Molecular Formula | C20H24ClN3O | |||||||||||
Molar Mass | 357.88 | |||||||||||
Density | 1,26 g/cm3 | |||||||||||
Melting Point | 150-153°C(lit.) | |||||||||||
Boling Point | 469.2±55.0 °C(Predicted) | |||||||||||
Flash Point | 234°C | |||||||||||
Solubility | Chloroform, Ethyl Acetate (Slightly), Methanol (Slightly) | |||||||||||
Vapor Presure | 2E-09mmHg at 25°C | |||||||||||
Appearance | Solid | |||||||||||
Color | Off-White to Pale Yellow | |||||||||||
pKa | 9.23±0.48(Predicted) | |||||||||||
Storage Condition | Keep in dark place,Sealed in dry,Room Temperature | |||||||||||
Refractive Index | 1.596 | |||||||||||
MDL | MFCD00059706 | |||||||||||
Physical and Chemical Properties |
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Use | Especially suitable for polyethylene and polypropylene, but also for polyoxymethylene, polymethyl methacrylate, polyurethane and a variety of coatings |
Hazard Symbols | Xi - Irritant |
Risk Codes | 36/37/38 - Irritating to eyes, respiratory system and skin. |
Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36 - Wear suitable protective clothing. |
UN IDs | 3077 |
WGK Germany | 2 |
RTECS | 3425000 |
TSCA | Yes |
HS Code | 29339900 |
Hazard Class | 9 |
Reference Show more | 1. [IF=2.908] Xuetao Zhang et al."Self-diffusion method for broadband reflection in polymer-stabilized cholesteric liquid crystal films."Liquid Crystals. 2021 Sep 23 |
This product is non-toxic, non flammable, non corrosive, and stored and transported under dry, ventilated, and low temperature conditions.
1. Preparation of 2,4-di-tert-butylphenol
After adding phenol to the reactor for melting, isobutylene and sulfuric acid are added under stirring, and the temperature is raised to about 70 ℃ for alkylation reaction. After the reaction is completed, distillation is carried out to obtain 2,4-di-tert-butylphenol.
2. Diazotization of p-chloro-o-nitroaniline
Add para chloro ortho nitroaniline and hydrochloric acid to the reactor, stir and dissolve, and cool to 0~5 ℃. Slowly add the prepared 25% -30% sodium nitrite solution to the kettle and maintain it below 5 ℃ for reaction. After testing, when the potassium iodide starch test paper appears blue, it indicates that diazotization has reached the endpoint. The product is p-chloro-o-nitrobenzene diazonium hydrochloride.
3. Coupling reaction
Add the prepared 2,4-di-tert-butylphenol and p-chloro-o-nitrobenzene diazonium hydrochloride to the reactor, and add a sodium hydroxide methanol solution under stirring for coupling reaction. The temperature is controlled at 0-5 ℃. When the alkalinity in the reaction material no longer decreases, the reaction is stopped and filtered to obtain the coupling product.
4. Reduction reaction
Add the coupling product to the reaction kettle, then add an appropriate amount of ethanol, stir evenly, raise the temperature to 40-45 ℃, and slowly add zinc powder under strong stirring for reduction reaction. After the reaction is complete, it is dropped to room temperature and an appropriate amount of water is added. 2- (2 '- hydroxy-3', 5 '- di-tert-butylphenyl) -5-chlorobenzotriazole is crystallized and precipitated, and the crude product is obtained through filtration.
5. Refining treatment
Add ethyl acetate to the crude product, stir and heat until the product is completely dissolved. Filter while hot, remove insoluble substances, cool the filtrate to room temperature for crystallization, and then filter. Recycle ethyl acetate from the filtrate, wash and dry the filter cake with water to obtain the finished product.