Method for preparing functional membrane of ion-selective electrode of cationic surfactant

An ion-selective electrode and surfactant technology, which is applied in the field of preparation of cationic surfactant ion-selective electrode functional membranes, can solve the problems of harsh conditions, wide product molecular weight distribution, complicated preparation process of modified membrane electrodes, etc., and achieves the reaction conditions Gentle, easy to operate, energy saving effect

Active Publication Date: 2012-03-07
CHINA RES INST OF DAILY CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The preparation process of the above-mentioned modified membrane electrode is relatively complicated, the conditions are relatively harsh, and the molecular weight distribution of the product is relatively wide

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh 0.1 mol of polyvinyl chloride (molecular weight is 50000, the number of moles of polyvinyl chloride is calculated by the number of moles of a single vinyl chloride unit) and 0.3 mol of phenylethylamine, transfer them into a 250mL ground-necked flask, add N,N-dimethyl methyl formamide to completely dissolve it, and react at a constant temperature of 110°C for 120 hours. The reaction product was precipitated with methanol, filtered, and the resulting solid was washed 5 times with deionized water. Dry at 60°C for 12 hours to obtain solid aminated polyvinyl chloride. 1 g of the aminated polyvinyl chloride solid was dissolved in a mixed solvent of tetrahydrofuran and cyclohexanone, then mixed with 10 g of chlorosulfonic acid and 30 g of acetic anhydride, and reacted at a constant temperature of 60° C. for 72 hours. The reaction was precipitated with methanol and washed 5 times with deionized water. Finally, it is dried at 60° C. for 12 hours to obtain a sulfonated su...

Embodiment 2

[0024] Weigh 0.1 mol of polyvinyl chloride (molecular weight is 250000, the number of moles of polyvinyl chloride is calculated as the number of moles of a single vinyl chloride unit) and 0.02 mol of benzylamine, transfer them into a 250 mL ground-necked flask, add tetrahydrofuran to make it completely dissolved, The reaction was carried out at a constant temperature of 50° C. for 48 hours. The reaction product was precipitated with deionized water, filtered, and the obtained solid was washed 9 times with deionized water. Dry at 40°C for 24 hours to obtain aminated polyvinyl chloride solid. Dissolve 1 gram of the above-mentioned aminated polyvinyl chloride solid in a mixed solvent of tetrahydrofuran and N,N-dimethylformamide, then mix it with 40 grams of oleum and 10 grams of formyl chloride, and react at a constant temperature of 40°C for 168 hours . The reactant was precipitated with deionized water, and then washed 9 times with deionized water. Finally, it was dried at 4...

Embodiment 3

[0026] Weigh 0.1 mol of polyvinyl chloride (molecular weight is 150000, and the number of moles of polyvinyl chloride is calculated as the number of moles of a single vinyl chloride unit) and 0.03 mol of amphetamine, transfer them into a 250 mL ground-necked flask, add dimethyl sulfoxide and chlorobenzene It was completely dissolved in a mixed solvent, and reacted at a constant temperature of 80°C for 24 hours. The reaction product was precipitated with ethanol, filtered, and the resulting solid was washed 9 times with deionized water. Dry at 50°C for 18 hours to obtain solid aminated polyvinyl chloride. 1 gram of the aminated polyvinyl chloride solid was dissolved in tetrahydrofuran, then mixed with 30 grams of liquid sulfur trioxide and 50 grams of propionyl bromide, and reacted at a constant temperature of 50° C. for 336 hours. The reaction was precipitated with ethanol and washed 9 times with deionized water. Finally, it was dried at 50° C. for 18 hours to obtain a sulfo...

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Abstract

The invention discloses a method for preparing a functional membrane of an ion-selective electrode of a cationic surfactant, which comprises the following steps: adding polyvinyl chloride and aminating agent into a reaction vessel, wherein the molar ratio of the polyvinyl chloride to the aminating agent is 1:0.2-5; adding organic solvent into the obtained mixture so as to dissolve the obtained mixture; carrying out reaction on the dissolved mixture for 24 to 120 hours at a temperature of 20 to 140 DEG C; adding precipitator into the obtained product to precipitate; then filtering the obtainedproduct so as to obtain a solid body; washing the obtained solid body with deionized water; drying the solid body for 12 to 48 hours at a temperature of 20 to 60 DEG C so as to obtain an solid aminated polyvinyl chloride; mixing the solid aminated polyvinyl chloride, sulphonating agent and end-blocking agent, wherein the mass ratio of the solid aminated polyvinyl chloride to the sulphonating agent to the end-blocking agent is 1:10-50:10-50; adding organic solvent into the obtained mixture so as to dissolve the mixture; carrying out reaction on the dissolved mixture for 72 to 336 hours at a temperature of 40 to 60 DEG C; precipitating the obtained product by precipitator; filtering the obtained mixture so as to obtain a solid body; washing the solid body with deionized water; drying the obtained solid body for 12 to 48 hours at a temperature of 20 to 60 DEG C so as to obtain the functional membrane of the ion-selective electrode of the cationic surfactant. The invention has the advantages of simple preparation, mild reaction condition, and narrow molecular weight distribution (MWD) of product.

Description

technical field [0001] The invention relates to a preparation method for preparing a cationic surfactant ion-selective electrode functional membrane from a modified hydrophobic high-molecular-weight polymer. Background technique [0002] Surfactant is an amphiphilic substance that can greatly reduce the surface tension of the system when it is added very little, and can form various aggregates in the system after reaching a certain concentration. It is widely used in daily life, detergent, lubricating oil and other industrial fields and related high-tech fields, known as "industrial monosodium glutamate". Due to the extensive use of surfactants, pollution problems such as foam and over-nutrition caused by it can be found in rivers, lakes, oceans and other environments. Therefore, we not only need to study the biodegradability of surfactants, but also need to establish their detection methods. [0003] At present, the detection method of surfactant is mainly two-phase titra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F14/06C08F8/36C08F8/32C08L27/22G01N27/333
Inventor 杜志平薛伟王万绪王俊伟
Owner CHINA RES INST OF DAILY CHEM IND
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