Abstract
An iron-based flame-retardant reinforcing agent was prepared by hydrothermal method using ferric sulfate Fe2(SO4)3 and urea as starting materials. The product was characterized with respect to crystal structure and thermolysis behavior, respectively, by means of X-ray diffraction and thermogravimetric differential thermal analysis. Upon combining these with Fourier transform infrared spectroscopy, it was identified as ferric hydroxide oxide with a chemical composition of FeOOH·0.43H2O. The product was compounded with aluminum trihydroxide to flame-retard poly(ethylene- co-1-octene); the effect of FeOOH content on flame retardancy of the poly(ethylene- co-1-octene) was investigated, based on which the synergistic flame-retardant mechanism was discussed. The results show that addition of a small quantity of FeOOH can remarkably improve the flame retardance of poly(ethylene- co-1-octene)/aluminum trihydroxide compound. When the additive amount of FeOOH is 1.5 phr, the limiting oxygen index of the compound is 30.8%, and the vertical UL-94 flame test level reaches V-0.
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