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Powder material for selective laser sintering and preparation method thereof

A technology of laser sintering and powder materials, applied in coating and other directions, can solve problems such as unfavorable powder spreading and precision of formed parts, preparation methods need to be improved, irregular shapes, etc., to achieve energy saving in preparation process, high powder sphericity, continuous production effect

Inactive Publication Date: 2016-10-05
HEFEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The powder material prepared by this method has good dispersion uniformity and can be used for selective laser sintering. However, since the powder is prepared by cryogenic powder, the shape is extremely irregular, which is not conducive to the improvement of powder spreading and forming precision.
[0007] Therefore, the existing powder materials for selective laser sintering and their preparation methods need to be improved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A polyamide / zinc oxide composite powder for selective laser sintering, the preparation method of which is as follows:

[0040] (1) Filler surface treatment: select 44.1 grams of zinc oxide and stir and dry at 200 ° C. The particle size of zinc oxide is 0.01-0.1 microns. Stir and heat 17.7 grams of silane coupling agent and dried zinc oxide in a high mixer Activation, the stirring time is 5 minutes, and the stirring temperature is 100°C;

[0041] (2) Blending of raw materials: Add 0.9 gram of butyl stearate dispersant, 26.5 gram of 1,3,5-trimethyl-2,4,6-tri(3,5) to the zinc oxide after surface treatment successively - Di-tert-butyl-4-hydroxybenzyl) benzene antioxidant, 0.4 g 2,4-dihydroxybenzophenone light absorber, 17.7 g pentaerythritol stearate lubricant, 0.9 g PE-g-ST Compatibilizer and 794.3 grams of polyamide, and mix homogeneously in high mixer, stirring time is 15 minutes;

[0042] (3) Mixing of raw materials: Put the blended powder of zinc oxide, polyamide and...

Embodiment 2

[0048] A composite powder for selective laser sintering of ethylene-vinyl acetate copolymer / glass fiber, its preparation method is as follows:

[0049] (1) Filler surface treatment: select 813.6 grams of glass fiber and stir and dry at 60°C. The length of the glass fiber is 60-80 microns. Mix 67.8 grams of titanate coupling agent with the dried glass fiber in a high-mixer. Heat activation, the stirring time is 20 minutes, and the stirring temperature is 60°C;

[0050] (2) Blending of raw materials: Add 33.9 grams of higher fatty acid dispersant, 67.8 grams of 2,6-di-tert-butyl-4-methyl-phenol antioxidant, and 47.5 grams of 2-hydroxyl in the glass fiber after surface treatment. - 4-methoxybenzophenone light absorber, 67.8 grams of polyethylene wax lubricant, 54.2 grams of ABS-g-MAH compatibilizer and 4745.8 grams of ethylene-vinyl acetate copolymer and mixed in a high mixer Evenly, the stirring time is 80 minutes;

[0051] (3) Bulk mixing of raw materials: Put the powder afte...

Embodiment 3

[0057] A composite powder for selective laser sintering of acrylic acid / aluminum powder, the preparation method of which is as follows:

[0058] (1) Filler surface treatment: Select 6195.1 grams of aluminum powder, stir and dry at 60°C, the particle size of the aluminum powder is 50-80 microns, mix 6.9 grams of zirconium coupling agent and dried aluminum powder in a high mixer and heat Activation, the stirring time is 5 minutes, and the stirring temperature is 100°C;

[0059] (2) Blending of raw materials: 344.2 grams of hexenyl bis stearamide dispersant, 0.7 gram of N, N'-two (3,5-di-tert-butyl-4-hydroxyl) were added successively to the surface-treated aluminum powder Phenylpropionamide) antioxidant, 137.7 grams of 2-(2'-hydroxyl-3', 5'-di-tert-phenyl)-5-chlorinated benzotriazole light absorber, 0.7 gram of polypropylene wax lubricant , 344.2 grams of PP-g-ST compatibilizer and 699.3 grams of acrylic acid, and mixed uniformly in a high mixer, the stirring time is 15 minutes;...

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Abstract

The invention discloses a powder material for selective laser sintering and a preparation method thereof. The powder material is composed of, by weight, 10-90 parts of resin matrix, 5-90 parts of filler, 0.1-5 parts of coupling agent, 0.1-5 parts of dispersant, 0.1-5 parts of compatibilizer, 0.1-8 parts of flow promoting agent, 0.01-3 parts of antioxidant, 0.05-2 parts of light absorbing agent, 0.01-2 parts of lubricant and 0.05-4 parts of surfactant. The preparation method includes: treating the surface of the filler; blending raw materials; banburying the raw materials; powdering; spherifying powder; performing surface modification on the powder. Compared with the prior art, the powder material and the preparation method have the advantages that the preparation method is simple and supportive of continuous production; the preparation process is energy-saving, environment-friendly and pollution-free; resin in the powder material prepared by the method uniformly coats the surface of the filler, and the powder is high in sphericity and excellent in sintering performance.

Description

technical field [0001] The invention belongs to the field of material preparation in advanced rapid manufacturing, and in particular relates to a powder material for selective laser sintering and a preparation method thereof. Background technique [0002] With the help of computer-aided design and manufacturing, selective laser sintering uses laser scanning powder bed sintering to sinter powder directly into three-dimensional solid parts, which can be used to manufacture various models and functional parts including polymer materials, metal materials and ceramic materials. ,with broadly application foreground. For polymer materials, the performance of some aspects of polymer models and functional parts can be greatly improved by adding fillers, such as mechanical properties, heat resistance, etc., while the sintering temperature for metals, ceramics and some polymer materials is very high , it is difficult to use laser direct sintering. It is necessary to prepare a high me...

Claims

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Application Information

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IPC IPC(8): C08L77/00C08L23/08C08L33/02C08K13/06C08K9/06C08K9/04C08K3/22C08K7/14C08K3/08C08J3/12B29B9/12B29B9/16
CPCC08L77/00B29B9/12B29B9/16B29B2009/125B29B2009/166C08J3/128C08J2323/08C08J2333/02C08J2377/00C08J2451/06C08K2201/003C08L23/0853C08L33/02C08L2205/02C08L2205/03C08L51/06C08K13/06C08K9/06C08K2003/2296C08K5/101C08K5/103C08L23/06C08L55/02C08K9/04C08K7/14C08K5/09C08K5/13C08L33/12C08K2003/0812C08K5/20C08K5/3475
Inventor 丁明赵娣芳黄俊俊李明华韩成良谢劲松李梦雨刘琦
Owner HEFEI UNIV
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