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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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.
Third, the surface layer should be uniform in color and flat.
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.
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 contract price,
(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.
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.
In addition to steel structure fire retardant coatings, decorative fire retardant coatings, cable fire retardant coatings, etc., have also developed rapidly. The decorative fireproof coating is a new type of coating which integrates decoration and fireproof. When it is coated on the combustible substrate, it can play a certain decorative role at ordinary times. Once the fire occurs, it prevents the spread of the fire, so as to achieve the purpose of protecting the combustible substrate. It is precisely because of this special use of it, so foreign industrial development as early as the 1920s there was a fireproof coating. The development of this paint went through two stages. The initial appearance of silicate water glass as a binder inorganic fireproof coating, such fireproof coating itself does not burn, when the fire can form a hollow core bubble layer, the flammable substrate has a certain protective effect, the disadvantage is that the heat insulation performance and weather resistance is poor, easy to produce white, crack and fall off. In the late 40's, people began to develop organic expansive fireproof coating, the main feature of this coating is that the fire resistance and physical and chemical properties are better than inorganic fireproof coating, coating can form a dense spongy expanded foam layer with good thermal insulation properties when it meets fire, can more effectively protect the combustible substrate.
(2) Fireproof coating has low thermal conductivity, delaying the conduction rate of high temperature to the substrate; When the bottom thickness meets the design requirements and is basically dry, the surface layer can be constructed.
Second, the bottom is generally sprayed 2 to 3 times, each time the spray thickness should not exceed 2.5mm, must be in the previous drying, and then spray again.
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.
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.
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 fire retardant coating on the building components can only play the role of fire resistance and heat insulation after the solvent has evaporated.
Since the fire retardant coating is used to block the spread of the fire, then what kind of fire retardant coating quality is good? What are the criteria? Domestic fireproof coatings are divided into one, two, three levels, of course, is a better performance. The quality of fire retardant coatings is mainly determined by the fire resistance and physical and chemical properties of fire retardant coatings. Fire performance includes four indicators, such as flame resistance time, flame propagation ratio, weight loss and carbonization volume, which can be obtained by large plate combustion method, tunnel combustion method and small chamber combustion method according to the standard. The physical and chemical properties mainly include solid content, viscosity, flexibility, impact strength, adhesion, drying time and water resistance. The technical index is obtained according to the standard test.
Article 3.4.5 The coating after spraying shall be removed from the mastoid process to ensure uniformity and smoothness.
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 3.3.1 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.
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. 3. Check whether the product has a qualified inspection report issued by the fire quality Inspection center, and you can also check the Internet. 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 3.3.4 Surface coating construction shall meet the following requirements:
(1) The fireproof coating itself cannot be burned, so that the protected substrate is not directly in contact with oxygen in the air;
Fireproof coating construction method:
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. Fireproof paint package price
Expansive thin coating construction
Scraping method: The use of metal or non-metal scraper, such as hard rubber sheet, glass steel scraper, horn scraper and other manual scraping, used to scrape a variety of thick paste type fire retardant paint and putty.
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.
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.
When the surface of the coating has floating slurry or the crack width is greater than 1.0mm, the fire prevention principle of the fireproof coating can be roughly summarized as the following five points:
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.
Thick-coated steel structure fireproof paint
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.
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 (insulation layer) and the surface layer (decorative layer), its decoration is better than the thick coating type, the construction is sprayed, generally used in the fire resistance limit requirements of no more than 2h on the building steel structure.
Fire retardant coating construction method. Article 3.4.4 During the construction process of thick steel structure, the operator shall use a thickness measuring needle to detect the thickness of the coating until it meets the thickness specified in the design. Third, when spraying should ensure that the coating is completely closed, the outline is clear. Is the thicker the coating of the fireproof coating, the better its fire resistance? In general, for non-expansive fireproof coatings, it is dependent on its own flame resistance and incombustible to prevent the spread of flame. Therefore, the thicker the coating, the thicker the glaze formed at high temperature, and the insulation effect of the fireproof coating will also be improved. For the expansive fireproof coating, the thickness of the coating, the expansion of foam by fire, the formation of the foam layer of isolation of oxygen and heat insulation is thicker, and at the same time, the [NO], [NH3] and other groups of some nitrogenous fireproof coatings are decomposed, and the combination with organic free groups is good for interrupting the chain reaction. Therefore, from the point of view of improving fire resistance, the thicker the coating, the better. First, when the steel substrate surface rust removal and rust prevention treatment meet the requirements, dust and other debris can be cleaned before construction. The fire insulation principle of the ultra-thin or thin steel structure fire retardant coating coated on the steel structure is that the fire retardant coating layer expands and foams when subjected to fire, forming a foam. The foam layer not only insulates oxygen, but also has good heat insulation performance because of its loose texture, which can delay the speed of heat transfer to the protected substrate; According to the analysis of physical and chemical principles, the process of the foam layer generated by the expansion of the coating due to the expansion of the volume and endothermic reaction, but also consumes the heat during combustion, which is conducive to reducing the temperature of the system, the role of these aspects, so that the fireproof coating has a significant fire insulation effect. Second, filled with water (water jacket), hollow steel structure filled with water 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. 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. 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. 3.4.2 When batching, the material or diluent should be added strictly according to the mix ratio, and the consistency is suitable, and the side is used. Article 3.3.3 The construction of the bottom coating shall meet the following requirements: ultra-thin steel structure fireproof coating refers to the coating thickness of no more than 3mm steel structure fireproof coating, this type of fireproof coating expands and foams when subjected to fire, forming a dense fireproof 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 3.4.1 Thick-coated steel structure fireproof coating should be sprayed by a pressure feed sprayer, the air pressure is 0.4~0.6Mpa, and the diameter of the spray gun mouth should be 6~10mm. 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. When qualified fireproof coatings are burned by strong fire such as blowtorch, a large amount of foaming expansion will occur, the surface will gather and bulge, and there will be no burning damage within a few minutes, while fake and shoddy fireproof coatings are basically not foaming, there will be a large number of scattered slag, and the wood substrate will soon be burned and damaged. Ultra-thin or thin fire retardant coatings are composed of coating components such as base material (i.e. film-forming substance), pigment, common coating additives, fire retardant additives and dispersion media. 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. 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 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. (4) Nitrogenous fireproof coatings decompose NO, NH3 and other groups by heat, and combine with organic free groups to interrupt the chain reaction and reduce the temperature.
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