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Hu X.,Tongji University | Wang G.,Tongji University | Wang G.,Key Laboratory of Advanced Civil Engineering Materials | Huang Y.,Tongji University
Journal of Coatings Technology Research | Year: 2013

A cyclic polyphosphate (CPPA) was synthesized by the reaction of polyphosphoric acid and pentaerythritol. Polyethylene glycol (PEG) was introduced in the structure of CPPA to improve its solubility in water and ethanol and five kinds of reactive type flame retardants (MCPPA) were obtained. 31P NMR, 1H NMR, FTIR, and TGA were used to characterize the composition and structure of CPPA and MCPPAs. The experimental results showed that there were 25% cyclic P-O-C structures in the product and MCPPA had better carbonization ability than CPPA. Five kinds of transparent fire-resistive coatings were prepared by the mixing of amino resin with five kinds of MCPPAs. The results of the fire protection test showed that both the fire-resistive time of coatings and intumescent factor of char layers decreased with the increase of molecular weight of PEG. The results of TGA and EDS showed that the carbonaceous residue of coatings and the antioxidation ability of char layers also decreased regularly with the increase of molecular weight of PEG. The SEM images demonstrated that the coating prepared with low molecular weight of PEG contributed to dense form structure and narrow distribution of cell size. Above all, the transparent fire-resistive coating prepared with PEG 200 had the best fire retardancy and stable thermal behavior. © 2013 American Coatings Association & Oil and Colour Chemists' Association. Source


Wang G.,Key Laboratory of Advanced Civil Engineering Materials | Wang G.,Tongji University | Yang J.,Tongji University
Surface and Coatings Technology | Year: 2010

Modified expandable graphite (MEG, expandable graphite modified by polyethylene glycol) was used as modifier to improve the fire protection of intumescent fire resistive coating. The FTIR spectra, TGA analysis and SEM images well demonstrated that the surface of EG flakes was successfully modified by polyethylene glycol. After adding 4. wt.% EG or MEG into the coatings, the thermal degradation and char formation of the coatings were investigated in detail by using TGA, XRD, X-ray fluorescence spectrometry (XRF) and SEM. The TGA results showed that the addition of EG and MEG could improve the thermal degradation of the coatings and enhanced the anti-oxidation of the char layers at high temperature. The XRF results showed that anti-oxidation of the coatings was improved by adding EG or MEG. The SEM images demonstrated that the cell size of the char layer increased and the cell size distribution of the char layer became narrow after adding MEG into the coating. © 2010 Elsevier B.V. Source


Wang G.,Tongji University | Wang G.,Key Laboratory of Advanced Civil Engineering Materials | Huang Y.,Tongji University | Hu X.,Tongji University
Progress in Organic Coatings | Year: 2013

A mixture (denoted as PX) of phosphates was prepared by the reaction of phosphoric acid and a kind of bicyclic pentaerythritol phosphate (PEPA, 1-oxo-1-phospha-2,6,7-trioxabicyclo[2.2.2]-4-hydroxymethyl octane). Then PX was successfully copolymerized with PEG200 to achieve a novel phosphorus-containing polymer (denoted as PX-co-PEG). 31P NMR, 1H NMR and FT-IR analysis results showed that there were 38.7 wt.% PEPA phosphates and 61.3 wt.% pentaerythritol biphosphates in the PX mixture. The result of GPC indicated that the molecular formula of PX-co-PEG could be noted as PX 2.0PEG 3.0. Fire protection test results proved that PX-co-PEG modified amino resin applied on the plywood boards effectively extended the protection time over flame. The decomposition process of fire resistant coating was studied by thermogravimetric analysis and FT-IR which could be divided into three characteristic temperature stages. The solid residue was kept to be 14.6 wt.% at 787 °C. © 2012 Elsevier B.V. Source


Wang G.,Tongji University | Wang G.,Key Laboratory of Advanced Civil Engineering Materials | Yang J.,Tongji University
Progress in Organic Coatings | Year: 2011

Glass flake (GF) was used as a modifier to improve the fire protection and water resistance of waterborne intumescent fire resistive coating. The influences of GF on the properties of the coatings were investigated in detail by using TGA, XRD, X-ray fluorescence spectrometry (XRF), SEM and fire protection test. The TGA results proved that addition of GF could enhance the anti-oxidation of the char layers and increase the residue weights of the coatings. The XRF results indicated that anti-oxidation of the coatings modified by GF was improved. The SEM images demonstrated that addition of GF could improve the foam structure of the coatings. After immersed in water over 600 h, the results showed that the thermal stability and fire protection of the coating without GF were significant decreased, but the coatings modified by GF could still maintain the excellent intumescent effect and fire protection. © 2010 Elsevier B.V. All rights reserved. Source


Wang G.,Key Laboratory of Advanced Civil Engineering Materials | Wang G.,Tongji University | Yang J.,Tongji University
Surface and Coatings Technology | Year: 2010

The combination of epoxy emulsion and self-crosslinked silicone acrylate (SSA) emulsion was used as mixed binder for preparing water-borne intumescent fire resistive coating. The influences of binders on the properties and char formation of the coatings were investigated in detail by using thermogravimetry (TG), scanning electron microscope (SEM), X-ray diffraction (XRD), X-ray fluorescence spectrometry (XRF), rheological measurement, fire protection test and anticorrosion property test. It was found that the fire protection and foam structure of the coating was significantly improved by adding 14% SSA (by mass). The TG results showed that adding SSA increased the residue weights of the coatings. The XRF results demonstrated that anti-oxidation of the coatings was improved by adding SSA into the mixed binders. The results of anticorrosion property test indicated that the anticorrosion property of the coatings was enhanced with increase of content of SSA. Crown Copyright © 2009. Source

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