Hello everyone, now Daer Chemical introduces the flame retardant principle of leather flame retardants. The combustion and flame retardancy of substances are very complicated processes, involving many influences and constraints. We can idealize the flame retardant mechanism of flame retardants into the following three types: 1 The flame retardant materials generate free radical inhibitors when heated or burned, so that the combustion chain reaction is interrupted. 2Flame retardant materials generate fine particles when heated or burned, which promotes the mutual binding of free radicals and leads to the termination of combustion. 3 Fire-retardant materials generate a large amount of inert gas or high-density steam when heated or burned, which plays the role of diluting and isolating combustible gas or lowering the temperature, leading to the termination of combustion.

       Condensed phase flame retardant In the condensed phase, the flame retarding effect that retards or interrupts the thermal decomposition of combustible materials, such as phosphorus flame retardants. Flame retardants retard or prevent the generation of flammable gases and free radicals in the solid phase. The development of leather flame retardant technology mainly lies in the research and development of leather special flame retardants and the formulation of flame retardant tanning technology. At the same time, the corresponding flame retardant performance testing methods are improved to attach importance to the flame retardant modification of retanning agents, fatliquors and finishing agents. That is, flame retardant elements are introduced into the molecules of the retanning agent fatliquor and the finishing agent.

       The flammability evaluation of leather flame retardants usually uses the vertical combustion test method and the aerobic index test method. Although these two methods still have some limitations. That is, the development of intumescent flame retardants is emphasized. Phosphorated halogenated modification of synthetic fatliquoring acrylic resins and protein-based finishing agents and synergistic modification of multiple flame retardant elements, and the development of low-smoke and low-toxicity environmental protection for leather High-efficiency flame retardants apply nanotechnology to the study of leather flame retardants. The establishment of leather flame retardant technology is the key to the development of leather flame retardant technology. Establishing a comprehensive characterization method and standard for leather flame retardant properties. The purpose is to measure the time required for the flame to extinguish after the combustion source is removed and the time required for the embers to completely extinguish. At the same time, the remaining length of the sample and the percentage of weight lost after combustion are measured. The smaller these parameter values are, the leather indicates The better the flame retardancy of the flame retardant.