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A kind of preparation method of nylon conductive powder for laser sintering

A conductive powder and laser sintering technology, which is applied in the field of nylon conductive powder preparation for laser sintering, can solve the problems of three-dimensional parts affecting the electrical conductivity and other properties, separation, easy delamination, etc., and achieve good electrical conductivity and other related properties without difficulty Effect of phase separation and concentration of particle size distribution

Active Publication Date: 2019-12-10
HUNAN FARSOON HIGH TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Selective laser sintering conductive nylon composite powder with mechanical mixing is easy to cause phase separation due to the different properties of conductive powder particles and nylon particles. During use, especially during the powder laying process, different materials are easy to delaminate, resulting in three-dimensional parts. Affects its conductivity and other properties due to unevenness

Method used

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  • A kind of preparation method of nylon conductive powder for laser sintering

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Effect test

Embodiment 1

[0023] Take 1000 g of copper with an average particle size of 5 microns and 500 g of an alcohol-water solution of potassium dodecyl phosphate, stir and mix evenly, filter, dry at 60°C for 4 hours, ball mill and sieve to obtain surface-activated copper powder; The composition and mass percentage of the alcohol-water solution of potassium dodecyl phosphate are: 85% ethanol, 10% distilled water, and 5% potassium dodecyl phosphate. Put 10Kg of PA1212 material, 100g of surface-activated copper powder, 80Kg of ethanol into the 100L reaction kettle, feed high-purity nitrogen gas to a pressure of 0.3MPa, continue to stir under heating to raise the temperature in the kettle to 150°C, and keep warm at this temperature 120min; then use cooling water to cool down, make the temperature in the kettle drop to 75°C at a cooling rate of 0.8°C / min, increase the cooling water flow to make the temperature in the kettle drop to room temperature, take out the material, centrifuge, and dry to obtain ...

Embodiment 2

[0027] Take 1000 g of silver with an average particle size of 5 microns and 500 g of an alcohol-water solution of potassium dodecyl phosphate, stir and mix evenly, filter, dry at 60°C for 4 hours, ball mill and sieve to obtain surface-activated silver powder; The composition and mass percentage of the alcohol-water solution of potassium dialkyl phosphate are: 85% ethanol, 10% distilled water, and 5% potassium dodecyl phosphate. Put 10Kg of PA1212 material, 100g of surface-activated silver powder, 80Kg of ethanol into the 100L reaction kettle, feed high-purity nitrogen to the pressure of 0.3MPa, continue to stir under heating to raise the temperature in the kettle to 150°C, and keep at this temperature for 120min Then use cooling water to cool down, make the temperature in the kettle drop to 75°C at a cooling rate of 0.8°C / min, increase the cooling water flow to make the temperature in the kettle drop to room temperature, take out the material, centrifuge, and dry to get the nyl...

Embodiment 3

[0029] Take 1000 g of graphene with an average particle size of 5 microns and 500 g of an alcohol-water solution of potassium dodecyl phosphate, stir and mix evenly, filter, dry at 60 ° C for 4 hours, ball mill and sieve to obtain surface-activated graphene powder ; The composition and mass percentage of the alcohol-water solution of potassium dodecyl phosphate are: 85% ethanol, 10% distilled water, and 5% potassium dodecyl phosphate. Put into the 100L reaction kettle 10Kg of PA1212 material, 100g of surface-activated graphene, 80Kg of ethanol, feed high-purity nitrogen to a pressure of 0.3MPa, continue to stir under heating to make the temperature in the kettle rise to 150°C, and keep warm at this temperature 120min; then use cooling water to cool down, make the temperature in the kettle drop to 75°C at a cooling rate of 0.8°C / min, increase the cooling water flow to make the temperature in the kettle drop to room temperature, take out the material, centrifuge, and dry to obtai...

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Abstract

The invention provides a nylon conductive powder preparation method for laser sintering. The nylon conductive powder preparation method comprises the following steps: adding conductive particles and a surfactant into an alcohol-water solvent; stirring, dispersing, drying and grinding to obtain surface-activated conductive particles; then, adding the surface-activated conductive particles into a nylon solution; heating, cooling and crystalizing; uniformly coating the inside of the nylon microspheres with the conductive particles, filtering, drying and screening to obtain a nylon powder material coated with the conductive particles. By adopting the nylon conductive powder preparation method, the prepared nylon conductive powder has uniform and concentrated particle size distribution, the conductive particles are distributed more uniformly, the powder is prevented from being separated easily in a using process, and the conductive performance and other relevant performance of nylon three-dimensional parts are improved.

Description

technical field [0001] The invention relates to a method for preparing nylon conductive powder for laser sintering. The nylon conductive powder prepared by the method is especially suitable for selective laser sintering technology, and the prepared three-dimensional parts have the characteristics of nylon material and have conductive properties. 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 tooling but simply by laser sintering multiple overlapping layers of powder according to a three-dimensional image of the object to be produced, to obtain 3D solids. This method is mainly accomplished using thermoplastic polymers, and the method of manufacturing three-dimensional objects using powdered polymers is described in detail in patents US6136948 and WO9606881. [0003] Nylon is a kind of thermoplastic engineering plastics with excellent...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L77/06C08L77/02C08K9/04C08K3/04C08K3/08
CPCC08K3/04C08K3/08C08K9/04C08K2003/0806C08K2003/085C08K2201/001C08K2201/003C08L77/06C08L77/02
Inventor 谭锐彭博罗秋帆陈礼
Owner HUNAN FARSOON HIGH TECH CO LTD