Efficient and recyclable pH test paper and preparation method thereof
A ph test paper, an efficient technology, is applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by making materials undergo chemical reactions. It can solve problems such as inability to combine ions, inability to carry, and white oil repulsion Achieve high-efficiency color rendering, easy to carry, and large degrees of freedom
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[0027] Example 1:
[0028] Add 4-vinylpyridine (10.51 g, 0.1 mol), butanesultone (17.70 g, 0.13 mol), and dry toluene into a 250-ml three-necked flask in turn, stir until fully mixed, and pass nitrogen gas while stirring. The system was reacted at 100°C for 24h. After the completion of the reaction, white crystals of 4-vinyl-1-(3-sulfobutyl)pyridine were precipitated in the solution. Next, the solution was subjected to suction filtration, and the solution was continuously rinsed with butanone for several times during suction filtration to collect white crystals.
[0029] 4-Vinyl-1-(3-sulfobutyl)pyridine (1.22 g, 0.005 mol) was poured into dichloromethane to prepare a 1 mol / L solution. Next, amylacrylamide (0.71g, 0.005mol), benzoin (0.0122g) and N,N-methylenebisacrylamide (0.15g) were added in sequence, and the solution was evenly dropped on neutral glass fiber filter paper after thorough mixing. On, react under 365nm UV lamp for 40min. After drying to remove the solvent, ...
Example Embodiment
[0030] Example 2:
[0031] Add 2,4-vinylpyridine (13.11g, 0.1mol), butanesultone (34.04g, 0.13mol), and dry toluene into a 250ml three-necked flask in turn, stir until fully mixed, and pour in while stirring Nitrogen. The system was reacted at 115°C for 30h. After the completion of the reaction, white crystals of 2,4-divinyl-1-(3-sulfobutyl)pyridine were precipitated in the solution. Next, the solution was subjected to suction filtration, and the solution was continuously rinsed with butanone for several times during suction filtration to collect white crystals.
[0032] 2,4-Divinyl-1-(3-sulfobutyl)pyridine (1.34 g, 0.005 mol) was poured into dichloromethane to prepare a 1 mol / L solution. Next, amyl acrylamide (0.71 g, 0.005 mol), benzoin butyl ether (0.0134 g) and N,N-methylenebisacrylamide (0.15 g) were added in sequence, and the solution was uniformly dropped on neutral glass after thorough mixing. On fiber filter paper, react under 365nm UV lamp for 30min. After dryin...
Example Embodiment
[0033] Example 3:
[0034]Add 2-vinylpyridine (10.51g, 0.1mol), caprolactone (21.35g, 0.13mol), and dry toluene into a 250ml three-necked flask in turn, stir until fully mixed, and pass nitrogen gas while stirring. The system was reacted at 75°C for 20h. After the completion of the reaction, white crystals of 2-vinyl-1-(3-sulfohexyl)pyridine were precipitated in the solution. Next, the solution was subjected to suction filtration, and the solution was continuously rinsed with butanone for several times during suction filtration to collect white crystals.
[0035] Pour 2-vinyl-1-(3-sulfohexyl)pyridine (1.35 g, 0.005 mol) into chloroform to prepare a 5 mol / L solution. Next, dodecyl acrylamide (0.71 g, 0.005 mol), benzoin dimethyl ether (0.0135 g) and N,N-methylenebisacrylamide (0.15 g) were added in sequence, and the solution was uniformly dropped on the On cotton spun non-woven fabric, react under 365nm UV lamp for 40min. After drying to remove the solvent, the pH test pape...
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