Epoxy composition for protection against corrosion of machine parts and mechanisms

 

(57) Abstract:

Usage: the invention relates to epoxy compositions and can be used for protection against corrosion of machine parts and mechanisms, working in contact with corrosive environments in engineering, and to protect sites of drilling and oil field equipment. The invention solves the technical problem of increasing the strength of the epoxy composition. The invention consists in that the known epoxy composition for corrosion protection of parts of machines and mechanisms, including epoxy resin ED-20, the resin oxilan-5 or oxilan-6, aminophenolic hardener AF-2, Aerosil, according to the invention further comprises a polyethylenepolyamine, toluene and aluminum powder in the following ratio, wt.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, polyethylenepolyamine 6-9, toluene 12-18, aluminum powder 15-25. 3 table.

The invention relates to epoxy compositions and can be used in mechanical engineering for corrosion protection of parts of machines and mechanisms, working in contact with corrosive environments, and to protect sites of drilling and oil is used to protect against corrosion by painting the springs and other elastic parts of machines and mechanisms /Reibman A. I. Protective paint coating. L.: Chemistry, 1982/. However, the joint effect of operational factors (environments and mechanical stress) is the rapid aging of paints, accompanied by embrittlement and delamination of the coating from the surface of the coated parts.

The closest technical solution to the claimed invention is an epoxy-Actilingua composition /C. I. Safronchik. Corrosion protection of building structures and technological equipment. HP: stroiizdat, 1988 , S. 57, table. II, formula X/ containing epoxy resin ED-20, the resin oxilan-5 or oxilan-6, aminophenolic hardener AF-2, furrowy alcohol, graphite powder, Aerosil in the following ratio, wt.h.:

Epoxy resin ED-20 - 15

Resin oxilan-5 or oxilan-6 - 85

Aminophenolic hardener AF-2 - 25

Furrowy alcohol - 20

Graphite powder - 40

Aerosil - 3,5

However, the known composition after its application and curing is not strong enough for the operation to epoxy compositions.

The present invention solves the technical problem of increasing the strength of the epoxy composition.


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

Epoxy composition for protection against corrosion of machine parts and mechanisms are made on the basis of epoxy resin ED-20 in the form of ready-made compounds with other additives in accurate dosing and mixing, and curing AF-2 and polyethylenepolyamine add last. Physico-mechanical properties were determined on samples obtained by curing the compositions in the forms at a temperature of 18 - 22oC for 48 hours (table. 1).

Examples of preparation and testing.

Example 1. Epoxy resin ED-20 of 78 wt.h., the resin oxilan-5 22 wt.h., Aerosil 3 wt. 'clock, toluene 15 wt.h., the aluminum powder 20 wt.h. carefully mix in a glass jar, then add the polyethylenepolyamine 6 wt. am and AF-2 7 wt.h., continuing intensive mixing. According to army or applied to the surface of the substrate steel (20). The curing of the samples was performed at room temperature for 48 hours, after which determine the properties. The results are given in table 2.

Obtained according to the example 1 composition was coated spring mechanical seals pumps CNS-160, pumping saline water in the system reservoir pressure maintenance. Mineral composition of water, g/l:

NaCl - 70

N2SO4- 1

NHSO4- 0,03

MgCl2- 4

KCl - 40

CaCl - 20

H2S - 5

The springs are made of wire of 1.6 mm diameter steel WA GOST 1071-81. The average time to failure of the mechanical seals with springs without coverage is 4200 hours. Installation is covered springs helped to increase the average time to failure of the mechanical seals up to 12000 hours.

Example 2. Epoxy resin ED-20 of 82 wt.h., the resin oxilan-5 18 wt.h., Aerosil 3,5 wt.h., toluene 15 wt.h., the aluminum powder 20 wt.h. carefully mix in a glass vessel, and then, continuing intensive mixing, add hardeners: polyethylenepolyamine 9 wt.h. and AF-2 5 wt.h. The composition was filled in the appropriate form or applied to the surface of the substrate steel (20). The curing of the samples was carried out at the aulani in table 3.

The composition according to example 2 were coated spring wire according to GOST 14963-69 of steel S valve type COB and the valve springs mud pump NBT-600. Drilling was used moderately mineralized clay solution containing 10% NaCl. The resistance of a spring after coverage has increased in 1,5-2 times.

To obtain this invention epoxy compositions used epoxy resin ED-20 GOST 10587-84, the resin oxilan-5 or oxilan-6 TU 6-02-1376-87, AF-2 TU 6-05-1663-79, Aerosil GOST 14922-77, polyethylenepolyamine (Pepa) THAT 202.2-906-86, toluene GOST 5789-78, aluminum powder GOST 5494-79.

Epoxy composition according to the invention can be used in machine building, oil and gas industry.

Epoxy composition for corrosion protection of parts of machines and mechanisms, including epoxy resin ED-20, oxilan-5 or oxilan-6, aminophenolic hardener AF-2 and Aerosil, characterized in that it further comprises a polyethylenepolyamine, toluene and aluminum powder in the following ratio, wt.h.:

Epoxy resin ED-20 - 78 - 82

Resin oxilan-5 or oxilan-6 - 18 - 22

Aminophenolic hardener AF-2 - 5 - 7

Aerosil - 3

 

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