方解石型重质碳酸钙的表面改性及其在橡胶中的应用研究

作者对方解石型重质碳酸钙进行了表面改性及其在橡胶中的应用试验研究，研究表明，重质碳酸钙的粒度组成、矿浆浓度、改性药剂种类及用量和改性时间等均对改性效果有重要的影响。通过对改性效果效果的预先评价，确定了最佳的改性工艺条件。在橡胶中的应用试验显示，改性重质碳酸钙充填橡胶制品的性能良好，其应用前景广阔。

AStudy of the Surface Modification of Calcite_Type Heavy Calcium Carbonate (HCC) and Its Application to Rubber

The surface modification of inorganic powder is one of the important te chniques for the utilization of natural mineral resources. The paper studied the surface modification of calcite type heavy calcium carbonate (HCC) as well as its application to rubber. The samples used in the research were collected fr om weste rn Hubei and have a high purity of calcium carbonate. The techniques of both dry and wet chemical surface modification were employed in the research. The modifi cation effects of the samples were assessed by determining their active indices and sedimentary volumes. The research shows that such factors as grain sizes of the samples, pulp concentrations, types and amounts of modification agents and m odification time will greatly affect the results of modification. The determ inat ion of the best conditions for the tests depended on appraising modification res ults of the products. The action of modification agent upon the surface of HCC w as also studied. The result shows that the main action mode between the modifica tion agent and the surface of HCC is chemical adsorption, and the modification e ffects is excellent. The experiments of putting both modified ultra_fine HCC and light calcium carbon ate as a filler into rubber products were carried out in Wuhan Factory of Rubbe r Pro ducts. The results show that the former is more compatible with rubber. The exte nsometer and pull_apart strength of the products filled with modified HCC are ob viously higher than the products filled with light calcium carbonate, while the hardness and modulus (at a definite elongation) of the products filled with the former filler are nearly the same as those filled with the latter filler. Nevert heless, pull_apart permanent deformation of the products filled with modified HC C is larger than that of the products filled with light calcium carbonate. In sh ort, modified ultra_fine HCC, with which the rubber products show good propertie s, has a bright application prospects.