Research On Synthesis And Performance Of Biodegradable Copolymers P(MA-co-taurine) As Non-phosphorous Detergent Builders

For a long term,phosphate detergent builder represented by sodium tripolyphosphate (STPP) had been widely used as detergent builders in synthetic detergent industry because of its good detergent properties.However,its widespread application has caused eutrophication and the destruction of the ecologic environment,many countries have issued the laws and regulations to ban using STPP. PESA as a non-nitrogen and non-phosphors biodegradable polymer exhibits good calcium and magnesium ion sequestration capacity and good buffer capacity, which can be used in detergent industry. Research has shown that the introduction of sulfonic group with a strong electrolytic capacity into PESA molecule simultaneously enhance the dispersing power. In the hope of improving the detergent properties especially the dispersing power of the PESA, in the study, sulfonic group was incorporated into the PESA. This study designed to maleic anhydride and taurine as raw materials, after three-step reaction, the target copolymer of sodium salt of PolyepoxyN-maleoyl-2-aminoethanesulfonic acid was obtained, and the introduction of-SO3Na group with a strong electrolytic capacity into PESP molecule simultaneously enhanced the dispersive power. The specific work as follows:With maleic anhydride and taurine, N-maleoyl-2-aminoethanesulfonic acid was synthesized. At low temperature, this study designed to synthesize the intermediate product, N-maleoyl-2-aminoethanesulfonic acid. During the test, respectively, the conditions on the synthesis, reaction mechanism and influencing factors were analyzed, and eventually arrived at the optimum synthesis conditions of the target product:the reaction time was5h, the reaction temperature was5℃, sodium hydroxide/MA molar ratio of2:1, MA/taurine molar ratio of1.05:1.The yield of the target product generated was97.4%. The product was characterized with primarily elemental analysis, Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance (1H-NMR) and mass spectroscopy.Maked use of hydrogen peroxide oxide, sodium tungstate as catalyst, catalytic oxidation sodium salt of epoxyN-maleoyl-2-aminoethanesulfonic acid.The product was characterized with primarily elemental analysis, Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance (1H-NMR) and mass spectroscopy.During the test, respectively, the conditions on the synthesis, reaction mechanism and influencing factors were analyzed, and eventually arrived at the optimum synthesis conditions of the target product:the reaction temperature was65℃, sodium tungstate/N-maleoyl-2-aminoethanesulfonic acid molar ratio of0.012:1, the pH was controlled at4-5. The yield of the target product generated was96.9%.Then calcium hydroxide as initiator was applied in the synthesis of sodium salt of epoxyN-maleoyl-2-aminoethanesulfonic acid through solution polymerizing.The copolymer was characterized with Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance (1H-NMR) The influence of different technics on detergent properties had been discussed in the paper. The optimized technological conditions were the reaction temperature95℃, the reaction time6h, the mass content of Ca(OH)24%. The calcium binding capacity and dispersing power were respectively326.8mg CaCO3/g and124.9mg CaCO3/g.The crystallization of the copolymers was tested by X-ray diffraction (XRD) and results showed that the copolymers were amorphous and these copolymers may have good biodegradable performance.The biodegradability of the copolymers was judged by shaking table test method. The results showed that the copolymer was biodegradable, and possessed a high calcium sequestration capacity and a good dispersancy which made the copolymer an environment-friendly detergent builder.