Studying On Fire And Smoke Suppression Properties Of Intumescent Fire Retardant Coatings Of Styrene-acrylic Emulsion

Styrene-emulsion intumescent fire retardant coating basing on its low toxicityand low smoke, fire, environmental protection, good decorative effect has become ahot research in today’s water-based fire retardant coating.In this paper, a series of intumescent fire retardant coatings have been preparedusing intumescent flame retardant [IFR, based on ammonium polyphosphate (APP),pentaerythritol (PER), melamine (MEL)], styrene-acrylic emulsion and fire smokesuppressant (like as Fe2O3, FeOOH, iron oxide green, M-EG, MEG, red mud andCu3(MoO4)2(OH)2). The smoke suppression properties and flame retardant effect offire smoke suppressant in intumescent fire retardant coatings have been studied bycone calorimeter (CCT)，smoke density analyzer (SDA). The thermal degradationproperties of intumescent fire retardant coatings with different content of fire smokesuppressants have been investigated using thermal-gravimetric analysis (TGA). And,the structures of char residues from CCT test were analyzed by scanning electronmicroscope (SEM).The CCT results indicate that the addition of fire smoke suppressants FeOOHand iron oxide green can significantly decrease heat release rate (HRR), total heatrelease (THR), smoke production rate (SPR), total smoke release (TSR) and enhancethe char residue of the coatings. The SDA results show that they can effectivelydecrease smoke production with or without the application of a pilot flame. The TGAresults show that they can enhence the weight of char residue at high temperature. The SEM results show they can make the char residue more dense and compact than thesample without fire smoke suppressant. It als indicates that sample A4with2%FeOOH/IFR and sample B4with1%iron oxide green/IFR produce the best fire andsmoke suppressant effect.Polyvinyl pyrolidone (PVP) was used to modify the surface of expandablegraphite (EG) to get modified-expandable graphite (M-EG). An organic-inorganichybrid intumescent flame retardant (MEG) was synthesized by modifying expandablegraphite with charring agent (PER). The structural characterization of MEG and M-EG was used in FTIR Spectra. The CCT results show that the addition of MEG andM-EG can reduce the HRR, THR value. And, the TGA results show that it canimprove the quality of the residual carbon in the fire-resistant coatings.It synthesizes Cu3(MoO4)2(OH)2by Na2MoO4·2H2O and CuSO4·5H2O. The CCTresults showed that it can significantly reduce HRR, THR, SPR and TSR value andincrease the char residues. Sample M-3containing1%Cu3(MoO4)2(OH)2/IFR showedthe best performance of fire and smoke suppression. Furthermore, In this study, thethermal decomposition behaviors of coating containing intumescent fire retardant(IFR) and coating with IFR/1wt%Cu3(MoO4)2(OH)2were studied by TG at heatingrates of10°C/min、20°C/min30°C/min、and40°C/min in nitrogen atmosphere,indicating that with increasing heating rate, the maximum rate of weight loss onheating to a high temperature zone gradually moved, which indicates the greater theheating rate, the sample will break down faster. Based on Kissinger method andFlynn-Wall-Ozawa method, the apparent activation energy of the coating wascalculated.Red mud can significantly reduce the HRR, THR, SPR and TSR values andimprove the char residues as a smoke suppressant in the CCT test. The SDA resultsshow that red mud can effectively decrease smoke production. The SEM results showthat it can significantly change the results of the carbon layer. It indicates that red mudcan produce good fire and smoke suppressant effect.