The preparation and their application in papermaking of aluminium modified silica sol （AMS） and boron modified silica sol （BMS） were first investigated in China.At the same time the structures and configurations o...The preparation and their application in papermaking of aluminium modified silica sol （AMS） and boron modified silica sol （BMS） were first investigated in China.At the same time the structures and configurations of AMS and BMS were first time authenticated.The modified silica sol microparticle system was detailedly and systemically studied with colloid charge titration.On the research of flocculation mechanism the laser sizer was also first time used to determine the floc size.Results showed that sodium silicate was treated and acidification was carried out by means of strongly acid cation exchange resins and obtained almost sodium free acid sols.The acid sol obtained after acidification was then made alkaline.The alkalization was carried out with sodium silicate so that concentration at the preparation could be enhanced and mitigate later condense.Low temperature was in favor of the rate control of particle aggrandizement and smaller and more uniform particles were achieved.The optimal conditions before modification were 8% alkali dosage,heat temperature T12 and heat time 90 minutes.Aluminium and boron modification of the surface were carried out by means of aluminate and borate in order to give particles better charge stability.The retention and drainage efficiency of AMS and BMS were superior to that of imported silica sol NP882 and the retention and drainage efficiency of BMS was superior to that of AMS.And the optimal conditions of aluminium modification were modification degree A3,temperature T24 and reaction time about an hour.Or that of B/Si was 0.08～0.1.Aluminium and boron modification project were feasible and reliable.Ultrafiltration instrument was selected to condense BMS and its optimal conditions were 3.5 kPa pressure with 10 million molecular weight membrane at room temperature.In order to improve the stability of high concentration silica sol,anion or no ion surface actives could be useful.0.01% DBS was found to be the best dispersant and had almost no effect on silica sol which was in f展开更多
文摘The preparation and their application in papermaking of aluminium modified silica sol （AMS） and boron modified silica sol （BMS） were first investigated in China.At the same time the structures and configurations of AMS and BMS were first time authenticated.The modified silica sol microparticle system was detailedly and systemically studied with colloid charge titration.On the research of flocculation mechanism the laser sizer was also first time used to determine the floc size.Results showed that sodium silicate was treated and acidification was carried out by means of strongly acid cation exchange resins and obtained almost sodium free acid sols.The acid sol obtained after acidification was then made alkaline.The alkalization was carried out with sodium silicate so that concentration at the preparation could be enhanced and mitigate later condense.Low temperature was in favor of the rate control of particle aggrandizement and smaller and more uniform particles were achieved.The optimal conditions before modification were 8% alkali dosage,heat temperature T12 and heat time 90 minutes.Aluminium and boron modification of the surface were carried out by means of aluminate and borate in order to give particles better charge stability.The retention and drainage efficiency of AMS and BMS were superior to that of imported silica sol NP882 and the retention and drainage efficiency of BMS was superior to that of AMS.And the optimal conditions of aluminium modification were modification degree A3,temperature T24 and reaction time about an hour.Or that of B/Si was 0.08～0.1.Aluminium and boron modification project were feasible and reliable.Ultrafiltration instrument was selected to condense BMS and its optimal conditions were 3.5 kPa pressure with 10 million molecular weight membrane at room temperature.In order to improve the stability of high concentration silica sol,anion or no ion surface actives could be useful.0.01% DBS was found to be the best dispersant and had almost no effect on silica sol which was in f
