High temperature resistant wire enamelling composition based on fluorine-containing polyaryletherketone copolymerization modified polyimide and preparation method thereof
A technology of polyaryletherketone and copolymerization modification, which is applied in coatings, fireproof coatings, etc., can solve the problems of low heat resistance and limited application, and achieve the effect of high heat resistance
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Embodiment 1
[0028] Take the synthesis of fluorine-containing polyether ether ketone copolymerized modified polyamic acid as an example to illustrate the synthesis of fluorine-containing polyaryl ether ketone copolymerized modified polyamic acid:
[0029] Synthesis of hydroxy-terminated fluorinated polyether ether ketone: 250ml sulfolane is used as solvent, add 8.0g 6F bisphenol A, 5.2g 4,4'-difluorobenzophenone, 2g anhydrous potassium carbonate, start stirring, and purge nitrogen Until the air is exhausted, heating is started, the temperature is raised to 120°C, the temperature is kept for 2h, and then the temperature is continued to rise to 230°C, the reaction is 3h, and the heating is stopped. After cooling, the polymer was separated and washed with boiling deionized water to remove sulfolane and inorganic salts. Finally, the product was dried in a vacuum oven at 100°C, and the hydroxyl value was determined.
[0030] Synthesis of fluorine-containing polyether ether ketone copolymerized modi...
Embodiment 2
[0035] Add 30 g of fluorine-containing polyether ketone copolymerized modified polyamic acid (molecular weight: 4281; fluorine-containing polyether ketone content of 50 mol%;) into 70 ml of N-methylpyrrolidone, dissolve at 90°C, and stir for 30 minutes to form a solution. Then add 0.3 g of low molecular weight acrylic copolymer; add 0.5 g of polyethylene wax to 90 ℃, 20 ml of xylene until completely dissolved, and then mix the sulfonated polyether ether ketone solution with the xylene solution of polyethylene wax And add 10 ml of n-butanol, keep stirring at 90°C for 3 hours. Use 30℃ cold water to quickly reduce the emulsion temperature to 45℃ through internal and external circulation cooling methods to obtain enameled wire paint.
[0036] The solid content of the enameled wire paint prepared by this example is 25%, and the rotational viscosity at 25° C. is 1380 mPas.
Embodiment 3
[0038] Add 57 grams of fluorine-containing polyether ketone ketone copolymerized modified polyamic acid (molecular weight: 19011; fluorine-containing polyether ketone ketone content 5 mol%) into a mixture of 65 ml of N-methylpyrrolidone and 5 ml of isopropanol. Dissolve at °C, stir for 30 minutes to form a solution, then add 3 g of polyamide wax and 0.5 g of polyether modified polysiloxane, add 15 ml of toluene after complete dissolution, and heat and stir at 50 °C for 3 hours. Use 30℃ cold water to quickly reduce the emulsion temperature to 45℃ through internal and external circulation cooling methods to obtain enameled wire paint.
[0039] The solid content of the enameled wire paint prepared by this example is 45%, and the rotational viscosity is 3000 mPas at 25°C.
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