配方类型:

RUBBER, RESINS, WAXES

配方说明:

Vinyl Acetate Polymerization

配方组成:

PVM/MAe("GANTREZ" AN-119)/3.0
6% aqueous solution of ammonium persulfate/6.0
Dioctyl sodium sulfosuccinate/0.5
Watr/42.0
5% aqueous solution of sodium bisulfite/5.0
Formula No.
Deionized Watr/253 g
"Triton" QS Surfactant (100% Basis)/12 g
Vinyl acetate monomer/54.0
Vinyl Acetate/330 g
Potassium Persulfate, 5% Solution/30 g

配制方法:

Charge the deionized water into a 1 liter 3-neck round bottom flask equipped with a thermometer, reflux condenser, nitrogen inlet tube (extending close to the upper wall), calibrated addition funnel, and a paddle or propeller stirrer. below the flask, set an oil or water bath, equipped with a thermometer, stirrer, and immersion heater, and supported on a laboratory jack for heating and cooling the reaction mixture. Adjust the speed of the stirrer in the flask to 350-400 rpm and add the QS surfactant to the deionized water. With continuous stirring, add sufficient 50% sodium hydroxide solution to the water-surfactant mixture to adjust the pH to about 9. Purge the mixture with nitrogen for 20 minutes, turn off the nitrogen feed, and begin heating the mixture.
When the temperature reaches 70'C add 15 ml of the potassium persulfate solution. When the temperature reaches 78'C start adding the monomer at 100 ml/hour. Maintain the temperature at 80-85'C during the monomer addition by cooling for (or heating) as