Coating technology: Construction Technology of high temperature resistant silicone coating

Core tip: high temperature resistant silicone coating refers to a kind of coating that can withstand high temperature (100-800 ℃) oxidation and other medium corrosion, that is to say, it can achieve physical performance stability in the above environment, without falling off, foaming, cracking, pulverization and rust, and slight color change is allowed At present, with the continuous development of industrialization and science and technology, users have put forward higher and higher requirements for the performance and construction conditions of high-temperature resistant coatings, which not only require that the coatings have excellent heat resistance, corrosion resistance, oil resistance, solvent resistance, etc at high temperature, but also require that organic silicon coatings can not only bake and solidify Paint knowledge | precautions for wall paint color selection Recommended introduction: when painting the wall, the owner sometimes has difficulty in choosing what color of the wall paint to paint In fact, there is no ugly color in the wall paint, only the disharmonious color matching The use of wall color contains the knowledge of health Too strong color will stimulate people's perception, make people have a sense of fidgety, affect people's mental health Grasp the basic principles of wall color and paint a colorful space 1、 Wall paint color selection notice 1 Light color is generally used for the top surface Light colors make people feel light, dark colors make people feel heavy Usually, the treatment of rooms is from top to bottom, from shallow to deep For example, the ceiling and walls of rooms are white and Coating home news: high temperature resistant silicone coating refers to a kind of coating that can withstand high temperature (100-800 ℃) oxidation and other medium corrosion, that is to say, it can achieve physical stability in the above environment, not fall off, not bubble, not crack, not powder, not rust, and it is allowed to have slight color change At present, with the continuous development of industrialization and science and technology, users have put forward higher and higher requirements for the performance and construction conditions of high-temperature resistant coatings, which not only require that the coatings have excellent heat resistance, corrosion resistance, oil resistance, solvent resistance, etc at high temperature, but also require that organic silicon coatings not only can be cured by baking, curing at room temperature, cross-linking, and also can be cured by some means Curing accelerator curing This paper introduces the specific construction technology of high temperature resistant silicone coating, and expounds in detail from two aspects before and after construction Before the construction of organosilicon coating, 1 Remove the welding slag, burr, oil stain and other impurities produced in the processing of metal components 2 Degreasing treatment is carried out to improve the cleanness of the workpiece surface and reduce the oil pollution of the sand shot 3 Sand blasting The compressed air used for sandblasting must be free of oil and water The compressed air pump shall be equipped with an oil-water separator When using, the compressed air shall be filtered, and the water of the oil-water separator and air compressor shall be drained regularly every day to ensure that the compressed air is dry and clean The abrasive sprayed shall be dry and clean Generally, the derusting grade of metal surface shall be in accordance with the relevant provisions of rust grade and derusting grade of steel surface before coating 4 After sandblasting, the oxide layer, rust and dirt on the surface of metal components shall be completely removed, and dry compressed air or clean wool shall be used 5 in order to achieve better coating effect, a large number of cleaning solvents shall be used to clean the workpiece after sandblasting and shot blasting, and the relevant tools and instruments shall be clean and free of oil stain 6 the treated workpiece cannot be touched by hand, and the maximum time allowed for the workpiece to be stored is not more than 2 h if it is placed too long, the surface of the workpiece will rust and affect the quality of the paint film If the pickling and phosphating process is selected, the phosphating process should be cancelled when the working environment temperature exceeds 350 ℃, because the phosphating film will be damaged when the temperature exceeds 350 ℃ 8 finally, coating shall be carried out as soon as possible, and the shorter the coating interval, the better Before coating, if pollution or rust return is found, it shall be treated again to reach the rust removal level standard Before the construction of organosilicon coating, the viscosity of the coating shall be adjusted with the special diluent according to the requirements of the manufacturer, the construction environment and the workpiece, starting from the ingredients Approximate dosage of diluent: airless spraying, about 5% - 10% (based on coating quality, the same below); air spraying, about 15% - 30%; brush coating, about 10% - 20% Different manufacturers, different coating products and diluent dosage are also different In addition, during construction, the thickness of coating shall be tested at any time according to experience If the thickness does not meet the specified requirements, the coating shall be repaired in time Before drying or before the next spraying, the film shall be protected to prevent contamination or damage; after spraying, the surface of the film shall be free of flow marks and leakage, the thickness of the film shall be uniform, the color shall be consistent, and there shall be no rough, sagging, cracks, blistering, peeling and other defects Under normal circumstances, silicone coating is applied by spraying construction, and the following points shall be paid attention to during spraying construction: 1 Any coating construction shall meet the specified temperature and humidity conditions, and silicone coating is no exception The best environment temperature for silicone coating construction is 5-40 ℃, and the environment humidity is 25% - 85% 2 Pay attention to the installation of oil-water separator for air compressor, and regularly discharge water to oil-water separator and air compressor every day, which is very important 3 before coating, cover the parts that do not need coating, such as wedge groove, shaft hole, finishing surface and some special parts 4 before coating, strictly check whether the coating equipment is clean and dry If there is pollution, it must be treated to make it meet the corresponding requirements before coating 5 when mixing paint, it is forbidden to use gasoline and water It is better to use special diluent to adjust the viscosity of paint 6 After the spraying tools are used, they should be cleaned in time, kept clean and dry, and used next time 7 The surface of the paint film shall be protected from artificial trampling and mechanical damage during transportation 8 Try to use environment-friendly high solid silicone coating, especially the coating varieties of brand coating manufacturers 9 Cure according to the drying conditions required by the silicone coating products to ensure the film quality 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,