Dissertation > Excellent graduate degree dissertation topics show

A New Technology for Removing Trace Water from Polyether Component and Its Application in RIM-PUE

Author: ZhengZhi
Tutor: SongWenSheng
School: Henan University of Science and Technology
Course: Polymer Chemistry and Physics
Keywords: Polyurethane elastomer Water Ethylene glycol antimony Preparation Performance
CLC: TQ334.1
Type: Master's thesis
Year: 2009
Downloads: 27
Quote: 0
Read: Download Dissertation

Abstract


Performance polyurethane RIM elastomer (RIM-PUE), has been widely used in the automotive and other fields. In the RIM-PUE preparation, the moisture on the products performance a great impact, thus reducing the moisture content in the polyether component is the key to producing high-performance RIM-PUE. Glycol antimony is a metal organic compounds, water is generated antimony oxide and ethylene glycol (EG), antimony oxide the RIM-PUE material has enhanced and flame retardant role, EG is the expansion the RIM-PUE material preparation chain extender. Therefore, this system glycol antimony glycol antimony addition to the effect of water and grain refinement RIM-PUE. This article uses the high performance sanding dispersing machine, the combination of polyether glycol antimony refinement explore glycol antimony particle size and its combination of polyether settlement characteristics, the effects of temperature on containing ethylene glycol combination of polyether viscosity effects of antimony, and systematically study the glycol dehydration effect of antimony in the different systems. On the basis of the above experiments, the high activity polyether, liquefied MDI, EG and amine of the tin complex catalyst as main raw materials, the preparation of polyurethane RIM elastomers investigated different particle glycol antimony in the catalytic activity of the system of the RIM-PUE explore glycol antimony content, process conditions on the RIM-PUE process, properties and microstructure. The experimental results show that: (1) With the time extension polyether containing ethylene glycol antimony combination sanding dispersed, ethylene glycol antimony particle size became smaller, refined glycol antimony settlement by the combination of polyether more and more obvious, dispersed almost no settlement to 20min, 48h, ethylene glycol antimony particle size of about 200 nm. Meanwhile, with the extension of the sand dispersion time, the viscosity of the composition polyether increased rapidly. (2) the influence of temperature on the antimony viscosity of the combined polyether containing ethylene glycol is very clear, as the temperature increases, the viscosity is drastically reduced, polyether viscosity of about 600 mPa · s at 60 ℃ combination with room temperature liquefied MDI viscosity considerable. (3) glycol antimony combination of polyether, pure polyether system can play a good addition to the effect of water, but the combination of polyether dehydration rate faster; glycol antimony and water reaction order n = The activation energy Ea = 22.12 kJ / mol, the Arrhenius equation lg Kc = 6.0415-1155.93 / T. (4) the grain refiner After ethylene glycol antimony RIM-PUE system have a better catalytic effect, the performance of the same of the antimony content of ethylene glycol, the cream time of the polymerization system, the gel time with the ethylene glycol antimony diameter decrease and shortened; increased antimony content of ethylene glycol, the cream time and gel time of the polymerization system can be significantly shortened, RIM-PUE density of the material, the hardness increased slightly, while the tensile strength and elongation at break is significantly increased. (5) with ethylene glycol antimony combined polyether mixing time is extended and the combined polyether temperature rises, the cream time and gel time of the polymerization system is gradually shortened, the slow increase of the hardness of the material, density, tensile strength and fracture the elongation significantly improve. (6), scanning electron microscopy (SEM) analysis showed that glycol antimony RIM-PUE dispersed more evenly, less agglomeration; X-ray diffraction (XRD) analysis showed that the crystallization of antimony, the the RIM-PUE material glycol characteristics have not exist, ethylene glycol antimony particles uniformly dispersed in the material matrix, and there is no aggregation phenomenon; thermogravimetric (TG) analysis shows that the ethylene glycol antimony added can improve the heat resistance of the material of the RIM-PUE.

Related Dissertations

  1. Empirical Study on the Top Management Turnover and Performance of Listed Companies in China,F224
  2. Preparation and Performance of Molecular Imprinted Polymers for Rhodamine-B and Rhodamine-6G,O631.3
  3. Powered Activited Carbon-UF for Treating Micro-polluted Surface Water,X703
  4. Temporal and Spatial Variation of Methane Emission from Urban Lake and Its Relationship with the Hydrology-water Quality,X524
  5. The Brake Performance of Hydraulic Retarder and Simualtion Research on Its Application for Aircraft Arrestment,TH137.331
  6. Numerical Study of the Effect with Straight and Bowed Stator in Different Axial Gaps,TH45
  7. Effectiveness Evaluation on the Jointed Combat of the Multiple Missiles and Research on Combinatorial Optimization Algorithm,TJ760.1
  8. The Research of Steel’s Representation in Architecture,TU-0
  9. Partical Combination of Fine Powder Effect on Performance of Cement and Concrete,TU528.041
  10. Experimental Research on the Influence of Hollow Cathode to a Hall Thruster,V439.2
  11. Preparation and Properties of Silicon Carbon Anode for Lithium Ion Battery,TM912.9
  12. Hardware Implementation of LEO Satellite Channel Characteristic Emulation,TN927.23
  13. Development of Pxibus High Performance Digital I/O Module,TP274
  14. The Research on the Performance Results Application of Zhaoqing Power Supply Bureau,F272.92
  15. The Research of Ecological Compensation on the Restoration of Water Quantity in the Man-Made Seasonal Rivers,X143
  16. Phosphorus pentoxide composite ammoniated condensing agent preparation of ammonium polyphosphate,TQ314.248
  17. Studies on the Drying Modle and Technology of Tilapia by Heat Pump,TS254.4
  18. Clinical study of Xu heart,such as academic thought and clinical experience and Yiqi Huoxue,Xiefei Diuresis treatment,congestive heart failure,R259
  19. Capsaicin / β - cyclodextrin system to dissolve and penetrate the,R943
  20. The Preparation and Properties of Reed Woodceramic,TQ174.1
  21. Effects of Intensitive Cycling of Papermaking Water on Sizing and Its Improvement,TS727.5

CLC: > Industrial Technology > Chemical Industry > Rubber Industry > Thermoplastic elastomers > Polyester elastomer
© 2012 www.DissertationTopic.Net  Mobile