Fire-retardant and fire-barrier poly(vinyl acetate) composites for sealant application

Abstract

Abstract. Fire-retardant ceramifying poly(vinyl acetate) (PVAc) sealants have been prepared. The degradation of PVA was integrated with the action of the fire retardants to reduce flammable gases, produce carbonaceous char and convert the fillers into a self-supporting ceramic barrier. PVA is readily degraded by elimination of acetic acid, yielding a char that provides a transitory phase as the filler particles fuse into a ceramic mass. Acetic acid is eliminated at similar temperature to the release of water from magnesium hydroxide fire-retardant, thereby diluting flammable acetic acid. The residual oxide from the fire-retardant filler and structural filler are fused by a flux, zinc borate. The degradative and ceramifying processes were characterised using thermogravimetry, infrared spectroscopy, scanning electron microscopy and ceramic strength. Thermogravimetry of the composites was compared with additive mass loss curves calculated from the components. Deviations between the experimental and additive curves revealed interactions between the components in the composites. The modulus of the PVAc composites and the strength of their ceramic residues after combustion were determined.

Study of flame‐retarded silicone rubber with ceramifiable property

“…Since the decomposition product of the SR and the fumed silica is amorphous silica, which begins to crystallize above 1200°C, it can be inferred that the diffraction peak of quartz stone is a crystal, which is dissolved in the liquid phase by the glass frit 1 after being melted by heat and precipitates during the cooling process, at which time the glass powder acts as a flux . The diffracted characteristic peak of zinc borate disappears, and the B 2 O 3 ‐ZnO glass phase is melted and reacted with Mg(OH) 2 ‐decomposed MgO to transform into a hard MgO ceramic protective layer, which effectively blocks the heat transfer . Besides, the new intensive diffraction peaks of ceramics (2 θ = 23.1°, 25.6°, 30.8°, 31.6°, 34.2°, 36.8°, 49.3°, 65.6°) were detected at 800°C; a “hump” appears between 2 θ = 12° to 30°, which is a diffuse scattering peak of amorphous matter.…”

Synergistic Effect of Mica, Glass Frit, and Melamine Cyanurate for Improving Fire Resistance of Styrene-Butadiene Rubber Composites Destined for Ceramizable Coatings

“…It was synthesized by the emulsion method (e-SBR) and purchased from Synthos S.A., Oswiecim, Poland. The rubber contains [22][23][24][25]…”

Introduction to Ceramizable Polymer Composites

“…Ceramizable composites based on low density linear polyethylene (LLDPE) [29] and poly(vinyl acetate) (PVA) [1] have recently been described in scientific literature. Polyethylene is one of the most representative polymer for a group of polyolefines.…”

“…According to Al-Hassany et al [1], PVA based ceramizable composites can be used for sealing applications. The authors studied thermal stability and morphology of ceramizable composites after heat treatment.…”