Shanghai Dadong Wood Technology Co., Ltd. tells you: Wood flame retardant What's your personality?
In the 4th century B.C., the ancient Romans used vinegar and then alum solution to soak wood to enhance its fire resistance. In ancient Greece, Egypt and China, it was also impregnated with sea water, alum and brine to improve the fire resistance of wood. But until the 15th and 16th century, the methods of flame retardant treatment were relatively simple. It was not until the 17th and 18th centuries that there were patented flame retardants and treatment methods. However, as an industrial technology, wood flame retardant was first developed in some advanced industrial countries in Europe and the United States until the end of the 19th century and the beginning of the 20th century. In the 1940s, the need of war accelerated the development of this industry; In the 1950s and 1960s, inorganic salts were still the main flame retardants, but more and new composite flame retardants were used to enhance the flame retardant effect. Since 1960s, the development of flame retardants, especially resin flame retardants, has provided the possibility to overcome the shortcomings of easy loss and moisture absorption of inorganic salts.
The mechanism of wood combustion and flame retardancy: when the wood meets the high temperature of 100 ℃, the moisture in the wood begins to evaporate; When the temperature reaches 180 ℃, combustible gases such as carbon monoxide, methane, methanol and tar with high burning point begin to decompose; When the temperature is above 250 ℃, the wood pyrolysis is rapid and a large amount of combustible gas is released, which can ignite and burn under the action of oxygen in the air; At 400-500 ℃, the wood composition is completely decomposed and the combustion is more intense. The maximum temperature of combustion can reach 900 ~ 1100 ℃.
When the wood is burned, the surface layer gradually carbonizes to form a carbonized layer with lower thermal conductivity (about 1 / 3 ~ 1 / 2 of the thermal conductivity of wood). When the carbonized layer reaches a sufficient thickness and remains intact, it becomes an insulation layer, which can effectively limit the speed of heat transfer to the interior, so that the wood has good combustion resistance. Taking advantage of this characteristic of wood, and taking appropriate physical or chemical measures to isolate it from combustion source or oxygen, it is possible to make wood non combustible, refractory or block the spread of flame, so as to achieve flame retardant effect.
Shanghai Dadong Wood Technology Co., Ltd Wood preservation Wood fire retardant Ultra high temperature heat treatment of wood 、 Wood preservatives It is a modern science and technology enterprise integrating research and development, production, sales and installation of high-tech materials and new products such as wood structure buildings. It is a "high-tech enterprise", "innovative enterprise" in Shanghai, a "famous brand enterprise" in China's wood protection industry, and one of the top ten enterprises in China's wood preservation industry. It is the vice president unit of China Wood Protection Industry Association, vice chairman unit of anti-corrosion Professional Committee of China timber and wood products Circulation Association, member unit of China timber Standardization Technical Committee, Central Committee of Communist Youth League and "youth employment and entrepreneurship internship base" of Nanjing Forestry University. Welcome to inquire: 1331010088