Graphene/polypropylene composite powder material for SLS and preparation method

A composite powder, polypropylene technology, applied in the direction of additive processing, etc., can solve the problem of low performance of polypropylene SLS parts, and achieve the effects of good fluidity, high precision, and reduced harmfulness

Active Publication Date: 2016-11-23
GUANGDONG SILVER AGE SCI & TECH CO LTD
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Problems solved by technology

[0005] Aiming at the above defects or improvement needs of the prior art, the invention provides a graphene / polypropylene composite powder material for selective laser sintering (SLS) and a preparation method thereof, which uses a solution blending evaporation method to convert graphite The olefin is uniformly dispersed in the polypropylene matrix, and the prepared composite powder material has good fluidity, suitable particle size and particle size distribution, and excellent sintering performance. It is suitable for the laser selective sintering process, and the performance of the product is also improved. Solve the technical problem of low performance of current polypropylene SLS parts

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  • Graphene/polypropylene composite powder material for SLS and preparation method
  • Graphene/polypropylene composite powder material for SLS and preparation method
  • Graphene/polypropylene composite powder material for SLS and preparation method

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preparation example Construction

[0030] A method for preparing a graphene / polypropylene nanocomposite powder material for laser selective sintering of the present invention, which uses a surfactant to disperse the graphene in water by ultrasonic treatment, and gradually disperses the PP powder in a small amount while stirring the solution vigorously. Adding it into the solution, heating and volatilizing, and finally pulverizing, drying and sieving the obtained powder aggregates to obtain a composite powder material, which includes the following steps:

[0031] (1) Add graphite flakes into the mixed solution of concentrated sulfuric acid and nitric acid, stir for 16 hours, wash the solution repeatedly with deionized water until neutral, then place the solution at a temperature of 100°C and vacuum-dry it to constant weight. Heat treatment for 15s to obtain expanded graphite, put the expanded graphite into 70vol% ethanol aqueous solution, sonicate at a frequency of 50HZ for 8h, filter and dry in vacuum at 100°C t...

example 1

[0045] Example 1: (graphene mass fraction is the graphene / polypropylene composite powder of 0.5wt%)

[0046] (1) Add 1 g of graphite flakes into the mixed solution of concentrated sulfuric acid and nitric acid, stir for 16 hours, wash the solution repeatedly with deionized water until neutral, then place the solution at a temperature of 100°C to vacuum dry to a constant weight, and at 1050°C Heat treatment for 15s to obtain expanded graphite, put the expanded graphite into 70vol% ethanol aqueous solution, sonicate at a frequency of 50HZ for 8h, filter and vacuum-dry at 100°C to constant weight to obtain the product graphene oxide GO.

[0047] (2) Take out 0.1g of graphene oxide GO obtained in step (1), uniformly disperse in 20vol% ethanol aqueous solution, ultrasonically treat at a frequency of 50HZ and vigorously stir at a speed of 450r / min, with a speed of 4g / s Slowly add 0.4g of γ-aminopropyltriethoxysilane (KH550) to the above solution, keep it at 75°C for 24h, filter it w...

example 2

[0051] Example 2: (graphene mass fraction is the graphene / polypropylene composite powder of 6wt%)

[0052] (1) Add 50g of graphite flakes into the mixed solution of concentrated sulfuric acid and nitric acid, stir for 16 hours, wash the solution repeatedly with deionized water until neutral, then place the solution at a temperature of 100°C to vacuum-dry to constant weight, and at 1050°C Heat treatment for 15s to obtain expanded graphite, put the expanded graphite into 70vol% ethanol aqueous solution, sonicate at a frequency of 50HZ for 8h, filter and vacuum-dry at 100°C to constant weight to obtain the product graphene oxide GO.

[0053] (2) Take out 30g of graphene oxide GO obtained in step (1), uniformly disperse in 10vol% ethanol aqueous solution, ultrasonicate at a frequency of 50HZ and vigorously stir at a speed of 300r / min, at a speed of 2g / s Slowly add 120g of N-(β-aminoethyl)-γ-aminopropyltriethoxysilane (KH901) to the above solution, keep at 80°C for 20h, filter with...

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Abstract

The invention provides a graphene / polypropylene composite powder material for SLS and a preparation method. The preparation method of the composite powder material comprises the following steps: performing oxidation and surface functionalization of graphene; uniformly dispersing the graphene after the surface functionalization into an aqueous solution; adding polypropylene powder, and stirring vigorously; performing rotary heating for evaporation; and drying, grinding and sieving to obtain the composite powder material. According to the invention, the graphene is uniformly dispersed into the solution by adopting a liquid-phase dispersion method, and then the graphene is uniformly dispersed into high-molecular matrix polypropylene in later solution volatilization process; and the prepared composite material has the advantages of uniform form, appropriate particle size and good fluidity and facilitates the powder laying and laser sintering process of the SLS technology.

Description

technical field [0001] The invention belongs to the field of polymer material preparation, and more specifically relates to a graphene / polypropylene composite powder material for SLS and a preparation method. Background technique [0002] Selective Laser Sintering (SLS) is an additive manufacturing technology (Additive Manufacturing, AM), which uses computer-aided design and manufacturing, and adopts the principle of layered manufacturing superposition to directly form solid powder into three-dimensional solid parts. This technology has the advantages of a wide range of applicable materials, no support and high forming precision, and is widely used in many fields such as aerospace and automobile industries. Usually, the forming characteristics of SLS without external driving force determine that there will be some holes inside the formed parts, resulting in its mechanical properties (such as strength, toughness and fatigue resistance, etc.) generally lower than traditional m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/12C08L23/12C08K9/06C08K9/02C08K3/04B33Y70/00
CPCB33Y70/00C08J3/12C08J2323/12C08K3/04C08K9/02C08K9/06C08L23/12
Inventor 闫春泽杨家懿朱伟史玉升傅轶汪艳魏青松
Owner GUANGDONG SILVER AGE SCI & TECH CO LTD
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