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A kind of preparation method of methionine/polyaniline anticorrosion composite material

A technology of methionine and composite materials, which is applied in the direction of anti-corrosion coatings, epoxy resin coatings, coatings, etc., can solve the problems of hindering the migration of inhibitors, weakening of polyaniline barrier performance, and poor solubility, so as to improve solubility and Dispersion, improvement of anti-corrosion performance, improvement of poor mechanical properties

Active Publication Date: 2020-11-27
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the main problems affecting the effective application of polyanilines are: their relatively low electrical conductivity compared to metals, and their poor solubility in all commonly used solvents as well as low
The unique atoms such as N, O, and S present in the compound, as well as the double bonds in its structure and the p electrons present on the aromatic ring determine the adsorption efficiency and adsorption mechanism, because their presence is beneficial to the adsorption of inhibitors, but the existing anticorrosion The material preparation process is relatively complicated, and the anti-corrosion performance needs to be improved
[0004] Chinese patent CN102732128A discloses a nano-polyaniline anti-corrosion coating, which is composed of A component and B component in a mass ratio of 1-5:1; wherein, A component: 60-95 parts of epoxy anti-corrosion coating; doped state 0.5-10 parts of polyaniline nanospheres; 0.5-5 parts of diluent; 0.5-10 parts of dispersant; component B: 10-40 parts of curing agent; 2 O / FeCl 2 / H 2 o 2 System preparation of polyaniline, its main defect is that it has little effect on improving the mechanical properties of polyaniline itself, and is not conducive to the dispersion of inhibitors, hinders the migration of inhibitors, and weakens the barrier properties of polyaniline itself

Method used

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  • A kind of preparation method of methionine/polyaniline anticorrosion composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Weigh 0.125g of sodium lauryl sulfate and dissolve it in 12ml of deionized water, stir evenly, as an emulsifier, then take 0.98mL of aniline and 2.46mL of ethylbenzene, stir to mix evenly, as a hydrophobic substance, and then add the hydrophobic mixture to ten Dialkyl sodium sulfate aqueous solution, while adding 0.016g methionine as inhibitor. The mixed solution was stirred at room temperature for 1 h at a rotation speed of 1000 rpm, and then emulsified by ultrasonication for 240 seconds in an ice bath. After emulsification, an aqueous solution of polyvinyl alcohol (10 wt %) was mixed with the microemulsion. Weigh 2.46g of ammonium persulfate and dissolve it in 3.34ml of deionized water. The solution is completely dissolved. At room temperature, the ammonium persulfate aqueous solution is added dropwise to the above mixed solution. After polymerization, wash with deionized water several times until the upper liquid is clear. Finally, the synthesized solution was cent...

Embodiment 2

[0030] Weigh 0.125g of sodium lauryl sulfate and dissolve it in 12ml of deionized water, stir evenly, as an emulsifier, then take 0.98mL of aniline and 2.46mL of ethylbenzene, stir to mix evenly, as a hydrophobic substance, and then add the hydrophobic mixture to ten In the aqueous solution of dialkyl sodium sulfate, 0.032 g of methionine was simultaneously added as an inhibitor. The mixed solution was stirred at room temperature for 1 h at a rotation speed of 1000 rpm, and then emulsified by ultrasonication for 240 seconds in an ice bath. After emulsification, an aqueous solution of polyvinyl alcohol (10 wt %) was mixed with the microemulsion. Weigh 2.46g of ammonium persulfate and dissolve it in 3.34ml of deionized water. The solution is completely dissolved. At room temperature, the ammonium persulfate aqueous solution is added dropwise to the above mixed solution. After polymerization, wash with deionized water several times until the upper liquid is clear. Finally, the ...

Embodiment 3

[0033] Weigh 0.125g of sodium lauryl sulfate and dissolve it in 12ml of deionized water, stir evenly, as an emulsifier, then take 0.98mL of aniline and 2.46mL of ethylbenzene, stir to mix evenly, as a hydrophobic substance, and then add the hydrophobic mixture to ten In the dialkyl sodium sulfate aqueous solution, add 0.048g methionine simultaneously as inhibitor. The mixed solution was stirred at room temperature for 1 h at a rotation speed of 1000 rpm, and then emulsified by ultrasonication for 240 seconds in an ice bath. After emulsification, an aqueous solution of polyvinyl alcohol (10 wt %) was mixed with the microemulsion. Weigh 2.46g of ammonium persulfate and dissolve it in 3.34ml of deionized water. The solution is completely dissolved. At room temperature, the ammonium persulfate aqueous solution is added dropwise to the above mixed solution. After polymerization, wash with deionized water several times until the upper liquid is clear. Finally, the synthesized solu...

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Abstract

The invention relates to a preparation method of a methionine / polyaniline anticorrosive composite material. An in-situ oxidative polymerization method is adopted for synthesis, and the preparation method comprises the following specific steps: with an aqueous solution of sodium dodecyl sulfate as an emulsifier and a mixed solution of aniline and ethylbenzene as a hydrophobe, adding the hydrophobeinto the emulsifier, and adding methionine as an inhibitor to obtain a mixed solution; uniformly stirring the mixed solution, and performing ultrasonic emulsification under an ice bath condition to obtain a microemulsion; mixing an aqueous polyvinyl alcohol solution with the microemulsion, then adding an aqueous ammonium sulfate solution, performing polymerization, centrifuging a polymerized solution, washing and drying a product to obtain the methionine / polyaniline anticorrosive composite material. Compared with the prior art, methionine / polyaniline synthesized by the preparation method provided by the invention has the advantages as follows: the methionine / polyaniline is in a form of nanospheres, the anticorrosive property is improved, the defects of poor mechanical properties and low dispersibility of polyaniline can be improved, dispersion of the inhibitor is facilitated, a release process of the inhibitor is controllable, and the preparation method is suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and in particular relates to a preparation method of a methionine / polyaniline anticorrosion composite material. Background technique [0002] Metal corrosion has a significant impact on the cost and reliability of industrial equipment, the environment and human safety, so the corrosion of metals is one of the most important problems in the world. In recent years, polyaniline (PANI) has been considered as one of the most promising anticorrosion materials because of its easy synthesis, low monomer cost, tunable properties, and better stability. However, the main problems affecting the effective application of polyanilines are: their relatively low electrical conductivity compared to metals, and their poor and low solubility in all commonly used solvents. By selecting suitable dopants and doping levels, as well as controlling its structure during the synthesis process, the conductivity...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D163/00C09D179/08C09D5/08C09D7/63C08G73/02
CPCC08G73/0266C09D5/08C09D7/63C09D163/00C08L79/08C08K5/3725
Inventor 王晓岗车颖利
Owner TONGJI UNIV
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