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Sunday, 22 September 2019
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Raw materials & technologies, Technologies

Water and oxygen permeability of BOPP coated with hybrid UV nanocoatings

Tuesday, 9 August 2016

A paper compares the effect of precursor ratio and content of inorganic and organic phases of sol-gel based hybrid UV cured coatings on water and oxygen barrierity of biaxially oriented polypropylene (BOPP) substrates.

By increasing the inorganic content, permeability to oxygen and water vapour decreased. Source: Gitti Moser/pixelio.de

By increasing the inorganic content, permeability to oxygen and water vapour decreased. Source: Gitti Moser/pixelio.de

To this end tetraethyl orthosilicate (TEOS) and 3-methacryloxy propyl trimethoxysilane (MEMO) were used together with acrylate monomer and oligomers in different ratios. Water vapor transmission rate (WVTR) and oxygen transmission rate (OTR), were measured and discussed based on morphologies appeared.

Successful to prevent water permeation

Hybrid coatings were successful to prevent water and oxygen permeation and reduced WVTR of uncoated BOPP from 12 to 0.96 g/(m2 d). and oxygen transmission rate declined from 566 to 159 cm3/(m2 d) in comparison with substrate. It was observed that in identical TEOS ratio to MEMO, by increasing the inorganic content permeability to oxygen and water vapor decreased. Also, in constant inorganic to organic ratio (I/O = 50), by an increase in the ratio of TEOS to MEMO from 20 to 80 water vapor depreciated from 2.5 to 0.96 g/(m2 d). These results were in agreement with the degree of compactness of the networks as revealed by different analytical characterisations.

The study is published in: Progress in Organic Coatings, Volume 99, October 2016, Pages 72–79

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