The invention discloses a high-strength and high-
toughness polyvinyl chloride injection molded composition and a preparation method thereof. The composition comprises, by weight, 50-90 parts of PVC (
polyvinyl chloride) resin 1, 5-20 parts of PVC resin 2, 5-40 parts of ACR-g-VC (acrylic graft
vinyl chloride) resin, 3-10 parts of parts of
impact modifier, 4-6 parts of compound stabilizer, 0.5-2 parts of internal
lubricant, 0.5-1.2 parts of external
lubricant, 1-5 parts of fillers, 1-3 parts of
plasticizer and 0.1-1 part of antioxygen. The preparation method includes: weighing the ingredients according to a formula about weight ratios, placing in a high-speed mixer, mixing to obtain a
polyvinyl chloride mixture, adding the polyvinyl
chloride mixture into a tapered double-screw extruder, melting, extruding,
pelletizing and packaging. Compared with a product prepared according to a formula adopting normal SG8 type PVC resin, the high-strength and high-
toughness polyvinyl
chloride injectionmolded composition has the advantages that plasticizing time can be shortened by more than 20%, and
impact strength can be enhanced by more than 10 times.