【作者】 于洋；

【导师】 王子忱；

【作者基本信息】 吉林大学 ， 物理化学， 2008， 硕士

【摘要】 碳酸钙作为不可缺少的优质无机白色填料和颜料,在造纸工业中得到广泛的应用。我国传统轻质碳酸钙,基本可满足中、小纸厂的中、低档纸张填料用途,却不能适应高速发展的造纸业的需要。用于造纸填料和涂料的高品质CaCO3应具备高白度、高纯度、高散射系数、适宜的粒度分布、低磨耗值、稳定的pH值、良好的化学稳定性、良好的着色性等性能和特点。本论文致力于研究开发具有以上性能和特点的高品质碳酸钙产品,具体内容如下:本论文采用碳化法,以聚丙烯酸作为晶形控制剂,制备出具有单晶特点的方解石型的晶须状碳酸钙粒子,此种产品作为填料添加到纸张中,有望提高纸品的强度;并且具有针状外形的晶须在加入到纸张中的时候,可以沿着加工应力的方向定位从而改善其取向方向的机械性能;另外,表面光滑的晶须对制品的表面光洁度也有较好的影响。另外,本论文采用简单的液相沉积的方法,利用十二烷基磺酸钠和聚丙烯酸组成“核–壳式”复合物,作为制备中空球的模板,合成了中空球形碳酸钙粒子。此种产品吸收油墨的能力强于其他形貌的碳酸钙粒子,能够做为高档复印纸的白色颜料。最后,本论文采用碳化的方法,以十二烷基二甲基甜菜碱(BS-12)为有机质,合成自分散性纳米碳酸钙粒子。此产品有望提高纸张的平滑度,降低粗糙度,提高纸张的光泽度,对纸张的遮盖能力极强。这一研究对实现我国造纸用碳酸钙产品系列化、专用化、功能化以及高档碳酸钙产品国产化具有重要意义。更多还原

【Abstract】 As an important filler and pigment, Calcium carbonate is widely used in paper-making industry. PCC fillers which made by our tradition ways are good for low quality paper making in small and medium-sized factory, but they can not catch up with the high development speed of paper making industry of China. We need high level CaCO3 with high brightness, high content, high dispersion coefficient, suitable granularity distribution, low abrasion, stable PH value, chemical resistant, easier pigmentation ect. The detail is as followed:According to carbonation way, we use polyacrylic acid as the organic template, which can efficiently interact with calcium carbonate crystal, to control the polymorphs and the morphologies of calcium carbonate. The final product is calcite calcium carbonate and it is good to be fillers for paper making which can improve paper strength. Also, needle-like crystal can improve paer mechanical quality; the soomth needle surface can reach better paper surface. Hollow CaCO3 microspheres were successfully synthesized through the precipitation reaction in the presence of polyacrylic acid (PAA) and sodium dodecyl sulfonate (SDS) and the“core-shell model”of PAA/SDS micellar aggregates serves as the spherical templates to generate hollow microspheres of CaCO3 crystals in the precipitation system. This produce can improve paper heat resistant, keep the paper density and reach better smooth paper surface. CaCO3 nanoparticles with about 50 nm in size could be prepared by carbonation reaction of a mixture of Ca(OH)2 and dodecyl dimethyl betaine (BS-12) via bubbling CO2 gas. The results indicate that the CaCO3 powder samples can self-diffuse in water, thus forming a suspension with enhanced stability and longevity. The product can impove paper color and ink absorbability.更多还原