METHOD OF ENCAPSULATING SUBMICRON PARTICLES WITH POLYMER AND DEVICE FOR IMPLEMENTATION THEREOF Russian patent published in 2022 - IPC B01J13/04 C08J3/12 C08J3/28 B05D1/04 

FIELD: chemistry.

SUBSTANCE: group of inventions relates to material science, specifically to a method and a device for encapsulating submicron particles, and can be used both for producing filler polymer composite materials, and encapsulated particles for medical purposes, agriculture, printing industry. Method of encapsulating submicron particles with a polymer includes forming a first two-phase flow of submicron particles by obtaining a stable suspension of submicron particles in a gas in a closed volume, to the inlet of which a carrier gas is supplied, and at the output of which a first two-phase flow of submicron particles is obtained, the temperature of which coincides with ambient temperature (18÷30) °C, and the flow rate of the first two-phase stream of submicron particles is set by changing the concentration of submicron particles in their suspension in the gas, simultaneously with the first two-phase stream of submicron particles, a second stream of monomer particles is formed, due to the fact that a liquid styrene monomer is used and styrene is evaporated by heating to the boiling point of the styrene monomer, and a second stream of fine styrene monomer particles is formed, the temperature of which is higher than the temperature of the submicron particles, then after charging, dispersing simultaneously submicron particles and particles of monomer, as well as deposition of fine monomer particles on the surface of submicron particles, a monomer layer is obtained on the surfaces of submicron particles in a mixing chamber made in the form of a truncated cone, monomer layer is obtained on surfaces of submicron particles, the required thickness of which is provided by selecting the flow rate of submicron particles, then submicron particles with a monomer layer on their surfaces are deposited in distilled water, the temperature of which is not lower than 85 °C and not more than 100 °C, and separating the encapsulated submicron particles from the reaction products and the carrier gas, then polymerising the styrene monomer on the surfaces of the submicron particles by mixing the resulting solution for at least 4 hours at temperature of 90 ± 5 °C and an aqueous suspension of submicron particles encapsulated with polystyrene is obtained. Device for encapsulating submicron particles with a polymer for implementing the method includes a carrier gas source, the output of which is connected to the input of the gas path, output of which is connected to a gas reducer, a reservoir for conglomerates of submicron particles, the output of which is connected to the input of the first discharge chamber, to the electrodes of which the output of the first controlled discharge current source is connected, second controlled discharge current source, the output of which is connected to electrodes of the second discharge chamber, the first and second inputs of which are connected to outputs of the first and second discharge chambers, respectively. Outlet of the gas path is connected to the inlet of the reservoir for conglomerates of submicron particles, the bottom of which is a membrane located at the base of the reservoir on the movable part of the electromagnet, to the inlet of which an oscillation generator with frequency control is connected and amplitude of oscillations, also comprises an evaporator for liquid monomer, to which a first controlled voltage source is connected, the outlet of the evaporator for liquid monomer is connected to the input of the second discharge chamber, and the outlet of the mixing chamber, made in the form of a truncated cone, facing the distilled water container with its smaller base, is located above the distilled water container, in which there is a heating element, the input of which is connected to the output of the second controlled voltage source, as well as a mixing blade.

EFFECT: high efficiency of separating encapsulated polymer material from reaction products and carrier gas.

2 cl, 1 dwg