Polypropylene resin powder for selective laser sintering and preparation method thereof

A polypropylene resin and laser sintering technology, which is applied in the field of polymer processing, can solve the problems of rough surface of powder raw material particles, scarce polymer powder raw materials, unfavorable sintered moldings, etc., and achieve good mechanical properties, moderate size, and easy The effect of size error

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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  • Polypropylene resin powder for selective laser sintering and preparation method thereof
  • Polypropylene resin powder for selective laser sintering and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 100 parts by weight of polypropylene resin (95% isotacticity, melt index (210° C., 2.16 kg) of 30 g / 10 min) and 1000 parts by weight of acetone were placed in an autoclave. Introduce high-purity nitrogen to 0.2MPa; then raise the temperature to 140°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 polypropylene resin powder suitable for selective laser sintering is obtained after the material is subjected to centrifugal separation and vacuum drying.

[0028] The morphology of the obtained polypropylene resin powder was characterized by a scanning electron microscope (see appendix figure 1 ). The particle size of the polypropylene resin powder obtained by laser particle size analyzer is 35-100 μm, and the particle size distribution...

Embodiment 2

[0030] 100 parts by weight of polypropylene resin (97% isotacticity, melt index (210° C., 2.16 kg) of 50 g / 10 min) and 800 parts by weight of acetone were placed in an autoclave. Introduce high-purity nitrogen to 0.3MPa; then raise the temperature to 150°C, and keep the temperature at this temperature for 30 minutes; after the constant temperature is over, the cooling water will drop to 95°C at a rate of 1.0°C / min, and keep the temperature at this temperature for 60 minutes; Decrease to 20°C at a rate of 1.0°C / min and hold at 20°C for 60 minutes. The polypropylene resin powder suitable for selective laser sintering is obtained after the material is subjected to centrifugal separation and vacuum drying.

[0031]The morphology of the obtained polypropylene 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 polypropylene resin powder...

Embodiment 3

[0033] 100 parts by weight of polypropylene resin (96% isotacticity, melt index (210° C., 2.16 kg) of 50 g / 10 min) and 1200 parts by weight of acetone were placed in an autoclave. Introduce high-purity nitrogen to 0.1MPa; 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 polypropylene resin powder suitable for selective laser sintering is obtained after the material is subjected to centrifugal separation and vacuum drying.

[0034] The morphology of the obtained polypropylene 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 polypropylene resin powder obtained in this example has a particle size of 30-125 μm, and a particle size distribution of D10=34 μm, D50=64 μm, and D90=112 μm.

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Abstract

The invention provides a preparation method of a polypropylene resin powder for selective laser sintering. The preparation method includes the following steps: a) at a heating temperature, dissolving polypropylene 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 polypropylene resin solution; and b) decreasing the temperature of the polypropylene 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 polypropylene 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 polypropylene 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 polypropylene 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 sui...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/14C08L23/12
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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