Method of preparing bio-based waterborne polyurethane intermediate, bio-polyurethane-acrylic hybrid fluorine-free water repellent and the application thereof

Abstract

The present disclosure provides a method of preparing a bio-based waterborne polyurethane intermediate. The method comprises the following steps:(a) mixing bio-based isocyanate polymer, sorbitol, fatty acid-substituted glycolipid copolymer, dihydroxyl-terminated polydialkylsiloxane, and a solvent; (b) adding a first initiator to a mixture of step (a) to carry out polymerization; and (c) adding water, an emulsifier, and acetic acid to the product of step (b) to form the bio-based waterborne polyurethane intermediate. The present disclosure also provides a method of preparing a bio-based polyurethane-acrylic hybrid fluorine-free water repellent. The bio-based polyurethane-acrylic hybrid fluorine-free water repellent is derived from aforesaid bio-based waterborne polyurethane intermediate and an acrylic-based fluorine-free water repellent.

Dependencies are inferred from the claim text.