配方类型:

ELASTOMERS, PLASTICS AND RESINS

配方说明:

Copolymer Latex

配方组成:

2-Ethylhexyl Acrylate/45
NaHCO3/0.3
K2S2O8 (fresh 1.5% sol'n.)/60
"Aerosol" A-102 Surfactant (35% sol'n.)/25.7
Vinyl Acetate (H grade)/255
Boiled Deionized Water/58
NaHSO3 (fresh 1% sol'n.)/30

配制方法:

Equipment: 1 liter, 3-necked, round bottom flask, mantle, stirrer, condenser, thermometer, adapters, addition funnels and tank of prepurified nitrogen.
Prepare fresh solutions of K2S2O8 (1.5%) and NaHSO3 (1%) using boiled, deionized water and purge for ca. 10 min with a stream of prepurified nitrogen. Charge to the reaction vessel all of the required amount of surfactant solution, all of the bicarbonate and the boiled deionized water. Purge under the surface of the liquid with a stream of prepurified nitrogen for ca. 15 min. Add 3 ml of the bisulfite solution, 15 ml of the persulfate solution, and 30 g (33 ml) of the monomer mixture. Adjust the gas inlet tube to purge the air space above the liquid. Set the stirrer speed at = 250 rpm and begin to heat to reflux temperature. After the polymerization exotherm subsides (initial monomer charge polymerized), begin the continuous addition of the remaining monomer mixture, persulfate solution and bisulfite solution. Adjust addition rates so after 3 h all of the