Preparation Of Modified Nanoparticle Doped Epoxy Resin Coatings And Study On Their Performance

It is an important way to prepare the anti-corrosion and wear-resistant composite coating on the surface of steel to solve the early failure during service under extreme conditions.Epoxy resin has been widely used in the field of coating preparation due to its stable physical,chemical properties,low curing shrinkage,high tensile and flexural strength and excellent adhesion properties.However,the traditional epoxy resin coating also has the disadvantages of poor toughness,low wear resistance and high friction coefficient,which cannot meet the requirement of modern science and technology development.Therefore,considering the shortcomings of traditional epoxy resin coatings,in this paper,nanoparticles are used to modify the traditional epoxy resin coating to improve the anticorrosive and wear-resistant comprehensive performance of epoxy resin coating.Firstly,in view of traditional epoxy resin coating with high friction coefficient,PTFE is selected as the additive particles of the modified epoxy resin and epoxy-PTFE composite coating is prepared.The effect of PTFE content on the properties of the coating is investigated.The performance test results show that when the addition amount of PTFE is 15wt%,PTFE will improve the corrosion resistance of the coating and reduce the friction coefficient of the coating,but it will reduce the hardness of the coating.In order to solve the problem that addition of PTFE results in the decrease of coating hardness,the epoxy resin-PTFE coating is doped and modified by TiO₂.Due to the poor interfacial compatibility between TiO₂ and epoxy resin and difficulty dispersion,the silane coupling agent KH570 is selected to modify TiO₂.Comparison of the effects of added pre-modified TiO₂ and modified TiO₂ on properties of the epoxy resin-PTFE?15wt%?coating shows that the modified TiO₂ is more beneficial to improve the performance of coating.When the amount of modified TiO₂ added is 2wt%,the friction coefficient is reduced from 0.16 to0.1.and the polishing scratch morphology also indicates the wear resistance of the coating is improved,but the corrosion resistance of the coating after modified TiO₂ added is not improved significantly.In order to further improve the performance of epoxy resin-PTFE/TiO₂ composite coating,especially corrosion resistance,graphene oxide?GO?is selected as the nanoparticle additive particle of modified epoxy resin-PTFE/TiO₂ composite coating.In this paper,silane coupling agent KH550 is used to modify GO to improve its dispersibility.The epoxy resin-PTFE/TiO₂/GO coating is prepared by adding pre-modified GO and modified GO to epoxy resin-PTFE/TiO₂?2 wt%,modified?coating.Through performance test and result analysis,it is found that modified GO is more beneficial to improve the performance of the coating.When the added amount of modified GO is 0.5 wt%,the friction coefficient can be stabilized at about 0.09.and the corrosion resistance of the coating.Will also be greatly improved.Finally,the possibility of coatings application at low temperatures environment is studied.The low sectional appearance and bonding force of the coating are tested.The cross-sectional morphology analysis of the coating in low temperature environment show that coating with modified TiO₂ and modified GO has good toughness.And the test results of coating adhesion show that the binding force of the coating added modified TiO₂ and modified GO still maintained between 2.55-2.7 MPa,which is hardly affected by low temperature environment.