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Polyformaldehyde resin powder for selective laser sintering and preparation method thereof

A polyoxymethylene resin, laser sintering technology, applied in the direction of additive processing, can solve the problems of irregular shape, lack of raw materials, affecting the performance of the molded body, etc., to achieve the effect of improving heat resistance and service life, and reducing the degradation mechanism

Inactive Publication Date: 2017-10-31
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 a wide variety 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 errors and regular surfaces.
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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  • Polyformaldehyde resin powder for selective laser sintering and preparation method thereof
  • Polyformaldehyde resin powder for selective laser sintering and preparation method thereof

Examples

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Effect test

Embodiment 1

[0055] 100 parts by weight of polyoxymethylene resin (melt index (190° C., 2.16 kg) is 50 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 130°C, and keep the temperature at this temperature for 90 minutes; after the end of 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. Add 0.5 parts by weight of zirconium phosphate silver-loaded antibacterial agent in the solid-liquid mixture obtained, carbon nanotubes of 0.5 parts by weight, add 10 parts by weight of ultra-short glass fibers with a diameter of 5 μm and a length of 150 μm, and an antioxidant of 0.25 parts by weight 1010 and 0.25 parts by weight of antioxidant 168, and 0.5 parts by weight of calcium stearate, after centrifugal separation and vacuum drying, polyoxymethylene r...

Embodiment 2

[0057] 100 parts by weight of polyoxymethylene resin (melt index (190° C., 2.16 kg) is 65 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 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. Add 0.05 parts by weight of zinc pyrithione, 5 parts by weight of conductive carbon black, 25 parts by weight of ultra-short glass fibers with a diameter of 10 μm and a length of 250 μm, 0.25 parts by weight of antioxidant 1010 and 0.25 parts by weight of the obtained solid-liquid mixture. After the antioxidant 168 in parts by weight and zinc stearate in 1 part by weight, the material is centrifuged and vacuum-dried to obtain polyoxymethylene resin ...

Embodiment 3

[0059] 100 parts by weight of polyoxymethylene resin (melt index (190° C., 2.16 kg) is 30 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 120 minutes; cool down to room temperature at a rate of 0.5°C / min. In the obtained solid-liquid mixture, add 1.5 weight fractions of nano zinc oxide, 2.5 weight fractions of conductive carbon black and 0.1 weight fractions of carbon nanotubes, 10 weight fractions of ultra-short glass fibers with a diameter of 15 μm and a length of 200 μm, and 0.2 weight fractions After the antioxidant 1010, 0.2 parts by weight of antioxidant 168, and 0.75 parts by weight of nano-silica, the materials were centrifuged and vacuum-dried to obtain polyoxymethylene resin powder suitable for selective laser sintering. The particle size and particle size distribution results of the polyoxymethylene resin powder o...

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Abstract

The invention provides a method for preparing polyformaldehyde resin powder for selective laser sintering, which comprises the following steps: (1) dissolving polyformaldehyde resin in at least one organic solvent selected from amide, cyclic ether, ketone and chloralkane at a heating temperature to obtain a polyformaldehyde resin solution; (b) cooling the polyformaldehyde resin solution obtained in the step (a) until solid precipitate is separated out to obtain a solid-liquid mixture; (c) adding an additive into the solid-liquid mixtu.

Description

technical field [0001] The invention relates to the technical field of polymer processing, in particular to a polyoxymethylene resin powder for selective laser sintering, a preparation method thereof and an application in selective laser sintering. Background technique [0002] Selective Laser Sintering (Selective Laser Sintering, SLS) is a rapid prototyping technology. The computer first scans the three-dimensional entity, and then selectively sinters the material powder pre-laid on the workbench or parts by high-intensity laser irradiation. Layer by layer melting and sintering, and then realize the technology of layer-by-layer molding. SLS 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 suitable for the development of new products. At present, SLS is the most widely used and most promising tech...

Claims

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Application Information

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IPC IPC(8): C08J3/14C08L59/00C08K13/06C08K9/12C08K13/04C08K7/24C08K7/14C08K3/36C08K3/22C08K3/26C08K3/30B33Y70/00
CPCC08J3/14B33Y70/00C08J2359/00C08K3/22C08K3/26C08K3/30C08K3/36C08K7/14C08K7/24C08K9/12C08K13/04C08K13/06C08K2003/2227C08K2003/2241C08K2003/2296C08K2003/265C08K2003/3045C08K2201/003C08K2201/004C08L2201/08C08L59/00
Inventor 王绍杰刘建叶初立秋吴长江张师军邹浩张丽英高达利董穆邵静波吕芸徐毅辉
Owner CHINA PETROLEUM & CHEM CORP
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