Preparation method of pale rosin ester
A rosin ester, light-colored technology is applied in the field of preparation of light-colored rosin esters, and can solve the problems such as the inability to meet market demands and the dark color of rosin esters.
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Embodiment 1
[0013] The preparation method of this light-colored rosin ester comprises the following steps:
[0014] A. Put 50kg of rosin into the reaction kettle, under the condition of nitrogen as a protective agent, adjust the intake of nitrogen to 5ml / min, heat it to completely melt, then raise the temperature to 200°C, and keep it warm for 4 hours;
[0015] B. After step A, add 5kg of polyol, 0.8kg of zinc oxide, 0.8kg of sodium thiosulfate and 0.6kg of calcium hypophosphite into the reaction kettle, stir evenly, and continue to keep warm at 200°C for 1 hour; then raise the temperature To 270°C, heat preservation reaction for 4h;
[0016] C. After step B, vacuumize to remove low boilers, then lower the temperature to 200°C, and discharge to obtain the light-colored rosin ester.
[0017] The Garner color number of the light-colored rosin ester prepared in this example is 3, and the softening point is 105°C.
Embodiment 2
[0019] The preparation method of this light-colored rosin ester comprises the following steps:
[0020] A. Put 60kg of rosin into the reaction kettle, under the condition of nitrogen as a protective agent, adjust the intake of nitrogen to 8ml / min, heat it to completely melt, then raise the temperature to 220°C, and keep it warm for 1h;
[0021] B. After step A, add 8kg of polyol, 0.8kg of zinc oxide, 0.8kg of sodium thiosulfate and 0.6kg of calcium hypophosphite into the reaction kettle, stir evenly, and continue to keep warm for 0.5h at 220°C; then heat up To 280°C, heat preservation reaction for 2h;
[0022] C. After step B, vacuumize to remove low boilers, then lower the temperature to 200°C, and discharge to obtain the light-colored rosin ester.
[0023] The Garner color number of the light-colored rosin ester prepared in this example is 3, and the softening point is 106°C.
Embodiment 3
[0025] The preparation method of this light-colored rosin ester comprises the following steps:
[0026] A. Put 55kg of rosin into the reaction kettle, under the condition of nitrogen as a protective agent, adjust the intake of nitrogen to 7ml / min, heat it to completely melt, then raise the temperature to 210°C, and keep it warm for 3 hours;
[0027] B. After step A, add 5kg of polyol, 0.6kg of zinc oxide, 0.6kg of sodium thiosulfate and 0.5kg of calcium hypophosphite into the reaction kettle, stir evenly, continue to keep warm at 210°C for 0.5h; then raise the temperature To 275°C, heat preservation reaction for 3h;
[0028] C. After step B, vacuumize to remove low boilers, then lower the temperature to 205°C, and discharge to obtain the light-colored rosin ester.
[0029] The Garner color number of the light-colored rosin ester prepared in this example is 3, and the softening point is 104°C.
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