Rosin polycondensate air-entraining agent and application thereof

The present invention relates to an air-entraining agent polycondensate rosin and its application. The air-entraining agent obtained by the production method comprising the steps made: 1) After heating the lignin or gum rosin and melt mixed, isomerization to obtain the isomerized product A; 2) maleic anhydride or maleic anhydride and concentrated sulfuric acid, the polycondensation to prepare a synthetic resin B; 3) polyethylene glycol, further addition of glycerol and / or concentrated sulfuric acid, to give a graft esterification esterification product C; 4) foam stabilizing components added, the reaction incubated ; 5) cooling, lye, controlling pH = 8 ~ 13, heat the reaction, the dropwise addition of water, the solid content of 30 ± 1%, to prepare rosin polycondensate air-entraining agent. Air entraining agent of the present invention is provided with good solubility in water can, air-entraining property and bubble retention performance for a variety of concrete or mortar workers, public buildings, roads, railways, bridges, tunnels or hydraulic engineering, especially for rolling low slump concrete, special concrete mixed with fly ash.