胍盐改性纳米纤维素制备高强度阻隔包装纸

Preparation of High-strength Barrier Packaging Paper from Guanidine Salt-modified Nanocellulose

关键词:  双醛氧化  胍盐接枝  抗菌纳米纤维素  涂布

Key Words:dialdehyde oxidation  guanidium salt  antimicrobial nanocellulose  coating

摘要:利用高碘酸钠氧化纳米纤维素，引入双醛基团，并接枝胍盐制得改性纳米纤维素。以胍盐接枝纳米纤维素为涂料，进行表面涂布，并结合玉米醇溶蛋白，制备内层涂布胍盐接枝纳米纤维素、外层涂布玉米醇溶蛋白的双层涂布纸。结果表明，胍盐成功接枝到双醛纳米纤维素表面，并使纳米纤维素获得了良好的抗菌性能。双层涂布法有效提高了纸张的防油防水能力、抗张强度和耐破度，防油等级达到9级，Cobb₆₀值降低到46.1 g/m²，抗张强度和耐破度分别达到6.30 kN/m和267 kPa，所制包装纸具有良好的油水阻隔效果和机械强度。

Abstract:Nanocellulose was oxidated by sodium periodate to introduce dialdehyde groups， followed by grafting the guanidium salt to obtain the modified nanocellulose. Then the guanidinium-grafted nanocellulose was utilized as coating material for surface coating and combined with zein， to produce the double layer coated paper with guanidinium-grafted nanocellulose as the inner layer and zein as the outer layer. The results showed that the guanidium salt was successfully grafted onto the surface of dialdehyde nanocellulose， as well as giving antibacterial properties to nanocellulose. The double layer coating method effectively improved the oil and water resistance， tensile strength， and burst strength of paper. The oil resistance grade reached 9， the Cobb₆₀ value decreased to 46.1 g/m². The tensile strength and burst strength reached 6.30 kN/m and 267 kPa， respectively， and the prepared packaging paper exhibited excellent oil-water barrier properties and mechanical strength.