Preparation And Properties Of Water-Soluble Ultraviolet Absorbents With Macromolecule

2,4-Dihydroxybenzophenone(UV-0) and 3,4,5-trimethoxy benzoic acid(TMBA) have good ultraviolet absorption, but their disadvantages are apparent, that is bad water-solubility, easily being absorbed by human bodies through skin because of low molecule, bad compatibility with other cosmetics. To overcome these weaknesses of UV-0 and TMBA, UV-0 introduced into double bond have been successfully copolymerized with acrylamide(AM) or N,N-dimethylaminopropyl acrylamide(DMAPAA) and 3,4,5-trimethoxy benzoyl chloride(TMBC) have also been successfully grafted with Hydroxyethyl cellulose(HEC) or Polyvinyl alcohol(PVA) to improve the water-solubility of the ultraviolet absorbents and to further expand their application fields.Firstly, the preparation of reactive intermediate containing benzophenone UV-0 reacted with Acryloyl chloride by esterification to yield 2-hydroxy-4-acryloyzophenone(HAB) was studied in this paper. It is characterized by Ultraviolet absorption spectroscopy (UV), Fourier transform infrared spectroscopy (FTIR) and Nuclear magnetic resonance spectroscopy (1H-NMR).The novel copolymer(PolyAM or Poly(DMAPAA-co-HAB) ) were synthesized of HAB with AM or DMAPAA and tested by UV and FTIR. The effects of reaction condition on the yield were also studied. The photostability was estimated by percentage of remnant , which was calculated by UV absorbance. The stability of pH and water-solubility were investigated. It is concluded that copolymers have good photostability, pH stability and good compability with surfactants and solubility in water.A series of novel UV absorbers containing the structure of benzoyl were prepared by reaction of HEC or PVA with TMBC. The obtained products were characterized by means of UV and FTIR. The effects of reaction condition on UV absorbance at max absorption wave length were achieved. The degree of substitution(MS) was estimated. The pH stability, photostability, water-solubility and compatibility with surfactants were investigated respectively. It was found the products had stronger absorption at about 256nm for HEC, mildly absorption at about 259nm for PVA due to low MS. It is concluded that copolymers have good photostability, pH stability and good compatibility with surfactant and solubility in water.