METHOD FOR OBTAINING FINISHED CARBON FIBRES AND POLYMER COMPOSITIONS BASED ON THEM Russian patent published in 2023 - IPC C08J5/06 C08L79/08 C08K9/04 

FIELD: chemistry.

SUBSTANCE: invention is related to a method for producing finished carbon fibres and polymer compositions with inorganic, in particular carbon, fibres as fillers and can be used for production of special-purpose structural products in additive technologies. A method for producing finished carbon fibres intended for structural polymeric materials based on finishing of carbon fibre by applying a finish as a solution followed by drying in an oven under vacuum at 105-107°C, the finish is applied to a carbon fibre 3 mm long as solutions with concentrations of 0.13-0.47 wt.%, obtained by dissolving an oligomeric sulfone based on 4.4'-dioxyphthalophenone and 4,4'-dichlorodiphenylsulfone with degree of polycondensation n=13÷17 in the organic solvent 1,4-dioxane, and a stepwise rise in temperature and distillation of the solvent are carried out under the following conditions: 20°C - 8 min; 45°C - 15 min; 65°C - 10 min; 85°C - 10 min; 95°C - 10 min; 103°C - 15 min, with the following quantitative ratio of components in wt.%: oligomeric sulfone 1-3.5, carbon fibre 99-96.5. The invention is also related to a polymer composition used in the manufacturing of structural products in additive technologies, containing a polymer matrix based on polyesterimide obtained by polycondensation of 1,3-diaminobenzene and dianhydride 2,2'-bis[4(3,4-dicarboxyphenoxy)phenyl]-propane with degree of polycondensation n=110÷120, and finished carbon fibre obtained by the method of obtaining finished carbon fibres, in the following quantitative ratio of components in the polymer composition in wt.%: polyesterimide 80, finished carbon fibre 20.

EFFECT: improving the thermal stability of the created polymer carbon fibre compositions based on polyesterimide due to the introduction of a finishing composition - an oligomeric sulfone based on 4,4'-dioxyphthalophenone and 4,4'-dichlorodiphenylsulfone with degree of polycondensation n=13÷17 which increases the wettability of the filler and increases the interface interactions between the filler and the polyesterimide matrix.

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