Composition and system for anticorrosion coating

FIELD: chemistry.

SUBSTANCE: proposed composition consists of a semi-finished product and a hardener of polyisocyanate biuret No 31. The semi-finished product has the following ratio of components, in wt pts.: 42.0-55.4 epoxy-melamine-polyester lacquer "ЭП-074" with 55.4% content of non-volatile substances, 33.3-40.8 white titanium pigment TiO2 with rutile structure, 1.4-5.8 synthetic aerosil silica A-175 and 4.0-5.2 talcon MM-20 microtalc as filler, 4.7-19.0 P-189 solvent. The hardener is taken in quantity of 8-13.5 wt.pts per 100 wt pts of semi-finished product. The system of anticorrosion coating comprises a top layer, intermediate layer and a bottom layer. The top and intermediate layers of the system are made from the above mentioned composition. The bottom layer of the system is made from epoxide base coating material "ВГ-33", which contains specularite pigment.

EFFECT: invention increases adhesion to steel at low hardening temperature, impact strength and elasticity, increases the service life of the coating system.

2 cl, 5 tbl, dwg

 

The invention relates to the field of corrosion protection of basic construction materials /steel/ and can be used as protective coatings for marine vessels and floating platforms in the conditions of saline /marine/ water.

Famous nail Polish brand EP-730 /GOST 20824-81/having a chemical composition /parts/epoxy Dianova type e-41 0,3-0,35; a mixture of organic solvents acetone, xylene, ethylcellosolve/taken in the ratio 4:3:3, or solvent P-5 0,7-0,65; hardener No. 1 /solution hexamethylene in ethanol/ 0,03.

Varnish is designed to protect aluminum, steel and nemetallicheskih surfaces, working in conditions of high humidity, the action of a solution of alkali, spirtobenzinovoy mixture.

The disadvantages of this varnish are not reliable adhesion to the substrate, the whitening of the coating, indicating the beginning of the destructive processes in coatings. This significantly increases water absorption, paropronitsaemost and reduced resistance.

Known composition for anti-corrosion coatings, including epoxy resin, solvent and pigments, which are used aluminum or zinc powder /V. Protasov. Efficacy of anti-corrosive coatings for oilfield equipment. M: VNIIEM. - 1984. - P.44-5.

The disadvantage of this structure is the limited resistance of coatings to certain types of corrosion /abrasion, pitting, cavitation/. Another disadvantage is the emission in reactions with aggressive acidic and alkaline environments, loosening the coating structure and dramatically impair its protective properties.

Closest to the invention to the technical essence is a composition for anti-corrosion coatings, consisting of 8 to 14 parts by weight of hardener and 85-91,5 parts by weight of the semifinished product. As the hardener used fluorine-containing oligomer OF 2 in the form of a 50%aqueous solution. As semi-finished products used epoxy lacquer EP-076, containing a solution of epoxy resin. This source also described the system for anticorrosive coatings containing upper layer and a lower layer formed of the above composition /EN 2067105 C1, 27.09.1996/.

The disadvantage of this composition and the system is small, the service life of the coating when exposed to saline sea water and increased toxicity.

Also known is a system for anti-corrosion coatings, including upper, intermediate and lower layers made of epoxy paint and varnish materials /Finkelstein M.I. Industrial application of epoxy paints and varnishes. - L.: Chemistry, 1983. - p.75-78/.

The disadvantage of this system is s is a low life /2-3 years/, due to low adhesion of the coating to the surface and a small thickness of the layers.

The objective of this invention is to provide compositions and systems for anticorrosion coating of marine vessels that run reliably under conditions of saline /marine/ water, and increase the service life of coating systems.

The technical result of the claimed invention is the improvement of the main technical characteristics of the coating and increase the life of the anticorrosion coating systems under conditions of saline /marine/ water.

The technical result is achieved by the fact that the proposed composition for anti-corrosion coating according to claim 1 and a system for anticorrosive coating according to claim 2 differs from the known fact that as a semi composition contains epoxy-melamine-polyester lacquer EP-074 with the content of nonvolatile substances, of which 55.4%, as a hardener - polyisocyanurate No. 31, in addition to the semi-finished product contains pigment titanium oxide TiO2rutelinae patterns, fillers, synthetic silica - A-175 and the micro-talc talkon MM-20 and the solvent R-189; in the system, including upper layer, intermediate layer and bottom layer, top layer and the intermediate layer made from the composition according to claim 1, and the bottom layer is made of epoxy material, paint - primer In the -33, containing pigment specularite.

The invention consists in that the use of modified components /titanium oxide TiO2rutelinae patterns, synthetic silica is Aerosil A-175, a micro-talc, talkon MM-20/ epoxy-melamine-polyester paint EP-074 together with the hardener polyisocyanurate No. 31 in the proposed quantities provides the possibility of "cold" drying of the coating at high protective properties of the compositions and coatings exposed to sea water and UV radiation of the solar spectrum. Ensure compatibility of the proposed composition with an epoxy-kremniiorganicheskie based coating primer VG-33 multi-layer corrosion protection systems for marine vessels.

EP-074 /TU 6-10-1030-76/ epoxy-melamine-polyester lacquer. The specified lacquer applied without hardener and only with hot drying at a temperature of 150-170°C. the Presence of varnish hydroxyl groups provides interaction, and therefore its cure by polyisocyanurate No. 31.

Lac EP-074 /TU 6-10-1030-76/ is a solution of epoxy resin e-49, melamine-formaldehyde resin To 421-04 and polyester LC in organic solvents. Adhesion of the film of not more than 2 points. Drying time to degree 3 at the temperature /150±5/°C not more than 1 hours

Titanium white TiO2rutelinae article shall ectory /GOST 9808-84/. Main features: synthetic achromatic, corrosion-neutral white pigment. A particle size of about 0.3 microns. The reflection in the visible part of the spectrum is not less than 95%. Ensures the stability of the composition when exposed to the ultraviolet radiation of the solar spectrum.

Synthetic silica is Aerosil A-175 /GOST 14922-77/ represents almost pure SiO2/of 99.4-99.8 per cent/. Has thixotropic properties. Characterized by an exceptionally high degree of dispersion, particle size of from 0.15 to 0.02 μm. When the dispersion in the environment moistened only part of their surface, they form the bulk of coagulation grid. These grids include pigment particles and prevent their deposition, increase the viscosity of the disperse medium. Aerosil A-175 - loose bluish-white powder. Mass fraction of the main substances SiO299.8%. Mass fraction of moisture not more than 2%.

The micro-talc - talkon MM-20 /TU 5727-001-49439345-2002/. Is a natural mineral with a particle size of from 6 to 20 μm. The bulk density of 0.2-0.4 g/cm3. To optimise the structure of the formed film coatings.

The hardener is polyisocyanurate No. 31 /TU 6-2 7-217-2001/. Represents an aliphatic isocyanate. Provides weather resistance of the coating based on epoxy-melomano-polyester varnish.

Solvent P-189 is a mixture dissolve the oil: methyl ethyl ketone, atilglukuronida, xylene and butyl acetate. The main requirement for these solvents is very low water content /no more than 0.15%/. Otherwise, the excess water will actively interact with isocyanate groups of the hardener, dramatically inhibiting its activity.

Primer VG-33 /TU 2312-004-29727639-97/ pigment specularite /ISO 1248-74/. Primer VG-33 comes packaged as two components of prefabricated primer VG-33, which includes film-forming substance /solution of epoxy resin e-41/ and specularite and hardener ASOT-2 ratio /parts/ 100/17, respectively.

Specifications VG-33. The elasticity of the film bending, mm, not more than 5. The strength of the film when hitting the device, U-1A, j, not more than 5. The adhesion points, no more than 1. Drying time to degree 3 at the temperature /20±2/C, h 6. Mass fraction of non-volatiles in the material of the primer, %, 45-55.

The composition is prepared as follows. Lac EP-074, titanium oxide TiO2and the micro-talc talkon MM-20 in accordance with the recipe is loaded into the mixer, mix thoroughly until a uniform distribution of pigment and filler, and then dispersed by a bead mill with water cooling for 2 hours, checking periodically to see the degree of milling on the "wedge". Upon reaching milling degree 15 μm in beaded magnitouprugaya Aerosil A-175 and is dispersed to the milling degree 15 μm. Then in a ball mill loaded solvent P-189, mix and unload the containers. In the material composition determine the viscosity, degree of milling and the content of non-volatiles.

The degree of milling is made of compositions defined by GOST 6589-72, viscosity - according to GOST 8420-74 on viscosimetry B3-246 with the nozzle diameter of 4 mm, a mass fraction of solids in the compositions defined by GOST 15537-72, the drying time of coatings according to GOST 19007-73.

The protective properties of the coatings are determined on samples of steel ST.3 sandblasted surface. Tests were conducted in the salt fog chamber for STF VIAM 1-595-7-354-2001, as well as by immersing the samples in 3% NaCl solution.

Physico-mechanical properties and durability of coatings to impact and elasticity/ defined by GOST 4765-73 and OST 6-10-411-77 accordingly, the hardness of the coating after drying is determined according to GOST 5233-67.

Adhesion of the coatings is determined according to GOST 15140-78 /method cross-cuts/.

The invention is illustrated in the examples in the tables: table 1 summarizes the formulation prototypes composition based varnish EP-074, table 2 - main characteristics of manufactured formulations of the compositions in table 3 adhesion and physico-mechanical properties of the coating system primer VG-33 + 2 layers offer the compositions in table 4 adhesion and physico-mechanical the properties of the system primer VG-33 + 2 layers proposed composition after thermostate, in table 5 - results of evaluation of the protective properties of coatings based on the proposed composition.

The drawing shows the kinetics of curing of coatings on the basis of the proposed composition, the cured isocyanate hardener No. 31: 1 to 100 parts by weight of the proposed composition of 8.0 parts by weight of hardener No. 31; 2 - on 100 parts by weight of the proposed composition of 11.0 parts by weight of hardener No. 31; 3 - on 100 parts by weight of the proposed composition of 13.5 parts by weight of hardener No. 31.

From the data in table 2 it follows that the mass fraction of solids in the composition increased significantly /60-77,3%/, and the drying time of the coating decreased to 4-5 h/, which positively affects the economic performance of the proposed composition.

For curing the proposed composition at a temperature /20±2/°C, you must enter 8-13,5 parts by weight of hardener of polyisocyanurate No. 31 on 100 parts by weight of the varnish. With the introduction of the curing agent is less than the lesser of the stated amount of the drying time of the coating increases more acceptable, and the introduction of the curing more more a claimed amount are reduced adhesion and durability of the coating.

These results are based on the use of titanium dioxide rutile patterns, synthetic silica is Aerosil A-175, a micro-talc, talkon MM-20 in these quantities.

Aerosil A-175 included in the composition in amounts of 1,4-58 parts by weight, plays the role of structuring additive, providing education in the composition of the coagulation volume grid, contributing to the increase in the thickness of the coating layer, imparts stability during storage. The introduction of this component is less than 1.4 parts by weight of the composition does not provide the desired thickness of the layer, with the introduction of its more of 5.8 parts by weight of the viscosity of the composition exceeds the desired value.

The micro-talc included in the composition in the amount of 4,0-5,2 parts, affects the drying time and durability of the coating. With the introduction of micro-talc less than 4.0 parts by weight of the drying time increases more acceptable, and the introduction of micro-talc over 5.2 parts by weight of the strength of the coating is reduced.

Developed formulation composition was investigated as a protective coating to protect the hulls of ships in the system with corrosion-resistant ground cover VG-33. System properties of the coatings were determined on samples of steel Art. 3 sandblasted surface. The coating composition was applied in two layers on the primer VG-33 was utverjdali at a temperature of 20±2°C for 5 days. From the results shown in table 3, it is seen that the coating system, consisting of 1 layer of primer VG-33 and two layers of the proposed composition, has high adhesion to steel Art. 3 and physico-mechanical characteristics.

Results polucen the e when determining the adhesion and mechanical properties of the coating compositions on the basis of the proposed composition after thermostate, summarized in table 4. As can be seen from the obtained results, the artificial aging of the coating system based on the proposed composition does not reduce its adhesive properties and strength to the blow, but leads to a slight decrease in the elasticity of the coating. This decrease in elasticity associated with the additional processes of structure formation, which occur at elevated temperatures. However, even after artificial aging, the elasticity remains at a high level.

From the data presented in table 5, it follows that the coatings based on the proposed composition and primer VG-33 have high protective properties in conditions of salt fog and immersion in 3% NaCl solution.

Thus, the supply of compositions based on epoxy-melamine-polyester paint EP-074 advanced titanium white rutile patterns, the input of synthetic silica is Aerosil a-175 and the micro-talc talkon MM-20 and application of the hardener of polyisocyanurate No. 31 significantly extend the operational capabilities of the composition and apply it to effective protection of the hulls of marine vessels in the system of anti-corrosion coatings. The expected life of the coating over 10 years.

Table 1
Recipe prototypes composition based varnish EP-074
ComponentsThe content of components, parts by weight
12345678
Lac EP-074 (mA. non-volatile 55,4%)56,255,448,851,149,643,942,040,0
Titanium whiteto 33.833,339,040,839,635,033,024,0
The micro-talc5,25,2a 4.95,15,04,54,03,0
Aerosil-175-1,4-3,05,84,52,02,0
Solvent P-1894,8the 4.77,3--11,519,021,0

In table 1 examples 7 and 8 are comparative

Table 2
The main characteristics of manufactured formulations of songs
Performance propertiesThe recipe made songs
12345678
Viscosity by viscometer B3-4107,1106,5 70,3108,0115,260,047,045,0
The degree of milling, mcm2020202015152020
Mass fraction of non-volatiles, %70.370,671,077,375,167,060,055,0
Drying time to degree 3, h66554455

Surface preparation
Table 3
Adhesion and mechanical properties of the coating system primer VG-33+2 layers proposed composition
Thickness, micronsThe adhesion pointsPhysico-mechanical properties
SourceAfter 1 day of..After 7 days..Impact strength, jElasticity, mm
Sandblasting80-1001115,06,5
Cleaning glass cloth70-90111-25,06,6

Table 4
Adhesion and mechanical properties of the coating system Primer VG-33 + 2 layers proposed composition
Surface preparationThickness, micronsAfter the flask is e (-60...+80)°C for 10 cycles
Adhesion according to GOST 15140-78Physico-mechanical properties
SourceAfter 1 day of hydrationAfter 7 days of hydrationImpact strength, jElasticity, mm
Sandblasting85-951115,0of 5.4
Cleaning glass cloth75-801115,05,5

Table 5
The results determine the protective properties of coatings based on the proposed composition
The coating systemSurface preparationThe condition of the samples after exposure
Ka is EPA saline mist Immersion in 3% aq NaCl
1 month3 months1 month3 months
Primer VG-33 + offer trackSandblastingFloor unchangedFloor unchangedThe coverage unchangedFloor unchanged
Cleaning glass clothFloor unchangedFloor unchangedFloor unchangedFloor unchanged

1. Composition for anti-corrosion coatings, consisting of a semi-product containing epoxy-melamine-polyester lacquer EP-074 with the content of nonvolatile substances, of which 55.4%, the pigment is titanium oxide TiO2rutelinae patterns, fillers and synthetic silica is Aerosil A-175 and the micro-talc talkon MM-20, solvent R-189, and hardener of polyisocyanurate No. 31 in the following ratio of components in the material, parts by weight:

epoxy-melamine-polyester lacquer EP-074
with the content of nonvolatile substances, of which 55.4%42,0-55,4
the above titanium oxide33,3 of 40.8
the above Aerosil A-1751.4 to 5.8
the above micro-talc4,0-5,2
solvent P-1894,7-19,0,

and the above curing agent take in quantity 8-13,5 parts by weight per 100 parts by weight of the above semi-finished product.

2. System for anti-corrosion coatings, including upper layer, intermediate layer and bottom layer, wherein the top layer and the intermediate layer made from the composition according to claim 1, and the bottom layer is made of epoxy material, paint - primer VG-33 containing pigment specularite.



 

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22 cl, 1 tbl, 2 dwg, 2 ex

FIELD: chemistry.

SUBSTANCE: invention relates to paint-and-varnish industry, in particular to method for production of alkyd-urethane enamels of various colours, and may be used to produce protective-decorating enamel coatings applied onto various substrates. Method for production of alkyd-urethane enamel is described. This method implies preparation of individual precursor components, their dosing, preparation of intermediate enamel product by combining alkyd pentaphthalic lacquer with dispersing medium, organic solvent and rheological agent, the mixture being stirred at 300-500 rpm, followed by introduction of free-flowing pigments into the mixture, together with filler, when required. Pigments and filler are pre-dispersed under stirring at a speed up to 1000 rpm until homogenous suspension is obtained. Then intermediate product is further dispersed until required degree of grinding is obtained, alkyd-urethane lacquer is added under stirring and, when required, anti-crater additive and paint dryer are added. Then, pigment tinting paste is added, the mixture is stirred to obtain homogenous suspension, and antiskinning agent is added.

EFFECT: production of alkyd-urethane enamels of various colours, with high physical and chemical properties.

10 cl, 5 tbl

Pigmental paste // 2328512

FIELD: chemistry.

SUBSTANCE: invention relates to the pigmental paste for paint toning. The pigmental paste for toning the covering composition is described, where the pigmental paste includes: at least one ramified alkide with the viscosity less than 5 Pa·s at 23°C and shift rate 100 c-1 and the number-average molecular weight Mn>1500, which contains the groups for the oxidising drying produced from the fatty acids; one or several solvents without aromatic substances - 28 mass percent; and one or several pigments. At that, the rate of alkide ramification is at least 0/35 and preferably less than 0.42, alkide fatness is at least 76 and preferably less than 84, the alkide acidity index is within 6 to 9 mg KOH/g; the solvent without the aromatic substances contains the aliphatic hydrocarbon solvents, ketones and/or complex ethers with molecular weight Mn>1500. The method for paint toning is described where the principal paint is selected from the set of principal paints and then mixed with the said pigmental paint, at that, the principal paint corresponds to the composition based on solvent and containing alkide.

EFFECT: invented pigmental paint is useful in toning paint with high concentration of solid substances.

11 cl, 8 dwg

Priming composition // 2322467

FIELD: protecting materials.

SUBSTANCE: invention relates to priming compositions used for anticorrosive covers applied on surface of mainly ferrous metals in machine engineering, and woody and other materials. The priming composition comprises lacquer GF-01, red pigment, siccative, solvent, chalk of sort M-5 and lecithin as a disperser, siccative NF-1 as a siccative, and slime after dry scrubbing in electric steel melting production of the following chemical composition, wt.-%: SiO2, 7.76; phosphorus (P), 0.041; chrome (Cr) total, 1.0; Al2O3, 0.93; TiO2, 0.099; MnO, 2.29; CaO, 21.3; MgO, 24.5; FeO, 3.91; Fe2O3, 32.02; CaF2, 5.26; CaO (incompletely burned material), 0.89 in the following granulometric composition of slime, %: below 20 mcm, 15; from 20 to 25 mcm, 60, and from 25 to 100 mcm, 25. Invention provides decreasing cost and enhancing exploitation parameters of the priming in coating the broad spectrum of surfaces in machine engineering and building.

EFFECT: improved and valuable properties of priming composition.

5 tbl

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: paint and varnish materials.

SUBSTANCE: invention relates to coloring pastes designated for using in ready basic pant and varnish materials that are soluble in organic solvents. Universal pigment coloring paste comprises pigment, film-forming agent, disperser, thickening agent and organic solvent. Alkyd glyphtal resin based on flax oil, glycerol and phthalic anhydride is used as a filling agent taken in the ratio, wt.-%: 45-47; 17-19 and 34-38, respectively, with viscosity index 60 measured at temperature 20.0 ± 0.5°C by viscosimeter device VZ-246 as 50% resin solution in xylene and having acid number 17-19 mg of KOH/g taken in the amount 30-40 wt.-%. Thickening agent Clayton AF is used a thickening agent taken in the amount 0.3-0.5 wt.-%. Xylene is used as an organic solvent taken in the amount 34-45 wt.-%. Disperser is used in the amount 0.9-2 wt.-%, and pigment, the balance. Invention provides expanding assortment of coloring pigment pastas, their using in different basis of dyes in organic solvents, providing stability of dyes and without unfavorable effect of properties of paint and varnish covers.

EFFECT: improved and valuable properties of paste.

4 tbl

FIELD: chemistry.

SUBSTANCE: anticorrosive coating compound with high content of non-volatile components containing a major component (A) containing epoxy resin (a1) and polymerised monomer (a3) (meth)acrylate, and curing component (B) containing alicyclic amine hardener (b1) and/or Mannich base-type hardener (b2); component (A) and/or component (B) contains at least either an additive (a2) chosen from epoxidated reactive diluents and modified epoxy resins, and a modifier (ab) of coating film chosen from petroleum polymer resins, xylene resins, coumarone resins, terpene-phenolic resins and vinyl chloride copolymers. Anticorrosive coating compound with high content of non-volatile components, particularly quick-set compound is characterised by content of organic solvents with boiling temperature 150°C and higher. Essentially it does not contain organic solvents with boiling temperature 150°C or lower.

EFFECT: compound is used to coat all time of the year regardless of temperatures due to quick drying and sufficient viability and has good low-temperature curability.

59 cl, 9 tbl

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