Abstract: Paraffin wax and polyethylene wax were used as raw materials for the preparation of modified paraffin that was further processed to prepare wax emulsion for paper-making.Effects of emulsifier and process conditions on performance of the wax emulsion were investigated.Results showed that under condition as the HLB of compounded emulsifier consisting of Tween 20+Span 40+Stearic acid is 10;the dosage of compounded emulsifier is 24%;the temperature is 90 ℃;the stirring speed is 900 r·min^-1;the emulsifying time is 40 min;the prepared wax emulsion shows good stability and dispersity.It is suitable for use in paper sizing process.

Key words: emulsifier, wax emulsion, preparation, paper-making