METHOD OF PRODUCING POLYMER-BASED NEUTRON-PROTECTIVE MATERIAL Russian patent published in 2021 - IPC C08K3/38 C08J3/12 C08J3/20 C08L23/06 B29B9/10 G21F1/10 

FIELD: powder material production.

SUBSTANCE: invention relates to methods for manufacturing boron-containing neutron-protective composite powder material on a polymer basis in the form of spherical particles, intended for protection against neutron radiation, which can be used for uniform filling of hollow volumes of arbitrary geometry, including by pneumatic transportation through channels with small cross-sections. The present invention relates to a method for producing a polymer-based neutron-shielding material. This method consists in mixing the initial components - powdered high-pressure polyethylene of linear structure and a filler - boron nitride. Plasticizing the mixture in an extruder at a temperature above the melting point of the polymer. Granulation of the obtained plasticizer. Grinding the granules, followed by processing the resulting powder to give the particles a spherical shape. Boron nitride of natural isotopic composition is used as a filler. The ratio of the initial components, wt.%: high-pressure polyethylene of linear structure 70-80 and boron nitride of natural isotopic composition - 20-30. To give the powder particles a spherical shape, their surface is melted in an upward flow of heated air at a temperature of 380-500°С.

EFFECT: possibility of obtaining from boron nitride of natural isotopic composition and high-pressure polyethylene of the linear structure of a neutron-protective material in the form of a powder with spherical particles in the size range of 40-300 microns; the spherical shape of the particles provides the possibility of pneumatic transportation of neutron-protective material, including through channels with small cross-sections, and allows uniform filling of hollow volumes of different geometries.

1 cl, 2 dwg, 1 ex