Study on the Modification of Waterborne Polyurethane by Tung Oil Anhydride-Ester Polyol

2015 ◽  
Vol 1088 ◽  
pp. 460-466 ◽  
Author(s):  
Jin Hua Zhou ◽  
Jing Yang ◽  
Wen Jie Ma ◽  
Ni Li ◽  
Han Zhou Sun

Waterborne polyurethane (WPU) emulsions were prepared with Tung oil anhydride-ester polyol (TOAEP) as modifier via the acetone process. The structure, morphology, emulsion particle size, thermal property and mechanical property of the Modified WPU were investigated by FT-IR, SEM, Laser particle size analysis, TG and tensile test, respectively. The experimental results show that the modified WPU emulsion particle size increases along with the growth of weight content of TOAEP. Compared with the unmodified WPU emulsion film, water and toluene absorption of the modified WPU emulsion film have decreased significantly, indicating that water and solvent resistance are remarkably improved after the modification. Tensile test shows that the tensile strength of the modified WPU emulsion film increases with the content of TOAEP while the reverse is true for the elongation at break. The characteristic thermo-decomposition temperatures of WPU have been increased notably after modification by the introduction of TOAEP which indicates that the heat resistance has been improved after modification. Morphology analysis shows that the soft segment phase and hard segment phase in the WPU are more compatible after modification.

2015 ◽  
Vol 1090 ◽  
pp. 31-37
Author(s):  
Yi Ding Meng ◽  
Hong Wei Li

A series of stable double-terminated UV reactive cationic waterborne polyurethane dispersions was synthesized, while the structure was confirmed by infrared spectroscopy,laser particle size analysis and free NCO root titration; modified by co-monomerhydroxyethyl acrylate with the UV radiation fast curing, the influence of hydroxyethyl acrylate proportion and the polyurethane’s nNCO/nOH(R value) to the thermal properties, mechanical properties and yellowing of the product was investigated. The investigation illustrated the UV-curable cationic waterborne polyurethaneacrylate film effectively forming a semi-interpenetrating network system to achieve rapid curing coating.The results showedthe product cured by WPU dispersion of R=1.5 mixed with equimolar HEA obtained lowyellowing, the maximum breaking strength, high elongation at break, high thermal decomposition temperature, high crystallization temperature of hard segment, low glass transition temperature of soft segment, high degree of phase separation, better overall performance.


Circular ◽  
1985 ◽  
Author(s):  
Lawrence J. Poppe ◽  
A.H. Eliason ◽  
J.J. Fredericks

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