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A polylactic acid 3D printing material and wire prepared therefrom

A 3D printing and polylactic acid technology, which is applied in the field of polylactic acid 3D printing materials and wires prepared from it, can solve the problems of wire extrusion stability that are not mentioned, and achieve good wire extrusion stability.

Active Publication Date: 2020-10-09
KINGFA SCI & TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Patent application number: 201510069937.9 discloses a 3D printing PLA consumable and its preparation method. The 3D printing PLA consumable is made of the following raw materials by weight percentage: PLA plastic 99.3-99.7%, pigment 0.1-0.3%, additive 0.2-0.4% %, but not mentioned for wire extrusion stability

Method used

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  • A polylactic acid 3D printing material and wire prepared therefrom
  • A polylactic acid 3D printing material and wire prepared therefrom
  • A polylactic acid 3D printing material and wire prepared therefrom

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preparation example Construction

[0034] The preparation method of polylactic acid is as follows:

[0035] Add L-lactic acid, D-lactic acid monomer and ZnO in the ratio of Table 1 into the reaction vessel, stir evenly, react at 80-140°C and 4-10 KPa pressure for 6-12 h, distill off water, and form low Polymer. Add ZSM-5 molecular sieves to the reaction product in a vacuum distillation reaction vessel, stir evenly, and conduct vacuum distillation at 170-210°C and 102-103 Pa pressure until no product is distilled out. The time is 7-15 hours to obtain propane lactide products.

[0036] Table 1 Reactant Raw Material Composition Ratio

[0037]

[0038] Accurately weigh a certain amount of the lactide product prepared in Table 1 into a sealed tube, then add a certain amount of stannous isooctanoate dichloromethane solution, and remove the solvent dichloromethane at room temperature. Place the sealed tube at room temperature, evacuate, inject high-purity nitrogen, and repeat three times. After evacuating for h...

Embodiment 1-6

[0041] Example 1-6: Preparation of polylactic acid 3D printing materials

[0042] Mix PLA and processing aids according to the parts by weight shown in Table 3, put them into a twin-screw extruder, extrude and pelletize at 160°C-180°C, and obtain polylactic acid 3D printing materials;

[0043] Pull the polylactic acid 3D printing material on a single-screw extruder, control the extrusion temperature of the single screw to 160°C-210°C, and control the temperature of the water tank to be between 40°C and 60°C to obtain the polylactic acid 3D printing wire. Among them, The wire diameter of the extruded wire is 1.75cm, and the wire extrusion speed is 45Kg / h. The performance test results are shown in Table 1.

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Abstract

The invention discloses a polylactic acid 3D printing material and a wire prepared therefrom, comprising the following components: (a) 98.0-100 parts of polylactic acid; (b) 0-2.0 parts of a processing aid; wherein, based on the whole polylactic acid The total weight of the polylactic acid has a number average molecular weight Mn of 50,000 to 150,000. The structure of the polylactic acid 3D printing material satisfies the following relationship: 0.8≤Mx / Dx≤7, where Dx represents the polydispersity coefficient and is defined as Mw / Mn, where Mw is the weight average molecular weight of the polylactic acid 3D printing material, and Mn is The number average molecular weight of the polylactic acid 3D printing material, Mx represents the melt flow rate of the polylactic acid 3D printing material at a temperature of 190°C and a load of 2.16kg. The present invention finds through research that when the structure of the polylactic acid 3D printing material satisfies the following relational formula: 0.8≤Mx / Dx≤7, the extrusion speed of the polylactic acid 3D printing material is 45Kg / h, and the diameter of the extruded wire is When the wire diameter is 1.75cm, the extreme difference of the wire diameter is ≤0.12cm, and the relative deviation of the wire diameter is less than 5%, thus showing good wire extrusion stability.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a polylactic acid 3D printing material and a wire prepared therefrom. Background technique [0002] Starch-rich corn can produce a colorless and transparent liquid - lactic acid through modern biotechnology, and then through a special polymerization process to produce a granular polymer material - polylactic acid (PLA). PLA has the best tensile strength and elongation, and can be produced by various common processing methods, such as: melt extrusion molding, injection molding, blown film molding, foam molding and vacuum forming, etc. In addition, due to the good biodegradability of PLA, PLA plastics can be used in 3D printing materials, but at this stage, the promotion and application of PLA as a general-purpose plastic, especially the base material of 3D printing consumables, is still subject to certain restrictions. Mainly due to the severe brittleness of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04D01F6/92D01F6/62B33Y70/00B33Y70/10
CPCD01F6/92C08L67/04B33Y70/10
Inventor 熊凯袁志敏蔡彤旻黄险波曾祥斌焦建卢昌利杨晖麦开锦董学腾
Owner KINGFA SCI & TECH CO LTD
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