High-strength and heat-resistant polylactic acid material for 3D printing

Abstract

The present invention relates to a high-strength and heat-resistant polylactic acid material for 3D printing, wherein the components comprise, by mass, 100 parts of a L-polylactic acid resin, 1-20 parts of an inorganic filler, 0.01-5 parts of a polycarboxylic acid metal salt, 0.1-5 parts of an amide compound, 0.1-5 parts of a plasticizer, 0.1-1 part of an antioxidant, and 0.1-2 parts of an anti-hydrolyzing agent, wherein the molecular weight of the L-polylactic acid resin is 100000-400000, the anti-hydrolyzing agent is mixing at least one or more than two selected from a Polycarbodiimide compound, a single carbodiimide compound and a compound having an active group epoxy, the inorganic filler is a mixture formed from one or at least two selected from nanometer silica, talc powder, calcium sulfate crystal whisker and mica, and the diameter of the inorganic filler is 0.05-5 [mu]m. According to the present invention, the tensile strength achieves more than or equal to 60 MPa, the bending strength achieves more than or equal to 100 MPa, the Vicat softening temperature is more than or equal to 120 DEGC, the mechanical property and the heat resistance are substantially improved compared with the commonly used PLA, and the practicality and the application range of the PLA supplies are substantially improved.

Description

technical field [0001] The invention relates to the technical field of 3D printing materials, and relates to a high-strength and high-heat-resistant polylactic acid material for 3D printing. Background technique [0002] 3D printing technology, also known as additive manufacturing technology, is actually an emerging technology in the field of rapid prototyping. It is based on digital model files and uses bondable materials such as powdered metal or plastic. A technique for constructing objects in a manner. The basic principle is additive manufacturing, the technique of adding material layer by layer to generate a three-dimensional solid. FDM technology is the only professional 3D printing technology that uses production-grade thermoplastics as consumables. This process does not require lasers, and is easy to use and maintain, with low costs. At present, most desktop-level 3D printing equipment is manufactured using FDM technology. [0003] The principle of FDM technology ...

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Problems solved by technology

However, there is less data on the modification of polylactic acid for FDM 3D printing.

[0006] Chinese Patent Publication No. CN103146164A discloses a polylactic acid material for rapid prototyping nanomaterial toughening and a preparation method thereof. It improved the defect of poor toughness of polylactic acid, but the addition of polyacrylate microspheres caused the inhomogeneity of the polylactic acid system structure, and the processing performance was significantly reduced, which seriously affected the printing and molding of the product.

[0007] Chinese patent application publication number CN 103665802 A discloses a PLA material modification method that can be used for 3D printing. The method is to use inorganic nanomaterials as toughening agents to toughen and modify PLA. The method grinds polylactic acid through a planetary mill. And inorganic nano-powder, although it can enhance the dispersion of the powder in polylactic acid, but the processing efficiency is extremely low, so it cannot be used in industrial production

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