METHOD FOR PRODUCING HIGH-STRENGTH, HEAT AND FIRE-RESISTANT SPHEROPLASTICS Russian patent published in 2022 - IPC C08L63/00 C08L63/06 C08K7/16 C08K7/22 

FIELD: shaping.

SUBSTANCE: invention relates to the field of producing lightweight structural materials with increased indicators of strength, heat resistance and, simultaneously, with reduced flammability, applicable for deep-sea work, in construction equipment, aviation, cosmonautics, and other fields of new technology. The purpose of the invention is a method for producing spheroplastics allowing for creation of lightweight materials with a thickness of up to 400 mm with a low density, capable of sustaining water pressure at a depth of up to 1,000 m, stable in operation at temperatures up to +300°C, with reduced flammability, arc resistance, and radio transparency. The technical task is solved by using EC-N brand triglycidylisocyanurate in the form of a solution. Claimed is a method for producing high-strength, heat and fire-resistant spheroplastics based on epoxy resins with high specific functionality, nitrogen-containing hardening agents, and hollow microspheres with a diameter of 10 to 500 mcm, according to the invention, a mixture produced by mixing epoxicyanurate resin (A) and vinyl cyclohexane monoxide (B) in a reactor in the ratio A:B ( wt.pts.) from 80:20 to 60:40 is used as an epoxy component, and a mixture of an amino adduct para-aminobenzylaniline with an epoxy resin - diglycidyl ether of polyepichlorohydrin produced from the interaction of an epoxy resin with an amine with a 4÷6-fold excess of the latter from the stoichiometric amount for the epoxy resin, (C) and 4,4'diphenylmethane diisocyanate blocked by methylpyrazole, (D) at the ratio C:D (pts. wt.) from 80:20 to 60:40, as a hardening agent, wherein per 100 wt.pts. of the epoxy component, the hardening component is introduced in an amount from 40 to 80 wt.pts., and hollow microspheres are introduced at the ratio of polymer base:microspheres ( wt.pts.) from 90:10 to 50:50, then the mixture is evacuated for 10 minutes, poured into restrictive metal moulds, hardening is executed in two stages, the first stage at a temperature of 60÷80°C for 3÷4 hours, the second stage at a temperature of 150÷170°C for 1÷2 hours . The authors managed to overcome the disadvantages of EC-N resin by diluting the resin with vinyl cyclohexene monoxide and by applying a system of two hardening agents hardening epoxy resins at different temperatures.

EFFECT: production of spheroplastics allowing for creation of lightweight structural materials.

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