High-flowability plastic composite powder material and preparation method thereof

Abstract

The invention discloses a high-flowability plastic composite powder material and a preparation method thereof. The composite powder material comprises a plastic matrix material and a fiber-reinforced component, wherein the plastic matrix material is one or more selected from polypropylene (PP), ABS (Acrylonitrile Butadiene Styrene), polyamide, polyimide, poly(aryl ether ketone), polyether sulfone, polyphenylene sulfide and polytetrafluoroethylene; the fiber-reinforced component is one or more selected from glass fiber, carbon fiber, carbon fiber powder, mineral fiber powder, aramid fiber, ceramic fiber and boron fiber; the additive amount of the fiber-reinforced component is 0.01-30%, and the volume fraction of the fiber-reinforced component is 0-40%. According to the preparation method, firstly, the fiber-reinforced component is subjected to coupling modification, and then, the modified fiber-reinforced component is mixed with a plastic powder matrix to obtain the composite powder material, so that the flowability of the plastic powder is enhanced, the laser energy absorption efficiency of the plastic powder is improved, the powder packing density is also increased, and the mechanical performance and heat stability of a sintered material are enhanced. The high-flowability plastic composite powder material is wide in material source, simple in preparation process and very remarkable in effect.

Description

technical field [0001] The invention belongs to the field of plastic composite materials, and relates to a high-fluidity plastic composite powder material and a preparation method thereof. Background technique [0002] Rapid additive manufacturing technology, also known as "3D printing technology", is a new manufacturing technology that is currently receiving high attention. Together with robotics and artificial intelligence, it is called the key technology to promote the third industrial revolution. Selective laser sintering (SLS) is a very important technology in 3D printing. The SLS process is based on the principle of discrete / stacking forming, integrating new technologies such as computer, numerical control, laser and new materials, and selectively sintering metal or non-metal powder materials to quickly prepare products. The laser power required for polymer SLS sintering is small and not limited by the complexity of the shape of the part. It can accurately and quickly...

AI Technical Summary

Problems solved by technology

[0003] The energy used for plastic molding is CO2 laser. During the molding process, the laser high-energy light speed is used to selectively scan the material. The laser energy absorbed by the powder material collides with the basic energy particles inside the powder material through laser photons, so that the temperature of the material after absorbing light energy Raise, the energy is converted into heat energy in a very short moment and gradually transferred to the inside; the laser beam with sufficient power density quickly heats the surface of the material to make it reach the desired temperature and melt, and the heat is transferred in the powder after melting; but The inside of the material is basically kept in a cooling state, mainly because the energy emitted by the laser beam cannot be completely absorbed by the plastic material, and part of the light energy is reflected by the surface of the material, resulting in a low laser power density radiated to the surface of the material