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Monday, 23 September 2019
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Raw materials & technologies, Raw materials, Coatings additives

Encapsulation to prolong lifetime of biocides

Monday, 19 November 2012

New study shows that encapsulation prolongs the lifetime of biocides in different matrices by protecting them from leaching and by releasing them slowly

The lifetime of biocides can be prolonged by polymeric encapsulation

Source: Arbi Babakhanians/Fotolia

The lifetime of biocides can be prolonged by polymeric encapsulation

Source: Arbi Babakhanians/Fotolia

Water-soluble biocides are prone to excessive leaching and high concentrations are therefore required in surface coatings for successful protection of a surface against biodeterioration. Encapsulation prolongs the lifetime of biocides in different matrices by protecting them from leaching and by releasing them slowly.

In a new study, sodium benzoate as a model water-soluble biocidal agent and Congo Red dye as a capsulation indicator were incorporated into branched polyethyleneimines (PEIs) with molecular weights of 1300 and 5000 g/mol. Microscopic investigations verified that the Congo Red dye and sodium benzoate were entrapped within the capsules. The encapsulation capacity, release behaviour and efficiency of the encapsulated model biocide against two brown rot species were determined. The encapsulated water-soluble model biocide inhibited the growth of the decay fungi. The release of the biocide was based on slow diffusion from the capsules. The molecular weight of the encapsulated agent and the polyethyleneimine affected the release rate.

The study "Slow release of a biocidal agent from polymeric microcapsules for preventing biodeterioration” will appear in Progress in Organic Coatings, Vol. 76, issue 1, January 2013.

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