Water repellent agent, preparation method and sizing agent

The invention discloses a water-resistant agent, a preparation method and a sizing agent, relates to the technical field of water-resistant materials, and aims to solve the problem that in the prior art, water resistance needs to be further improved when cationic dispersed rosin size is used for papermaking sizing. The preparation method comprises the following steps: modifying rosin to obtain modified rosin, carrying out oxidative degradation on cationic starch to obtain degraded starch, mixing the modified rosin with a silicon-containing monomer mixture under the action of an initiator by taking the degraded starch as a dispersing agent, and carrying out a grafting reaction by adopting a suspension polymerization method to obtain the water repellent agent. According to the water-resistant agent, the preparation method and the sizing agent provided by the invention, the water resistance of rosin serving as the papermaking sizing agent can be improved, and paper is endowed with hydrophobicity. 本发明公开一种抗水剂及制备方法