Anvendelse af halogenfri flammehæmning i fiberarmerede polyethylen folier

Halogen-free Flame Retardants in Fibre-armed Tarpaulins

Summary and conclusions

A ~0,2 mm thin LDPE tarpaulin with a reinforcing mesh produced by Icopal Plastic Membranes A/S was flame retarded by addition of halogen-free flame retardants. The goal of the project was to flame retard the tarpaulins to pass the DIN 4102-B1 standard.

Ammonium polyphosphate, magnesium hydroxide, aluminium oxide hydroxide, N-alkoxy hindered amines (NOR), huntite/hydromagnesite and nano-composites were tested in different concentrations and grades. EVA was tested as a substitute for LDPE.

LPS 1215 (BS 476: Part 12: 1991), UL-94, LOI (Limiting Oxygen Index) and TGA were used to determine the efficiency of the halogen-free flame retardants.

Tensile stress and elongation were measured. SEM (Scanning Electron Microscope) was used to qualitatively characterise the dispersion of flame retarding additives.

The best flame retarded properties were achieved by addition of low amounts of N-alkoxy hindered amines (NOR). None of the tested formulations, however, could pass DIN 4102-B1. Additions of halogenfree flame retardants - even in amounts that were mechanically and economically unacceptable - did not retard the flaming properties of the tarpaulins to the specified level.

It can be concluded that addition of halogen-free flame retardants can reduce the amount of halogen-based additives in the tarpaulins without significantly changing the properties or price of the tarpaulins.