Nylon resin powder for selective laser sintering and preparation method of nylon resin powder

A nylon resin and laser sintering technology, which is applied in the field of polymer processing, can solve the problems of affecting the performance of the molded body, unfavorable sintered molded body, and lack of raw materials.

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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  • Nylon resin powder for selective laser sintering and preparation method of nylon resin powder
  • Nylon resin powder for selective laser sintering and preparation method of nylon resin powder
  • Nylon resin powder for selective laser sintering and preparation method of nylon resin powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] 100 parts by weight of nylon 56 resin and 1000 parts by weight of ethanol were placed in an autoclave. Introduce high-purity nitrogen to 0.2MPa; then raise the temperature to 200°C, and keep the temperature at this temperature for 120 minutes; after the end of the constant temperature, cool down to 130°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, nylon 56 resin powder suitable for selective laser sintering was ob...

Embodiment 2

[0057] 100 parts by weight of nylon 56 resin and 800 parts by weight of ethanol were placed in an autoclave. Introduce high-purity nitrogen to 0.3MPa; then raise the temperature to 210°C, and keep the temperature at this temperature for 90 minutes; after the constant temperature is over, the cooling water will drop to 125°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 nylon 56 resin powder suitable for selective laser sintering. The particle s...

Embodiment 3

[0059] 100 parts by weight of nylon 56 resin and 1100 parts by weight of ethanol were placed in an autoclave. Introduce high-purity nitrogen to 0.1MPa; then raise the temperature to 200°C, and keep the temperature at this temperature for 150 minutes; cool down to room temperature at a rate of 0.1°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 0.1 weight fractions After the antioxidant 1010, 0.1 parts by weight of antioxidant 168, and 0.75 parts by weight of nano-silica, the materials were centrifuged and vacuum-dried to obtain nylon 56 resin powder suitable for selective laser sintering. The particle size and particle size distribution results of the obtained nylon 56 resin powder are shown in Table 1.

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Abstract

The invention provides a method for preparing nylon resin powder for selective laser sintering. The method comprises the following steps: a) dissolving a nylon resin in an amide and / or alcohol organic solvent at a heating temperature so as to obtain a nylon resin solution; b) cooling the nylon resin solution obtained in the step a), and separating out the solid precipitate so as to obtain a solid-liquid mixture; c) adding aids into the solid-liquid mixture obtained in the step b), and uniformly mixing; and d) performing solid-liquid separation, and drying the solids, thereby obtaining the nylon resin powder for laser sintering, wherein the aids comprise functional aids, a powder release agent and an antioxidant. The invention further provides a selective laser sintering method taking the nylon powder as a raw material.

Description

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

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/06C08K13/06C08K9/12C08K3/08C08K7/24C08K7/14C08K5/378C08K3/04C08K3/22C08K13/04
CPCC08K3/04C08K3/08C08K3/22C08K5/378C08K7/14C08K7/24C08K9/12C08K13/04C08K13/06C08K2003/0806C08K2003/0812C08K2003/2296C08K2201/001C08K2201/003C08K2201/004C08K2201/011C08K2201/014C08K2201/017C08L2201/04C08L2201/08C08L77/06
Inventor 王绍杰刘建叶初立秋吴长江张师军邹浩吕明福权慧郭鹏徐凯白弈青侴白舸
Owner CHINA PETROLEUM & CHEM CORP
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