超细重质碳酸钙粉表面改性与充填聚丙烯试验研究

重质碳酸钙粉是一种普通的无机非金属填料，经过超细粉碎和改性，可以将其变成一种性能优越的功能填料。本文选用鄂西生产的超细重质碳酸钙粉为试验物，对其表面改性的试验方法、改性剂选择及用量、改性条件及改性效果等方面进行了一定探讨。分别采用了表面化学包覆法和干法和湿法两种改性方法对超细重质碳酸钙进行了改性。用表面改性偶联剂中的金属酯偶联剂和硅烷偶联剂，按不同剂量进行不同条件多组改性实验，使超细重质碳酸钙粉由

TestStudy on the Surface Modification of the Superfine HeavyCalcium Carbonate and Its Filling to Polypropylene Plastics

Through superfine pulverization and modification, heavy calcium carbonate powder , a kind of common filling agent, can be changed into superfine heavy calcium ca rbonate (SHCC) powder, which is a sort of function material with excellent prop erties. The authors collected SHCC from calcite mines of western Hubei. First, t he authors tested different surface modification methods for SHCC, defined the t ypes and dosages of modification agents, found out the conditions of modificatio n and appraised the results of tests. In the modification process, the authors a pplied two kinds of surface chemical covering methods, i.e., dry method and wet method, to change the surface properites of the SHCC, and used metal ester coupl ing agent and silane finish as surface modification agents to perform the test a cco rding to different dosages of the agents under various conditions. In the final test, the SHCC was changed from lyophilic to lyophobic. The authors decided the better test plan for the surface modification of SHCC by comparing and appraisin g the whitenesses, grain sizes and infrared spectral features of the SHCC. At th e second step, the authors filled a few kinds of modified SHCC powder which were treated with different surface modification agents into the polypropylene plast ics, and then produced a few kinds of compound polypropylene plastics by means o f the compound shaping skill. Through comparing the properties of different kind s of compound polypropylene plastics, the authors conclude that (1) the function s of compound polypropylene plastics filled with modified SHCC were better t han those of polypropylene plastics not filled with modified SHCC except for ten sion intensity, and (2) the functions of polypropylene plastics filled with the SHCC which was modified by metal ester coupling agent are better than those of p olypropylene plaastics filled with the SHCC which was modified by silane finish.