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Home  > Forum  > Raw material selection  > Raw materials to produce can coating?

Friday, 07 August 2020

Raw materials to produce can coating?

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Wednesday 01 January 1997 1:00:00 am

Which are the essential raw materials to produce can coating?

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Monday 03 February 1997 1:00:00 am

The coatings used to coat the insides of cans for food and drinks always have to fulfil two requirements. The material of the
coating must not give off any traces of the substance (residual solvents or monomers), and the coating itself must be sufficiently
impervious or free of pores for there to be no contact between the contents and the metal of the can. In addition, the choice of
the material used for the coating is decided by the contents in question and by whether the can undergoes considerable
deformations during manufacture, which would require a corresponding ductility in the layer of coating.


In many cases, for contents which have only a moderate level of reactivity, the coatings used for the inside of the can may be
oil-modified phenol resin systems, for example, or indeed epoxy phenol resin coatings. If a relatively high capacity for
deformation is required, then loosely cross-linkable resins based on p-cresol and phenol are a possibility, in some cases
combined with polyvinyl butyral to improve adhesion and for plasticization.


Especially in the case of drinks cans, coating compositions which are largely free of VOCs are being used more and more.
These include graft copolymers based on epoxy resin which contain styrene, ethyl acrylate and acrylic acid, solubilized with
dimethyl aminoethanol and glycol ether, which can be used in water-thinnable form. In some cases, pigments such as ZnO are
included, when a small amount of H2S is released by the contents, or in general aluminium pigments are used to increase the
blocking capacity of the coating.


To coat the outside of the can, in many cases combinations of acrylic and melamine formaldehyde are used, and recently these
have also been applied in water-thinnable form. In addition, acrylate can coatings which may be cross-linked by UV radiation
are gaining in importance.

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Friday 26 July 2019 11:53:06 am

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