Preparation method of washable hair dye

[0025] Example 1

[0026] Weigh 16g potassium fluoride dihydrate, dissolve potassium fluoride dihydrate in 300mL distilled water in a beaker, add 80g neutral alumina to the beaker, heat the beaker to 70℃, start the magnetic stirring device, Stir at the speed of 1 min, heat preservation and stir for 1.0 h to obtain a mixed product; transfer the mixed product to a rotary evaporator, set the temperature to 80 ℃, and rotate at a speed of 110 r / min for 15 min to obtain a solid product. In an oven, heat to 100°C and dry for 2 hours to obtain a dried solid, then place the dried solid in a muffle furnace, heat to 450°C, heat and calcine for 3 hours to obtain a catalytic carrier; put 40g boric acid in a beaker The anhydride was dissolved in 180mL dimethylformamide, 100mL of acetylacetone was added to the beaker, the beaker was heated to 65℃ in the water bath, and 270mL of tributyl borate was added to the beaker, stirred for 10min to obtain the premix, and 270mL3- Methoxy-4-hydroxybenzalde

[0027] Example 2

[0028] Weigh 17 g of potassium fluoride dihydrate, dissolve potassium fluoride dihydrate in 310 mL of distilled water in a beaker, add 82 g of neutral alumina to the beaker, heat the beaker to 73°C, start the magnetic stirring device to 325r / Stir at the speed of 1 min, heat preservation and stir for 1.0 h to obtain a mixed product; transfer the mixed product to a rotary evaporator, set the temperature to 85°C, and rotate at 115r / min for 16 minutes to obtain a solid product. In an oven, heat to 105°C and dry for 2.5 hours to obtain a dried solid, then place the dried solid in a muffle furnace, heat to 465°C, heat and calcine for 3.5 hours to obtain a catalytic carrier; 45g boric anhydride is dissolved in 190mL dimethylformamide, add 105mL acetylacetone to the beaker, heat the beaker to 68℃ in the water bath, then add 285mL tributyl borate to the beaker, stir for 13min to obtain the premix, add to the premix 285mL of 3-methoxy-4-hydroxybenzaldehyde, stirred fo

[0029] Example 3

[0030] Weigh 18g potassium fluoride dihydrate, dissolve potassium fluoride dihydrate in 320mL distilled water in a beaker, add 85g neutral alumina to the beaker, heat the beaker to 75°C, start the magnetic stirring device, and set it to 350r / Stir at the speed of 1 min, heat preservation and stir for 1.5 h to obtain a mixed product; transfer the mixed product to a rotary evaporator, set the temperature to 90 ℃, and rotate at a speed of 120 r / min for 18 min to obtain a solid product. In an oven, heat up to 110°C and dry for 3 hours to obtain a dried solid, then place the dried solid in a muffle furnace, heat up to 480°C, heat and calcine for 4 hours to obtain a catalytic carrier; put 50g of boric acid in a beaker The anhydride was dissolved in 200mL dimethylformamide, 110mL of acetylacetone was added to the beaker, the beaker was heated to 70℃ in the water bath, and 300mL of tributyl borate was added to the beaker, stirred for 15min to obtain the premix, and 30