| abstract |
The invention discloses a preparation method and application of a nano-silica modified fluoride-free cationic polyacrylate waterproof agent, wherein the preparation method comprises the following steps: (a) weighing raw materials; stirring and dissolving the mixed monomer, the emulsifier and the deionized water, and ultrasonically stirring to form a monomer pre-emulsion; (b) adding 1/3 parts of monomer pre-emulsion into a reaction kettle, introducing nitrogen, adding 1/3 parts of initiator aqueous solution, heating for reaction, and then dropwise adding the rest 2/3 parts of monomer pre-emulsion and initiator aqueous solution; (c) and (3) after the dropwise addition, adding a silane coupling agent, cooling after reaction, adding tetraethoxysilane, reacting, cooling to room temperature, and discharging. The fluorine-free polyacrylate waterproof agent prepared by the invention has high solid content, small particle size, uniformity and stability, and can endow the fabric with excellent super-hydrophobicity, antibacterial property, durability and other properties. |