fluorescent brightener (fluorescent brightener) is sodium diphenyl disulfonate. It is a fluorescent dye, or white dye, which is also a complex organic compound. Its characteristic is that it can excite the incident light to produce fluorescence, so that the dyed material obtains a sparkling effect similar to fluorite, so that the material seen by the naked eye is very white.

Fluorescent whitening agent is a kind of color conditioner, which has the function of brightening and brightening. It is widely used in many fields such as papermaking, textile and detergent. There are about 15 basic structural types of fluorescent brighteners and nearly 400 structures. There are two types of fluorescent whitening agents allowed in China to be added to laundry detergents: stilbenyl biphenyls (such as CBS, etc.) and ditriazine amino stilbenes.

The principle of fluorescent whitening agent is to absorb the invisible ultraviolet light in the light, and emit visible blue light, and the yellow light emitted by the fabric is superimposed to form a complementary white light, so that the white light emitted by the fabric increases, and the naked eye can feel the white fabric becomes obviously bright white, which is the whitening effect. Fluorescent brighteners can absorb invisible ultraviolet light (wavelength range of about 60-380 nm), convert to longer wavelength blue or purple visible light, thus compensating for the unwanted yellowish color in the matrix, while reflecting more visible light than the original incident wavelength in the 400-600 nm range. So that the products appear more white, brighter, more vivid.

Today, many industries are beginning to use fluorescent whitening agents, such as paper, plastics, leather, detergents. At the same time, fluorescent brighteners are also used in many high-tech fields, such as fluorescence detection, dye lasers, anti-counterfeiting printing, etc., and even high-sensitivity films for aerial photography to improve the sensitivity of sensitive latex will also use fluorescent brighteners.

In China, fluorescent whitening agents are first divided into printing and dyeing auxiliaries, and then divided into dye products. 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 whitening agent is detergent, the second largest user is paper, and textiles are the third largest user.

Fluorescent brightener OB and OB-1, these two seem to be the same as brothers, when I first heard the fluorescent brightener OB and OB-1, I also thought that OB-1 was a combination of OB, and the purity of OB was reduced to OB-1. Because of this misunderstanding and made a lot of jokes. What is the difference between fluorescent whitening agent OB and OB-1, what kind of products to use OB, what kind of products with OB-1 is more suitable? Today I'm going to share it with you.

What is fluorescent whitening agent OB?

Fluorescent whitening agent OB is a milky white powder, its molecular formula is C26H26N2O2S, fluorescent whitening agent has a wide range of applications, fabric whitening is one of them, plastics and other materials have a certain degree of yellow, so that they look dull, in order to increase the brightness of the material, you can add fluorescent whitening agent OB to the plastic, A similar application is made for fabrics, where other colorants are used together with fluorescent whiteners to obtain the desired color and tone in the material. Fluorescent brighteners are easy to use in plastics because they have a high melting point, which helps them mix easily with molten plastics.

What is fluorescent whitening agent OB-1?

The molecular formula of fluorescent whitening agent OB-1 is C28H18N2O2, there are two colors of OB-1, one is yellow, one is green, where the yellow color light is blue violet light, green color light is blue light, most of the plastic industry is used in green OB-1. The whitener OB-1 also has a similar effect to OB, but with different chemical formulas and applications. It can also be used in textiles and plastics to increase the whiteness of the product, and the final whiteness obtained with OB-1 has a light red-blue effect.

What products use fluorescent whitening agent OB, and what products use OB-1 more suitable?

Although they are two different chemicals, from the naming, it can be guessed that the two have many similarities. For example, the scope of application of fluorescent whitening agents OB and OB-1 is very wide, most of the plastic OB and OB-1 can be universal, and the effect of brightening and brightening is obvious. So what's the difference?

Adaptive range

1. Melting point: OB-1>OB

Because the melting point of the fluorescent whitening agent OB is 200 degrees, and the melting point of OB-1 is as high as 360 degrees, this determines that the fluorescent whitening agent OB can not be used for high temperature plastic products, such as air conditioning shells and some kitchenware supplies. So if your product needs to be processed at high temperature, the fluorescent whitening agent OB-1 is your first choice.

2. Dispersion and stability: OB>OB-1

It should be explained that good dispersion means that the product is more soluble and uniform, such as paint ink, which requires high dispersion of fluorescent whitening agent; Good stability refers to the phenomenon that the product is not easy to migrate yellowing in the later period, such as some inferior soles, which are white and clean when they are just bought back, but they become yellow and discolored after a while, which shows that the stability of the fluorescent whitening agent is poor.

It is not that the dispersion and stability of fluorescent whitening agent OB-1 is not good, but relative to OB, it is slightly worse. Because of this difference, Zhe Yuan generally does not recommend the fluorescent whitening agent OB-1 used in ink coatings and soft plastics, OB will be relatively better weather resistance, the product is not easy to appear yellow migration.

Price is the biggest difference between OB and OB-1

In fact, the biggest difference between fluorescent whitening agent OB and OB-1 is the price. Xiaobian remembers that five years ago, the price of fluorescent whitening agent OB and OB-1 was about the same, but later because of environmental rectification, OB raw material supply problems, so that the price of OB soared, OB was more than twice as expensive as OB-1. Because of the huge price difference, customers who can use fluorescent whitening agent OB-1 should try to choose OB-1, and customers with special requirements, such as high-end ink coatings and soft plastics, are recommended to use OB.

Article source: China Research Network, Zhe Yuan, Jingyan Chemical Industry