Rosin phenolic resin with high flowability for printing ink and preparation method of rosin phenolic resin

The invention discloses a preparation method of high-fluidity rosin phenolic resin for printing ink, which comprises the following steps: adding glycerol into a reaction kettle, and then adding rosin, magnesium oxide and soybean oil into the reaction kettle; raising the temperature in the reaction kettle to 165 DEG C, and stirring for 10 hours at the speed of 45r/min; adding octyl phenol into the reaction kettle, and reducing the temperature in the reaction kettle to 110 DEG C; adding a modified defoaming agent, then adding paraformaldehyde, adjusting the temperature in the reaction kettle to 112 DEG C, introducing nitrogen into the reaction kettle at the same time, and keeping the temperature for 5 hours; adding a modified defoaming agent into the reaction kettle, then increasing the temperature in the reaction kettle to 250 DEG C at the speed of 13.8 DEG C/h, and keeping the temperature for 6 hours; according to the preparation method, the reaction kettle is vacuumized, and then nitrogen is filled to restor