Anti-corrosion pigment

IPC classes for russian patent Anti-corrosion pigment (RU 2330054):

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The method of obtaining n-substituted ethyl-(2-dialkoxybenzene - cyano)-butanamide / 2236414

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Method for production of phosphorous and chlorine containing methacrylates / 2251550

FIELD: chemistry.

SUBSTANCE: invention relates to protection of metals from corrosion using lacquer coating. This engineering problem can be solved by using calcium hydroxyethylidenediphosphonate with formula CH₃(OH)C(PO₃)₂Ca₂ as an anti-corrosion pigment, with higher anti-corrosion activity as compared to the prototype - protonated zinc hydroxyethylidenediphosphonate and a control specimen - zinc tetraoxychromate.

EFFECT: low-toxic high performance anti-corrosion pigment.

1 tbl, 3 ex

The invention relates to the field of protecting metals from corrosion paints.

The ability of coatings to protect metals from corrosion is largely determined anticorrosion efficiency included in the composition of the coatings pigments.

The most effective anti-corrosion pigments are finely dispersed substances containing chromium in higher oxidation States, see the book Ermilov P.I., Indacin E.A., Tolmachev I.A. Pigments and pigmetirovannye coating materials. - L.: Chemistry, 1987. - 200 C. However, the toxicity of the compounds of Cr (VI) makes the inevitable exception of pigments of this type of composition of the paint composition in the near future.

As an alternative to chromium(VI)-containing pigments are often phosphates of zinc and other metals. As phosphate-containing pigments are mainly used phosphates of zinc (Zn₃(PO₄)·nH₂O and chromium Cr(PO₄)·nH₂Oh, which are non-toxic crystalline, see the book Korsunsky L. F., Kalin T.V., S. Stepin. Inorganic pigments. Ref, ed. - SPb.: Chemistry, 1992. - 336 S. Phosphate chromium is used in pigment compositions in combination with chromate pigments.

At the present time to protect metals from corrosion is known the use of condensed phosphates of metals - diphosphate m the di Cu ₂P₂O₇, calcium CA₂P₂O₇magnesium Mn₂P₂O₇; polyphosphates of the calcium CA₃(R₃About₁₀)₂·1,5H₂O, zinc Zn₃(R₃About₁₀)₂·N₂O, aluminum Al₃(R₃About₁₀)₂·2H₂O; collateralisation iron Fe₂P₄O₁₂, copper Cu₂P₄O₁₂, Nickel Ni₂P₄O₁₂, zinc Zn₂P₄O₁₂magnesium Mg₂P₄O₁₂, calcium Ca₂P₄O₁₂and manganese Mn₂P₄O₁₂see author's certificate Czechoslovakia: 262501, 256138, 259337, 247844, 253098, 259926, 245071, 259906, 260487, 259341; Zotov E.V., Luganceva L.N., Petrov LN. The protective properties of a number of passivating pigments // Paint-and-lacquer materials and their application. - 1987. No. 5. - P.27-29.

The General lack of phosphate pigments used in paint and varnish materials, anti-corrosion purposes, is the low efficiency in the initial stages of the development sub pellicle corrosion process, see Wienand H., Ostertag W. Anorganische Korrosionsschutzpigmente-Uberblick und neuere Entwicklung // Farbe und Lack. - 1982. Bd.88. No. 3. - S.183-188. Therefore, as studies show, anticorrosion efficiency of phosphate pigments in many cases inferior chromate, see F. de L.Fragata, J.E.Dopico Anticorrosive behaviour of zinc phosphate in alkyd and epoxy binders. J. Oil and Colour Chem. Assoc. 1991. 74, N3, pp.92-97.

The closest is the structure of the present invention is protonated phosphonate zinc formula

CH₃(HE) (RHO₃H₂)(RHO₃)Zn,

used as inhibitory and complexing additives to aqueous primers to rust converters, see the book Austinburg, IF ICCO, Tvilisskaya anti-Corrosion primer, SPb.: LLC NEPHRONS LMB and P OP", 2006. - s.

The disadvantages of this phosphonate zinc from the point of view of its possible use as an anticorrosive pigment is low anticorrosive efficiency and solubility in water, which leads to deterioration of the insulating properties of anticorrosive coatings.

Object of the invention is the finding of low high-performance anti-corrosion pigment.

The technical problem is solved by use hydroxyethylidenediphosphonic calcium formula

CH₃(HE) (RHO₃)₂CA₂

as anticorrosive pigment.

Technical solution allows to apply hydroxyethylidenediphosphonic calcium formula

CH₃(HE) (RHO₃)₂CA₂

as a highly effective anti-corrosion pigment.

Hydroxyethylidenediphosphonic calcium is obtained by precipitation from the aqueous environment when interacting hydroxyethylidenediphosphonic acid and ions of CA²⁺resulting from the dissociation of water-soluble calcium salts, when mol is th ratio of the acid salt of calcium, equal to 1:2, see kN. Nmetau, Viatamin, Keepopen. Chelating agents and metal complexons. M.: Chemistry, 1988, s. As water-soluble salts of calcium use nitrate or chloride. The resulting product is not used or is a white, fine powder, insoluble in water.

For evidence of corrosion properties hydroxyethylidenediphosphonic calcium explore pestiviruses the effect of aqueous extracts on steel. As a control sample using the chrome-containing tetrachromat zinc (GOST 16763-79)related to the most widely used in practice, the anti-corrosion pigments.

Surface preparation of samples of body steel 08KP before corrosion tests carried out by blasting and subsequent degreasing mineral spirits and acetone.

Aqueous extract hydroxyethylidenediphosphonic calcium and tetrachromate zinc prepared in accordance with the methodology described in the book Iagellonicae, Day, Iautomate. Laboratory pigments and pigmented paints, varnishes and lacquers, L.: Chemistry, 1990, s.

In chemical beaker with a capacity of 150-300 ml was placed 15 g of the pigment, poured cylinder 50 ml of distilled water, heated to boiling and boiled for 30 minutes, the Suspension is cooled, the filtrate is poured into the cylinder and bring the volume to 50 ml with distilled water, then mixed with an equal volume of a 6%aqueous solution of sodium chloride. The resulting aqueous extract is used for testing the next day after cooking.

For the evaluation of corrosion properties of protonated hydroxyethylidenediphosphonic zinc formula CH₃(HE) (RHO₃H₂)(RHO₃)Zn him to prepare an aqueous solution with a concentration equal to the content of water-soluble substances in the aqueous extract hydroxyethylidenediphosphonic calcium formula CH₃(HE) (RHO₃)₂CA₂.

Aqueous extract of pigments and a solution of protonated hydroxyethylidenediphosphonic zinc is brought into contact with steel 08KP and can stand up to the establishment of a constant value of the electrochemical potential of the steel. If the steady-state electrochemical potential of the steel ranges of values that is appropriate to its passive state, in aqueous extract or solution of the inhibitor continuously dispense a 5%aqueous solution of sodium chloride. In the dispensing process control the electrochemical potential of the steel. When a certain (critical) concentration of sodium chloride there is a sharp decrease of the electrochemical potential of the steel in the area of active dissolution. This concentration value is a criterion anticorrosion efficiency of water of the studied pigments and inhibit the and. The increase of this parameter corresponds to strengthen their pestiviruses actions, see Stepin S.N., Wahin AV, Pelts AV, Ziganshina MR research Method of anticorrosive properties of pigments and pigmented coatings // Paint-and-lacquer materials and their application. - 2000. No. 1. - S-27.

The results of the experiments are given in the table.

Table 1.
Anti-corrosion properties hydroxyethylidenediphosphonic calcium in comparison with the prototype and chromium pigment (tetrachromats zinc)
No. p.p	The research object	C^K _NaClmmol/l
1	2	3
1	Hydroxyethylidenediphosphonic calcium formula CH₃(HE) (RHO₃)₂CA₂(in accordance with the invention)	416
2	Protonated hydroxyethylidenediphosphonic zinc formula CH₃(HE) (RHO₃H₂)(RHO₃)Zn (prototype)	233
3	Tetrachromat zinc (control sample)	312

The tests showed that hydroxyethylidenediphosphonic calcium anticorrosion properties etc which dates back to the prototype and toxic tetrachromat zinc, that confirms the possibility of its use as a highly effective anti-corrosion pigment.

Application hydroxyethylidenediphosphonic calcium formula CH₃(HE) (RHO₃)₂CA₂as anticorrosive pigment.