Influence of the Molecular Weight of Polyvinyl Acetate on the Fire Protection Efficiency of Intumescent Fire-Retardant Coatings Based on Polyphosphate Systems
摘要
Abstract
The dependence of thermophysical and thermomechanical properties of the coating on the average molecular weight and molecular weight distribution of polyvinyl acetate was studied by the example of an intumescent fire-retardant composite containing the ammonium polyphosphate–pentaerythritol–melamine–titanium dioxide system and homopolymer PVA as a binder. It was found that, for homopolymer PVA, there is an optimal value of the average molecular weight, at which the maximum fire protection efficiency of the studied fire-retardant coating is achieved at optimal values of its thermal expansion ratio.