Coating classification: thin tunnel fire retardant coating

Core tip: Introduction: With the rapid development of China's economic construction, there are more and more expressways and railway tunnels The tunnel structure is generally made of stone and reinforced concrete In case of fire, it not only seriously threatens people's life, but also causes great damage to traffic facilities and human production activities It has been proved that when the temperature of tunnel fire rises to 600 ℃, the loss of concrete strength is more than 50%, the yield stress of steel is less than 1 / 3 of that at normal temperature, the duration of fire in tunnel is more than 90 minutes, the temperature is more than 1000 ℃, and the tunnel is built Paint knowledge how about Akzo Nobel Powder Coating Recommended introduction: powder coating is a kind of coating with different form from general coating, which is in powder form It is a new type of coating, because of its own advantages and more and more known by people Let's introduce Akzo Nobel Powder coating Akzo Nobel Powder coating is a cost-effective coating solution, which can be applied to different kinds of products After the treatment of static electricity and fire baking, a tough and durable coating surface will be formed, with the least impact on the environment Since the introduction of this technology, powder coating has been able to continue to maintain the Introduction: with the rapid development of China's economic construction, there are more and more expressways and railway tunnels The tunnel structure is generally made of stone and reinforced concrete In case of fire, it not only seriously threatens people's life, but also causes great damage to traffic facilities and human production activities It has been proved that when the temperature of tunnel fire rises to 600 ℃, the loss of concrete strength is more than 50%, the yield stress of steel is less than 1 / 3 of that of normal temperature, the fire duration is more than 90 minutes and the temperature is as high as 1000 When the temperature is above ℃, the tunnel masonry is hard to bear such high temperature, and the serious part is easy to burn or burst In addition, the tunnel environment is relatively closed, and the density of people flow is large Once a fire occurs, it is very difficult to evacuate and put out, and it is easy to cause heavy casualties and property losses Therefore, it is very important to carry out fire prevention treatment for the tunnel Thin fire-proof coating for tunnel is suitable for fire-proof coating protection of highway and railway tunnels It has thin coating, long fire-proof time, high bond strength, aging resistance and water resistance, environmental protection, non-toxic, and simple construction Technical requirements: the tunnel is a reinforced concrete structure In addition to the prevention of hydrocarbon fire, the following technical requirements shall be met for the thin tunnel special fire retardant coating, taking into account the characteristics of the tunnel environment, such as large humidity, large temperature change, severe vibration caused by driving, difficult emission of smoke and dust, and large noise inside the tunnel ① The paint solidifies and dries quickly in humid environment, and has good adhesion with concrete; ② the paint shall meet the requirements of environmental protection, the paint will not decompose and release toxic and harmful gases under high temperature, and the toxicity shall reach AQ-1 level, meeting the requirements of environmental protection; ③ The coating has good water resistance, alkali resistance, freeze-thaw resistance, damp heat resistance, and the fire-proof coating in the high cold area should also have antifreeze performance ④ The construction method is simple, easy to operate and efficient Raw materials: ① the composite binder is composed of silicic acid cement, high aluminum cement and redispersible rubber powder The binder is mainly Portland cement, compounded with appropriate high aluminum cement and redispersible rubber powder, and added with appropriate permeable crystalline active masterbatch, which greatly improves the water resistance, permeability and durability of tunnel fire retardant coating ② The fire-resistant and heat-resistant materials, such as aluminum silicate fiber, sepiolite, vermiculite, expanded perlite, hollow glass bead, light calcium carbonate, should have the characteristics of high temperature resistance, low density and small thermal conductivity The coating is made of aluminum silicate fiber, sepiolite, vermiculite, expanded perlite, hollow glass bead and light calcium carbonate ③ Fire resistant and flame-retardant materials include antimony oxide, aluminum hydroxide, magnesium hydroxide, zinc borate, etc aluminum hydroxide and magnesium hydroxide are halogen-free materials They decompose at high temperature, generate water vapor and absorb a lot of heat They also have the functions of reducing toxic gas and smoke, cooling and extinguishing fire The coating uses antimony oxide, aluminum hydroxide, magnesium hydroxide and zinc borate as fire-retardant materials ④ In order to meet the needs of practical construction, chemical auxiliaries such as early strength agent, water repellent agent and foaming agent are added to the thin tunnel fire retardant coating, which can not only enhance the fire resistance of the coating, but also improve the construction performance of the coating Formula design: production process: ① screening of raw materials: screening of refractory and thermal insulation materials to remove coarse particles to avoid blocking the raw material pipeline and spray gun during spraying construction; ② fully mixing Portland cement, high aluminum cement and redispersible rubber powder to disperse evenly; ③ In the above mixture, aluminum silicate fiber, sepiolite, vermiculite, expanded perlite, hollow glass beads, light calcium carbonate and other heat insulation materials are added in turn, and then all kinds of fire-resistant and flame-retardant materials are added after being evenly dispersed, finally all kinds of chemical auxiliaries are added, and the materials are discharged and packed after being evenly mixed ④ Because the fire-resistant and heat-insulating materials obtained in the thin fire-proof coating for tunnel are easy to absorb moisture, the product packaging shall be well moisture-proof Performance test: according to ga98-2005 "fire retardant coating for concrete structure" and "technical requirements for fire retardant coating for tunnel" proposed by Sichuan Fire Research Institute of the Ministry of public security, the test results are as follows: The thin fire-retardant coating for tunnel has excellent bonding strength Under the action of vehicle vibration and external force, the coating has good stability When a fire occurs, a longer fire-resistant time is conducive to fire protection and reduce the disaster, shorten the repair time and reduce the property loss Home of coatings is specialized in coatings, diatom mud, paint coating, coating technology, fire retardant coating news and coating, diatom mud, paint coating, coating technology, fire retardant coating decoration knowledge and decoration renderings,