Study On Performance And Strength Of Amphoteric Polyacrylamide

Preparation of stable Pickering emulsion by using fine solid particles as the emulsifier is the the future direction.Pickering emulsion has the advantages such aseconomic cost,environment protecting,low amount of emulsifier.So,Pickering emulsion can be widely used in the textile,chemical industry,paper making,fine chemical industry and so on.In this paper calcium carbonate and titanium dioxide were used as solid particles to prepare AKD Pickering emulsion.The stability and the sizing properties of the emulsion were studied.In this chapter,dopamine amino acids used to modify titanium dioxide which was the substitute of AKD emulsifier.Ultimately,the AKD Pickering emulsion were prepared successfully.The results showed that the optimum modified conditions are asfollows:Reaction temperature is around 25?.Reaction time is 12 h.The ratio of dopamine to titanium dioxide is 1.5:1.The pH value of reaction system is 8.5.Under this condition,the modified products have good emulsifying effect.The Cobb value of Pickering emulsion could reach 23.4 g/m~2.The particle size of Pickering emulsion is about 700 nm.The emulsion can improve the sizing performance of recycled paper which could also reduce the dosage of emulsifier,enhance sizing effect and so on.Secondly,coupling agent was used as modifying agent to prepare calcium carbonate with amphiphilic structure.When the dosage of silane coupling agent modification agent was 1.5%,the modification time is 8 h,modification temperature is100?,and the stirring speed was 1000 r/min,the dosage of titanate coupling agent was 3%,the modification time of 1 h,modification temperature was 85?,the stirring speed of 1000 r/min.Under this condition,AKD Pickering emulsion has good sizability.But the emulsion particle size is around 2000 nm.