包覆型GCC的制备及其对加填纸张性能的影响

Preparation of Coated GCC and Its Effect on the Property of Paper

通过化学方法将轻质碳酸钙(PCC)沉淀在重质碳酸钙(GCC)表面,实现对GCC表面包覆改性,借助SEM观察了改性后GCC的表面形态,研究了不同反应条件下制备的包覆型GCC加填对纸张性能的影响。结果表明,包覆型GCC表面沉积了一层PCC粒子。反应浓度0.2mol/L、反应温度25℃、n(GCC)∶n(CaCl2)为3∶1条件下制得的包覆型GCC在纸张中的留着率高,对纸张强度影响较小。加填25%包覆型GCC的纸张性能比加填15%未包覆的GCC的略好。

In the paper, GCC was modified by precipitating PCC on its surface with chemical method. The surface morphology of the modified GCC was observed with the help of SEM. Coated GCCs prepared under different reaction conditions were applied in papermaking, and the effects of coated GCC loading on the paper property were studied. The results indicated that the GCC was coated by a fine layer of PCC. As fillers in papermaking, the one showed higher retention in wet end and lower influence on paper strength could be prepared under the conditions of concentration about 0.2 mol/L, temperature about 25℃ and the molar ratio of GCC and CaCl2 about 3： 1. The properties of paper added 25% modified GCC were better than those added 15% unmodified GCC.