Preparation method of polylactic acid composite material for hot-melt 3D printing

Abstract

The invention discloses a preparation method of a polylactic acid composite material for hot-melt 3D printing. The preparation method comprises the following steps: mixing set raw materials in a high-speed mixer according to formula proportions, wherein the raw materials comprise the following components in percentage by mass: 45-75% of polylactic acid, 10-40% of polyethylene, 5-10% of ethylene-vinyl acetate copolymer (EVA), 1-5% of a compatilizer, 0.3-0.6% of an antioxidant, 1-5% of a toughening agent, 0.5-2% of a lubricating agent, 0.1-1% of a nucleating agent and 0.5-2% of a plasticizer; adding the mixture into a screw extruder to perform melting mixing, and cooling in a water tank; and drawing the cooled composite material into slivers with the diameter phi of 1.75+ / 0.2mm. The composite material has high fluidity, fast crystallinity and high toughness, has the characteristics of low shrinkage ratio and high printing accuracy, and is suitable for rapid prototyping of melt deposition 3D printing.

Description

technical field [0001] The invention relates to the technical field of polymer composite materials, in particular to a method for preparing polylactic acid composite materials for hot-melt 3D printing. Background technique [0002] In recent years, rapid prototyping technology has been greatly developed, among which three-dimensional (3D) printing technology has become increasingly mature and industrialized, and has been gradually popularized and applied in fields such as bioengineering, aerospace, architecture, and design. There are several types of 3D printing, the simplest and lowest cost is plastic thermal fusion deposition printing, using plastic filaments, heating at the cavity and nozzle, quickly melting the plastic into liquid, and then printing 3D products layer by layer. The most commonly used plastics are ABS, nylon, polylactic acid, etc. [0003] Polylactic acid is a fully biodegradable plastic polymerized by lactic acid. It is a complete green ecological biopla...

AI Technical Summary

Problems solved by technology

However, polylactic acid itself has poor toughness, slow crystallization speed, and low heat resistance, which limit its application in some fields, so it often needs to be modified and compounded.

With the rapid development of the plastics industry, the modification and compounding technology of polymer materials are becoming more and more mature, and a variety of polylactic acid modification and compounding materials have been developed, but there is a lack of high-toughness polylactic acid compounding suitable for 3D printing in the prior art. materials, so there is an urgent need for development and industrialization

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