The invention discloses a high isotactic
polypropylene alloy material and a preparation method thereof. The material contains 5-98.9 parts by weight of
polybutylene, 1-80 parts by weight of
polypropylene and 0.1-15 parts by weight of propylene-
butene copolymer; the isotacticity of the high isotactic
polypropylene is larger than 85%, and the
smelting point of the high isotatic polypropylene is 115-129 DEG C; the isotacticity of the high isotactic polypropylene is larger than 85%, and the
smelting point of the high isotactic polypropylene is 155-169 DEG C; the propylene-
butene copolymer contains a random
copolymer and a segmented copolymer of propylene-
butene. The preparation method uses a
titanium /
vanadium supported catalyst and adopts a multistage sequential
polymerization manner and specifically comprises the steps of carrying out propylene
polymerization or
butane-1
polymerization, then initiating
butane-1 polymerization or propylene polymerization, and respectively carrying out propylene polymerization or
butane-1 polymerization, and so on to synthesize the high isotactic polypropylene
alloy material. The material is a powdery or spherical product, and has the advantages of excellent
impact resistance,
thermal creep resistance and low shrinking percentage of
polybutylene, high modulus,
high surface hardness and fast setting of polypropylene, and the like.