Characteristics and construction method of silicone coatings-Iota

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Service > Characteristics and construction method of silicone coatings

Characteristics and construction method of silicone coatings

Resistance to high temperature silicone coating can withstand high temperature (100-800 DEG C) oxidation and other corrosive medium, namely in the environment can achieve stable physical properties, does not fall off, blistering, cracking, no powder, no rust, allowing a slight discoloration. With the continuous development of the industrialization of science and technology, users to resistant high temperature coating properties and application conditions put forward higher and higher requirements requires not only paint at high temperature with the excellent heat resistance, corrosion resistance, oil resistance, solvent resistance, but also for the silicone coating can not only curing, room temperature curing, curing, can also through some curing curing accelerator.
Silicone paint
(silicone paint's unique properties in the application of high-grade construction)
Human sentence is known as the paint industry, namely "three coatings, divided into seven construction", the importance of visible coating construction, only through the proper construction method to play a better resistance to high temperature silicone coating. Furthermore, silicone coating quality is the key, the our country better known resistant silicone high-temperature paint brands have "Big Island", "the union" and other high temperature coating resistant.
1 - crosslinking curing method of silicone coatings
Before the construction of high temperature resistant silicone coatings, the composition of silicone resin and the way of crosslinking curing are discussed. Commonly referred to as the silicone resin is a highly crosslinked network structure of polysiloxane is composed of methyl trichlorosilane, dimethyl dichloro silane, phenyl trichloro silicane, diphenyl dichloro silane or methyl phenyl dichloro silane mixtures.
Curable silicone resin is usually achieved through silanol condensation to form silicon oxygen chain. When the condensation reaction was carried out, the concentration of the alcohol concentration decreased gradually, and the flow resistance decreased and the reaction rate decreased. Therefore, it is necessary to heat treatment and add the catalyst to accelerate the reaction. The global silicone network has a great influence on the performance of the methyl group and the phenyl group in the silicone resin. Generally speaking, the lower the phenyl content, the faster the condensation rate, the more soft the film is generated, and the higher the concentration of phenyl, the harder the film is generated. In addition, the introduction of phenyl, can improve the wettability of silicone resin on the pigment, but also improve the compatibility of silicone resin and other resin, as well as the bonding of silicone resin to various substrates.
Silicone resin curing roughly three ways: first, to shrink polymerization crosslinking network structure formed by the hydroxyl silicon atoms, which is the main way of crosslinked silicone resin; second, the use of silicon atoms connected to the vinyl by organic peroxide as a medium for curing, similar to silicon rubber vulcanization; the third using silicon atoms connected vinyl and silicon hydrogen bond addition reaction. Based on the above considerations, a reasonable construction scheme of silicone coatings is formulated.
2 - silicone paint before the construction of the first treatment
Silicone coatings are generally used in the construction of metal components, first of all, to carry out the metal components, the first process is as follows:
(1) first remove the welding slag, burr, oil and other impurities produced during the processing of the metal components.
(2) for the treatment of the fat, to improve the surface of the workpiece and reduce the cleanliness of the oil pollution.
(3) for sand blasting. Sandblasting the compressed air must be free of oil and anhydrous, compressed air pump should be equipped with oil and water separator, use should be filtered to compressed air, and the daily timing of oil-water separator, air compressor discharge to ensure compressed air dry cleaning, abrasive jet should be dry, clean. Under normal circumstances, the metal surface rust grades should be carried out in accordance with the coating of steel surface rust grades and derusting grade "relevant provisions of. (4) after sand blasting, oxidation layer on the surface of metal member, rust and dirt should be completely removed, and dry compressed air or a clean brush. Remove the surface dust and residual impurities.
(5) in order to achieve good coating effect, Shotblast sandblasting requires large amounts of clean solvent cleaning workpiece, the related tools, instruments must also clean and not greasy.
(6) after the processing of the workpiece can not use hand to touch, allowing the workpiece to store the longest time no more than 2h, if placed too long, the workpiece surface will rust and affect the film quality.
(7) if the process is used in the process of pickling and phosphating, it should cancel the phosphating process when the workpiece is used for more than 350, because it will be destroyed by more than 350.
(8) at the end of the final, the shorter the coating interval shall be as soon as possible. Before painting, such as the discovery of pollution or rust, should be re treated to the derusting grade standard.

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