Dissertation > Excellent graduate degree dissertation topics show

Research on Properties of Polyurea and Its Matched Coating Applied on Outdoor Swimming Pool

Author: HuXiao
Tutor: LvPing
School: Qingdao Technological University
Course: Materials Science
Keywords: Polyurea coatings Outdoor swimming pool protection Ageingresistance Corrosion resistance Matched top coating for polyurea
CLC: TQ630.7
Type: Master's thesis
Year: 2013
Downloads: 4
Quote: 0
Read: Download Dissertation

Abstract


The waterproof layer in outdoor swimming pool always bears the mediumcorrosion and the sunlight irradiation, so it is easy to crack and peel, which willresults in the leakage, a major problem in outdoor swimming pools’ operation andmaintenance. And there is still no systematic study for waterproof materials andtechnologies aimed at this problem at home and abroad. So This paper, on the basisof characteristics of outdoor swimming pool environment, to provide basic datesupport for outdoor swimming pool protection, selected polyurea coating as theprotective material; conducted a series of tests to study the water resistance andcorrosion resistance of polyurea and to analyze the correlation between the naturaloutdoor exposure method and the artificial accelerated aging method; and thenscreened the most suitable top coating for polyurea applied to outdoor swimming poolprotection and studied the corrosion resistance of the selected coating. Theexperimental conclusions are as follows:(1) The study on medium resistance of polyurea indicated: polyurea have agood resistance to0.2~1.4mg/L swimming pool water and1.4mg/L NaClO solution,and in indoor and outdoor environment, the retention rates of tensile strengths ofpolyurea in the180th day were90.11~94.94%and the elongations increased by2.96~9.70%;6.0g/L NaClO solution have large effects on the tensile property ofpolyurea, and in indoor and outdoor environment, the retention rates of tensilestrengths of that immersed polyurea in the180th day respectively are77.38%,67.40%and their elongations reduced by5.10%,10.12%. The SEM and FTIR results aboutpolyurea samples immersed in6.0g/L NaClO solution for180days showed that thepolyurea coatings were corroded, and the C-O-C and C=O were broken.(2) The light aging resistance study of polyurea showed: the light loss rates ofsamples in the natural outdoor exposure and artificial accelerated aging environmentwere over80%respectively in the300th day and120th day; in that two kind ofabove-mentioned aging environments, the tensile strengths, behaving decreasing, reduced by23.70%and11.10%respectively, and the retention rates of elongations ofsamples in above environment were89.05%and96.34%, and the loss of the thicknesswere0.116mm and0.07mm. The SEM and FTIR test indicated that in the twoenvironments above, the surfaces of the samples littered with cracks and holes, but theinterior structure just had little change, and the outdoor exposure and artificialaccelerated aging samples’ molecular chain fracture mechanism is the break of C=O,C-H and N-H. The correlation study of the natural outdoor exposure and the artificialaccelerated aging showed that, the relationship between the two aging methods can’tbe described with simple transformation relation, and their aging results and agingdegree related to the test conditions.(3) The matched top coating of outdoor swimming pool engineering protectivepolyurea optimization and properties research showed: the surface drying time andhard drying time of the aliphatic polyurethane coating C-2are45min,6h, and thiscoating has the best comprehensive characteristics include good smooth andglossiness, great suppleness and adhesiveness and outstanding light aging resistance.The immersion tests of this top coating samples in NaClO solution showed, in theprocess of immersion the top coating turned yellow but its flexibility and adhesionwere still good; the SEM and FTIR tests showed that in the surface of the immersedtop coating were cracks, and C-H and C=O in the top coating broke.Based on above studies, the property change rules and the aging mechanism ofpolyurea and its matched top coating applied in the outdoor swimming poolenvironment were obtained, which will provides basic data and theoretical support forpolyurea’s application in outdoor swimming pool protection and further modificationresearch of polyurea.

Related Dissertations

  1. Research on Electrochemical Synthesis and Application of Conductive Polyaniline,O633.21
  2. Investigate of Chromate Conversion Coatings on Aluminum Alloy,TG174.4
  3. Surface Modification of Al-alloy for Improving Bonding Strength with Pps and the Corrosion Resistance of Al-alloy,TG174.4
  4. Study of the Preparation and Properties of the Trivalent Chromium Black Passivation with Non-cobalt Sulfate System,TG174.4
  5. Study on Chemical Coloring and Sealing Processing of Stainless Steel,TG177
  6. Preparation and Properties of Reactive Thermal Sprayed Ternary Boride Cermet Coatings,TG174.4
  7. Study on Preparation Technology and Properties of Al2O3-TiB2 Solid-state Reaction Multiphase Ceramic Coating on AZ31B Alloy,TG174.44
  8. Prepaation of Hybrid Membrane on Carbon Steel and Anti-corrosion Properties Research,TG174.4
  9. The Comparative Study on Ni-P and Ni-Ce/W-P Electroless Plating and Coating Performance on 27SiMn Steel,TQ153.12
  10. Electroless Ni-Pon the Bulk Nanocrystalline Ingot Iron,TQ153.1
  11. Study on Corrosion Resistance and Condensation Property of Ni-P/Nano SiO2 Composite Coatings,TG174.4
  12. Studies on Hard Films of Stainless Steel by Magnetron Sputtering,TG174.44
  13. Study on Amorphous Formation Ability and Performance of Pt-Pd-Cu-P Alloys,TG139.8
  14. Research of Microstructure, Properties and Rare Earth Modification of Hot-dipped Aluminum on Carbon Steel,TG174.4
  15. Study of Corosion Behavior of Magnesium Alloys in Commercial Engine Coolant,TG172
  16. Study on the Corrosion Resistance in Moltenzinc of Plasma-Sprayed Coating of Internal Heating Tube,TG174.44
  17. The Influence of Addtivies on the Corrosion Resistance of Anodic Aluminum Oxieds Films,TG174.44
  18. The Study of AlCoCrTiNiCu_x High Entropy Alloy for the Microstructure and Properties,TG132.3
  19. Preparation, Characterization and Performance of the Bio-coatings on the Surface of Pure Titanium Based on Micro Arc Oxidation,R318.08
  20. Carbon steel liquid plasma electrolytic carbonitriding research,TG156.8
  21. ZA35 alloy elements Zr on Microstructure and Properties,TG131

CLC: > Industrial Technology > Chemical Industry > Paint Industry > General issues > Coating products
© 2012 www.DissertationTopic.Net  Mobile