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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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.
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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 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.
Third, when spraying, ensure that the coating is completely closed and the outline is clear. Fireproof paint construction scheme,
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.
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.
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.
Third, when the coating surface has floating slurry or crack width greater than 1.0mm
Second, the joint of the steel structure, the coating at the corner has obvious depression. , fireproof paint construction price Fireproof paint construction method:
Article 3.4.4 During the construction process, the operator shall use a thickness measuring needle to test the thickness of the coating until it meets the thickness specified in the design.
First, when the coating is not dry and solidified, the bond is not strong or powdered, hollow and falling off.
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.
The fire prevention principle of fireproof coatings can be roughly summarized as the following five points:
Article 3.3.3 The construction of bottom coating shall meet the following requirements:
2. When the qualified fireproof coating is burned by strong fire such as blowtorch, a large amount of foam will expand, the surface will gather and bulge, and there will be no burning damage within a few minutes, while the fake and shoddy fireproof coating is basically not foaming, there will be a large number of scattered slag, and the wood substrate will soon be burned and damaged.
(3) The fire retardant coating is decomposed by heat into non-flammable inert gas, diluting the flammable gas that is decomposed by heat of the protected object, so that it is not easy to burn or slow down the combustion rate.
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.
Fourth, expansion material. The use of steel structure fire retardant coating to protect the components, this method has good fire insulation performance, the construction is not limited by the steel structure geometry and other advantages, generally do not need to add auxiliary facilities, and the coating weight is light, there is a certain aesthetic decorative role, belongs to the modern advanced fire protection technical measures. , fire resistance
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.
(2) Fireproof coating has low thermal conductivity, delaying the conduction rate of high temperature to the substrate;
Article 3.3.4 Surface coating construction shall meet the following requirements:
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. Fire retardant paint construction team
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.
Ultra-thin or thin
Expansive thin coating construction
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.
Thick-coated steel structure fireproof paint
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. 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.
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.
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.
Evaluation quality
(4) The nitrogenous fireproof coating is heated to decompose NO, NH3 and other groups, and combine with organic free groups to interrupt the chain reaction and reduce the temperature.
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 package acceptance. 5, when the design requires the coating surface to be smooth, the last coating should be smoothed to ensure that the outer surface is uniform and smooth. Fireproof paint construction environment 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. 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 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. 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/㎡. 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 lower 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. 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. 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. Third, the surface layer should be uniform in color and flat. 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. 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. (4) When the coating thickness is less than 85% of the thickness specified in the design, or when the coating thickness is greater than 85% of the thickness specified in the design, but the length of the continuous area of the coating that does not reach the specified thickness exceeds 1m. (1) The fireproof coating itself cannot be burned, so that the protected substrate is not directly in contact with oxygen in the air; Building fire prevention is an important field of fire science and technology, and fire retardant coating is an important part of fire resistant 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. 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 and anti-rust treatment meet the requirements, dust and other debris can be cleaned before construction. 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. Brush coating method: Brush coating method is suitable for painting any shape of objects, the vast majority of fireproof coatings can be constructed in this way. The brush coating method can easily penetrate into the fine holes on the metal surface, thus strengthening the adhesion to the metal surface. The disadvantage is that the production efficiency is low, the labor intensity is high, and sometimes the coating surface has brush marks, which affects the decoration of the coating.
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