▎ 摘　　要

NOVELTY - Calcium carbonate filler comprises 800-1200 pts. wt. calcium carbonate prepared from oyster shell powder, 6-10 pts. wt. talc, 60-80 pts. wt. melamine resin, 4-12 pts. wt. aluminate coupling agent, 10-20 pts. wt. silica, 10-20 pts. wt. graphene, 20-30 pts. wt. rhenium oxide, 30-50 pts. wt. bio-polyurethane resin, 50-100 pts. wt. butyl titanate and 3000-6000 pts. wt. deionized water, where the content of particles with a particle size of 0.36 mu m or less is 36% or less, and the content of plant-derived components in the biopolyurethane resin is 60-70 wt.%. USE - As calcium carbonate filler. ADVANTAGE - The calcium carbonate filler effectively solves the technical problem that the medium calcium carbonate weakens the material performance due to the influence of the modifier, realizes the technical effect of improving the material performance and is environmentally-friendly. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing the calcium carbonate filler comprising (a) adding calcium carbonate powder to an appropriate amount of deionized water, stirring slowly for 5 minutes, changing to high-speed rotating stirring at 1500 rpm for 2-3 hours, and maintaining the temperature of 50-65 degrees C, (b) adding talc, melamine resin, bio-polyurethane resin, butyl titanate and rhenium oxide into the quick kneader, adding glycerol triacetate, mixing with calcium carbonate, heating up to 85 degrees C, keep stirring for half an hour, (c) continuously adding aluminate coupling agent, silicon dioxide, graphene, polyisobutylene and glycerol triacetate to the rapid kneader, continuously heating up to 140 degrees C, and stirring for 1-2 hours to obtain a mixture, and (d) pouring out the mixture obtained in step (c), adding deionized water, stirring and grinding for half an hour to form a suspension, adding modified polyamide to the suspension, stirring at 1200-1500 rpm for 8-10 minutes, drying and pulverizing into fine powder to obtain the product.