Method for preparing light-color pentadiene petroleum resin
A technology of petroleum resin and piperylene, which is applied in the field of synthetic light-colored petroleum resin, which can solve the problems of increased product cost, complex hydrogenation process, and deep color of the product, and achieve stable reaction process, narrow molecular weight distribution, and small color number Effect
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Embodiment 1
[0017] Take 130g of piperylene in a reaction vessel, add 130g of toluene at the same time, after stirring evenly, add 2g of trichlorotriethyldialuminum catalyst and stir evenly. Heat to reflux, maintaining stirring and heating. After the temperature of the reaction system rises to 70°C, keep the temperature for 3-9 hours. Heating was then stopped, and after the reaction system had cooled to room temperature, 45 ml of 8% lye was added to terminate the reaction. The reaction mixture was then transferred to a separatory funnel to separate out alkaline water, and then washed with distilled water until neutral. The resin containing the solvent is transferred to a flask, and the solvent is distilled off under reduced pressure at 180-350° C. to obtain the piperylene petroleum resin with low color number. The resin has the following properties:
[0018] Softening point: 90°C
[0019] Color number: 3
[0020] Yield: 60%
Embodiment 2
[0022] Take 130g of piperylene in a reaction vessel, add 140g of p-xylene at the same time, after stirring evenly, add 2g of trichlorotriethyldialuminum catalyst and stir evenly. Heat to reflux, maintaining stirring and heating. After the temperature of the reaction system rises to 80°C, keep the temperature for 3-9 hours. Afterwards, the heating was stopped, and after the reaction system dropped to room temperature, 45 ml of 8% alkaline water was added to terminate the reaction. The reaction mixture was then transferred to a separatory funnel to separate out alkaline water, and then washed with distilled water until neutral. The resin containing the solvent is transferred to a flask, and the solvent is distilled off under reduced pressure at 180-350° C. to obtain the piperylene petroleum resin with low color number. The resin has the following properties:
[0023] Softening point: 95°C
[0024] Color number: 2
[0025] Yield: 83%
Embodiment 3
[0027] Take 130g of piperylene in a reaction vessel, add 140g of o-xylene at the same time, after stirring evenly, add 2g of trichlorotriethyldialuminum catalyst and stir evenly. Heat to reflux, maintaining stirring and heating. After the temperature of the reaction system rises to 80°C, keep the temperature for 3-9 hours. Afterwards, the heating was stopped, and after the reaction system dropped to room temperature, 45 ml of 8% alkaline water was added to terminate the reaction. The reaction mixture was then transferred to a separatory funnel to separate out alkaline water, and then washed with distilled water until neutral. The resin containing the solvent is transferred to a flask, and the solvent is distilled off under reduced pressure at 180-350° C. to obtain the piperylene petroleum resin with low color number. The resin has the following properties:
[0028] Softening point: 92°C
[0029] Color number: 3
[0030] Yield: 93%
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