The resistance of glass fiber mesh cloth to fire is quite serious. The material of glass fiber mesh cloth is glass fiber. Glass fiber itself is not easy to burn and has good alkali resistance. The heat insulation performance of mesh cloth is good, and it has the characteristics of good hardness and good dimensional stability. It has a similar expansion coefficient to bentonite with aluminum. It is a flame retardant material. When it burns, it produces only a small amount of carbon monoxide, toxic gas, and smoke quantity, low price, will not melt, has no distilled content, and its production cost is low. In 1942, an experiment was conducted on 300 grams of reinforced mesh cloth made of phenolic foam. During World War II, the Germans used phenolic foam as an early replacement for light-colored wood in the aviation industry. In the same period, the British Foam Rubber Company also developed phenolic foam, which was mainly used for mobility.
In 1945, the United States' United Carbide (branch) Company began to study the production process of low-density phenolic foam and resin. There are two methods for producing phenolic foam: dry and wet. The wet method uses phenolic resin as the basis, and the glass fiber self-adhesive tape has a foamable liquid resin system. This method is often used in Europe and the United States to produce phenolic foam products. The most representative companies of wet production of phenolic foam are the foams produced by the joint carbide (Nobel Explosives YiSiJi Mu (fen) and Icechim) companies. Their raw material synthesis and foam preparation technology are similar, but the method of controlling foam density is different. Dry phenolic foam is based on thermoplastic resin, and its foamable solid resin system is another production line that the former Soviet Union first developed. In the late 1950s, mass production was achieved. At present, the application of glass fiber cloth is also small. In the 1980s, foreign scientists studied phenolic resin products and found that they have outstanding flame retardant, low smoke, low toxicity and excellent heat resistance. Since the 1990s, including phenolic foam, phenolic composite has made great progress, first by the United Kingdom, the United States and other countries, has been applied to the military focus in aerospace, corner protection defense military field, and then applied to civil aircraft, ships, stations, oil wells and other places with fire protection requirements, gradually high-rise buildings, hospitals, sports facilities, etc. In 1961, our military industry college, phenolic foam dry 53 years old, studied plastics, and successfully applied to the military.
Since the 1980s, China has been in wet-phenolic foam plastics, and initially achieved industrial production in the early 1990s. Typical units (except military research institutions) are Jiqingnan University (formerly Shandong College, Beijing Building Materials), Chemical University, Shandong Shengquan Chemical Co., Ltd., Xiamen Gaote Materials Company, Shandong Jinguan Group, Shandong Huahai, etc. Phenolic foam is used in the temperature of early missiles and rocket heads. Mesh cloth corner protection. In recent years, due to the high-rise buildings, transportation, ships, aviation, aerospace technology and other aspects of the synthetic foam thermal stability and flame retardancy have put forward strict requirements, making the phenolic foam widely concerned and rapid development in communication. Now, as a new type of multifunctional phenolic foam, it has attracted great attention with its advantages of heat resistance, flame retardancy, self-extinguishing, flame retardant penetration, fire resistance and fire prevention without distillation. People realize that the use of its flame retardancy to make thermal insulation materials in the fields of high-rise buildings, heat insulation, and ultra-low temperature cold preservation has important practical value.
For various structures of human survival, safety issues have been included in the first batch. - Phenolic foam is a high-performance fireproof, heat-insulating, sound-insulating, and light-saving product with low thermal conductivity and a minimum density of only 30 to 40 kg/m3. The flame retardancy of phenolic foam is far less than that of polystyrene and polyurethane foam widely used in current buildings; after 10 minutes of 1700℃ flame spraying, a 24mm thick phenolic foam board is only slightly carbonized, but no surface is burned through, and it can neither attack nor emit smoke and gas. The French Building Technology Center has a comprehensive inspection of phenolic foam, which proves that it is good. For example, when the flame of the flame-resistant welding torch over 30°C is aimed at the foam board, no obvious burns are recorded after two minutes, and there is no high-temperature pyrolysis smoke.
