| 配方类型： |
RUBBER, PLASTICS, WAXES |
| 配方说明： |
Emulsion Copolymerization |
| 配方组成： |
"Cellosize" Hydroxyethyl Cellulose WP-09/1.85
"Cellosize" Hydroxyethyl Cellulose WP-300/0.69
Water/54.00
In a suitable polymerization kettle fitted with an agitator and
condenser, prepare an aqueous solution of the "Cellosize," "Tergitol"
Nonionic NPX, and potassium persulfate catalyst in the proportions
indicated above.
Blend the two monomers and add 5% of this mixture to the aqueous system
with stirring. Establish and maintain a nitrogen blanket over the system
throughout the polymerization period. Continue agitation and apply
external heat to the kettle till a temperature of 70'C is reached, at
which time polymerization of the initial charge is essentially complete.
Add, with agitation, the remainder of the monomer mixture in small
increments at rate of about 40% per hour so as to maintain a temperature
between 70 to 75'C in the kettle with very slight refluxing. Then keep
temperature between 70-75'C for an additional half hour, an |
| 配制方法： |
Dissolve 2.5 sodium lauryl sulfate, 1 ammonium persulfate, and 5 of 28% sodium acrylate solution in 250 of water. Add 75 vinyl propionate and 25 di(n-butyl) maleate. Adjust the pH to 5.2 and polymerize by heating with agitation to 80 and 90'C for 4 hours. Adjust the pH of the final emulsion to 6.8 by adding required amounts of 10% sodium bicarbonate solution. |
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