Polypropylene resin powder for selective laser sintering as well as preparation method and application thereof

A polypropylene resin and laser sintering technology, applied in the direction of additive processing, etc., can solve the problems of rough surface of powder raw material particles, scarce polymer powder raw materials, affecting the performance of molded products, etc., to achieve good mechanical properties, moderate size, smooth surface effect

Inactive 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

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] 100 parts by weight of homopolypropylene resin (95% isotacticity, melt index (210°C, 2.16kg) is 30g / 10min) and 1000 parts by weight of n-hexane are placed in the autoclave, and 0.2 parts by weight are added calcium oxide mixture. Introduce high-purity nitrogen to 0.2MPa; then raise the temperature to 130°C, and keep the temperature at this temperature for 60 minutes; after the end of the constant temperature, cool down to 90°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. After adding 0.25 parts by weight of antioxidant 1010 and 0.25 parts by weight of antioxidant 168, and 0.5 parts by weight of calcium stearate into the obtained solid-liquid mixture, after centrifugation and vacuum drying, it is suitable for selective laser sintering. polypropylene resin powder. The particle size and particle size distribution results of the obtained polypropylene r...

Embodiment 2

[0048] 100 parts by weight of homopolypropylene resin (97% isotacticity, melt index (210°C, 2.16kg) is 50g / 10min) and 800 parts by weight of n-hexane are placed in the autoclave, and 0.4 parts by weight of calcium oxide mixture. Introduce high-purity nitrogen to 0.3MPa; then raise the temperature to 140°C, and keep the temperature at this temperature for 30 minutes; after the constant temperature is over, the cooling water will drop to 85°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. After adding 0.25 parts by weight of antioxidant 1010 and 0.25 parts by weight of antioxidant 168 and 1 part by weight of zinc stearate to the obtained solid-liquid mixture, the material was centrifuged and vacuum-dried to obtain Laser sintered polypropylene resin powder. The particle size and particle size distribution results of the obtained polypropylene resin powder are shown in ...

Embodiment 3

[0050] 100 parts by weight of homopolypropylene resin (96% isotacticity, melt index (210°C, 2.16kg) is 50g / 10min) and 1200 parts by weight of n-hexane are placed in the autoclave, and 0.8 parts by weight are added calcium oxide mixture. Introduce high-purity nitrogen to 0.1MPa; then raise the temperature to 120°C, and keep the temperature at this temperature for 90 minutes; cool down to room temperature at a rate of 0.1°C / min. After adding 0.1 parts by weight of antioxidant 1010 and 0.1 parts by weight of antioxidant 168, and 0.75 parts by weight of nano-silica in the obtained solid-liquid mixture, the material was centrifuged and vacuum-dried to obtain a compound suitable for selectivity. Laser sintered polypropylene resin powder. The particle size and particle size distribution results of the obtained polypropylene resin powder are shown in Table 1.

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Abstract

The invention provides polypropylene resin powder for selective laser sintering as well as a preparation method thereof. The method comprises the following steps: at a heating temperature, dissolving polypropylene resin in at least one organic solvent of C5-C9 alkanes, and adding a nucleating agent to obtain a polypropylene resin solution; cooling the obtained polypropylene resin solution to precipitate out solid to obtain a solid-liquid mixture; adding an additive into the obtained solid-liquid mixture, and mixing uniformly; and performing solid-liquid separation and drying the solid to obtain polypropylene resin powder applicable to selective laser sintering, wherein the additive comprises a powder separating agent and/or antioxidant. The polypropylene resin powder prepared by the invention has the advantages of good oxidation resistance and powder fluidity, moderate size, smooth surface, proper bulk density and suitable dispersity and particle size distribution. The invention also provides a selective laser sintering method taking the polypropylene powder prepared by the method as a raw material.

Description

technical field [0001] The invention relates to the technical field of polymer processing, in particular to a polypropylene 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 production cy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/14C08L23/12C08K13/02C08K3/22C08K5/134C08K5/526C08K5/098B29C67/04B33Y70/00
Inventor 刘建叶张师军初立秋张丽英董穆邹浩高达利侴白舸尹华杨庆泉李杰白弈青
Owner CHINA PETROLEUM & CHEM CORP
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