Effects of chitin nanocrystals on coverage of coating layers and water retention of coating color

IF 20.2 Q1 MATERIALS SCIENCE, PAPER & WOOD
Ruoshi Gao, Yi Jing, Yeyan Ni, Qiwen Jiang
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引用次数: 8

Abstract

This study assessed the applicability of chitin nanocrystals prepared by 2, 2, 6, 6-Tetramethyl-1-Piperidine-1-oxyl radical (TEMPO)-mediated oxidation in traditional papermaking coating color systems. The α-chitin nanocrystals (CTNCs) with different carboxyl content, size, and morphology were prepared from crab shells by alkali pretreatment and TEMPO-mediated oxidation in the water at pH 10, and then the ratio of CTNCs to latex was applied to traditional coating color system to replace part of latex. The results showed that when the amount of NaClO added as co-oxidant in the oxidation was 15.0 mmol/g of chitin, the carboxyl content of alkali-pretreated CTNCs was up to 0.76 mmol/g. The amount of carboxyl groups presented a linear relation with the degree of individualization of nanocrystals and dispersion. When the ratio of latex to CTNCs was 90꞉10, the water retention value of the coating was 92% lower than that of the pure latex system, and the rheological property was better. The relationship between the addition amount of CTNCs and the surface strength and the coverage of coating layers were also studied, and results showed that when the ratio of latex to CTNCs was 95꞉5, the surface strength was the highest of 1.45 m/s, and the coverage of coating layers rate reached the highest of 78%.

几丁质纳米晶体对涂层覆盖度和涂层保水性能的影响
本研究评估了2,2,6,6 -四甲基-1-哌啶-1-氧自由基(TEMPO)氧化法制备的几丁质纳米晶体在传统造纸涂料颜色体系中的适用性。以蟹壳为原料,在pH为10的水中经碱预处理和tempo氧化制备了羧基含量、粒径和形貌不同的α-几丁质纳米晶体(CTNCs),并将CTNCs与乳胶的比例应用于传统的涂料配色体系中,以取代部分乳胶。结果表明,当氧化过程中加入氯化钠作为共氧化剂的量为15.0 mmol/g甲壳素时,碱预处理CTNCs的羧基含量可达0.76 mmol/g。羧基的数量与纳米晶体的个体化程度和分散程度呈线性关系。当乳胶与CTNCs的比例为90 10时,涂层的保水值比纯乳胶体系低92%,流变性能更好。研究了CTNCs的添加量与涂层表面强度和涂层覆盖率的关系,结果表明,当乳胶与CTNCs的比例为95 5时,涂层表面强度最高,达到1.45 m/s,涂层覆盖率最高,达到78%。
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来源期刊
Journal of Bioresources and Bioproducts
Journal of Bioresources and Bioproducts Agricultural and Biological Sciences-Forestry
CiteScore
39.30
自引率
0.00%
发文量
38
审稿时长
12 weeks
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