UV absorber UV-326: The Guardian of Textile Color Stability

On sunny days, we always like to wear brightly colored clothes and enjoy the beauty of nature. However, as time goes by, those once bright and dazzling clothes gradually fade and lose their original charm. The “culprit” behind this is the ultraviolet ray – a high-energy radiation band in the sun’s light. It not only hurts our skin, but also causes irreversible damage to the color of textiles. Fortunately, scientists have developed a powerful “protective shield” – the ultraviolet absorber UV-326 (hereinafter referred to as UV-326), which provides reliable guarantees for the color stability of textiles.

This article will start from the harm of ultraviolet rays and deeply explore the working principle, product parameters and its application methods in textiles. It will combine domestic and foreign literature and experimental data to comprehensively analyze how this magical substance becomes the guardian of textile color stability. At the same time, we will present key data in the form of a table to help readers understand the advantages and characteristics of UV-326 more intuitively. Whether you are a practitioner in the textile industry or an ordinary reader interested in chemical materials, this article will unveil the mystery of UV-326 for you.

UV: Invisible Killer of Textile Color

Basic concept of ultraviolet rays

Ultraviolet rays are a radiation band in the electromagnetic spectrum with wavelengths between 10 nanometers and 400 nanometers, and are divided into three types: UVA (315-400 nanometers), UVB (280-315 nanometers) and UVC (100-280 nanometers). Among them, UVC is completely absorbed by the ozone layer in the atmosphere and therefore does not reach the earth’s surface; while UVA and UVB can penetrate the atmosphere and act directly on the surface of the object.

For textiles, the harm of ultraviolet rays is mainly reflected in two aspects: one is to cause fiber aging, making the fabric fragile and easy to lose; the other is to trigger the photodegradation reaction of dye molecules, thereby fading or discoloring of the textile. This phenomenon is called “light fading” and is the main reason why many textiles lose their color charm.

Chemical mechanism of light fading

The essence of light fading is a complex photochemical reaction process. When ultraviolet rays irradiate on textiles, dye molecules will absorb ultraviolet light of a certain wavelength and enter the excited state. If dye molecules cannot effectively release excess energy, electron transitions or molecular bond breaks may occur, resulting in new chemical structures. These new structures often do not have the original optical properties, causing the color to change or disappear.

For example, azo dyes are prone to breaking nitrogen-nitrogen double bonds under the action of ultraviolet rays, forming colorless aromatic amine compounds. Anthraquinone dyes may lose their color due to the damage of the ring structure. In addition, some dyes can cross-react with other components in the fiber, further aggravating the fadingColor phenomenon.

To address this problem, scientists have developed a variety of light stabilizers, among which UV absorbers are highly favored for their high efficiency and wide applicability. As a leader in this type of product, UV-326 has become an important tool in the textile industry with its outstanding performance.

UV-326: Star products of UV absorbers

What is UV-326?

UV-326 is a highly efficient ultraviolet absorber, chemically named 2-(2′-hydroxy-5′-methylphenyl)benzotriazole. Its molecular formula is C15H11NO2 and its molecular weight is 241.25 g/mol. As an organic compound, UV-326 has good thermal stability and hydrolysis resistance, and can maintain excellent performance under various conditions.

The main function of UV-326 is to protect textiles from UV rays by absorbing UV rays and converting them into harmless thermal energy. This transformation process does not affect the color of the textile nor significantly change its physical properties, so it is ideal for occasions where color stability is required for a long time.

UV-326 product parameters

The following are some key parameters of UV-326:

As can be seen from the table, UV-326 has a wide absorption wavelength range (270-380 nanometers) and is able to cover most of the UV bands. At the same time, its high thermal decomposition temperature also ensures its stability under high temperature processing conditions.

How to work in UV-326

Absorption and Conversion: “Silencer” of UV rays

The core function of UV-326 is to absorb ultraviolet rays and convert them into harmless thermal energy. Specifically, when ultraviolet rays irradiate on UV-326 molecules, the benzotriazole groups in the molecule preferentially absorb ultraviolet light of a specific wavelength. The absorbed energy is then released in the form of thermal energy through vibration and rotation within the molecule, rather than triggering chemical reactions or photodegradation processes.

This energy conversion mechanism can be vividly compared to a “silencer”. Just as the silencer on the exhaust pipe of a car can convert noise into heat, the UV-326 also converts the energy of ultraviolet rays into heat, thus avoiding the destruction of dye molecules.

Advantages of Molecular Structure

The molecular structure of UV-326 provides strong support for its efficient performance. Its core part is a benzotriazole ring, which has strong UV absorption capacity. In addition, the molecule also contains a hydroxyl group (-OH) and a methyl group (-CH3), which enhance the solubility and antioxidant properties of the molecule respectively.

Study shows that the absorption efficiency of UV-326 is closely related to its molecular arrangement. When UV-326 is evenly dispersed in textiles, each molecule can maximize its absorption capacity, thereby achieving optimization of overall performance.

Application of UV-326 in textiles

Application Method

UV-326 can be applied to textiles in a variety of ways, mainly including the following:

1. Immersion method: Soak textiles in a solution containing UV-326 to fully adsorb to the fiber surface.
2. Coating method: mix UV-326 with other additives and apply it to the surface of the textile to form a protective film.
3. Blending method: UV-326 is directly added to the polymer raw material during spinning to make fibers with ultraviolet protection function.
4. Post-tissue method: After the textile production is completed, UV-326 is applied to the finished product by spraying or rolling.

Each method has its own unique advantages and applicable scenarios. For example, the impregnation method is simple to operate and is suitable for mass production; while the blending method can provide a more lasting effect, but it is relatively expensive.

Experimental verification: Evaluation of UV-326

To verify the actual effect of UV-326, the researchers conducted a series of comparative experiments. The following is a typical set of experimental data:

It can be seen from the table that under the same exposure conditions, the fading degree of sample B with UV-326 added is only about one-quarter of that of sample A without sample A, which fully proves the effectiveness of UV-326.

Progress in domestic and foreign research

Domestic research status

In recent years, domestic scholars have made significant progress in research on UV-326. For example, a research team of a university analyzed the use effect of different concentrations of UV-326 and found that the optimal addition amount was about 0.5%-1.0% of the weight of the textile. In addition, research has pointed out that when UV-326 is used in conjunction with antioxidants, it can further improve the photo-resistant aging performance of textiles.

International Research Trends

In foreign countries, the application of UV-326 is more extensive. Some internationally renowned brands have included it in standard production processes. For example, a European textile company has developed a new functional fabric based on UV-326, which not only has excellent UV protection capabilities, but also can effectively resist fading caused by washing and friction.

Conclusion: Future Outlook of UV-326

As people attach importance to environmental protection and sustainable development, the application prospects of UV-326 are becoming more and more broad. In the future, researchers will further optimize their preparation processes, reduce production costs, and explore more innovative application areas. Whether it is outdoor sportswear, car interior, or home decoration, UV-326 will become a reliable guarantee for their color stability.

Let us look forward to this little white powder to continue to create more miracles for us in the days to come!

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