| 配方类型： |
EMULSIONS |
| 配方说明： |
Vinyl Emulsions |
| 配方组成： |
"Tergitol" NPX/0.20
Potassium Persulfate/0.12
Properties of Latex Preparatio
Mechanical Stability/excellent
Average Particle Size Range (Microns)/0.5 (some larger)
2-Ethylhexyl Acrylate/-
Benzoyl Peroxide/0.05
"Natrosol" 250L/125 or 100.00
vinyl Acetate/44.80
"Aerosol OT" (25%)/-
2-Ethylhexyl Acrylate/5.00
Water/46.23
"Tergitol" NPX/1.20
"Aerosol OT" (25%)/0.90
Borax/0.35
Sodium Bicarbonate/-
Potassium Persulfate/0.32
Benzoyl Peroxide/-
"Natrosol" 250L/1.20 or 100.00
Water/43.35
Viscosity, Centipoises/1500-2000
Borax/-
Total Solids/55.09
pH/4.7
Freeze-thaw Stability (5 Cycles)/ok
vinyl Acetate/54.91
Mechanical Stability/excellent
Viscosity, Centipoises/1000-1500
Average Particle Size Range (Microns)/0.5 (some larger)
Total Solids/55.3
Sodium Bicarbonate/0.12
pH/4.5
Freeze-thaw Stability (5 Cycles)/ok |
| 配制方法： |
The protective colloid, surfactant, buffer, and catalyst are blended into the water and charged into a reaction vessel equipped with an agitator, suitable means of heating and colling, 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 percent of the monomer (or comonomer mix) is then added to the reactor with water bath at 68 to 70'C and stirred at 220 rpm. 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, for 2-4 hours at 75-80'C. After the delayed addition is complete the reaction mixture is heated to 90 to 95'C for 30 minutes to complete the reaction and reduce the residual monomer content to less than one percent. At the end of this reaction period, the latex emulsion is cooled to room temperature with contin |
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