Polyhydroxylkanoates as well as blending modification for copolymer thereof and polylactic acid

Abstract

The invention discloses a PHBV with good performance and a copolymer of PHBV and PLA and the preparation technique method. The invention is characterized in that 1 per cent to 99 per cent of PHAs, 1 per cent to 99 per cent of PLA1 and other additives 0-40 per cent are put in a mixer for 1 to 30 minutes, and then put in an electricity hot blast drying oven a temperature ranging from 40 to 100 DEG C for 2 to 48 hours after being mixed equally. The dried compound is plastified in a double screw extruder, the highest temperature of the double screw extruder is between 90 and 180 DEG C according to the the different content of PHAs and the temperature of the mouth mold is between110 to 170 DEG C. The material extruded from a die head is cooled, stretched and grained to form the complete biodegradation aggregate. The resin consisting of PHBV and copolymer of PHBV and PLA is able to be used for producing the thin films, plates and sheet materials and injected mold to plastic materials. The compound has biological degradability and good machining performance. The target product of the compound has excellent mechanical properties and can be used for replacing the petroleum base plastic to be widely used for packing, agriculture, medical material, electron, chemical industry concerning products for daily use, etc.

Description

technical field [0001] The invention relates to a method for modifying a fully biodegradable polymer material, more specifically, relates to a modification method by blending PHAs and PLA to improve the processing performance and service performance of the two degradable materials. Background technique [0002] With the continuous growth of human demand for energy and the increasing emphasis on environmental protection, on the other hand, the traditional plastic industry consumes a large amount of petroleum energy and the "white pollution" it brings has attracted more and more attention. Since the 1960s and 1970s, people have started the research and development of degradable plastics. With the continuous efforts of many scientists at home and abroad, and with the continuous advancement of technology, a variety of biodegradable materials have come out and are being further improved. Biodegradable plastic degrades into water and carbon dioxide, so it does not harm the enviro...

AI Technical Summary

Problems solved by technology

[0016] The purpose of the present invention is to provide a kind of good performance polyhydroxyalkanoate and its copolymer and the preparation method of polylactic acid blend, play the effect of plasticizer to PLA, solve existing PLA toughness and tear resistance Insufficient cracking performance, low elongation at break, brittle film and lack of toughness, etc., improve the processing performance of PHAs, so that they can be produced at an industrial rate using traditional equipment, that is, blending and modifying PHAs and PLA, by controlling the PHAs in The content in the blend and the toughness of PHAs to change the physical and mechanical properties and processing properties of the blend, and at the same time the performance of the product made of the blend is also changed, so that this blend can be used on conventional plastic processing machinery It is used in various traditional plastic processing techniques such as injection molding, blow molding, extrusion, casting, biaxial stretching and melt spinning at industrial production rates. The product performance can meet the requirements of use, and the introduction of fully biodegradable PHAs increases the PLA biodegradability, and finally obtain a fully biodegradable polymer with excellent performance