Features of Polyester Resins in Terms of Their Use for Varnishing Canning Containers, with Improved Stamping Resistance | ||||
| Egyptian Journal of Chemistry | ||||
| Article 5, Volume 62, 2nd International Conference on Agricultural Biosystems (AGRIBIOS 2019) on 28,29 September 2019 in GBC meeting and conference room, Deira, Dubai, UAE., December 2019, Page 23-33 PDF (1.4 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejchem.2019.18286.2122 | ||||
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| Authors | ||||
Nikolay Apanovich  ; Elena Maksimova; Alexandra Zelenskaya; Anton Alekseenko; Alexander Pavlov; Denis Kapitonov
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| D. Mendeleev University of Chemical Technology of Russia, Moscow, Russian Federation | ||||
| Abstract | ||||
| Currently, the biggest share of paints and varnishes intended for painting internal surface of metal canning containers is accounted for by compositions containing epoxy oligomers. Despite the fact that such materials allow to obtain coatings with good adhesion to metal substrates, sufficient chemical resistance and elasticity, they have one significant drawback, which is due to the main component of epoxy resins – bisphenol A. Due to the well-known negative effects of bisphenol A on human health, the use of such materials is currently limited. Promising replacement are composites based on polyester resins. However, it should be mentioned that the disadvantage of polyester varnishes intended for canning containers is the low resistance of coatings to sterilization when laying food products. The main reason for such low resistance is a relatively high proportion of ester groups, characterized by low water, alkali and limited acid resistance. To increase the resistance of such coatings, we proposed to introduce fragments of unsaturated monomers (capable of homopolymerization under the conditions of polyester compositions curing) into the composition of their polymer macromolecules. These fragments should create an additional steric hindrance for diffusion to ester groups of destructive molecules of aggressive media and ensure the durability of coatings in general. Synthesis of such polyesters is a typical polycondensation process, and to accelerate it, it is advisable to use various catalytic systems. | ||||
| Keywords | ||||
| Polyester resins; can coatings; varnishing of tin; catalysis at polycondensation | ||||
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