| Scale inhibitors are an effective method to inhibit scaling in cooling water systems.The traditional way to use scale inhibitors is to directly add scale inhibitors into circulating cooling water system,which shows the disadvantages of short feed cycle and low utilization rate of scale inhibitors.Slow-release technology can effectively improve the action time and utilization rate of target drugs,and has been widely used in medicine,agriculture and other fields.Among them,polymer porous microspheres are one of the commonly used sustained-release carriers because of their porous structure and large specific surface area.In this paper,a ternary copolymer porous microsphere was prepared by suspension polymerization method,which was used as a slow release carrier for scale inhibitors to solve the problems of short feed time and low utilization rate of scale inhibitors.1-butyl-3-vinylimidazolium bistrifluoromethanesulfonimide salt（BVBS）was prepared by a two-step method,and the product was analyzed by Fourier Transform infrared spectroscopy（FTIR）,hydrogen Nuclear magnetic resonance（1H NMR）and carbon thirteen Nuclear magnetic resonance(13C NMR).BVBS,glycidyl methacrylate（GMA）and divinylbenzene（DVB）are used as the reactants,and BVBS-GMA-DVB copolymer porous microspheres were synthesized by suspension polymerization method.The product was then characterized by FTIR,scanning electron microscopy（SEM）,aperture specific surface area analyzer,and X-ray diffractometry（XRD）.The factors about the monodispersity were studied.The results showed that the monodispersity was gradually improving with the increase of the amount of polyvinyl alcohol.The monodispersity was gradually improving with the increase of volume ratio of aqueous phase to oil phase.The monodispersity was gradually improving with the increase of stirring rate.The factors on the pore size were studied.The results showed that the average pore size was graually increasing as the amount of porogen increased.The average pore size was graually decreasing as the amount of crosslinker increased.Porous microspheres loaded with hydroxyethylidene diphosphonic acid and polyacrylic acid were prepared by static adsorption method.The factors about the adsorption capacity were studied.The results showed that as the pore size increased,the adsorption amount corresponding to the two scale inhibitors gradually increased.As the specific surface area increased,the adsorption amount corresponding to the two scale inhibitors gradually increased.As the initial concentration of scale inhibitor increased,the adsorption amount corresponding to the two scale inhibitors gradually increased.The release process of two scale inhibitors was studied.The results showed that as the temperature increased,the time required for the two scale inhibitors to reach the release equilibrium is shortened.As the pore size increased,the time required for the two scale inhibitors to reach the release equilibrium is shortened.As the particle size decreased,the time required for the two scale inhibitors to reach the release equilibrium is shortened.A comparative experiment between loaded scale inhibitor and unloaded scale inhibitor was completed.The results demonstrated that the scale inhibition efficiency of the loaded scale inhibitor still maintained above 60%after 28 h,and the scale inhibition efficiency of the unloaded scale inhibitor has been reduced to 25%.This proved that the loaded scale inhibitor has a good slow-release effect. |
