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Preparation method of fused deposition modeling 3D printing heat-resistant stereopolylactic acid wire

A fused deposition modeling and 3D printing technology, applied in the field of stereoscopic polylactic acid wire and its preparation, can solve the problems of inability to meet the requirements of polylactic acid 3D printing materials, ineffective biodegradation, limited improvement, etc., and achieves simple heat treatment process and usability. Good, slow down the cooling effect

Inactive Publication Date: 2022-04-08
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method improves the crystallinity and heat-resistant temperature of polylactic acid to a certain extent, but the modified substances used in this polylactic acid composite material are uracil derivative nucleating agents, polyethylene glycol, and hydroxyalkanoate esters. The copolymer is a non-renewable resource and cannot be effectively biodegraded, which destroys the valuable degradability of the polylactic acid material itself
[0008] Chinese patent application CN109504048 A discloses a thermally reversible crosslinking composition modified polylactic acid 3D printing wire and its preparation method. The method is based on the polylactic acid made of 3D printing material with poor heat resistance, which is suitable for applications at slightly higher temperatures. The field is prone to deformation and difficult to apply, and combined with the requirements of FDM printing on the rheological properties of materials, a thermally reversible crosslinking composition is used to modify polylactic acid, and a flow agent is added to the modified system to enhance toughness. FDM printing wire with stable wire diameter, smooth surface and excellent heat resistance performance
Although this method improves the heat resistance of polylactic acid wires, its softening point temperature is only 15-26°C higher than that of general-purpose polylactic acid at present, and the degree of improvement is limited. Requirements for working at high temperatures

Method used

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  • Preparation method of fused deposition modeling 3D printing heat-resistant stereopolylactic acid wire
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  • Preparation method of fused deposition modeling 3D printing heat-resistant stereopolylactic acid wire

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preparation example Construction

[0048] The preparation process of dextrorotary polylactic acid in the embodiment of the present application is as follows: adding dextrorotary lactide into a closed reaction vessel, adding a catalyst and an initiator at the same time, and reacting in a vacuum to obtain dextrorotatory polylactic acid. Specific steps are as follows:

[0049] Step 1: Take 10,000 parts of D-lactide, 5 parts of catalyst (stannous octoate), and 15.5 parts of initiator (dodecanol) according to the ratio of parts by mass, put them into the reactor together, and then vacuumize Inflate with nitrogen, repeat 5 times to reach high vacuum, and remove water for 2 hours at 40°C;

[0050] The second step: heat up to 150°C, and the vacuum degree is -0.08MPa, and continue to react for another 3 hours;

[0051] The third step: the temperature is raised to 180° C., the degree of vacuum is high vacuum, and the reaction is continued for another 3 hours to obtain the product.

[0052] In the examples of this appli...

Embodiment 1

[0058] (1) Weigh 200g of left-handed polylactic acid (PLLA) powder and 200g of right-handed polylactic acid (PDLA) powder, the mesh number is 300, under the action of ball mill mechanical stirring, at 200rpm, initially stir and mix for 20 minutes to obtain L / D Polylactic acid powder mix.

[0059] (2) Place the above L / D polylactic acid powder mixture in a vacuum drying oven for sufficient drying; after taking it out, add it to a co-rotating / counter-rotating twin-screw extruder to heat (temperature 230°C, screw speed 100rpm), and mix thoroughly 5 minutes until uniform, to obtain the L / D polylactic acid molten mixture.

[0060] (3) Put the above-mentioned L / D polylactic acid molten mixture in a vacuum drying oven for sufficient drying at a drying temperature of 50°C; after taking it out, put it into a wire extruder for melt extrusion and wire drawing (the temperature in the cavity is 230°C, The rotation speed is 20rpm), and after cooling and shaping (air cooling, the air temper...

Embodiment 2

[0067] (1) Weigh 200 g of left-handed polylactic acid (PLLA) powder and 200 g of right-handed polylactic acid (PDLA) powder respectively, with a mesh number of 300. Both powders have a high mesh number for uniform dispersion. This ratio can maximize the polylactic acid with stereocomplex structure in subsequent processing. And under the action of ball mill mechanical stirring, at 200rpm, initially stirred and mixed for 20 minutes to obtain the L / D polylactic acid powder mixture.

[0068] (2) Place the above-mentioned L / D polylactic acid powder mixture in a vacuum drying oven for sufficient drying at a drying temperature of 50°C; ℃, screw speed 100rpm), fully mixed for 5 minutes until uniform, to obtain L / D polylactic acid molten mixture.

[0069] (3) Place the above-mentioned L / D polylactic acid molten mixture in a vacuum drying oven for sufficient drying; after taking it out, add it to a wire extruder for melt extrusion and wire drawing (the temperature in the cavity is 230...

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Abstract

The invention discloses a preparation method of a fused deposition modeling 3D printing heat-resistant stereopolylactic acid wire. The bottleneck problem that a polylactic acid stereocompounding technology is directly applied to 3D printing manufacturing is solved. Under the processing conditions of a co-rotating / counter-rotating twin-screw extruder and a wire extruder, no compatilizer or modifier needs to be introduced, the heat-resistant stereopolylactic acid 3D printing wire is prepared by virtue of the extremely strong stereocomposite acting force between the poly-L-lactic acid and the poly-D-lactic acid, the advantages and characteristics of full green and full biodegradation of the polylactic acid material are retained, and the 3D printing wire has good application prospects. The heat resistance of the wire is effectively improved, the softening point is improved by 60-70 DEG C, and the wire has the characteristics of difficulty in hydrolysis and high tensile strength. Based on the wire rod, a printing finished product with an all-stereo composite structure can be further processed, and the strength, the heat resistance and the hydrolysis resistance of a final material can be greatly and synchronously improved.

Description

technical field [0001] The invention relates to a stereotactic polylactic acid wire and a preparation method thereof, in particular to a high heat-resistant polylactic acid wire suitable for fused deposition modeling 3D printing and a preparation method thereof. Background technique [0002] In recent years, 3D printing has become one of the research hotspots in material forming technology. It is a rapid prototyping additive manufacturing technology based on digital simulation, using bondable materials such as powdered metal or plastic, and constructing objects by layer-by-layer printing. Compared with traditional material forming methods, 3D printing has unique advantages: high efficiency, high material utilization, low cost, less restrictive working environment, not limited by the complexity of products, wide application fields, and environmental protection. [0003] Fused deposition modeling (FDM) is one of several molding methods of 3D printing technology. It was invent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C48/05B29C48/885B29C71/02B29K67/00
Inventor 李蔚杨静杨一奇徐荷澜侯秀良
Owner JIANGNAN UNIV