METHOD OF CONNECTING SYNTACTIC FOAM MONOBLOCKS INTO COMPOSITE BUOYANCY BLOCKS Russian patent published in 2023 - IPC B29C65/48 B29C65/56 E04C1/00 C09J5/00 C09J163/00 

FIELD: polymers.

SUBSTANCE: invention relates to polymer composite materials and structures made from them, in particular to buoyancy blocks for deep-sea equipment made of syntactic foam, and relates to a method for connecting syntactic foam monoblocks. The method includes joining syntactic foam monoblocks into composite buoyancy blocks, consisting of separate, prefabricated, simple-shaped syntactic foam monoblocks in the form of parallelepipeds, folded in the "brickwork" type and glued together using an adhesive composition, with the exception of monoblocks forming the outer surface, which repeats the contours of the outer body of the apparatus, characterized in that, in order to fix separately manufactured monoblocks relative to each other during their gluing, rectangular recesses with a depth of about 5 mm are made on their end outer surfaces, which should be located strictly opposite each other relative to the contact surface of adjacent monoblocks and into which strips of polymer composite material are attached, while for gluing separately manufactured monoblocks, an adhesive composition based on syntactic foam is used, from which monoblocks are made, containing a resin composition with additives, including: epoxy resin ED-20 30 wt. pts., EA-P modified epoxy resin 30 wt. pts., Arsogofen modified structuring resin 30 wt. pts., PIC polyisocyanate 1 wt. pts., modifier adduct LAR 10 wt. pts., mixed aromatic amine hardener NHP - 1 30 wt. pts. - for the case of heat treatment or a mixture of hardeners PEPA and I6-M in a ratio of 1:1 by weight, 20 wt. pts. - for the case of the impossibility of heat treatment, hydrophobic Aerosil 1% by weight, and a filler, including: microspheres with a volume content of 50 to 60%.

EFFECT: increasing the manufacturability and reduce the complexity of manufacturing composite buoyancy blocks, as well as increasing the bond strength between syntactic foam monoblocks when they are assembled into composite blocks while maintaining water resistance.

3 cl, 2 dwg