Aqueous epoxide corrosion-stable priming

FIELD: building materials.

SUBSTANCE: invention relates to a method for preparing an aqueous epoxide corrosion-stable priming used for protection against corrosion and no containing hexavalent chrome compounds. Priming comprises aqueous epoxide compound based on bisphenol A diglycidyl ester, hardening agent and chromate-free pigment inhibiting corrosion. Hardening agent is taken among the group comprising aqueous modified adducts of amines or polyamidoamines decreasing the water content. Chromate-free pigment inhibiting corrosion comprises chromate-free pigment additive inhibiting corrosion that is taken among the group comprising mixtures of cerium molybdate with bismuth vanadate, cerium molybdate with strontium tungstate, cerium phosphate with strontium tungstate, bismuth vanadate with bismuth molybdate and strontium tungstate, and their mixtures also. Pigment-filling agents and hydrophobic hardening agent are added to the priming composite for enhancing waterproofness and corrosion resistance. Invention provides excluding the negative effect of hexavalent chrome on environment objects and human body.

EFFECT: improved and valuable properties of priming.

4 ex

 

The present invention relates to corrosion-resistant undercoating, and more specifically the corrosion resistant primer water-based epoxy compounds which do not contain compounds of hexavalent chromium.

The level of technology

Structural alloys, including alloys of aluminum, steel and the like, usually used in aerospace, shipbuilding, automotive and other industries. Typically, these alloys are used for protection against corrosion by applying primers or organic coatings containing corrosion inhibitors. Usually corrosion-resistant primers used for structural alloys are epoxy primer, solvent-based, and primers as active corrosion inhibitors use of hexavalent chromium in the composition of the pigment additives. Anti-corrosive action of such primers based on shestiletnei chrome. All forms of hexavalent chromium are included by the American national Institute for environmental protection in the group I, including carcinogens for humans. Legislation in many countries, the use of chromium is strictly limited, particularly Federal and state laws of the United States on the reduction of volatile organic compounds (VOCS) based on hexavalent chromium in which the ASCI and primers, in which the focus is on water and/or reducing the water content of the polymer binder. In regard to inhibiting corrosion compounds containing hexavalent form of chromium, strict restrictions and they are controlled. Therefore, the decrease in the content of hexavalent chromium in the composition inhibiting additives such primers is of great importance.

In the patent JP 2002-121469 disclosed coating composition containing a water-soluble resin selected from epoxy-ether resins and alkyd resins, water-soluble melamine resin and achromatic pigment, inhibiting corrosion, which is a phosphate or tofinou system. This known coating contains no heavy metals, and the above pigment, corrosion inhibition, is used acidic salt of phosphoric acid containing cerium, titanium, zirconium or tin.

Disclosure of inventions

Based on the foregoing, the main object of the present invention is the elimination of the negative effects of hexavalent chromium on the environment and the human body. This task is solved by the development of corrosion-resistant primer, not containing hexavalent chromium and which is effective to prevent the ravages of corrosion on structural the Plav metals, particularly effective for the prevention or deceleration of both types of corrosion: basic corrosion and pitting corrosion (pitting).

The above and other objectives and advantages of the present invention, which will be clear from the following description, are achieved by all the characteristics given in the formula of the present invention.

In the present invention include a water epoxy corrosion resistant primer containing aqueous epoxy compound (waterborne epoxy), curing agent and bichromatic inhibiting corrosion pigment. Bichromatic inhibiting corrosion of the pigment according to the present invention includes bichromate inhibitory corrosion pigment additive in combination with other pigment fillers, etc. Bichromate inhibitory corrosion pigment additive chosen from the group comprising a mixture of cerium molybdate with bismuth Vanadate, molybdate oxide with strontium tungstate, phosphate of cerium with strontium tungstate, bismuth Vanadate with bismuth molybdate and strontium tungstate, and mixtures thereof. Above all, preferred bichromates, inhibiting corrosion additive for coatings is a mixture of cerium molybdate with strontium tungstate.

The implementation of the invention

The present invention relates to bichromates water epoxy corrosion-resistant Grun the information, including water epoxy compound (a polymer or resin with epoxypropoxy), curing agent and bichromate inhibitory corrosion additive.

Bichromatic inhibiting corrosion of the pigment according to the present invention includes (1) bichromate inhibitory corrosion additive which is selected from the group comprising a mixture of cerium molybdate with bismuth Vanadate, molybdate oxide with strontium tungstate, phosphate of cerium with strontium tungstate, bismuth Vanadate with bismuth molybdate and strontium tungstate, and mixtures thereof, and (2) pigments and fillers, which are selected from the group including titanium dioxide, clay, calcium carbonate or aluminum silicate, talc or magnesium silicate, zinc oxide, and barites or barium sulfate. Content bichromate inhibiting corrosion pigment (which is a mixed pigment comprising bichromate inhibitory corrosion additives and pigments and fillers) is a number of from 25 to 60 wt.%, preferably from 40 to 55 wt.% in the calculation of the full (final) the composition of the primer. Content bichromates inhibiting corrosion additive is 5 to 40 wt.%, preferably from 15 to 40 wt.% and more preferably from 25 to 35 wt.% or from 25 to 30 wt.% in the calculation of the full composition of the pigment.

In a preferred variant embodiment of the present image is the shadow of aqueous epoxy corrosion resistant primer consists of an aqueous epoxy compound, which is chosen from the group comprising non-volatile water dispersion of modified epoxy compounds based on diglycidylether ether of bisphenol a with a weight per epoxy group (M/e) from 450 to 700, and a viscosity of from 12000 to 19000 SP (12 to 19 PA·). In another variant embodiment of the present invention, the dispersion comprises a polymer with an average molecular weight, and the dispersion is a dispersion of a polyfunctional resin with an average molecular weight, which when cured forms a polymer with a high degree of crosslinking and extremely high strength and durability. In yet another variant embodiment, the dispersion is an aqueous dispersion of semi-standard epoxy resin based on bisphenol a with a high molecular weight. The water content of the epoxy compound is from 5 to 50 wt.%, preferably from 15 to 30 wt.% in the calculation of the full composition of the primer.

Curing agent of the present invention are selected from the group comprising water or reducing the water content of the modified adducts of amines or polyamidoamine, amine number ranging from 300 to 450. In particular, as components to obtain adducts can be used monoamines, including secondary or tertiary amines, are known, for example, from the patent RU 2083616. Secondary is e amines include, in particular, diallylamine (for example, diethylamine, di-n-Propylamine, Diisopropylamine, di-n-butylamine, di-n-octylamine and di-n-dodecylamine), piperidine, morpholine, secondary alkanolamine (diethanolamine, N-methylethanolamine, N-butylethylamine, diisopropanolamine, N-methylisophthalic or di-n-butanolate).

In a preferred variant embodiment of the present invention curing agent, in addition, includes a hydrophobic curing agent designed to improve the water resistance and corrosion resistance. The content of the curing agent is from 2 to 20 wt.%, preferably from 5 to 15 wt.% in the calculation of the full composition of the primer.

Bichromate epoxy corrosion resistant primer of the present invention are primarily used to prevent General corrosion and pitting of metal substrates, especially aluminum alloys, steel alloys, stainless steel, high strength alloys, stainless steel, etc. Bichromate water epoxy compounds of the present invention can be used in all industries, including aerospace, automotive, construction, packaging production, heating and air conditioning, Navy.

Inhibiting corrosion properties bichromates water of epoxy corrosion is resistant primer of the present invention are described in the following example.

Example

Four compositions of aqueous epoxy primers receive as shown in table 1. For testing anti-corrosive properties of these primers use aluminum surface. Before applying the first coat anodize aluminum surface or washed with phosphoric acid. The samples incubated in the conditions of the tests for resistance to salt spray under ASTM B117. Then the samples are evaluated for signs of corrosion and pitting and compared with control samples of epoxy primer on the basis of strontium chromate per MIL-H-85582. Corrosion-resistant properties of the aqueous epoxy primers according to the present invention is evaluated by comparison with chromatogram primers. Despite the fact that the four primers show no inhibiting corrosion properties, comparable with chromatogram primers, the primers are inhibiting corrosion properties, and this eliminates the risk to the health of personnel.

Table 1.

Water epoxy primer
Primer, NoBulk pigment content, %ComponentsMass, g
The primer I20Epoxy80,00
ÈA; The cerium molybdate48,30
The strontium tungstate61,90
The cerium nitrate1,00
Phenyl ether of propylene glycol8,00
4-Hydroxy-4-methyl-2-pentanon12,00
Deionized water35,00
Amine curing agentto 6.80

Primer, NoBulk pigment content, %ComponentsMass, g
Primer25Epoxy75,00
IIThe cerium molybdate60,37
The strontium tungstate77,36
The cerium nitrate1,00
Phenyl ether of propylene glycol7,50
4-is hydroxy-4-methyl-2-pentanon 15,00
Deionized water40,00
Amine curing agent7,50
Primer30Epoxy70,00
IIIThe cerium molybdate72,45
The strontium tungstate92,85
The cerium nitrate1,00
Phenyl ether of propylene glycol7,00
4-Hydroxy-4-methyl-2-pentanon20,00
Deionized water60,00
Amine curing agent8,90
Primer35Epoxy65,00
IVThe cerium molybdate84,52
Saligramam strontium108,32
The cerium nitrate1,00
Phenyl ether of propylene glycol6,50
4-Hydroxy-4-methyl-2-pentanon25,00
Deionized water70,00

It should be understood that the present invention is not limited to the options provided for illustration in this description, and are only illustrative of the best variants of embodiment of the invention and may be modified in form, arrangement of elements and the detailed execution of the techniques. The invention covers all such modifications are included within the scope and essence of the invention as defined in the claims.

1. Water epoxy corrosion resistant primer containing aqueous epoxy compound based on diglycidylether ether of a bisphenol, a curing agent selected from the group comprising water or reducing the water content of the modified adducts of amines or polyamidoamine, and bichromatic inhibiting corrosion pigment containing bichromate inhibitory corrosion pigment additive which is selected from the group comprising a mixture of cerium molybdate with bismuth Vanadate, molybdate oxide with strontium tungstate, phosphate of cerium with strontium tungstate, Vanadate Vism is that with bismuth molybdate and strontium tungstate, as well as mixtures thereof.

2. The primer according to claim 1, characterized in that the said aqueous epoxy compound is a water-non-volatile dispersion of modified epoxy compounds with a mass per epoxy group of from 450 to 700, and a viscosity of 12 to 19 PA·C.

3. The primer according to claim 2, characterized in that the dispersion is based on polyfunctional resin having an average molecular mass and forming curing the polymer with a high degree of crosslinking and with extremely high strength and durability.

4. The primer according to claim 2, characterized in that the variance based on water dispersion of semi-standard epoxy resin based on bisphenol a and the epoxy resin has a high molecular weight.

5. The primer according to claim 2, characterized in that the content of the above water epoxy compound is from 5 to 50 wt.% in the calculation of the full composition of the primer.

6. The primer according to claim 2, characterized in that the content of the above water epoxy compound is from 15 to 30 wt.% in the calculation of the full composition of the primer.

7. The primer according to claim 1, characterized in that the modified adducts of amines or polyamidoamine have an amine number of from 300 to 450.

8. The primer according to claim 7, characterized in that it further comprises a hydrophobic curing agent for whom avicenia water resistance and corrosion resistance, represents a phenyl ether of propylene glycol and/or 4-hydroxy-4-methyl-2-pentanone.

9. The primer according to claim 7, characterized in that the content of the above curing agent is from 2 to 20 wt.% in the calculation of the full composition of the primer.

10. The primer according to claim 7, characterized in that the content of the above curing agent is from 5 to 15 wt.% in the calculation of the full composition of the primer.

11. The primer according to claim 1, characterized in that bichromatic inhibiting corrosion of the pigment further comprises pigments and fillers.

12. The primer according to claim 11, characterized in that bichromates inhibiting corrosion additive is a mixture of cerium molybdate with strontium tungstate.

13. The primer according to claim 11, characterized in that the content bichromates inhibiting corrosion additive is from 15 to 40 wt.% in the calculation of the full composition of the pigment.

14. The primer according to claim 11, characterized in that the content bichromates inhibiting corrosion additives ranges from 25 to 30 wt.% in the calculation of the full composition of the pigment.

15. The primer according to claim 11, characterized in that the content bezrobotnego inhibiting corrosion of the pigment ranges from 25 to 60 wt.% in the calculation of the full composition of the primer.

16. The primer according to claim 11, characterized in that the content bezrobotnego Inga is youseo corrosion pigment is from 40 to 55 wt.% in the calculation of the full composition of the primer.

17. Primer according to item 13, wherein the content bezrobotnego inhibiting corrosion of the pigment ranges from 25 to 60 wt.% in the calculation of the full composition of the primer.

18. Primer on 14, characterized in that the content bezrobotnego inhibiting corrosion of the pigment ranges from 40 to 55 wt.% in the calculation of the full composition of the primer.



 

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1 tbl

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1 tbl

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