The invention discloses a
starch-based surface
sizing agent as well as a
raw material composition, a preparation method and application thereof. The
starch-based surface
sizing agent comprises the following raw materials in parts by weight: 30-70 parts of a hard
monomer, 20-60 parts of a soft
monomer, 11-6 parts of a
functional monomer, 22-10 parts of a
functional monomer, 0.5-3.0 parts of an acid catalyst, 70-90 parts of native
starch, 5-20 parts of
polyol and 3-7 parts of an initiator. According to the invention, through the reaction of the polyhydric
alcohol and the native starch, the
surface strength of the raw paper can be greatly improved, meanwhile, linting and dusting are reduced, and the
sizing degree, smoothness and printability of paper can be effectively improved. And during
monomer graft copolymerization, functional monomers are introduced, so that the Cobb value of raw paper can be obviously improved while the cross-linking capability of the surface sizing agent and paper pulp fibers is further improved. According to the invention,
modified starch is replaced by native starch, and polyhydric alcohols and functional monomers are added, so that the product can be applied to paper pulp with different qualities, and the
water resistance of paper is obviously improved.