Polypropylene powder product for selective laser sintering and preparation method of polypropylene powder product

Abstract

The invention provides a polypropylene powder product for selective laser sintering and a preparation method of the polypropylene powder product. Polypropylene powder has narrow particle size distribution, high sphericity and good fluidity, has no warping deformation after selective laser printing, and has excellent performance of selective laser sintering and high forming accuracy. Printing of hollow glass bead filled polypropylene powder is implemented by using a selective laser sintering process, hollow glass beads in the obtained part are not crushed, the density of the part can be greatlyreduced, and lightweight of a material can be effectively achieved; by using a coupling agent and a compatibilizer provided by the invention, the compatibility between the hollow glass beads and polypropylene can be well improved; and due to a special powder mixing process, the hollow glass beads can be tightly combined with the polypropylene after laser sintering, mechanical properties, particularly the rigidity, can be greatly improved, and the polypropylene powder product has great application values in the field of mechanical parts.

Description

technical field [0001] The invention relates to the field of polymer material science, in particular to a polypropylene powder product for selective laser sintering and a preparation method thereof. Background technique [0002] 3D printing technology, also known as additive manufacturing technology, involves many aspects such as materials science, informatics, and precision mechanical engineering. It is a "manufacturing technology with industrial revolution significance" and has very strong competitiveness in modern manufacturing. At this stage, according to different raw materials and manufacturing methods, 3D printing technology is divided into multiple specific processes such as fused deposition modeling, selective laser sintering, and stereolithography. The application of 3D printing technology has greatly expanded the method of material forming, eliminated the waste of materials in traditional subtractive processes, and can quickly manufacture three-dimensional solid p...

AI Technical Summary

Problems solved by technology

As for the lightweight of materials, the traditional solution is to reduce the mineral content to reduce the material density. Mineral filling can improve the rigidity of the material, and the reduction of its content will lead to the attenuation of the mechanical properties of the material while reducing the weight, which will bring risks to automobile safety.

Hollow glass microspheres have a hollow structure, and filling them in the material can significantly reduce the overall density of the material. However, when produced by the traditional twin-screw mixing process, the fragile walls of hollow glass microspheres are easily squeezed and broken, and the density cannot be reduced. thereby reducing the weight of the material

In addition, the polarity of hollow glass microspheres is different from that of PP, so the compatibility is poor, and the bonding is not strong, which leads to the insignificant improvement of material performance.

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