Hubei Meituo Coating Co., Ltd. is mainly engaged in fire retardant coating production, fire retardant coating construction, fire retardant coating engineering, steel structure fire retardant coating construction, steel structure fire retardant paint construction, including exterior wall paint renovation, floor paint construction, fire retardant paint construction, etc. The company's products include architectural coatings, fireproof coatings, anti-corrosion coatings, industrial coatings, floor coatings and other products. Company to "serve the public, benefit sharing" as the development policy, adhere to the "technological innovation, quality-oriented, honest service" business philosophy, focus on the application and research of coating technology, committed to the use of global innovative technology, and has a strong service team dedicated to serve you. With superior product quality, "Meitu Master" coating has been loved and trusted by people, and has become a reliable coating supplier for professionals. "Meitai Master" coatings with "high standard service" as the purpose, with good products for people's lives, to promote the harmonious development of human and environment contribution.
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Ultra-thin steel structure fire retardant coating refers to the coating thickness of no more than 3mm steel structure fire retardant coating, this kind of fire retardant coating expansion foam, the formation of dense fire insulation layer, is a new variety developed in recent years. It can be sprayed, brushed or rolled, and is generally used in construction steel structures requiring a fire resistance limit of less than 2h. Compared with thick-coated and thin-coated steel structure fireproof coatings, ultra-thin expanded steel structure fireproof coatings have finer viscosity, thinner coating, convenient construction and better decoration. While meeting the requirements of fire prevention, it can also meet the high decorative requirements, especially for the exposed steel structure, this type of coating is a steel structure fire retardant coating favored by users. Due to the short time of domestic research on ultra-thin steel structure fire retardant coatings, although the research on the fire resistance and physical and chemical properties of the coating film has made rapid progress, but in order to propose an excellent effect suitable for outdoor application of ultra-thin steel structure fire retardant coatings, it is still necessary to do further research on its weather resistance. Foreign steel structure fire retardant coatings have been developed in the direction of ultra-thin, ultra-weatherability and excellent decorative performance, and the weather resistance experiment has been carried out with reference to the European aging test standard method, and the weather resistance is excellent, and the weather resistance of its coating film can meet the requirements of outdoor use. Therefore, in order to catch up with or exceed similar foreign products and meet the needs of the market, the development and development of outdoor ultra-thin steel structure fire retardant coatings with high weather resistance is the direction of future development.
Second, the surface layer is generally coated 1 to 2 times, and should cover all the bottom layer. The amount of paint is 0.5~1kg/㎡.
Fire retardant coating is composed of coating components such as base material (i.e., film-forming substance), pigment, common coating additives, fire retardant additives and dispersion medium. In addition to fire protection additives, the role of other coating components in coatings is the same as that in ordinary coatings, but some have special requirements in performance and dosage.
Fire burning
First, when the steel substrate surface rust and anti-rust treatment meet the requirements, dust and other debris can be cleaned before construction.
Fourth, the operator should carry a thickness measuring needle to detect the thickness of the coating and ensure that the spraying reaches the thickness specified in the design. Fireproof coating construction technology,
Article 3.3.1 The bottom coating (or main coating) of the fire retardant coating of the thin-coated steel structure should be sprayed with a gravity spray gun, and the pressure is about 0.4MPa. For local repair and small area construction, it can be applied by hand. Finish coatings can be freshly applied, sprayed or rolled.
First, the outsourcing layer. It is to add an outsourcing layer on the surface of the steel structure, which can be cast in situ and can also be sprayed. Cast-in-situ solid concrete cladding is usually reinforced with wire mesh or steel bars to limit shrinkage cracks and ensure the strength of the shell. The spraying method can apply a sand pump to the surface of the steel structure at the construction site to form a protective layer. The sand pump can be lime cement or gypsum mortar, or it can be mixed with perlite or asbestos. At the same time, the outer layer can also be made of perlite, asbestos, gypsum or asbestos cement, light concrete to make prefabricated panels, using adhesives, nails, bolts fixed on the steel structure.
Article 3.4.6 When the fireproof coating appears in one of the following circumstances, it shall be re-sprayed:
Article 3.4.2 When dosing, the material or diluent should be added strictly according to the mix ratio, and the consistency should be appropriate, and it should be used while matching.
Why do some fireproof coatings burn in case of fire? To explain this problem, we first look at the fire retardant coating by the base material, dispersion medium, flame retardant, solvent and so on. The fire retardant coating before construction burns in the event of fire, in fact, the flammable liquid solvent in the fire retardant coating is burning, and the base material of the fire retardant coating, flame retardant and other substances will not burn. Because solvent-based fireproof coatings use organic solvents as solvents, such as No. 200 solvent gasoline, n-butanol, acetone, cyclohexanone, toluene, etc., these fireproof coatings are easy to cause fire once they leak out of the barrel. The fireproof coating applied to the building components can only play the role of fire resistance and heat insulation after the solvent has evaporated.
1. Can make a preliminary inspection of the quality of the product on the site: cut 2 ~ 3 samples on the base material that has been constructed, or take a small amount of samples and paint on 2 ~ 3 pieces of 150mm×150mm plywood, according to the actual construction situation. When dry, check with the flame of an alcohol lamp. The flame height is about 40mm, the time of applying the flame is generally 20min, and the foaming of the coating is checked. Under normal circumstances, according to the specified amount (generally 500 grams/square meter) construction, the layer thickness of the first grade fireproof coating is more than 20mm, and the layer thickness of the second grade fireproof coating is more than 10mm. Scraping and coating method: The use of metal or non-metal scrapers, such as hard rubber sheets, glass steel scrapers, horn scrapers and other manual scraping, for scraping a variety of thick paste type fire retardant coatings and putty.
Fireproof paint construction environment
Fireproof coating is a kind of special coating used for the surface of flammable substrate, which can reduce the flammability of the surface of the coated material, block the rapid spread of fire, and improve the fire resistance of the coated material. Applied to the surface of flammable substrate to change the burning characteristics of the material surface and prevent the rapid spread of fire; Or applied to building components to improve the fire resistance of the components of the special coating, called fire retardant paint.
Fireproof coating for finishes; Fireproof paint for wood; Steel structure fire retardant coating, concrete structure fire retardant coating, tunnel fire retardant coating, cable fire retardant coating.
First, when the bottom thickness meets the design requirements and is basically dry, the surface layer can be constructed.
5, when the design requires the coating surface to be smooth and smooth, the last coating should be smoothed to ensure that the outer surface is uniform and smooth.
Is it good to use fireproof coatings to improve the fire resistance of building components? With the development of flame retardant science in China, advanced, high-quality fire retardant coatings came into being, from the normal application situation, the effect is obvious.
Spraying method: The use of compressed air and spray gun to atomize the paint construction method, it is characterized by uniform coating quality after spraying, high production efficiency. The disadvantage is that a part of the paint is lost, and at the same time, due to a large amount of evaporation of the solvent, it affects the health of the operator. The key equipment of air spraying is the spray gun. Spray gun according to the paint supply method is usually divided into gravity type, suction type and pressure type 3, and according to the spraying capacity is divided into small and large two categories. The viscosity of the coating is high, the air pressure is large, and the nozzle should be of large caliber; The viscosity of the coating is low, the pressure is small, and the nozzle can be selected with small caliber. The air pressure of air spraying is generally 0.3~0.6MPa.
(2) Fireproof coating has low thermal conductivity, delaying the conduction rate of high temperature to the substrate; (4) When the thickness of the coating is less than 85% of the thickness specified in the design, or when the thickness of the coating is greater than 85% of the thickness specified in the design, but the length of the continuous area of the coating which does not reach the specified thickness exceeds 1m.
It is required that the mixed slurry be aged for 15-25 minutes before construction to ensure that the slurry achieves better construction viscosity. 2. It is required to determine the amount of coating prepared according to the construction capacity, which can be used with it. The prepared paint should be used up within 120 minutes and cannot be used again after solidification. 3. It is recommended to use spraying construction method for the construction, the coating thickness is not more than 5 mm, the second time can be sprayed or coated, the coating thickness is not more than 10 mm each time, the interval time is 24 hours, until the design thickness is not less than 13.3 mm. 4. The ambient temperature of the construction site is required to be 5-38 ° C, and the relative humidity is not more than 85%. The curing period of physical and chemical properties inspection is 28 days, and the curing period of fire resistance inspection is 40 days. 5. If it is painted outdoors, after the coating is basically dry, acid - and alkali-resistant modified acrylic coating must be applied on the surface of the fireproof coating to protect it. 6. The undried coating shall not collide, wash and rain.
High-rise steel structure buildings are increasing, especially some super high-rise buildings, the use of steel structure materials is more extensive. Once a fire accident occurs in a high-rise building, the fire can not be extinguished in a short period of time, which requires us to increase the fire protection of building materials in the design of the building, to enhance its fire resistance limit, and formulate the necessary emergency programs in the building to reduce casualties and property losses. Fireproof coating package acceptance
5. According to the standard, in addition to meeting the fire resistance requirements, the combustion performance of fireproof coatings is divided into one and two levels. Under the specified experimental conditions, the fire resistance time of the primary fire retardant coating is not less than 180 minutes, and the heat resistance time of the secondary fire retardant coating is not less than 120 minutes. Users should pay attention to distinguish when choosing, to avoid the enterprise shoddy, can not achieve the fire protection effect.
Third, the surface layer should be uniform in color and flat.
Decorative fireproof coatings are generally used as protective materials for combustible substrates, with certain decorative and fireproof properties, and are divided into two categories: water-based and solvent-based. The steel structure fire retardant coating is mainly used as a protective material for non-burning body components, this kind of fire retardant coating coating is relatively thick, and the density is small, low thermal conductivity, so it has excellent thermal insulation performance, and is divided into organic fire retardant coating and inorganic fire retardant coating. Filling water (water jacket), filling water in hollow steel structure is the most effective protection measure against fire, this method can make the steel structure in the fire to maintain a low temperature, water circulation in the steel structure, absorb the heat of the material itself. After cooling, the heated water can be recirculated, or cold water can be introduced by pipes to replace the heated water.
As a form of high-rise building structure, steel structure is widely used in the construction industry because of its high strength, light weight, good extensibility, shock resistance and short construction period, especially in the super high-rise and long-span buildings, showing strong vitality. By the end of 1990, steel structure accounted for 79% of the 100 super high-rise buildings more than 200m high in the world. Since the reform and opening up, with the strengthening of international technical exchanges and cooperation, steel structure application technology has been booming in China, and high-rise and super high-rise buildings have grown rapidly. According to statistics in 1995, 37% of the 100 super high-rise buildings built in China were steel structures, most of which were built in recent years. With the development of China's urban scale, the application of steel structure in China's construction industry has a very broad prospect. However, because the steel structure itself is non-combustible, the problem of fire insulation protection of steel structure was once ignored. According to the relevant data reports at home and abroad and the tests and statistics of relevant institutions, the fire resistance of steel structure is worse than that of masonry structure and reinforced concrete structure. The mechanical strength of steel decreases with the increase of temperature, at about 500℃, its strength drops to 40% ~ 50%, the mechanical properties of steel, such as yield point, compressive strength, elastic modulus and load capacity, etc., are rapidly decreased, and soon lose the support ability, resulting in the collapse of the building. Therefore, it is imperative to protect the steel structure. Steel structure fire retardant coating brush or spray on the surface of the steel structure, the effect of fire insulation, to prevent the steel in the fire rapidly heating up and reduce the strength, to avoid the steel structure to lose support and lead to the collapse of the building. As early as the 1970s, foreign research and application of fireproof coatings on steel structures have carried out active work and achieved better achievements, which is still in the ascendant. In the early 1980s, foreign steel structure fireproof coatings entered the Chinese market and were applied in engineering. Since the early 1980s, China has also begun to develop fireproof coatings for steel structures, and many excellent varieties have been widely used in all walks of life.
The fire insulation principle of the thick steel structure fire retardant coating on the steel member is that the fire retardant coating is basically no volume change when the fire retardant coating is subjected to fire, but the thermal conductivity of the coating is very low, delaying the speed of heat transfer to the protected substrate, and the coating itself is non-combustible, which acts as a barrier and prevents thermal radiation on the steel member, avoiding the direct attack of flame and high temperature on the steel member. There are some components in the paint in the fire to react with each other to generate non-flammable gas process is endothermic reaction, but also consumes a lot of heat, is conducive to reducing the temperature of the system, so the fire effect is significant, the steel has an efficient fire insulation protection. In addition, when this kind of steel structure fire retardant coating is subjected to fire, the volume of the coating does not change to form a glazed protective layer, which can play the role of isolating oxygen, so that oxygen can not be protected by flammable substrate contact, so as to avoid or reduce the combustion reaction. However, the thermal conductivity of the glazed protective layer generated by such coatings is often large, and the thermal insulation effect is poor. In order to obtain a certain fire and heat insulation effect, thick-coated fire retardant coatings are generally thicker in order to achieve certain fire and heat insulation performance requirements.
Fireproof coating spraying construction team. In order to overcome the shortcomings of fire prevention in the practical application of steel structure materials, fire prevention treatment must be carried out, the purpose is to increase the fire resistance limit of steel structure to the limit range specified in the design code. The key is to take different methods according to different situations, such as using insulation and refractory materials to block the flame directly burning the steel structure, reducing the speed of heat transfer to delay the temperature rise of the steel structure and the time of weakening the strength. But whatever the approach, the principle is the same. The following introduces the fire protection measures of several different steel structures. Expansion type thin coating type construction third, shielding. The steel structure is set in the wall or ceiling composed of refractory materials, or the components are hidden in the gap between the two walls, as long as a little refractory material or no increase can achieve the purpose of fire prevention. This is the most economical method of fire prevention. Building fire prevention is an important field of fire science and technology, and fireproof paint is an important part of fireproof building materials. Fireproof coating refers to a type of coating that is painted on the surface of the object to prevent fire, prevent the spread of fire or isolate the fire source, extend the fire time of the substrate or increase the insulation performance to delay the structural damage time. According to the use and use of different objects can be divided into: decorative fireproof coating, cable fireproof coating, steel structure fireproof coating, prestressed concrete floor fireproof coating and so on. The development of China's fireproof coatings, compared with foreign industrial development 15 to 20 years later, although the start is late, but the development speed is faster. In particular, fireproof coatings for steel structures have approached or reached the international advanced level from the perspective of variety type, technical performance, application effect and standardization. In recent years, its demand has increased exponentially, which is inseparable from the rapid development of steel structure buildings. Decorative fireproof coatings are generally used as protective materials for combustible substrates, which have certain decorative and fireproof properties, and are divided into two categories: water-based and solvent-based. The steel structure fire retardant coating is mainly used as a protective material for non-burning body components, this kind of fire retardant coating coating is relatively thick, and the density is small, low thermal conductivity, so it has excellent thermal insulation performance, and is divided into organic fire retardant coating and inorganic fire retardant coating. First, when the coating is not dry and solidified, the bond is not strong or powdered, hollow and falling off. Third, the surface layer should be uniform in color and flat. 3. Check whether the product has a qualified inspection report issued by the fire quality inspection center, and can also be checked online. Fire retardant coatings implement the fire protection product type approval system, and fire retardant coatings sold on the market should have fire protection product type approval certificate and type inspection qualification report. Article 3.3.2 Two-component coating shall be deployed on site according to the instructions; Single-component coatings should also be thoroughly stirred. After spraying, there should be no flowing and falling. Article 3.3.3 The construction of bottom coating shall meet the following requirements:.
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