Study On The Synthesis Of Functionalized Silicone And Its Modified Epoxy Resin Properties

As we all know,the ocean is a complex corrosive environment.Seawater itself is a strong corrosive medium.At the same time,waves and waves will have an impact on metal components.Coupled with various factors such as marine microorganisms and attached organisms,it will cause corrosion.The direct or indirect acceleration effect causes the metal substrate to degrade easily.Therefore,corrosion resistance is an important criterion for evaluating metal-based materials.Organic coatings are widely used in the protection of metal-based materials by forming a physical barrier between corrosive media and the substrate,thereby slowing the corrosion rate of the substrate.Among them,epoxy coatings have become the most commonly used coating types due to their excellent physical and chemical properties and strong adhesion.Silicone materials not only have the characteristics of high temperature resistance and good thermal stability of inorganic materials,but also have the advantages of flexibility of organic materials.At the same time,the low surface energy of silicone materials makes it a very important raw material for superhydrophobic materials.The internal stress of epoxy resin is large,and the epoxy resin has certain requirements on the temperature of the environment during use.However,the flexibility of silicone and the excellent ability of thermal decomposition can just make up for these shortcomings.Epoxy resins can comprehensively improve the performance of epoxy resins,and have received more attention in recent years.Silicone-modified epoxy resin is widely used in high-end electronic devices,aerospace and other fields due to its excellent performance.At present,most researches focus on using its organic-inorganic hybrid characteristics to enhance epoxy resin while improving its high temperature resistance and dielectric properties.There is little work in applying silicone materials to the field of metal corrosion protection.This article first summarizes the research status of silicone-modified epoxy resin,and then separately synthesizes silicone active diluent SEE and silicone active nano-additive Oap POSS-MA,and uses them to modify epoxy resin.After a comparative study of various properties of the modified resin,it was found that the silicone nano-additives hardly lose other properties while enhancing the epoxy resin.On this basis,anticorrosive coatings containing silicone nano-additives were prepared and the anticorrosive properties of the coatings were systematically studied using electrochemical methods,and the morphology and composition of corrosion products on metal substrates were further analyzed.The specific research results are as follows:(1)Bio-active diluent SEE was synthesized using eugenol,a natural material that is easily accessible and environmentally friendly.By adding different amounts of SEE,the amount of addition that makes the modified epoxy composite material have the best performance was found.The chemical structure of SEE was characterized by FTIR and NMR.The addition of SEE reduces the viscosity of the epoxy resin system.In addition,the water contact angle test shows that a small amount of SEE will make the surface of the epoxy system hydrophobic.TGA test proves that adding SEE can significantly increase the thermal decomposition temperature of epoxy resin system.The results show that after 15 wt% SEE is incorporated into the epoxy resin system,the composite material shows high temperature resistance and water resistance.(2)Aminopropyltriethoxysilane is synthesized by direct hydrolysis method of octaaminocage silsesquioxane.Because it is a solid powder,it is further modified with diethyl maleate to obtain a reactive Nano-additive Oap POSS-MA is a yellow viscous liquid,which improves the compatibility with epoxy resin.Because its structure contains active hydrogen,it can be used as a curing agent to participate in the curing process and enter the epoxy network structure.The multifunctional structure makes it serve as a crosslinking center to further increase the crosslinking density of the cured epoxy resin.The functional modification of the nano-additive improves its compatibility with epoxy resin.In addition,TGA and DCS tests show that the heat resistance of the coating has also been improved.This is because Oap POSS-MA enhances the denseness of the epoxy network.At the same time,its stable cage structure inhibits the movement of molecular chains in the epoxy resin and gives the epoxy resin composite good thermal stability.(3)A corrosion-resistant coating containing silicone active nano-additives was prepared.The multi-functional structure makes this nanoparticle as a cross-linking center to improve the density of the coating,thereby improving the shielding performance of the corrosion-resistant coating,better To prevent the corrosive medium from contacting the metal substrate.Using electrochemical impedance spectroscopy and analysis of corrosion product morphology and composition,the corrosion resistance of the coating was explored.This kind of silicone active nano-additives significantly improved the shielding performance of the coating.TGA and DCS tests show that the heat resistance of the coating has also been improved.At the same time,its inorganic core inhibits the chain movement of epoxy molecules and gives the coating good thermal stability.The results show that,when 1 wt% of Oap POSS-MA hybrid is incorporated into the waterborne epoxy coating,the corrosion resistance of the coating is significantly improved.