Synthesis, Characterization And Application Of Terminal Sulfonic Acid Hyperbranched Polymers

Graft modification was an important mean of modified hyperbranched polymer. In this study, the multiterminal alkenyl polymer(HPAE-UA) was synthesised by using the sulfonation reaction. Then, a new type of polymer with the terminal of sulfonic acid(SAHHP) by sulfonated modifying HPAE-UA was prepared through the sulfonation reaction of the alkenyl. Next, HPAE-UA and SAHHP applied in the leather-making. We investigated the effect of them on the performance of the leather.In this study, a generation of N, N-dihydroxy methyl ethyl-3-amino propionic acid(HPAE) was prepared using methyl acrylate, ethylenediamine and methanol as the raw materials. Next, multiterminal alkenyl hyperbranched polymer(HPAE-UA) by graft modifying HPAE was synthesized using p-toluene sulfonic acid(p-TSA) as the catalyst. During which the reaction time, reaction temperature and the dosage of the catalyst were optimized. The structure of HPAE-UA were studied by means of fourier infrared spectrum(FT-IR) and nuclear magnetic resonance hydrogen spectrum(1H-NMR). The emulsion performance of the modified products was characterized. The results showed that it was good. HPAE-UA could be used as the fatliquor applied in the leather.HPAE-UA was then applied in the leather fatliquoring and retanning process using the sheep garment leather of blue-wet as the raw material. The physical and mechanical properties, softness, structure and thermal stability performance of the leather were characterized by tensile machine, softness measurement instrument, scanning electron microscopy(SEM), and the shrinkage temperature instrument(Ts).(1) When HPAE-UA were used as the fatliquor, by optimizing the grafted rate and dosage of HPAE-UA, we can concluded that when the grafting rate of HPAE-UA was 35.2%, the dosage was 8%, the leather was softest and the collagen fibers were largely loosened with the help of HPAE-UA.(2) Compared with the application of TJ-F606, The physical and mechanical properties, softness and static water absorption of the leather by HPAE-UA obvious enhancemented. The results show that HPAE-UA had obvious fatliquoring effect.(3) When HPAE-UA were used as the retanning agent, by optimizing the grafted rate and dosage of HPAE-UA, we can concluded that when the grafting rate of HPAE-UA was 35.2%, the dosage was 5%, the shrinkage temperature and thickening of leather by it increased most obviously.(4) The results of shrinkage temperature of the retanned leather showed that when HPAE-UA was used as retanning agent, Ts of the leather enhancemented significantly. And it was 8.2 oC higher than that of the wet-blue. Drawn from the results described above, we could draw a conclusion that HPAE-UA had the function of fatliquoring and retanning in leather-making.The fatliquoring effects of leather increased obviously by HPAE-UA. However, compared with the wet-blue, the retanning effects of leather by HPAE-UA improved slightly. So, a new type of polymer with the terminal of sulfonic acid(SAHHP) by sulfonated modifying HPAE-UA(J=45.4%) was prepared through the sulfonation reaction of the alkenyl, during which the reaction time, reaction temperature and the dosage of the catalyst were optimized. The structure and properties of SAHHP were studied by means of fourier infrared spectrum(FT-IR) and nuclear magnetic resonance hydrogen spectrum(1H-NMR). The emulsion particle size of the modified products at different p H(2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5) was characterized using the laser particle size analyzer and transmission electron. The results showed that when the p H was 4.0, SAHHP had the trend of agglomeration.SAHHP was also applied in the leather tanning and retanning process using the sheep garment leather of blue-wet as the raw material. The physical and mechanical properties, softness and the thermal performance of the leather were characterized through the method instruments of tensile machine, softness measurement instrument and the shrinkage temperature instrument(Ts).(1) When SAHHP(four kinds of products) were used as the fatliquor, by optimizing the dosage of SAHHP(four kinds of products), we can concluded that when the dosage of SAHHP(four kinds of products) was 8%, the leather was softest.(2) Compared with the application of HPAE-UA, with the increased of sulfonation degree of SAHHP, the softness and static water absorption of leather decreased gradually. But the physical and mechanical properties of the leather were gradually enhanced. Compared with the application of SK-70, the Physical and mechanical properties and static water absorption of the leather enhanced under different degree. The results showed that SAHHP had fatliquoring effect on leather.(3) When SAHHP(four kinds of products) were used as the retanning agent, by optimizing the dosage of SAHHP(four kinds of products), we can concluded that when the dosage of SAHHP(four kinds of products) was 5%, the shrinkage temperature and thickening of leather by it increased most obviously.(4) The results of Ts showed that when SAHHP( DS=48.99 mmol/g) was used as retanning agent, the shrinkage temperature of the leather increased to 97 oC. Compared with that of wet-blue, it raised 16 oC. Compared with the application of NF, the thickening of the leather by SAHHP enhanced at different degree. Drawn from the results described above, we could draw a conclusion that SAHHP had the function of retanning and fatliquoring in leather-making. Compared with the leather by HPAE-UA( J=45.4%), the Ts of the leather by SAHHP increased more significantly. So the retanning effects of SAHHP was better than that of HPAE-UA. Compared with the leather by NF, the physical and mechanical properties and the thermodynamic performance of the leather after retanning by SAHHP increased at different degrees.