Fireproof coatings produced using magnetic nanoparticles
Researchers from Kashan University, Iran, succeeded in the production of fireproof coatings by synthesising a type of magnetic nanoparticle and using it in a nanocomposite structure.
Fireproof is a term used for a wide range of chemicals that are added to synthetic materials, including plastics, fabrics and coatings. These materials prevent the extension of flame by stopping a number of chemical reactions in the flame and creating a protecting layer on the surface. These materials may combine with the matrix or create a chemical bond with it.
Non-toxic replacement for usual materials
This research introduces an effective non-toxic replacement for the usual fireproof materials such as carcinogenic aromatics containing halogens as the filler of polyvinyl alcohol. Polyvinyl alcohol is a commonly-used polymer with many applications in various industries. Relatively low resistance to heat and high flammability are the main disadvantages of this polymer.
Decreasing the rate of polymer degradation
Usual fillers weaken the mechanical properties of polyvinyl alcohol due to the inappropriate dispersion and the creation of two-phase structure. The application of nanoparticles and creation of nanocomposite structure prevents this problem, and it decreases the rate of polymer degradation against heat.
Tests were carried out
Iron oxide magnetic nanoparticles have been firstly synthesised through simple chemical deposition method, and the effects of various parameters, including concentration and ratio were studied on the morphology of nanoparticles. Then, nanoparticles were produced through in-situ polymerisation in aqueous solution of polyvinyl alcohol without the need for atmosphere. Fire resistance and late burning tests were finally carried out.
Results of the research have been published in Particuology, Vol. 26, 2016, pp. 87-94.
