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Sunday, 22 September 2019
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Raw materials & technologies, Applications, Protective & Marine coatings

High-solids, one-coat paints based on epoxy resin-siloxanes protect steel

Wednesday, 13 August 2014

A research involved the design of high-solids, one-coat paints for the protection of metal structures with low maintenance requirements.

The salt spray apparatus showed the good results of the steel protection

Source: Liebisch

The salt spray apparatus showed the good results of the steel protection

Source: Liebisch

The main paint components were: (i) an aliphatic epoxy resin cured with an aminosilane and chemically modified with alkoxysilanes as film-forming material, and (ii) rutile titanium dioxide as opaque pigment, a polysilicate strontium and zinc as corrosion inhibitor and, a synthetic calcium silicate and barites as extenders.

Some paints displayed good anticorrosive performance

Some paints displayed excellent performance in salt spray apparatus (degree of rusting) and in 100% relative humidity cabinet (degree of blistering). Results indicate that as the aliphatic epoxy resin/alkoxide ratio increased, the degree of rusting improved while the degree of blistering worsened, in total agreement with film permeability. In addition, binders based on dimethyldiethoxysilane, methyltriethoxysilane and tetraethoxysilane, in that order, displayed an improved corrosion performance and a decreased blistering resistance. The reactivity of alkoxides and the chemical interaction with the metal substrate supports the obtained results.

Alkoxides allowed high anticorrosive resistance

Initial gloss and gloss and colour retention improved as the alkoxide level increased; no significative differences were registered when the alkoxide type variable was considered. In summary, the use of alkoxides as modifiers of an aliphatic epoxy resin allowed the formulation of hybrid paints with high anticorrosive and weathering resistance performance. The more suitable hybrid organic-inoganic paint must be selected according to the requirements of each structure in service.

The study is published in: Progress in Organic Coatings, Volume 77, Issue 9, September 2014, Pages 1459-1464.

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