In this paper,polyether-modified trisiloxane and CTAB as surfactants,and nano-magnesium hydroxide and xanthan gum as stabilizing agent were prepared for preparation of fluorine-free foam fire extinguishing agent.L9(34)orthogonal table was used to analyze surface tension,foaming performance and foam stability of foam solution,and orthogonally optimized foam formula was selected for fire fighting and anti-burning experimental research.The results showed that the viscosity of the compound system was low between 1.00-1.21mPa·s.The foam solution composed of CTAB with mass fraction of 0.8％and 12％polyether-modified trisiloxane had the lowest surface tension of 19.73mN/m.Polyether-modified trisiloxane cooperated with CTAB to enhance the solution foaming performance and foam stability.When the mass fraction of nanometer magnesium hydroxide was 0.5％,the solution foaming was highly optimal,reaching 207mm,and the 25％solution time increased from 205s to 216s.The foam fire extinguishing agent prepared with the mass fraction of 1.2％CTAB,12％polyether-modified trisiloxane,0.5％nano-magnesium hydroxide and 0.05％xanthan gum was used to extinguish the n-heptane fire with the oil pan area of 0.25m2,and the fire extinguishing time was 107s with the anti-burning time of 372s.
维普
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