| 配方类型： |
EMULSIONS & DISPERSIONS |
| 配方说明： |
Vinyl Acetate Emulsions |
| 配方组成： |
Potassium persulfate/0.12
2-Ethylhexyl acrylate/-
Benzoyl peroxide/0.05
"natrosol" 250L/1.25
"Aerosol" OT (25%)/-
Vinyl acetate/44.80
2-Ethylhexyl acrylate/5.00
Water/46.23
"Tergitol" NPX/1.20
"Aerosol" OT (25%)/0.90
Borax/0.35
Water/43.35
Sodium bicarbonate/-
Borax/-
Potassium persulfate/0.32
Benzoyl peroxide/-
"natrosol" 250L/1.20
Vinyl acetate/54.91
Sodium bicarbonate/0.12
"Tergitol" NPX/0.20 |
| 配制方法： |
The protective colloid, surfactant, buffer and catalyst are blended into the water and charged into a reaction vessel that is equipped with an agitator, suitable means of heating and cooling, a condenser, and a reservoir for monomer. The vessel is sealed and a nitrogen purge is used to expel all oxygen from the system. The monomer (or comonomer mix) is placed in the reservoir. Approximately 10% of the monomer (or comonomer mix) is then added to the reactor with water bath at 68-70'C. and stirred at 220 r.p.m. As the polymerization proceeds, the reflux rate will decrease and the temperature will rise to about 75'C. At this time, the remaining monomer (or comonomer mix) is added uniformly, with stirring, over a 2-4-hr period at a temperature of 75-80'C. After the delayed addition is complete the reaction mixture is heated to 90-95'c.
for 30 min to complete the reaction and reduce the residual monomer content to less than 1%. At the end of this reaction period, the latex emulsion is cooled to room temperatu |
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