Primer-rust

 

(57) Abstract:

The invention is intended to protect the corroded surfaces of various metals and alloys before the subsequent application of coatings of epoxy, acrylic, alkyd and other materials. The primer includes epoxygenase resin, pigment inhibitors, amine hardener. Primer-rust differs in that it additionally contains glycidyloxy ester of phosphorus acids in the following ratio, wt.h.: epoxygenase resin 100, glycidyloxy ester of phosphorus acids 5-20, pigment 20-50 inhibitors 30-60, amine hardener - stoichiometric quantity. When using this composition improves the adhesion of the primer to the corroded steel surface, expands the range of protected metals, increases resistance to water and corrosive environments, reduced fire risk. table 2.

The invention relates to the paint industry, in particular, compositions waterproof anticorrosive primer for the protection of the corroded surfaces of various metals and alloys before the subsequent application of coatings of epoxy, acrylic, alkyd, drugs. %), liquid glass (1.5 to 1.7 wt. %), solvent (acetone, to 15.4-16.2 wt. %), water (23,8-24,8 wt. %), oxidant (powdered lignosulfonate with a 100% sodium base, and 18.3-19.0 wt. %), fly ash (1.5 to 1.7 wt. %), foaming agent (epoxy resin, 1.5 to 1.7 wt. %), solution of the filler pigment (iron oxide red in drying oil, 1.5 to 1.7 wt. %), phenolic resin (0.3 to 1.1 wt. %).

The disadvantages of this primer are insufficient resistance, low adhesion and protective properties because of the formation of an excess of phosphoric acid water soluble compounds [RF patent 2062819, CL 23 With 22/10, publ. B. I. 18, 27.06.96. Primer-modifier rust. Chernukho VP].

The most similar and the result achieved by the proposed composition is a primer EP-0180 red-brown [THE 6-10-1858-82] intended for priming corroded surfaces of ferrous metals, which is a suspension of pigments and fillers in a solution of epoxy resin e-40 with the introduction of plasticizers and additives. Curing primer spend hardener 1. Viscosity primer on the OT-4 30-60 with the content of nonvolatile substances 74-81, the drying time to degree 3 at 202oC and relative humidity not above aqueous solution of sulfuric acid - not less than 24 hours

Disadvantages primers are low adhesion on corroded steel, the inability to protect non-ferrous metals, insufficient resistance to water and corrosive liquids, high fire danger due to the large number of solvents.

The present invention aims to improve the adhesion of the primer to the corroded steel surface, expansion of the protected metal to improve the resistance to water and corrosive environments, to reduce fire hazard by eliminating solvents.

The problem is solved in that the primer is a rust Converter, including epoxygenase resin, pigment inhibitors, amine curing agent, further comprises glycidyloxy ester of phosphorus acids in the following ratio, wt. including:

Epoxygenase resin - 100

Glycidyloxy ester of phosphorus acids - 5 - 20

Pigment - 20 - 50

Inhibitors - 30 - 60

Amine hardener - Stoichiometric amount of

As epoxygenase resin used resin ED-20 (GOST 105-87-84), e-40 (OST 10-416-76). As hardeners used: PEPA - polyethylenepolyamine (TU 6-02-594-80), UE-M --77), AF-2 - N-crazyechelonkiary (TU 2494-511-0020333521-94). As pigments used titanium dioxide (GOST 9808-94), zinc oxide (TU 6-09-01-760-90). As corrosion inhibitors - zinc phosphate (TU 301-10-033-90), zinc molybdate (TU 301-10-034-90), phosphate chromium (TU 6-18-87-75), strontium chromate (TU 48-4-239-82).

As a rust Converter use glycidyloxy esters of phosphorus acids of General formula

,

where R=

This low-viscosity, transparent, colorless, non-volatile and non-flammable liquids, combine well with epoxygenase resins. As glycidyloxy esters of phosphorus acids were used diglycidylether (R=och3), triglycerol (R=) and diglycidylether (R=CH3).

The inventive primer differs significantly in composition from the prototype. The primer no volatile flammable solvents included in the primer-prototype (ethyl cellosolve, acetone, xylene, and others), fillers (ground talc and powder acid), plasticizer (dibutyl phthalate), oxidant (pyrocatechin).

Enter in the composition of the inventive primer glycidyloxy esters of phosphorus acids perform the role of rust in the transfer of corrosion products in completley glycidyloxy esters of phosphorus acids are embedded in a polymer network due to the disclosure of private epoxy groups. Glycidyloxy esters of phosphorus acids also serve as solvent, eliminating the need to use volatile explosive toxic organic solvents prototype. Glycidyloxy esters of phosphorus acids increase the adhesion of the primer to the substrate by interaction with metal ions on the surface of the substrate and the amine groups of the hardener. As a result of this interaction improves water and chemical resistance primer.

The compositions prepared as follows. Epoxy resin and glycidyloxy esters of phosphorus acids stirred at room temperature for 10-20 min, then enter pigments and inhibitors and dispersed. Before applying to the surface composition is administered in the estimated amount of the hardener. The compositions applied to the surface of steel (St3) without rust and uniformly corroded (the thickness of the layer of corrosion products does not exceed 100 μm), aluminum (D-16), titanium (W-6). The drying is carried out at 202oC and relative humidity above 70%.

The specific formulations of the examples are shown in table 1. The main characteristics of the primers and the state Standards tests are shown in table 2. As can be seen from table 2, the inventive primer, in comparison with the prototype, has better is used to protect non-ferrous metals and alloys. Other indicators of the inventive primer is at the level of a prototype.

Primer is a rust Converter for corrosion protection of steels and non-ferrous metals containing epoxygenase resin, amine hardener, pigment inhibitors, characterized in that it further comprises glycidyloxy ester of phosphorus acids in the following ratio, wt.h.:

Epoxygenase resin - 100

Glycidyloxy ether acids of phosphorus - 5-20

Pigment - 20-50

Inhibitors - 30-60

Amine hardener - Stoichiometric amount,

 

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