配方类型:

ELASTOMERS, POLYMERS, AND RESINS

配方说明:

Model Emulsion Systems (Vinyl/Acrylic System (Tg-30 C))

配方组成:

These model systems were used for the evaluation of various
Surfactants by semicontinuous emulsion polymerization to demonstrate the
effect of a surfactant on various latex properties. Formulation: 50%
solids, 500 g latex batch
Na2S2O8/1.0
Witconate AOS (40%)/31.3
n-Butyl Acrylate/163.0
Deionized Water/217.7
Vinyl Acetate/87.0

配制方法:

Place 50.0 g of the deionized water in an enclosed reactor with attached condenser, stirrer, thermometer, and heating mantle. Flush water and reactor headspace with nitrogen for 15 min and heat to 75 C.
Dissolve Na2S2O8 in 50.0 g of the deionized water, place in a burette and attach to the reactor. Mix the remaining water with surfactant in a beaker and stir for 15 min. Add the monomer to the surfactant solution and stir rapidly for another 15 min to form a monomer preemulsion.
Adjust the preemulsion pH to 5.0 (or as required). Place the preemulsion in a calibrated dropping funnel with stirrer and attach to the reactor.
When the reactor has stabilized at 75 C, add 3 ml of the initiator solution. After 5 min, begin the simultaneous addition of initiator and preemulsion and hold the temperature at 75 C (initiator 4.0 ml per 15 min, preemulsion 50 ml per 15 min). After addition of the preemulsion is completed, add initiator solution for 30 min, then cool and evaluate.