Application study on the dispersion and corrosion resistance of functionalgraphene oxide in powder coatings (I.)

abstract:surface by gamma-(2,3-epoxy propylene) propylene triethylsilan (KH560) modified graphene oxide (GO) and no-food acid-based epoxy resin (GEP) mixed to form functional graphene oxide (FGO), can effectively improve the dispersion of GO, and thus make it uniformly dispersed in the powder coating, through electrostatic spray successfully prepared anti-corrosion coatinguse SEM, Fourier Infrared Spectrometer (FTIR), salt spray test, impact test, contact angle test, aging test, etcto characterize and test GO and coating performanceexamined the effect of THE DISPERSION OF KH560 dosage in THF and powder coatings, and thealso examined the effect of KH-560 modified GO dosage on coating performanceThe results of theshow that the coating prepared with KH560 functional GO has excellent anti-corrosion and mechanical propertiesforeword
metals are widely used in national life, but they are faced with the problem of corrosion, according to relevant reports, each year due to corrosion to the national economy has brought considerable losses, and also caused some harm to the environmentcoating is an effective protective means and one of the most widely used anti-corrosion technologyone of the coating resins commonly used in epoxy and polyester resins, with excellent properties, and is widely used in anti-corrosion coatingsGO has a stable structure, excellent toughness, hardness and excellent decorative properties, in various fields have great application prospectsbut GO has both hydrophobic nature, so that there are certain obstacles in its applicationif applied in powder coating, can not be mixed with the powder, reduce the stability of the coating, and then cause defects to the coating, reduce the corrosion resistance of the coating, greatly reducing the feasibility of GO applicationtherefore modified to GO, improved dispersion in powder coatings, and is essential for GO anti-corrosion powder coatingsZhou Nan and so on GEP as graphene dispersant, successfully improve the dispersion of graphene in organic solvents, and GEP can participate in the reaction, further improve the stability of the coatingParhizkar and so on with triamin propylene trixanesilan (APTES) modified GO, APTES modified GO not only covalent bond action (amino and GO) but also the presence of siliconoland and hydroxyl and radical pyridine agility reaction, improve GO dispersion in epoxy resin, but also improve anti-corrosion performanceZheng and others grafted the aldehyde on to the GO tablet layer through polymer agtrenchtion reaction, improving its dispersion and corrosion resistance in epoxy resinRamezanzadeh and so on through the covalent bonds will successfully modify the benzodiazepine GO, and obtain a good blend of epoxy resin anti-corrosion coating, in the corrosion resistance has been greatly improvedthis paper will not only use GO as a filler for special functions, but also study FGO as a reaction objectthe combination of the KH560 modification and GEP effectively inhibited the secondary stacking of graphene, and then made a powder edg FGO, FGO added to the powder coating, so as to obtain a graphene anti-corrosion powder coating with excellent dispersion and anti-corrosion propertiesFGO preparation5gGO (GO by ultrasonic peeling 6h to form a small layer GO), 500gTHF high-speed dispersion 10min, placed in the ultrasonic equipment, KH560 (1w, 2w, 3w, 4w, 5w), relative to GO quality) dosage, 0.5g acetic acid added to the four-mouth flask, 40 C water bath reaction 8h, add 15gGEP (GEP preparation details in literature 1), stirred evenly, using low temperature cooling dry, powdered FGOFigure 1KH-560 modified graphene schematic
FGO anti-corrosion powder coating and coating preparationtable 1 is the base formula of powder coating, the preparation of the FGO powder directly added to the powder coating stirred evenly, through the sieve (200 eyes) is the FGO anti-corrosion powder coatingthe use of electrostatic spraying method, the powder is sprayed on the phosphated horse-mouth iron, at 200 degrees C, curing 10min, that is, FGO anti-corrosion powder coating, paint film thickness of about 70 to 80 smThe effect ofKH-560 usage on GO dispersionmodified theGOwith KH-560 ,
and examined the effect of the of KH-560 on the dispersion of GO, with the results shown 2 figure
2 different KH-560 dosage decoration
GO SEM can be seen by Figure 2, when the kh560 dosage is 0, THE AMOUNT of GO accumulation is less, the dispersion is better, when the amount is 4.0wt.%, the largest amount of accumulation , with the increase of usage, the amount of GO accumulation is increasing, and dispersion decreases When the amount of KH560 is less, the hydrolysis is only covered on the surface of GO, and there is no reaction between KH560, which reduces the interaction between GO and slugs, thus increasing dispersion when the amount of KH560 is more, not only with GO contraction reaction, but also self-shrinking reaction, so that GO stacking reunion phenomenon the preparation and characterization of FG
the structural changes of the coating after GO, KH560-GO and curing are analyzed by infrared spectroscopy, as shown in Figure 3 a-GO; b-KH560-GO; c after curing coating Figure 3 THE INFRARED SPECTROSCOPY OF GO, KH560-GO AND THE COATING AFTER CURING
FIGURE 3 CURVEA CORRESPONDS TO THE ABSORPTION PEAKS OF 3430CM
-1
, 1740CM
-1
AND 1025CM
-1
RESPECTIVELY Is - OH, C-O and C-O-C feature peak, in the 1640cm
-1 and 1410cm
-1 of the absorption peak corresponding to - (C-O) - and -COO-- curve b absorption peak at 1035cm-1 is the characteristic peak of Si-O-C, indicating that GO has been decorated by KH560, compared with curve a, the characteristic peak of 1740cm
-
1 and 1410cm
-1 disappeared or weakened, indicating that GOKH has been modified by 560 ; The absorption peaks at 810cm
-1 and 1130cm -1 are si-O-Si characteristic peaks, indicating an antibiotic reaction between the molecules after THE hydrolyzed KH560 , and the absorption peak sat in the 915cm -1 is the cyclic oxygen-based characteristic peak, indicating the existence of 560 curve c in 1210cm -1 absorption peak is the characteristic peak of C-N, between 1540 to 1570cm
-1 no N-H absorption characteristic peak, and in 915cm
-1 no epoxy-1 absorption characteristic peak, indicating that the metacylamine and epoxy-based complete reaction is not yet complete