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Polyethylene resin powder used for selective laser sintering and preparation method and application thereof

A polyethylene resin, 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., to achieve good mechanical properties, moderate size, easy The effect of dimensional errors

Inactive Publication Date: 2017-05-17
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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  • Polyethylene resin powder used for selective laser sintering and preparation method and application thereof
  • Polyethylene resin powder used for selective laser sintering and preparation method and application thereof
  • Polyethylene resin powder used for selective laser sintering and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] 100 parts by weight of polyethylene resin (density 0.950g / cm 3 , the melt index (190° C., 2.16 kg) is 40 g / 10 min) and 1000 parts by weight of n-hexane are placed in a high-pressure reactor. Introduce high-purity nitrogen to 0.2MPa; then raise the temperature to 110°C, and keep the temperature at this temperature for 60 minutes; after the end of the constant temperature, cool down to 70°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. of polyethylene resin powder. The particle size and particle size distribution results of the obtained polyethylene resin powder are shown in Table 1.

Embodiment 2

[0045] With 100 parts by weight of polyethylene resin (density 0.960g / cm 3 , the melt index (190° C., 2.16 kg) is 60 g / 10 min) and 800 parts by weight of n-hexane are placed in a high-pressure reactor. Introduce high-purity nitrogen to 0.3MPa; then raise the temperature to 120°C, and keep the temperature at this temperature for 30 minutes; after the constant temperature is over, the cooling water will drop to 65°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 polyethylene resin powder. The particle size and particle size distribution results of the obtained polyethylene resin powder are shown in Table 1.

Embodiment 3

[0047] 100 parts by weight of polyethylene resin (density 0.970g / cm 3 , the melt index (190° C., 2.16 kg) is 50 g / 10 min) and 1200 parts by weight of n-hexane are placed in a high-pressure reactor. Introduce high-purity nitrogen to 0.1MPa; then raise the temperature to 100°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 polyethylene resin powder. The particle size and particle size distribution results of the obtained polyethylene resin powder are shown in Table 1.

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Abstract

The invention provides a polyethylene resin powder used for selective laser sintering and a preparation method and an application thereof. The method comprises the following steps: under heating temperature, dissolving polyethylene in at least one of organic solvents of C5-C9 alkanes to obtain a polyethylene resin solution; precipitating the solid precipitate to obtain a solid-liquid mixture; adding an auxiliary agent in the obtained solid-liquid mixture, removing the solvent, and drying the material to obtain the polyethylene resin powder used for laser sintering; wherein the auxiliary agent comprises an antioxidant and / or a powder parting agent. The polyethylen resin powder has the advantages of appropriate size, smooth surface, good dispersibility, small size distribution, good oxidation resistance and flowability, and is suitable for various molded products used for selective laser sintering. The invention provides the selective laser sintering method by taking polyethylen resin powder as a raw material.

Description

technical field [0001] The invention relates to the technical field of polymer processing, in particular to a polyethylene 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 cyc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/14C08L23/06C08K5/134C08K5/526C08K5/098
Inventor 刘建叶初立秋张丽英张师军高达利董穆邹浩侴白舸邵静波吕芸白弈青徐毅辉
Owner CHINA PETROLEUM & CHEM CORP
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