Advanced Composite Materials

The Korean Society for Composite Materials (한국복합재료학회)
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Synthesis of Needle-Like Aragonite Crystals in the Presence of Magnesium Chloride and Their Application in Papermaking

  • Hu, Zeshan (Engineering research centre for waste oil recovery technology and equipment, Chongqing Technology and Business University) ;
  • Shao, Minghao (Engineering research centre for waste oil recovery technology and equipment, Chongqing Technology and Business University) ;
  • Li, Huayang (Engineering research centre for waste oil recovery technology and equipment, Chongqing Technology and Business University) ;
  • Cai, Qiang (Engineering research centre for waste oil recovery technology and equipment, Chongqing Technology and Business University) ;
  • Zhong, Chenghua (Engineering research centre for waste oil recovery technology and equipment, Chongqing Technology and Business University) ;
  • Xianming, Zhang (Engineering research centre for waste oil recovery technology and equipment, Chongqing Technology and Business University) ;
  • Deng, Yulin (School of Chemical and Biomolecular Engineering, IPST@GT, Georgia Institute of Technology)
  • Received : 2008.07.16
  • Accepted : 2008.09.09
  • Published : 2009.12.01
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Abstract

PCC (precipitated calcium carbonate) and ground calcium carbonate have been widely used in alkaline papermaking. Unfortunately, although increasing filler level in papers can improve the paper properties such as brightness, opacity, stiffness gloss, smoothness, porosity, and printability, as well as decrease cost, some strength of the paper is negatively affected. In this research, needle-like aragonite was synthesized using $Ca(OH)_2$ and $CO_2$ as reactants in the presence of $MgCl_2$ and characterized with scanning electronic microscopy (SEM) and X-ray diffraction (XRD). The physical and optical properties of the paper handsheets containing these needle-like aragonite fillers were evaluated. Results indicated that tensile strength, Z-direction tensile strength and folding endurance of the paper were improved by the needle-like aragonite crystals compared to the paper using commercial PCC (precipitated calcium carbonate) as filler. The stiffness of the paper handsheet on the machine direction was increased, but no evident difference in the cross direction was found. The improvement of paper strength mainly resulted from the twining effect between the aragonite whiskers and paper fibers. The optical properties of the paper were slightly decreased with the use of the needle-like aragonites compared to commercial PCC. These results suggest that paper cost can be decreased by increasing the content of needle-like aragonite filler while paper strength will not be decreased compared to PCC filler.

Keywords

References

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