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Matters Needing Attention When Using Fluorescent Whitening Agent

Oct. 25, 2019

The whitening effect of the fluorescent whitening agent is usually expressed by whiteness, which is related to the compatibility of the resin and the light resistance of the plastic, in addition to the amount of the fluorescent whitening agent added. The fluorescent whitening agent with good compatibility and good light resistance has good whitening effect and long-lasting effect. A direct and effective method for testing the whitening effect of fluorescent whitening agents is to perform a small sample experiment. So what should you watch out for when using fluorescent whitening agents? Optical Brightener Agent Professional Producer will come to tell you.

Fluorescent Brightener For Detergent

Fluorescent Brightener For Detergent

The first is the amount of fluorescent whitening agent. The amount of fluorescent whitening agent is usually expressed as a percentage of the mass of the plastic. The amount of fluorescent whitening agent in the plastic is related to its chemical structure, dispersion, and the nature of the plasticizer or other additive in the plastic formulation. The amount of fluorescent whitening agent is generally 0.05% to 0.1% (weight for plastic), for ultra-white varieties, the dosage can reach 0.5% (weight for plastic) or more; for transparent plastic, the amount It is 1/100~1/10 of the above dosage. The appropriate dosage should be determined by the sample test to meet the application requirements. It is not the case that the more the fluorescent whitening agent is used, the better the whitening effect is, but there is a certain concentration limit, exceeding a certain limit. Not only does it have no whitening effect, but it can even appear yellow. Excessive amounts of fluorescent whitening agents can also cause incompatibility, migration, and reduced aging resistance. It can be compounded with two or more different fluorescent whitening agents. If properly selected, the fluorescence spectrum will be broadened, the fluorescence intensity will be enhanced, and the synergistic effect will be achieved, and the application performance will be improved.

Since the function of the fluorescent whitening agent is to convert the ultraviolet light into visible blue or violet light, the components which can absorb ultraviolet light, that is, the white pigment and the ultraviolet light stabilizer, are greatly affected by the fluorescent whitening agent itself. Titanium dioxide in white pigment can absorb the 380nm light wave in ultraviolet light. If it is present in plastic products, it will reduce the whitening effect of fluorescent whitening agent. For example, Optical Brightener For Plastic Factory should pay attention to reduce white pigment. . Because different crystal forms of titanium dioxide absorb different light waves at 380 nm, anatase can only absorb 40% of 380nm light; rutile type can absorb 90%. If titanium white powder is used together with fluorescent whitening agent, it should be selected as anatase. Type titanium dioxide and appropriately increase the amount of fluorescent whitening agent.

White pigments vary depending on how much UV light they absorb. The ultraviolet light that can act on most of the fluorescent whitening agents is also absorbed by the anatase and rutile titanium dioxide. Zinc sulfate has a slightly lower absorption capacity for this part of the ultraviolet light. This difference is manifested in a molded article colored with a white pigment containing an optical brightener. In the case where the concentration of the fluorescent whitening agent is the same, generally, the white color achieved with zinc sulfate is strong, and when the rutile titanium dioxide is used, the white color is weak. Under certain conditions, with rutile pigments, the degree of whiteness cannot be significantly improved. If you need to increase the whiteness, you should increase the concentration of the fluorescent whitening agent. For example, in a polyethylene formulation, a white effect can be obtained immediately with 2.0% rutile pigment and 0.2% fluorescent whitening agent, or 5% anatase pigment and 0.05% fluorescent whitening agent.

These are the issues that should be noted when using fluorescent whitening agents. If you are interested in fluorescent whitening agents, you can contact us and we can provide you with a variety of fluorescent brighteners including Fluorescent Brightener For Detergent. White agent, welcome to your arrival.