The method of obtaining anti-corrosive compositions

 

(57) Abstract:

The invention relates to methods of producing anti-corrosive epoxy thixotropic compositions without solvents for coating metal surfaces, for example, containers of oil fields. Way to obtain is the mixing of 1-3 g of epoxy resin, plasticizer, thixotropic agent and a pigment in the presence of 2/3 of the total mass of a copolymer of vinyl chloride with vinyl acetate, and the hardener is mixed with the remainder of the copolymer of vinyl chloride with vinyl acetate. The coating composition obtained by the proposed method, has a high resistance to temperature gradient and to aggressive media at elevated temperatures, and is environmentally friendly. table 1.

The invention relates to methods of producing anti-corrosive epoxy thixotropic compositions without solvents for coating metal surfaces, such as tanks, oil fields, storage of oil and products of its processing.

A method of obtaining anti-corrosive composition for protective coloration underground storage of gasoline by mixing epoxy resin, pitch, mica, hardener amine type and Dabam, have insufficient resistance to the effects of temperature gradient and lack of resistance to aggressive media at elevated temperatures.

Also known is a method of obtaining anti-corrosive composition for ship tanks by reacting a saturated or unsaturated aliphatic acid and an epoxy resin and adding pigment, filler, hardener and other additives (Japan Patent N 53-22507, CL C 11 C 1/00, 1978).

Coatings on the basis of the thus obtained compositions have insufficient resistance to the effects of temperature gradient and lack of resistance to aggressive media at elevated temperatures.

A method of obtaining anti-corrosive composition for protecting metal pipes, tanks, etc. is that the mixture of epoxy resin, plasticizer, coal tar, talc and other additives pass through a sieve with a mesh size 80 mesh, is mixed with a hardener of amine type and add 3% water (Japan Patent N 53-11531, class C 09 D 5/08, 1978).

The coating composition obtained in this way have insufficient resistance to temperature gradient and the lack of stand is about the technical essence and the achieved result is a method for anticorrosive thixotropic composition for protecting metal surfaces in closed trudnovospituemyh marine vessels, for example, oil, which consists in the fact that the suspension of the iron oxide red in the plasticizer (goldroom ether or Epoxide) mixed with epoxy resin ED-20, preheated to 50 - 70oC, and thixotropic agent Aerosil and enter before applying the hardener DTB-2.

(Temporary technological regulations N 1-1-3-6/85 production primer PSU-0126 and enamel PSU-421 "bead-disolving" technology. Leningrad, Leningrad scientific-production Association "Pigment", 1985).

Coatings on the basis of the composition obtained by the method of the prototype, have not sufficiently high resistance to the effects of temperature gradient and lack of resistance to aggressive media at elevated temperatures.

The technical result, which is provided by the claimed invention, reflected in the increasing resistance of the coating to the effects of temperature gradient and to aggressive media at elevated temperatures.

The achievement of the technical result is ensured by the fact that in the method of obtaining anti-corrosive composition by mixing epoxy resin, plasticizer, thixotropic agent, and the introduction before applying the epoxy hardener is the weight of a copolymer of vinyl chloride with vinyl acetate, and the curing agent are pre-mixed with the remainder of the copolymer of vinyl chloride with vinyl acetate.

The prior art proposed methods method to achieve the above result is unknown, therefore, the alleged invention meets the criterion of "inventive step".

The method is used:

1. Epoxy Dianova resin grades ED-14, ED-16, ED-20 ED-21, ED-22 (GOST 10587-84), etc.

2. Hardeners:

- product interaction Diethylenetriamine and butyl methacrylate (m DTB, THE 6-05-241-224-79);

- polyethylenepolyamine (TU 6-02-594-85);

- ethylenediaminetetra (m Agidol AF-2, TU 2494-511-00203521-94);

- dicyandiamide (GOST 6988-73) and others.

3. Plasticizers:

- dibutyl phthalate (GOST 8728-88);

- dioctylphthalate (GOST 8728-88);

- oligomer of propylene oxide (m Naproxin 703, THE 2226-201-10488057-94);

- glycidyloxy ether (TU 6-10-11-127-21-76) and others.

4. Thixotropic agents:

- Aerosil (m AMC, THE 6-18-12-80);

- organophilic bentonite (GOST 19608-84);

- micro-talc (GOST 19284-79) and others.

5. Pigments:

- chromate strontium (TU 48 of the Republic of Tajikistan 0516-4-94);

- phosphate chromium (TU 6-18-87-85);

- chromium oxide (GOST 2912-79);

iron SW-01-1181-87), etc.

The following are examples of implementation of the method.

Example 1. In disolver running agitator load of 100 g of epoxy resin ED-20, 40 g of dibutyl phthalate, 20 g of Aerosil AMC,

68 g of strontium chromate and 20 g of a copolymer of vinyl chloride with vinyl acetate brand And-15 with a molecular weight of 5000 - 10000 (15% vinyl acetate content by weight) and stirred for 1 hour at room temperature.

Before use, 40 g of polyethylenepolyamine introduced 10 g of copolymer a-15 and stirred for 1 hour at room temperature, and then this mixture is introduced into the above composition.

Example 2. In disolver running agitator load of 100 g of epoxy resin ED-16, 60 g pilgramage ether, 10 g organohalogen bentonite, 50 g of chromium phosphate and 10 g of saponified copolymer of vinyl chloride with vinyl acetate brand-15-0 with a molecular weight of 8000 - 10000 (15% vinyl acetate content by weight) and stirred for 2 h at room temperature.

Before using 60 g of the hardener m Agidol-AF-2 enter 5 g of the copolymer a-15-0 and stirred for 1 h at room temperature, and then this mixture is introduced into the above composition.

Example 3. In disolver working with me is Rick and 16 g of a copolymer of vinyl chloride with vinyl acetate brand And-15 with a molecular weight of 10000 (15 - the percentage of vinyl acetate by weight) and stirred for 3 h at room temperature.

Before applying in 52 g of hardener m DTB-2 administered 8 g of copolymer a-15 and stirred for 1 h at room temperature, and then this mixture is introduced into the above composition.

The composition obtained by the proposed method, applied by brush, roller or airless spray and other methods, the layer thickness of 200 μm, the primer based on epoxy resin on metal.

The table presents the test results of the composition obtained by the proposed method in comparison with the composition obtained by the method of the prototype, according to the authors.

The viability of the compositions was determined as the time prior to its thickening after adding the hardener.

The resistance of coatings to the effects of temperature gradient was estimated by time of exposure to the temperature gradient, during which the coating adhesive strength under normal isolation of fungi was reduced to a value of 10 kg/cm2.

Water absorption of the coatings was evaluated by the ratio of the weight of the coating to the initial weight after soaking in distilled water.

As SL is compared with the coating composition, obtained by the method of the prototype, has a high resistance to the effects of temperature gradient and to aggressive media at elevated temperatures.

In addition, the composition obtained by the proposed method is environmentally friendly.

The method of obtaining anti-corrosive composition by mixing epoxy resin, plasticizer, thixotropic agent, a pigment and the introduction before applying curing agent, wherein the epoxy resin, a plasticizer, a thixotropic agent and the pigment is stirred for 1 to 3 h in the presence of 2/3 of the total mass of a copolymer of vinyl chloride with vinyl acetate, and the curing agent are pre-mixed with the remainder of the copolymer of vinyl chloride with vinyl acetate.

 

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