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Powder Purity 99% Optical Brightener EBF ISO14001 CAS No 2866-43-5
Product Details
Mat no.10010019 Fluorescent Brightener 185 CAS No.2866-43-5 Optical brightener EBF Light yellow Powder Purity≥99%
| English synonyms | 2,2'-(2,5-thiophenediyl)bis-benzoxazole ; 2,5-di(benzoxazol-2-yl)thiophene ; 2,5-Bis(2-benzoxazolyl)thiophene ; fluorescent brightener 185 ; CI Fluorescent Brightener 172 ; ci 515240 ; 2,2'-thiophene-2,5-diylbis(benzoxazole) ; Benzoxazole, 2,2-(2,5-thiophenediyl)bis- |
| CAS No. | 2866-43-5 |
| Molecular formula | C18H10N2O2S |
| Molecular weight | 318.35 |
| EINECS number | 220-685-1 |
| Melting point | 216-220°C |
| Boiling point | 466.4±30.0 °C(Predicted) |
| density | 1.385 |
| Refractive index | 1.6000 (estimate) |
| Acidity coefficient (pKa) | 1.27±0.10(Predicted) |
| Water solubility | 9.551ug/L(25 ºC) |
| EPA chemical substance information | 2,5-Bis(2-benzoxazoyl)thiophene (2866-43-5) |
| Chemical nature | This product is light yellow crystalline powder with bright blue fluorescence. Melting point 218 ~ 219 ℃. It can be miscible with water in any proportion. Resistant to hard water, acid and alkali. The fabric treated with it has good sun fastness, chlorine bleaching resistance and washing fastness. |
| use |
This product is used as a whitening agent for vinegar fiber, nylon, polyester, polypropylene, nylon and blended fiber. It is mainly used for commercial whitening agent EB, and can also be used for whitening and brightening of various polyolefin plastics, BS engineering plastics, plexiglass, etc |
| production method | Synthesis of 2-chloromethylbenzoxazole (the feed is mass fraction) put 54.5 parts of o-aminophenol and 220 parts of chlorobenzene into the reactor, stir to form a suspension, and add 0.6 parts of catalyst pyridine. Under nitrogen protection and stirring, drop 20.0 parts of 2-chloroacetyl chloride, heat it to 80 ℃ after dropping, gradually heat it to 100 ℃ in the reaction, keep it warm for 2h, add 3 parts of O-Toluenesulfonic acid, and continue nitrogen filling protection, Stir and heat under reflux for 5h. The chlorobenzene was evaporated to obtain a brown oil, 2-chloromethylbenzoxazole. Synthesis of bis (benzoxazole-2-methyl) sulfide 63 parts of sodium sulfide were put into the reactor, 3 times of water was added, stirred and dissolved. Then 0.8 parts of benzyl n-tributylammonium bromide was added. It was cooled to 10 ℃ α- Chloromethyl benzoxazole is added with dichloromethane to form a solution. Then drop the solution into the sodium sulfide solution, react for 3h, stand still, discard the water layer, wash the organic layer to neutral, stir and mix the dried sodium sulfate with the washed organic matter, dehydrate, and then filter out the sodium sulfate. The filtrate is evaporated to dichloromethane under vacuum. Cooling crystallization and recrystallization with methanol. Pure bis (benzo [oxazole-2-methyl) sulfide was obtained. For the formation of brightener EBP, sodium methoxide solution was prepared from metal sodium and anhydrous methanol. The solution was cooled to 0 ℃ and stirred with glyoxal for 4H to gradually form crystalline precipitation, i.e. 2,5-dibenzo [oxazole] Oxazolylthiophene is neutralized with dilute acid, filtered, the filter cake is washed to neutral with water, and then vacuum dried to obtain the crude product of whitening agent EBF. Then recrystallized in chlorobenzene to obtain fine products. |
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