Modified styrene-butadiene latex binder and preparation method thereof

The invention relates to a modified styrene-butadiene latex binder and a preparation method thereof, and belongs to the technical field of styrene-butadiene latex binders. The modified styrene-butadiene latex binder comprises the following components: a functional monomer, acrylate, butadiene, methyl styrene, hydroxyethyl acrylate, terpolymer coated titanium dioxide, silicon dioxide, an emulsifier, an initiator and deionized water. According to the prepared terpolymer coated titanium dioxide, the dispersity and compatibility of titanium dioxide and silicon dioxide in a system are improved, epoxy groups of the terpolymer can react with carboxyl of styrene-butadiene latex and hydroxyl of silicon dioxide to form chemical bond connection, and in addition, the number of hydroxyl of silicon dioxide treated by aliphatic long side chains and sodium hydroxide is increased, so that the stability of the system is improved. And the quaternary amine acrylate is added, and the interaction force between amino and hydrogen b