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纺织品的荧光反响与荧光增白剂,你理解吗


网址:http://www.scvc8.com  时间:2018-11-26 10:35:32

纺织品的荧光反响与荧光增白剂,你理解吗
Do you understand the fluorescent response of textiles and fluorescent whitening agents?
“荧光增白剂”,这个不断处在争议中的物质,关于它能否无害,不断是萦绕在一些人心头的疑问,明天,就让小编带大家起底这个物质,寻根究底地探求下,它的真实面目?
"Fluorescent whitening agent", a substance in constant controversy, is constantly haunting some people's minds about whether it is harmless. Tomorrow, let Xiaobian take up the substance and explore its true face after a thorough investigation.
什麼是荧光增白剂?
What is a fluorescent whitening agent?
荧光增白剂的用处十分普遍,从比较后仅用于纺织品,到如今普遍用于造纸、洗濯剂、塑料、涂料、油墨、皮革等多个范畴。随着经济飞速开展,荧光增白剂的用处与用量仍在不时扩展。目前,纺织工业曾经不是荧光增白剂用量比较大的范畴。在世界各国,荧光增白剂在不同行业的使用比例存在差别,但运用比例的排序根本相反:即次要用于洗濯剂,其次是造纸,纺织第三,塑料及其他范畴的用量较小。
Fluorescent whitening agents are widely used, from textiles to paper making, detergents, plastics, coatings, inks, leather and other fields. With the rapid development of economy, the use and dosage of fluorescent brighteners are still expanding from time to time. At present, the textile industry was not the largest category of fluorescent brighteners. In the world, the proportion of fluorescent brighteners used in different industries is different, but the order of the proportion is basically the opposite: the second is used for detergent, followed by paper making, textile and other areas, the use of plastics and other areas is small.
1.荧光增白剂在纺织品上的增白原理
1. Whitening Principle of Fluorescent Whitener on Textiles
在纺织工业中,纤维本身的白度往往达不到人们审美的要求。尤其是自然纤维,由于生长环境与生长周期不同,其白度差别很大。白色物质普通对可见光中450~480nm的蓝光有细微吸收,而形成蓝色缺乏,使其稍带黄色而给人以陈腐之感。爲此,人们采取了不同措施来使物品增白、增艳。
In the textile industry, the whiteness of the fibers themselves often fails to meet people's aesthetic requirements. Especially for natural fibers, whiteness varies greatly due to the different growth environment and growth cycle. White matter generally has a slight absorption of 450-480 nm blue light in visible light, and forms a lack of blue, which makes it slightly yellow and gives people a sense of staleness. For this reason, people have taken different measures to whiten and brighten the articles.
在荧光增白剂呈现以前,通常采用的增白办法次要有两种:
Before the appearance of fluorescent whitening agent, there are usually two kinds of whitening methods:
加蓝增白法,这种办法可以起到增白作用,但效果无限,而且由于总的反射光量增加,使物品色泽变暗。
Bluish whitening method, this method can play a whitening role, but the effect is infinite, and because the total amount of reflected light increases, the color of the goods becomes darker.
化学漂白法,次要是经过氧化复原反响而使物质褪色,但对纤维素会形成一定的毁坏,而且漂白后的织物常带黄色,反而影响增白效果。
Chemical bleaching, after oxidation and recovery reaction, causes discoloration of the substance, but it will destroy the cellulose to a certain extent, and the bleached fabrics are often yellow, which will affect the bleaching effect.
荧光增白剂可以补偿传统增白办法的缺乏,并显示出宏大的优越性。荧光增白剂能吸收能量较高的近紫外光线,使其分子进入激起态,然后被激分子跃迁到能量较低的基态,并发射出荧光。
Fluorescent whitening agent can compensate for the lack of traditional whitening methods and show great advantages. Fluorescent whitening agent can absorb high energy near-ultraviolet light, make its molecule enter the excitation state, then the excited molecule transits to the ground state with low energy, and emits fluorescence.
荧光增白剂厂家
由于发作了能量损失,辐射的荧光波长变长(大约爲450nm的蓝光),泛黄物品的黄色可以被荧光增白剂反射出来的蓝光补偿,从而添加了物品的表观白度。由于发射光的强度超越了投射于被处置织物上原来可见光的强度,所以发生了略带色光的增白效果。具有适用价值的荧光增白剂,除了吸收紫外光而收回紫蓝色的荧光和具有高的荧光效率外,自身还必需接近无色或微黄色,具有普通染料的特性,对被增白的织物如纤维有良好的亲和力、良好的溶解性或分散功能以及较好的耐洗、耐晒和耐烫等牢度功能。
As a result of the energy loss, the fluorescence wavelength of the radiation becomes longer (about 450 nm blue light). The yellow of yellowish articles can be compensated by the blue light reflected by the fluorescent brightener, thus adding the apparent whiteness of the articles. Because the intensity of the emitted light exceeds the original visible light intensity projected on the disposed fabric, the whitening effect of slightly colored light occurs. Fluorescent whitening agent with applicable value, besides absorbing ultraviolet light and recovering violet-blue fluorescence and having high fluorescence efficiency, must be close to colorless or yellowish, has the characteristics of ordinary dyes, has good affinity to whitened fabrics such as fibers, good solubility or dispersion function, and good resistance to fluorescence. Fastness to washing, sunshine and ironing.
荧光增白剂的增白特性是由其分子的特殊构造决议的。它的发色基团具有可发作π一π*跃迁的共轭体系,比较罕见的这些体系有苯环、萘环、三嗪环、乙烯基、五元杂环和其他一些稠环体系。共轭水平小的电子体系普通只吸收很短波长的光,随着共轭体系增大,可吸收光的波长增大,电子就越容易被激起,增白剂的荧光效率越大,从而满足荧光增白剂的增白要求。
The whitening properties of fluorescent whiteners are determined by the special structure of their molecules. Its chromophores have conjugated systems that can initiate pi-pi* transitions. The most rare systems are benzene ring, naphthalene ring, triazine ring, vinyl, five-membered heterocyclic ring and some other dense ring systems. The electronic system with small conjugation level usually absorbs only very short wavelength light. With the increase of conjugation system, the wavelength of absorbable light increases. The more easily the electrons are stimulated, the higher the fluorescence efficiency of whitening agent is, so as to meet the whitening requirements of fluorescent whitening agent.
光反响与荧光增白剂
Photoresponse and Fluorescent Whitener
荧光反响是指物质承受紫外线不可见光的照射后被激化,然后把被激化的能量转换成肉眼可见的光释出的进程。这是一种光致发光的冷发光景象。
Fluorescence response refers to the process in which a substance is stimulated by ultraviolet invisible light, and then converts the stimulated energy into visible light for the naked eye. This is a photoluminescent and cold-glowing scene.
荧光反响在自然界中极爲罕见,多种植物体(如虾、蟹、水母等),食品(如酱油、普洱茶、白酒、咖啡等),药物,动物提取物(如银杏黄铜、芍药、苦参生物碱等),叶绿素,微生物(细菌、霉菌)在紫外灯照射下都能发生荧光反响,这是自然荧光,是物质固有的特性而且是有害的。
Fluorescence response is very rare in nature. Many kinds of plants (such as shrimp, crab, jellyfish, etc.), food (such as soy sauce, Pu'er tea, liquor, coffee, etc.), medicine, animal extracts (such as ginkgo brass, Paeonia lactiflora, matrine, etc.), chlorophyll, microorganisms (bacteria, fungi) can emit under ultraviolet light. Fluorescence response, which is natural fluorescence, is the inherent characteristics of matter and harmful.
人们日常吸收的作爲养分及维持生命所必需的物质,如维生素A、B2、B12、E,蛋白质,色氨酸、酪氨酸等,也都能发生荧光反响。正常安康的指甲也可有荧光反响景象。
As nutrients and essential substances for life, such as vitamin A, B2, B12, E, protein, tryptophan, tyrosine and so on, fluorescent reactions can also occur. Normal healthy fingernails can also have fluorescent reactions.
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This article is organized by Shandong Jiling Chemical Co., Ltd. http://www.scvc8.com. We will provide you with the latest fluorescent whitening agent news knowledge. Interested friends can pay attention to us, thank you!

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