ISOCYANATE-FREE FIRE PROTECTIVE COATING COMPOSITION Russian patent published in 2023 - IPC C09D5/02 C09D175/04 C09D5/18 C09D7/48 C09D7/61 C09K21/00 

FIELD: chemistry.

SUBSTANCE: non-swelling waterborne fire-retardant coating composition comprising: (a) at least one bonding resin having reactive functional groups including both hydroxyl and carboxyl. The invention relates to a non-swelling, water-based, isocyanate-free (NISO) flame retardant coating composition. The non-swelling, water-borne, isocyanate-free, flame retardant coating composition comprises: (a) a binder resin having reactive functional groups including both hydroxyl and carboxyl groups, wherein the binder resin has an acid value of at least 5 mg KOH/g resin solid, and to less than 40 mg KOH/g resin solid and a hydroxyl value greater than 40 mg KOH/g resin solid but less than 100 mg KOH/g resin solid, wherein the binder resin is a polyurethane, (b) a crosslinking agent capable of reacting with at least some functional groups of the binder resin (a), where the crosslinking agent contains a carbodiimide functional group, (c) a fire retardant selected from the group consisting of polymeric brominated compounds, aluminum hydroxide, zinc borate and mixtures thereof. The composition contains inorganic substances in the range of 50-90 wt.% by total weight of solids and has a mass ratio of pigment and binder in the range of 0.5-10. In addition, the invention relates to a substrate coated with a coating composition and a method for coating a substrate, comprising application of the coating composition to and on the substrate and curing the coating composition.

EFFECT: obtaining a water-soluble fire-retardant coating composition that does not contain isocyanates, has good adhesion to various substrates and meets the requirements of FAR 25.853, whereas the coating composition can be a two-component (2K) composition with an extended shelf life compared to conventional 2K compositions.

7 cl, 5 tbl, 5 ex