Determination of Surfactant Content of Efficient Environment-friendly Foam Fire Extinguishing Agent

When the mass fraction of the high-efficiency and environmentally friendly foam extinguishing agent surfactant is 1%, the experimental method is the same as before to test the effect of different content of alkyl glucosamine on the foam multiple and liquid separation time of the system.

When the glucosamine content is less than 1%, the foaming and foam stability of the system are very poor. When the mass fraction of glucosamine is greater than 1% but less than 2%, the foaming and foam stability of the system are significantly improved. When the content of glucosamine is more than 2%, the foaming and foam stability of the system are good. Therefore, the mass fraction of glucosamine should be higher than 2%.

Glucosamine (AGA) surfactant is a new generation grade green mild surfactant. In addition to the basic properties of traditional surfactants, they also have superior properties such as mildness, safety, high detergency, rich, delicate, stable foam, rapid and thorough biodegradation, and excellent synergistic effects, which can meet people's environmental protection Requirements.

Effect of surfactant content on surface tension of efficient and environmentally friendly foam fire extinguishing agent. When the mass fraction of glucosamine is 3%, the effect of surfactant content on the surface tension of the system is the same as before. With the increase of surfactant mass fraction, the surface tension of the system decreases. According to the calculation formula of the diffusion coefficient, the surface tension of the foam solution after the experiment is less than 22mN/m to ensure that the diffusion coefficient is positive. Therefore, the mass fraction of surfactant should be greater than 1.8%.

The above experiment is a single-factor multi-level experiment, and the interaction of the two factors is not considered. If we want to consider the interaction between glucosamine and surfactant, we should do orthogonal experiments. The experimental indexes were liquid separation time, foaming ratio, surface tension and interfacial tension. The experimental method is the same as before. Considering the importance of each index and the influence order of each factor on each index, the mass fraction of glucosamine is 2.5%, and the mass fraction of surfactant is 2%.

Determination of thickener content of efficient and environment-friendly foam fire extinguishing agent. Thickeners are mainly used to improve the stability of the foam. However, the thickener can increase the viscosity of the solution and thus can result in poor fluidity of the foam. Jin Ruiheng tested the effect of cationic guar gum, casein and xanthan gum on foam stability and fluidity. Xanthan gum has better foam stability than cationic guar gum and casein. Considering the fluidity of foam fire extinguishing agent, Jin Ruiheng chose xanthan gum as thickener, and the mass fraction of xanthan gum was 1%~ 0.2%.

The foam extinguishing agent is composed of 2.5 hexosamide, 2% surfactant, 0.1 xanthan gum (mass fraction), and the rest is water. The test is carried out according to the requirements of the GB15308-2006. The fire extinguishing time is 2.5min, reaching the first level of fire extinguishing performance. The fire prevention time is 6 minutes, reaching the fire prevention grade D. Meet the fire extinguishing performance requirements of low expansion foam liquid to non-water soluble liquid fuel.