Amphoteric fluorescent whitening agent
A fluorescent whitening agent and fluorescence technology, which is applied in the direction of luminescent/fluorescent substance addition, luminescent materials, bleaching products, etc., and can solve the problems of anion FWA’s fluorescence quenching and disadvantages
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Embodiment 1
[0158]
[0159] 16.7 g of 4,4'-bis[(4-N-morpholino-6-chloro-1,3,5-triazin-2-yl)amino]stilbene- The disodium salt of 2,2'-disulfonic acid was added to 50 ml of 3-N,N-dimethylamino-1-propylamine, and the reaction temperature was raised to 60°C during the addition. The reaction temperature was then further increased to 100°C and the mixture was kept at this temperature for another 1 hour. The heating was then stopped and the mixture was left overnight at room temperature before being diluted with 25ml of water and evaporated in vacuo to about 30g. The obtained residue was dissolved in 50 ml of water, and the pH was adjusted to 1.0 by adding 20 ml of concentrated hydrochloric acid. The pH was then raised to about 5 and the mixture was stirred overnight at room temperature. The precipitated solid was filtered, washed with water and dried under vacuum at 60°C. 14.9 g of the compound of formula (101) was obtained as pale yellow crystals with an active ingredient content of 83%....
Embodiment 2
[0163]
[0164] According to the preparation method similar to the compound (101a) described in Example 1, 8.9 g of 4,4'-bis[(4-bis-(2-hydroxyethyl)amino-6-chloro-1,3,5- Triazin-2-yl)amino]stilbene-2,2'-disulfonic acid disodium salt, at 25°C, add it to 25ml 3-N,N-dimethylamino with stirring for 10 minutes -1-Propanamine, so that the reaction temperature rose to 45°C during the addition. The reaction temperature was then further increased to 100°C and the mixture was maintained at this temperature for an additional 1.75 hours. The heating was then stopped and the mixture was left overnight at room temperature before being diluted with 25ml of water and evaporated in vacuo to about 18g. The resulting residue was diluted with 50 ml of water, and the pH was adjusted to 1.0 by adding 17% aqueous hydrochloric acid. Then 90 ml of acetone were added, so that 2 phases formed. The aqueous phase was separated in a separatory funnel, then 4N aqueous sodium hydroxide was added to rai...
Embodiment 3
[0166]
[0167] The reaction was basically carried out as described in Example 2, except that an equivalent amount of 4,4'-bis[(4-bis-(2 -Hydroxy-n-propyl)amino-6-chloro-1,3,5-triazin-2-yl)amino]stilbene-2,2'-disulfonic acid disodium salt instead of 4,4'-bis[( 4-bis-(2-hydroxyethyl)amino-6-chloro-1,3,5-triazin-2-yl)amino]stilbene-2,2'-disulfonic acid disodium salt, yielding 6.4 g of the formula The compound of (103) as pale yellow crystals.
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