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Eco-friendly polymer-based 'nano intumescent', can be utilised as flame ret... (5-9-2011)
 
New flame retardant coating developed with water-based ingredients is much less toxic to humans than the so-called ‘halogenated’ or ‘brominated’ flame retardants used in the past, and they are more environmentally friendly. It has great potential for use as flame retardants on clothing and other materials in order to avoid some of the disadvantages of existing products.
Flame retardants are used on cotton, the most popular fabric in the world, because it can catch fire easily and burns rapidly with a hot flame. Flame retardants make it more difficult for fabrics to ignite, make them burn slower and make fabrics self-extinguish when the flame is removed. That margin of safety is especially important for clothing fires, which can cause severe and disfiguring injuries. Flame retardants allow time to remove the clothing or put out the flames. People are concerned about the potential toxicity of flame retardants that are currently used on a variety of products.
The research team from Texas A&M University, turned to a technology termed “intumescence,”- long used to fireproof exposed interior steel beams in buildings. At the first lick of a flame, intumescent coating swells up and expands like beer foam, forming tiny bubbles in a protective barrier that insulates and shields the material below. This work is the first demonstration of a polymer-based ‘nano intumescent’. The material is “nano,” or ultra-small, built up from layers of alternating positively and negatively charged polymers so thin that almost 50,000 would fit across the width of a human hair. Because these layers are so thin, the polymer liquid seeps deep into cotton fabric and onto each individual cotton fiber. Existing flame retardants, in contrast, simply settle on fiber bundles like armor and slow the spread of flames, but the fabric still burns and turns black. When the new nano coating is exposed to a flame, it expands slightly and stops the fire from igniting and burning the fabric — which remains white, except for the small area where the cotton directly touches the flame. The new flame retardant addresses public concerns about the potential toxicity of flame retardants now used on a variety of products, especially children’s pajamas and the foam inside children’s car seats and toys, and pointed out that the water-based polymers used in the nanocoating are much less toxic to humans than other flame retardants used today. The nano coating is deposited in alternate layers of positively and negatively charged polymers; swapping one of those polymers out for a different one in the recipe could offer similar anti-flammable protection while making the fabric softer.
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