Protective ground paint

FIELD: corrosion protection.

SUBSTANCE: protective ground paint for painting coiled metal and electrochemical protection of bridges, power lines, and other long term-use metallic structures contains, wt %: epoxide resin 9.0-29.0, polyamide resin 3.0-9.5, pigment 23.0-36.0, zinc nanoparticle preparation 3.0-5.0, filler 13.0-23.2, and solvent - the balance. Zinc nanoparticle preparation is introduced in the form of (0.4-4)x·10-3 M solution in isooctane.

EFFECT: enhanced protective properties.

2 tbl, 4 ex

 

The invention relates to the production technology of paint and varnish materials for the painting of the rolled metal, electrochemical corrosion protection of bridges, power lines and other metal structures for long-term use.

The protective properties of polymeric coatings, as a rule, are determined by the amount of physical-mechanical properties:

adhesion and mechanical;

electrochemical and electrical insulation;

the ability of coatings (polymer film + pigment) electrochemically to protect the metal;

the ability of films to slow down the diffusion and transfer of corrosive chemicals to the metal surface.

Primer, contact directly with the metal, should provide strong adhesion, high protective properties.

Protective primer provide cathodic polarization of the metal due to the high content of metal powders, which, dissolved electrochemically protects the metal surface.

As metal powders using zinc, zinc alloys with magnesium, lead, aluminum and others. These powders have a more negative potential than the steel (iron). This requires a high degree of filling powders (up to 90 wt.%). This amount of zinc significantly impairs adhesion and increases permeability. In addition to odnoy protection protective primer is additionally influenced by the action of the products of the anodic dissolution of powders and become impenetrable.

Known protective primer EP-057 THE 6-10-1175-75 representing a suspension of zinc powder in a solution of epoxy resin e-41, as hardener used polyamide resin IS 200, the filler is bentonite. Zinc powder is introduced in the amount of 67 wt.%. The coating thickness of 100-250 μm. When you improvement by replacing the spherical particles on scales Zn is possible to reduce the content of powder in the soil up to 30 wt.%. However, this is not fundamentally solve the problem of creating a corrosion resistant primers with a small quantity of powder and obtain thin coatings.

An object of the invention is the creation of a sacrificial primer with high corrosion properties.

To achieve a technical result sacrificial primer containing an epoxy, a polyamide resin, zinc powder, a filler and a solvent, as the zinc powder contains a preparation of zinc particles with diameter of the order of 10-9m concentration (0.4 to 4)·10-3mol/DM3in isooctane, additionally contains a pigment:

the components of the primer are taken in the ratio, wt.%:

Epoxy resin 9,0-29,0

The polyamide resin of 3.0 to 9.5

Pigment 23,0-36,6

Filler 13,0-23,2

The drug particles of zinc 3,0-5,0

Solvent - rest

In the last decade successfully applied nanosized metal is their particles after ultra-small aggregates of metal with a diameter of the order of nanometers (1 nm = 10-9m).

Patented method of preparation of nanostructured metal particles by metal ion reduction in the system of reverse micelles (EN 2147487, 2000). The method includes preparing back-micellar dispersion of reducing agent based on the solution of surface-active substances (surfactants) in a non-polar solvent, as the reductant used substance from the group of flavonoids, as the use of surfactants bis-2-ethylhexylphthalate sodium, and as a non-polar solvent used saturated hydrocarbons. The method allows to increase the lifetime and the rate of formation obtained nanostructured metal particles and to eliminate the need to create anaerobic conditions while sinese. The concentration of surfactant in the limiting hydrocarbon is 0.05-2 M concentration of a substance from the group of flavonoids in reverse micellar dispersion varies from 3·10-4up to 3·10-3M

The ratio of molar concentrations of water and surfactant in the reverse micelle dispersion aqueous solution of metal salt varies in the range of 0.9 to 1.2.

As metal ions using silver ions, copper, iron, Nickel, zinc.

The preparation of nanostructured particles of zinc is a clear liquid dark brown color,the position of the main absorption bands 530-560 nm, the optical density is not less than 0.04 relates. unit, the concentration of zinc nanoparticles of 0.4-4·10-3mol/DM3. You can use Zn nanoparticles in argon.

As the epoxy resin used resin e-41 in the solution of THE 6-10-607-78, resin ED-8, Epicot 1001 firm Shell.

As the polyamide resin used resin IN THE 300 6-10-1108-76, 200 TU 6-10-1304, Versamid 115 and 125 of the firm Schering, Germany.

As a pigment used red iron oxide pigment, chromium oxide, and others. In use as a filler talc, micro-talc, Benton 34 and others. Preparation of protective primer traditionally: obtain a pigment paste in speed dissolver, then the dispersion in a bead mill until the desired degree of milling, mixing with the preparation of the nanoparticles of the zinc in solution with xylene. Primer should be applied by spray, roller or brush in two layers with an interval of 1-2 hours. Table 1 shows the formulation of a sacrificial primer, table 2 shows the indicators of physico-mechanical properties of coatings based on it.

Corrosion and electrochemical testing of coatings with the use of the drug nanoparticles of zinc were compared with the coating on the basis of serial primer EP-057 at the research Institute of Corrosion. Samples with coatings were placed in a borate buffer solution (pH 3.5). Coatings were applied to the plates of carbon steel is steel (150× 20×2), the area of the test surface was 10 cm2. At the moment of immersion of the samples in the solution samples were installed capacity of dissolution of zinc (-0,86). Early signs point violations pokrycia filled with powdered zinc, appeared after 72 hours of exposure, and after 15 hours the floor is completely destroyed. The coating containing nanoparticles of zinc, point violations observed after 300 hours exposure, the complete destruction of the coating was observed after 500 hours exposure.

Table 1.

The formulation of protective coatings, wt.%.
Name of the componentNo. 1No. 2No. 3the placeholder
Epoxy resin e-41 Epoxy resin ED-89,020299,3
Polyamide resin IS 200 (100%)-3003,06,69,53.04 from
Oxide of chromium 23  
Red iron oxide pigment36,6 24 
The micro-talc18,322,2  
Talc  12 
Benton 341111,02
Powder zinc   66,96
Preparation of nanoparticles of zinc345 
The ethyl cellosolve0,50,50,50,3
Acetone666to 4.62
Xylene22,616,713of 14.76

1
Table 2.

Physico-mechanical properties of coatings based on sacrificial primer.
IndicesNo. 1No. 2No. 3the placeholder
Thickness 2-ply    
coverage, mcm656070200
The degree of milling, mcm302530-
Bending of the film, mm112
The strength of the film when struck on    
unit U-1,NSM450480450480
The adhesion score1111
At a temperature of (20±2)°    
The resistance film    
to action of water    
at a temperature of (20×2)°, h80959045

Protective primer containing epoxy resin, a polyamide resin, a powder of zinc, filler, solvent, characterized in that instead of powdered zinc drug use nanostructured particles of zinc concentration (0.4 to 4)·10-3mol/DM3in isooctane and added pigments, in the following ratio, wt.%:

Epoxy resin 9,0-29,0

The polyamide resin of 3.0 to 9.5

Pigment 23,0-36,6

Filler 13,0-23,2

The drug nanoparticles qi is ka 3,0-5,0

The solvent else



 

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