| abstract |
The invention provides a preparation method of a polyurethane acrylic composite type fluorine-free water repellent, which comprises the following steps: (i) mixing 5.0 to 20.0 parts by weight of wax, 5.0 to 10.0 parts by weight of unsaturated monomer, 3.0 to 6.0 parts by weight of a solvent, 60.0 to 75.0 parts by weight of water, and 1.0 to 4.0 parts by weight of an emulsifier; (ii) adding 0.1 to 0.5 parts by weight of an initiator to the mixture in step (i), and conducting a polymerization reaction to Obtain a first water-repellent agent; (iii) take 1.0 to 99.0 parts by weight of the aqueous polyurethane intermediate, mix with 1.0 to 99.0 parts by weight of the first water-repellent agent of step (ii); and (iv) add 0.1 To 0.5 parts by weight of the initiator, the water-based polyurethane intermediate and the first water-repellent agent are polymerized to obtain the polyurethane-acrylic composite type fluorine-free water-repellent agent. |