METHOD FOR PRODUCING CAPSULATED AROMATIC FIRE-RESISTANT POLYETHERETHERKETONE Russian patent published in 2018 - IPC C08G65/40 

FIELD: technological processes.

SUBSTANCE: invention relates to a process for the preparation of encapsulated aromatic flame retardant polyether ether ketone used as a thermo-, heat- and flame-resistant structural polymeric material and 3D printing. Method for producing polyetheretherketone is that a high temperature polycondensation reaction of 3,3',5,5'-tetrabromophenolphthalein and 4,4'-difluorobenzophenone in N,N-dimethylacetamide in the presence of potassium carbonate and nanocarbon of the GNC brand. Capsulation is then carried out in a continuous manner by treating the polyether ether ketone solution in a chlorinated organic solvent with an aqueous gelatin solution, an apple pectin or a mixture of gelatin and apple pectin. Reaction mixture is then diluted with water at 45±5°C, filter the precipitate and dry.

EFFECT: invention makes it possible to obtain a capsulated aromatic flame retardant polyether ether ketone having high oxygen index values, high mechanical and thermal properties, low water absorption.

1 cl, 1 tbl, 3 ex