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Antistatic polylactic resin powder used for selective laser sintering, and preparation method thereof

A polylactic acid resin and laser sintering technology, applied in the field of polymer processing, can solve the problems of limited application, affecting processing performance and product performance, high volume resistance, etc., to achieve enhanced antistatic performance, moderate powder size, and uniform particle size distribution Effect

Active Publication Date: 2017-04-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as a polymer, PLA has a high volume resistance, which often affects its processing performance and product performance due to static electricity during use, especially limiting its application in medical devices, packaging materials, etc.

Method used

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  • Antistatic polylactic resin powder used for selective laser sintering, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] 100 parts by weight of 1510 brand polylactic acid resin (99% optical purity) and 1000 parts by weight of acetone were placed in a high-pressure reactor. Introduce high-purity nitrogen to 0.2MPa; then raise the temperature to 135°C, and keep the temperature at this temperature for 60 minutes; after the end of constant temperature, cool down to 100°C with cooling water at a rate of 1.0°C / min, and keep the temperature at this temperature for 60 minutes; continue Decrease to 25°C at a rate of 1.0°C / min, and keep at this temperature for 60 minutes. After adding 0.5 weight fraction of carbon nanotubes, 0.25 weight fraction of antioxidant 1330, and 0.5 weight fraction of calcium stearate into the obtained solid-liquid mixture, centrifuged and vacuum dried to obtain Antistatic polylactic acid resin powder. The particle size of the antistatic polylactic acid resin powder obtained by laser particle size measurement is 30-90 μm, and the particle size distribution is D10=41 μm, D5...

Embodiment 2

[0042] 100 parts by weight of 4032D grade polylactic acid resin (98% optical purity) and 800 parts by weight of acetone were placed in an autoclave. Introduce high-purity nitrogen to 0.1MPa; then raise the temperature to 140°C, and keep the temperature at this temperature for 30 minutes; after the end of constant temperature, cool down to 20°C with cooling water at a rate of 1.0°C / min, and keep at 20°C for 60 minutes. After adding 5 weight fractions of superconducting carbon black, 0.5 weight fractions of antioxidant 1330, and 1 weight fractions of zinc stearate into the obtained solid-liquid mixture, it was centrifuged and vacuum-dried to obtain suitable for selective laser sintering. Antistatic polylactic acid resin powder. As measured by a laser particle size analyzer, the particle size of the antistatic polylactic acid resin powder obtained in this example is 30-100 μm, and the particle size distribution is D10=44 μm, D50=58 μm, D90=88 μm.

Embodiment 3

[0044] 100 parts by weight of 2002D polylactic acid resin (96% optical purity) and 1200 parts by weight of acetone were placed in an autoclave. Introduce high-purity nitrogen to 0.3MPa; then raise the temperature to 130°C, and keep the temperature at this temperature for 90 minutes; after the constant temperature is completed, cool down to 25°C with cooling water at a rate of 0.1°C / min, and keep the temperature at this temperature for 90 minutes. After adding 2.5 weight fraction of conductive carbon black and 0.1 weight fraction of carbon nanotubes, 0.25 weight fraction of antioxidant 1330, and 0.75 weight fraction of nano-silica in the obtained solid-liquid mixture, after centrifugal separation and vacuum drying The antistatic polylactic acid resin powder suitable for selective laser sintering is obtained. As measured by a laser particle size analyzer, the particle size of the antistatic polylactic acid resin powder obtained in this example is 20-120 μm, and the particle size...

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Abstract

The invention provides a preparation method of an antistatic polylactic resin powder used for selective laser sintering. The method comprises the following steps: 1, dissolving polylactic resin in a ketone and / or ether organic solvent at a heating temperature to obtain a polylactic resin solution; 2, cooling the polylactic resin obtained in step 1 to precipitate a solid precipitate; and 3, adding assistants to a solid-liquid mixture obtained in step 2, uniformly mixing the solid-liquid mixture and the assistants, and drying the obtained mixture to obtain the powder, wherein the assistants comprise an antistatic agent, an antioxidant and a powdery isolating agent. The method has the advantages of simplicity in operation, easiness in operation, provision of a sintering raw material with excellent processing properties for the selective laser sintering, and provision of a new direction for processing and application of functional polylactic resin. The invention further provides the antistatic polylactic resin powder prepared through the method, and a selective sintering method adopting the antistatic polylactic resin powder as a sintering powder raw material.

Description

technical field [0001] The invention relates to the technical field of polymer processing, in particular to an antistatic polylactic acid resin powder for selective laser sintering, a preparation method thereof and an application in selective laser sintering. Background technique [0002] Selective Laser Sintering (SLS) technology is a rapid prototyping technology, which is currently the most widely used and most promising technology in additive manufacturing technology, showing a rapid development trend in recent years. SLS technology is a technology in which the computer first scans the three-dimensional entity, and then selectively melts and sinters the material powder pre-laid on the workbench or parts through high-intensity laser irradiation, and then realizes layer-by-layer molding. . SLS technology has a high degree of design flexibility, can manufacture accurate models and prototypes, can form parts with reliable structures that can be used directly, and has a short...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08K7/24C08K5/098C08K3/04C08K3/36C08K3/22C08K3/08B29C67/06
Inventor 初立秋刘建叶张师军权慧邹浩徐耀辉徐萌杨庆泉尹华白弈青
Owner CHINA PETROLEUM & CHEM CORP
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