The Interfacial Structure and Adhesion Mechanism of N-(2-Aminoethyl)-3-aminopropyltrimethoxysilane and Epoxy Modified Silicone Tie-Coating to Epoxy Primer.

Hongyang Zhang,Qiang Yang,Yuhong Qi,Zhanping Zhang

doi:10.3390/polym13173001

Abstract

The matching application of silicone antifouling coating and epoxy primer is a major problem in engineering. Novel epoxy-modified silicone tie-coating was prepared to tie epoxy primer and silicone antifouling coating. Firstly, N-(2-Aminoethyl)-3-aminopropyltrimethoxysilane was mechanically mixed with bisphenol A epoxy resin to form silylated epoxy resin, then the silylated epoxy resin was uniformly mixed with hydroxy-terminated polydimethylsiloxane and a curing agent and catalyst for coating. An infrared spectrometer, differential scanning calorimeter and tensile tests were used to investigate the chemical structure, phase transition temperature and mechanical properties of the tie-coatings. The interlaminar adhesion of the matching coating system was tested and analyzed by a peel-off test and a shear test. Fracture morphology was observed by scanning using an electron microscope. The results showed that crosslinking density of the tie-coating, the elastic modulus and the tensile strength of the coating increased with an increasing epoxy content, but fracture elongation decreased. The shear strength of the matching coating system is 0.37 MPa, and it shows a good tie performance. The maximum anti-peeling rate of the tie-coating on the epoxy primer reaches 100%.

Highlights

For a long time, marine ships have been facing the harm of marine corrosion and marine fouling
Its adhesion on the epoxy primer is poor, and it falls from the epoxy primer, resulting in a failure of the antifouling effect [13,14]
In our previous study [13], we introduced a certain amount of N-(2-Aminoethyl)-3-aminopropyltrimethoxysilane (DAMO) into PDMS by mechanical mixing, and the coating was cured under the action of the catalyst and a curing agent

Summary

Introduction

Marine ships have been facing the harm of marine corrosion and marine fouling Given this problem, the use of functional coatings has become an effective solution. An epoxy primer is a common anti-corrosion coating, which has good corrosion resistance, good mechanical strength and good adhesion with the substrate. It is an important coating in ship protection [1,2,3]. The mature antifouling coatings include low surface energy antifouling coatings [5], self-polishing antifouling coatings [6] and amphiphilic antifouling coatings [7,8], etc These coatings are widely used, and their functional effects and economic benefits are indispensable. Its adhesion on the epoxy primer is poor, and it falls from the epoxy primer, resulting in a failure of the antifouling effect [13,14]

Methods

Results

Conclusion