A kind of method for preparing eva elastomer
An elastomer and temperature control technology, applied in the field of preparing polymer materials, can solve the problems of high cost and energy consumption of raw materials, high polymerization control difficulty, complicated process operation, etc. The effect of reducing the chance of agglomeration
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Embodiment 1
[0028] A single-pot batch process is adopted; tert-butanol is used as a solvent; the volume ratio of solvent to vinyl acetate is 2:1; the initiator is azobisisobutyronitrile, and the total consumption is 0.5wt% of vinyl acetate; ethylene reaction pressure The total reaction time is 4 hours; the control temperature in the pre-polymerization stage is 45°C, the control temperature in the chain growth stage is 60°C, and the control temperature in the chain termination stage is 55°C; under these conditions, the VAc content in the polymerization product is 59.6wt %.
Embodiment 2
[0030] A single-pot batch process is adopted; tert-butanol is used as a solvent; the volume ratio of solvent to vinyl acetate is 2:1; the initiator is azobisisobutyronitrile, and the total consumption is 0.5wt% of vinyl acetate; ethylene reaction pressure The total reaction time is 4 hours; the control temperature in the pre-polymerization stage is 47°C, the control temperature in the chain growth stage is 62°C, and the control temperature in the chain termination stage is 57°C; under these conditions, the VAc content in the polymerization product is 62.2wt %.
Embodiment 3
[0032] A single-pot batch process is adopted; tert-butanol is used as a solvent; the volume ratio of solvent to vinyl acetate is 2:1; the initiator is azobisisobutyronitrile, and the total consumption is 0.5wt% of vinyl acetate; ethylene reaction pressure 8.0MPa; the total reaction time is 4 hours; the control temperature of the reaction pre-polymerization stage is 49°C, the control temperature of the chain growth stage is 64°C, and the control temperature of the chain termination stage is 59°C; under these conditions, the VAc content in the polymerization product is 65.7wt %.
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