Anticorrosive coating with polyaniline covering gas-phase nano-silica and preparation method thereof

A technology of silica and anti-corrosion coatings, which is applied in the direction of anti-corrosion coatings, epoxy resin coatings, polyurea/polyurethane coatings, etc., which can solve the difficulties of large-scale production of electrochemical oxidation polymerization synthesis and the high cost of PANI coating preparation , demulsifier volatilization and filtrate discharge environmental pollution, etc., to avoid insoluble and infusible, low cost and good anti-corrosion performance

Inactive Publication Date: 2013-07-17
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Domestic research on anti-corrosion coatings is also very involved, but not many can be put into practical application
Although the first domestic PANI anti-corrosion coating production line has also been invested and built in Changsha, Hunan, due to the poor dissolution and processing performance of PANI, the preparation process of PANI powder has complicated processes and high costs, and the volatilization of the demulsifier and the discharge of the filtrate during the demulsification stage There are problems such as environmental pollution in the aspects such as, make the preparation cost of PANI coating remain high, large-scale industrial application is greatly restricted
[0003] The above-mentioned problems that the particle hardness of PANI obtained by chemical oxidation polymerization is large and difficult to disperse in the coating matrix are still unavoidable problems in the PANI of electrochemical oxidation polymerization, and the synthetic production method of electrochemical oxidation polymerization is difficult to scale up

Method used

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  • Anticorrosive coating with polyaniline covering gas-phase nano-silica and preparation method thereof
  • Anticorrosive coating with polyaniline covering gas-phase nano-silica and preparation method thereof
  • Anticorrosive coating with polyaniline covering gas-phase nano-silica and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Reaction conditions: the reaction temperature is 3°C, the molar ratio of oxidant to aniline monomer is 1:1, the reaction medium is 1mol / L hydrochloric acid solution, 1mL aniline to 9g silica.

[0035]Add silicon dioxide in three different ways under the above polymerization conditions: (1) according to the aniline monomer pre-adsorption method of the present invention, that is, first dilute aniline with ethanol, and soak the silicon dioxide with the solution, and then put it into an oven Baking for 0.5 hours to make the ethanol evaporate completely, the aniline will adhere to the surface of the silica particles, then put it into the acid medium, and add an oxidant to polymerize; (2) direct addition of aniline monomer, that is, directly add aniline to the reaction In the medium, stir for 5 minutes to make it evenly mixed, then add an oxidizing agent to carry out polymerization; (3) blending method after aniline polymerization, that is, first carry out chemical oxidation p...

Embodiment 2

[0040] The reaction steps are as follows in the embodiment:

[0041] (1) Pre-attachment of aniline monomer: first dilute aniline and aniline derivatives with ethanol into an aniline solution, and use the aniline solution to infiltrate the gas-phase nano-silica. After infiltration, the gas-phase nano-silica is baked in an oven until ethanol After the volatilization is gone, the gas-phase nano-silica is put into the acidic medium and stirred evenly after baking;

[0042] (2) Polymerization reaction: The above system was slowly dripped into the oxidant solution at a constant temperature of 3°C for reaction. The molar ratio of oxidant to aniline monomer was 1:1, and the reaction medium was 1mol / L hydrochloric acid, and kept stirring until the reaction was complete;

[0043] (3) Post-treatment: filter the reaction solution, wash until the lotion is colorless, and dry to obtain the original polyaniline-coated silica composite.

[0044] According to the above steps, four kinds of po...

Embodiment 3

[0050] The aniline monomer consumption is 10% embodiment product carries out infrared spectrum test with Nicolet FT-IR Nexsus470 instrument, gained infrared spectrum is shown in figure 2 . at 3440cm -1 ~3445cm -1 There is a broad absorption peak on the left and right, which is the characteristic absorption peak of –NH– stretching vibration, indicating that imino (–NH–), amino (–NH 2 ) group exists. 1470cm -1 ~1560cm -1 The absorption peaks are the quinone (C=C) and benzene (C–C) stretching vibrations of the aromatic carbon on the benzene ring in the polymer molecular chain, 1000cm -1 left and right and 780cm -1 The left and right absorption peaks correspond to the in-plane and out-of-plane bending vibration characteristic absorption bands of the benzene ring. Explain the presence of benzene rings in the molecular chain. at 1300cm -1 The absorption peak at corresponds to the C–N stretching vibration. These absorption characteristics are the same as those of pure poly...

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Abstract

The invention belongs to the field of coatings and particularly relates to a preparation method and application of an anticorrosive additive with polyaniline covering gas-phase nano-silica. The anticorrosive additive has a core-shell structure, the core is nano-silica particles, the shell is polyaniline, and the thickness of polyaniline covering the surface of the gas-phase nano-silica particles is even. In terms of total mass of the anticorrosive additive, the anticorrosive additive comprises, by weight, 0.25-20% of polyaniline. Conductivity of the anticorrosive additive reaches 10-1S*cm-1. The preparation method includes: aniline monomer pre-attachment, polyreaction, post-treatment, undoping and secondary doping. The invention further comprises preparation of an anticorrosive coating with polyaniline covering gas-phase nano-silica. The anticorrosive coating can be sprayed as primer of various metallic matrixes, a compact anticorrosive coating can be achieved by baking the sprayed anticorrosive coating, and metal can be protected effectively.

Description

technical field [0001] The invention belongs to the field of anti-corrosion coatings, in particular to a polyaniline-coated silicon dioxide anti-corrosion coating and a preparation method thereof. Background technique [0002] Since DeBerry et al. (see Journal of the Electrochemcal Society, 1985, 132(5): 1022-1026.; The Electrochemical Society, 1984, 84(3): 308-322) discovered in 1985 that polyaniline (PANI) has excellent Since its anti-corrosion performance, countries all over the world have started to study PANI as a mild agent for anti-corrosion coatings on metal surfaces. The reason why PANI anti-corrosion coatings arouse people's research enthusiasm is that it has good compatibility with the matrix polymer. At the same time, anti-corrosion coatings have antistatic properties. When used in seawater, they also have the effect of preventing marine microorganisms from polluting. At present, many commercialized PANI anticorrosion coatings have come out, but their applicatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D7/12C09D5/08C09C1/28C09C3/10C08G73/02C09D175/04C09D163/00C09D133/00
Inventor 黄美荣谷国利李新贵刘涛涛
Owner TONGJI UNIV
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