POLYUREA : AN EFFECTIVE ELASTOMERIC POLYMER COATING FOR BLAST MITIGATION

In past few years, increment in terrorist activities, weapons and intentional or unintentional explosion hazards have caused a great threat to the life of people and vital structures. Thus, the need has arisen to work out best possible mitigation practices for diminishing the drastic effects of explosions. Any structure when loaded beyond its bearing capacity, it gets collapsed instantaneously. The main distinctive feature of blast load is that its time period of action is instantaneous while the pressure pulses generated during the blast are of very high magnitudes. These pressures pulses which are exerted abruptly for very short span of time (order of milliseconds) during the explosion are called impulsive pressure and very devastating in nature.  Generally it is found that almost many structures which we see around are not capable of bearing blast loads and so they get collapsed whenever explosion takes place. Other than structural collapse, fragments or debris of the exploded structure propagate in air and attack the occupants of the structure and other nearby public. This more devastating than pressure or thermal effects of blast. Efforts like modifications in structural analysis and design procedures, as well as design codes, besides identifying new structural retrofitting and strengthening methods have been done previously.

 

In recent years scientists have shown interest using elastomeric polymer coatings for retrofitting structures. Elastomers (an elastic polymer, ex. rubber) like polyurea and polyurethane are reported to have elongation capacity of 110 percent or more. This elastomer in form of coating can easily be sprayed over the face of the structure to be retrofitted. The characteristic like high tensile strength, elongation and capability to act as guard in absorbing shock waves (that are originated from blast) and capability of arresting the debris and fragments (broken pieces of structure) makes up the elastomeric coatings highly promising in blast or explosion mitigation. Due to additional properties of Polyurea coatings like durability and being impervious to water, these coatings are widely used as heavy vehicle bed liners and coatings for pipelines.

 

The perfect solution for Blast Mitigation, LIQUID ARMOUR introduced by HARDSHELL is 100% polyurea chemistry. It is specifically formulated for extreme, fast-setting, extreme outdoor conditions and colder substrate applications. It is a fast-set lining with superior hardness and elongation, high tensile strength, and excellent tear and abrasion resistance.‘LIQUID ARMOUR’ finds its application in diverse field of armoring marine or ground vehicles, buildings, culverts and trash cans in public areas. This coating can be camouflaged to a building’s exterior in order to disguise the fortification level to secure environment for political, government and executive residences and can be introduced into any stage of construction. Besides, it also imparts increased impact resistance for pipes, bridges, chemical tanks, and other potential hazards.

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