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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.

Keywords

Thermal method ferric hydroxide oxide aluminum trihydroxide flame retardance

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Preparation and properties of iron-based flame-retardant reinforcing agent

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