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US 11,118,018 B2Granted
Stable waterborne polyurethane/clay nanocomposite
AssigneeKing Fahd University of Petroleum and Minerals
InventorsMohammad Mizanur Rahman, Ahmad Sorour
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Abstract
A method of preparing stable waterborne polyurethane nanocomposite with a long shelf-life time is described. The stability of the nanocomposite is achieved by effective mechanical and sonication mixing of diisocynate and clay. Also, the stability is achieved through optimization of the amount of clay and carboxylic acid with hydroxyl functionality.
Claims8
A method for preparing a waterborne nanocomposite dispersion, comprising:
- mixing a diisocyanate and an organoclay to form a first mixture;
- mixing a polyol, a carboxylic acid having hydroxyl functionality and a solvent to form a second mixture;
- mixing the first mixture with the second mixture and heating at a temperature in a range of 40-90° C. for 2-6 hours to form a prepolymer with a carboxylic acid group;
- mixing a base with the prepolymer with a carboxylic acid group to form a prepolymer with a carboxylic acid salt;
- mixing water with the prepolymer with a carboxylic acid salt to form a dispersion;
- and
- reacting the dispersion with a diamine as a chain extender to form the waterborne nanocomposite dispersion.
4 more elements
Dependencies are inferred from the claim text.