锦纶对紫外吸收剂的吸附和抗紫外性能

采用反应型和非反应型紫外吸收剂对锦纶织物进行紫外线防护整理,研究了处理浴pH值和温度对紫外吸收剂在锦纶上吸附的影响,以及中性和碱性浴中紫外吸收剂在锦纶上的解吸性能,并测定了其在锦纶上的提升性和整理后织物的抗紫外性能。结果表明,紫外吸收剂在锦纶上的吸附量随着pH值的下降而升高,离子键结合对其吸附有重要影响;因紫外吸收剂分子结构小,故其吸尽率受温度的影响很小;吸附在锦纶上的紫外吸收剂的解吸量,碱性浴较中性浴多,适当提高浸渍温度和采用反应性紫外吸收剂,可提高整理效果的耐洗性;不同紫外吸收剂在锦纶上表现出不同的吸尽率、提升性和紫外防护功能,紫外吸收剂在UV-A波段的吸收程度对锦纶织物的紫外防护性能影响极大。     

PET包装材料中紫外吸收剂迁移研究进展

PET包装材料广泛应用于食品包装中,为了提高对应的抗光氧化能力,会添加一定量的紫外吸收剂于其中,而紫外吸收剂在长期贮存过程中存在迁移溶出隐患。对PET包装材料中紫外吸收剂的种类、迁移机制及国内外迁移研究进展进行综述,并进行展望。     

防紫外线聚丙烯腈复合纳米纤维的制备及其性能

为制备防紫外线功能的纳米纤维制品,选用聚丙烯腈（PAN）和紫外线吸收剂UV531 作为原料,利用静电纺丝方法制备了纯PAN 和PAN 复合纳米纤维膜,用扫描电子显微镜、紫外线透反射分析仪等分析了纳米纤维的微观形貌、化学性能、紫外线防护性能等。结果表明：紫外线吸收剂的加入有效地减小了复合纳米纤维的直径,纯PAN和PAN 复合纳米纤维膜的红外光谱均表现出ＰＡＮ 的特征峰,说明紫外线吸收剂的加入没有改变PAN的内部结构;紫外线吸收剂的加入提升了复合纳米纤维膜的紫外吸收性能和紫外防护性能,随着紫外线吸收剂含量的增加,紫外吸收值和紫外防护因子越大,而紫外线的透射率越小;因此,PAN复合纳米纤维膜是非常优异的防紫外线制品。     

紫外吸收剂及紫外屏蔽纤维/织物的发展

紫外屏蔽织物可保护皮肤免受过多阳光的伤害。本文对紫外线的组成及其危害 ,紫外吸收剂的种类及其各自的性能、优缺点进行了综合性的论述。同时介绍了紫外屏蔽纤维 /织物的加工方法以及防紫外织物的性能评价和防护指标     

基于确定性迁移模型研究聚乙烯食品接触材料中紫外吸收剂的迁移规律

目的 研究不同条件下低密度聚乙烯(Low density polyethylene,LDPE)食品接触材料中3种紫外吸收剂[2-(2′-羟基-5′-甲基苯基)苯并三唑(UV-71]、2-羟基-4-甲氧基苯并苯酮(UV-9)、2-羟基-4-正辛氧基苯并苯酮(UV-531))的迁移,基于确定性迁移模型得出吸附扩散的重要参数—分配系数和扩散系数,并研究其迁移规律。方法 采用双螺杆挤出机将LDPE粉料和3种紫外吸收剂混合并挤出造粒后,在175 ℃～180 ℃,70 Pa下,注塑为膜。针对高浓度酒精类食品生产加工储运场景,采用50%、70%、95%乙醇作为食品模拟物,在20 ℃、40 ℃、60 ℃下进行迁移试验。用超高效液相色谱仪测定不同时间点紫外吸收剂的迁移量,根据Piringer模型对数据进行拟合,得出扩散系数和分配系数,研究温度、食品模拟物、紫外吸收剂含量对迁移的影响。结果 温度对迁移影响最大,随着温度升高紫外吸收剂扩散系数增加,分配系数降低;乙醇含量对紫外吸收剂的扩散系数影响不显著,而随着乙醇含量的增加分配系数逐渐减小;紫外吸收剂的含量对迁移影响最小,扩散系数和分配系数变化不明显(除UV-71的分配系数随含量的增加而降低)。结论 采用Piringer 确定性模型研究LDPE中3种紫外吸收剂向高浓度酒精类食品模拟物迁移的扩散系数和分配系数,为食品接触材料中紫外吸收剂的风险评估提供了有效方法。     

纳米TiO_2改性及其抗紫外性能的研究进展

简述了纳米Ti O2的性质,重点综述了国内外对纳米Ti O2的无机改性方法和有机改性方法,并针对纳米Ti O2抗紫外性能在化妆品、纺织、复合材料、塑料和涂料等方面的发展情况进行了综述。     

防紫外线织物（一）

本文分析了防紫外线织物的情况,对紫外吸收剂和反射剂的性能和应用进行了评述,并对加工技术进行了归纳。作者在总结分析现状的基础上结合国内具体条件,从防护剂、加工技术、产品和测试等方面,提出了这类整理织物今后探索和研究的内容。     

固相萃取-高效液相色谱法测定地表水中 4种紫外吸收剂的含量

目的建立固相萃取-高效液相色谱方法检测地表水中4种紫外吸收剂含量的方法。方法采用固相萃取方法净化并浓缩大体积的样品,优化固相萃取条件,用高效液相色谱法检测4种紫外吸收剂的含量,并计算方法的线性范围、回收率、检出限和精密度等参数,并应用本方法检测湘江水和池塘水中紫外吸收剂的含量。结果通过应用固相萃取前处理样品和高效液相色谱法检测样品,本方法检测低限(LOD)达到了2.2~3.7μg/L,线性范围0.100~100μg/m L,回收率72.6%~93.3%,相对标准偏差(RSD)2.61%~4.37%。结论本方法简便、快速、稳定,能够满足实际检测的需要,可以为地表水中危害因子的检测和监控提供技术支持。     

超高效液相色谱法同时测定食品接触用塑料树脂原料中的8种苯并三唑类紫外吸收剂

目的采用有机溶剂回流提取结合超高效液相色谱(ultra high performance liquid chromatography,UPLC)技术,建立食品塑料包装材料树脂原料中的8种苯并三唑类紫外吸收剂(UV-0、UV-9、UV-71、UV-329、UV-326、UV-327、UV-234、UV-360)的检测方法。方法塑料树脂经正己烷回流提取,C18色谱柱分离后,经乙腈和-0.1%甲酸水溶液为流动相梯度洗脱,采用二极管阵列检测器测定。结果 8种苯并三唑类紫外吸收剂在0.5~100 mg/L范围内线性关系良好,相关系数(r2)均不低于0.9998,方法检出限(S/N=3)为0.055~0.286 mg/L,方法定量限(S/N=10)为0.071~0.486 mg/L,平均加标回收率(n=6)为70.0%~107.5%,相对标准偏差(relative standard deviation,RSD,n=6)为0.23%~7.8%。结论该方法灵敏、准确,适用于食品接触用塑料树脂中8种紫外吸收剂的同时检测。     

超临界二氧化碳涤纶抗紫外线整理

采用苯并三唑类紫外线吸收剂UV-234,在超临界二氧化碳中对涤纶进行抗紫外整理.研究了温度、时间对紫外线吸收剂UV-234在纤维上的吸附性能、纤维抗紫外性能和织物物理性能等影响.结果表明,在处理温度为393 K,处理时间90 min,压力20MPa的工艺条件下,涤纶织物经UV-234整理,UPF值可达60.     

Review on: developing UV protection for cotton fabric

In recent years, there is a progressive increase in UV radiation on human skin caused by the depletion of the ozone in the earth’s atmosphere. As long-term exposure to UV light can result in a series of negative health effects such as acceleration of skin aging, photodermatosis (acne), erythema (skin reddening), and even skin cancer. Developing textiles with UV protection functionality has been widely researched up to now. This review summarized the interaction between UV radiation and cotton surfaces and presents recent researches focused on the topic. The review also reported the relation between ultraviolet light and the structural, physical, and chemical properties of textiles. Moreover, conventional and novel chemicals and techniques of UV protection for cotton fabric such as UV absorbers, nanoparticles, and layer-by-layer self-assembly (LbL) have been discussed in this paper.     

抗紫外线整理剂在棉织物后整理中的应用研究

采用新型反应型紫外线吸收剂TINOFAST CEL来研究抗紫外线整理剂在纯棉漂白织物后整理中的应用。主要研究TINOFAST CEL用量、碱用量、盐用量、处理时间、处理温度等对纯棉漂白织物性能的影响以及整理后棉织物的抗紫外线效果。TINOFAST CEL整理的工艺条件为：TINOFAST CEL 4%（omf）,Na2SO4 20 g/L,Na2CO3 10 g/L。浸轧法工艺为：2浸2轧（轧余率70%）→预烘（80℃,3 min）→焙烘（160℃,1 min）。TINOFAST CEL与活性染料上染相似,整理后对织物白度几乎没有影响,并且赋予织物良好的抗紫外线性能。     

溶胶-凝胶法制备紫外光固化有机无机杂化材料的研究进展

溶胶-凝胶法是制备有机无机杂化材料的有效途径,将其与紫外光固化技术结合,制备得到的杂化材料具有固化速率快、环保、适用于热敏感基材等优点,但也存在着残留水分子影响紫外光固化过程、有机无机网络形成速率不一致造成的体系不稳定等问题。文章综述了该类杂化材料的原理及其在耐磨材料、阻燃材料、光学增透膜等方面的应用,最后展望了其在多种功能材料上的潜在应用价值。     

Protection of silica-coated ZnO nanoparticles on pre-dyed polyester fabrics against photofading

This work was designed to investigate the ability of silica-coated ZnO (ZnO&SiO₂) nanoparticles (NPs) as ultraviolet (UV) absorbers for protecting pre-dyed polyester fabrics against photofading. Despite that ZnO NPs are excellent UV absorbers, their strong photocatalytic activity limits the application in UV protection. In this study, a silica layer was coated onto ZnO NPs to form a physical barrier between the ZnO and a polyester substrate, which allowed effective UV shielding while minimising the harmful effects of photocatalytic activity on the substrate. The structure and optical proprieties of ZnO&SiO₂ NPs were observed. The bare ZnO and ZnO&SiO₂ NPs were, respectively, applied to polyester fabrics coloured with three kinds of dyes by a dip coating method. The photofading level of treated fabrics after exposure under simulated sunlight was evaluated. The ZnO&SiO₂ NPs exhibited excellent protection on pre-dyed polyester fabrics against photofading.     

光稳定剂对纯棉热转移印花织物耐光性的影响

研究不同抗氧剂、紫外线吸收剂及其用量对纯棉热转移印花织物耐光性的影响。试验结果表明，抗氧剂和紫外线吸收剂的添加均能不同程度地提高印花织物的耐光性；而利用协同效应，在整理液中同时添加0．5％的抗氧剂441和6％的紫外线吸收剂336，能够得到较理想的效果。     

新型紫外线吸收剂的合成及应用

通过重氮化、偶合和氧化成环反应合成了苯并三唑类紫外线吸收剂A,再经酰胺化反应合成了3只不同结构的紫外线吸收剂B、C、D,利用核磁共振谱和熔点测定等手段确证了其结构.采用DMF为溶剂,测量了4只紫外线吸收剂的最大吸收波长;分析了紫外线吸收剂质量浓度与吸光度的关系.将4只紫外线吸收剂经分散后用高温高压浸染法对涤纶织物进行抗紫外线整理,通过测量涤纶织物的UPF值及紫外线透过率,研究了其抗紫外线效果.结果表明:4只紫外线吸收剂均具有优异的抗紫外线性能.     

UV absorption property of bamboo

This article describes ultra violet (UV) light shielding behaviour of Australian grown bamboo (Phyllostachys pubescens). Optical reflectance showed that untreated bamboo plant has UV absorption properties. To reveal the origin of the UV absorption property, its chemical components were extracted using several polar and non-polar solvents. The extracts in most of the polar and non-polar solvents showed UV absorption property. Protic polar solvents showed better ability to extract UV absorbing chemicals than aprotic and non-polar solvents, except hexane. The chemical components of bamboo were analysed by FT-IR spectroscopy and the findings were correlated with the UV absorbance characteristics. The results confirmed that the UV absorption ability of bamboo originates from nothing but lignin. It is thus indicated that the conventional methods to manufacture bamboo fibres, such as complete degumming or viscose methods, that involve the removal of lignin, cannot retain the unique UV absorption property of bamboo plant in bamboo fibres.     

A novel treatment for multifunctional finishing and reactive dyeing of polyamide‐6–cotton blend

A new approach to simultaneous functional finishing and reactive dyeing of polyamide‐6–cotton fabric (50/50) is developed. The extent of improvement in the functional and dyeing properties is determined by the UV‐absorber, UV‐Sun® CEL, concentration, type and concentration of the used reactive dye as well as the treatment sequence. The UV‐protection and the antibacterial properties, against S. aureus (G+ve) and E. coli (G?ve) bacteria, of the simultaneously finished and dyed fabric samples are maintained even after 15 washing cycles. After 15 washing cycles, the depth of shades and the fastness properties of the obtained dyeings are not seriously affected. The incorporation of the used UV‐absorber onto the blend fibres was also confirmed by SEM analysis.     

Inactivation of Escherichia Coli O157:H7 and Salmonella Enterica on Blueberries in Water Using Ultraviolet Light

Ultraviolet light (UV) has antimicrobial effects, but the shadowing effect has limited its application. In this study, a novel setup using UV processing in agitated water was developed to inactivate Escherichia coli O157:H7 and Salmonella on blueberries. Blueberries were dip‐ or spot‐inoculated with E. coli or Salmonella. Blueberries inoculated with E. coli were treated for 2 to 10 min with UV directly (dry UV) or immersed in agitated water during UV treatment (wet UV). E. coli was most easily killed on spot‐inoculated blueberries with a 5.2‐log reduction after 10‐min wet UV treatment. Dip‐inoculated blueberries were the most difficult to be decontaminated with only 1.6‐log reduction after 10‐min wet UV treatment. Wet UV treatment generally showed higher efficacies than dry UV treatment, achieving an average of 1.4 log more reduction for spot‐inoculated blueberries. For dip‐inoculated blueberries, chlorine washing and UV treatments were less effective, achieving <2 log reductions of E. coli. Thus, the efficacy of combinations of wet UV with sodium dodecyl sulfate (SDS), levulinic acid, or chlorine was evaluated. Inoculated blueberries were UV‐treated while being immersed in agitated water containing 100 ppm SDS, 0.5% levulinic acid or 10 ppm chlorine. The 3 chemicals did not significantly enhance the wet UV treatment. Findings of this study suggest that UV treatment could be used as an alternative to chlorine washing for blueberries and potentially for other fresh produce.