Common knowledge of coating: precautions for use of fireproof coating and anticorrosive coating

Core tip: with the rapid development of China's capital construction, there are more and more buildings with steel structure materials as load-bearing components Steel structure not only has the advantages of light weight, high strength, good seismic performance, but also has the characteristics of beautiful shape, convenient construction, short construction period and so on Therefore, it is more and more widely used in the field of large-span and high-rise buildings However, compared with reinforced concrete building structure, steel structure building has some disadvantages, which are mainly shown as follows: It is easy to be affected by the environment, especially in some large chemical enterprises that are prone to electrochemical corrosion of steel structures Shenyang steel structure fireproof coating construction expert punde Building Fire Engineering Co., Ltd Recommended introduction: since its establishment, Shenyang punde Construction Fire Engineering Co., Ltd has cultivated a group of professional construction teams with excellent equipment, rich experience and serious responsibility with advanced and scientific management methods and strict engineering quality assurance and after-sales service system It has undertaken a number of fire system installation projects, which has been praised by customers Every idea and special requirement of you will be fully considered by us and fully realized in the construction technology, which will become the cornerstone of our successful long-term development We are looking forward to your invitation, to provide you with quality services and high-quality technical support! All construction coatings have passed ISO9001 Paint Home News: with the rapid development of China's capital construction, there are more and more buildings with steel structure materials as load-bearing components Steel structure not only has the advantages of light weight, high strength, good seismic performance, but also has the characteristics of beautiful shape, convenient construction, short construction period and so on Therefore, it is more and more widely used in the field of large-span and high-rise buildings However, compared with reinforced concrete building structure, steel structure building has some disadvantages, which are mainly shown as follows: It is easy to be affected by the environment, especially in the steel structure workshop of some large chemical enterprises which are prone to electrochemical corrosion of steel structure, the service life is shortened; in addition, the fire prevention capacity is low, which leads to the rapid decline of structural strength in case of fire, resulting in the collapse accident of structural damage Therefore, the anti-corrosion and fire protection design and construction of steel structure is particularly important In the case of steel structure anti-corrosion and fire protection, the normal sequence is: derusting, anti-corrosion primer, anti-corrosion intermediate paint and fire-resistant finish When there is fire-proof coating, in theory, it is not necessary to apply rust proof intermediate paint and finish paint, but only after applying rust proof primer Considering that the surface of the fire retardant coating is not smooth enough, if there are certain decoration requirements, the fire retardant coating can be applied between the intermediate paint and the top coat or between the primer and the intermediate paint There should be no chemical reaction between the fireproof coating and the anti rust coating Therefore, the combination of anticorrosive coating and fireproof coating should be paid attention to Precautions for the use of anticorrosive coating and fireproof coating 1 The surface treatment of steel structure surface shall be sand blasted and derusted, with the derusting grade no less than Sa2.5 The derusting quality shall meet the relevant requirements of rust grade and derusting grade of steel surface before coating, and the surface roughness shall reach 40-701llm 2 Combination Due to the special curing mechanism of water-based inorganic zinc rich primer and large surface porosity, which greatly affects the combination performance with fire-retardant coating, the water-based inorganic zinc rich primer should not be used on steel structures with fire protection requirements as far as possible, because its anti-corrosion performance is similar to that of epoxy zinc rich primer, but its construction performance is not as good as that of epoxy zinc rich primer, if it is necessary to use water-based inorganic zinc rich primer For zinc rich primer, it is necessary to add an additional epoxy sealer to increase the adhesion, and then construct the fire retardant coating Due to the application of fluorocarbon finish on the surface of intumescent fire retardant coating in some domestic steel structure projects, serious "paint biting" occurs on the surface, which indicates that the special raw material composition of fluorocarbon finish has an incompatible chemical reaction with the raw material composition of intumescent fire retardant coating The polysiloxane finish has superior performance of fluorocarbon coatings for high light protection, high color retention and aging resistance, and is compatible with many expansive fire retardant coatings The compatibility of fireproof coating and anticorrosive coating means that there should be no chemical reaction between fireproof coating and each layer of antirust coating If the antirust coating is not matched with the fireproof coating, it will directly affect the fireproof performance of the fireproof coating If there are certain decoration requirements, fireproof coating can be applied between intermediate paint and finish paint or between primer and intermediate paint The compatibility shall take into account the coating in contact with it, such as the normal situation: zinc rich primer + epoxy micaceous iron + fire retardant coating + top coat, then the compatibility test with the fire retardant coating shall be: micaceous iron intermediate coating + fire retardant coating; fire retardant coating + top coat, which must be done; a comprehensive coating matching test shall be conducted, and the main index is the adhesion test of the comprehensive coating 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,