Preparation and characterization of modified castor oil via photo‐click chemistry for UV ‐curable waterborne polyurethane with enhanced water resistance and low conductive percolation threshold

2020 ◽  
Vol 138 (9) ◽  
pp. 49913
Author(s):  
Mengwei Dai ◽  
Pan Song ◽  
Yong Zhang
Keyword(s):  
Percolation Threshold ◽  
Click Chemistry ◽  
Castor Oil ◽  
Water Resistance ◽  
Waterborne Polyurethane ◽  
Uv Curable

Preparation and characterization of UV-curable waterborne polyurethane using isobornyl acrylate modified via copolymerization

2021 ◽  
Vol 184 ◽  
pp. 109474
Author(s):  
Fuhao Dong ◽  
Yuehan Qian ◽  
Xu Xu ◽  
Hiba Shaghaleh ◽  
Lizhen Guo ◽  
...  
Keyword(s):  
Waterborne Polyurethane ◽  
Uv Curable

Synthesis and characterization of non-ionic and anionic two-component aromatic waterborne polyurethane

2018 ◽  
Vol 47 (4) ◽  
pp. 290-299 ◽  
Author(s):  
Sainan Zhang ◽  
Xiankai Jiang
Keyword(s):  
Thermal Stability ◽  
Water Resistance ◽  
Soft Segment ◽  
Aqueous Dispersion ◽  
Waterborne Polyurethane ◽  
Content Type ◽  
Hydrophilic Modification ◽  
Two Component ◽  
Better Than

Purpose The purpose of this paper is to synthesize and characterize a series of two-component aromatic waterborne polyurethane (2K-WPU) which is composed of non-ionic and anionic polyisocyanate aqueous dispersion and polyurethane polyol aqueous dispersion. Design/methodology/approach The polyisocyanate aqueous dispersion was synthesized through non-ionic and anionic hydrophilic modification procedures. The values of the hydrogen bonding index (HBI) and molecule structures of WPU were obtained by Fourier transform infrared (FTIR). The thermal, mechanical and water resistance properties of 2K-WPU films were investigated. Findings The appearance of non-ionic polyisocyanate aqueous dispersion and anionic polyisocyanate aqueous dispersion was colorless translucent pan blue and yellow opaque emulsions, respectively. FTIR not only showed that 2K-WPU was obtained from the polymerization of polyisocyanate component and polyhydroxy component by polymerization but also showed that the content of hydrogen bondings of anionic 2K-WPU (WPU 2) was higher than non-ionic 2K-WPU (WPU 1). The glass-transition temperature (Tg), storage modulus and water resistance of WPU 2 were higher than WPU1, whereas the thermal stability of WPU1 was better than WPU 2. Practical implications The investigation established a method to prepare a series of 2K-WPU which was composed of non-ionic or anionic polyisocyanate aqueous dispersion and polyurethane polyol aqueous dispersion. The prepared 2K-WPU film could be applied as substrate resin material in the field of waterborne coating. Originality/value The paper established a method to synthesize a series of 2K-WPU. The effect of HBI value and the molecule structure of soft segment on the thermal stability, mechanical and water resistance properties of 2K-WPU films were studied.

Synthesis and Characterization of a Novel Waterborne Polyurethane Modified by Tung Oil

2014 ◽  
Vol 513-517 ◽  
pp. 251-254 ◽  
Author(s):  
Zheng Xiang Wang ◽  
Ji Tong Yuan ◽  
Qi Long Liu ◽  
Xi Mei Xiao ◽  
Yun Hua Li ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Water Resistance ◽  
Waterborne Polyurethane ◽  
Synthesis And Characterization ◽  
Good Adherence ◽  
Water Contact ◽  
Tung Oil ◽  
Low Surface Energy ◽  
Ft Ir

A novel waterborne polyurethane (WPU) modified by tung oil was prepared with 2,4-tolylene diisocyanate, polyethylene glycol, dimethylol propinic acid, 1,4-butanedilo as main materials via acetone process. The structure of WPU molecule was characterized by FT-IR. Adhesive behavior for non-polar and/or low surface energy soft packing films was studied. Water resistance of films were evaluated by water contact angle and water uptake and thermal properties determined by thermal analysis instruments. The results show that the modified WPU films have good water and heat resistance. Both of modified WPUs or not have good adherence on BOPP films.

Water resistance of the membranes for UV curable waterborne polyurethane dispersions

2007 ◽  
Vol 59 (4) ◽  
pp. 331-336 ◽  
Author(s):  
Chen Yan Bai ◽  
Xing Yuan Zhang ◽  
Jia Bing Dai ◽  
Chu Yin Zhang
Keyword(s):  
Water Resistance ◽  
Waterborne Polyurethane ◽  
Uv Curable ◽  
Polyurethane Dispersions

Preparation of UV Curable Waterborne Polyurethane and its Application in Coatings

2013 ◽  
Vol 821-822 ◽  
pp. 925-928
Author(s):  
Lei Wang ◽  
Xiao Juan Lai ◽  
Shao Yun Ma
Keyword(s):  
Electron Microscopy ◽  
Water Resistance ◽  
Waterborne Polyurethane ◽  
Water Soluble ◽  
Cross Linking ◽  
Crosslinking Degree ◽  
Uv Curable ◽  
Transmission Electron ◽  
Solidification Reaction ◽  
Test Result

Waterborne UV curable polyurethane emulision containing C=C bond was prepared with self-emulsification. 3% water soluble photoinitiator was added to the polyurethane emulision, and polyurethane films was prepared by ultraviolet irradiation. The structure of the polyurethane emulision and films were confirmed by means of Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM) and thermogravimetric analysis. FTIR test result shows that cross linking and solidification reaction of C=C double bond happened after UV irradiation. When C=C content increases, the particle size of polyurethane emulision increases, crosslinking degree of films increases, water resistance and heat resistance have both been improved. When C=C content is 8.51%, gel content is more than 90% and the lowest water absorption can be 12.5%.

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