聚乙烯吡咯烷酮及锂藻土对纤维素纳米结构纸的影响

Influence of Polyvinylpyrrolidone and Laponite on Preparation of Cellulose Nanostructured Paper

在纤维素纳米结构纸(CNP)制备过程中,用聚乙烯吡咯烷酮(PVP)和锂藻土(Laponite)作为分散剂,以降低纤维素纳米纤维(CNF)分散体的黏度,提高其脱水速度,避免CNF的絮聚。结果表明,相比未添加PVP和锂藻土的CNP,添加0.4%(相对于CNF绝干质量,下同) PVP和0.3%锂藻土的CNP的脱水时间从135 min减少到48 min,透明度从82.0%提高到90.3%,同时密度降低了63.6%,平均粗糙度(Ra)和均方根粗糙度(Rq)分别降低了69.7%和69.1%。

Polyvinylpyrrolidone(PVP)and laponite were used as dispersants to reduce the viscosity of cellulose nanofiber(CNF)aqueous dispersion during preparation precess of cellulose nanostructured paper(CNP). Compared to the CNP without adding PVP and laponite,the formation time of CNP with 0. 4% PVP and 0. 3% laponite was reduced from 135 to 48 min,its transmittance increased from 82. 0% to 90. 3%,and density decreased by 63. 6%,mean roughness(Ra)and root mean square roughness(Rq)decreased by 69. 7% and 69. 1%,respectively.