The mesh cloth used for the exterior wall has a very serious resistance to fire. The mesh cloth is made of glass fiber. The glass fiber itself is not easy to burn. It has good alkali resistance. , using aluminum-like bentonite expansion coefficient, which is a flame-retardant substance, produces only a small amount of carbon monoxide poisonous gas when burned, the amount of smoke, low price won't melt, no content obtained by distillation, and its production cost is low. 1942, -- 300 grams of reinforced grid cloth made of phenolic foam experiment. In World War II, the Germans would phenolic foam, an early replacement for light-colored wood for the aviation industry. During the same period, the British foam rubber company also developed - phenolic foam, mainly for flow. In 1945, United States Carbide (Branch) Co., Ltd. began to study the production process of low-density phenolic foam and resin. There are two methods of production of phenolic foam, dry and wet. The wet method is based on the phenolic resin, and the glass fiber self-adhesive with its expandable liquid resin system. This method is often used in Europe and the United States to produce phenolic foam products. Wet production of phenolic foam, the representative company, joint cemented carbide (Nobel Dynamite YiSiJi mu (sub) and Icechim) foam produced by the company, its raw material synthesis and foam preparation technology are similar, but the method of controlling the foam density is different. Dry phenolic foam is based on thermoplastic resin, and its expandable solid resin system was the first to develop another production line in the former Soviet Union. It was mass-produced in the late 1950s, and the current Y glass fiber cloth is relatively small. In the 1980s, foreign scientists studied phenolic resin products and found that they had outstanding flame retardancy, low smoke, low toxicity, and excellent heat resistance. Since the 1990s, phenolic foams and phenolic composites have made great progress, first by the United Kingdom, the United States, and other countries, and have been used in military fields, focusing on aerospace, corner protection, and military, and later in civil aircraft. , Ships, stations, oil wells, and other fire-fighting requirements, and gradually high-rise buildings, hospitals, sports facilities, etc. In 1961, our Ordnance Industry Institute - phenolic foam was 53 years old, studied plastics, and successfully applied it to the military.
Since the 1980s, China has been developing wet-phenolic foam plastics and initially realized industrial production in the early 1990s. Typical units (except military research institutions) include Jiqingnan University (formerly Shandong Institute of Beijing Building Materials), University of Chemical Technology, Shandong Shengquan Chemical Co., Ltd., Xiamen Gaote Materials Co., Ltd., Shandong Jinguang Group, Shandong Huahai, etc. The phenolic foam was applied to the temperature of early missiles and rocket heads. In recent years, because high-rise buildings, transportation, ships, aviation, aerospace technology, and other aspects have put forward strict requirements on the thermal stability and flame resistance of synthetic foams, phenolic foams have attracted widespread attention and rapid development of communications. Now, as a new type of multifunctional phenolic foam, it has attracted people's attention for its advantages of heat resistance, flame retardancy, self-extinguishing, flame retardancy, fire resistance, content in fire, and prevention of fire spreading without distillation. Mesh cloth has been recognized by people to use its flame resistance to make thermal insulation materials have important practical value in the fields of high-rise buildings, heat insulation, and low-temperature insulation.
For various structures of human existence, safety issues have been included as important. ——Phenolic foam is a high-performance fireproof, heat insulation, sound insulation, light, and energy-saving product. It has low thermal conductivity and the lowest density is only 30-40 kg/m3. The flame retardant degree of phenolic foam is polystyrene widely used in construction Vinyl, such as polyurethane foam, is far behind; 24 mm thick phenolic foam boards are only slightly carbonized after flame spraying at 1700 ° C for 10 minutes, but no surface is burned through, and they can neither attack nor emit smoke and gas. The French Building Technology Center owns one - phenolic foam for a comprehensive inspection and inspection, which proves that it is good, such as flame resistance. The flame over 30 ℃ from the welding torch is aimed at the foam board. After two minutes, no obvious burns have been recorded. Come back, there is no high-temperature pyrolysis fume.
