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添加荧光增白剂时应留意的事项


网址:http://www.scvc8.com  时间:2018-12-28 11:53:53

添加荧光增白剂时应留意的事项
Notices to be paid attention to when adding fluorescent whitening agent
1.荧光增白剂的增白效果;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。
1. The whitening effect of fluorescent whitening agent; 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;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。
2. The dosage of fluorescent whitening agent; the dosage 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.
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3.塑料配方中颜料对增白效果的影响;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。
3. The influence of pigments on whitening effect in plastics formulation; because the function of fluorescent whitening agent is to convert ultraviolet light into visible blue light or purple light, the components that can absorb ultraviolet light, namely white pigments and ultraviolet wave agents, have the greatest influence on fluorescent whitening agent itself. 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.
4。紫外吸收剂的影响;紫外吸收剂能吸收紫外光,从而降低荧光增白剂的增白效果。荧光增白剂的作用取决于配方中其他颜料和紫外光吸收剂的性质。所以在运用荧光增白剂的制品中,比较好选用不变色的组胺类光波动剂。假如一定要用紫外吸收剂的话,应适当添加荧光增白剂的用量。
4. The influence of ultraviolet absorbent; ultraviolet absorbent can absorb ultraviolet light, thus reducing the whitening effect of fluorescent whitening agent. The effect of fluorescent whitening agent depends on the properties of other pigments and ultraviolet absorbents in the formulation. Therefore, in the use of fluorescent whitening agent products, it is best to choose the color-invariant histamine Light Fluctuating agent. If it is necessary to use ultraviolet absorbent, the dosage of fluorescent whitening agent should be added appropriately.
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The above content is provided by Shandong Jiling Chemical Co., Ltd. Friends interested in fluorescent brightener manufacturers can pay attention to us: http://www.scvc8.com, please look forward to more knowledge.

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