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INVENTION
Patent of the Russian Federation RU2260608
Primer-enamel WATER-DISPERSIVE ANTI-CORROSIVE SERIES "KRONAKRIL"
The name of the inventor: Romanovsky DV (RU); Brykalov A.K.
The name of the patent holder: Romanovsky Dmitry Vyacheslavovich
Address for correspondence: 150051, Yaroslavl, POBox 565, Yu.A. Kuzmin
The effective date of the patent: 2003.08.28
The invention relates to paint and varnish materials, namely to primer water-dispersion compositions intended to protect against corrosion of metal surfaces that are operated both under atmospheric conditions and exposed to various liquids. SUMMARY OF THE INVENTION: An anticorrosive water-dispersion primer enamel comprising, by weight: a binder-styreneacrylic dispersion 30-50, an anticorrosive pigment-calcium molybdate phosphate at a molar ratio of molybdate and phosphate ions from 1: 0.01 to 1: 100 , Color-forming pigment 1-10, phosphate dispersant 0.1-1.0, thickener 0.05-0.2 and other water. The technical result - the use of calcium molybdate phosphate in primer enamels provides passivating activity in the interaction of phosphate-molybdate ions with a metal substrate of both ferrous and non-ferrous metals, has an additional protective effect.
DESCRIPTION OF THE INVENTION
The invention relates to paint and varnish materials, namely to primer water-dispersion compositions intended to protect against corrosion of metal surfaces that are operated both under atmospheric conditions and exposed to various liquids. Can be used as a primary primer, but as an independent paint and varnish coating.
It is known to use as a water-dispersion primer a composition comprising a butadiene-styrene carboxylate latex, a surfactant, orthophosphoric acid, hydroxyethyl cellulose, sodium polyphosphate and water. [Authors' Certificate of the USSR No. 1004432, MCI C 09 D 5/02, 1980].
The disadvantage of this composition is the low film strength and low anticorrosive properties of the coating.
The closest to the claimed invention and accepted as a prototype is an aqueous dispersion primer comprising a latex of a styrene-butadiene copolymer, orthophosphoric acid, a zinc iron phosphate pigment, a surfactant, a red iron oxide pigment, hydroxyethyl cellulose, sodium polyphosphate and water [Russian Patent No. 2063409, IPC 6 C 09 D 109/08, publ. 10.07.96].
This primer has an increased (in comparison with No. 1004432) mechanical strength and slightly increased corrosion resistance when exposed to water due to the additional introduction of zinc iron phosphate pigment into the orthophosphoric acid composition.
However, a primer of such a composition has a low resistance to mineral oil, alkali, a solution of NaCl, gasoline and other solvents.
The object of the present invention is to provide a water-dispersed primer-enamel with increased resistance to static action of the above liquids, which makes it possible to effectively use it in the chemical, engineering and automotive industries.
The essence of the invention consists in using as an anticorrosive pigment instead of orthophosphoric acid and zinc iron phosphate pigment, calcium molybdate phosphate, wherein the molar ratio of molybdate and phosphate ions in it can be from 1: 0.01 to 1: 100.
The technical result of the use of calcium molybdate phosphate in an aqueous dispersion primer enamel is the formation of a phosphomolybdate film on the substrate under the influence of a corrosive medium that causes a passivation of the metal surface and, thus, has an additional protective effect.
Thus, the use of calcium molybdate phosphate in primer enamels provides high passivating activity in the interaction of phosphate-molybdate ions with a metal substrate of both ferrous and non-ferrous metals, providing cathodic and anodic protection.
Primer-enamel, both prototype and claimed, consists mainly of a binder, an anticorrosive pigment, a color-forming pigment, a dispersant and a thickener, the rest is water that is used as a solvent.
In the prior art, a latex of the butadiene styrene copolymer is used as a binder, in this invention, it is proposed to use a styrene acrylic dispersion as such, which increases the hardness and elasticity of the coating. Qualitative features of styreneacrylic dispersion are indicated in Table. 1. Its quantitative content in the primer-enamel composition is 30-50%, which is established as a result of the research. This feature is distinctive from the prototype.
In the prototype, orthophosphoric acid and zinc iron phosphate pigment are used as an anticorrosive pigment, in the present invention calcium phosphate is used, as was proved above, with a content of 0.1-20% in the enamel primer, depending on the metal that is coated with this primer-enamel .
In the prototype, pigment red iron oxide, which stains the ground surface in a red-brown color, is used as a color. However, other color-forming pigments can also be used in such primer enamels, for example: yellow iron oxide pigment, blue phthalocyanine pigment, chromium oxide, aluminum powder, etc., which, without changing the chemical effect on the metal covered with the primer enamel, only change the color of the coating . Since the color of the primer-enamel can be different, it is advisable to apply a general term for all tinting pigments - a color-forming pigment. Its (pigment) content in the primer enamel is almost the same as in the prototype - 1-10%.
In the prototype, sodium polyphosphate is used as a dispersant, but potassium polyphosphate, sodium or potassium pyrophosphate, sodium or potassium tripolyphosphate can be used in the same quality. In the present invention, sodium polyphosphate or other substances mentioned above perform the same function as the dispersant, however, the limits of their application (based on the results of R & D) can vary from 0.1 to 1.0% in the primer-enamel composition. This feature is defined as a "phosphate dispersant".
In the prototype, hydroxyethylcellulose, which belongs to the group of cellulose esters, was used as the thickener. This group includes: carboxymethyl cellulose, cellulose diacetate, cellulose acetate propionate, tylos, and mucilose, but acrylic and methacrylic acid polymers or polyurethanes (polyhydroxy esters sewn with isocyanate groups) can be used which are similar in their primer enamel composition, Therefore, for these substances, the general term "thickener" is applicable, especially since its content in the enamel primer for all substances in this group - 0.05-0.2% gives the effect achieved.
The rest in the proposed primer enamel is water, as a solvent.
An example of the implementation of this invention is the method for obtaining a primer-enamel made by the applicant.
In a container with a stirrer, water, a thickener, a phosphate dispersant, calcium molybdate phosphate are added in the form of a compounded amount, while stirring for 25-30 minutes. Then the mixture is fed into a bead mill and dispersed until it reaches a degree of grinding with a "wedge" device of not more than 30 microns. The grinded mixture is fed to a mixer and a prescription amount of styrene acrylic dispersion is then added. After stirring for 20-30 minutes, a color-forming pigment is added to obtain the desired shade. Next, the primer enamel is checked for quality.
To compare the resistance to the static action of corrosive liquids, the primer-enamel formulations according to the invention and the primer composition according to the prior art were prepared. When determining the film's resistance to the static action of aggressive liquids, the primer enamel was applied to steel plates of 08 KP, previously cleaned of rust and defatted with acetone. The resulting coating was cured at 20 ± 2 ° C for 5 days, then tested.
The test data are summarized in Table. 2, wherein the compositions of the enamel primer with various ratios of calcium molybdate phosphate, styrene acrylic dispersion, color-forming pigment, dispersant, thickener and water, and claim 19, are a primer prepared in accordance with the most corrosion-resistant primer- Prototype.
| Table 1 | ||
| № п / п | Quality Score | Norm |
| 1 | Mass fraction of non-volatile substances,%, not less than (mdn) | 40 |
| 2 | PH, not less than | 7.0 |
| 3 | Mass fraction of residual monomer,%, not more than | 0.05 |
| 4 | Stability to mechanical stirring, rpm, not more than | 14,000 |
| table 2 | ||||||||||
| № п / п | Calcium molybdate calcium, mass% | Styreneacrylic dispersion, wt% | Color-forming pigment, mass% | Phosphate dispersant, wt% | Thickener, wt% | Water, mass% | Film resistance to static action of mineral oil, h, n / m | Film resistance to static alkali exposure of 3% NaOH solution, h, n / m | Film resistance to static action of 3% NaCl solution, h, n / m | Film resistance to static action of water, h, n / m |
| 1. | 0.1 | thirty | 1.0 | 0.1 | 0.05 | 68.75 | 3 | 3 | 2 | 10 |
| 2. | 0.1 | thirty | 10 | 1.0 | 0.2 | 58.7 | 3 | 3 | 2 | 10 |
| 3. | 10 | thirty | 1.0 | 0.1 | 0.05 | 58.85 | 25 | 23 | thirty | 200 |
| 4. | 10 | thirty | 10 | 1.0 | 0.2 | 48.8 | 25 | 23 | thirty | 200 |
| 5. | 20 | thirty | 1.0 | 0.1 | 0.05 | 48.85 | 26th | 28 | 40 | 200 |
| 6. | 20 | thirty | 10 | 1.0 | 0.2 | 38.8 | 26th | 28 | 40 | 200 |
| 7. | 0.1 | 40 | 1.0 | 0.1 | 0.05 | 58.75 | 5 | 5 | 2 | 10 |
| 8. | 0.1 | 40 | 10 | 1.0 | 0.2 | 48.7 | 5 | 5 | 2 | 10 |
| 9. | 10 | 40 | 1.0 | 0.1 | 0.05 | 48.85 | 60 | thirty | 50 | 250 |
| 10. | 10 | 40 | 10 | 1.0 | 0.2 | 38.8 | 60 | thirty | 50 | 250 |
| eleven. | 20 | 40 | 1.0 | 0.1 | 0.05 | 38.85 | 60 | thirty | 55 | 280 |
| 12. | 20 | 40 | 10 | 1.0 | 0.2 | 28.8 | 60 | thirty | 55 | 280 |
| 13. | 0.1 | 50 | 1.0 | 0.1 | 0.05 | 48.75 | 5 | 5 | 2 | 12 |
| 14. | 0.1 | 50 | 10 | 1.0 | 0.2 | 38.7 | 5 | 5 | 2 | 12 |
| 15. | 10 | 50 | 1.0 | 0.1 | 0.05 | 38.85 | 55 | 32 | 60 | 260 |
| 16. | 10 | 50 | 10 | 1.0 | 0.2 | 28.8 | 55 | 32 | 60 | 260 |
| 17. | 20 | 50 | 1.0 | 0.1 | 0.05 | 28.85 | 55 | 40 | 60 | 300 |
| 18. | 20 | 50 | 10 | 1.0 | 0.2 | 18.8 | 55 | 40 | 60 | 300 |
| 19. | Prototype | 20 | 10 | 18 | 72 | |||||
CLAIM
Primer-enamel water-dispersion anticorrosive, including a binder-styrene-acrylic dispersion, anticorrosive pigment-calcium molybdate phosphate at a molar ratio of molybdate and phosphate ions from 1: 0.01 to 1: 100, color-forming pigment, phosphate dispersant, thickener and water at The following ratio of components, mass%:
| Acrylic dispersion | 30-50 |
| Calcium molybdate phosphate | 0.1-20 |
| Color-forming pigment | 1-10 |
| Dispersant | 0.1-1.0 |
| Thickener | 0.05-0.2 |
| Water | Rest |
print version
Date of publication 01/18/2007
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