| In recent years,the situation of environmental pollution has become more and more severe.As our country’s environmental protection awareness has gradually increased,the scope of VOCs emission charges for the paint industry has further expanded.The punitive charging mechanism has taken the lead in Beijing and other places.Therefore,the development of environmentally friendly water-based coatings has become a major trend in the coatings industry.Water-based epoxy resins have become one of the most important research directions for water-based anti-corrosion coatings because of their excellent anti-corrosion properties.In this study,the non-ionic hydrophilic group was inserted into the E-44 epoxy resin by chemical grafting method,and the double bond was chosen to react with the alpha carbon on the epoxy resin chain by grafting reaction.With regard to the consumption of epoxy groups in the resin,the decreasing of crosslink density caused by the consumption of epoxy groups in the aqueous epoxy resins is currently improved.Secondly,through the reaction of the carbon-carbon double bond in the siloxane with the epoxy resin,a silicon-oxygen bond is introduced into the aqueous epoxy resin,and the silicon-oxygen bond is used to hydrolyze into a silicon hydroxy group to form a silicon-oxygen covalent bond with the substrate.The nature of the cross-linking reaction can occur spontaneously,and properties such as coating adhesion,water resistance,toughness,and heat resistance can be improved,and the problem of deterioration in the performance of aqueous epoxy resin due to the introduction of an aqueous group can be improved.Finally,by adding waterborne nano-anti-corrosion particles to the water-borne epoxy anti-corrosion coating,a new type of functional material,waterborne nano-anti-corrosion particles are added to improve the anti-corrosion performance of waterborne epoxy coatings.(1)At 90℃,p-toluenesulfonic acid was used as a catalyst,hydroquinone was used as a polymerization inhibitor,toluene was used as a water-bearing agent,and methoxypolyethylene glycol was reacted with acrylic acid for 6 hours to obtain an intermediate product of methoxy.Polyethylene glycol acrylate.Infrared spectroscopy(FT-IR)was used to determine the synthesis intermediate as the expected product,and the methoxy polyethylene glycol conversion rate was calculated by titration to determine the optimum reaction ratio of 1:1.25 and the best conversion of methoxypolyethylene glycol.The rate is 87.3%.(2)At 120℃,benzoyl peroxide was used as an initiator,and methoxy polyethylene glycol acrylate and vinyl trimethoxy silane reacted with epoxy resin for 2 h.Firstly,the grafting success of the above two substances was confirmed by infrared spectroscopy(FT-IR)analysis,and then through the emulsion storage stability and water resistance test,the optimum reaction ratio of methoxypolyethylene glycol acrylate was determined to be 10%;The glass transition temperature(Tg)of the synthesized product was determined to determine that the optimal reaction ratio of vinyltrimethoxysilane was 2%of the mass of the epoxy resin.(3)During the preparation of waterborne epoxy anticorrosion coatings,the dispersion of aqueous nanopreserved particles in the coating was observed by scanning electron microscopy(SEM);the salt spray test,acid-base immersion test,and electrochemical test were studied.The corrosion resistance of the coating;the final determination of the amount of aqueous nano-preservative particles added is 2.5%of the total coating quality.The water-based epoxy coating obtained in the final preparation had the best anticorrosion performance,with salt-fog resistance time reaching 500 hours,salt-water soaking performance increased by 200 hours,and water resistance up to 380 hours. |
