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Method for preparing nylon powder for selective laser sintering

A nylon powder and laser sintering technology, which is applied in the field of nylon powder preparation, can solve the problems of uneven particle shape and particle size distribution, narrow sintering window of powder materials, and affecting the quality of SLS parts, so as to achieve good particle shape and fluidity , SLS sintering accuracy improvement, the effect of excellent physical and chemical properties

Inactive Publication Date: 2011-08-03
HUNAN FARSOON HIGH TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The nylon powder prepared by the existing method still has many defects when it is used for SLS molding and manufacturing, such as powder particle shape and particle size distribution are not uniform enough, the heat resistance of the powder is poor, and the sintering window of the powder material is narrow. And equipment requirements are strict, improper control of sintering temperature will lead to difficult control of powder melting during sintering process or parts warping and deformation due to internal stress, thus affecting the quality of SLS parts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Add 100g of nylon 12 pellets and 1000g of water into the reaction kettle, pressurize to 0.8MPa, raise the temperature to 120°C, stir for 5 hours, then take out the materials and vacuum dry them to obtain heat-treated nylon pellets;

[0016] Add 80g of nylon pellets obtained by heat treatment, 0.1g of crystallization aid, and 2000g of DMF into the reactor, pressurize to 0.8MPa, raise the temperature to 160°C, stir and ultrasonically disperse the material evenly for 1h, then lower the temperature and reduce pressure to normal temperature and normal temperature. Press, precipitate powder, filter, wash and dry to obtain nylon powder;

[0017] Take 50g of nylon powder obtained in the previous step, as well as 0.1g of flow aid and 0.1g of antioxidant, stir and mix in a vertical mixer for 1h, and pass through a 150-mesh sieve after the materials are evenly mixed to obtain nylon powder for selective laser sintering .

Embodiment 2

[0019] Add 500g of nylon 12 pellets and 2500g of water into the reaction kettle, pressurize to 1.5MPa, raise the temperature to 130°C, stir for 4 hours, then take out the material for vacuum drying to obtain heat-treated nylon pellets;

[0020] Add 300g of nylon pellets obtained by heat treatment, 0.5g of crystallization aids, and 3000g of DMA into the reaction kettle, pressurize to 1MPa, heat up to 170°C, stir and ultrasonically disperse the material for 2 hours, then lower the temperature and reduce pressure to normal temperature and pressure , precipitate powder, filter, wash and dry to obtain nylon powder;

[0021] Take 200g of the nylon powder obtained in the previous step, as well as 0.2g of flow aid and 0.5g of antioxidant, stir and mix in a vertical mixer for 1h, and pass through a 150-mesh sieve after the materials are evenly mixed to obtain nylon powder for selective laser sintering .

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Abstract

The invention provides a method for preparing nylon powder for selective laser sintering. The method is used for preparing nylon powder materials by steps of heat treatment, powder preparation in a solvent method, addition of an appropriate addition agent and the like, wherein the nylon powder materials have excellent performances and can be effectively applied to a selective laser sintering (SLS for short) process for preparing SLS pieces. The method has simple and convenient process, is environmental friendly and is easy to implement.

Description

technical field [0001] The invention relates to a method for preparing nylon powder, in particular to a method for preparing nylon powder for selective laser sintering. Background technique [0002] Selective Laser Sintering (SLS) is one of the most widely used rapid prototyping technologies at present. It uses solid powder as raw material and adopts the layering-superposition principle to directly manufacture three-dimensional entities from CAD models. Theoretically, any Powders whose viscosity decreases when heated can be used as SLS sintering materials, and a wide range of materials is one of the important factors for the SLS process to be widely used in various fields. Nylon is a crystalline polymer, and its SLS parts have excellent properties in terms of strength and density. It is a polymer material very suitable for SLS technology. Solvent precipitation method is one of the most widely used methods for preparing nylon powder at present. It is to dissolve nylon in a s...

Claims

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Application Information

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IPC IPC(8): C08L77/02C08L77/06C08K3/34C08K3/36C08K3/22C08K5/13C08K5/20C08K5/526C08J3/12
Inventor 许小曙边宏陈礼
Owner HUNAN FARSOON HIGH TECH CO LTD
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