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Preparation of PAN/Polyacrylate Wrap Carbon-black Emulsion and Study of Anti-corrosion Performance

Author: XiaoWeiLing
Tutor: QiangMin
School: Wuhan University of Science and Technology
Course: Chemical Engineering
Keywords: Polyaniline Polyacrylate Package Water-based paint Emulsion Polymerization Carbon black Anti-corrosion
CLC: TG174
Type: Master's thesis
Year: 2008
Downloads: 166
Quote: 1
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Abstract


Metal anti-corrosion coatings contain volatile substances polluting the environment, and water-based paint has the advantages of non-toxic, environmentally friendly, and to study the water-soluble polymer will expand the scope of application of the polymer in the field of corrosion inhibition performance of metal. Polyaniline having a metallic anti-corrosion function, to form a dense oxide film on the metal surface; aqueous polyacrylate having a good film-forming properties as well as gloss, corrosion resistance and strong; carbon black having a spherical shape, the sheet structure, the conductive self-lubricating characteristics. The use of emulsion polymerization prepared the polymer encased carbon black composite coatings, greatly improving the anti-corrosion effect of the polymer. Measured under different conditions as polyaniline, carbon black emulsion polyacrylate parcel corrosion current to determine the optimum reaction conditions for the two systems. Polyaniline system, when the reaction time was 4h, the polymerization temperature was 25 ° C, NSDS: nan = 1.5 NaPS: nan = 1.5, the mass ratio of carbon black and aniline was 0.5%, the type of acid is hydrochloric acid, pH is 2 when the resulting emulsion stability is good, the film is also better. In the 3.5wt% Nacl corrosion medium carbon steel corrosion current 10-5.94A/cm2, after finishing polyaniline emulsion 10-7.94A/cm2 10-8.92 A/cm2 after finishing polyaniline wrapped carbon black emulsion ; electrochemical impedance spectroscopy (EIS) that polyaniline wrapped carbon black emulsion coating anti-corrosion effect than pure polyaniline; scanning electron microscopy and electron microscopy showed that the polyaniline polyaniline wrapped carbon black and carbon black to form emulsion. Polyacrylate system, when MAPS: MSDS: MMMA: MBA = 1:20:100:100, the quality of the carbon black accounted for 0.2% of the MMA monomer, the aqueous coating as A3 steel coating in 3.5 wt% NaCl solution corrosive environment, the corrosion current 0.79μA, low 1.58μA compared to pure polyacrylate coating; electrochemical impedance spectroscopy (EIS): polyacrylate-the wrapped carbon black emulsion coating against corrosion. better than pure polypropylene ester Good, have greatly improved their impedance values; scanning electron microscopy showed that most of the carbon black particles are uniformly dispersed in the polyacrylate micelles, thereby preparing a the polyacrylate wrapped carbon black aqueous coating and improve its protection against corrosion. Polyaniline and polyacrylate latex blending experiments show that: the blend in order to improve its adhesion, but the antiseptic effect is greatly reduced and may be polyaniline molecules are destroyed, affecting the passivation film is formed, while the acidic medium to accelerate the corrosion rate .

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metal corrosion protection,metal surface treatment > Corrosion control and protection
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