Zhishang Chemical

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Zhishang Chemical

UV Absorber 326 CAS 3896-11-5

Molecular Formula: C17H18ClN3O

Formula Weight: 315.8

ZSpharmac: UV Absorber 326 Supplier

Product Name: UV Absorber 326
CAS No: 3896-11-5
Purity: 99%

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Basic Info

Product Name:UV Absorber 326
Other Names:UV-326
Place of Origin:Shandong, China
Brand Name:ZSpharmac
Type:Cosmetic Raw Materials
Appearance:Pale Yellow to Light Yellow Solid
EINECS No.:223-445-4
Storage:Sealed in Dry,Room Temperature
Provide:UV Absorber 326 MSDS;
UV Absorber 326 COA

What is UV Absorber 326?

As a light stabilizer, UV Absorber 326 is a representative one among benzotriazole UV absorbers. Its benefits are secure efficiency, low poisoning, solid ultraviolet absorption capability, and can be extensively used in photosensitive products such as shade movie, shade film, color photo paper and high molecular polymer, external safety finishing and many fields. It can efficiently soak up ultraviolet light with a wavelength of 270-380nm. It has a wide range of non-food direct contact permits in polyolefins. It has low volatility at high temperatures and high resistance to thermal degradation. Therefore, it can be used in polyolefins. The decomposition loss is reduced in the process of polymerization and film compression molding. Using ultraviolet protection in polyester resin, this product will not form metal colored salts during the thermalization of the resin.

UV Absorber 326 Property

Melting point 144-147 °C(lit.)
Boiling point 460.4±55.0 °C(Predicted)
density 1.26±0.1 g/cm3(Predicted)
vapor pressure 0Pa at 20℃
storage temp. Sealed in dry,Room Temperature
solubility Chloroform (Slightly), Ethyl Acetate (Slightly), Methanol (Slightly)
form Solid
color Pale Yellow to Light Yellow
Water Solubility 4μg/L at 20℃


Application of UV Absorber 326

  1. UV Absorber 326 is a benzotriazole light stabilizer, 2′-(2′-hydroxy-3′-tert-butyl-5′-methylphenyl)-5-chlorobenzotriazole. UV-326 can absorb 280-370nm ultraviolet rays, has good stability, low toxicity, and no stimulation to the human body. It is widely used in coatings, synthetic rubber, synthetic fibers, photosensitive materials, etc., and can effectively improve the light resistance of these materials and reduce the risk of damage. Yellowing, aging and other phenomena caused by ultraviolet rays in the sun.
  2. UV Absorber 326 is generally made use of in polyvinyl chloride, polystyrene, unsaturated resin, polycarbonate, polymethyl methacrylate, polyethylene, abdominal material, epoxy material, and so on.

Preparation of UV Absorber 326

Diazotization reaction: Weigh 6g of 98wt% H2SO4, 50ml of water and 0.03mol of p-chloro-o-nitroaniline into the reaction kettle. When cooling to 5°C, slowly add 15g of 20wt% NaNO2 solution dropwise, and continue stirring for 1h until the reaction is completed. Add urea to decompose residual nitrous acid, and filter to remove residue.

Coupling reaction: Weigh 0.03mol 2-tert-butyl-p-cresol, 50mL water, and 0.1g sodium dodecylbenzenesulfonate into the reaction kettle, stir to form a uniform white emulsion. Adjust the pH to 7-9, and add the above-mentioned diazonium salt solution dropwise within 2 hours under this weak alkaline condition. After the reaction, filter, wash, dry and weigh.

Glucose reduction reaction: Weigh 0.015mol of the product obtained from the diazo coupling reaction, 10g of NaOH solution

(20wt%) was added to the reaction kettle, and when the temperature was 50°C, 100ml of 30wt% glucose solution was slowly added dropwise, and the reaction was continued for 1h. After cooling, it was filtered and drained to obtain the nitrogen oxide intermediate.

Reduction reaction of zinc powder: add 17mL of chlorobenzene and 42g of 14wt% H2SO4 to the nitrogen oxide, and heat to 90°C. Add 1.1g of zinc powder in batches within 2 hours, add activated carbon after the reaction is complete, and filter while hot after stirring for 0.5 hours. The analysis results showed that the yield of the product was 90.9%, and the purity was 99.3%.

Production of UV Absorber 326

The production process of UV Absorber 326 is that 4-chloro-2-nitroaniline (1) is diazotized with sodium nitrite (2) and sulfuric acid and then mixed with 2-tert-butyl-4-methylphenol (3) Perform a coupling reaction to produce 2-nitro-4-chloro-2′-hydroxy-3′-tert-butyl-5′-methylazobenzene (4). (1), (2), (3) The molar ratio is: 1:1.04:1.18. (4) is reduced to 2-(2′-hydroxyl-3′-tert-butyl-5′-methylphenyl)-5-chlorobenzotri Azole nitrogen oxide (5), and finally reduction with zinc powder (5) to produce the final product 2-(2′-hydroxy-3′-tert-butyl-5′-methylphenyl)-5-chlorobenzotri Azole (6) (UV Absorber 326). UV Absorber 326 is an excellent light stabilizer for polyolefin, ABS, polyester and other resins, and has a synergistic effect with hindered amine light stabilizers (HALS).

About Products:
If you need UV Absorber 326 as a cosmetic raw material, please contact our service staff directly, we will provide you with high-quality products at the best price.
As an experienced UV Absorber 326 manufacturer and supplier, ZSpharmac will provide UV Absorber 326 raw materials to customers all over the world for a long time.
Over the years, the company has been adhering to the spirit of “integrity management, strict quality control, customer first”, and has won unanimous praise from domestic and foreign customers.

Company Profile and Corporate Culture

Company Profile:

ZhiShang Chemical is owned by ZhiShang Group is a professional new-type chemicals enterprise combined into research and development, production and sales .

The company’s competitive product is pharmaceutical raw materials and intermediates (especially carbohydrate derivatives Series), In recent years, the company has made a major breakthrough in food and feed additives, plant extraction, industrial chemicals industry .

The company insists on the spirit of “sincere management, strict quality control, customer as god” , get consistent high praise from customers at home and abroad.

Corporate Culture:

Help China Chemicals to benefit the happiness of human life
Become the most trusted chemical supplier in the world
Striver – oriented, enrich employees, customer first, deep service, seek development
Be prepared for danger in times of peace, forge ahead actively, unity and cooperation, and be brave to fight

About Us

The production base is located in Zhangqiu chemical industry park and Tai’an high-tech chemical industry park. laboratory and workshop in strict accordance with the GMP standard and the product fit national ISO9001 and ISO2000 standards.

“Zhishang” products are exported to Europe, North and South America, the Middle East, Asia Pacific and Africa area, so as to establish a long-term and stable cooperation relationship with customer in the world.

Company Info
  • Business Type: Manufacturer
  • Product Range: Cosmetic raw materials
  • Products/Service:Cosmetic raw materials (flavors and fragrances,antioxidant products, moisturizing and hydrating, whitening agents, cosmetic additives)
  • Total Employees: 51~100
  • Capital (Million US $): 10000000RMB
  • Year Established: 2016
Production Capacity
  • No. of Production Lines : 8
  • No. of QC Staff : 5 -10 People
  • OEM Services Provided : yes
  • Factory Size (Sq.meters) : 3,000-5,000 square meters
  • Certificate: ISO9001 , CE , GMP , API , MSDS
  • Factory Location : Diao Town Industry Park, Zhangqiu City, Jinan City, Shandong Province, China.


Pre-Sales Service

* Prompt reply and 24 hours online, professional team to provide best price and high quality product.

* Sample testing support.

* Every batch of products will be tested to ensureits quality.

*The packing also can be according the customers` requirment.

*Any inquiries will be replied within 24 hours.

*we provide Commerical Invoice, Packing List, Bill of loading, COA , Health certificate and Origin certificate. If your markets have any special requirements, let us know.


After-Sales Service

*The fact of logistics information monitoring.

* Any questions about the product can be consulted at any time.

*Product has any problem can return.


Do you accept sample order?

We will make samples before mass production, and after sample approved, we’ll begin mass production. Doing 100% inspection during production, then do random inspection before packing.



You can get free samples for some products,you only need to pay the shipping cost or arrange a courier to us and take the samples. You can send us your product specifications and requests,we will manufacture the products according to your requests.

What’s your MOQ?

Our MOQ is 1kg. But usually we accept less quantity such as 100g on the condition that sample charge is 100% paid.

Do you supply product report?

Yes. We’ll give you product analysis report before shipping.

  Is there a discount?

Different quantity has different discount.


1. ≤50kg, Express delivery recommended, usually called as DDU service;

2. ≤500kg, Air shipping recommended, usually called as FOB, CFR, or CIF service;

3. >500kg, sea shipping recommended, usually called as FOB, CFR, or CIF service;

4. For high value products, please select air shipping and express delivery for safe.

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