Fast-curing thermosetting sheet molding compound and preparation method thereof

The invention discloses a fast-curing thermosetting sheet molding compound and a preparation method thereof. The fast-curing thermosetting sheet molding compound is prepared from the following materials in parts by mass: 60 to 70 parts of unsaturated polyester resin; 30 to 40 parts of low-shrinkage resin; 90 to 110 parts of glass fiber; 160 to 170 parts of calcium carbonate; 3 to 5 parts of a cross-linking agent; 0.05 to 0.1 part of a polymerization inhibitor; 0.4 to 1 part of an antioxidant; 1.1 to 1.5 parts of an initiator; 0.3 to 1 part of a low-temperature initiator; 3 to 5 parts of a release agent; 0.3 to 1 part of titanium dioxide; and 2.5 to 4 parts of a thickening agent; wherein the cross-linking agent is styrene; the polymerization inhibitor is p-benzoquinone; the antioxidant is 2, 6-di-tert-butyl p-methylphenol; the initiator is tert-butyl peroxybenzoate; the low-temperature initiator is tert-butyl peroxy-2-ethylhexanoate; the release agent is zinc stearate; the thickening agent is active magnesium