	US 11,945,957 B2
	Aqueous composition and a method of producing durable and extremely efficient water repelling superhydrophobic materials at ambient condition thereof
Pradeep Thalappil, Chennai (IN); Avijit Baidya, Chennai (IN); Mohd. Azhardin Ganayee, Chennai (IN); and Jakka Ravindran Swathy, Chennai (IN)
Assigned to INDIAN INSTITUTE OF TECHNOLOGY MADRAS (IIT MADRAS), Chennai (IN)
Filed by INDIAN INSTITUTE OF TECHNOLOGY MADRAS, Chennai (IN)
Filed on Feb. 8, 2022, as Appl. No. 17/667,196.
Application 17/667,196 is a division of application No. 16/163,325, filed on Oct. 17, 2018, granted, now 11,242,468.
Claims priority of application No. 201741036772 (IN), filed on Oct. 17, 2017.
Prior Publication US 2022/0162469 A1, May 26, 2022
Int. Cl. C09D 101/00 (2006.01); C08B 15/05 (2006.01); C08B 15/06 (2006.01); C09D 5/16 (2006.01); C09D 7/61 (2018.01); C09D 7/63 (2018.01); C09D 101/02 (2006.01); C09D 101/08 (2006.01); C08K 3/34 (2006.01); C08K 9/06 (2006.01)

CPC C09D 101/02 (2013.01) [C08B 15/05 (2013.01); C08B 15/06 (2013.01); C09D 5/1681 (2013.01); C09D 7/61 (2018.01); C09D 7/63 (2018.01); C09D 101/08 (2013.01); C08K 3/346 (2013.01); C08K 9/06 (2013.01)]

10 Claims

1. A water based fabrication method of forming an amino silane functionalized superhydrophobic coating composition wherein said method includes chemical modification and functionalization of cellulose nanofiber by a wet chemical process in an aqueous medium free of any organic solvent, said method comprising the steps of:

a. dispersing a hydrophilic cellulose nanofiber in an aqueous medium to obtain a dispersed hydrophilic cellulose nanofiber in an aqueous medium,

b. mixing the dispersed hydrophilic cellulose nanofiber in an aqueous medium with 1H,1H,2H,2H-perfluorooctyltriethoxysilane and 3-(2-aminoethylamino)propyltrimethoxysilane, and

c. Vigorous stirring for 6-7 hours,

wherein the steps are performed under room temperature and ambient conditions.