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Difference Between Optical Brightener and Titanium Dioxide

Feb. 25, 2020

With the continuous improvement of people's living standards, the products that need to be whitened daily are becoming more extensive, and the methods of whitening are becoming more and more diverse. Common whitening methods include fluorescent whitening agent and titanium dioxide whitening. Today, Fluorescent Brightener Agent Manufacturer will show you what is the difference between the two types of whitening methods: fluorescent whitening agent and titanium dioxide.


Whitening principle of optical brightener:

Fluorescent brightener is an organic compound that can improve the whiteness of plastic products, textiles and paper. Commonly known as optical brightener. It is not bleaching and whitening, but absorbs invisible ultraviolet light and converts it into purple-blue fluorescence. It complements the original yellow light radiation to become white light and improves the whiteness of the product under sunlight. Therefore, it is a deceiving one. White light, not the actual product whitening, but has achieved a good whitening effect.


Fluorescent Brightener Agent has been widely used in masterbatches, shoe materials, textiles, paper, laundry detergent, rubber, plastics, pigments and paints. In China, fluorescent brighteners were first classified as printing and dyeing auxiliaries and then as dyes. Due to its unique nature and large amount of demand, it has been separated from the above two industries and has become a separate class of fine chemical products. At present, the largest user of fluorescent brighteners is detergent, the second largest user is paper, the textile is the third largest user, and the fourth largest user is plastic.


Whitening principle of titanium dioxid

Titanium dioxide is a white pigment, which has the functions of reinforcement, anti-aging, and filling. The main application areas of titanium dioxide are coatings, plastics, inks, and papermaking, of which coatings account for 60%, plastics account for 20%, papermaking account for 14%, and other (including Cosmetics, chemical fiber, electronics, ceramics, enamel, electrodes, alloys, glass, etc.) accounted for 6%. Titanium dioxide is added to white and colored rubber products. Under sunlight, it is resistant to sunlight, does not crack, does not change color, has a large elongation, and is resistant to acid and alkali.


Optical Brightener Agent For Plastic

Optical Brightener Agent For Plastic


Secondly, titanium dioxide is also a very good light shielding agent. Rutile (R-type) titanium dioxide has a relative density of 4.26 and a refractive index of 2.72. It can reflect or refract most visible light, and can completely absorb ultraviolet light with a wavelength less than 410 nm. It has good heat resistance and weather resistance. One of the important raw materials for profile weather resistance. Adding titanium dioxide to high-molecular materials will increase viscosity, reduce fluidity, and increase processing torque, making processing difficult. Generally, adding about 5 parts is sufficient, but generally only adding titanium dioxide does not meet the whiteness requirements, so Subon will recommend Customers add a small amount of fluorescent whitening agent.


Fluorescent brightener and titanium dioxide are often used together in the actual production process of many products, and are called golden partners. Titanium dioxide is generally used as the background color for whitening. At the same time, it can also cover some other color components to increase the whiteness. This is an effect that cannot be achieved by optical whitening. It is very good to reach above 80, and the amount is relatively large, about 5 kg per ton of product. Fluorescent brighteners make up for this shortcoming. With a small amount of use, optical whitening is used to whiten the product, and the whiteness value of the product is increased to more than 95, which is also impossible for titanium dioxide.


The above is the difference between the optical brightener and titanium dioxide introduced by Optical Brightener Agent For Plastic supplier.