Development of high-adhesive protective coatings based on functionalized acrylic copolymers

The article presents the development of a technology for producing new high-adhesion protective coatings based on functionalized acrylic copolymers synthesized from a locally sourced nitrogen-containing oligomer and acrylic acid. The radical copolymerization process was carried out in the presence of redox initiators at a temperature of 60±2 °C and a pH value of 7.0–7.2. The formation of the macromolecular chain with the presence of carbonyl and amide groups was confirmed by FTIR spectroscopy. For the first time, in accordance with the international standard ISO 4589, the limiting oxygen index (LOI) of the synthesized copolymer was determined using a GD ISO 4589-1 digital tester, reaching 31.8%, which is 1.6 times higher than the performance of the industrial analogue (BMK-5). It was found that the pull-off adhesion strength of the coatings (ISO-4624) reaches 0.80 MPa, due to the formation of coordination bonds between the lone pairs of nitrogen atoms in the functional groups and the vacant d - orbitals of the metal surface. It is shown that the developed technology allows reducing the drying time of the coating to degree 3 according to GOST 19007-73 from 24 to 16 hours. The research results serve as a scientific and technical basis for the creation of import-substituting, flame-retardant, and high-adhesion anticorrosion protective coatings. 

1. Шайкулов Б.К., Гулбоева Д.Р., Тиллаев А.Т., Нуркулов Ф.Н. Исследование физико-химических свойств сополимера, синтезируемого на основе акрилового мономера и уретанового олигомера // Лакокрасочные материалы и их применение. 2025. № 6. С. 26–29.

2. Нуркулов Ф.Н., Шайкулов Б.К., Джалилов А.Т. Синтез и исследование свойств акрилат-уретановых сополимеров // Журнал прикладной химии. 2022. Т. 95, № 4. С. 512–518.

3. Shaykulov B.K., Nurkulov F.N., Jalilov A.T. Synthesis of low molecular weight sodium polyacrylate by redoxinitiated polymerization // Universal Journal of Chemistry and Chemical Technology. 2023. Vol. 11, No. 2. Р. 45–52.

4. Zheng H., et al. Adhesion mechanisms of nitrogencontaining acrylic copolymers on metallic substrates // Journal of Adhesion Science and Technology. 2024. Vol. 38, No. 5. Р. 1120–1135.

5. Шайкулов Б.К. Исследование физико-химических свойств сополимеров на основе акриловых и азотсодержащих олигомеров // Композиционные материалы (Ташкент). 2022. № 2. С. 22–25.

6. Beknazarov K.S., Jalilov A.T. Oligomeric corrosion inhibitors based on local raw materials // International Polymer Journal. 2021. No. 3. Р. 88–94.

7. Шайкулов Б.К. Синтез натрий полиакрилата с низкой молекулярной массой и кинетические аспекты процесса передачи цепи: автореф. дис. ... д-ра филос. (PhD) по техн. наукам. Ташкент, 2023. 42 с.

8. Wang L., et al. Synthesis and characterization of watersoluble nitrogen-doped polyacrylates for industrial applications // Polymer Bulletin. 2025. Vol. 82. Р. 301–315.

9. Nurkulov F.N., et al. Synthesis and characterization of water-soluble acrylic copolymers for industrial coatings // Polymer Bulletin. 2025. Vol. 82, No. 1. Р. 112–128.

10. Smith R.J., et al. Standard methods for pull-off adhesion testing of protective coatings according to ISO-4624 // Journal of Adhesion Science. 2024. Vol. 38. Р. 901–915.

11. Ismailov M.I., et al. Physicochemical properties of composite materials based on modified polyacrylates // Uzbek Chemical Journal. 2023. No. 2. Р. 34–40.