Method for preparing EVA emulsion by adding alcohol solvent
A technology of alcohol solvent and emulsion, which is applied in the field of preparing EVA emulsion by adding alcohol solvent, can solve the problems of cumbersome manipulation, high cost and energy consumption, long polymerization reaction time, etc. Effect of polymerization time
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[0028] Such as figure 1 The shown copolymerization reaction device for preparing EVA elastomer emulsion. A single-pot batch operation is adopted, including a copolymerization reactor 1, a feeding mechanism and a product post-treatment part. The top of the copolymerization reactor 1 is provided with a surfactant, an initiator, a pH regulator and a vinyl acetate liquid phase feed inlet, and N 2and ethylene feed port. The emulsifier / colloid protective agent tank 2 is communicated with the copolymerization reactor 1 through the high-pressure metering pump 6-2, the initiator tank 3 is communicated with the copolymerization reactor 1 through the high-pressure metering pump 6-3, and the pH value regulator tank 4-1 is communicated with the copolymerization reactor 1 through the high-pressure metering pump 6-3. The metering pump 6-4 communicates with the copolymerization reactor 1, and the VAc monomer tank 5 communicates with the copolymerization reactor 1 through the high-pressure m...
Embodiment 1
[0033] In the aqueous phase polymerization system, methanol is added as the second solvent, and the volume ratio of methanol to vinyl acetate is 1:2; the initiator is azobisisobutyronitrile, and the dosage is 0.5wt% of vinyl acetate; the surfactant The op-10 consumption is 10.0wt% of the VAc monomer consumption; the pH regulator sodium bicarbonate consumption is 0.5wt% of the VAc monomer consumption; the colloid protective agent PVA consumption is 3.0wt% of the VAc monomer consumption; The temperature is 65°C, and the ethylene reaction pressure is 8.0MPa. Under this condition, the VAc content in the polymerization product was 61.9 wt%, and the polymerization reaction time was 1.8 h.
Embodiment 2
[0035] In the aqueous phase polymerization system, methanol is added as the second solvent, and the volume ratio of methanol to vinyl acetate is 1:2.5; the initiator is azobisisobutyronitrile, and the dosage is 0.5wt% of vinyl acetate; the surfactant The op-10 consumption is 10.0wt% of the VAc monomer consumption; the pH regulator sodium bicarbonate consumption is 0.5wt% of the VAc monomer consumption; the colloid protective agent PVA consumption is 3.0wt% of the VAc monomer consumption; The temperature is 65°C, and the ethylene reaction pressure is 8.0MPa. Under this condition, the VAc content in the polymerization product was 62.3 wt%, and the polymerization reaction time was 2.2 hours.
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