PROTECTIVE COATING BASED ON FLUORINE-CONTAINING PHTHALONITRILE OLIGOMERS FOR POLYMER COMPOSITE MATERIALS Russian patent published in 2022 - IPC C07C255/54 C08G73/06 C08L79/08 C09D179/00 C09D5/00 

Abstract RU 2767683 C2

FIELD: polymer materials.

SUBSTANCE: group of inventions relates to polymer composite materials produced from phthalonitrile oligomers as a component of a polymerisable resin for protective coatings of a polymer composite matrix. Materials with phthalonitrile matrices can be applied in engine parts in the aerospace industry, for high-temperature protection of electronics, and for application in shipbuilding in manufacture of non-flammable interior elements of submarines. The phthalonitrile oligomer as a component of a polymerisable resin for protective coatings of a polymer composite matrix constitutes a compound by the formula (I)

(I),

or the formula (II)

(II),

or the formula (III)

(III).

Described is a method for producing a phthalonitrile oligomer, characterised by consecutive nucleophilic substitution of fluorine atoms in hexafluorobenzene and/or a nitro group in 4-nitrophthalonitrile with hydroxyl-containing aromatic compounds. Also described are a composition for preparing a thermosetting resin, including at least one compound (I) or (II) or a mixture thereof with a compound by the formula (III), and a hardener, a method for preparing a thermosetting resin, and a method for preparing a thermosetting varnish. The thermosetting resin can be applied to the surface of a composite in the form of a melt or varnish (a solution of resin in an organic solvent) to create protective coatings.

EFFECT: production of a thermosetting resin based on fluorine-containing oligomers, exhibiting enhanced thermal-oxidative stability in the hardened form, as a protective coating, allowing for preservation (~90%) of the operating characteristics of PCM even after 200 h at 350°C; unlike known coatings based on phthalonitrile resins allowing, in the same conditions, for preservation of only ~70% of the initial operating characteristics of the composite; and characterised by ease of application.

29 cl, 1 tbl, 56 ex

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RU 2 767 683 C2

Authors

Terekhov Vladimir Evgenevich

Bulgakov Boris Anatolevich

Babkin Aleksandr Vladimirovich

Kepman Aleksej Valerevich

Dates

2022-03-18Published

2020-09-09Filed