Universal pigment preparation
A technology for pigment preparations and pigments, applied in the directions of pigment paste, application, organic dyes, etc., can solve problems such as suboptimal dispersion state and defects in organic coatings
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[0112] 1) Preparation of polyoxyalkylenes containing styrene oxide (component B)i), not according to the invention 336.4 g (2.34 mol) of trimethylcyclohexanol and 16.3 g (0.23 mol) of potassium methoxide were charged to the reactor. After careful flushing with pure nitrogen, the starting material was heated to 110° C. and 308.2 g (2.554 mol) of styrene oxide were added within one hour. After another two hours, the addition reaction of styrene oxide was completed, and according to the gas chromatogram, it was proved that the reaction was completed by the residual styrene oxide content < 0.1% by weight. Then 339.2 g (7.71 mol) of ethylene oxide were fed into the reactor at such a rate that the internal temperature did not exceed 120°C and the pressure did not exceed 6 bar. After complete addition of ethylene oxide, the temperature was controlled at 115° C. until the pressure on the manometer indicating the end of the subsequent reaction was constant. Finally, unreacted residual...
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