Solvent-free Esterification Of Styrene And Maleic Anhydride Copolymers And The Application Of Its Derivatives

In leather industry,styrene and maleic anhydride copolymers was a common retanning and filling agent.The leather after using it becomes smooth and fine grain,has a feeling of fullness.but in these studies,it needs organic solvents,such as acetone,toluene,DMF and so on,pollutes the environment,does not meet the requirements of green leather chemicals.In this paper,the esterification of styrene and maleic anhydride copolymers(SMAH)was prepared by reacting N,N-Dimethylethanolamine and Primary Alcobol Ethoxylate with styrene and maleic anhydride copolymers(SMA)without solvent.The effect of the types and amount of catalyst,reaction time,reaction temperature and other modification conditions on the esterification rate were further researched,the change of the system viscosity during the reaction was also researched.The structure of SMAH was characterized by means ofFIIR and~1HNMR.The results show that the esterification rate was72.9%,the molar ratio of SMA,N,N-Dimethylethanolamine and Primary Alcobol Ethoxylate was 1:0.5:0.5,respectively,when the mass faction of Propionic acid was 2%,and when the reaction temperature was kept at90? for 4h.Based on the optimum conditions of solvent-free esterification of styrene and maleic anhydride copolymers,the product of SMA-S was prepared by reacting 1,4-butanediol,N,N-Dimethylethanolamine and Primary Alcobol with SMA.The structure of SMA-S was characterized by means of FITR and~1HNMR.SMA-S prepared as retanning agent was applied in leather.The application result show that the series products have good retanning filling effect,not only can give the leather plump,soft feeling,also can enhance the physical properties of leather.Based on the optimum conditions of solvent-free esterification of styrene and maleic anhydride copolymers,the product of SMA-A was prepared by reacting octadecyl alcohol and AEO-9 with SMA.The structure of SMA-A was characterized by means of FITR and~1HNMR.SMA-A was used as multifunctional fatliquor in leather.The application result show that the product has significant retanning and filling properties and a good emulsion ability and stability,the leather after processed has plump,soft and elasticity feeling,the anti-tensile and tear strength of it were improved.