3D printing powder and preparation method thereof

Abstract

The invention discloses flame-retardant function modified 3D printing powder which comprises the following components in parts by weight: 100 parts of polyamide and 1-30 parts of a flame retardant; wherein the particle size of the flame retardant is dispersed in a polyamide resin matrix in a form of less than 10 microns, and meanwhile, the 3D printing powder is uniform in particle size distribution, good in flowability and proper in stacking density. The 3D printing powder is prepared through a solution method, wherein the resin in new polyamide materials, waste materials and recycled materials is dissolved in a solvent system with phenol / methylbenzene as the main component, and a polyamide clear solution is obtained through decoloration (the step needed for treating the polyamide waste materials), filtering and purification, a flame retardant is added into the polyamide clear solution and the flame retardant is fully dissolved; and finally, the solution is jetted into deionized waterby a spraying method to obtain the modified 3D printing powder with regular particles, uniform particle size and good fluidity.

Description

technical field [0001] The invention relates to the technical field of green polymer materials, in particular to a 3D printing powder and a preparation method thereof. Background technique [0002] Compared with traditional technology, 3D printing technology has strong designability, simple process, low energy consumption, suitable for customized production, and can greatly shorten the production cycle from design to parts. field is widely used. For different application fields, 3D printing powders of different material types have been developed. Among polymer 3D printing powder materials, the research and application of polyamide 3D printing powder is one of the important research fields. [0003] At present, the methods for preparing polyamide 3D printing powder are mainly cryogenic pulverization combined with grinding. Patent CN107151441A, patent CN108017905A and other patents use cryogenic pulverization method to crush polyamide particles to obtain polyamide 3D printi...

AI Technical Summary

Problems solved by technology

[0006] In the existing technology, it is difficult to achieve uniform dispersion of flame retardants in 3D printing powders

Even if the flame retardant particles with a particle size of less than 5 microns are used, it is difficult to meet the above requirements, because these flame retardants will agglomerate and precipitate during the melting process, resulting in uneven distribution of the flame retardant in the resin matrix

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