A salt spray resistant antirust coating
An anti-rust coating and salt spray-resistant technology, applied in anti-corrosion coatings, coatings, organic chemistry, etc., can solve the problem of unsustainable long-term and stable maintenance of metal anti-rust ability, deteriorated appearance or anti-rust ability of the metal surface of the substrate, and metal facilities Easy to corrode, rust and other problems, to achieve the effect of improving salt spray and rust resistance, protection from corrosion, and good anti-corrosion effect
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Embodiment 1
[0025] see figure 1 As shown, the preparation of intermediate N3 specifically includes the following steps:
[0026] S1, weigh 0.21mol 2-aminobenzimidazole, 0.1mol terephthalaldehyde, 2.2g acid catalyst phosphotungstic acid and add it to the reaction flask, then add solvent 500ml absolute ethanol, heat to 80°C while stirring, keep under reflux The reaction was carried out for 4 hours. After the reaction was completed, it was naturally cooled to room temperature, the ethanol was removed by rotary evaporation, recrystallized with anhydrous ether, and the intermediate N1 was obtained after drying; the yield was 84.5%;
[0027] Detected by GC-MS: Intermediate N1(C 22 H 16 N 6 ) has a molecular weight of 364.154.
[0028] S2, weigh 50mmol of intermediate N1, 105mmol of sodium 5-chlorovalerate and 500ml of ethanol solution with a mass fraction of 75% and add it to the reaction flask, heat up to 85°C while stirring, and stir for 3h. 35% hydrochloric acid solution was added dropw...
Embodiment 2
[0034] see figure 2 As shown, the preparation method of the Schiff base salt spray resistance additive is as follows: take 10 mmol of the intermediate N prepared in Example 1, 20.5 mmol of 1-naphthalene formaldehyde, and 60 mg of acid catalyst phosphotungstic acid and add them to the reaction flask, and then add 100 ml of DMF as a solvent. , heated to 90°C while stirring, and kept for 5 hours. After the reaction was completed, it was cooled to room temperature naturally, ethanol was removed by rotary evaporation, recrystallized with absolute ethanol, and dried to obtain the Schiff base salt spray resistance additive of formula N1. ; The yield is 68.2%;
[0035]
[0036] Detected by GC-MS: Schiff base salt spray resistance additive N1(C 56 H 46 N 12 O2) has a molecular weight of 918.049.
Embodiment 3
[0038] see figure 2 As shown, the preparation method of the Schiff base salt spray resistance additive is as follows: take 10 mmol of the intermediate N prepared in Example 1, 21 mmol of 2-bromo-1-naphthalene carboxaldehyde, and 70 mg of acid catalyst phosphotungstic acid and add them to the reaction flask, then Add solvent 100ml DMF, heat to 90°C while stirring, keep the reaction for 5h, after the reaction, cool to room temperature naturally, remove ethanol by rotary evaporation, recrystallize with absolute ethanol, and dry to obtain a Schiff base salt-tolerant salt of formula N2 structure fog auxiliary agent; the yield is 57.2%;
[0039]
[0040] Detected by GC-MS: Schiff base salt spray resistance additive N2(C 56 H 44 Br 2 N 12 O 2 ) has a molecular weight of 1076.215.
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