Microencapsulated Ammonium-polyphosphate with Polyurethane in Polypropylene Polymer
Owing to the lack of hydroxyl groups, polypropylene (PP) lacks charring ability while it is subject to burning. In this case, charring could be improved by incorporating flame retardants. Intumescent flame-retardant systems that provide acidic, carbonizing, and blowing agents can be used to increase the flame retardancy of PP. Ammonium polyphosphate is a widely used flame retardant that can be part of this type of system; however, the fact that it does not contain carbon itself necessitates the addition of a carbonizing element. In this study, APP was microencapsulated with polyurethane (PUR) using polymeric methylene diphenyl diisocyanate (pMDI), and two types of polyols, a glycerol-based and a glycerol-sorbitol-based. The microencapsulation reaction was performed with two different solvents, toluene and ethyl acetate, in the presence of different catalysts. The in-situ polymerization reaction was optimized by examining the effects of various conditions on parameters such as the PUR yield, shape of the microcapsules, and flammability of the products. The best composition was chosen to prepare.
Polypropylene composites with different additive contents (15%, 20%, 25%, 30%, and 35%). They were compared by flammability tests such as UL-94, Limiting Oxygen Index (LOI), and Cone Calorimetry (CC). In addition, Thermogravimetric Analysis (TGA), Fourier Transform Infrared Spectroscopy (FTIR), and Scanning Electron Microscopy (SEM) were performed to determine the influence of different additive contents on the final products, and the results were compared with those of pure PP and PP incorporated with neat APP. The results showed that, as the additive content increased, the flame retardancy of the composites improved.
szerző
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Yusifov Ziya
Vegyészmérnöki mesterképzési szak, nappali MSc
mesterképzés (MA/MSc)
konzulensek
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Dr. Szolnoki Beáta
adjunktus, Szerves Kémia és Technológia Tanszék -
Nguyen Thanh Thuy Tien
doktoráns, Szerves Kémia és Technológia Tanszék
