Novel Hybrid Organic–Inorganic Polymeric Coatings Containing Phosphonium or Acidic Groups for Improving Flame Retardancy of Wood

Flame-retardant polymeric coatings with high limiting oxygen index (LOI) were prepared by combining inorganic mineral huntite (H5) and additives synthesized in the present work into a formulation. In order to improve dispersion of Mg- (and Ca)-based H5 particles, containing phosphonium acidic groups employed homogenize fillers polymer matrix. Specific blend combinations commercial matrix Ecrovin® LV 340 eco poly(benzyltriphenylphosphonium-co-4-styrene sulfonic acid) P(SSH-co-SSBTPB60) poly(hexadecyltributylphosphonium-co-4-styrene P(SSH-co-SSTBHDPB80), groups, led LOI values 34.5% 33.5%, respectively. The novel flame-retardant inhibited combustion coated wood substrates, which is attributed combination that promote filler support increase values.