A new study on binder performance and formulation modification of anti-corrosive primer based on ethyl silicate resin

Hoshyargar, Faegheh, Sherafati, S. Ali, & Hashemi, Mohammed M. (2009) A new study on binder performance and formulation modification of anti-corrosive primer based on ethyl silicate resin. Progress in Organic Coatings, 65(3), pp. 410-413.

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Abstract

Zinc-rich ethyl silicate coatings are quite successful in protecting steel against corrosion under severe exposing conditions. In spite of providing excellent cathodic protection to steel structure after film curing, two-component zinc-rich ethyl silicate coatings have some limitations, one of which is inadequate shelf life as a result of in-can binder gelation. In this work, the preparation steps of ethyl silicate such as pre-hydrolysis, dehydration and organometallic reactions were surveyed and herein an approach towards understanding the cause and effect relationship of the use of ingredients is presented. The effects of water and catalytic acid dosages on gel time under accelerated conditions and the effect of alcoholic solvent order on the rate of the hydrolysis and dehydration reactions were studied via Karl-Fischer test determining the water content of hydrolysate. A thriving optimization in shelf life without any loss in physical–mechanical characteristics of the final film (e.g. hardness, adhesion, solvent and salt spray resistance) was obtained.

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ID Code: 79405
Item Type: Journal Article
Refereed: Yes
Keywords: Ethyl silicate binders, Zinc-rich ethyl silicate primer, Pre-hydrolysis, Partial hydrolysis, Gel time, Shelf life
DOI: 10.1016/j.porgcoat.2009.02.006
ISSN: 0300-9440
Copyright Owner: Copyright 2009 Elsevier B.V.
Deposited On: 12 Dec 2014 00:37
Last Modified: 18 Dec 2014 00:20

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