Application of epoxy cardanol as bio-based hindered phenolic antioxidant
A cardanol and antioxidant technology, which is applied in the field of preparation of bio-based hindered phenol antioxidants, can solve the problems of harsh production conditions, limited promotion and application, expensive catalysts and the like, and achieves easy process control, wide sources and low prices. Effect
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[0034] Example 1
[0035] Weigh 5g cardanol, 0.8g formic acid, 0.1g p-toluenesulfonic acid and 5mL toluene, add them to a three-necked flask equipped with condenser, stir bar and thermometer, stir and heat to 50℃, add 5.5g hydrogen peroxide (50%) dropwise , The dropping rate is 10mL / h. After the addition is completed, the reaction system is heated to 65°C for 3h; after the reaction, the crude product is left to stand for layering to obtain the organic phase, and 50°C with a mass fraction of 2% sodium bicarbonate solution And 50 ℃ deionized water or distilled water to wash to neutral, flash evaporate to remove water, recover the solvent, the bio-based hindered phenol type antioxidant product is obtained. The product is a yellow oily liquid with an epoxy value of 3.78%.
Example Embodiment
[0036] Example 2
[0037] Weigh 5g cardanol, 1.0g acetic acid, 0.3g732 cation exchange resin and 5mL n-hexane, add them to a three-necked flask equipped with condenser, stir bar and thermometer, stir and heat to 55℃, add 5.5g hydrogen peroxide (50%) dropwise , The dropping rate is 10mL / h. After the addition is completed, the reaction system is heated to 65°C for 3.5h; after the reaction, the crude product is left to stand for layering to obtain the organic phase, using 50°C with a mass fraction of 2% sodium bicarbonate The solution and 50℃ deionized water or distilled water are washed to neutrality, the water is removed by flash evaporation, and the solvent is recovered to obtain the finished bio-based hindered phenol antioxidant. The product is a yellow oily liquid with an epoxy value of 3.42%.
Example Embodiment
[0038] Example 3
[0039] Weigh 5g cardanol, 0.9g formic acid, 0.2g p-toluenesulfonic acid and 10mL toluene, add them to a three-necked flask equipped with condenser, stir bar and thermometer, stir and heat to 50℃, add 6.5g hydrogen peroxide (30%) dropwise , The dropping rate is 50mL / h. After the addition is completed, the reaction system is heated to 65°C for 3.5h; after the reaction, the crude product is left to stand for layering to obtain the organic phase, and 30°C with a mass fraction of 2% sodium bicarbonate is used The solution and 70 ℃ deionized water or distilled water are washed to neutrality, the water is removed by flash evaporation, the solvent is recovered, and the finished product of bio-based hindered phenol antioxidant is obtained. The product is a yellow oily liquid with an epoxy value of 3.61%.
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