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Preparation method of nylon micro powder for selective laser sintering

A laser sintering and selective technology, applied in the field of selective laser sintering materials, can solve the problems of nylon powder solubility limitation, narrow powder material sintering window, affecting the quality of SLS parts, etc., and achieve SLS sintering accuracy improvement, particle shape and flow. The effect of good performance and excellent physical and chemical properties

Active Publication Date: 2016-03-30
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of nylon powder by this method is limited by solubility, and the yield is not high
Moreover, most of the nylon powder prepared by the existing solvent precipitation method is based on the use of nylon powder coatings and nylon injection molded parts. There are still many defects in its performance during SLS molding and manufacturing, such as the powder particle shape and particle size distribution are not uniform enough, and the heat resistance of the powder is insufficient. The sintering window of powder materials is poor, the sintering window of powder materials is narrow, etc. The existing nylon powder materials have strict requirements on sintering process and equipment. Improper control of sintering temperature will make it difficult to control the melting of powder in the sintering process or warp deformation of parts due to internal stress, thus affecting SLS manufacturing. piece quality

Method used

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  • Preparation method of nylon micro powder for selective laser sintering
  • Preparation method of nylon micro powder for selective laser sintering
  • Preparation method of nylon micro powder for selective laser sintering

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Add 50g of nylon 12 pellets, 10g of polyvinylpyrrolidone (PVP), and 500ml of formic acid into the reaction kettle and heat up to 70°C, stir for 2 hours to fully dissolve the materials, then add 800ml of ethanol and stir to precipitate powder, filter, wash, and dry to obtain Nylon powder;

[0039] Take 50g of the above-mentioned nylon micropowder, 0.1g of flow aid nano silicon dioxide, and 0.1g of antioxidant 2,2'-methylenebis-(4-methyl-6-tert-butylphenol) in a vertical Stir and mix in an agitator for 1 hour, pass the material through a 150-mesh sieve after uniform mixing, and obtain nylon micropowder for selective laser sintering. figure 1 The scanning electron micrograph of the selective laser sintering nylon micropowder prepared for embodiment 1, Figure 6The DSC curve chart of the nylon micropowder for selective laser sintering prepared in embodiment 1. It can be seen from the figure that the powder has an average particle size of 45 microns, a melting point of 179...

Embodiment 2

[0041] Add 50g of nylon 12 pellets, 10g of polyvinylpyrrolidone (PVP), and 800ml of acetic acid into the reaction kettle and heat up to 120°C, stir for 2 hours to fully dissolve the materials, then add 600ml of ethanol and stir to precipitate powder, filter, wash, and dry to obtain Nylon powder;

[0042] Get 50g of nylon micropowder obtained in the previous step, and 0.1g of flow aid nano-silica, 0.1g of antioxidant 2,2'-methylenebis-(4-methyl-6-tert-butylphenol), and Stir and mix in a type agitator for 1 hour, pass the material through a 150-mesh sieve after uniform mixing, and obtain nylon micropowder for selective laser sintering, with an average particle size of 50 microns. figure 2 Scanning electron micrograph of the nylon micropowder for selective laser sintering prepared in Example 2.

Embodiment 3

[0044] Add 50g of nylon 12 pellets, 10g of polyvinylpyrrolidone (PVP), and 500ml of trifluoroacetic acid into the reaction kettle and heat up to 50°C, stir for 2 hours to fully dissolve the materials, then add 800ml of ethanol and stir to precipitate powder, filter, wash, and dry , to obtain nylon powder;

[0045] Get 50g of nylon micropowder obtained in the previous step, and 0.1g of flow aid nano-silica, 0.1g of antioxidant 2,2'-methylenebis-(4-methyl-6-tert-butylphenol), and Stir and mix in a type agitator for 1 hour, pass the material through a 150-mesh sieve after uniform mixing, and obtain nylon micropowder for selective laser sintering, with an average particle size of 90 microns. image 3 Scanning electron micrograph of the nylon micropowder for selective laser sintering prepared in Example 3.

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Abstract

The present invention discloses a preparation method of nylon micro powder for selective laser sintering, the method is as follows: in the manner of dissolution-precipitation, first a dispersant is introduced into a polymer good solvent system, a poor solvent is added for precipitating of a polymer, and by use of the interaction of the dispersant and polymer chains in the system and particle stability protective effect, well dispersed polymer microspheres can be obtained. A used solvent and the used dispersant both can be recycled, compared with the prior art, no high-temperature high-pressure equipment is used, the process is simple, and the preparation method is cost-effective, environmentally-friendly and easy to implement. According to the method, the nylon powder for selective laser sintering with excellent physical and chemical properties can be obtained, the nylon powder has good particle shape and liquidity, larger sintering window, and better heat resistance and thermal stability, and can meet the needs of SLS parts in the aerospace, automotive, medical equipment, electronic equipment, machinery mold, art work and other fields.

Description

technical field [0001] The invention relates to the field of selective laser sintering materials, in particular to a preparation method of nylon micropowder for selective laser sintering. Background technique [0002] Selective laser sintering (SLS) is an important technology of 3D printing-additive manufacturing. The computer controls the infrared laser beam, scans and sinters the solid powder layer by layer at a certain speed and energy density, accumulates layers, and finally forms a shaped part. Material performance is a key link in the development of SLS technology, which directly affects the forming speed, precision and physical and chemical properties of sintered samples. Polymer powders represented by nylon 12 and their modified materials have the advantages of low water absorption, low melting point, low density, low shrinkage, heat resistance, and easy molding. source material. [0003] SLS technology requires powder materials with a diameter of 20-100 microns, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/02C08L77/06C08K3/34C08K3/36C08K3/22C08J3/12C08L25/06C08L69/00C08L55/02C08L27/06C08L23/06C08L23/12C08L67/04C08L33/12C08L67/00
Inventor 王格侠甄志超王萍丽季君晖
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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