Preparation method of conductive polylactic acid composite for thermal fusion 3D printing

Abstract

The invention discloses a preparation method of a conductive polylactic acid composite for thermal fusion 3D printing. The method includes the steps that polylactic acid is dissolved in dichloroethane with the mass concentration of 5%; carbon nanotubes are added, and the mixture is evenly stirred; a coupling agent is added, and the mixture is stirred for 30 minutes-1 hour under the effect of ultrasonic waves; the dichloroethane is evaporated, and residua are dried to be sheets in a vacuum drying oven, then cooled and smashed; smashed products are weighed according to a set formula proportion to serve as formula components and added into a high-speed mixer to be mixed for 1 minute at a high speed; the mixture is added into a screw extruder to be subjected to fusion mixing, then cooled in a water tank and drawn to be strips with the diameter phi of 1.75 mm+ / -0.2 mm, and the conductive polylactic acid composite is obtained. The composite has high fluidity, rapid crystallization performance and high tenacity and is low in shrinkage rate, high in printing precision and suitable for fused deposition 3D printing rapid prototyping.

Description

technical field [0001] The invention relates to the technical field of polymer composite materials, in particular to a method for preparing a conductive polylactic acid composite material composition for hot-melt 3D printing. Background technique [0002] In recent years, rapid prototyping 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 ecol...

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 composite technology of polymer materials is becoming more and more mature, and a variety of modified and composite materials of polylactic acid have been developed, but there are no reports of polylactic acid composite materials with conductive properties suitable for 3D printing. Therefore, it is urgent to develop and industrialize

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