Abstract
In this work, modified silicone tie-paints were prepared in a simple way for securing adhesion between the epoxy anticorrosive primer and silicone fouling release coating. Hydroxy-terminated polydimethylsiloxane (PDMS) mixture containing fillers and accessory ingredient was prepared as base component. N-(2-Aminoethyl)-3-aminopropyltrimethoxysilane (DAMO) was mechanically mixed with other functional additives as curing component. ATR-FTIR, XPS, SEM and tensile tests were used to investigate the chemical structure, morphology and mechanical properties of the tie-coatings. It was focused on the effect of the DAMO content on the adhesion of the tie-coating to epoxy primer. Peel off and shear tests were carried out to evaluate the adhesion. The results showed that introducing DAMO can significantly improve the properties of the tie-coating. The adhesion between the tie-coating and the epoxy primer increases with the increase of DAMO content, but the excessive DAMO content will decrease the fracture strength of the tie-coating and decrease the quality of the coating. When the DAMO content in tie-coating is 1.97 wt.%, the tie-coating performs excellent in the interlaminar adhesion, shear strength and mechanical properties.
Highlights
Human marine activities have long been plagued by biofouling
Tetraethyl orthosilicate (TEOS), dibutyltin dilaurate (DBTDL) and dimethylbenzene are all of analytical grade and purchased from Kemiou Chemical Reagent Co., Ltd. (Tianjin, China)
With the reason increase ofthe improvement was that only one active hydrogen was needed for the ring-opening reaction for the improvement was that only one active hydrogen waswas needed for theThe ring-opening content, the interlaminar adhesion and shear strength improved
Summary
Human marine activities have long been plagued by biofouling. For example, biofouling on the surface of a ship will increase the weight of the ship, reduce its performance, corrosion promotion and increase the cost of hull maintenance [1,2]. The interlaminar bonding strength between the silicone antifouling coatings and the epoxy primer were poor due to the surface properties of silicone such as low chemical reactivity and low surface energy [15,16,17,18]. Wang et al [19] modified epoxy coating surface via corona discharge pretreatment, and the coronapretreated surface was silanized with vinyltrimethoxysilane to generate vinyl groups, and reacted with the silicone resin to increase adhesion This method requires special instruments, and the process was costly for engineering application. Samples with varying DAMO contents in tie-coating were prepared, and the interfacial morphology, tensile properties, chemical structure of the tie-coating and interlaminar bonding strength between coatings were investigated The aim of these works is to study the effect of DAMO on silicone tie-coating adhesion to epoxy primer
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