| In recent years,due to the continuous development of nano-modification technology,the application of new nano-modification technology in the field of coatings has made great progress,and its application in water-borne anticorrosive coatings has also been greatly developed.Nano zirconia has excellent chemical resistance and corrosion resistance,and is a typical material with thermal stability and chemical stability.The composite of nano zirconia with other materials can greatly improve the performance parameters of composite materials.Nano boron nitride a planar hexagonal network structure similar to graphite,and has excellent dielectric properties and corrosion resistance.Due to its excellent high thermal conductivity,it is widely used in thermal conductivity materials,and has been widely concerned in the application field of anti-oxidation boron nitride coating.Nanomaterials can graft copolymerize with epoxy groups and play a catalytic role in the crosslinking reaction of epoxy resin.At the same time,nanoparticles can also enter the micropores generated in the production process of coating,forming an effective barrier of corrosive medium,and thus improving the compactness of coating.In this paper,the surface modification of nanoparticles was carried out to modify the self-made epoxy acrylate soap-free emulsion and prepare the corresponding water-based anticorrosive coating with modified epoxy acrylate emulsion as the main film forming material.The specific research contents are as follows:（1）γ-aminopropyl triethoxysilane（KH-550）was selected to modify nano zirconia,and the mass ratio of the two was controlled as 1:0,1:0.5,1:0.8,1:1,1:1.2and 1:2.Fourier transform infrared and X-ray diffraction were used to prove that the modification was successful.Scanning electron microscope was used to observe the microstructure of nano-zirconia before and after modification,and the optimal mass ratio of nano-zirconia to KH-550 was determined as 1:0.8 by its dispersibility.Then the modified epoxy acrylate soap-free emulsion was prepared by modified nano zirconia,through contact angle and thermogravimetric analysis of dry film feeling of water and thermal stability was analyzed,and the results show that the modified epoxy acrylates soap-free emulsion of dry film is present hydrophilicity,when the adding amount of modified nano zirconia is 1 wt %,its thermal stability is the best.（2）Firstly,sodium hydroxide was selected to hydroxyl the nano boron nitride,which made the nano boron nitride with hydroxyl,so that it could be modified by KH-550 surface,and the successful modification was proved by fourier transform infrared,X-ray diffraction and X-ray photoelectron spectroscopy.Then the modified epoxy acrylate soap-free emulsion was prepared by modified nano boron nitride,through contact angle and thermogravimetric analysis of dry film feeling of water and thermal stability was analyzed,and the results show that the modified epoxy acrylates soap-free emulsion of dry film is present hydrophilicity,when the adding amount of modified nano boron nitride to 3 wt %,its thermal stability is the best.（3）Waterborne anticorrosive coatings were prepared by using modified epoxy acrylate soapless emulsion as the main film forming material.The results show that the addition amount of modified nano-zirconia is 1wt%,the impact strength of the anticorrosive coatings is up to（50 kg）·cm,the adhesion grade is 1,and the pencil hardness is up to 3H.In the 480 h salt spray resistance test,the coating only has slight corrosion at the line and no bubbles on the surface of the coating and other common coating problems.Waterborne anticorrosive coatings were prepared by using modified epoxy acrylate soapless emulsion which modified by nano boron nitride as the main film forming material.The results show thatthe impact strength of the anticorrosive coatings is up to（50kg）·cm,the adhesion grade is 1,and the pencil hardness is up to 3H.The coating showed the best resistance in 480 h salt spray test. |
PDF Full Text Request