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

Pending Publication Date: 2022-04-12
浙江正信石油科技有限公司
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AI-Extracted Technical Summary

Problems solved by technology

Ordinary pH test paper, because its surface is all polar small molecule dyes, has a repelling effect on white oil and cannot bind to all ionized ions
After the above two negative effects are superimposed, it is difficult for ordinary pH test paper to be effectively used in the acid-base test of white oil and deri...
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Abstract

The invention discloses a preparation method of efficient and recyclable pH test paper, and particularly relates to test paper capable of changing color in real time according to the pH of an oil product. The preparation method of the pH test paper comprises the following steps: mixing a zwitterionic compound synthesized by reaction of alkenyl pyridine and sultone with an initiator, a cross-linking agent and an amphiphilic monomer to prepare a precursor solution, uniformly soaking the precursor and a matrix, and drying in a heating or ultraviolet radiation mode to prepare the pH test paper. The test paper has the advantages of being recyclable and high in detection efficiency, and can be applied to the field of detection of white oil and derivatives thereof.

Application Domain

Material analysis by observing effect on chemical indicator

Technology Topic

Combinatorial chemistryZwitterion +6

Image

  • Efficient and recyclable pH test paper and preparation method thereof
  • Efficient and recyclable pH test paper and preparation method thereof
  • Efficient and recyclable pH test paper and preparation method thereof

Examples

  • Experimental program(8)

Example Embodiment

[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, the pH test paper is prepared. The NMR data of the chromogenic substances obtained during the period are as follows: image 3 shown.

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 drying to remove the solvent, the pH test paper is prepared.

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 paper is prepared.
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Description & Claims & Application Information

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the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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