酸解法制备纳米纤维素及其在造纸中的运用

本科毕业设计(论文)

题目: 酸解纳米纤维素及其在造纸中的运用

姓名: 彭朗

学院: 轻工科学与工程学院

专业: 制浆造纸装备与控制

班级: 1015022 学号: 101502214 指导教师: 程金兰职称:副教授

二○一四年五月八日

酸解纳米纤维素及其在造纸中的运用

摘要

论文综述了采用硫酸水解法制备纳米纤维素（NCC）。纳米纤维素(NCC)由于其大量、可再生、可生物降解以及优良的力学性能，成为纳米技术领域研究新热点。

本研究采用以漂白阔叶木为原料，用硫酸水解法制得纳米纤维素，通过纳米激光粒度仪、颗粒电荷测定仪（PCD）、紫外可见分光光度计等分析手段，对其形态和光学特征进行了表征，并研究了不同反应条件下对纳米纤维素的得率的影响。得出以下结论：

1.用62wt%的硫酸制备的纳米纤维素的得率最高，在23.44%-24.8%之间。

2.通过测定PCD，可以发现在不同的反应条件下，纳米纤维素中所带电荷量有所不同，其中在用62wt%硫酸制备的纳米纤维素中的电荷含量变化不大，并且比其他条件下制备的纳米纤维素所带电荷量略高。

将反应制备的纳米纤维素应用于造纸化学湿部，可以得出以下结论：

1.纳米纤维素的加入提高纸张的白度；添加阳离子淀粉可以明显提高纸张的撕裂度，单独添加纳米纤维素也可以提高对纸张的撕裂度，和阳离子淀粉复配使用时可以提高更显著。

2.单独添加纳米纤维素对纸张耐折度影响不明显，但和阳离子淀粉复配使用时可以显著提高纸张耐折度。

3.添加阳离子淀粉可以明显提高纸张的抗张强度，单独添加纳米纤维素对纸张抗张强度影响不明显，但和阳离子淀粉复配使用时可以提高纸张抗张强度。

关键词：纳米纤维素；得率；纸性

Nano-acid hydrolysis of cellulose and its use in papermaking

ABSTRACT

Reviewed papers prepared by sulfuric acid hydrolysis of cellulose nano (NCC). Nano-cellulose (NCC) due to their large number, renewable, biodegradable and excellent mechanical properties and become a new hot research field of nanotechnology.

In this study, bleached hardwood as raw materials, nano sulfuric acid hydrolysis of cellulose by Zetasizer Nano particle charge analyzer (PCD), UV-visible spectrophotometer and other analytical tools, its morphology and optical characteristics of the characterization, and the effects of different reaction conditions on the yield of nano-cellulose. The following conclusions.

1.With 62wt% sulfuric acid was prepared by nano-cellulose highest rate between 23.44% -24.8%.

2.By measuring the PCD, can be found under different reaction conditions, the amount of nano-cellulose in different electric charge, wherein the charge changes with the content of nano-cellulose 62wt% of the sulfuric acid is not produced and prepared under other conditions than nano-cellulose electric charge amount is slightly higher.

Prepared by the reaction of the nano-cellulose used in papermaking wet-end chemistry, we can draw the following conclusions:

1.Nano-cellulose added to improve the whiteness of the paper;Add a cationic starch can significantly improve the tearing of the paper, cellulose nano alone can improve the paper tearing, and cationic starch when mixed use can improve more pronounced.

2.ndividual nano-cellulose paper folding is not obvious, but the use of complex and cationic starch can significantly improve paper folding.

3.Add a cationic starch can significantly improve the tensile strength of the paper, separate paper cellulose nano tensile strength is not obvious, but the use of complex and cationic starch can improve the tensile strength of paper.

Keywords: nano-cellulose; yield; paper property