| 2,4-dihydroxybenzophenone(UV-0),2-Hydroxy-4-methoxybenzophenone(UV-9)and 2-(2′-hydroxy-3′- chloroetheneacyl-5′-methphenyl) benztriazole(UV-P) have been widely adopted in plastic products, cosmetic and textile finishing agentas low cost, and good ultraviolet absorption in the range form 200 to 400nm. However, with the improvement of industrialization and people's living standard , the Applied Limitation is more and more outstanding. These ultraviolet absorbers have weakness including bad compatibility with cosmetics, being hard to dissolve in water and easy to be absorbed by human bodies through skin and so forth. Based on the weaknesses of UV-0,UV-9 and UV-P, this paper by molecule structure designing, in this paper ,UV-0,UV-9 and UV-P have been successfully grafted with polyethylene glycol and polymethylene glycol methyl ether or carboxymethyl chitosan to improve the water-solubility of the ultraviolet absorbers and to further expand their application, fields.Firstly, the paper studied the synthesis of reactive intermediates containing benzophenone and benztriazole. UV-0, UV-9 and UV-P reacted with chloracetyl chloride orepichiorohydrin by esterification, etherification and Fries rearrangement, to product three intermediates containing benzophenone: 2- Hydroxy -4- chloroacetate benzophenone(HCBP), 2-hydroxy-4- glycidyl ether benzophenone (HEPBP), 2-chloroacetate-4-methoxybenzophen- one(CMBP), and one intrmediates containing benztriazole: 2-(2′-hydroxy-3′-chloroethen- eacyl-5′-methphenyl) benztriazole(HCEPBZ). The chemical structures of the intermediates are confirmed by FT-IR, 1H-NMR and UV.A series of novel water-soluble ultraviolet absorbers based on polyethleneglycol were synthesized of HCBP with polyethleneglycol sodium. The products were characterized by FT-IR, UV and 1H-NMR. The effects of polyethleneglycol with different molecular weights on the water-solubility of the products were also studied. The photostability was estimated by percentage of remanet, which was computed by UV absorbance. It is concluded that the optimal water-soluble product was obtained when the Mw of polyethleneglycol is 1540, and the solubility is 6.87. The products had broad ultraviolet absorption at about 243, 290 and 322nm, and excellent phototability. The molar absorptivity of PEG2000-g-(UV-0)2 and PEG1540-g-(UV-0)2 at 290nm is 17899.7L·mo1-1·cm-1 and 17073.6 L·mol-1·cm-1 respectively, which were calculated from the data of UV absorbance. A series of novel water-soluble ultraviolet absorbers based on polyethleneglycol were synthesized of HCBP,HEPBP, CMBP, HCEPBZ and 3,4,5-trmethoxy benzoyl chloride with polymethylene glycol methyl ether sodium. The products were characterized by FT-IR, UV and 1H-NMR. The photostability was estimated by percentage of remanet, which was gained by UV absorbance. Investigated the stability of pH and the compound stability of grafting products with surfactant, were investigated, It is concluded that the grafting products have good photostability, pH stability and good compound stability with surfactant.A series of carboxymethyl chitosan (CMC) with 2,4-dihydoxybenzophenone (UV-0) substituent were synthesized by the Mannich reaction of carboxymethyl chitosan hydrochloride and UV-0 in the mixturing solvent of methanol and water. The different molar degree of substitution (MS) was achieved by changing the UV-0 content. The effects of MS on ultraviolet absorbability, crystallinity, moisture-absorption and -retention property, pH stability , surface tension and photostability were investigated respectively. The obtained products were characterized by means of FT-IR, 1H- NMR, X-ray diffraction (WXRD), and UV. It was found the products had broad ultraviolet absorption at about 243, 290 and 322nm which take on some red shift in comparison with those of the UV-0, and the ultrabiolet absorption peaks became stronger with the increased degree of substitution of the grafted products. The measure of moisture-retention property showed that the moisture-retention property enhanced and moisture-absorption decreased, the surfactant became enhanced with the increased degree of substitution of the grafted products, the procducts had excellent phototability and good pH stability in pH5.5, 7, 8.
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