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为什么过量使用荧光增白剂会降低织物的白度?


网址:http://www.scvc8.com  时间:2019-07-05 16:36:12

  荧光增白剂有很多种。虽然各种增白剂的化学结构和功能不尽相同,但增白纤维或织物的原理是相同的。
  There are many kinds of fluorescent whitening agents. Although the chemical structures and functions of various whitening agents are different, the principles of whitening fibers or fabrics are the same.
  美白原理主要是因为增白剂分子含有共轭双键系统,与优秀的平面性,这种特殊的分子结构在阳光下能吸收阳光,紫外线(300 ~ 400 nm波长)和宣布紫光(波长为420 ~ 500 nm),紫光和黄色光纤维或织物混合而成白光,白色的纤维或织物。
  The whitening principle is mainly because whitening agent molecules contain conjugated double bond system and excellent planarity. This special molecular structure can absorb sunlight in sunlight, ultraviolet (300-400 nm wavelength) and declare purple (420-500 nm wavelength), purple and yellow optical fibers or fabrics are mixed to form white light, white fibers or fabrics.
  含增白剂样品的反射曲线
  Reflection curves of samples containing Whiteners
  荧光增白剂的增白效果只是光学增白和补色,不能代替化学漂白,所以不漂白的织物直接用荧光增白剂进行增白,增白效果并不理想。根据荧光增白剂的原理,增白剂的增白效果主要取决于阳光中紫外线的含量和荧光增白剂在纤维或织物上的浓度。
荧光增白剂厂家
  The brightening effect of fluorescent whitening agent is only optical whitening and complementary color, which can not replace chemical bleaching. Therefore, the non-bleached fabrics are directly whitened by fluorescent whitening agent, and the whitening effect is not ideal. According to the principle of fluorescent whitening agent, the whitening effect of fluorescent whitening agent mainly depends on the content of ultraviolet rays in sunlight and the concentration of fluorescent whitening agent on fibers or fabrics.
  当阳光中uv含量足够时,荧光增白剂对织物的浓度会发生一定程度的变化,随着增白剂浓度的增加,荧光增白剂对织物的增白效果增强。
  When the UV content in sunlight is enough, the concentration of fluorescent whitening agent on the fabric will change to a certain extent. With the increase of the concentration of whitening agent, the whitening effect of fluorescent whitening agent on the fabric will be enhanced.
  但当增白剂的浓度适当的浓度,其比较好的美白效果,可以达到比较高的白度值,如果光亮剂的数量超出比较优浓度,不仅不能改善织物的增白效果而不是下降(即一般织物泛黄、白度下降),目前,增白剂叫增白剂黄点的比较佳浓度。
  But when the concentration of whitening agent is appropriate, its best whitening effect can reach the highest whiteness value. If the amount of brightener exceeds the optimal concentration, it can not improve the whitening effect of fabrics, but not decrease (that is, yellowing and whiteness decrease of general fabrics). At present, the best concentration of whitening agent is called the yellowing point of whitening agent.
  那么,为什么美白效果不再是增强以及增加织物的荧光增白剂浓度,主要原因是:因为织物上的黄灯的力量是有限的,因此抵消黄灯(主波长约为570纳米)需求发出黄色的光吸收紫外线荧光增白剂,光的互补色,紫光是有限的。
  Then, why the whitening effect is no longer to enhance and increase the concentration of fluorescent whitening agent on fabrics, the main reason is: because the strength of yellow light on fabrics is limited, so offset the need of yellow light (main wavelength is about 570 nanometers) to emit yellow light absorption ultraviolet fluorescent whitening agent, complementary color of light, purple light is limited.
  增加荧光增白剂对织物发出的蓝光和紫外光的强度,以抵消织物上的一些黄光。随着黄光强度的逐渐降低,织物变得越来越白。
  Increase the intensity of blue and ultraviolet light emitted by fluorescent whitening agent to offset some yellow light on the fabric. As the intensity of yellow light decreases, the fabric becomes whiter and whiter.
  当织物上的荧光增白剂的浓度添加到适当的浓度(即泛黄的光亮剂),蓝色的强度紫光发出的光亮剂就等于织物上的黄色光的强度,而互相抵消。此时织物也是比较白的,增白剂也是比较好的。
  When the concentration of fluorescent brightener is added to the appropriate concentration (i.e. yellowing brightener), the intensity of blue purple light emits brightener equal to the intensity of yellow light on the fabric, and offset each other. At this time, the fabric is also the whitest, whitening agent is also the best.
  当紫光强度超过抵消织物强度上的黄灯,增白剂通过反射LanZiGuang反映非常明显,同时因为增白剂的各种团体不相同,不同的颜色,如绿色浅紫色,红色,蓝色,等等)是明显的,这两个元素的感应效果,使织物添加灰色的颜色,与添加增白剂的作用浓度和加强,使增白功能下降,虽然此时织物上没有黄色的痕迹,但也不再娇艳夺目,光彩照人。
  When the intensity of purple light exceeds the yellow light which counteracts the strength of the fabric, the brightener reflects very clearly by reflecting LanZiGuang. At the same time, because different groups of brighteners are different, different colors, such as green, light purple, red, blue, etc.) are obvious. The inductive effect of these two elements makes the fabric add grey color, and add whitening agent. The whitening function decreases with the action concentration and strengthening. Although there is no yellow mark on the fabric at this time, it is no longer charming and shining.
  因此,在选择增白剂时,除了考虑其增白效果外,还通过小样本实验,寻找不同增白剂对织物黄变点的影响,以便合理使用,以获得比较佳的增白效果。
  Therefore, in the selection of whitening agent, in addition to considering its whitening effect, small sample experiments were conducted to find out the effect of different whitening agents on the yellowing point of fabrics, so as to achieve the best whitening effect.
  以上是荧光增白剂厂家为大家整理的相关内容,想要了解更多内容,欢迎访问网站:http://www.scvc8.com
  These are the related contents of fluorescent brightener manufacturers for you. For more information, please visit the website: http://www.scvc8.com.

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