THERMALLY PROTECTIVE INTUMESCENT COMPOSITIONS

摘要

Novel intumscent compositions are disclosed having a component package for providing a char and char foam, a polymeric binder material and a crack control agent having 3-6 carbons and a boiling point in the range of 75-175 DEG C, the crack control agent having the structural formula R<2>-O-CH2-CR<1>H-O-R<3> wherein R<1> = -H or -CH3; and R<2> and R<3> independently comprise -H, -R<4>, or -COCH3, wherein R<4> = C1-C3 alkyl group. Further exemplary compositions comprise a polymer binder comprising a vinyl acetate/acrylate copolymer and a surfactant package with a dispersant. Methods of making and using the composition are also disclosed, as well as substrate packages incorporating the intumescent coating. One advantage of the intumescent coatings of the invention is the ability to prevent cracks in coatings which are spray-applied in relatively few passes, while achieving excellent fireproofing properties.