Fire Resistance, Thermal and Anti-Ageing Properties of Transparent Fire-Retardant Coatings Modified with Different Molecular Weights of Polyethylene Glycol Borate

Abstract

Four kinds of polyethylene glycol borate (PEG-BA) with different molecular weights were grafted into cyclic phosphate ester (PEA) to obtain flexible phosphate esters (PPBs), and then applied in amino resin to obtain a series of transparent intumescent fire-retardant coatings. The comprehensive properties of the transparent coatings containing different molecular weights of PEG-BA were investigated by various analytical instruments. The transparency and mechanical analyses indicate that the presence of PEG-BA slightly decreases the optical transparency of the coatings but improves the flexibility and adhesion classification of the coatings. The results from fire protection and cone calorimeter tests show that low molecular weight of PEG-BA exerts a positive flame-retarded effect in the coatings, while high molecular weight of PEG800-BA behaves against flame-retarded effect. Thermogravimetric and char residue analyses show that the incorporation of low molecular weight of PEG-BA clearly increases the thermal stability and residual weight of the coatings and generates a more compact and stable intumescent char on the surface of the coatings, thus resulting in superior synergistic flame-retarded effect. In particular, MPPB1 coating containing PEG200-BA exerts the best flame-retarded effect and highest residual weight of 36.3% at 700 °C, which has 57.6% reduction in flame spread rate and 23.9% reduction in total heat release compared to those of MPPB0 without PEG-BA. Accelerated ageing test shows that low molecular weight of PEG-BA promotes to enhance the durability of structural stability and fire resistance of the coatings, while PEG800-BA with high molecular weight weakens the ageing resistance. In summary, the fire-resistant and anti-ageing efficiencies of PEG-BA in the coatings depend on its molecular weight, which present the order of PEG200-BA > PEG400-BA > PEG600-BA > PEG800-BA.

Organophosphorus Reinforced Poly(vinyl alcohol) Nanocomposites Doped with Silver-Loaded Zeolite L Nanoparticles as Sustainable Materials for Packaging Applications

“…In the case of the PVA/OA-4, the T 5% is lower probably the presence of the high content of ze-Ag in the sample leads to the catalysis of this. The weight loss of the PFR-4 took place between 267 • C and 361 • C, corresponding to the release of small molecules and breakdown of the weak bonds such as P-O-C and P-C [40][41][42][43][44][45]. Also, from the TG curves it can be observed that the PFR-4 can reduce the T 5% of the PVA/OA-0 and promote the formation of the carbonaceous layers on the surface.…”

Preparation of polyethylene glycol/polyacrylamide interpenetrating network hydrogel for simultaneously enhancing the fire protection and aging resistance of fireproof glass

“…All samples have the same characteristic peaks at 3250 ~ 3550 cm −1 (N–H and –OH groups), 1638 cm −1 (stretching vibration of C=O groups) and 1400 cm −1 (stretching vibration of C–N groups), indicating the formation of the polyacrylamide polymer system 19 . The spectra of Q2‐Q6 samples displays rocking vibration peak of –CH 2 , stretching vibrational peak of C–O–C, and bending vibration peak of O–H located at 939, 1096, and 1465 cm −1 , respectively, demonstrating that the mixture of PEG and PAM forms the polymer interpenetrating network structure by physical blending 20 …”

“…19 The spectra of Q2-Q6 samples displays rocking vibration peak of -CH 2 , stretching vibrational peak of C-O-C, and bending vibration peak of O-H located at 939, 1096, and 1465 cm À1 , respectively, demonstrating that the mixture of PEG and PAM forms the polymer interpenetrating network structure by physical blending. 20…”

Flame Retardant Coatings: Additives, Binders, and Fillers

“…Certain substances swell when heated; this phenomenon is known as intumescence [ 97 ]. In an intumescent flame retardant, exposure to flame or heat initiates a series of physical and chemical processes, resulting in an expanded multicellular layer that acts as a thermal barrier, efficiently protecting the elements from a rapid increase in temperature and preventing the structures from collapsing under severe flame conditions [ 115 ]. This state is distinguished by the usage of flame-resistant insulating foam.…”