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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Fireproof paint construction environment
Non-expansive thick-coated construction
4. In actual use, in order to ensure the fire prevention and other performance of fire retardant coatings, it is generally necessary to use transparent finish coatings. The amount of fire retardant coating is generally 350 ~ 500 grams/square meter, and the amount of coating is generally 50 grams/square meter.
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.
Third, when spraying, ensure that the coating is completely closed and the outline is clear.
Super thin or thin fire retardant coating project general contracting,
The fireproof coating of steel structure with a coating thickness of 3 ~ 7mm is called the thin-coated steel structure fireproof coating. This kind of coating can expand and foam when subjected to fire, and the refractory insulation layer formed by the expansion of foam delays the temperature rise of the steel and protects the steel member. This kind of steel structure coating is generally made of suitable latex polymer as the base material, and then composed of flame retardants, additives, etc. For this type of fireproof coating, the emulsion polymer required to be selected must have good adhesion, durability and water resistance to the steel substrate. The emulsion polymers commonly used as the base material of this kind of fire retardant coatings are styrene modified acrylic emulsion, polyvinyl acetate emulsion, vinylidene chloride emulsion, etc. For the fireproof coating with water-based emulsion as the base material, flame retardant additives, pigments and fillers are dispersed to water, so water actually plays the role of dispersion carrier, in order to make various granular additives can be better dispersed, but also add dispersants, such as commonly used sodium hexametaphosphate. This kind of steel structure fire retardant coating in the production process is generally divided into three steps: first, the various flame retardant additives are dispersed in water, and then ground into the specified fineness of the slurry; The second step is to use the base material (emulsion) to match the paint; The third step in the slurry with inorganic lightweight materials, reinforcing materials, etc. Stir evenly. The coating is generally divided into the bottom layer (heat insulation layer) and the surface layer (decorative layer), its decoration is better than the thick coating type, the construction is sprayed, and it is generally used in the building steel structure with fire resistance limit requirements of no more than 2h.
Roller coating method: the roller is a hollow cylinder with a small diameter, the surface is sticky with long wool made of synthetic fiber, the cylinder is equipped with two washers at both ends, the center has a hole, and the curved handle is passed through this hole, and the roller is soaked in the paint when used, and then the roller is applied to the required surface. A roller coating device for conveying paint by air compressor is developed.
Thick steel structure, fire retardant coating construction price ultra-thin steel structure fire retardant coating
Evaluation quality
Thick-coated steel structure fireproof coating refers to the coating thickness of 8 ~ 45mm, the fire resistance limit of this type of fireproof coating can reach 0.5 ~ 3h. The coating does not expand in the fire, relying on the non-flammability of the material, low thermal conductivity or the heat absorption of the material in the coating, delaying the heating of the steel and protecting the steel. This kind of steel structure fire retardant coating uses a suitable binder, and then with inorganic lightweight materials, reinforcing materials. Compared with other types of steel structure fire retardant coatings, in addition to some advantages of water-soluble fire retardant coatings, because it is from the base material to most additives are inorganic, so the cost is low. The construction of this kind of steel structure fireproof coating is generally sprayed, and it is mainly used in indoor steel structures with fire resistance limit requirements of more than 2h. However, due to the thick coating, the appearance of such products is relatively poor.
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/㎡.
Thick-coated steel structure fireproof coating refers to the coating thickness of 8 ~ 45mm, the fire resistance limit of this type of fireproof coating can reach 0.5 ~ 3h. The coating does not expand in the fire, relying on the non-flammability of the material, low thermal conductivity or the heat absorption of the material in the coating, delaying the heating of the steel and protecting the steel. This kind of steel structure fire retardant coating uses a suitable binder, and then with inorganic lightweight materials, reinforcing materials. Compared with other types of steel structure fire retardant coatings, in addition to some advantages of water-soluble fire retardant coatings, because it is from the base material to most additives are inorganic, so the cost is low. The construction of this kind of steel structure fireproof coating is generally sprayed, and it is mainly used in indoor steel structures with fire resistance limit requirements of more than 2h. However, due to the thick coating, the appearance of such products is relatively poor.
Article 3.4.3 Spraying construction should be completed by each spraying thickness should be 5~10mm, must be basically dried or cured in the previous time, and then sprayed again. The spraying protection mode, the number of spraying passes and the coating thickness should be determined according to the construction design requirements.
Third, when the coating surface has floating slurry or crack width greater than 1.0mm
Fire resistance
The fire prevention principle of fireproof coatings can be roughly summarized as the following five points: The fire insulation principle of the thick steel structure fire retardant coating coated 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, the coating of the fire retardant coating itself is non-combustible, which acts as a barrier to the steel member and prevents thermal radiation, 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 achieve a certain fire and heat insulation effect, thick-coated fire retardant coatings generally have thicker coatings to achieve certain fire and heat insulation performance requirements.
(1) The fireproof coating itself cannot be burned, so that the protected substrate is not directly in contact with oxygen in the air;
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. Fireproof coating engineering construction
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.
Fireproof paint is by brushing the paint on the surface of the material, can improve the fire resistance of the material, slow the spread of the flame, or in a certain period of time can prevent combustion, this type of paint is called fireproof paint, or called flame retardant paint.
First, when the coating is not dry and solidified, the bond is not strong or powdered, hollow and falling off. As a form of high-rise building structure, steel structure is widely used in the construction industry with 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.
Article 3.4.6 When the fireproof coating appears in one of the following circumstances, it shall be re-sprayed:
(4) The nitrogenous fireproof coating is decomposed by heat into NO, NH3 and other groups, which are combined with organic free groups to interrupt the chain reaction and reduce the temperature.
Fire retardant coating construction method. (5) The expansive fireproof coating expands with heat to form a carbon foam insulation layer to seal the protected object, delay the transfer of heat and the substrate, and prevent the object from burning or the strength of the decrease caused by the increase in temperature. 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. There are many kinds of fireproof coatings, but according to the object of use of fireproof coatings and the coating thickness of fireproof coatings, it is generally divided into decorative coatings and steel structure fireproof coatings. In case of fire, 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 expands and foams when subjected to fire, forming a dense fire insulation layer, which 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. Article 3.3.3 The construction of the bottom coating shall meet the following requirements: The fireproof coating of steel structure with a coating thickness of 3 ~ 7mm is called the fireproof coating of thin-coated steel structure. This kind of coating can expand and foam when subjected to fire, and the refractory insulation layer formed by the expansion of foam delays the temperature rise of the steel and protects the steel member. This kind of steel structure coating is generally made of suitable latex polymer as the base material, and then composed of flame retardants, additives, etc. For this type of fireproof coating, the emulsion polymer required to be selected must have good adhesion, durability and water resistance to the steel substrate. The emulsion polymers commonly used as the base material of this kind of fire retardant coatings are styrene modified acrylic emulsion, polyvinyl acetate emulsion, vinylidene chloride emulsion, etc. For the fireproof coating with water-based emulsion as the base material, flame retardant additives, pigments and fillers are dispersed to water, so water actually plays the role of dispersion carrier, in order to make various granular additives can be better dispersed, but also add dispersants, such as commonly used sodium hexametaphosphate. This kind of steel structure fire retardant coating in the production process is generally divided into three steps: first, the various flame retardant additives are dispersed in water, and then ground into the specified fineness of the slurry; The second step is to use the base material (emulsion) to match the paint; The third step in the slurry with inorganic lightweight materials, reinforcing materials, etc. Stir evenly. The coating is generally divided into the bottom layer (heat insulation layer) and the surface layer (decorative layer), its decoration is better than the thick coating type, the construction is sprayed, and it is generally used in the building steel structure with fire resistance limit requirements of no more than 2h. 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. General contract construction of fire prevention and anticorrosion engineering, thick steel structure fire retardant coating construction environment fire resistance Article 3.4.5 After spraying, the coating should be removed mastoid to ensure uniform and smooth.
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