EPOXY BINDER, PREPREG BASED ON IT AND PRODUCTS MADE FROM IT Russian patent published in 2023 - IPC C08L63/00 C08J5/24 B32B27/38 

FIELD: epoxy binder.

SUBSTANCE: group of inventions relates to an epoxy binder, including a mixture of liquid and solid difunctional epoxy resins based on bisphenol A, difunctional epoxy resin based on bisphenol F, a thermoplastic, a rubber-containing component consisting of rubber nanoparticles of the “core-shell” type distributed in the epoxy resin based on bisphenol A, latent hardener - dicyandiamide (DCDA), curing accelerator - asymmetrically disubstituted urea, technological additive based on a mixture of oligomeric substances and agents, characterized in that it additionally contains an aromatic hardener - 4,4'-diaminodiphenylsulfone and a modifier - acrylic block copolymer, with the following ratio of components, wt.%: liquid difunctional epoxy resin based on bisphenol A 23.8–30.2; solid difunctional epoxy resin based on bisphenol A 11.0-14.0; difunctional epoxy resin based on bisphenol F 16.0-20.0; thermoplastic 4.5-10.0; rubber-containing component 11.7-21.0; latent hardener - dicyandiamide 2.1-5.0; aromatic hardener – 4,4'-diaminodiphenylsulfone in an amount of 3.5-7.6; accelerator - asymmetrically disubstituted urea 2.5-3.5; modifier – acrylic block copolymer 5.0-7.5; technological additive based on a mixture of oligomeric substances and agents 0.1-1.0, also related to prepreg, epoxy binder and fibrous filler containing components in the following ratio, wt.%: epoxy binder 30.0-50.0; fibrous filler 50.0-70.0, also refers to a product made by direct pressing, vacuum or autoclave molding of prepreg.

EFFECT: group of inventions ensures the development of a high-tech low-viscosity epoxy binder, processed into prepreg at a low temperature, as well as a technological prepreg based on it, with improved stickiness and drapability, helping to reduce the labor intensity of the technological process for producing PCM during manual laying out and forming products with increased physical and mechanical properties characteristics (ultimate strength during interlayer shear, modulus of elasticity during static bending) for short and energy-efficient modes.

6 cl, 3 tbl, 5 ex