The invention discloses a preparation method of nano
calcium carbonate reinforced and toughened PVC (
polyvinyl chloride), which comprises the following steps: (1) dissolving
sodium ricinoleate
sulfate in water, and carrying out
ultrasonic oscillation at
room temperature for 5-10 minutes to obtain a solution A; dissolving
silicon salt in an
ethanol solution to obtain a solution B; (2) adding alkali into the solution B in a stirring state, carrying out
ultrasonic oscillation, then adding diethanol amine, and continuously carrying out ultrasonic treatment to be mixed with the solution A, so as to obtain a surface treating agent; (3) adding a surface treating agent into the nano
calcium carbonate suspension, heating for reaction, washing and
drying to obtain modified nano
calcium carbonate; and (4) mixing the modified nano
calcium carbonate, PVC resin and auxiliary materials according to a certain proportion, curing, extruding and cooling to obtain the product. According to the invention, the nano
calcium carbonate suspension is subjected to wet
surface modification by adopting the surface modifier, and the toughened PVC nano
composite material is prepared by compounding PVC and nano
calcium carbonate, so that the strength and rigidity are improved while
toughening is realized, and the
heat resistance of the material is improved.