A kind of aramid-based epoxy resin and preparation method thereof
A technology based on epoxy resin and aramid fiber, which is applied in the field of aramid fiber-based epoxy resin and its preparation, can solve the problems of loss of reinforcing effect, reduced reactivity of amide group H in the molecular chain of aramid fiber, and reduced body strength. Achieve the effects of high epoxy value, high reactivity, and improved bending strength
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Embodiment 1
[0030] Add 300 mL of dimethyl sulfoxide to a 1000 mL four-necked flask equipped with a stirrer, condenser, and thermometer, add 1.4 g of metallic sodium under nitrogen protection, heat up to 80 ° C, stir until Na dissolves, and the solution turns into a dark brown-red metal Metallizing reagent; under nitrogen atmosphere, add metallizing reagent to 1000mL autoclave, add 6g of inferior product aramid fiber powder, nitrogen replaces the air in the kettle, stir and heat up, then feed 15.5g of ethylene oxide, control the reaction temperature 110 ℃, the reaction pressure is less than 0.8MPa, and the grafting reaction time is 2.5h, the crude product of hydroxyalkylated aramid fiber is prepared; the hydroxyalkylated aramid fiber is added to the four-port reflux condenser, thermometer, and constant pressure dropping funnel. In the flask, under the protection of nitrogen, the temperature was raised to 30°C, and 10.5g of epichlorohydrin was slowly added dropwise. After 1h, the temperature...
Embodiment 2
[0032] Add 300 mL of dimethyl sulfoxide to a 1000 mL four-necked flask equipped with a stirrer, condenser, and thermometer, add 1.4 g of metallic sodium under nitrogen protection, heat up to 80 ° C, stir until Na dissolves, and the solution turns into a dark brown-red metal Metallizing reagents; under nitrogen atmosphere, add metallizing reagents to a 1000mL autoclave, add 6g of defective aramid fiber powder, replace the air in the kettle with nitrogen, stir and heat up, then feed 10.3g of ethylene oxide, and control the reaction temperature at 120 ℃, the reaction pressure is less than 0.8MPa, and the grafting reaction time is 2.5h, the crude product of hydroxyalkylated aramid fiber is prepared; the hydroxyalkylated aramid fiber is added to the four-port reflux condenser, thermometer, and constant pressure dropping funnel. In the flask, under the protection of nitrogen, the temperature was raised to 40°C, and 10.5g of epichlorohydrin was slowly added dropwise. After 1h, the tem...
Embodiment 3
[0034] Add 300 mL of dimethyl sulfoxide to a 1000 mL four-necked flask equipped with a stirrer, condenser, and thermometer, add 1.4 g of metallic sodium under nitrogen protection, heat up to 80 ° C, stir until Na dissolves, and the solution turns into a dark brown-red metal Metallizing reagents; under nitrogen atmosphere, add metallizing reagents to a 1000mL autoclave, add 6g of defective aramid fiber powder, replace the air in the kettle with nitrogen, stir and heat up, then feed 20.6g of ethylene oxide, and control the reaction temperature at 130 ℃, the reaction pressure is less than 0.8MPa, and the grafting reaction time is 2.5h, the crude product of hydroxyalkylated aramid fiber is prepared; the hydroxyalkylated aramid fiber is added to the four-port reflux condenser, thermometer, and constant pressure dropping funnel. In the flask, under the protection of nitrogen, the temperature was raised to 50°C, and 10.5g of epichlorohydrin was slowly added dropwise. After 1h, the tem...
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Abstract
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