Polylactic resin powder for selective laser sintering and a preparation method thereof

A polylactic acid resin and laser sintering technology, applied in the field of polymer processing, can solve the problems of rough surface of powder raw material particles, few polymer powder raw materials, affecting the performance of the molded body, etc., and achieve good mechanical properties, moderate size, easy The effect of dimensional errors

Inactive Publication Date: 2016-05-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are many kinds of suitable molding materials, there are few polymer powder raw materials that can be directly applied to SLS technology and successfully produce molded products with small dimensional error, regular surface and low porosity.
In the prior art, pulverization methods, such as cryogenic pulverization, are usually used to prepare powder raw materials for SLS, which not only requires special equipment, but also the prepared powder raw material particles have a rough surface, uneven particle size, and irregular shape, which is not conducive to Formation of sintered compacts and affects the properties of compacts
At present, there is a shortage of polymer powder raw materials suitable for SLS technology in the market, so solid powder raw materials corresponding to various polymer types need to be developed urgently

Method used

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  • Polylactic resin powder for selective laser sintering and a preparation method thereof
  • Polylactic resin powder for selective laser sintering and a preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 100 parts by weight of 1510 polylactic acid resin and 1000 parts by weight of acetone were placed in an autoclave. 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 room temperature at a rate of 1.0°C / min. The polylactic acid resin powder suitable for selective laser sintering is obtained after the material is centrifugally separated and vacuum-dried.

[0029] The morphology of the obtained polylactic acid resin powder was characterized by scanning electron microscopy (see the appendix figure 1 ). The particle size of the obtained polylactic acid resin powder characterized by laser particle size meter is 30-90 μm, and the particle size distribution is D10=41 μm, D50=50 μm, D90=80 μm.

Embodiment 2

[0031]100 parts by weight of 4032D polylactic acid resin 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 the constant temperature, cool down to 95°C with cooling water at a rate of 1.0°C / min, and keep the temperature at this temperature for 75 minutes; Decrease to 20°C at a rate of 1.0°C / min and hold at 20°C for 60 minutes. The polylactic acid resin powder suitable for selective laser sintering is obtained after the material is centrifugally separated and vacuum-dried.

[0032] The morphology of the obtained polylactic acid resin powder was characterized by a scanning electron microscope (the result is similar to that of Example 1, and the SEM image is not shown here). As measured by a laser particle size analyzer, the polylactic acid resin powder obtained in this example has a particle size of 30-100 μm, ...

Embodiment 3

[0034] 100 parts by weight of 2002D polylactic acid resin and 1200 parts by weight of acetone were placed in an autoclave. Infuse high-purity nitrogen to 0.3MPa; then raise the temperature to 130°C, and keep the temperature at this temperature for 90 minutes; drop to room temperature at a rate of 0.1°C / min. The polylactic acid resin powder suitable for selective laser sintering is obtained after the material is centrifugally separated and vacuum-dried.

[0035] The morphology of the obtained polylactic acid resin powder was characterized by a scanning electron microscope (the result is similar to that of Example 1, and the SEM image is not shown here). As measured by a laser particle size analyzer, the particle size of the polylactic acid resin powder obtained in this example is 20-120 μm, and the particle size distribution is D10=30 μm, D50=67 μm, D90=105 μm.

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Abstract

The invention provides a preparation method of a polylactic resin powder for selective laser sintering. The preparation method includes the following steps: a) at a heating temperature, dissolving polylactic resin in an organic solvent composed of at least one of acetone, butanone, 2-pentanone, 3-pentanone, cyclopentanone, methyl isopropyl ketone, tetrahydrofuran and dioxane to obtain a polylactic resin solution; and b) decreasing the temperature of the polylactic resin solution to separate out a solid precipitate. In the method, a proper solvent is firstly selected, and then proper temperature increasing and decreasing methods are designed at certain temperature and under certain pressure, thereby preparing the polylactic resin powder raw material which is very suitable for the selective laser sintering in shape, characters and the like. The method is free of other additives and can be used for producing the polylactic resin powder, which is moderate in size, has a smooth surface, is good in dispersibility, is small in particle size distribution and has proper bulk density, for the selective laser sintering.

Description

technical field [0001] The invention relates to the technical field of polymer processing, and furthermore, relates to a method for polylactic acid resin powder suitable for 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 production cycle and simple process, so it is especially s...

Claims

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Application Information

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IPC IPC(8): C08J3/14C08L67/04B29C67/00
Inventor 刘建叶张师军初立秋张丽英董穆邹浩高达利
Owner CHINA PETROLEUM & CHEM CORP
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