Water-based polyurethane formulations for robust superhydrophobic fabrics

被引:66
作者
Huang, Shuaishuai [1 ]
Liu, Guojun [1 ]
Zhang, Kaka [1 ]
Hu, Heng [1 ]
Wang, Jian [1 ]
Miao, Lei [1 ,2 ]
Tabrizizadeh, Tina [1 ]
机构
[1] Queens Univ, Dept Chem, 90 Bader Lane, Kingston, ON K7L 3N6, Canada
[2] Foshan Univ, Sch Mat Sci & Energy Engn, Foshan 528000, Guangdong, Peoples R China
基金
加拿大自然科学与工程研究理事会;
关键词
Waterborne coatings; Polyurethanes; Micelles; Superhydrophobic fabric; COTTON FABRICS; FLUORINE-FREE; OIL/WATER SEPARATION; MECHANICAL STABILITY; CARBOXYLIC-ACIDS; GRAFT-COPOLYMER; CATALYST SYSTEM; STRATEGY; COATINGS; DURABILITY;
D O I
10.1016/j.cej.2018.11.220
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Free radical copolymerization of acrylic acid (AA), 2-hydroxyethyl acrylate (HEA), and mono-methacryloxypropyl terminated poly(dimethyl siloxane) (PDMS-MA) yielded graft (g) copolymers P(AA-HEA)-gPDMS. The molecular weights of the three used PDMS-MA macromers were 0.7, 5.0, and 10.0 kDa, respectively, and the respective weight fractions of AA, HEA, and PDMS-MA in the three synthesized copolymers were 10.0, 20.0, and 70.0 wt%. The copolymers were dispersed in water as micelles due to the water-soluble HEA units and salt formation from the AA groups with added triethylamine. Mixing these aqueous copolymer micellar solutions with a water-soluble blocked tetraisocyanate yielded water-based polyurethane (PU) formulations. Soaking fabric samples in such a water-based formulation and then withdrawing, drying, and heating the samples at 150 or 180 degrees C produced on the fabric fibers a crosslinked coating that was similar to 220 nm thick and surface-enriched with PDMS. A systematic study was performed to investigate factors affecting the hydrophobicity of the coated fabric samples. These factors included varying the concentration of the aqueous P(AA-HEA)-g-PDMS coating solutions, the molar ratio of isocyanate groups to the AA and HEA groups, the coating curing times at 150 degrees C, and the molecular weight of the PDMS side chains. This study further established that the coatings could be cured in 7 min at 180 degrees C and fabric samples coated by P(AA-HEA)-g-PDMS10k with PDMS molecular weight at 10.0 kDa were the most hydrophobic. The coatings were stable against real laundry tests, abrasion by sandpaper, and soaking in aqueous acid and base solutions. Thus, robust superhydrophobic fabrics were obtained from using a water-based environmentally friendly formulation and this coating process was convenient, rapid, and practical.
引用
收藏
页码:445 / 451
页数:7
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