Carbon nanotube/polypropylene composite powder material and preparation method for sls

A carbon nanotube composite and carbon nanotube technology, applied in the direction of additive processing, can solve the problems of irregular composite powder morphology, affecting the performance of SLS parts, and inability to uniformly disperse nano-fillers, and achieve good laser absorption rate. and thermal conductivity, improved laser sintering performance, good heat transfer effect

Active Publication Date: 2020-08-04
GUANGDONG SILVER AGE SCI & TECH CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

This method has the advantages of simple process and low cost, but it cannot uniformly disperse nanofillers in the polymer matrix; 2) Melt extrusion + low temperature pulverization (application number 201410544610.8), that is, polymer particles and nanofillers in a certain proportion Mixed, twin-screw extruded, granulated, and then pulverized at low temperature
This method can uniformly disperse nanomaterials in the polymer matrix, but the shape of the obtained composite powder is irregular, which affects the performance of SLS parts

Method used

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  • Carbon nanotube/polypropylene composite powder material and preparation method for sls
  • Carbon nanotube/polypropylene composite powder material and preparation method for sls

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preparation example Construction

[0032] A method for preparing carbon nanotube / polypropylene composite powder for selective laser sintering provided by the present invention comprises the following steps:

[0033] 1) carbon nanotube grafted maleic anhydride treatment

[0034] Put hydroxylated carbon nanotubes, solvent ethyl acetate, maleic anhydride and catalyst perchloric acid into a three-necked flask at a ratio of 0.1g: 100mL: 1g: 10mL, use an ultrasonic disperser such as a bath type, and disperse ultrasonically in a water bath for 40 minutes , power 40-120W, then stirred and condensed and refluxed at 60°C for 4h at a stirring speed of 100-300rpm, filtered the product, washed with deionized water until neutral, and vacuum-dried at 50°C to constant weight.

[0035] The above-mentioned carbon nanotubes are hydroxylated multi-walled carbon nanotubes, the hydroxyl content is 1-5 wt%, and the purity is >95%.

[0036] 2) Composite polypropylene powder and carbon nanotubes

[0037]First, use an ultrasonic dispe...

Embodiment 1

[0043] Embodiment 1: (the carbon nanotube mass fraction is the carbon nanotube / polypropylene composite powder of 0.1wt%)

[0044] 1) Put hydroxylated carbon nanotubes (1g), solvent ethyl acetate (1000mL), maleic anhydride (10g) and catalyst perchloric acid (100mL) into a three-necked flask, using an ultrasonic disperser (bath type), water bath Ultrasonic dispersion for 40min, power 40W; then stirring and condensing at 60°C for reflux for 4h at a stirring speed of 100rpm, the product was filtered, washed with deionized water, and vacuum-dried at 50°C to a constant weight state.

[0045] 2) Use an ultrasonic disperser (Tip type) to uniformly disperse the above 1g nanotubes in absolute ethanol, the concentration of carbon nanotubes is 1:5g / L, the power is 100W, and the ultrasonic treatment time is 30min; the particle size of 993g is 10μm polypropylene powder is slowly poured into the dispersed carbon nanotube solution at a speed of 6g / s, while stirring rapidly with a mechanical s...

Embodiment 2

[0048] Embodiment 2: (the carbon nanotube mass fraction is the carbon nanotube / polypropylene composite powder of 1wt%)

[0049] 1) Put hydroxylated carbon nanotubes (10g), solvent ethyl acetate (10000mL), maleic anhydride (100g) and catalyst perchloric acid (1000mL) into a three-necked flask, using an ultrasonic disperser (bath type), water bath Ultrasonic dispersion for 40min, power 80W; then stirring and condensing at 60°C for reflux for 4h at a stirring speed of 200rpm, filtering the product, washing with deionized water, and vacuum drying at 50°C;

[0050] 2) Use an ultrasonic disperser (Tip type) to uniformly disperse 10g of the above-mentioned carbon nanotubes in absolute ethanol, the concentration of carbon nanotubes is 1:2.5g / L, the power is 150W, and the ultrasonic treatment time is 30min; The polypropylene powder with a diameter of 90 μm is slowly poured into the dispersed carbon nanotube solution at a speed of 4 g / s, and at the same time, it is stirred rapidly by a ...

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Abstract

The invention discloses a composite carbon nanotube / polypropylene powder material for SLS (selective laser sintering) and a preparation method thereof. The composite carbon nano tube / polypropylene powder material comprises polypropylene, carbon nanotubes, an initiating agent and antioxidant. The preparation method includes the steps of grafting the carbon nanotubes to maleic anhydride for treatment, compositing polypropylene powder with the carbon nanotubes, and mixing the composite carbon nanotube / polypropylene powder with the initiating agent and the antioxidant. The composite carbon nanotube / polypropylene powder material has the advantages that high laser absorptivity and high thermal conductivity are obtained, and laser sintering performance of the polypropylene powder is improved remarkably; the preparation method has the advantages that uniform dispersion and excellent interface bonding of the carbon nanotubes in a polypropylene matrix are achieved, and overall performance of SLS workpieces are improved effectively.

Description

technical field [0001] The invention belongs to the field of polymer nanocomposite materials, and more specifically relates to a carbon nanotube / polypropylene composite powder material for SLS and a preparation method thereof. Background technique [0002] Selective Laser Sintering (SLS) uses computer-aided design and manufacturing, and adopts the principle of layered manufacturing superposition to directly form solid powder into three-dimensional solid parts. Due to the advantages of low forming temperature and low laser power required for sintering, polymer materials have become the most widely used and most successful SLS materials. With the development of SLS technology from the original shape-only prototype to the direct manufacture of functional parts, the types and properties of the existing SLS polymer materials are far from meeting the needs of most products. Therefore, the development of more high-performance, multi-variety polymers and their composite materials h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/12C08K9/04C08K9/02C08K7/24C08J3/12B33Y70/00
CPCB33Y70/00C08J3/12C08J2323/12C08K7/24C08K9/02C08K9/04C08K2201/011C08L23/12
Inventor 闫春泽朱伟杨家懿史玉升傅轶汪艳魏青松
Owner GUANGDONG SILVER AGE SCI & TECH CO LTD
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