反应详情

A 500 ml flask equipped with a stirrer, thermometer, and condenser is charged with 100 ml DMSO, 8.9 grams of 45% aqueous potassium hydroxide, and 9 ml water. 8.5 grams unsubstituted gamma-II-quinacridone and 1.5 grams 3,6-diphenyl-1,4-diketopyrrolo[3,4-c]pyrrole are added at 40°-50° C. The mixture is heated and stirred for 5 minutes at 80°-90° C. The resulting deep blue solution of the pigment salts is drowned into methanol at 20°-40° C., causing the pigment to precipitate. The pigment suspension is stirred at reflux temperature for 1 hour, then filtered. The presscake is washed DMSO-free with methanol, followed by water to a pH 7.0-8.0, and then dried. The pulverized pigment shows the x-ray diffraction pattern of a gamma-1-quinacridone without peaks of the DPP pigment and different from the x-ray diffraction diagram of the gamma-II-quinacridone starting material. Thus, a quinacridone/DPP pigment solid solution with the quinacridone as host is formed. The pigment solid solution shows an opaque highly saturated strong red color when applied in plastics or paints with excellent weatherfastness properties.

1. customA 500 ml flask equipped with a stirrer
2. temperatureThe mixture is heated
3. customto precipitate
4. stirringThe pigment suspension is stirred
5. temperatureat reflux temperature for 1 hour
6. filtrationfiltered
7. washThe presscake is washed DMSO-free with methanol
8. customdried