硼氮掺杂碳点对棉织物防紫外线性能的影响

为提高棉织物的防紫外线能力,以柠檬酸、乙二胺和硼砂为原料,采用一步水热法合成了硼氮掺杂碳点(BN-CDs), 将BN-CDs水溶液、BN-CDs/聚乙烯醇共混水溶液和BN-CDs/水性聚氨酯共混水溶液分别喷涂于棉织物表面,再对棉织物进行碾压干燥处理,测试了织物的紫外线防护系数及其耐水洗性能等。结果表明:所制备的BN-CDs表面上含有丰富羟基和胺基的石墨状纳米晶体,兼具良好水溶性;在紫外区具有强吸收峰,在紫外光激发下可以发出蓝色荧光,且荧光发射波长不依赖于激发波长;整理后的棉织物均表现出极高的紫外线防护系数(UPF); 经BN-CDs/水性聚氨酯整理后的棉织物效果最佳,水洗10次后UPF值仍保持在48左右,达到较高的保护级别,且棉织物表面形态基本不变,手感良好,可满足棉织物紫外线防护要求。

Effect of boron nitrogen doped carbon dots on ultraviolet-protection of cotton fabrics

In order to improve the UV-resistant ability of cotton fabrics, boron-nitrogen-doped carbon dots (BN-CDs) were synthesized by a one-step hydrothermal method with citric acid, ethylenediamine and borax as raw materials. BN-CDs aqueous solution, BN-CDs/PVA aqueous solution and BN-CDs/waterborne polyurethane aqueous solution were sprayed on the surface of cotton fabric, respectively, and then the cotton fabric was rolled and dried. The results show that the prepared BN-CD is a graphite-like nanocrystal having a rich hydroxyl group and amine group on the surface, which make BN-CDs soluble in water. BN-CDs has a strong absorption peak in the ultraviolet region, and could emit bright blue fluorescence which is independent of excitation wavelengths. The finished cotton fabrics show high UV protection factors (UPF), BN-CDs/WPU finishing has the optimal effect. After 10 times washing, the UPF value remained at around 48, achieving the excellent protection level. The surface morphology of the cotton fabric is basically unchanged, and the hand feel was good, and meeting the ultraviolet protection requirement of the cotton fabrics.