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Water-based dispersive polyanion anticorrosive additive and preparation method thereof

A water-based dispersion and polyaniline technology, applied in the direction of anti-corrosion coatings, etc., can solve the problems of unfavorable environmental protection, poor water solubility, and limited application, and achieve good water dispersion, mild reaction conditions, and low raw material costs.

Inactive Publication Date: 2018-12-11
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the extremely poor water solubility of PANI, its application as a corrosion inhibitor in acidic environments is severely limited. If an organic solvent is used as a dispersant, it is not conducive to environmental protection. Further improvement in dispersion performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0014] A preparation method of water-based dispersed polyaniline anticorrosion additive, comprising the following steps:

[0015] Step 1: Take sodium lignosulfonate, phosphoric acid and deionized water, add them into the reaction bottle and stir ultrasonically to fully dissolve the sodium lignosulfonate to obtain the first reaction solution;

[0016] Step 2: adding a monomer reactant to the first reaction liquid, the monomer reactant being one or both of aniline or 4-fluoroaniline, and ultrasonically stirring to obtain a second reaction liquid;

[0017] Step 3: dissolving ammonium persulfate in deionized water and adding it to the second reaction solution for stirring reaction to obtain a third reaction solution;

[0018] Step 4: Add the third reaction solution dropwise into an organic solvent and stir to precipitate a solid precipitate, and obtain a solid crude product after filtration, wash and suction filter the solid crude product, and then vacuum-dry it.

[0019] A water...

Embodiment 1

[0032] Take 0.5 mol of sodium lignosulfonate and 0.5 mol of phosphoric acid and dissolve them in 40 mL of deionized water, add them to the reaction bottle, and stir ultrasonically at room temperature for 10 minutes to fully dissolve the sodium lignosulfonate to obtain the first reaction solution. Add 0.5 mol of aniline as a monomer reactant while stirring, continue ultrasonic stirring for 10 minutes to obtain a milky second reaction solution, weigh 0.25 mol of ammonium persulfate and add 50 mL of deionized water to dissolve to obtain ammonium persulfate solution, and mix ammonium persulfate The solution was placed in a refrigerator at 5°C for 20 minutes, and the above-mentioned reaction bottle containing the second reaction solution was placed in an ice-water bath at 2°C, and the ammonium persulfate solution was slowly added dropwise to the second reaction solution, and the second reaction solution was obtained after ultrasonic stirring for 8 hours. Three reaction liquids, the ...

Embodiment 2

[0034] Take 0.5 mol of sodium lignosulfonate and 0.25 mol of phosphoric acid and dissolve them in 40 mL of deionized water, add them to the reaction bottle, and stir ultrasonically at room temperature for 20 minutes to fully dissolve the sodium lignosulfonate to obtain the first reaction solution. Add 1 mol of aniline as a monomer reactant under stirring, continue ultrasonic stirring for 10 minutes to obtain a milky second reaction solution, weigh 0.25 mol of ammonium persulfate and add 50 mL of deionized water to dissolve to obtain an ammonium persulfate solution, and dissolve the ammonium persulfate solution Place it in a refrigerator at 5°C for 20 minutes, place the above-mentioned reaction bottle containing the second reaction solution in an ice-water bath at 5°C, slowly add the ammonium persulfate solution dropwise to the second reaction solution, and react with ultrasonic stirring for 10 hours to obtain the third Reaction solution, the third reaction solution was added dr...

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Abstract

The invention relates to the field of paintings and particularly relates to a water-based dispersive polyanion anticorrosive additive and a preparation method thereof. The preparation method comprisesthe following steps: step 1, selecting sodium lignosulfonates, phosphoric acid and de-ionized water, and performing ultrasonic agitation for dissolution; step 2, then adding aniline or 4-fluoroaniline or a mixture of aniline and 4-fluoroaniline, and performing ultrasonic agitation, thereby obtaining a mixture; step 3, reacting ammonium persulfate with the mixture obtained in the step 2, thereby obtaining a reactant liquor; and step 4, separating a solid precipitate out from the reactant liquor obtained in the step 3, and performing vacuum drying on the solid precipitate. The preparation method has the beneficial effects that natural reproduceable papermaking byproduct sodium lignosulfonates is adopted as a modifier and is blended with aniline and derivatives thereof for reaction, so as toobtain the modified water-based dispersive polyanion anticorrosive additive. The additive has favorable water dispersion property and excellent corrosion prevention effect. According to the scheme, adopted reaction conditions are mild, and the raw material cost is low. The preparation method is simple to operate and easy to realize.

Description

technical field [0001] The invention relates to the field of coatings, in particular to a water-based dispersed polyaniline anticorrosion additive and a preparation method thereof. Background technique [0002] Metal materials, as one of the basic materials in construction, manufacturing and various heavy industries, play an irreplaceable and important role. When a metal material is exposed to a certain environment (such as temperature, humidity, and pH value of the environment), a chemical or electrochemical reaction will occur between the metal and the surrounding environment, and the process of damage and loss of the metal material will occur. Metal corrosion is the most serious problem existing in metal materials. It generally exists in the fields of national defense construction and national economic construction, seriously restricts the application range and service life of metals, and directly or indirectly causes huge national economic losses. According to relevant ...

Claims

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Application Information

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IPC IPC(8): C09D5/08C08G73/02
CPCC08G73/026C08G73/0266C09D5/08
Inventor 魏方芳邓雅君徐艳莲
Owner FUJIAN NORMAL UNIV
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