Research of the insulating properties of the rapid-hardening foam

 

Ruslan Pietukhov

National University of Civil Defenсe of Ukraine

http://orcid.org/0000-0002-0414-2546

 

Oleksandr Kireev

National University of Civil Defenсe of Ukraine

http://orcid.org/0000-0002-8819-3999

 

Evgen Slepuzhnikov

National University of Civil Defenсe of Ukraine

https://orcid.org/0000-0002-5449-3512

 

Oleksandr Savchenko

National University of Civil Defenсe of Ukraine

https://orcid.org/0000-0002-1305-7415

 

Maryna Chyrkina

National University of Civil Defenсe of Ukraine

http://orcid.org/0000-0002-2060-9142

 

DOI: https://doi.org/10.52363/2524-0226-2021-33-7

 

Keywords: rapid-hardening foam, carboxymethylcellulose, gelation, insulating properties, toxic agent, benzene, flotation

 

Abstract

In the work it is offered to use rapid-hardenind foam received on the basis of gel-forming system Na2O•nSiO2 (9 % р-н) + NaHCO3 (9 % р-н) as an effective insulating agent against vapors of organic toxic liquids. Benzene was selected as the tested toxic liquid. A study of the buoyancy of rapid-hardenind foam on the surface of benzene. The process of flooding of rapid-hardenind foam has been studied. It was found that rapid-hardenind foam retains its integrity and buoyancy for more than 2 days without repeated application to the surface of benzene. The insulating characteristics of rapid-hardenind foam were studied by two methods. The first is a method of fixing the weight loss of benzene. The second is a method of measuring the concentration of benzene vapor above its surface using a portable multi-channel gas analyzer Dräger X-am 7000 (Germany). To increase the stability and insulating properties of rapid-hardenind foam, it is proposed to add a water-soluble polymer sodium salt of carbome-thylcellulose to the gel-forming system. It is established that the system has the highest stability and the greatest insulating properties Na2O•nSiO2 (9 % solution) + NaHCO3 (9 % solution) + carbomethylcellulose (0,5% vol.) +foaming agent «Morskoy» (6% vol.). The proposed insulating agent is similar in insulating properties to the previously proposed insulating materials based on silicates, but has the advantage over them in greater ease of application to the liquid layer. The results show that the foam with a thickness of 5 cm slows down the evaporation of benzene by 9 times and reduces the concentration of benzene vapor above the surface of the rapid-hardenind foam at a height of 2 cm by 5 times. It is concluded that it is expedient to use this rapid-hardenind foam to eliminate the consequences of emergencies related to the spillage of toxic liquids.

 

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