Preparation method of novel cardanol modified epoxy resin
A technology of epoxy resin and cardanol, which is applied in the direction of organic chemistry, can solve the problems of insufficient heat resistance and poor weather resistance, and achieve the effects of improved solvent resistance, strong reactivity, and improved stability
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[0027]Example 1
[0028]1) Add 70g of refined cardanol and 0.5g of azobisisobutyronitrile to the reactor, stir and mix uniformly, and pass N in advance2Protect the entire reaction system, increase the temperature to 110°C, keep the temperature for 2 hours;
[0029]2) Add diethyl sulfate-phosphoric acid system (DES-H3PO4) 4g, continuous N2Protect, heat up to 170℃, keep the temperature for 4h, remove N after the reaction is over2After cooling down to room temperature, the cardanol oligomer is obtained;
[0030]3) Add 40g of epichlorohydrin and 0.8g of tetraethylammonium bromide to the cardanol oligomer prepared in step 2), raise the temperature to 65°C, stir for 60min, slowly add 48% NaOH solution dropwise 32g, controlled to drip in 1.5 hours, after dripping, the temperature is raised to 70℃, and the temperature is kept for 1h;
[0031]4) Control the temperature at 70°C and the pressure at 5Kpa, and distill the product prepared in step 3) under reduced pressure, and remove the distillation device...
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[0033]Example 2
[0034]1) Add 150g of refined cardanol and 3.0g of azobisisoheptanonitrile into the reactor, stir and mix evenly, and pass N in advance2Protect the entire reaction system, heat up to 115°C, keep the temperature for 1.5h;
[0035]2) Add diethyl sulfate-sulfuric acid system (DES-H2SO4) 10g, continuous N2Protect and heat up to 190℃, keep the temperature for 2h, remove N after the reaction is over2After cooling down to room temperature, the cardanol oligomer is obtained;
[0036]3) Add 100g of epichlorohydrin and 2g of tetraethylammonium bromide to the cardanol oligomer prepared in step 2), raise the temperature to 75℃, stir for 60min, and slowly add 80g of 48% NaOH solution dropwise , Control the dripping in 3 hours, after dripping, the temperature is raised to 70℃, and the temperature is kept for 2h;
[0037]4) Control the temperature at 75°C and the pressure at 8Kpa, and distill the product prepared in step 3) under reduced pressure. After no liquid is distilled out, remove the ...
Example Embodiment
[0039]Example 3
[0040]1) Add 100g of refined cardanol and 1.0g of azobisisobutyronitrile to the reactor, stir and mix uniformly, and pass N in advance2Protect the entire reaction system, increase the temperature to 120°C, keep the temperature for 1 hour;
[0041]2) Add diethyl sulfate-phosphoric acid system (DES-H3PO4) 6g, continuous N2Protect and heat up to 200℃, keep for 3h, then remove N after the reaction is over2After cooling down to room temperature, the cardanol oligomer is obtained;
[0042]3) Add 60g of epichlorohydrin and 1.2g of tetraethylammonium bromide to the cardanol oligomer prepared in step 2), raise the temperature to 75°C, stir for 60min, and slowly add 48% NaOH solution dropwise 48g, controlled to drip in 2 hours, after dripping, the temperature is raised to 75℃, and the temperature is kept for 1.5h;
[0043]4) Control the temperature at 75°C and the pressure at 8Kpa, and distill the product prepared in step 3) under reduced pressure. After no liquid is distilled out, remo...
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