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| Factors | Reaction time/h | Reaction temperature/°C | Ratio of raw materials | Amine value/mg KOH g−1 | Viscosity/Pa s |
|---|---|---|---|---|---|
| Experiment 1 | 1.5 | 160 | 2 | 427 | 62.125 |
| Experiment 2 | 1.5 | 180 | 2.5 | 592 | 6.265 |
| Experiment 3 | 1.5 | 200 | 3 | 680 | 3.428 |
| Experiment 4 | 2 | 160 | 2.5 | 676 | 16.700 |
| Experiment 5 | 2 | 180 | 3 | 740 | 4.178 |
| Experiment 6 | 2 | 200 | 2 | 595 | 50.371 |
| Experiment 7 | 2.5 | 160 | 3 | 744 | 4.670 |
| Experiment 8 | 2.5 | 180 | 2 | 493 | 73.120 |
| Experiment 9 | 2.5 | 200 | 2.5 | 628 | 9.362 |
