A method of obtaining a protective composition for pipes

 

(57) Abstract:

The invention relates to methods for protective epoxy thixotropic compositions without solvents intended for use on pipes for various purposes. Mix epoxy resin of high and low molecular weight in the presence of the acrylic copolymer in a certain number of 2-6 hours at 80-100oC, cooled to 20oWith and with stirring, add a plasticizer, a thixotropic agent, a pigment and is dispersed. The coating obtained by the proposed method has high smoothness and resistance to alternating temperatures and aggressive environments. table 1.

The invention relates to methods for protective epoxy thixotropic compositions without solvents intended for use on pipes for various purposes, in particular on the inner surface of the pipe oilfield equipment.

A method of obtaining protective compositions for metal pipes by moving before the use of compositions A and B in the ratio 1:1 -1:3. The composition contains A curing agent (adduct Dianova epoxy resin and polyamine), powder of oxide, TiO, thixotropic agent (lo). Composition B contains Dianova epoxy resin with a molecular weight of 450, electrocorundum powder, TiO, thixotropic agent (colloidal SiO), methanesiliconic oil, plasticizer (Patent Poland N 135583, C 08 L 63/00, 1986).

Coatings on the basis of the composition obtained as described, have insufficient smoothness and lack of resistance to alternating temperatures and aggressive environments.

In the French patent N 1597972, C 08 G 45/00, 1970 describes a method for protective composition for water and sewer pipes by mixing of compositions A and B in the ratio 1:1. Composition A contains epoxy resin low molecular weight, a thixotropic agent, a pigment and a neutral filler. Composition B contains epoxy resin low molecular weight, the curing agent (aliphatic polyamine), a plasticizer, a thixotropic agent, a pigment and a neutral filler.

The thixotropic agent is administered in A composition after dispersion of pigments and fillers in epoxy resin, and the composition B - after dispersion of pigments and fillers in the compound.

The product of mixing of compositions A and B is subjected to slow agitation when lifting temperature vacuum filter.

Coatings on the basis of the composition obtained by the above method, is insufficient smoothness and lack of resistance to alternating temperatures and aggressive environments.

Also known is a method of obtaining protective thixotropic composition for application to the inner surface of the pipe by mixing epoxy and coal tar, thixotropic agent and glass spheres of two different diameters (U.S. Patent N 4455329, B 05 D 7/22, 1984).

Coatings on the basis of the composition obtained in this way are insufficient elasticity in bending, smoothness and resistance to alternating temperatures.

Closest to the claimed method according to technical essence and the achieved technical result is a method of obtaining a protective composition for metal surfaces, such as inner surfaces of the pipes, by mixing suspensions of iron oxide red in the plasticizer (goldroom ether or Epoxide), epoxy resin ED-20 (m m 390-430), heated to 50-70oC, thixotropic agent Aerosil and introduction before use hardener DTB-2.

(Temporary technological regulations N 1-1-3-6/85 production GRU is EDINENIE "Pigment", 1985).

Coatings on the basis of the composition obtained by the method of the prototype, have insufficiently high smoothness and high enough resistance to alternating temperatures and aggressive environments.

The technical result, which is provided by the invention, is expressed in increasing the smoothness of the coating and improve its resistance to alternating temperatures and aggressive environments.

The achievement of the technical result is ensured by the fact that in a method of producing a protective composition for tubes by mixing preheated epoxy resin, plasticizer, thixotropic agent, a pigment and the introduction before applying the hardener are first mixed epoxy resin of molecular weight 390-430 with epoxy resin molecular weight 1800-2300 in the presence of a copolymer of butyl methacrylate, methyl methacrylate and methacrylic acid in the amount of 1-3% of the epoxy resin within 2-6 hours at a temperature of 80-100oC, and then cooled to 202oC the mixture was added with stirring, a plasticizer, a thixotropic agent, a pigment and is dispersed.

The prior art proposed methods method d is the criterion of "inventive step".

The method is used:

1. Epoxy resin of molecular weight 390-430 (M. ED-20, GOST 10587-84), etc.

2. Epoxy resin of molecular weight 1800-2300 (m e-23, THE 2225-100-05034239-97), etc.

3. Plasticizers:

- dibutyl phthalate (GOST 8728-88)

- dioctylphthalate (GOST 8728-88)

- oligomer of propylene oxide (m Naproxin 703, THE 226-201-10488057-94).

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

4. Thixotropic agents:

- Aerosil (m AMC, THE 6-19-12-80)

- 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 oxide red (GOST 8135-74) and others.

6. Hardeners:

- product interaction Diethylenetriamine and butyl methacrylate (m DTV-2, TU 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.

7. Any copolymers of butyl methacrylate, methyl methacrylate and methacrylic acid.

The following are examples of implementation of the method.

Example 1. In disolver running agitator load of 50 g of EPO acid in the ratio of 85:12:3 and a molecular weight in the range 64000-100000, increase the temperature to 90oC and stirred for 4 hours the mixture is Then cooled to a temperature of 202oC add with stirring, 40 g of dibutyl phthalate, 20 g of Aerosil AMC, 68 g of strontium chromate and dispersed to milling degree not more than 30 μm.

Example 2. In disolver running agitator load of 80 g of epoxy resin ED-20, 2 g of epoxy resin 3-23, 3 g of a copolymer of butyl methacrylate, methyl methacrylate and methacrylic acid in a ratio of 85:14:1 and a molecular weight in the range 64000-100000, increase the temperature to 80oC and stirred for 6 hours the mixture is Then cooled to a temperature of 202oC add with stirring 60 g pilgramage ether, 10 g organohalogen bentonite, 50 g of chromium phosphate and dispersed to milling degree not more than 30 μm.

Example 3. In disolver running agitator load of 20 g of epoxy resin ED-20, 80 g of epoxy resin 9-23, 2 g of a copolymer of butyl methacrylate, methyl methacrylate and methacrylic acid in a ratio of 85:12:2 and a molecular weight in the range 64000-100000, increase the temperature to 100oC and stirred for 2 h

Then cooled to a temperature of 202oC add with stirring 50 g of plasticizer m Naproxin 703, 17 g microtool the proposed method, applied by brush, roller or airless spray and other methods with a layer thickness of 200 μm on the ground on the basis of epoxy resin on metal, concrete, ceramics, plastics and other substrates.

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 (when applied to a steel substrate), according to the authors.

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

The smoothness of the coating was determined by the degree of roughness.

The wear resistance of the sample coating, mounted at 45owas determined by the number of abrasive material silicon carbide (l) used for the abrasion of the coating to the substrate, in terms of unit thickness (μm).

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

As follows from the data presented in the table, based coating composition obtained by the proposed method, in comparison with a coating composition obtained by the method of the prototype environments.

In addition, the composition obtained proposed method is environmentally friendly and can be applied on various substrates: metal, concrete, ceramics, plastics and others.

A method of obtaining a protective composition for tubes by mixing preheated epoxy resin, plasticizer, thixotropic agent, a pigment and the introduction before applying curing agent, wherein the first mixed epoxy resin of molecular weight 390 - 430 with epoxy resin of molecular weight 1800 - 2300 in the presence of a copolymer of butyl methacrylate, methyl methacrylate and methacryloyl acid number of 1 to 3% by weight epoxy resins within 2 to 6 hours at a temperature of 80 - 100oC, and then cooled to 20 2oC the mixture was added with stirring, a plasticizer, a thixotropic agent, a pigment and is dispersed.

 

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