Preparation Of Conductive Modified Muscovite And Its Anti-corrosion Properties

Microcrystalline muscovite is a 2:1 layered silicate mineral material with many excellent properties,such as corrosion resistance,thermodynamic stability.Muscovite is widely used in plastics,coatings,rubber and other fields.Poly 2,3-dimethylaniline（Poly 2,3-dimethylaniline,P（2,3-DMA））is one of the main derivatives of polyaniline,with good corrosion resistance,and P（2,3-DMA）by introducing two-CH₃ on the benzene ring can effectively increase the solubility of polyaniline.Sb-doped Sn O₂（Antimony-doped Tin Oxide,ATO）has received great attention and in-depth research due to its excellent conductivity,high sensitivity,and high stability,and the metal oxide itself has a certain degree of corrosion resistance.Separately P（2,3-DMA）/muscovite,ATO/muscovite composite materials were preparee,which will give muscovite conductivity.Conductive muscovite has anti-corrosion properties.As an additive to paint,it imparts electrical conductivity to the paint and can also be used in the field of anti-static,which greatly increases the use of muscovite.In this paper,organic muscovite was prepared by thermally modifying muscovite,acid leaching,lithium nitrate,and Cetyltrimethylammonium bromide（CTAB）.In this paper,poly 2,3-dimethylaniline/organic muscovite（P（2,3-DMA）/OM）and ATO/muscovite composite materials were prepared by in-situ intercalation polymerization and chemical co-precipitation.The prepared two kinds of conductive muscovite composite materials were respectively tested by X-ray diffractometer（XRD）,infrared spectrum analyzer（FTIR）,thermogravimetric analyzer（TG）,scanning electron microscope（SEM）,four-probe tester To characterize,at the same time use the electrochemical analyzer to explore the anti-corrosion effect of the composite coating on the metal.The results showed that:1.After organic modification of muscovite,the interlayer changed from hydrophilic to hydrophobic,and the interlayer distance increased from 1.02 nm to1.42 nm;the prepared P（2,3-DMA）/OM composite material was intercalation/peel Type composite material,and the prepared P（2,3-DMA）/unmodified muscovite is a traditional composite material,indicating that the organic modification of muscovite is effective;the thermal stability of the prepared composite material is significantly better than pure P（2,3-DMA）,this is because the dispersed muscovite in the composite has the function of penetration/diffusion barrier;when n（APS）/n（2,3-DMA）=2.5:1,n（H₃PO₄）/n（2,3-DMA）=2.5:1,the reaction temperature is 30℃,the reaction time is 9 h,m（OM）/m（2,3-DMA）=6%,the composite material has the best Conductivity;electrochemical test results show that the coating has the best anti-corrosion performance when the P（2,3-DMA）/OM composite content is 7%;P（2,3-DMA）/OM is formed with epoxy resin The anti-corrosion performance of the composite coating is better than P（2,3-DMA）/epoxy composite coating.When the ratio of muscovite and monomer is 6%,the composite coating has the best anti-corrosion effect on metal.2.The ATO/muscovite composite material was prepared by co-precipitation method.The results of XRD,SEM,FTIR,TG and other results show that the prepared composite powder still retains the basic framework structure of muscovite,and Sn O₂diffraction peaks appear on some crystal faces,and Sn O₂ It is located on the surface of muscovite in the form of particles,forming a coated structure of ATO/muscovite;TGA test shows that the main component of the ATO/muscovite composite precursor loaded on the surface of the muscovite is Sn hydrolysis containing crystal water Product Sn O₂×x H₂O;when m（Sn Cl₄）:m（muscovite）=1:1,n（Sb）:n（Sn）=7:43,water bath temperature 30℃,calcination temperature 700℃ and calcination The composite material has the best conductivity when the time is 1.5 h;the electrochemical test results show that when the addition amount of ATO/muscovite composite material is 7%,the coating has the best corrosion resistance;ATO/muscovite and epoxy resin The anti-corrosion performance of the composite coating is better than the muscovite/epoxy composite coating.When n（Sn Cl₄）:n（muscovite）=5:5,ATO/muscovite composite coating has the best anti-corrosion performance.The electrochemical test results show that the ATO/muscovite epoxy resin composite coating can protect the metal from being corroded by external erosion media.