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荧光增白剂的留意事项


网址:http://www.scvc8.com  时间:2018-12-13 11:40:45

荧光增白剂的留意事项
Notes on Fluorescent Whitener
1.荧光增白剂的增白效果
1. Whitening effect of fluorescent whitening agent
增白效果常用白度表示,它除了与荧光增白剂的添加量有关外,还与树脂的相容性及塑料的耐光性有关。相容性好,耐光性好的荧光增白剂其增白效果好且耐久。检验荧光增白剂增白效果的比较间接无效的办法是停止小样实验。
The whitening effect is usually expressed by whiteness, which is related not only to the amount of fluorescent whitening agent added, but also to the compatibility of resin and the light resistance of plastics. Fluorescent whitening agent with good compatibility and light resistance has good whitening effect and durability. The most indirect and ineffective way to test the whitening effect of fluorescent whitening agent is to stop the small sample experiment.
2.荧光增白剂的用量
2. The dosage of fluorescent brightener
荧光增白剂的用量常用其绝对于塑料质量的百分数表示。荧光增白剂在塑料中的用量与其化学构造、分散度以及塑料配方中的增塑剂或其他添加剂的性质有关。荧光增白剂的用量普通爲0.05%~0.1%(对塑料重),关于超白种类,用量可达0.5%(对塑料重)或更多;关于通明塑料,其用量则爲上述用量的1/100~1/10。适宜的用量应经过小样实验来确定,以满足使用要求爲准绳,并不是在什麼状况下荧光增白剂的用量越多增白效果越好,而是有一定的浓度极限,超越某一极限值,不但没有增白效果,甚至还会呈现发黄景象。过高的荧光增白剂用量还会惹起不相溶,发作迁移景象,抗老化功能降高等。
The amount of fluorescent whitening agent is usually expressed by its absolute percentage of plastics quality. The dosage of fluorescent whitening agent in plastics is related to its chemical structure, dispersion and the properties of plasticizer or other additives in plastics formulation. The dosage of fluorescent brightener is usually 0.05%-0.1%(for plastic weight). For super-whitening type, the dosage can reach 0.5%(for plastic weight) or more; for clear plastics, the dosage is 1/100-1/10 of the above dosage. Suitable dosage should be determined by a small sample experiment to meet the use requirements as the criterion. It is not that the more the dosage of fluorescent whitening agent, the better the whitening effect, but that there is a certain concentration limit, beyond a certain limit, not only no whitening effect, but also a yellowing scene. Excessive dosage of fluorescent whitening agent can also cause incompatibility, migration and aging resistance.
荧光增白剂厂家
采用两种或两种以上不同的荧光增白剂复配,如选择适宜,会使荧光光谱变宽,其荧光强度加强,到达增效的目的,同时改善其使用功能。
If two or more different fluorescent whitening agents are used, the fluorescence spectrum will be broadened, the fluorescence intensity will be strengthened, the purpose of synergism will be achieved, and the use function of fluorescent whitening agents will be improved at the same time.
3.塑料配方中颜料对增白效果的影响
3. The influence of pigments in plastics formula on whitening effect
由于荧光增白剂的作用是将紫外光转化爲可见蓝光或紫光,因此对荧光增白剂自身影响比较大的就是那些能吸收紫外光的成分,即白色颜料和紫外光波动剂。白色颜料中的钛白粉由于能吸收紫外光中的380nm光波,若存在于塑料制品中就会降低荧光增白剂的增白效果。由于不同晶型的钛白粉对380nm光波的吸收量不同,锐钛型只能吸收40%380nm的光;金红石型则可吸收90%,假如将钛白粉与荧光增白剂合用,应选用锐钛型钛白粉并适当添加荧光增白剂用量。
Because the function of fluorescent brighteners is to convert ultraviolet light into visible blue light or purple light, the components that can absorb ultraviolet light, namely white pigments and ultraviolet fluctuants, have the greatest influence on the fluorescent brighteners themselves. Titanium dioxide in white pigments can absorb 380 nm ultraviolet light. If it exists in plastic products, it will reduce the whitening effect of fluorescent whitening agent. Because different crystal forms of titanium dioxide absorb 380 nm light wave differently, anatase type can only absorb 40% 380 nm light; rutile type can absorb 90%. If titanium dioxide and fluorescent whitening agent are combined, anatase type titanium dioxide should be selected and fluorescent whitening agent dosage should be added appropriately.
白色颜料依其吸收紫外光的多少而各不相反。能对大少数荧光增白剂起作用的那一区域的紫外光,也正是锐钛型和金红石型钛白粉所吸收的。而硫酸锌对这局部紫外光的吸收才能稍差一些。这种差异,在用含有荧光增白剂的白色颜料着色过的模塑制品中表现得比较爲分明。在荧光增白剂浓度相反的状况下,普通说来,用硫酸锌时所到达的白色比较强,而用金红石型钛白粉时白色比较弱。在某些条件下,用金红石型颜料,不能使白色水平明显地进步。若需求进步白色水平,应增大荧光增白剂的浓度.例如在聚乙烯配方中,用2.0%的金红石型颜料和0.2%的荧光增白剂,或许用5%的锐钛型颜料和0.05%的荧光增白剂,立即就能失掉白色效果。
White pigments vary according to how much ultraviolet light they absorb. The ultraviolet light in the region where most fluorescent whiteners work is also absorbed by anatase and rutile titanium dioxide. Zinc sulfate absorbs less ultraviolet light than zinc sulfate. This difference is most evident in moulded products colored with white pigments containing fluorescent whitening agents. In the case of the opposite concentration of fluorescent whitening agent, generally speaking, the white reached by zinc sulfate is the strongest, while the white reached by rutile titanium dioxide is the weakest. Under certain conditions, the use of rutile pigments can not make a significant improvement in the white level. If the white level needs to be improved, the concentration of fluorescent whitening agent should be increased. For example, in polyethylene formulation, using 2.0% rutile and 0.2% fluorescent whitening agent, perhaps using 5% anatase and 0.05% fluorescent whitening agent, the white effect can be lost immediately.
更多的关于荧光增白剂厂家的问题或者详细的内容,请关注我们山东吉凌化工178彩票注册的网站:http://www.scvc8.com谢谢!!
More questions or details about the manufacturers of fluorescent brighteners, please pay attention to our website of Shandong Jiling Chemical Co., Ltd. http://www.scvc8.com, thank you!

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