Epoxy composition for corrosion protection

 

The invention relates to a protective coating of metal and concrete surfaces used in high corrosive activity. The composition contains a film-forming epoxy resin ED-20 and bitumen varnish, filler is an aluminum powder or iron oxide, an organic solvent, hardener - polyethylenepolyamine, modifier rubber SOPS. A certain combination of components provides increased resistance to water, aggressive media, frost resistance, physical and mechanical properties. 1 C.p. f-crystals, 2 tab.

The invention relates to a protective coating of metal and concrete surfaces, used in conditions of high corrosiveness.

Known anti-corrosion coating according to the patent 2118644 Composition for coating", IPC 09 D 123/22.

The composition contains, by weight.h.: Butyl rubber (dry matter) - 100 Pigments - 56 - 223 Filler - 260 - 410 Organic solvents - 490 - 650 Epoxy resin ED-20 - 3,5 - 2,5 Stearate zinc - 4,0 - 10,8 Aerosil-380 - 1 - 3 the Disadvantages of the above are similar to the high content of organic solvents and not enough high physical-mechanical characteristics.

It is also known movesoctober powder of zinc in the environment orhangazispor thermoplastic binder, and one coating layer containing aluminum powder in the environment orhangazispor thermoplastic binder.

The main disadvantage of this coating is a multi-stage and the complexity of the application on a protected surface.

Closest to the proposed composition of the technical essence and the achieved result is epoxy composition for protection against corrosion of machine parts and mechanisms on the application 98121154/04 from 23.11.98, Patent 2165947, IPC 09 D 5/10.

The composition comprises, by weight.h.: Epoxy resin ED-20 - 78 - 82
Resin oxilan-5 or oxilan-6 - 18 - 22
Aminophenolic hardener AF-2 - 5 - 7
Aerosil - 3 - 3,5
The polyethylenepolyamine - 6 - 9
Toluene - 12 - 18
Powder aluminum - 15 - 25
However, the known composition after its application and curing does not have sufficient anti-corrosion and waterproof properties.

The objective of the invention is to provide a composition having high resistance to water, aggressive media, frost resistance, high physical-mechanical properties.

The problem is solved due to the fact that well-known composition for corrosion protection containing film-forming epoxy resin ED-20, the filler is an aluminum alloy is Thor - rubber SOPS, and as a film-forming further comprises bitumen varnish BT-577 in the following ratio, wt.h:
Epoxy resin ED-20 - 40 - 60
Bitumen varnish - 40 - 60
Aluminum powder - 15 - 20
The organic solvent is 5 to 20
The polyethylenepolyamine - 4,5 - 7
Rubber SOPS-FOR - 5 - 10
In addition, the epoxy composition for corrosion protection as filler may contain iron oxide in the amount of 5-10 wt.h.

Introduction in the composition of low molecular weight rubber SOPS FOR representing polydieneurethane with terminal epoxy groups, can improve the physical-mechanical characteristics of the cured coating, and when combined with epoxy resins with bitumen increase the protective action of the coating, aided by members of the bitumen aromatic and heterocyclic compounds, has inhibiting effect on the steel in the water.

The composition uses the following components:
As a binder:
epoxy resin ED-20 GOST 10587-84,
bitumen varnish BT-577 GOST 5631 -79.

As fillers:
aluminum powder PAP-2 GOST 5494-72,
iron oxide GOST 8135-74.

As solvents:
butyl acetate GOST 8981-78,
atrazin brand AND THE 2413-257-00203447-99.

Modifier:
low molecular weight rubber SOPS FOR the brand AND THE 003326-86.

Examples of the preparation of compositions
Example 1
Epoxy resin ED-20 50 wt.h., bitumen varnish BT-577 50 wt.h., rubber SOPS-8 wt.h., the solvent 18 wt.h., powder aluminum 18 wt.h., carefully mix in a glass jar, then add the polyethylenepolyamine of 5.8 wt.h. Depending on what characteristics to be determined, prepared composition fill out the appropriate form or applied to the surface of the substrate. The curing of the samples was performed at room temperature for 7 days, after which determine the properties. The results are given in table 2.

Example 2
Epoxy resin ED-20 50 wt.h., bitumen tank BT-577 50 wt.h., rubber SOPS-7 wt. o'clock , iron oxide 7 wt.h., the solvent 9 wt.h., carefully mix in a glass vessel, and then, continuing intensive mixing, add the polyethylenepolyamine of 5.7 wt.h. Composition fill in the appropriate form or applied to the surface of the corresponding substrate. The curing of the samples was carried out at room temperature for 7 days, after which he spent defining properties. The results of the measurements are presented in table 2.

Examples of the AK can be seen from table 2, the composition has a high resistance to water, aggressive media, frost resistance, high physical-mechanical properties.


Claims

1. Epoxy composition for corrosion protection containing film-forming epoxy resin ED-20, the filler is an aluminum powder, an organic solvent, hardener - polyethylenepolyamine, characterized in that it further comprises a modifier rubber SOPS, and as a film-forming further comprises bitumen varnish BT-577 in the following ratio, wt.h.:
Epoxy resin ED-20 - 40 - 60
Bitumen varnish BT-577 - 40 - 60
Aluminum powder - 15 - 20
The organic solvent is 5 to 20
The polyethylenepolyamine - 4,5 - 7
Rubber SOPS-FOR - 5 - 10
2. Epoxy composition for protection against corrosion under item 1, characterized in that the filler contains iron oxide in the amount of 5-10 wt. PM

 

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