UV Absorbent UV-326: “Invisible Guardian” of Outdoor Billboards
In today’s era of information explosion, outdoor billboards, as an important part of the city landscape, are not only a powerful tool for commercial publicity, but also a beautiful landscape of modern civilization. However, these seemingly sturdy billboards face many challenges in the sun and rain environment. Among them, ultraviolet rays (UV) are particularly eroded. They are like an invisible blade, quietly cutting the color and structure of billboards. So, how can these outdoor billboards stay bright and stable in the sun? The answer is – UV absorber UV-326.
What is UV absorber UV-326?
UV absorber UV-326 is a highly efficient light stabilizer with a chemical name of 2-(2′-hydroxy-5′-methylphenyl)benzotriazole. It is widely used in plastics, coatings, inks and other fields, especially in the production of outdoor billboards. UV-326 can effectively absorb ultraviolet rays in the wavelength range of 280-340 nanometers and convert them into thermal energy to release, thereby preventing the material from aging or fading due to ultraviolet radiation.
Core functions of UV-326
- UV Protection: UV-326 is like a “sun protection umbrella” that blocks harmful ultraviolet rays for billboard materials.
- Delaying aging: By reducing the damage to polymer materials by ultraviolet rays, it significantly extends the service life of billboards.
- Keep bright colors: Prevent the pigment from fading due to ultraviolet rays, ensuring that the advertising image is always as fresh.
Next, we will explore the application of UV-326 in outdoor billboards from multiple angles and its irreplaceable value.
Basic Characteristics and Parameters of UV-326
To understand why UV-326 is so important, let’s first look at its basic characteristics and technical parameters. Here are the main physical and chemical properties of UV-326:
| parameter name | Value/Description |
|---|---|
| Chemical Name | 2-(2′-hydroxy-5′-methylphenyl)benzotriazole |
| Molecular formula | C15H13NO2 |
| Molecular Weight | 239.27 g/mol |
| Appearance | White to slightly yellow crystalline powder |
| Melting point | 116-118°C |
| Solution | Almost insoluble in water, soluble in organic solvents |
| Absorption wavelength range | 280-340 nm |
| Thermal Stability | It can maintain good UV absorption performance at high temperatures |
Chemical structural characteristics of UV-326
The molecular structure of UV-326 contains benzotriazole rings, which imparts excellent UV absorption capacity. At the same time, the hydroxyl (-OH) and methyl (-CH3) groups in its molecules further enhance their compatibility with polymer substrates, allowing them to be evenly dispersed and functioned in a variety of material systems.
Advantages of UV-326
UV-326 has the following outstanding advantages over other types of ultraviolet absorbers:
- High efficiency: The absorption efficiency of ultraviolet rays is extremely high, and it can achieve ideal protection effect at a low addition amount.
- Stability: UV-326 can maintain stable performance even under high temperatures or long-term exposure to ultraviolet rays.
- Broad Spectrum Applicability: Suitable for a variety of substrates such as polyolefins, polyesters, polyurethanes, etc., with strong adaptability.
- Environmentality: Comply with international environmental standards and is harmless to the human body and the environment.
Principle of application of UV-326 in outdoor billboards
Outdoor billboards are usually made of materials such as plastic, coating or printing ink, which undergo a series of complex chemical reactions under the action of ultraviolet rays, resulting in a degradation of performance. For example, polymer chains in plastics may break, the coating surface may become rough or even crack, while the pigment in the ink will gradually fade. UV-326 solves these problems through the following mechanisms:
1. Absorption and conversion of ultraviolet rays
UV-326 can selectively absorb short-wave portions (280-340 nm) in ultraviolet rays and release the absorbed energy in the form of thermal energy. This process not only prevents the direct damage to the material by ultraviolet rays, but also avoids secondary reactions caused by energy accumulation.
2. Inhibit free radical generation
Ultraviolet radiation can cause free radicals to be produced inside the material, which are one of the key factors in causing aging. UV-326 absorbs ultraviolet rays, reducing the generation of free radicals, thereby delaying the aging rate of the material.
3. Improve overall weather resistance
UV-326 can not only function alone, but also work in conjunction with other light stabilizers (such as hindered amine light stabilizer HALS) to jointly improve the overall weather resistance of the material. This “double insurance” mechanism allows billboards to remain in good condition even in extreme climates.
Example of application of UV-326 in different advertising materials
Due to the diverse materials of outdoor billboards, UV-326 also shows different effects in actual applications. The following are some typical application cases:
1. Application in PVC Advertising Board
PVC (polyvinyl chloride) is one of the commonly used substrates for outdoor billboards, but its weather resistance is poor and it is prone to become brittle and yellow due to ultraviolet rays. After adding UV-326, PVC’s ultraviolet resistance has been greatly improved and its service life can be extended to more than 5 years.
Application Parameters
| Add ratio | Effect Performance |
|---|---|
| 0.3%-0.5% | Significantly improves anti-UV properties, slightly affecting transparency |
| 0.5%-1.0% | Comprehensively improve weather resistance, suitable for long-term outdoor use |
2. Application in coatings
The coating of outdoor billboards often requires good adhesion, wear resistance and weather resistance. UV-326 can be well integrated into the coating formulation, increasing the coating’s resistance to UV rays.
Comparison of experimental data
| Sample number | Whether to add UV-326 | Service life (years) | Chromatic difference change rate (ΔE) |
|---|---|---|---|
| A | No | 2 | 15 |
| B | Yes (0.5%) | 5 | 5 |
From the table above, the coating after adding UV-326 not only lasts longer, but also maintains better color.
3. Application in ink
The picture quality of outdoor billboards directly affects their visual effect, so the choice of ink is particularly important. UV-326 can effectively prevent the pigments in the ink from fading due to ultraviolet rays, ensuring that the advertising image lasts and is clear.
Recommended dosage
| Ink Type | UV-326 recommended addition amount (wt%) |
|---|---|
| Solvent-based ink | 0.2%-0.4% |
| UV curing ink | 0.3%-0.6% |
Progress in domestic and foreign research and market status
In recent years, with the growth of global demand for outdoor advertising, the research and application of UV-326 has also made significant progress. The following are some domestic and foreign research results and market trends worth paying attention to:
Domestic research progress
Chinese scientific researchers have conducted a lot of explorations in the modification and composite application of UV-326. For example, a research team developed a composite light stabilizer based on UV-326 and HALS. The product has better application effect in PP (polypropylene) films than a single component. The relevant results have been published in the journal “Plurimer Materials Science and Engineering”.
International Research Trends
Foreign scholars are paying more attention to the application of UV-326 in new functional materials. For example, a research team from a university in the United States found that introducing UV-326 into biodegradable plastics can not only enhance its weather resistance, but also reduce production costs, providing new ideas for sustainable development.
Market Status
At present, UV-326 has become one of the commonly used ultraviolet absorbers worldwide, and the market size continues to expand. According to statistics, the global UV-326 market demand exceeds 20,000 tons in 2022, and is expected to grow at an average annual rate of 8% in the next few years.
The future development prospect of UV-326
Although the UV-326 has achieved great success, its research and development has not stopped there. In the future, the following directions are worth looking forward to:
- Green: Develop more environmentally friendly production processes to reduce the impact on the environment.
- Multifunctionalization: In combination with other functional additives, develop toolsComposite products with antibacterial and antifouling characteristics.
- Intelligent: Using nanotechnology, design smart materials that can sense ultraviolet intensity and automatically adjust absorption efficiency.
Conclusion
In short, UV absorber UV-326 is an indispensable “invisible guardian” for outdoor billboards. With its excellent UV protection capability and wide applicability, it provides a solid guarantee for the long-term durability of billboards. Whether from a technical level or a market perspective, the UV-326 has shown great potential and value. I believe that in the future, with the continuous advancement of technology, UV-326 will bring us more surprises!
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