PHA/PLA blended alloy and its preparation method

Abstract

The invention discloses a PHA / PLA (polylactic acid / polyhydroxyalkanoate) blended alloy, which is added with a filling material. The alloy is characterized by comprising 60-80 parts of PHA, 10-40 parts of PLA, and 10-25 parts of the filling material. The blended alloy disclosed in the invention has both toughness and rigidity, and also has good thermostability and fluidity.

Description

technical field [0001] The invention relates to the field of materials, more particularly, to a completely biodegradable PHA / PLA blended gold and a preparation method thereof. Background technique [0002] The traditional plastic industry consumes a lot of petroleum energy and brings about "white pollution", which has attracted more and more attention. Since the 1960s and 1970s, people have begun to research and develop biodegradable plastics. A variety of biodegradable materials have come out. After biodegradable materials are biodegraded, they become water and carbon dioxide, which will not cause harm to the environment. At present, more researches on biodegradable plastics focus on polylactic acid (PLA), polyhydroxyalkanoate (PHA) and so on. [0003] Polyhydroxyalkanoate (PHA) is a kind of high molecular polyester synthesized by microorganisms, and its molecular weight is generally between tens of thousands to several million, and it exists widely in various microorganis...

AI Technical Summary

Problems solved by technology

Moreover, pure polylactic acid is very brittle, its low elongation at break (only 6%) and high modules hinder its application in many aspects. If it is to be processed into plastic film, the most widely used disposable packaging material It can only be formed by biaxial stretching method, and a suitable plasticizing system must be added to the conventional blow molding method, and the addition of a plasticizing system cannot affect the biodegradable performance. Due to too much brittleness, PLA is also difficult Injection molding products with good quality and complex shapes on ordinary injection molding machines

[0006] Generally speaking, PLA can be degraded, but its processing performance is poor, and it is difficult to process products with composite use requirements on conventional polymer processing equipment through conventional processing methods

In order to expand its application field, most of the modification methods are currently used to improve its processing performance, mainly including: (1) copolymerization modification, copolymerization with other hydrophilic substances, industrial complexity; (2) blending modification, with other hydrophilic substances Blending of biodegradable materials, the industry is simple and easy to operate; (3) Composite modification, using PLA as the matrix and compounding with other materials to improve the brittleness of PLA, can form more complex shapes, but most of them cannot be formed by traditional plastic processing machinery. Applications are limited

[0007] Disclosed some PHA and PLA blend materials at present, although the blend that the above-mentioned disclosed technology manufactures has certain toughness, its rigidity is insufficient, mainly can only be used on plastic packaging material such as film, in such as injection molding products such as cosmetics Bottles, fresh-keeping boxes, display casings, etc., as well as construction panels with high rigidity requirements, have great limitations, and their performance is not ideal.