during processing because the temperature is too high; (2) polylactic acid The compatibility with starch is not good enough, resulting in poor physical and mechanical properties such as toughness and plasticity of the material; (3) in order to improve the performance of the product, the existing technology can only add some high-cost additives, resulting in a large cost of the product Improve and reduce the degradable performance

Images