Effect of Application of Selective UV-absorbers/antioxidants on Raw and Bleached Jute Fabrics by Pad-batch-dry Process for Reduction of Its Photo-degradation and Photo-yellowing Character

ABSTRACT

To reduce photo-fading of jute, raw and H₂O₂ bleached jute fabrics have been treated with selective UV-absorbers and antioxidant compounds by pad-batch-dry technique and subjected to photo-exposure in a weather-o-meter for different hours (0–320 h). The corresponding changes in tensile strength and the rate of reduction in whiteness index and rate of increase in yellowness index with consequent changes in K/S value have been evaluated. Among the selected UV-absorbers and antioxidants, sodium azide and LTDP offer good stability against photo-fading, but these treatments are not fast to washing. On the other hand, 1% benztriazole treatment gives medium to good level of resistance against photo-yellowing with reasonable wash fastness. Two percent benztriazole is applied on jute fabric by the pad-batch-dry technique in acidic media (with acetic acid) shows higher stabilization of whiteness retention (i.e. lesser extent of photo-yellowing) under UV-light exposure than other UV-absorbers/antioxidants though is associated with some small loss in tensile strength. The mechanism of possible interaction between benztriazole and major jute constituents has also been established by comparing the reaction with similar model compound (benzaldehyde) in place of reaction between jute–-hemi-cellulose–CHO and benztriazole. UV–VIS spectrophotometric and FTIR analysis undertaken made to support the said reaction mechanism.

摘要

为了减少黄麻的光褪色, 用选择性紫外线吸收剂和抗氧化剂化合物, 通过垫批干燥技术, 对未经处理的黄麻织物和H2O2漂白的黄麻织物进行处理, 并在气象仪中进行不同小时 (0至320小时) 的光照暴露. 评估了拉伸强度的相应变化, 白度指数的降低率和黄度指数的增加率以及K/S值的相应变化. 在选定的紫外线吸收剂和抗氧化剂中, 叠氮化钠和LTDP具有良好的抗光褪色稳定性, 但这些处理不易清洗. 另一方面, 1%苯并三唑处理可提供中等至良好水平的抗光变黄能力, 且具有合理的耐洗牢度. 2%苯并三唑在酸性介质 (含乙酸) 中通过垫批干燥技术应用于黄麻织物, 在紫外光照射下, 与其他紫外线吸收剂/抗氧化剂相比, 显示出更高的白度保持稳定性 (即较小程度的光变黄), 尽管与拉伸强度的一些小损失有关. 通过比较黄麻半纤维素CHO与苯并三唑之间与类似模型化合物 (苯甲醛) 的反应, 建立了苯并三唑与黄麻主要成分之间可能相互作用的机理. 进行了紫外-可见分光光度法和FTIR分析, 以支持上述反应机理.

KEYWORDS:

• Antioxidant
• light fastness rating
• photo-degradation
• photo-fading
• UV-absorber
• UV protection factor

关键词:

• 抗氧化剂
• 耐光性等级
• 光降解
• 照片褪色
• 紫外线吸收剂
• 紫外线防护系数

Disclosure statement

No potential conflict of interest was reported by the author(s).

Supplementary material

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