Anti-corrosion pigment

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.pThe research objectCKNaClmmol/l
123
1Hydroxyethylidenediphosphonic calcium formula CH3(HE) (RHO3)2CA2(in accordance with the invention)416
2Protonated hydroxyethylidenediphosphonic zinc formula CH3(HE) (RHO3H2)(RHO3)Zn (prototype)233
3Tetrachromat 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.



 

Same patents:

FIELD: chemistry.

SUBSTANCE: invention concerns antirust modificating coating obtained from composition of (mass %): orthophosphoric acid -25.0-40.0; graphite "ГЭ-3" - 12.0-30.0; acryl dispersion Diakam-11 -30.0-50.0; auxiliary substance "ОП-10" - 0.25-2.5; industrial flaxseed oil - 2.0-10.0; concrepol "B" based on water solution of poly-N-vinylpyrrolidone - 0.2-2.0.

EFFECT: application at temperature below zero possible; faster drying; wide range of storage temperature; longer storage without exfoliation and wider range of maintenance temperatures for a building covered with this coating.

1 tbl

FIELD: inorganic chemistry.

SUBSTANCE: invention refers to anticorrosive coatings of cold drying and can be applied for corrosion prevention of steel, zinc-coated steel, cast-iron and aluminium surfaces. Described anticorrosive paint-and-lacquer composition is cured with aliphatic polyisocyanate containing hydroxyl acrylic or polyester resin, pigments, filling agents, organically modified polysiloxane, organic solvent, structure-forming agent, thermoplastic acrylic copolymer, dispersant at specified components ratio. Technical result is coating based on specified composition having high protective properties as tested in mineral oil, petrol and water.

EFFECT: production of anticorrosive coating with high protective properties.

2 tbl, 3 ex

FIELD: inorganic chemistry.

SUBSTANCE: anticorrosive composition is applied for corrosive prevention of reinforced concrete and metal surfaces of structures and equipment in high humidity and sulphur dioxide, hydrogen sulphide, chlorine, ammonia. Anticorrosive composition contains industrial lignosulphonates, tall pitch, colophony, pigment-aluminium powder PAP-1, reducing agent - titanium dioxide, zinc phosphate, zinc oxide, hardener - polyethylenepolyamine, modifying agent - hexamethylenetetramine, providing high water resistance. To provide rheological properties composition contains acryloyltrimethylamidopropylammonium chloride in amount 0.02 weight fractions 0.02. Technical result is improved light resistance, reduced dryout period and widen range of colours of protective coating.

EFFECT: production of anticorrosive coating with improved protective properties.

3 cl, 2 tbl

FIELD: antifriction materials.

SUBSTANCE: invention relates to antifriction compositions based on soluble fluoropolymers that can be used to coat surfaces of piston rings, sealing rings, ring gaskets, collars, and other antifriction rubber parts used in friction units of machines in instrument engineering, chemical machinery construction, automobile industry, and aircraft industry. Antifriction composition described in invention comprises soluble tetrafluoroethylene/vinylidene fluoride copolymer, organic solvents: acetone, ethylacetate, cyclohexanone, and amyl acetate, low-molecular weight epoxy dian resin ED-8 or ED-10, amine hardener (product of condensation of formaldehyde and phenol with ethylenediamine AF-2), diluent (ethyl cellosolve), and, additionally, filler: graphite or molybdenum disulfide.

EFFECT: increased wear resistance and durability of rubber sealing members.

2 cl, 3 tbl, 5 ex

FIELD: polymeric materials.

SUBSTANCE: invention relates to polymeric protective materials and can be used for creature of anticorrosive covers. Photohardening composition for cover comprises the following components, mas. p. p.: polysulfide oligomer, 5-10, unsaturated polyester resin, 100-105, and a photoinitiating agent, 3-6. Resin of sort PN-9119 is used as unsaturated polyester resin that represents products of polycondensation of propylene glycol with dimethylterephthalate and maleic anhydride dissolved in styrene (the styrene concentration is 35-45%). Proposed composition provides the high hardening rate to obtain materials showing the high cross-linking frequency and regularity of structure that enhance bending and stretching strength, resistance against corrosion and adhesion properties of the cover.

EFFECT: improved and valuable properties of composition.

2 tbl, 10 ex

FIELD: protective materials.

SUBSTANCE: invention relates to paint and varnish materials applied on surface for anti-corrosive protection of metallic construction and exhibiting large exploitation period. Paint and varnish materials comprise conducting polyethylene as a film-forming substance. Invention provides enhancing effectiveness of anti-corrosive protection of metallic constructions for prolonged exploitation period and enhancing working life of anti-corrosion cover for metallic constructions based on creature the uniform electric potential on a cover surface equal to the potential value of metallic construction to be protected and realization the additional protection effect.

EFFECT: improved and valuable properties of material.

1 tbl

FIELD: cathodic protection of metalwork.

SUBSTANCE: proposed paint-and-varnish material for corrosion protection of metalwork includes electrically conducting film-forming agent (electrically conducting polyethylene) and carbon nanotubes, from 10 to 80% of volume of paint-and-varnish material which increase electric conductivity and resistance to aggressive media and consequently mechanical strength of metalwork. Proposed paint-and-varnish material may additionally contain high-dispersed zinc powder ensuring additional cathodic protection from 40 to 90% of volume of paint-and-varnish material.

EFFECT: enhanced efficiency of corrosion protection of metalwork during protracted period of operation due to smooth electrical potential equal to potential of metalwork being protected.

5 cl, 1 tbl

FIELD: corrosion protection.

SUBSTANCE: invention describes using fine amorphous silica as collector for substances forming coating protecting a structural material against corrosion.

EFFECT: reduced consumption of expensive reagents in a protective pigment preparation process, reduced toxicity of materials based thereon, simplified pigment preparation technology, and increased adhesion of resulting materials for a structure surface.

7 dwg

FIELD: protective decorative and anti-adhesive coats applied on metal, plastic, concrete and other surfaces.

SUBSTANCE: proposed composition contains copolymer trifluorochloroethylene with alkyl vinyl esters with reaction groups, organic solvent, hardening agent and catalyst; besides that composition contains perfluorinated organic compound introduced in it in the amount of 0.1-1% of copolymer mass; used as organic perfluorinated compound is perfluoroperalgon acid, perfluorooenantic acid, alcohol-telomer and pigment introduced additionally.

EFFECT: enhanced bioresistance; improved hydrophobic property and radioparency.

5 cl, 2 tbl

FIELD: corrosion protection.

SUBSTANCE: corrosion-inhibiting mixture contains (A1) corrosion-inhibiting pigments, (A2) amorphous silica modified with metal ions and (A3) at least one compound of general formula I: RO-M[-O-P(O)(OH)-O-P(O)(OR1)2]3·HP(O)(OR2)2, where variable parameters and indexes have following meanings: M is central atom selected from group of Lewis acceptors, R and R1 are, independently from each other, aliphatic and R2 cycloaliphatic residues. Disclosed are also materials containing this corrosion-inhibiting mixture and use thereof as lacquer coatings for rolls.

EFFECT: increased mechanical strength and improved anticorrosion properties.

24 cl, 1 tbl

FIELD: chemistry.

SUBSTANCE: invention concerns process of production of diisopropyl {[1-(hydroxymethyl)-cyclopropyl]oxy}methylphosphonate represented by the formula , which is the key intermediate compound in synthesis of antiviral nucleoside analogue. The invention also concerns new intermediate compounds of formulae and , and their production of compound (2) obtained under this invention, which is an antiviral nucleoside analogue (especially against hepatitis B virus) represented by the formula .

EFFECT: high purity grade and high output.

4 ex

FIELD: organic chemistry, medicine, biochemistry.

SUBSTANCE: invention describes compound of the formula (I): wherein R1 means hydrogen atom (H); R2 means -SH, -S-C(O)-R8, -P(O)(OR5)2, -P(O)(OR5)R6, -P(O)(OR5)-R7-C(O)-R8, -P(O)(OR5)-R7-N(R5)-S(O)2-R9 or -P(O)(OR5)-R7-N(R5)-C(S)-N(R6)2; R3 means tetrazole, -C(O)OR6, -C(O)O-R7-OC(O)R5; R4 means optionally substituted aryl, or R4 means N-heterocyclyl. Also, invention describes compounds of the formula (II): and (III): wherein X means -CH2- or -O-, and pharmaceutical compositions comprising indicated compounds. Proposed compounds possess inhibitory effect on activity of plasma carboxypeptidase B and used as anti-thrombosis agents.

EFFECT: valuable medicinal and biochemical properties of compounds.

34 cl, 19 ex

FIELD: organic chemistry, biochemistry, medicine.

SUBSTANCE: invention relates to phosphonic acid compounds used as inhibitors of serine proteinase of the general formula (I): wherein R1 is chosen from group comprising piperidinyl, pyrrolidinyl and 1,3,8-triazaspiro[4,5]dec-8-yl (wherein heterocyclic ring as added to nitrogen atom in ring) and -N(R7R80 wherein this heterocyclic ring is substituted optionally with one or two substitutes chosen independently from group comprising the following compounds: (a) C1-C8)-alkyl substituted optionally at terminal carbon atom with a substitute chosen from group comprising aryl, heteroaryl; c) phenyl and naphthalenyl; i) benzothiazolyl; R7 is chosen from group comprising hydrogen atom and (C1-C8)-alkyl; R8 is chosen from group comprising: (aa) (C1-C8)-alkyl; (ab) cycloalkyl; (ac) cycloalkenyl, and (ad) heterocyclyl (wherein R8 is added to carbon atom in ring) wherein (ab) cycloalkyl; (ac) cycloalkenyl, and (ad) heterocyclyl (wherein heterocyclyl (ad) comprises at least one cyclic nitrogen atom) substitutes and cycloalkyl moiety (aa) of a substitute is substituted optionally with substitutes chosen independently from group comprising: (ba) (C1-C8)-alkyl substituted at terminal carbon atom with a substitute chosen from group comprising amino-group (with two substitutes chosen independently from group comprising hydrogen atom and (C1-C8)-alkyl); (bb) (C1-C8)-alkoxy-group substituted at terminal carbon atom with a substitute chosen from group comprising carboxyl; (bc) carbonyl substituted with a substitute chosen from group comprising (C1-C8)-alkyl, aryl, aryl-(C2-C8)-alkenyl; (bd) aryl; (be) heteroaryl; (bf) amino-group substituted with two substitutes chosen independently from group comprising hydrogen atom and (C1-C8)-alkyl; (bh) halogen atom; (bi) hydroxy-group; (bk) heterocyclyl wherein (bd) is aryl substitute, and heteroaryl moiety (bc) comprise a substitute (halogen atom)1-3; R4 is chosen from group comprising aryl and heteroaryl wherein heteroaryl comprises halogen atom as a substitute; R2 and R3 are bound with benzene ring and represent hydrogen atom, and R2 and R3 form in common optionally at least one ring condensed with benzene ring forming polycyclic system wherein this polycyclic system is chosen from group comprising (C9-C14)-benzocondensed cycloalkenyl, (C9-C14)-benzocondensed phenyl; R5 is chosen from group comprising hydrogen atom and (C1-C8)-alkyl; R6 is chosen from group comprising (C1-C8)-alkyl and hydroxy-group; Y is absent, and X represents a single substitute that is added by a double bond and represents oxygen atom (O), and Z is chosen from group comprising a bond, hydrogen atom, and its salts. Also, invention relates to a method for synthesis of these compounds, to their composition inhibiting serine proteinase and to a method for its preparing. Proposed invention describes a method for treatment of inflammatory or serine proteinase-mediated disorder.

EFFECT: valuable biochemical and medicinal properties of compounds.

64 cl, 5 tbl, 38 ex

FIELD: chemistry of organophosphorus compounds.

SUBSTANCE: invention relates to the improved method for synthesis phosphorus-chlorine-containing methacrylates that can be used in synthesis of polymeric, among them, uncolored, optically transparent and composition materials with reduced inflammability. Invention describes a method for synthesis of phosphorus-chlorine-containing methacrylates of the general formula:

wherein R means lower alkyl, chloroalkyl, alkoxyl, phenoxyl or group of the formula:

R1 means lower alkoxyl, phenoxyl or group of the formula:

Method involves interaction of phosphoric pentavalent acid chloroanhydrides with methacrylic acid glycidyl ester at heating in the presence of hexamethylenephosphorotriamide or dimethylformamide as a catalyst wherein catalyst is taken in the amount 0.3-0.6% of reagents mass, and process is carried out at rise of temperature from 40°C to 80°C in the presence of compound chosen from the group: alkyl- or alkoxy-substituted phenols taken in the amount 0.03-0.3% of reagents mass. Method provides decreasing water absorption of (co)polymerization products of synthesized phosphorus-chlorine-containing methacrylates and reducing retention time of surface stickiness of fiber glass synthesized on their basis and at retention the level of other properties, among them transparence and colorless.

EFFECT: improved method of synthesis, improved and valuable properties of compounds.

2 tbl, 10 ex

FIELD: organic chemistry, chemical technology, medicine.

SUBSTANCE: invention relates to acyclic nucleoside phosphonate derivatives of the formula (1): wherein means a simple or double bond; R1 means hydrogen atom; R2 and R3 mean hydrogen atom or (C1-C7)-alkyl; R7 and R8 mean hydrogen atom or (C1-C4)-alkyl; R4 and R5 mean hydrogen atom or (C1-C4)-alkyl possibly substituted with one or more halogen atoms, or -(CH2)m-OC(=O)-R6 wherein m means a whole number from 1 to 5; R6 means (C1-C7)-alkyl or 3-6-membered heterocycle comprising 1 or 2 heteroatoms taken among the group consisting of nitrogen (N) and oxygen (O) atoms; Y means -O-, -CH(Z)-, =C(Z)-, -N(Z)- wherein Z means hydrogen atom, hydroxy-group or halogen atom, or (C1-C7)-alkyl; Q (see the claim invention); its pharmaceutically acceptable salts or stereoisomers. Also, invention proposes methods for preparing compounds of the formula (1) and their using in treatment of hepatitis B or preparing a medicinal agent designated for this aim.

EFFECT: improved preparing method, valuable medicinal properties of compounds and agent.

16 cl, 10 tbl, 87 ex

FIELD: organic chemistry, chemical technology.

SUBSTANCE: invention relates to the improved method for preparing N-phosphonomethylglycine. Method involves interaction of derivative of hexahydrotriazine of the formula (II):

wherein X represents CN, COOZ, CH2OY and others; Z and Y represent hydrogen atom and others with triacylphosphite of the formula: P(OCOR3)3 (III) wherein R3 means (C1-C18)-alkyl or aryl that can be substituted. The prepared product is hydrolyzed and (if X represents CH2OY) oxidized. The proposed method is a simple in realization, economy and provides high degree of the end product purity.

EFFECT: improved preparing method.

19 cl, 11 ex

FIELD: chemistry of organophosphorus compounds.

SUBSTANCE: invention relates to compounds with the bond C-P, namely to phosphorus-boron-containing methacrylate that can be used as inhibitor of combustion of polyvinyl alcohol-base film materials. Invention describes phosphorus-boron-containing methacrylate of the following formula: wherein n = 4-8. Polyvinyl alcohol films modified with indicated phosphorus-boron-containing methacrylate shows the enhanced refractoriness, rupture strength up to 206 kgf/cm2, water absorption up to 240% and relative elongation up to 12%.

EFFECT: valuable properties of substance.

1 tbl, 2 ex

FIELD: organic chemistry, in particular improved method for production of phosphorinated and chlorinated methacrylates.

SUBSTANCE: invention relates to method for production of compounds having general formula , wherein R is lower alkyl and R1 is lower alkoxyl, phenoxyl, or group of formula . Claimed method includes reaction of pentavalent phosphorous acid chloroanhydride with glycydil methacrylate at 20-50°C in presence of titanium tetrachloride as catalyst in amount of 0.02-0.05 % calculated as reagent mass.

EFFECT: one-step method for production of phosphorous and chlorine containing methacrylates with improved water resistance.

2 tbl, 7 ex

The invention relates to new biologically active phosphonate derivative of acyclovir

The invention relates to the chemistry of organophosphorus compounds, and in particular to a new method of obtaining N-substituted phosphorylated of imidates having the structure zenatello group

FIELD: organic chemistry, in particular improved method for production of phosphorinated and chlorinated methacrylates.

SUBSTANCE: invention relates to method for production of compounds having general formula , wherein R is lower alkyl and R1 is lower alkoxyl, phenoxyl, or group of formula . Claimed method includes reaction of pentavalent phosphorous acid chloroanhydride with glycydil methacrylate at 20-50°C in presence of titanium tetrachloride as catalyst in amount of 0.02-0.05 % calculated as reagent mass.

EFFECT: one-step method for production of phosphorous and chlorine containing methacrylates with improved water resistance.

2 tbl, 7 ex

Up!