Preparation method of high magnification full biodegradable foaming material

Abstract

The invention discloses a preparation method of a high magnification full biodegradable foaming material, a blend of full biodegradable material polylactic acid (PLA) and full biodegradable material poly (butyleneadipate-co-terephthalate) (PBAT) / dibutyl phthalate is prepared by an internal mixer, at the same time, an epoxy chain extender is added as a reaction compatilizer EC, an organic modification montmorillonoid (OMMT) is added as a nucleating agent, then the prepared material is placed into a high pressure foaming kettle, supercritical CO2 is injected as a foaming agent, and rapid depressurization is performed to obtain the product with high foaming ratio after long-time high pressure maintaining. With the preparation method, the polylactic acid foaming material with the foam density of 0.0155-0.0205 g / cm3 and the foaming ratio of 60-80 times can be obtained. The prepared polylactic acid foaming material is high in foaming ratio, full biodegradable, green and environment-friendly and capable of replacing most packaging undegradable foamed plastic in a wide range.

Description

technical field [0001] The invention relates to the field of polymer material processing, in particular to a preparation method of a high-magnification fully biodegradable foaming material. Background technique [0002] Energy shortage and environmental pollution are the key issues restricting the sustainable development of China's economy and society. Traditional foamed plastic substrates such as polystyrene, polyurethane, etc., because of their poor mechanical properties and physical properties, or are thermosetting plastics, cannot be easily recycled, so that many applications are greatly restricted, and the pollution to the environment is relatively high. serious. With the increasing calls for global environmental protection and the promotion of sustainable development strategies, the concept of green has gradually become popular. Polylactic acid (PLA) has three characteristics that are different from other thermoplastic polymer materials, namely, it comes from renewabl...

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Problems solved by technology

[0003] However, the melt strength of polylactic acid resin is low, it is difficult to obtain foamed products with stable shape, and it is also difficult to obtain high expansion ratio

There are still technical difficulties in preparing polylactic acid foam materials with excellent performance through commercialized general-purpose polylactic acid resins

Since 2006, large international companies in Japan, the Netherlands, the United States and other countries have successfully realized the commercialization of polylactic acid foaming materials through new polylactic acid synthesis processes or through the modification of general-purpose polylactic acid resins, but still have not achieved comparative results. High expansion ratio

However, PLA and PBAT are incompatible, and there is obvious phase separation.

[0005] In the Chinese patent CN200910184047, it is disclosed that PBAT is used as a toughening agent to improve the elongation at break and impact resistance of PLA, but the foaming agent is a chemical foaming agent, which is difficult to obtain a higher foaming ratio; China In the patent CN2010231424, it is also disclosed that PBAT is used as a toughening modifier to blend with PLA to prepare polylactic acid foaming materials, supercritical CO 2 As a foaming agent, although it also realizes the full biodegradability of polylactic acid foaming, it does not take into account the incompatibility of the two materials PLA and PBAT, nor does it obtain a higher foaming ratio; Chinese patent In CN201010502180, it is disclosed that the use of fully biodegradable materials cornstarch, polyethylene glycol and coupling agent is used as polylactic acid additives. Although the high toughness of polylactic acid materials has also been realized, it does not involve its foaming effect

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