FIELD: chemistry.
SUBSTANCE: invention relates to a polypropylene composition which is powder for 3D printing, which can be used to produce articles by selective laser sintering (SLS) or powder bed fusion (PBF). Polypropylene composition in form of powder for making articles by 3D printing using selective laser sintering technology contains: A - propylene homopolymer with MFR 230 °C/2.16 kg in range from 3 to 50 g/10 min, B is a nucleating additive, in the capacity of which organic compounds are used, which are alpha- or beta-nucleators of polypropylene, where the polypropylene composition is a powder characterized by particle size distribution: D10 = 30–45 mcm, D50 = 50–65 mcm, D90 = 70–85 mcm and powder particles sphericity and roundness indices of not less than 0.80 standard units. After surface treatment of the powder with a complex of additives, which includes stabilizing agents, which are antioxidants of a phenol nature in a mixture with processing stabilizers of a phosphite nature, antistatic and separating additives, powder is characterized by bulk density from 0.35 to 0.48 g/cm3. Invention also relates to a method of producing a polypropylene composition, use thereof and an article made therefrom.
EFFECT: obtaining polypropylene powder with a spherical and/or spheroidal shape of particles and a certain particle size distribution in the ranges D10 = 30–45 mcm, D50 = 50–65 mcm, D90 = 70–85 mcm, which provides the required fluidity and bulk density of powder from 0,35 to 0,48 g/cm3 after surface treatment of the powder with a complex of additives, including stabilizing, antistatic and separating additives, and the possibility of its effective use in process of 3D printing by the SLS method.
40 cl, 7 dwg, 2 tbl, 14 ex
