FIELD: chemistry.
SUBSTANCE: in the present method, biopolymer starting material and a plasticiser are fed into the feeding zone of an extruder having an auger configuration such that the biopolymer starting material, particularly starch, in the extruder undergoes processing by shearing forces, and a cross-linking agent is fed into the extruder on the process scheme downstream the feeding zone. The method is characterised by output higher than or equal to 1.0 metric ton of the product per hour. The biopolymer starting material and plasticiser are preferably fed into the feeding zone separately. The extruder in the feeding zone can have single-turn elements. Temperature in the intermediate section of the extruder is not higher than 100°C. Configuration of the auger can include two or more sealing sections for water vapour. Shearing forces in the first section of the extruder can be greater than shearing forces in the neighbouring second section of the extruder lying on the process scheme downstream the first section. Water can be fed into the post-reaction section lying after the position in which the cross-linking reaction has finished in order to improve operational characteristics of the head.
EFFECT: method enables to obtain cross-linked nanoparticles of a uniform size, having high molecular weight and also enables to manipulate molecular weight of a protective colloid.
38 cl, 3 dwg, 2 tbl, 10 ex
