Method of preparing rosin modified phenolic resins with high viscosity and high dissolvability
A high-solubility, rosin-modified technology, which is used in the preparation of high-viscosity, high-solubility rosin-modified phenolic resins, can solve the problems of ink drying, fixation performance not fully adaptable, difficult determination of polycondensation end point, phenolic pulp easy to swell, etc. Problems, achieve significant environmental protection, reduce material consumption and energy consumption, and achieve the effect of uniform resin molecular weight
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Embodiment 1
[0021] Put 408g of rosin into a 1000ml four-necked flask with a stirrer and a straight condenser, feed N 2 , heat up and make it melt, and turn on the stirrer. When the temperature rises to 185° C., 24 g of fumaric acid is added, the temperature is continued to rise, and the reaction is carried out under reflux at 200-210° C. for 1 hour. After the heat preservation is completed, lower the temperature. When the temperature drops to 178°C, add 67g of pentaerythritol and 0.8g of magnesium oxide. When the temperature is lowered to 160°C, add 125g of dodecylphenol and 110g of p-tert-octylphenol. After the addition, the temperature drops to At 135°C, 88g of polyoxymethylene was added, and the temperature was controlled at 130°C-140°C for reflux reaction for 3 hours. After the heat preservation is completed, change the straight condenser to a horizontal condenser, continue to heat up to 260°C, keep warm at 260°C-270°C for esterification reaction until the acid value of the reactant i...
Embodiment 2
[0023] 1224g rosin is dropped into the 3000ml stainless steel reactor that has agitator and straight shape condenser, feeds N , heat up and make it melt, open agitator. When the temperature rises to 185° C., 72 g of fumaric acid is added, and the temperature is continued to rise, and the temperature is kept at 200-210° C. for reflux reaction for 1 hour. After the heat preservation is completed, lower the temperature. When the temperature drops to 180°C, add 202g of pentaerythritol and 2.4g of magnesium oxide. When the temperature is lowered to 160°C, add 387g of dodecylphenol and 327g of p-tetraoctylphenol. After the addition, the temperature drops to 137°C, add 260g of polyoxymethylene, control the temperature at 130°C-140°C and keep it under reflux for 3 hours. After the heat preservation is completed, change the straight condenser to a horizontal condenser, continue to heat up to 260°C, and keep warm at 260°C-270°C for esterification reaction until the acid value of the rea...
Embodiment 3
[0025] 36.9Kg rosin is put into a 100l stainless steel reactor with a stirrer and a straight condenser, feed N 2 , heat up and make it melt, and turn on the stirrer. When the temperature rises to 185°C, add 0.4Kg of fumaric acid, continue to heat up, and keep warm at 200-210°C for reflux reaction for 1 hour. After the heat preservation is completed, the temperature is lowered. When the temperature drops to 178°C, add 6.5Kg of pentaerythritol and 0.1Kg of magnesium oxide. When the temperature is lowered to 160°C, add 10.0Kg of dodecylphenol and 8.8Kg of p-tetraoctylphenol. , the temperature was lowered to 137°C, 6.5Kg of polyoxymethylene was added, and the temperature was controlled at 130°C-140°C for reflux reaction for 3 hours. After the heat preservation is completed, change the straight condenser to a horizontal condenser, continue to heat up to 260°C, keep warm at 260°C-270°C for esterification reaction until the acid value of the reactant is less than 25mg KOH / g, and depr...
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