Effect of epoxy resin/silane on physical properties of films for metal surface coating

Abstract

Physical and mechanical properties of epoxy resin-based coating were improved using either a combination of silane coupling agent (AEAPS) and epoxy resin or epoxy resin alone. The AEAPS addition to epoxy resin at the concentrations of 1, 3 wt% having film thickness of 25-100 um showed the better adhesion on steel than that with the epoxide resin. The epoxy resin cured with AEAPS 7 wt% having the film thickness of 100 um, could withstand heat at temperature of 300℃ for 20 minutes. The heat resistance result was measured in terms of color difference (∆E*) by a colorimeter, from which the ∆E between the coated film from epoxy resin/AEAPS and from the epoxy alone was 3.4 The coating was The coating was additionally tested for its heat resistance by TGA. We found that when the coating containing 1-7 wt% of AEAPS, the heat resistance increased by increasing AEAPS concentration. The heat resistance of the film having the epoxy resin/AEAPS could be analyzed from FTIR technique, in which a Si-O-Si crosslinking position was found to affect the heat endurance and corrosion prevention. According to the corrosion resistance testing, we found that the use of AEAPS curing agent at 7 wt% of a 100 um film could prevent the occurrence of corrosion for 1000 hours. The rate of corrosion was found to be 0.39 mil per year (10 um per year). The flooring with AEAPS addition to epoxy resin at the concentrations of 3 and 5 wt% or with epoxy resin cured with AEAPS 15.5 wt% increased the film’s mechanical propertie, hardness, compressive strength and chemical resistance than that containing only epoxy resin.