Anticorrosion principle of high temperature resistant coating
High temperature resistant paint, as the name implies, is to withstand high temperature oxidation and other media corrosion paint, divided into organic silicon high temperature resistant paint and inorganic silicon high temperature resistant paint series.At present, the more used in industry is silicone high temperature resistant coating.
The properties of high temperature resistant coatings are closely related to film forming resins.The heat resistance of silicone resins is much higher than that of other types of resins. Therefore, the resin is the main component in the production of high temperature resistant coatings.
So how to protect the substrate in a high temperature environment?
Anticorrosion principle of high temperature resistant coating:
In addition to containing resin, solvents, additives, fillers, etc., high temperature resistant coatings also have glass powder or aluminum powder, which is the key raw materials of high temperature protection.Under 600 ℃ environment by organic silicon resin as a protective film, to anti-corrosion of base material, as temperatures continue to rise, more than 400 ℃, organic silicon resin has not up to a higher temperature, is unable to provide corrosion protection, so at this point, the glass powder or aluminium reached the melt temperature, instead of the original organic silicon resin, gradually formed a new protective film,Can withstand higher temperature, prevent corrosion of steel oxidation.
High temperature resistant coating is formed by biochemical crosslinking reaction under high temperature environment to form three-dimensional network structure film, the crosslinking reaction is realized by automatic oxidation of unsaturated groups in the resin condensation polymerization reaction.In the film forming process, the dispersing medium volatilizes at the same time the polymer particles are extruded and deformed together, and then the agglomeration of particles becomes the agglomeration of molecules and forms a continuous coating to achieve the anti-corrosion effect.
