基于铸涂法的高透明纳米纸的高效制备工艺

Efficient Preparation of Highly Transparent Nanopaper by Casting Method

以纳米纤丝化纤维素(NFC)为原料,采用铸涂工艺制备高透明纳米纸。首先,通过改变纳米均质的次数调控纳米纤维素分散体的理化性能(黏度、保水值和纤维尺寸)。其次,研究纳米纤维素分散体理化性能和纳米纸干燥参数对其干燥速率的影响规律,探究最佳干燥工艺,快速制备出高透明纳米纸。研究表明:随着均质次数的上升,纳米纤维素分散体的黏度、保水值以及纤维素直径呈现下降趋势,且这些理化性能对高透明纳米纸的干燥速率没有影响。当干燥温度为40℃,相对湿度为30%时,制备定量为30g/m^2的高透明纳米纸所需的时间小于5h。纳米纸的强度达到140MPa,表面粗糙度为3.13nm,在可见光区透光率约为90%。

A highly transparent was prepared from nanopaper nanofibrillated cellulose （NFC） by casting method. As the first step, the physical and chemical properties （viscosity,water retention value and fiber dimension） of NFC were rationally modulated by times of treating with high-pressure homogenizer. After that, the effect of the properties of NFC and drying parameters on the drying time of nanopaper was investigated in detail, aiming to explore the optimum drying procedure for highly transparent nanopaper. The results show that the viscosity, the water retention value, and the fiber diameter decreased as the increasing treatment cycles. However, these parameters have limiting effect on the drying time of nanopaper. The drying time of a transparent nanopaper （ 30g/m^2 ） is less than 5 hours when the drying temperature and relative humidity reached 40℃ and 30% ,respectively. The resulting nanopaper exhibits a tensile strength of 140 MPa,a surface roughness of 3.13nm,and a light transmittance of 90%.