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A platform for research: civil engineering, architecture and urbanism
Low-smoke flexible PVC compounds via metal hydroxide as flame retardants
Metal hydroxide materials such as aluminium hydroxide (ATH) and magnesium hydroxide (MDH) provide good smoke suppression property to both flexible and rigid PVC compounds. The smoke performance as well as limiting oxygen index does not appear to depend on the particle size of ATH when the particle sizes are not too much different. Ground ATH and precipitated ATH seem to be similar in smoke suppression property. Vertex 100 MDH is more robust in suppressing smoke than ground ATH. It is possible to partially or entirely replace ammonium octamolybdate with ATH to achieve cost savings while keeping the smoke performance comparable in the flexible PVC applications. There may be a favourable synergism in smoke suppression between antimony oxide and ATH. The study shows that a ratio of antimony oxide to ATH in the range of 1/10 to 1/15 may provide enhanced smoke property. Increased use of antimony oxide, while costing more, does not appear to offer increased flame retardancy. Optimal use of antimony and ATH can effective reduce and delay the smoke generation. For the flexible PVC compound studied, it appears that there is no smoke performance synergism between ATH and MDH. But combined use of ATH with calcium carbonate can maintain LOI while only increasing the smoke slightly. This may provide a good means to optimize the compound cost vs. performance. The metal hydroxides can also impart good smoke performance to the rigid polyvinyl chloride (PVC). ATH appears to be more robust in reducing the smoke whereas MDH more robust in enhancing the limiting oxygen index (LOI). The potential synergism between ATH and MDH for the rigid PVC needs to be further investigated.
Low-smoke flexible PVC compounds via metal hydroxide as flame retardants
Metal hydroxide materials such as aluminium hydroxide (ATH) and magnesium hydroxide (MDH) provide good smoke suppression property to both flexible and rigid PVC compounds. The smoke performance as well as limiting oxygen index does not appear to depend on the particle size of ATH when the particle sizes are not too much different. Ground ATH and precipitated ATH seem to be similar in smoke suppression property. Vertex 100 MDH is more robust in suppressing smoke than ground ATH. It is possible to partially or entirely replace ammonium octamolybdate with ATH to achieve cost savings while keeping the smoke performance comparable in the flexible PVC applications. There may be a favourable synergism in smoke suppression between antimony oxide and ATH. The study shows that a ratio of antimony oxide to ATH in the range of 1/10 to 1/15 may provide enhanced smoke property. Increased use of antimony oxide, while costing more, does not appear to offer increased flame retardancy. Optimal use of antimony and ATH can effective reduce and delay the smoke generation. For the flexible PVC compound studied, it appears that there is no smoke performance synergism between ATH and MDH. But combined use of ATH with calcium carbonate can maintain LOI while only increasing the smoke slightly. This may provide a good means to optimize the compound cost vs. performance. The metal hydroxides can also impart good smoke performance to the rigid polyvinyl chloride (PVC). ATH appears to be more robust in reducing the smoke whereas MDH more robust in enhancing the limiting oxygen index (LOI). The potential synergism between ATH and MDH for the rigid PVC needs to be further investigated.
Low-smoke flexible PVC compounds via metal hydroxide as flame retardants
Erzeugung von raucharmen und flexiblen PVC-Verbindungen via Metallhydroxid als Brandverzögerer
Chen, Tong (author)
2006
9 Seiten, 4 Bilder, 7 Tabellen, 4 Quellen
Conference paper
English
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