Dissertation > Excellent graduate degree dissertation topics show

Effect of Surface Modification of Nano-TiO2 on the Corrosion Resistance of Polyurethane

Author: PangYu
Tutor: DuZuo
School: Nanchang University of Aeronautics and
Course: Materials Physics and Chemistry
Keywords: Nano TiO2 Graft modification Nanocomposite Coatings Corrosion resistance
CLC: TB383.1
Type: Master's thesis
Year: 2010
Downloads: 210
Quote: 0
Read: Download Dissertation

Abstract


Nano-TiO2 has a large specific surface area and the size of the fine, exhibit unique physical and chemical properties, characteristics of nano-TiO2 preparation of functional coatings in recent years has become a hot topic. In this paper, the surface modification of nano-TiO2, study modified nano-TiO2 addition on the corrosion resistance of polyurethane varnish and polyurethane topcoat. And explore the nano-TiO2 modified by RAFT polymerization, hoping to solve the high content of nano-TiO2 dispersed in the paint. Surface modification of nano-TiO2 with a silane coupling agent KH-570 on nano-TiO2 surface modification, FT-IR and TG test results show that the KH-570 was successfully grafted in Nano TiO2 surface, the graft rate 21.42% . The sedimentation experiment shows that the KH-570 modified nano-TiO2 than unmodified nano-TiO2 dispersion effect in polyurethane paint thinner is better. - Breaking transfer radical polymerization by reversible addition of nano-TiO2 modified synthetic TiO2-g-PMMA-b-PS, your FT-IR, TG, and 1H NMR tests to prove the experiment is successful synthesis of RAFT agent and successfully led the RAFT polymerization, PMMA-b-PS in the nano-TiO2 surface of the graft was 80.5%. The rutile TiO2 corrosion resistance of polyurethane varnish added to polyurethane varnish KH-570 modified front and rear of rutile nano-TiO2 preparation of nano-TiO2 / polyurethane coating. Viscosity test results show that, add the modified nano-TiO2 coatings thixotropic, conducive to the paint store and construction; field emission electron microscope test results show that the modified nano-TiO2 was 3% of the most evenly dispersed in the polyurethane coating, The particle size of about 60 nm. Nano-TiO2 / polyurethane coating 56 d salt water immersion test (wt% = 5) and 2880 h electrochemical impedance test. The test results show that the addition of modified nano-TiO2 can significantly improve the corrosion resistance of the coating, add 3% modified nano-TiO2 coating the best corrosion resistance. After 56 d of salt water immersion, the pencil hardness of the pencil hardness of the coating varnish three levels higher gloss retention rate is 14% higher than the varnish, the impact resistance is 6 times the varnish adhesion down to 3 from a adhesion of the varnish fell from 0 to 4. Electrochemical impedance test for 2 h, the coating resistance reached 1011Ω.cm2, soaked to 2880 h, add nanometer TiO2 coating resistance was significantly higher than the unmodified nano-TiO2 coating of varnish and add the resistance, which modified nano-TiO2 coating resistance was 3% for 2.6 × 108Ω.cm2, varnish resistance 160 times, and the varnish the impedance spectrum presented two time constants characteristic modified nano-TiO2 add The impedance spectra for the 3% of the coating still showed the characteristics of a time constant. Rutile and anatase composite nano-TiO2 composite nano-TiO2 on the corrosion resistance of polyurethane finish graft modified by the KH-570 added to the polyurethane finish, preparation of composite coatings. The field emission electron microscope test results show that the nano-TiO2 was 4% polyurethane dispersed evenly distributed the worse with the increase of the added amount. Immersion test and 1680 h electrochemical impedance test the composite coating brine (wt% = 5). The results show that: add 4% composite nanometer TiO2 coating corrosion resistance is relatively the best. Immersion to 56 d, the pencil hardness than the original formulation 3, flexibility, improved 10 mm compared with the original formulation, improved adhesion than the original formulation 2. Beginning to soak in the electrochemical impedance test, the coating resistance difference is small. Soaked to 1680 h amount to 4% of the coating resistance, which is 100 times the original recipe coating resistance still has a protective effect on the base metal.

Related Dissertations

  1. Research on Electrochemical Synthesis and Application of Conductive Polyaniline,O633.21
  2. Modification of SEBS Rubber Via Living Radical Polymerization,TQ330.6
  3. Electroless Ni-Pon the Bulk Nanocrystalline Ingot Iron,TQ153.1
  4. Study on Corrosion Resistance and Condensation Property of Ni-P/Nano SiO2 Composite Coatings,TG174.4
  5. Preparation, Characterization and Performance of the Bio-coatings on the Surface of Pure Titanium Based on Micro Arc Oxidation,R318.08
  6. Pulse Nanocomposite Coatings Preparation and Properties,TQ153
  7. Magnesium alloys and corrosion resistance of phosphating process,TG174.4
  8. Vacuum casting AZ91 Magnesium Alloy Corrosion Resistance,TG146.22
  9. Carbon steel liquid plasma electrolytic carbonitriding research,TG156.8
  10. ZA35 alloy elements Zr on Microstructure and Properties,TG131
  11. Modified polypropylene microcellular foam morphology and Control Research,TQ328
  12. Medical magnesium alloy surface laser cladding Zr 60 Ti 6 Cu 19 Fe 5 Al 10 amorphous coating,TG174.44
  13. Submarine hydrothermal organisms Sampler key technology research,TH766
  14. The Study on Red Soil Corrosion by the Technological Direct, Continuous Monitoring,X53
  15. Nano- TiO_2 composite photocatalytic oxidation of elemental mercury removal experimental study,X51
  16. An Approach to Study the Protective Performance of Nano ZnO, TiO2 Modified Bamboo,TS652
  17. Cutting silicon brass performance study,TG146.11
  18. Electronic shell material magnesium alloy micro-arc oxidation and subsequent treatment process research,TG174
  19. Study on the Ni-nWC Nano-Composite Coating by Electroplating,TG174.4
  20. Organizations and alloying elements on the corrosion resistance of high-performance steel for railway vehicles,TG142.13
  21. Study of the Effect of Aluminum Powders Activant on Mechanically Deposited Process of Zinc-aluminum Alloy,TG174.44

CLC: > Industrial Technology > General industrial technology > Materials science and engineering > Special structural materials
© 2012 www.DissertationTopic.Net  Mobile