Improving the operational and anticorrosive properties of the film-forming base of primers for fire-retardant coatings

The composition and structure of flame-retardant coatings do not provide the required adhesive and protective anticorrosive properties, and therefore it is necessary to use special primers to eliminate these shortcomings. According to the purpose, the primers used for these purposes should have a sufficiently high temperature resistance. The highest resistance to high temperatures, of which polyorganosiloxane oligomers have found application in the field of paint coatings, characterizes Organosilicon polymers. However, coatings based on them, formed without thermal stimulation, are characterized by fragility, unsatisfactory adhesive and barrier properties and, as a result, low anticorrosive efficiency. In order to ensure the chemical structuring of polyorganosiloxane oligomers during the formation of coatings without exposure to elevated temperatures, functional additives were synthesized, which are products of the addition of 3-aminopropyltriethoxysilane to polyesters with terminal epoxy groups of various functionality and structure. The effect of the obtained adducts on the anticorrosive properties and operational characteristics of polyorganosiloxane coatings investigated. The data obtained as a result of the study made it possible to conclude that the branched structure of the hardener contributes to the improvement of the anticorrosive and other operational properties of polyorganosiloxane coatings, and an increase in the distance between the crosslinking nodes increases the level of their chemical structuring. The analysis of the obtained data made it possible to choose the optimal composition and content of the functional additive ensuring the achievement of maximum anticorrosive effectiveness of coatings in combination with high adhesive and physico-mechanical properties without a noticeable loss of their heat resistance.

1. Khananashvili, L. M. (1998). Chemistry and technology of organoelement monomers and polymers. Moscow: Chemistry.

2. Elgar, E., Yilgor, I. (2014). Silicon-containing copolymers: synthesis, properties and application. Polym. Sciences, 39, 1165-1195.

3. Chuppina, S. V., Zhabrev, V. A. (2016). Organosilicate materials. St. Petersburg : Liteo Publishing House.

4. Lorenz, G., Kandelbauer, A. (2014). Silicones, Handbook of Thermosetting Plastics (3rd ed.). Publisher: Raytheon Systems Company.

5. Ding, L. I. U., Yang, Y. U., Le, M. I., Yun, Y. U., & Li-Xin, S. O. N. G. (2018). Preparation of room temperature curable organic-inorganic hybrid thermal control coatings. Journal of Inorganic Materials, 33(8), 914-918. doi: org/10.15541/jim20180092

6. Gardelle, B., Duquesne, S., Vandereecken, P., Bellayer, S., & Bourbigot, S. (2013). Resistance to fire of intumescent silicone based coating: The role of Organoclay. Progress in Organic Coatings, 76(11), 1633- 1641. doi: org/10.1016/j.porgcoat.2013.07.011