Zinc hydroxystannate coating

Baggaley, R.G., Hornsby, P.R., Yahya, R., Cusack, P.A., and Monk, A.W., The influence of novel zinc hydroxystannate-coated fillers on the fire properties of flexible PVC, Fire Mater., 21, 179, 1997. 

Hornsby, P. R., Cusack, P. A., Cross, M., Toth, A., Zelei, B., and Marosi, G. 2003. Zinc hydroxystannate-coated metal hydroxide fire retardants Fire performance and substrate-coating interactions. Journal of Materials Science 38 2893-99. 

An investigation was carried out into the fire retardant behaviour of zinc hydroxystannate-coated fillers (alumina trihydrate and magnesium hydroxide) in PVC and EVA cable formulations. Measurements were made of the limiting oxygen index, peak rate of heat release and smoke parameter and the data for unfilled and filled formulations compared. X-ray photoelectron spectroscopy and diffuse reflectance infrared Fourier-transform spectroscopy were used to study the filler-coating interaction. 16 refs. 

Atlanta, Ga., 26th-30th April 1998, p.3310-2. 012 NOVEL ZINC HYDROXYSTANNATE-COATED FILLERS AS FIRE RETARDANT AND SMOKE SUPPRESSANT ADDITIVES FOR HALOGENATED POLYMERS Hornsby P R Cusack P A... 

Figure 13.8. The effect of a zinc hydroxystannate coating on limiting oxygen index. [Data from Baggaley R G, Hornsby P R, Yahya R, Cussak P A, Monk AW, Fire Mater., 21, 1997, 179-85.]...

Methods of filler pretreatment coating with thermoplastic polymer zinc hydroxystannate coating of fire retardant fillers increases their performance... 

Cusack, P.A. and Hornsby, P.R., Zinc hydroxystannate/zinc stannate-coated fillers Novel flame retardants and smoke suppressants for polymeric materials, J. Vinyl Additive Technol., 5, 21-30, 1999. 

Zinc borate is also an effective SS in combination with phosphate ester plasticiser (130). The combination of ammonium octamolybdate and zinc stannate is also beneficial (435). It has been shown that ATH and MDH functional fillers coated with zinc hydroxystannate give significantly increased combustion resistance and lower levels of smoke evolution (386). Copper (I) complexes have been suggested as smoke suppressants (241). Copper oxides have also been investigated with positive results (60). 

Consideration is given to the influence of combinations of zinc hydroxystannate (ZHS) with hydrated fillers, on the fire properties of plasticised PVC and polychloroprene. It is shown that magnesium and aluminium hydroxides specially coated with ZHS, confer significantly increased combustion resistance and lower levels of smoke evolution to these polymers. This permits large reductions to additive loading relative to unmodified filler, without sacrificing flame retardant or smoke suppressant performance. 10 refs. 

High efficiency in char formation is one of the reasons for the strong performance of Mg(OH)2 and A1(OH)3 as fire retarding additives. This performance can still be enhanced by surface coating the fillers with zinc hydroxystannate. Sb2O3 is volatized from the material and therefore does not affect char formation. Formation of char is an effective method of increasing the fire resistance of materials. The material which forms carbonaceous char has a reduced ability to supply the gaseous fuels required to fuel the fire. 

Zinc hydroxystannate was found to enhance the performance of Mg(OH)2 and A1(OH)3. Figure 13.8 shows the effect of filler coated with zinc hydroxystannate on... 

Zinc hydroxystannate smoke suppressant, paints/coatings... 

Keywords tin, tin oxide, zinc hydroxystannate, zinc stannate, organotin compounds, antimony trioxide, alumina trihydrate, magnesium hydroxide, titanium dioxide, molybdenum trioxide, iron oxide, zinc borate, alumina, halogenated flame retardants, metal halides, thermal analysis, Mossbauer spectroscopy, fire-retardant mechanism, ultrafine powders, coated fillers. 

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