Quimica, Chemistry: Development of Fire formulations for polyolefins

Development of Fire formulations for polyolefins
Since its inception, Gaiker has worked to develop screenings fireproofing for the manufacture of products for extrusion and injection for the sectors of automotive, electrical-electronics and construction. As examples of possible final destinations of these materials are: fireproof panels for construction, coatings power cables cars, profiles and tubes fireproofing for the electricity sector.
Recent activities in this area have been focused on the development of compounds with parent olefins, nanoparticles minerals and expandable graphite, as burdens ignifugantes novel and halogen-free.
The nanoparticles used in the development of these compounds are clay, in particular, montmorillonite, with laminar structure. Theoretically, sheets, forming a network during the three-dimensional progress-fire by promoting the formation of a crust that prevents subsequent dripping polymer burning.
The expandable graphite, the special offers to expand dramatically. When an outbreak is subjected to heat, were charred and forms a protective thermal barrier that reduces the amount of heat and gases that are generated, which are responsible for continuing the combustion process.
The high expansion of graphite, between 150 and 250 times its volume at high temperatures, reduces load levels to add. It is compatible with other additives retardant and can act synergistically with them.
With the combination of nanoparticles and expandable graphite, has tried to take this action ignifugante of graphite and action antigoteo of nanoparticles, to obtain screenings polyolefins fireproofing and high performance with low percentages of conventional cargo ignifugante.

He then outlined the results of comparative 4 formulations fireproof Polypropylene (PP), by referring to the DB without additives. These formulations are:

DB + 55% Mg (OH) 2
DB + 5% nanoparticles (NNP) + 25% Mg (OH) 2
DB + 5% expandable graphite (graf) + 25% Mg (OH) 2
DB nanoparticles + 5% + 5% + 20% expandable graphite Mg (OH) 2
The previous mixtures have been prepared by double-screw extruder co-rotating, and have been subjected to various tests to assess their characteristics compared with fire (and speed indicators Oxygen's Liberation heat generated) and its mechanical properties in traction.