The application discloses a preparation method of nano
calcium carbonate for TPR shoe materials, and comprises the following steps: S1, a
mixed gas containing
carbon dioxide is introduced into a
calcium hydroxide suspension to perform a
carbonation reaction, and when a downward trend of reaction
conductivity appears,
sodium cocoyl isethionate is added to continue the reaction; S2, when the
conductivity returns to the
conductivity level before the reaction, the
mixed gas is stopped, and the suspension is subjected to high-speed emulsification and dispersion treatment; S3, after the emulsification is completed, the
carbonation reaction is continued, and when the pH of the
reaction system is less than or equal to 7.5, the nano
calcium carbonate suspension is obtained; S4, the nano
calcium carbonate suspension is sequentially added with an ethoxylated
tallow alcohol,
sodium stearate and a compound of
zinc dialkyldithiophosphate to perform surface treatment; and S5, pressure
filtration,
drying, pulverization and sieving are performed, and the nano
calcium carbonate is obtained. The nano
calcium carbonate prepared by the method can be uniformly distributed in an SBS matrix, the adhesion between the calcium
carbonate and the matrix is enhanced, and the
processing fluidity of the SBS and the mechanical properties of the TPR shoe material are improved.