Biodegradable material containing aliphatic polycarbonate, and preparation method and application thereof

Abstract

The invention relates to a biodegradable material containing aliphatic polycarbonate, and a preparation method and an application thereof. The biodegradable material is obtained by the following steps of mixing 20-90 parts by weight of aliphatic polycarbonate, 10-80 parts by weight of aliphatic polyester, 0.01-1 part by weight of an organic peroxide, 0.05-1 part by weight of a cross-linking agent, 3-15 parts by weight of a compatilizer, 0.3-5 parts by weight of a plasticizer, 0.1-5 parts by weight of a heat stabilizer and 0.01-1 part by weight of an auxiliary agent uniformly; adding the above mixture in a double-screw extruder for melt blending, stretching the blended mixture into strips; pelletizing the strips to obtain granular mixing resin slices; and vacuum drying the slices and removing water from the slices. The biodegradable material can be used for preparing completely biodegradable film which has various excellent performances of conventional films, can keep relatively good transparency, has relatively high tensile strength, can provide high toughness and tearing strength, and has good thermal stability, etc.

Description

technical field [0001] The invention relates to the field of biodegradable materials, in particular to a biodegradable material containing aliphatic polycarbonate, a preparation method thereof, and an application of the biodegradable material in preparing a biodegradable film. Background technique [0002] In order to solve the "white pollution" problem caused by plastic products, the use of environmentally friendly and fully biodegradable polymers to replace traditional petroleum-based plastics has become a current research and development hotspot. [0003] Aliphatic polycarbonate is a new class of completely biodegradable and surface-erodible materials with good mechanical processing properties. The improvement of its performance can make the aliphatic polycarbonate have a wide range of physical, chemical and biological properties, and can be well applied in disposable packaging materials, medical materials, mulching films, etc. [0004] Aliphatic polycarbonate is current...

AI Technical Summary

Problems solved by technology

[0004] Aliphatic polycarbonate is currently researched more polypropylene carbonate is prepared by carbon dioxide / epoxy regulation copolymerization method, but due to the limitation of the specific structure of epoxy (mostly limited to propylene oxide) prepared polypropylene carbonate Propylene carbonate is amorphous, and the glass transition temperature and thermal decomposition temperature are low, which seriously affects the processing performance, thermal stability and mechanical properties of this type of polycarbonate

Chinese patents CN 101402789 and CN 101857718 disclose methods for preparing biodegradable films by blending blow molding of polypropylene carbonate, polybutylene succinate, polyadipate / butylene succinate copolyester, etc. However, the tear strength of the film produced by this method is not high, the tensile strength is low, the processing temperature is low, and the transparency of the film is not high.

Chinese patent CN 101348606 discloses a method for preparing a biodegradable film by blending polypropylene carbonate and polylactic acid, dissolving it with a large amount of solvent, and volatilizing at room temperature to lay a film. The first method consumes a large amount of solvent and pollutes the environment. The performance of the prepared thin film is not high, and the main reason is that this method cannot realize large-scale practical production application

Because polybutylene carbonate is a polymer with a linear structure, and its glass transition temperature and melt strength are still low, it still has low melt strength and poor compatibility when forming composite materials. Not very stable in blown film or foaming process

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