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Service > Silicone coating properties and construction methods

Silicone coating properties and construction methods

High temperature silicone coatings can withstand high temperatures (100 ~ 800 ℃) oxidation and other corrosion, namely in that environment to achieve stable physical properties, not falling, no blistering, no cracking, no powder, no rust, allowing a slight discoloration. With the development of industrialization and science and technology, user performance and construction conditions of high temperature coatings to the growing demand, not only requires coating with excellent heat resistance at high temperatures, corrosion resistance, oil resistance, solvent, etc., but also for silicone coatings can not bake curing, room temperature curing, crosslinking, or by some of the curing accelerator curing.

Silicone Coating
(Unique properties of silicone coatings used in high-end buildings)

Paint industry well known saying, then, that is, shows the importance of the paint production "Three paint, construction of seven" and only through the appropriate construction methods to be able to give better play to the role of high-temperature silicone coatings. Furthermore, silicone coatings their quality is also critical of the more well-known high-temperature silicone coatings brands are "Big Island", "Union" and other high-temperature coatings.
1. crosslinked silicone coating curing method
Before talking about the construction of high temperature silicone coating, to talk about the composition of the silicone resin and crosslinking manner. Commonly referred to as silicone resins are highly cross-linked network structure of the polyorganosiloxane is methyl trichlorosilane, dimethyl dichlorosilane, phenyl trichlorosilane, diphenyl dichlorosilane or consisting of a mixture of methyl phenyl dichlorosilane.
Curable silicone resin is generally formed by condensation of silanol siloxane chain links to achieve. When the condensation reaction, due to the concentration of silanol gradually reduced, increasing the steric hindrance, fluidity, so that the reaction rate decreases. Therefore, if the silicone resin is fully cured, the heat treatment must be carried out, and the addition of a catalyst to accelerate the reaction. Global silicone network learned, the proportion of silicone resin in methyl phenyl functional groups and functional groups also have a significant impact on its performance. Generally, the lower the phenyl content, the faster the rate of condensation, the softer the resulting film; the higher the phenyl content, the harder the resulting film. In addition, the introduction of a phenyl group, a silicone resin to improve the pigment wetting, silicone resin also improves compatibility with other resins, and silicone resins for adhesive force to various substrates.
Crosslinking silicone resins are basically three ways: first, the use of a hydroxyl group on the silicon atom shrink crosslinking polymerization to form a network structure, which is a silicone resin crosslinking of the main ways; second, the use of silicon atoms connecting vinyl, organic peroxide as the medium for curing silicone rubber vulcanization similar way; and third, the use of vinyl and silicon-hydrogen bonds on the silicon atom of conduct of an addition reaction. Based on the above considerations, the development of rational silicone coatings construction program.
2. Silicone Coating pretreatment construction
Silicone coatings are generally applied over a metal member, the first member of the metal pre-treatment, pre-treatment process as follows:
(1) First remove metal component in the process produced welding slag, burrs, oil and other impurities.
(2) degreased to improve the cleanliness of the workpiece surface and to reduce oil pollution sand pill.
(3) sand-blasting. Blasting compressed air used must be free of oil and water, compressed air pumps should be equipped with water separator, compressed air filter should be used, and the timing of the daily water separator, air compressor drain to ensure clean and dry compressed air jet The abrasive should be dry and clean. In general, the metal surface rust grade should follow "the steel surface before painting Rust grades and preparation grades" to implement the relevant provisions. (4) After sandblasting, the oxide layer, rust and dirt surface of the metal member to be completely removed, and dried with compressed air or a clean brush to remove surface dirt and residual impurities.
(5) In order to achieve better coating effect, after the sand blasting requires large amounts of cleaning solvents to clean parts, tools used, the appliance must be clean and free of grease.
(6) of the workpiece after the treatment can not touch, allowing the workpiece stored maximum time of no more than 2h, if left too long, the surface will rust and affect the film quality.
(7) If you use acid phosphate treatment process, the workpiece ambient temperature than 350 ℃ and time, it should be abolished phosphate process, because than 350 ℃ and phosphate coating will be destroyed.
(8) Finally, as soon as possible should paint, coating interval as short as possible. Before painting, such as found in contaminated or return to rust, the rust should be re-processed to achieve grade standards.
3. Construction of silicone coatings
Before the silicone coating application, from the ingredients begin, in accordance with the requirements of manufacturers, construction environment, the workpiece, with a special matching paint thinner adjust viscosity. Roughly the amount of diluent: airless spray, from about 5% to 10% (by coating mass, the same below); air spray, from about 15% to 30%; brush, about 10% to 20%. Different manufacturers, different paint products, amount of thinner is also different; when Furthermore construction should be based on experience, always detect coating thickness, thickness does not reach the requirements, should be promptly painted up; before the film is dry or the next Before spraying, coating should protect, prevent contamination or damage; after spraying, the coating surface should be no flow marks, seamless spray phenomenon, uniform film thickness, the same color, not a rough, sagging, cracks, blistering, peeling, and other defects.
Under normal circumstances, the silicone coatings are applied by spray, spraying should pay attention to the following points:
(1) coating application are required to comply with the temperature and humidity conditions, silicone coatings is no exception. Best environmental temperature silicone coatings construction of 5 ~ 40 ℃, humidity of 25% to 85%.
(2) to pay attention to the installation of an air compressor and water separator, and the timing of the oil-water separator every day, drain the air compressor, it is very important.
(3) before painting, painting unwanted parts, such as the wedge grooves, shaft hole, finished surface and some special parts of the shelter.
(4) before painting, strict inspection coating equipment is clean and dry, if pollution must be processed to meet the corresponding requirements before coating.
(5) paint, do not use gasoline and water, it is best to use paint thinner adjust viscosity.
(6) Spray tools after you finish using it should be cleaned and kept clean, dry, until the next use.
(7) the paint surface to avoid human trampling and handling of mechanical damage.
(8) maximize the use of environment-friendly high solids silicone coatings, especially the brand paint manufacturers paint varieties.
(9) According cured silicone coatings drying conditions required to guarantee the quality of the film.
4. Conclusion
This article only high temperature silicone coatings of conventional construction general introduction, in some aspects of high-temperature construction special jobs, there are a lot of changes and uncertainties, the need to respond flexibly according to objective conditions and the environment. Through the introduction, hoping to enhance the awareness of relevant personnel silicone coatings construction, give full play to the excellent performance of silicone coatings play a reference to be able to better promote the use of high-temperature silicone coatings

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