FILLED WITH NANOSTRUCTURED SILICON CARBIDE WITH MODIFIED SURFACE POLYIMIDE COMPOSITE MATERIAL PRODUCTION METHOD Russian patent published in 2018 - IPC C08K3/14 B82B3/00 C08L79/08 C08G73/10 C08J9/28 

FIELD: technological processes, nanotechnologies.

SUBSTANCE: invention relates to the field of composite materials production using nanotechnology. Disclosed is the filled with nanostructured silicon carbide with modified surface polyimide composite material production method implemented by the condensation of aromatic polycarboxylic acids dianhydrides and 4,4'-oxydianiline in the inert gas stream in the polar organic solvent medium (selected from the group: N-methylpyrrolidone, NN-dimethylacetamide) in the presence of modified nanostructured silicon carbide produced from the unmodified nanostructured silicon carbide, pre-oxidized in air at a temperature of 700 to 1,200 °C for 5–20 minutes and cooled down to room temperature under vacuum or inert gas flow, suspended in the dry organic solvent (selected from the group: N-methylpyrrolidone, NN-dimethylacetamide) under the influence of ultrasound with the frequency of 20 kHz for 20–40 minutes, which in the form of suspension containing 20–40 wt% of silicon carbide from the resulting composite weight at 80–100 °C, is mixed with 3-aminopropyltriethoxysilane, injected in the amount corresponding to the silane to silicon carbide weight ratio of 1:(5–10), for 40–60 minutes, after which the suspended modified silicon carbide is filtered off and mixed with 4,4'-oxydianiline in the dry organic solvent (selected from the group: N-methylpyrrolidone, NN-dimethylacetamide) under the influence of ultrasound with the frequency of 20 kHz in the inert gas flow for 20–40 minutes, is cooled down to 5–10 °C, to the resulting reaction mass, batchwise with stirring, equimolar relative to 4,4'-oxydianiline, the aromatic polycarboxylic acid dianhydride amount is added, and the resulting reaction mass is exposed to ultrasound with the frequency of 20 kHz for 15–25 minutes, then mixed at 20–25 °C for 5–9 hours, then the formed polymeric compound is placed in the heat-resistant container and dried with stepwise heating according to the following scheme: from 50 to 65 °C for 2–3 hours, from 90 to 115 °C for 3–4 hours, from 150 to 250 °C for 2–3 hours, from 280 to 300 °C for 0.5–1 hours, with subsequent vacuum cooling down or cooling down in the inert gas stream.

EFFECT: proposed is the composite material with high decomposition temperature production method.

3 cl, 2 ex