PHTHALONITRILE BINDER AND COMPOSITION BASED ON IT, INTENDED FOR MANUFACTURE OF POLYMER COMPOSITE MATERIAL Russian patent published in 2023 - IPC C08G73/06 C08J5/24 B32B27/00 

FIELD: polymer chemistry.

SUBSTANCE: invention relates to the field of polymer chemistry and a technology of the manufacture of polymer composite materials (hereinafter – PCM). The present invention relates to a group of inventions: a binder composition intended for the manufacture of PCM; a method for the production of a solution of a binder composition; prepreg for the production of PCM; press material for the production of PCM; a method for the production of prepreg; a method for the production of press material; polymer composite material. This binder composition includes phenol-formaldehyde oligomer of the formula (I) in amount from 75 to 95 wt.%, which contains from 60 to 99% of links of the general formula (II) , and a polymerization initiator is the rest. The method for the production of a solution of the binder composition includes mixing of novolac phenol-formaldehyde resin with 4-nitrophthalonitrile in a solvent in the presence of a base taken in amount of at least 1.0 mole equivalent relatively to phenolic hydroxyl groups, at a temperature of 20-40°C for 8-60 hours until complete disappearance of 4-nitrophthalonitrile, followed by filtration of the mixture, addition of 5-25% of the oligomer weight to the resulting solution of the polymerization initiator, removal of part of the solvent at reduced pressure in whole or in part until a concentration of 20-70% of the binder. Prepreg for the production of PCM is a reinforcing filler in the form of carbon fabric, fiberglass, aramid fabric, or basalt fabric, impregnated with the binder composition, which is 30-50 wt.%. The method for the production of prepreg includes pulling of the reinforcing filler through a bath with the solution of the binder composition, squeezing out of the excess solution, using shafts, followed by removal of solvent residues by heating from 25 to 140°C. Press material for the production of PCM is a reinforcing filler in the form of carbon fiber; fiberglass; aramid fiber; basalt fiber impregnated with the binder composition, which is 30-45 wt.%. The method for the production of press material includes mixing of chopped fiber with the solution of the binder composition, followed by removal of the solvent by heating from 70 to 140°C. PCM is obtained from prepreg or press material by hot-pressing molding, or vacuum molding, or autoclave molding.

EFFECT: production of a new composition based on phthalonitrile binders, which has a viscosity of no more than 500 MPa·s, effective for impregnation of reinforcing fillers based on organic and inorganic fabrics and fibers; capability of high polymerization rate, providing high mechanical properties of PCM regardless of the reinforcing filler, and preservation of these properties at elevated temperatures (at least 50% of an initial value at 250°C), development of more efficient and less multi-stage and resource-intensive methods for its production; and less resource-intensive methods for its curing in the manufacture of PCM.

14 cl, 7 tbl, 121 ex