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Nylon/graphene/carbon fiber composite powder and preparation method thereof, and application of composite powder to selective laser sintering technology

A composite powder, graphene technology, applied in chemical instruments and methods, heat exchange materials, additive processing, etc., can solve the problems of limited application of molded parts, poor electrical and thermal conductivity, etc., to achieve low cost, improved mechanical properties, laser low power effect

Active Publication Date: 2018-04-20
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The molded parts obtained by the carbon fiber reinforced resin powder material through the SLS process have high strength and modulus, but the electrical and thermal conductivity is poor, which limits the application of the molded parts obtained by the SLS process in terms of electrical and thermal conductivity

Method used

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  • Nylon/graphene/carbon fiber composite powder and preparation method thereof, and application of composite powder to selective laser sintering technology
  • Nylon/graphene/carbon fiber composite powder and preparation method thereof, and application of composite powder to selective laser sintering technology
  • Nylon/graphene/carbon fiber composite powder and preparation method thereof, and application of composite powder to selective laser sintering technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] (1) First, the graphene is sieved through a sieving machine to obtain graphene powder with a particle size of 10-80 μm.

[0059] (2) Weigh 870g nylon 12 powder, 15g graphene powder, 100g carbon fiber powder, 10g fumed silica and 5g antioxidant 168.

[0060] (3) Graphene and hexadecanoyl amidopropyltrimethylammonium chloride are added in 100g n-propanol with the mass ratio of 1:1, ultrasonic vibration 2-4h, obtain modified graphene dispersion liquid;

[0061] (4) After adding 870g nylon to 4500g ethanol and ethanol bisstearamide (the quality of ethanol bisstearamide is 0.1% of the nylon quality) mixed solution, place it in an autoclave, and with the improved product obtained in step (3) Mix the graphene dispersion liquid evenly, add 0.05g vinyltriethoxysilane, feed nitrogen to pressurize to 1MPa, and stir at high speed (630rpm). Raise the temperature to 145°C and keep it warm for 1 hour until the nylon 12 is completely dissolved. After complete dissolution, the high pr...

Embodiment 2

[0086] (1) First, the graphene is sieved through a sieving machine to obtain graphene powder with a particle size of 10-80 μm.

[0087] (2) Weigh 955g nylon 12 powder, 15g graphene powder, 15g carbon fiber powder, 10g fumed silica and 5g antioxidant 168.

[0088] (3) Graphene and cetyl amidopropyltrimethylammonium chloride are added in 100g n-propanol with the mass ratio of 1:1, ultrasonic vibration 2-4h, obtain modified graphene dispersion liquid;

[0089] (4) After adding 955g nylon to 4500g ethanol and ethanol bis stearamide (the quality of ethanol bis stearamide is 0.1% of the nylon quality) mixed solution, place it in an autoclave, and with the improved product obtained in step (3) Mix the graphene dispersion liquid evenly, add 0.05g vinyltriethoxysilane, feed nitrogen to pressurize to 1MPa, and stir at high speed (630rpm). Raise the temperature to 145°C and keep it warm for 1 hour until the nylon 12 is completely dissolved. After complete dissolution, the high pressure...

Embodiment 3

[0094] (1) First, the graphene is sieved through a sieving machine to obtain graphene powder with a particle size of 10-80 μm.

[0095] (2) Weigh 860g nylon 12 powder, 25g graphene powder, 100g carbon fiber powder, 10g fumed silica and 5g antioxidant 168.

[0096] (3) Graphene and cetyl amidopropyltrimethylammonium chloride are added in 100g n-propanol with the mass ratio of 1:1, ultrasonic vibration 2-4h, obtain modified graphene dispersion liquid;

[0097] (4) After adding 860g nylon to 4500g ethanol and ethanol bisstearamide (the quality of ethanol bisstearamide is 0.1% of the nylon quality) mixed solution, place it in an autoclave, and with the modified product obtained in step (3) Mix the graphene dispersion liquid evenly, add 0.05g vinyltriethoxysilane, feed nitrogen to pressurize to 1MPa, and stir at high speed (630rpm). Raise the temperature to 145°C and keep it warm for 1 hour until the nylon 12 is completely dissolved. After complete dissolution, the high pressure ...

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Abstract

The invention discloses a nylon / graphene / carbon fiber composite powder and a preparation method thereof, and application of the composite powder to selective laser sintering technology. The preparation method comprises the following steps: subjecting nylon powder and graphene powder to double-liquid-phase mixing so as to prepare nylon / graphene composite powder; and then mechanically mixing the nylon / graphene composite powder with carbon fibers, a flow promoting agent and an antioxidant so as to obtain the nylon / graphene / carbon fiber composite powder. The invention provides the preparation method for the nylon / graphene / carbon fiber composite powder. A laser-sintered member prepared from the nylon / graphene / carbon fiber composite powder through selective laser sintering has good conductivity,good thermal conductivity and excellent mechanical properties.

Description

technical field [0001] The invention relates to the field of selective laser sintering, in particular to a nylon / graphene / carbon fiber composite powder, a preparation method thereof and an application in selective laser sintering technology. Background technique [0002] Selective laser sintering (SLS), also known as selective laser sintering, appeared in the 1980s and is a 3D printing technology based on additive manufacturing. Its principle is to lay a layer of powder material (metal powder or non-metal powder) on the workbench in advance, and the laser is under the control of the computer to sinter the solid part of the powder according to the interface contour information, and then continue to circulate, layer by layer. This technology requires that the particle size distribution of the powder material is uniform and the fluidity is good, which is conducive to powder bed spreading. This type of molding method has the characteristics of simple manufacturing process, high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/02C08K13/06C08K9/04C08K3/04C08K7/06C08K5/5425C08K3/36C08K5/526B33Y70/00C09K5/14
CPCB33Y70/00C08K3/04C08K3/36C08K5/526C08K5/5425C08K7/06C08K9/04C08K13/06C09K5/14C08L77/02
Inventor 张建飞郭建军许高杰陈晓敏黄志杰郑京连
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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