Fluorine-containing epoxy resin and composite material and preparation method thereof
A technology of epoxy resin and composite materials, applied in the direction of organic chemistry, etc., can solve the problems of expensive fluorine-containing epoxy resin, limited application, difficult molecular design of fluorine-containing epoxy resin, etc., and achieve low heat resistance, High hydrophobicity, solve the effect of limited application
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[0038] The present invention also provides a preparation method of the above-mentioned fluorine-containing epoxy resin, the steps are as follows:
[0039] Step 1. Add 3,5-bistrifluoromethylaniline and deionized water into the reaction device. Under the condition of maintaining the temperature at 0-5°C and continuous stirring, first add aqueous hydrochloric acid solution to the reaction device dropwise, and then Add an aqueous solution of sodium nitrite dropwise to the reaction device, after the dropwise addition is completed, stir and react for 1-1.5 hours, and filter under reduced pressure to obtain an aqueous diazonium salt solution;
[0040] Add p-benzoquinone, sodium bicarbonate and deionized water to the reaction device, and add the obtained diazonium salt solution dropwise under the condition of keeping the temperature at 5-8°C and continuous stirring. After the dropwise addition is completed, stir the reaction 3 -5h, suction filtration to obtain 3,5-ditrifluoromethylphe...
Embodiment 1
[0060] 3,5-bistrifluoromethylaniline (114.56g, 0.5mol) and 200mL deionized water were added to a 1000mL beaker equipped with a mechanical stirring device under an ice bath environment, and a dropping funnel and a thermometer were installed simultaneously; then keep The temperature of the reaction system is 0-5°C. Under continuous stirring, first add 168mL of 37% hydrochloric acid solution dropwise to the reaction system, and then add 124.5g of 27.7% sodium nitrite solution dropwise. After the addition is completed, stir Reaction for 1 h; after vacuum filtration, a light yellow diazonium salt solution was obtained.
[0061] In a large beaker filled with p-benzoquinone (54g, 0.5mol), sodium bicarbonate (126g, 1.5mol) and 200mL of deionized water, keep the temperature of the reaction system at 5-8°C, and add dropwise to prepare diazonium salt solution, after the dropwise addition was completed, the reaction was continued to stir for 3 hours, and a brown-yellow solid was obtained ...
Embodiment 2
[0065] Weigh 55 parts by weight of fluorine-containing epoxy resin (Example 1), 44 parts by weight of methylhexahydrophthalic anhydride and 1 part by weight of benzimidazole. Mix the fluorine-containing epoxy resin and methyl hexahydrophthalic anhydride evenly, heat in an oven at 100°C for 1 hour, cool to room temperature, add benzimidazole, mix evenly (30min), put in a vacuum oven, and depressurize at room temperature to - 0.1MPa, remove the air mixed in the glue. Pour the degassed glue solution into a metal mold wiped with release agent, put it in an oven to heat and cure; the curing conditions are: 120°C / 2h+160°C / 2h+200°C / 2h.
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