Preparation Of Modified MoS₂/Epoxy Composite Coating Materials And Study On Anti-corrosion/Superhydrophobic Properties

Epoxy resin（EP）has become one of the most widely used coatings substrates in recent years.It is found that adding inorganic fillers can effectively improve the shortcomings of EP,such as poor permeability and many internal pores.Molybdenum disulfide（MoS₂）is a two-dimensional lamellar inorganic material with strong chemical stability and active groups on its surface.Through chemical grafting modification,MoS₂ can better adapt to the organic coating system and enhance the coating properties.However,the high humidity sensitivity and less surface active groups of commercially available lamellar MoS₂ affect the further application of MoS₂.In order to solve the above problems and explore the application prospect of functional modification of MoS₂,this paper first successfully prepared hollow bulb MoS₂ by one-step hydrothermal method and explored the preparation process of MoS₂.Secondly,silane coupling agent KH570 was used to improve the dispersion of EP,and the effects of different structures and modified MoS₂ on EP properties were investigated.Finally,perfluorosilane coupling agent PFDMS was used to functionize MoS₂ and prepare PFDMS-hollow flowerball MoS₂ material with superhydrophobic properties.The superhydrophobic organic coating material was successfully prepared with powder Epoxy resin as the base material.The properties and conclusions of the coating were explored.（1）Preparation,characterization and preparation process of hollow bulb MoS₂.The test results show that all the MoS₂ structures prepared by one-step hydrothermal method are stable 2H phase.In this preparation method,the main factors affecting the formation of MoS₂ are as follows:The concentration of the raw material of the reaction solution affects the size of the microspheres.In the range of 0.2～0.05mol/L of the raw material concentration of the reaction solution,the size of the bulb MoS₂ decreases with the decrease of the concentration of the reaction solution.The selection of sulfur source and the pH value of the reaction solution will affect the molding of MoS₂.When the sulfur source is thioacetamide and the pH value is less than or equal to 5,the lamellar structure of MoS₂ is obtained.Template agent CTAB can induce the formation of core-shaped MoS₂ hollow structure,and the effect is better when the sulfur source is thiourea.（2）KH570’s modification effect on MoS₂ and the influence of MoS₂ on EP coating properties were explored.The test results show that:After the modification of flower-bulb MoS₂,KH570 can effectively reduce the agglomeration phenomenon of flower-bulb MoS₂,but the modification effect of KH570 on laminar MoS₂ is not obvious.KH570-Hollow bulb MoS₂/EP adhesion decreased the lowest,hollow bulb MoS₂/EP adhesion decreased the highest.the addition of MoS₂ improves the corrosion resistance of EP coating,and the comprehensive corrosion resistance of KH570-hollow bulb MoS₂/EP is the best within 48h of immersion time,and the corrosion resistance of lamella MoS₂/EP decreases the most with time.the salt spray resistance of KH570-bulb MoS₂/EP is the best within 168h of salt spray environment.The salt spray resistance of pure EP and bulb MoS₂/EP is poor.Pure EP coating will appear obvious corrosion holes and cracks by strong acid and alkali corrosion,MoS₂ in EP coating can effectively resist the corrosion of strong acid and alkali,and the comprehensive resistance to strong acid and alkali is KH570-flower MoS₂/EP best.（3）Hydrophobic functionalized modification of MoS₂ and preparation of superhydrophobic organic coating.After PFDMS modification,the hydrophobicity and oleophobicity of lamellated Mo S2 were enhanced,and the superhydrophobicity of hollow flowersphere MoS₂ was obtained and the oleophobicity Angle reached 120°.Modification of PFDMS can lead to obvious agglomeration of lamellar MoS₂.The powder Epoxy coating and powder polyamide coating with PFDMS-MoS₂ as filler show superhydrophobic properties.The superhydrophobic coating forms an air isolation layer before being wetted,which significantly improves the corrosion resistance of the coating.However,the superhydrophobic coating prepared by this method will gradually be wetted in water for a long time,leading to failure.