Fluorine-free high-stability MJABP type A-type foam extinguishing agent and preparation method thereof

The invention discloses a fluoride-free high-stability MJABP type A-type foam extinguishing agent and a preparation method thereof. The class-A foam extinguishing agent comprises the following components in percentage by mass: 10%-15% of a first compound system, 30%-40% of a second compound system, 3%-5% of a third compound system, 5%-10% of a fourth compound system, 0.5%-1% of a foam stabilizer, 0.6%-1% of a high-temperature-resistant agent, 1%-5% of an organic phosphorus-containing flame retardant, 3%-6% of a cosolvent, 0.4% of a preservative, 0.01%-0.1% of a pH regulator and the balance of water. And the balance of water. The first group of compound system is formed by compounding an organic silicon surfactant, the second group of compound system is formed by compounding a hydrocarbon surfactant, the third group of compound system is formed by compounding a wetting agent and a penetrating agent, and the fourth group of compound system is formed by compounding urea and ammonium chloride. The fluorine-free h