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Synthesis and Modification of Waterborne Polyurethane Based on Dimer-fatty-acid Polyester Polyol
Author: ZhangPeng
Tutor: ZhangXingYuan
School: University of Science and Technology of China
Course: Polymer Chemistry and Physics
Keywords: Dimer acid polyester diol Waterborne Polyurethane Drying rate Mechanical strength UV-curable
CLC: TQ323.8
Type: Master's thesis
Year: 2010
Downloads: 263
Quote: 1
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Abstract
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Dimer acid polyester diol (PDFA) can be imparted to the polyurethane material is excellent in chemical resistance and adhesion to low surface energy surface of the substrate, but the use of the synthesis aqueous polyurethane is usually difficult to obtain a stable emulsion and excellent mechanical properties. Aqueous ultraviolet (UV) curing the technical safety and environmental protection and to improve product performance, but there are still consuming energy issues addition to water before drying curing stage. PDFA waterborne UV curing technology advantages, the use of a dimer acid polyester diol synthesized excellent storage stability and rapid drying rate of the aqueous polyurethane emulsion, and doped by polycaprolactone diol (PCL) and the aqueous UV curing technology be modified. 1. Excellent in storage stability of the dimer acid polyester diol aqueous polyurethane the (pdfa PU) emulsion was synthesized using a dimer acid polyester diol, and with ordinary polyol synthesis aqueous polyurethane emulsion performance, rate of drying, hydrolysis resistance and thermal performance comparison. The results show that the drying rate of the soft segment polyurethane emulsion is arranged in the following order: the PDFA-PU gt; PTMG-PU gt; PCL-PU gt; PPG-PU. Fastest drying rate of the PDFA-PU emulsion, the emulsion dry film can effectively shorten the time; hard segment content in the system is relatively higher the the emulsion drying rate is also faster. The PDFA-PU hydrolysis resistance was significantly better than the other samples, and significant hard and soft segment glass transition, serious degree of micro-phase separation. 2. Using the PCL the doping modification PDFA-PU, and the modified polyurethane material, hydrolysis resistance, mechanical strength and thermal performance. The results showed that: when the PDFA with PCL system in a 1:1 molar ratio, the mechanical strength of the material increased from 9.97MPa to 15.62MPa; soft segment glass transition temperature increase of 11 ° C, the degree of micro-phase separation is significantly reduced; hydrolysis resistance decline. The synthesized double bond content and drying rate the PDFA base can UV curable waterborne polyurethane emulsion and modified cross-linked by UV irradiation of their film. Reaction stages are followed a second-order kinetic reaction mechanism, the second and third stages of the reaction rate constant was significantly higher than that of the first stage; the higher the double bond content of the system, the faster the rate of double bond reaction, and ultimately the conversion rate is also higher; up to 90.23%, significantly higher than the the ordinary polyester polyether UV curing polyurethane. The PDFA based polyurethane tensile strength after curing by UV irradiation by 9.97MPa increased to 23.3MPa, and up to 37MPa; system a soft segment glass transition temperature increase of 8 ° C, the hard segment glass transition temperature increase of 6 ° C, thermal The stability can be increased to 50 ° C. Through these studies, we can get a superior overall performance of dimer acid polyester glycol-based waterborne polyurethane material, dry film stage and at the same time reduce the time-consuming energy consumption, improve the efficiency of the construction of the water-based UV curing technology, widely used in industrial production.
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CLC: > Industrial Technology > Chemical Industry > Synthetic resins and plastics industry > Polycondensation resin and plastic > Polyurethane (poly carbamate ) and plastic
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