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Composite polylactic acid material for 3D printing and preparation method thereof

A polylactic acid material, 3D printing technology, applied in the direction of additive processing, etc., to achieve the effect of improving crystallization speed and heat resistance, easy industrialization, and low production cost

Active Publication Date: 2016-10-26
山西阳宸中北科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there is no relevant report on 3D printing materials of polylactic acid toughened by hydroxyalkanoate copolymers

Method used

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  • Composite polylactic acid material for 3D printing and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] In terms of parts by mass, weigh 49 parts of PLLA, 49 parts of PDLA, and 2 parts of uracil after drying in a vacuum oven at 70°C for 10 hours, pre-mix with a high-speed mixer at a speed of 800 rpm for 6 minutes, and extrude with a twin-screw The polylactic acid blended particles are obtained by melting and extruding with a machine, cooling in a water tank, and cutting into pellets by a pelletizer. The five-stage heating temperature of the barrel of the twin-screw extruder was set to 180, 190, 200, 210, and 215°C respectively, the temperature of the head was set to 220°C, and the screw speed was 60rpm.

[0032] Weigh 80 parts of the above polylactic acid blend particles, 5 parts of polyethylene glycol and 15 parts of poly(3-hydroxybutyrate-co-4-hydroxybutyrate) (4-hydroxybutyrate content 20mol%, weight average Molecular weight: 540,000 g / mol), pre-mixed by a high-speed mixer, melt-blended with a single-screw extruder, drawn and processed into a 3D printing filament with ...

Embodiment 2

[0035] In terms of parts by mass, weigh 33 parts of PLLA, 66 parts of PDLA, and 1 part of 6-aminouracil after drying in a vacuum oven at 60°C for 12 hours. The screw extruder is melted and extruded, and after the water tank is cooled, the polylactic acid blended pellets are obtained by pelletizing with a pelletizer. The five-stage heating temperature of the barrel of the twin-screw extruder was set to 170, 180, 190, 200, and 205°C respectively, the temperature of the head was set to 210°C, and the screw speed was 100rpm.

[0036] Weigh 70 parts of the above polylactic acid blend particles, 10 parts of polyethylene glycol and 20 parts of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (3-hydroxyvalerate content 5mol%, weight average Molecular weight: 610,000 g / mol), pre-mixed by a high-speed mixer, melt-blended with a single-screw extruder, drawn and processed into a 3D printing filament with a diameter of 1.75mm. The five-stage heating temperatures of the barrel of the single-sc...

Embodiment 3

[0039] In terms of parts by mass, weigh 66 parts of PLLA, 33.5 parts of PDLA, and 0.5 part of 6-carboxyuracil after drying in a vacuum oven at 80°C for 4 hours, and pre-mix them with a high-speed mixer at a speed of 1000 rpm for 5 minutes. The screw extruder is melted and extruded, and after the water tank is cooled, the polylactic acid blended pellets are obtained by pelletizing with a pelletizer. The five-stage heating temperature of the barrel of the twin-screw extruder was set to 190, 200, 210, 220, and 225° C. respectively, the temperature of the head was set to 230° C., and the screw speed was 30 rpm.

[0040] Weigh 60 parts of the above polylactic acid blend particles, 10 parts of polyethylene glycol and 30 parts of poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (3-hydroxyhexanoate content 22mol%, weight average Molecular weight: 620,000 g / mol), premixed by a high-speed mixer, melt-blended with a single-screw extruder, drawn and processed into a 3D printing filament with...

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Abstract

The invention relates to a composite polylactic acid material for 3D printing. The high-toughness high-heat-resistance steric composite polylactic acid material suitable for 3D printing is prepared by melt blending of , by weight, 58-85% of PLLA and PDLA mixture, 0.2-2% of uracil derivative nucleating agent, 5-10% of polyethylene glycol and 10-30% of hydroxyalkanoate copolymer. The material can effectively increase crystallization speed and improve heat resistance of the polylactic acid steric composite, meets the requirement of 3D printing forming, remarkably improves impact strength of steric composite polylactic acid, remarkably increases breaking elongation and effectively solves the problem that 3D printing polylactic acid products are hard and fragile.

Description

technical field [0001] The invention belongs to the technical field of polymer material modification, and relates to a polylactic acid material, in particular to a composite polylactic acid material suitable for 3D printing with high toughness and high heat resistance stereotactic performance and a preparation method thereof. Background technique [0002] 3D printing is a rapid free prototyping technology that emerged in the mid-1990s. Its principle is based on the digital model obtained by computer modeling or scanning prototype. According to the layered two-dimensional cross-sectional data, software and numerical control system , The powdered metal, ceramic or polymer and other bondable materials are built into three-dimensional solids through layer-by-layer printing additive manufacturing. Compared with traditional molding methods, the biggest advantage of 3D printing is that it can directly generate objects of any shape from computer graphics data without machining or mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L71/02C08K5/3447B33Y70/00
CPCB33Y70/00C08L67/04C08L2201/06C08L2201/08C08L2205/025C08L2205/035C08L2205/24C08L71/02C08K5/3447
Inventor 白培康宋平李玉新赵占勇
Owner 山西阳宸中北科技有限公司
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