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Anti-corrosion additive for polyaniline-coated fumed nano-silica, preparation method and application thereof

A technology of nano-silica and silica, applied in the direction of anti-corrosion coatings, etc., can solve the problems of difficult dispersion, high cost, and not much, and achieve the effect of improving difficult dispersion, excellent film-forming performance, and reducing coating cost

Inactive Publication Date: 2015-08-19
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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  • Anti-corrosion additive for polyaniline-coated fumed nano-silica, preparation method and application thereof
  • Anti-corrosion additive for polyaniline-coated fumed nano-silica, preparation method and application thereof
  • Anti-corrosion additive for polyaniline-coated fumed nano-silica, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Vapor SiO 2 The particles are small and have a porous structure with a large specific surface area, so the single-layer PANI is covered with gas-phase SiO 2 On the surface, the required proportion of PANI is larger to achieve good conductivity.

[0035] The reaction steps are as follows:

[0036](1) Adsorption of aniline monomer: Dilute aniline with ethanol to form aniline solution, wet the silica powder with a small amount of aniline solution, add it to the aniline monomer, and stir evenly;

[0037] (2) Synthesis of polyaniline-coated fumed silica: keep the temperature at 3°C, drop the oxidant solution at a rate of one drop every 5 seconds, and keep stirring until the reaction is complete; and the molar ratio of oxidant to aniline monomer is 1 : 1, the reaction medium is the hydrochloric acid solution of 1mol / L;

[0038] (3) Wash the reaction with deionized water until the washing liquid is colorless to obtain the original ecological PANI-coated fumed nano-silica co...

Embodiment 2

[0045] The gas-phase SiO containing 33% polyaniline cladding layer synthesized by embodiment 1 2 The coating is dispersed in water for laser particle size analyzer test, and gas phase SiO can be obtained 2 Particle size distribution curves before and after coating, see figure 1 . Compared with uncoated polyaniline fumed silica, fumed SiO 2 After coating polyaniline, the shape of the particle size distribution curve is basically unchanged, but the particle size distribution curve after coating is shifted to the direction of large particle size for a certain distance, and its peak value is shifted from 78nm to 417nm. It can be seen that the gas phase SiO 2 The average particle size is 78nm, PANI coated gas phase SiO 2 The average particle size of the anti-corrosion additive is 417nm, indicating that SiO 2 The particle surface is indeed coated with a layer of polymer. If calculated according to the spherical cladding, the thickness of the cladding layer can be calculated, wh...

Embodiment 3

[0047] The PANI-coated nano-silica anti-corrosion additive is subjected to post-treatments such as drying and grinding, and it is added as an anti-corrosion functional component to the coating matrix such as polyurethane (PU) polyacrylate and other film-forming substances to form a coating system. The formula is shown in the table 2. In the paint making, when PANI is coated with fumed nano-silica anticorrosion additive, it is found that the anticorrosion additive is very easy to grind, and is obviously easier to handle than pure PANI particles, indicating that the synthetic coating of the present invention has greatly improved the reliability of PANI. Processability. PANI coated gas phase nano-SiO 2 Anti-corrosion additives are submicron particles, fine and easy to disperse, easy to form a denser anti-corrosion layer, and can play the role of anti-sedimentation agent during the coating preservation process.

[0048] Table 2 has the primer coating formula of anticorrosion fun...

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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, 9-50% 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, a quite compact and even 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, and in particular relates to a preparation method and application of an anti-corrosion additive coated with polyaniline gas-phase nano silicon dioxide. 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 coa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D5/08C08G73/02C08K3/36
Inventor 黄美荣谷国利李新贵刘涛涛谷朋泰
Owner TONGJI UNIV
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