Method for preparing surface active agent ion selection electrode functional film material

Abstract

A preparation method of surfactant ion selective electrode functional membrane material is to put polyvinyl chloride and piperazine derivatives in a molar ratio of 1:3 to 3:1 into a reactor, add an organic solvent to fully dissolve it, and then React at a constant temperature of 20-80°C for 24-480 hours, precipitate the reaction product with methanol, filter, wash the solid with potassium hydroxide solution, deionized water and methanol solution, and dry the obtained amine Put polyvinyl chloride solid and methyl iodide in a sealed reactor at a molar ratio of 1:3 to 3:1, add an organic solvent to dissolve it completely, and react at a constant temperature of 20 to 100°C for 12 to 84 hours. The reaction product is precipitated with methanol, filtered, and the obtained solid is washed with potassium hydroxide solution, deionized water and methanol solution respectively, and dried to obtain the surface active agent ion selective electrode functional membrane material. The invention has the advantages of mild reaction conditions, easy operation and large-scale industrial production.

Description

technical field [0001] The invention belongs to a preparation method for preparing an anionic surfactant ion selective electrode functional membrane material by modifying polyvinyl chloride (PVC). Background technique [0002] Surfactant ion selective electrode is an electrochemical sensor, which can generate potential response to surfactant ions in solution, so as to determine the ionic activity of surfactant by measuring potential, because the measured solution is generally relatively Dilute, so the activity is approximately equal to the concentration, so it can be used to determine the concentration of surfactants. The vast majority of surfactant ion selective electrodes are membrane electrodes, and the functional membrane is the core part of the surfactant ion selective electrode. The most basic raw materials for preparing electrode functional membranes are PVC and plasticizers. The traditional preparation of functional film is to dissolve PVC and plasticizer in some or...

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Problems solved by technology

As mentioned above, the modified membrane electrode material is prepared by the polymerization of vinyl chloride, and the molecular weight of the polymer is difficult to control during the reaction.

In Langmuir (2005, 21, 6154-6156.), the modified membrane electrode functional material is directly prepared by reacting polyvinyl chloride and trimethylamine, which overcomes the disadvantage that the molecular weight of vinyl chloride polymerization is difficult to control; but its reaction conditions are relatively harsh , this is because trimethylamine is a gas at room temperature, it needs to be condensed to -20°C during the reaction to control the amount of reaction, and the sealing of the reactor will also greatly affect the reaction