Anticorrosive self-adhesives from post-consumer PET bottles

A new study describes the development of anticorrosive self-adhesives from post-consumer poly(ethylene terephthalate) bottles for industrial applications.

Used PET bottles can be a resource for new coatings and applications. Image source: Quelle fotblend - Pixabay (symbol image).

One of the most commonly employed methods for mitigating the effects of corrosion is the application of organic coatings. However, no coating is precluded from potential damage, whether due to factors such as end-of-life degradation, inadequate application, poor quality, or impact-related incidents. Within this context, the primary objective of the new study was to develop a novel and easy to apply anticorrosive adhesive for carbon steel surfaces from post-consumer poly(ethylene terephthalate) (PET) bottles as a temporary coating. PET films were produced by phase inversion technique, which involves the dissolution of PET bottles in a mixture of trifluoroacetic acid (TFA) and dichloromethane (DCM) solvents, followed by precipitation in a non-solvent bath. The resulting films were utilised as backing materials in the production of self-adhesive tapes with anticorrosive properties.

Improved outcomes

Two different solvent proportions were selected to assess the feasibility of this technique, which are 70/30 and 50/50 (TFA/DCM v/v). Experimental results revealed that the utilisation of a solvent system with a higher concentration of DCM produces a more cohesive and denser film, leading to improved outcomes in both total immersion and electrochemical impedance spectroscopy tests.

The study has been published in Progress in Organic Coatings, Volume 183, October 2023.

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