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Fluorescent whitening agent OB is widely used in plastics and paint ink industry because of its excellent whiteness, good compatibility and excellent weather resistance, and is called whitening tiger balm. However, you know, fluorescent whitening agent OB is good, but if it is added in the wrong way, the effect will be greatly reduced. Today, Harvest Chemical will talk to you about the correct addition method of fluorescent whitening agent OB.
All fluorescent whitening agents have a yellowing point, which is also the critical value of the added amount. The relationship between the whitening effect and the amount of fluorescent whitening agent is a parabola. Before the critical value, the higher the amount of fluorescent whitening agent is, the better the whitening effect is. After this point, the more the amount of fluorescent whitening agent is, the yellowing will occur. The addition amount of fluorescent whitening agent OB is between two ten thousandths and five ten thousandths. You can do a proofing test to find out the best addition ratio for your products.
There are two ways to add fluorescent whitening agent OB:
1. Dry whitening. Directly adding fluorescent whitening agent OB powder into plastic raw materials, and then stirring uniformly. This method is simple to operate, but the problem is that the dust is flying and the pollution is serious, so it is not recommended for everyone to use it.
2. Wet whitening. Firstly, the fluorescent whitening agent OB is dissolved in the organic solvent, so that the whitening agent OB can be better dispersed in the plastic raw materials. This method effectively solves the problem of dust and waste, and the mixture is uniform.
Two methods of adding, one thing must be noted, "mix well, mix well, mix well". Say the important thing three times.
20 years experiences textile machine manufacturer and exporter