METHOD FOR OBTAINING FINISHED CARBON FIBRES AND POLYETHER ETHER KETONE COMPOSITE MATERIALS BASED ON THEM Russian patent published in 2023 - IPC C08K9/04 C08K13/04 C08L61/16 C08J5/06 

FIELD: carbon fibre production.

SUBSTANCE: invention is related to a method for obtaining finished carbon fibres and polyether ether ketone composite materials based on them. A method for obtaining finished carbon fibres intended for special-purpose products in additive technologies is described, based on finishing carbon fibre by applying a sizing component from a solution, followed by drying, in an oven under vacuum at 87-88°C, characterized in that the sizing composition is a mixture of epoxypolyether (EPPE) based on epichlorohydrin and 1,3-dioxibenzene with a degree of polymerization n=105÷110 and 4,4'-diaminobenzophenone (DABP) is applied as a solution with a mass concentration of 0.28% in a mixture of chloroform 80 vol.% and methyl ethyl ketone 20 vol.%, and a stepwise increase in temperature is carried out with exposure to ultrasound with an operating frequency of 46 kHz simultaneous distillation of solvents in the following way: 20°C - 5 min; 34°C - 2 min; 54°C - 2 min; 64°C - 2 min; 84°C - 5 min, and the quantitative ratio of the components corresponds to the following wt.%: carbon fibre - 97.0; EPPE - 0.5÷ 2.5; DABP - 2.5÷ 0.5. A polyetheretherketone composite material is also described, intended as a structural polymer material for production of special-purpose products in additive technologies, containing a polymer matrix based on polyetheretherketone and finished carbon fibre, characterized in that it uses a finished carbon fibre obtained by the method according to claim 1, moreover, the quantitative ratio of components in the polyether ether ketone composite corresponds to the following wt.%: polyether ether ketone - 90, finished carbon fibre - 10.

EFFECT: improved rheological, physical and mechanical properties of the created polyetheretherketone composite material due to the introduction of a sizing composition, which increases the wettability of the filler and increases intermolecular interactions between carbon fibre and polyetheretherketone matrix.

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