Method of producing anticorrosion composition for protecting chemical and petrochemical equipment (versions)

FIELD: chemistry.

SUBSTANCE: according to the first version of the method, an active base - resinous wood, separated through steam distillation from non-recycled wastes from production of epichlorohydrin, is heated to 55-70°C for 0.5-1.0 hours. Epoxy resin "ЭД-20" or "ЭД-18", dioctylphthalate and a solvent are then added. The reaction mixture is stirred at 45-80°C for 1.0-1.5 hours. The components are taken in the following ratio, in wt %: 65-85 active base, 2.0-3.5 of the above mentioned epoxy resin, 0.4-0.6 dioctylphthalate, and solvent constitutes the rest. The second version of the method involves mixing the active base - resinous wood, separated through steam distillation from non-recycled wastes from production of vinyl chloride, and a solvent at 60-70°C for 2 hours. Dioctylphthalate is then added, as well as epoxy resin "ЭД-20" or "ЭД-18" and polyethylenepolyamines, and the reaction mixture is kept at 65-75°C for 2 hours. The components are taken in the following ratio, in wt %: 60-80 active base, 0.35-0.5 dioctylphthalate, 2.8-3.5 of the above mentioned epoxy resin, 0.6-1.2 polyethylenepolyamines, and solvent constitutes the rest.

EFFECT: increased resistance to effect of aggressive media and simplification of preparation of the composition.

4 cl, 2 tbl

The invention relates to the field of chemical and petrochemical industry and can be used to protect chemical and petrochemical equipment, pipelines against corrosion.

Known application of the modified epoxy resin for insulation (see A.S. 1629479 the USSR, EU, 33/138, BI No. 7, 1991) and cementing obtained by mixing alkylresorcinol epoxy resin with the length of the hydrocarbon radical in the side chain of 1 to 3 atoms, an alcohol solution of a Novolac phenol-formaldehyde resin obtained in the molecular ratio of phenol and formaldehyde of 1:0.6, polyvinyl butyral and furfural in a ratio of components, wt.%:

The disadvantage of the above-mentioned composition is insufficient resistance to aggressive media, in particular alkaline and acid (NaOH, KOH, HCl, H₂SO₄N₂S, HNO₃), and the use of scarce raw materials (polyvinyl butyral).

Describes the use of alkylresorcinol epoxy-novolak resin with hardener for isolation and fastening boreholes(A.S. 486129, USSR, EU 33/138, BI No. 36, 1975).

The disadvantage of this technical solution is unstable, the stability of the composition to the effects of reservoir fluids at elevated temperatures and aggressive environments, primarily alkaline and acid.

A method of obtaining a modified epoxy resin for insulation and mounting holes (see U.S. Pat. 2128677 of the Russian Federation, 1999), obtained by mixing a phenol-formaldehyde resin (epoxygenase resin, formalin, diethylene glycol, polyvinyl alcohol in the following ratio, wt.%:

The disadvantage of this structure is its low resistance to aggressive media, especially to alkaline and acid, when used as coatings for protection chemical and petrochemical equipment.

The closest technical solution to the claimed invention is a corrosion-resistant material (patent RU 2171822, C2, 10.08.2001)containing, wt.%: epoxy resin 20,6-22,9, toluene 30,8-41,3, Asmol petroleum derivative polymer of 15.9-17.4 years, dict leftalt of 1.7-2.5, butyl sodium in the form of a 20%solution in butanol 2,8-3,4, carbon 11,2-14,7, polyamines hardener of 6.5 to 8.3.

Corrosion-resistant material similar to the one obtained as follows.

Chopped Asmol petroleum derivative polymer is dissolved in toluene at careful hashing. Later in the solution "Esmola" serves dioctylphthalate, and then butyl sodium. After stirring the mixture in it add epoxy resin, mixed and injected carbon black, continuing to stir the mixture until smooth.

The disadvantages are the counterpart:

1. Low its resistance to aggressive media, especially to alkaline and acid, when used as coatings for protection chemical and petrochemical equipment.

2. The complexity of making the finished product before use in connection with the need to add polyamino hardener, i.e. you must have a corrosion-resistant material and a hardener. The number polyamino hardener is 6.5-8.3 wt.%, which significantly increases the cost of corrosion-resistant material.

3. Due to the fact that polyamine are highly toxic strong-smelling substances, there is a need to create special conditions for the preparation of corrosion-resistant coating.

The objective of the invention is the development of resistant to the action of aggression is different corrosion environments of the composition and facilitate the preparation of anticorrosive composition for protection of the inner and outer surfaces chemical and petrochemical equipment.

The technical result in the use of the invention is expressed in obtaining an anticorrosive composition for coating, resistant to aggressive media, and the facilitation of the preparation of anticorrosive composition for the protection of chemical and petrochemical equipment.

The above result to obtain an anticorrosive composition for coating is achieved by the feature of doing synthesis. In anticorrosive composition No. 1 active - osmole allocated by steam distillation of unusable waste products of epichlorohydrin is stirred at a temperature of 55 to 75°C for 0.5 to 1.0 hours, then mixed with epoxy resin ED-20 or ED-18), dioctylphthalate (DOP) and the solvent, wt.%: butyl acetate:acetone:toluene=12÷14:25÷30:57÷62 stirred at a temperature of 45-80°C for 1.0 to 1.5 hours In anticorrosive composition No. 2 active - osmole allocated by steam distillation of unusable waste products of vinyl chloride, and the solvent is stirred at a temperature of 60-70°C for 2 h, then add the dioctylphthalate, epoxy resin ED-20 or ED-18), polyethylenepolyamine, maintained at a temperature of 65-75°C for 2 hours

Components of anticorrosive composition No. 1, 2, wt.%:

Anticorrosive composition No. 1

Anticorrosive composition No. 2

An active basis - osmole allocated by steam distillation of unusable waste products of epichlorohydrin, have the following composition, wt.%:

An active basis - osmole allocated by steam distillation of unusable waste p is izvodstva vinyl chloride, have the following composition, wt.%:

Corrosion-inhibiting composition which contains components a regulatory materials. As polietileniminov use polyethylenepolyamine THE technical 2413-214-00203312-2002, as dioctylphthalate use DOP plasticizer GOST 8728-88

Anticorrosive composition on the protected surface can be applied by any method: brush, roller, spray or dipping (immersion) without prior Stripping of the surface.

The invention is illustrated by the following examples.

Example 1. Charged to the reactor 65 g osmol production of epichlorohydrin is heated at a temperature of 55-60°C for 1 h, then add 0.4 g DIAC is altalata, 2.0 g of epoxy resin (ED-18), a 32.6 g of solvent, is stirred at a temperature of 45-48°for 1.5 hours

As solvent a mixture of butyl acetate, acetone and toluene in the following ratio, wt.%: 12:26:62.

The resulting composition was tested according to GOST 312-79 on the paint materials. The results of corrosion tests of composition No. 1 shown in table 1.

Example 2. In the conditions of example 1 was charged to the reactor 85 g osmol production of epichlorohydrin is heated to a temperature of 70°C for 1 h, then add 0.6 g of dioctylphthalate, 3,0 epoxy resin ED-20) and 11.4 g of the solvent, the mixture is stirred at a temperature of 75-80°C for 1 h

As solvent a mixture of butyl acetate, acetone and toluene in the following ratio, wt.%: 14:29:57.

The results of corrosion tests of composition No. 1 shown in table 1.

Example 3. In the conditions of example 1 was charged to the reactor 75 g osmol production of epichlorohydrin is heated to a temperature of 65-70°C for 1 h, then add 0.5 g of dioctylphthalate, 3.5 g of epoxy resin (ED-18) and 21.0 g of the solvent, the mixture is stirred at a temperature of 80°for 1.5 hours

As solvent a mixture of butyl acetate, acetone and toluene in the following ratio, wt.%: 13:25:62.

The results of corrosion tests of composition No. 1 are listed in the tables is 1.

Example 4. In the conditions of example 1 was charged to the reactor 92,0 g osmol production of epichlorohydrin is heated at a temperature of 85°C for 0.5 h, then add 1.5 g of epoxy resin ED-20) and 6.4 g of the solvent, the mixture is stirred at a temperature of 42°With over 2,0 hours

As solvent a mixture of butyl acetate, acetone and toluene in the following ratio, wt.%: 13:30:57.

The results of corrosion tests of composition No. 1 shown in table 1.

Example 5. Charged to the reactor 60,0 g osmol production of vinyl chloride, 36,25 g solvent, is stirred at a temperature of 60°C for 2.0 hours, then add 0.2 g of dioctylphthalate, 2.2 g of epoxy resin ED-20), 1.2 g of polyethylenepolyamines, the mixture is stirred at a temperature of 65°for 1.5 hours

As solvent a mixture of butyl acetate, acetone and toluene in the following ratio, wt.%: 12:26:62.

The results of corrosion tests of composition No. 2 are shown in table 2.

Example 6. In the conditions of example 5 was charged to the reactor 76 g osmol production of vinyl chloride, 19,40 g solvent, is heated at a temperature of 70°C for 2.0 hours, then add 0.5 g of dioctylphthalate, 0.35 g, epoxy resin ED-20) and 0.6 g of polyethylenepolyamines, the mixture is stirred at a temperature of 75°With over 2,0 hours

As solvent a mixture of butyl acetate, AC the tone and toluene in the following ratio, wt.%: 14:29:57.

The results of corrosion tests of composition No. 2 are shown in table 2.

Example 7. In the conditions of example 5 was charged to the reactor 80 g osmol production of vinyl chloride, of 26.5 g of solvent, is heated at a temperature of 65°C for 2.0 hours, then add 0.35 g of dioctylphthalate, 2.8 g, epoxy (ED-18), 0.65 g of polyethylenepolyamines, the mixture is stirred at a temperature of 65°With over 2,0 hours

As solvent a mixture of butyl acetate, acetone and toluene in the following ratio, wt.%: 13:25:62.

The results of corrosion tests of composition No. 2 are shown in table 2.

Example 8. In the conditions of example 5 a mixture of 50 g osmol production of vinyl chloride and 43 g of the solvent, is heated at a temperature of 90°C for 1.0 hour, then add 0.5 g of dioctylphthalate, and 4.5 g of epoxy resin ED - 20), 2.0 g of polyethylenepolyamines, is heated at a temperature of 40-45°C and stirred for 3 hours

As solvent a mixture of butyl acetate, acetone and toluene in the following ratio, wt.%: 13:30:57.

The results of corrosion tests of composition No. 2 are shown in table 2.

Examples 1-3, 5-7, provided the artificial aging process parameters, obtaining anticorrosive composition No. 1, confirm compliance with the GOST 312-79 paint and varnish materials (see tables 1 and 2).

Examples 4, 8, provided deviations from allaamah parameters of the process of obtaining anti-corrosion compounds No. 1, 2 reduces the quality of the composition, the latter does not correspond to GOST 312-79 paint and varnish materials (see tables 1 and 2).

1. The method of obtaining anti-corrosion composition for the protection of chemical and petrochemical equipment, pipelines, namely, that the active - osmole allocated by steam distillation of unusable waste products of epichlorohydrin is heated at a temperature of 55-70°C for 0,5-1,0 is, then add epoxy resin ED-20 or ED-18, dioctylphthalate and the solvent, the reaction mixture is stirred at a temperature of 45-80°C for 1.0 to 1.5 hours at the following ratio, wt.%:

2. The method of obtaining the anticorrosion composition according to claim 1, characterized in that the solvent take a mixture of butyl acetate, acetone and toluene in the following ratio, wt.%: 12÷14:25÷30:57÷62.

3. The method of obtaining anti-corrosion composition for the protection of chemical and petrochemical equipment, pipelines, namely, that the active - osmole allocated by steam distillation of unusable waste products of vinyl chloride, and the solvent is stirred at a temperature of 60-70°C for 2 h, then add the dioctylphthalate, epoxy resin ED-20 or ED-18, polyethylenepolyamine, the reaction mixture was kept at a temperature of 65-75°C for 2 h, in the following ratio, wt.%:

4. The method of obtaining the anticorrosion composition according to claim 3, characterized in that the solvent take a mixture of butyl acetate, acetone and toluene in the following ratio, wt.%: 12÷14:25÷30:57÷62.