Application Research On Fluidized Bed Combustor Fly Ashes In Polypropylene And Ethylene Propylene Diene Monomer

The aim of this work was to test circulating fluidized bed combustion flyashes (CFAs) for its potential to be utilized in polymer composites manufacturing.In order to solve the problems that CFAs causes resource dissipation andenvironmental pollution.In this study, CFAs was modified by stearic acid, inyl triethoxy silanecoupling agent (A151) and NaOH. The resulting coated and uncoated CFAs werefully characterized by the Zeta electric potential, fourier transform infraredspectroscopy (FTIR), particle size analyzer, powder X-ray diffraction (XRD),X-ray fluorescence diffraction(XRF), oil absorption, activation grade, contactangles, sedimentometric analysis, brunauer emmett teller (BET),thermogravimetric analysis/differential thermal analysis (TGA/DTA), X-rayphotoelectron spectroscopy (XPS) and transmission electron microscopy (TEM).The results showed that (1) the stearic acid coated onto the surface of CFAsparticles in the physical and chemical ways, and the total clad ratio reached2.05%by measuring TGA/DTA curve. The percentage of CFAs particles focusedto a narrow range2-4μm and the median mean size was3.2μm more thanuncoated CFAs. The properties of hydrophobic and dispersive of CFAs particlesimproved after stearic acid coating.(2) the particles-particles that A151modifiedCFAs has a clear interface, and the specific surface area is5.7089m2/g, less thanthat of unmodified CFAs.(3) Alkali treatment resulted in the rearrangement ofbonds of the Al–O/Si–O in CFAs. The product of activated CFAs by NaOH wasthe cementing material which had remote disordered and short-range orderedstructures. The tiny crystals in cementing material might be the mixture ofzeolite and limestone.The CFAs and modified CFAs was used to fill PP, EPDM and PP/EPDM, andcompared with that of CaCO3filled. The effect of CFAs on the mechanical, thermal,morphological and processable properties of the composites were studied byuniversal testing machine, scanning electron microscopy (SEM),thermo-gravimetric (TGA), differential scanning calorimetry (DSC) and meltflow index (MFI). The results showed that (1) the addition of stearic acidmodified CFAs (M1-CFAs) had significantly toughening effect. When the content of M1-CFA was15%, the elongation at break attained the mixture80.20%. With the content of M1-CFA increased, the tensile strength, elongationat break and MFI of M1-CFA/PP composites decreased, and the thermal stabilityincreased.(2) The content of CFAs that NaOH activated (M3-CFAs) was10%to fillEPDM, the tensile properties of the composites increased. When the content ofM3-CFAs was20wt%, the tensile strength of composites increased by28%, butthe elongation at break decreased slightly. The cementing product of activatedCFAs by NaOH was involved in thermal cross-linking reaction in the process ofsulfide. Alkali treatment is potential for recycling CFAs as a suitable fillermaterial in polymer composites.(3) With the content of M1-CFAs increase, thetensile strength, elongation at break and thermal stability of PP/EPDM/M1-CFAscomposite increased. The mass radio of the PP/EPDM was70/30, the elongationat break of the composites was reached the maximum. When the content of theM1-CFAs was4.5%and9%, respectively, the tensile strength of PP/EPDM/M1-CFAs composite was more than that of PP/EPDM/CaCO3. When the massratio of the PP/EPDM/M1-CFAs was70/16.5/13.5, its thermal stability wasreached the maximum.