Polymer powder material for selective laser sintering and preparation method thereof

A powder material, laser sintering technology, applied in the direction of additive processing, etc., can solve the problems of insufficient compactness of parts, affecting the performance of workpieces, low powder loose density, etc., to improve reusability, improve production efficiency, and excellent performance. Effect

Active Publication Date: 2022-04-15
湖南华曙新材料科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of mixing semi-finished polymer powder and additives, powder electrostatic problems will inevitably occur, which will reduce the bulk density and fluidity of the final polymer powder suitable for selective laser sintering.
During the selective laser sintering process, if the powder fluidity is poor, it will lead to powder cracking and powder throwing, which will lead to cracking or defects in the part, and will make the sintering process unable to continue; the loose density of the powder is low, and it is easy to appear Powder causes abnormal sintering, or the compactness of the workpiece is not enough, which affects the performance of the workpiece

Method used

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  • Polymer powder material for selective laser sintering and preparation method thereof
  • Polymer powder material for selective laser sintering and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Take 5kg of PA1212 powder with a particle size of 30-120μm, 0.5kg of phosphite antioxidant, and 0.2kg of nano-silicon dioxide into a high-speed mixer, and mix at a speed of 1200RPM for 3 minutes to prepare PA1212 powder. Add 95kg of PA1212 powder with a particle size of 30-120μm into a slow mixer, heat to 80°C, mix at a speed of 50RPM, weigh 0.5kg of water, divide it into 5 parts, each part is 0.1kg, start timing from stirring, Spray the prepared water into the material of the slow-speed mixer every 10 minutes until all the water is added, continue to heat and maintain 80 ° C, stir and mix for 3 hours, and prepare PA1212 powder material, and measure the bulk density of the powder and The angle of repose was printed on the Farsoon HT252 equipment to test the performance of the printed spline.

Embodiment 2

[0025] Take 5kg of PA1212 powder with a particle size of 30-120μm, 0.5kg of phosphite antioxidant, and 0.2kg of nano-silicon dioxide into a high-speed mixer, and mix at a speed of 1200RPM for 3 minutes to prepare PA1212 powder. Add 65kg of PA1212 powder with a particle size of 30-120μm and 30kg of solid glass beads with a particle size of 5-30μm into a slow mixer, heat to 80°C, mix at a speed of 50RPM, weigh 0.5kg of water, divide into 5 parts, each 0.1kg, start timing from stirring, spray the prepared water into the material of the slow mixer every 10 minutes until all the water is added, continue to heat and maintain 80 ° C, stir and mix for 3 hours, The PA1212 powder material was prepared, the bulk density and angle of repose of the powder were measured, and printed on Farsoon Hi-Tech HT252 equipment to test the performance of the printed sample.

Embodiment 3

[0029] Take 5kg of PP powder with a particle size of 30-120μm, 0.5kg of phosphite antioxidant, and 0.2kg of nano-silicon dioxide into a high-speed mixer, and mix at a speed of 1200RPM for 3 minutes to prepare PP powder. Add 95kg of PP powder with a particle size of 30-120μm into a slow mixer, heat to 80°C, mix at a speed of 50RPM, weigh 0.5kg of water, divide it into 5 parts, each part is 0.1kg, start timing from stirring, Spray the prepared water into the material of the slow mixer every 10 minutes until all the water is added, continue to heat and maintain 80°C, stir and mix for 3 hours to prepare PP powder materials, and measure the powder bulk density and The angle of repose was printed on the Farsoon HT252 equipment to test the performance of the printed spline.

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Abstract

The invention provides a preparation method of a high-molecular powder material for selective laser sintering, which comprises the following steps: adding 1-20 parts by mass of high-molecular powder and a powder additive into a high-speed stirrer, and preparing high-molecular powder lead powder through a high-speed stirring process, and adding the polymer powder guide powder, 50-99 parts by mass of polymer powder and 0-30 parts by mass of powder filler into a low-speed mixer, heating to 60-120 DEG C, continuously preserving heat, and preparing the polymer powder material through a low-speed stirring process, starting from slow stirring, spraying a part of water into the mixed powder in the stirrer at set time intervals by adopting a spraying method until the water with the set mass is completely used up, and continuously stirring and mixing until the stirring time reaches the set time, so as to obtain the polymer powder material. The polymer powder material has the advantages of high apparent density and good fluidity.

Description

technical field [0001] The invention belongs to the technical field of selective laser sintering, and relates to a polymer powder material for selective laser sintering and a preparation method thereof. Background technique [0002] Selective laser sintering is a method of manufacturing three-dimensional objects by selectively fusing multiple layers of powder, which allows machining without tools but only by laser sintering multiple overlapping layers of powder according to the three-dimensional image of the object to be produced, to get a 3D solid. Patents US6136948 and WO9606881 describe this method of manufacturing three-dimensional objects using powdered polymers in detail. [0003] Polymer powder material is the main raw material of selective laser sintering technology. The bulk density and fluidity of the powder determine the stability of the processing process, and also have an important impact on the surface quality and mechanical properties of the sintered part. I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/22C08L77/06C08L23/12C08L75/04C08L81/02C08L67/02C08K3/36C08K7/20B33Y70/10
CPCY02P10/25
Inventor 谭锐钟英俊谭博陈亮斌
Owner 湖南华曙新材料科技有限责任公司
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