| Calcium carbonate, a common filler, has been used in many fields such as rubber, coating, paper making and commodity. Because the hydrophilic and oil-phobic characteristic of the surface of CaCO3 granule and the apparent inclination to agglomerate, CaCO3 powder cannot be directly used without previous surface modification. Some surface modification methods have been adopted industrially.With the rise of the nanometer science, the produce of nano-CaCCh was fulfilled recently. Since the smaller granule bring the more serious agglomeration, it put forward the new requirement of surface treatment to exploit the application of nano-CaCO3. In order to get this goal, the research was focus on two parts.1 , surface treatment and filling in plasticsAfter a great deal of experiments, the appropriate surfactant is confirmed as an acrylic multipolymer. The right polymerization method is established depending on the study of the effects of monomer, acid, emulsifiers and latex concentration on final composite performance. The treated nano-CaCO3 was added to join the polymerization of chloroethylene monometer. By means of in situ suspension polymerization, the PVC/ nano-CaCO3 composite was obtained. TEM photo shows the dispersion of nano-CaCOa in polymer matrix was perfect and the impact resistance is improved significantly. 2 the application in building coatingThe dispersion of nano-CaCOs in latex is the key to prepare the novel buildingcoating. To solve it, the latex that matches the nano-CaCO3 is synthesized relying on numerous experiments. The test shows many performances of novel coating using the nano-CaCO3 as an important pigment are sharply better than those of common coating using the light CaCO3. |
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