METHOD OF PRODUCING POLYMER-BASED NEUTRON-PROTECTIVE MATERIAL Russian patent published in 2020 - IPC C08J3/12 C08J3/20 C08L23/06 C08K3/38 B29B9/10 G21F1/10 

FIELD: chemistry.

SUBSTANCE: invention relates to production of boron-containing polymer-based composite material in form of particles of spherical shape, intended for protection against neutron radiation, which can be used for uniform filling of hollow volumes of arbitrary geometry, including by means of pneumatic conveying on channels with small cross sections. Method involves mixing initial components - polyethylene and boron nitride with subsequent plasticisation of the mixture in an extruder at a temperature higher than the melting point of the polymer. As initial components there used are powdery high-pressure polyethylene of linear structure in amount of 90–93 wt. % and boron nitride hexagonal, enriched in isotope boron-10, in amount of 7–10 wt. %, and after plasticisation, the obtained extrudate is granulated, the granules are ground and the obtained powder is treated to impart a spherical shape to the particles by melting their surface in the flame of the gas burner at temperature of 600–800 °C.

EFFECT: technical result: neutron-protective powder material with particles of spherical shape and specified fractional composition in range of sizes of 40–300 mcm; spherical shape of particles enables pneumatic conveying of neutron-protective material through channels with small cross sections; spherical shape of particles and preset fractional composition allow uniformly filling hollow volumes of different geometry.

3 cl, 2 ex, 4 dwg