Anti-corrosion composition

FIELD: chemistry.

SUBSTANCE: composition contains epoxy-diane resin modified with copolymer of styrene, methylmethacrylate and methacrylic acid BMS-86, dioctylephthalate, wollastonite and microcalcite, technical carbon, polyethylene polyamine and organic solvent.

EFFECT: coating has high adhesion to metal surfaces 93-97 N/cm, high shear strength 183-189 N/cm and high water-absorption 1,75 - 2% at 20°C.

2 tbl, 3 ex

 

The invention relates to an anticorrosive compositions and can be used for corrosion protection of pipelines for various purposes, and also for protection of steel surfaces, operating in conditions of exposure to petroleum products, fresh and sea water.

Anticorrosive compositions prepared on the basis of natural or synthetic film-forming agents, pigments and fillers. Anti-corrosion agents, designed to protect metal pipes from harsh environments to ensure high adhesion to metal, is prepared on the basis of the film-forming possessing adhesive properties. In addition, recently there is a tendency to use fillers that improve not only the mechanical characteristics of the coatings, but also give the songs a special properties, for example, increase the abrasion resistance and adhesion of the film to the metal.

Known polymeric anticorrosion composition [1], containing in the composition of the epoxy resin (6,0-9.1 wt.%), oligomeric carboxylate rubber (35,0-38,0 wt.%), the polyethylenepolyamine of 7.0 to 8.0 wt.%), filler (2.0 to 4.0 wt.%), ethoxylated derivative of oleic acid (14,0-20,0 wt.%), water the rest.

The disadvantage of this composition is weak adhesion and high water absorption due to the presence in the composition compositionality water.

Also known composition for protective coatings containing epoxy resin, a modified silicon organic oligomer [2]. This composition has the following composition, wt.%:

Epoxy resin19-23
Organosilicon oligomer8,5-12
Carboxyl-containing curing agent18-21
Aluminum powder5-7
Ethylcellulose18-21
Toluenea 19.5-28

The disadvantage of this composition is that its use requires special preparation of the surface to be protected. In addition, the composition has a low temperature brittleness, resulting in even at +5°C protective coating cracks.

As the closest analogue is selected composition [3], which includes, parts by weight:

epoxy resin30,0-60,0
aminecontaining acrylic resin60,0-120,0
polyamines hardener15,0 and 15.3
pigments (titanium dioxide, carbon technical etc)22,0-136,0
fillers (talc, micro-talc, ground mica, wollastonite)57,0-150,0
organic solvent580,0-900,0

and can optionally contain a plasticizer is a mixture of dibutyl phthalate and tricresylphosphate in the amount of 4.4 and 8.1 parts by weight of

This composition provides coatings with high adhesion, hardness, elasticity, resistance to tearing, moisture resistance, resistance to temperature changes.

The proposed solution differs from the prototype with the exception of tricresylphosphate of the composition of the plasticizer, the use of dioctylphthalate instead dibutylphthalate while maintaining specified in the prototype technical result.

The wollastonite well dispersed in polar and nonpolar compounds and due to its morphology and other properties of the surface contributes to a better distribution of the other components of the full system. In addition, the introduction of wollastonite gives durability and padding materials. The wollastonite is a synergist p the interaction with anti-corrosive pigments and non-carcinogenic alternative to asbestos [4]. The use of wollastonite in a certain combination with technical carbon and microcalcite leads to increased strength, wear resistance, improved thermal insulation, refractory and technological properties.

Used as a modifier for epoxy acrylic copolymer leads to the formation of two-phase composition, which is characterized by high resistance under cyclic loading and, consequently, improved deformation-strength properties.

The components of the composition have the following ratio, wt.%

Epoxy resin ED-2031,5-35,5
Acrylic copolymerof 15.5-17.5
The dioctylphthalate2,5-3,5
The wollastonite7-9
Carbon7-9
Microsilica7-9
The polyethylenepolyamine2-3
Solventrest

The materials used in the composition of the proposed component is icii, easily accessible: produced on an industrial scale and regulated by the normative documents.

Deformation-strength properties of the coatings were tested by the method of uneven peeling them from the steel substrate steel Article 3 on a tensile testing machine R-5. The tensile strength of the composition when isolation was carried out as follows: two metal "fungus" was kicked between the test material and kept until it is fully dry. The sample was then stretched at a speed of 10 mm/min until rupture planes. Tensile strength at separation was calculated by dividing the maximum load by the contact area of the samples.

Determination of ultimate strength in shear was carried out as follows: two rectangular metal plates struck the primer and glue, and then the sample was mounted in the grips and stretched at a speed of 10 mm/min tensile strength shear was calculated by dividing the maximum load by the contact area of the samples.

Modification of epoxy acrylic copolymer in the ratio of 2:1 leads to an increase in tensile strength in two times in comparison with unmodified epoxy resin (tensile strength at separation is 24 N/cm). The introduction of wollastonite leads to a greater increase in tensile strength when you pull up to 100 N/cm, while the tensile strength at which the motor increases from 53 N/cm (unmodified unfilled resin) to 180 N/a see

A method of obtaining a corrosion-resistant material is provided in examples 1-3.

Example 1

Mixing was carried out in a laboratory mixer with a capacity of 0.5 liters, equipped with a stirrer. The number of revolutions of the stirrer was controlled using a rheostat. In order to achieve the required degree of milling of pigments and fillers injected beads - glass beads with a diameter of 1 mm.

At the first stage in the mixer was filled 26.5 wt.% the solvent was then loaded 15.5% of the sample mass of the acrylic copolymer included stirrer and portions were added to the epoxy resin in the amount of 33.5% of the sample mass. Was stirred for 15 minutes, after dissolution of the loaded components alternately portions were added to the pigment is carbon black in an amount of 7% of the sample mass and wollastonite fillers in an amount of 7% of the sample mass and microsilica in the amount of 7% by weight of the sample. The content was stirred for 15-20 minutes and then fell asleep beads and dispersively within 3-4 hours. 30 minutes before the end of the dispersion was added plasticizer dibutyl phthalate in an amount of 10% by weight of epoxy resin. After the primer was filtered from the beads and, immediately before analysis primer was added polyethylenepolyamine in the amount of 2 wt.%. Evaluated the quality of both the primer and coatings obtained on its basis.

Examples of 2 of the 3 have technology similar to example 1.

Table 1 shows examples of formulations of epoxy compositions for coatings, additionally shows the composition of the coating of the prototype. Table 2 shows the test results of properties of coatings of the compositions shown in table 1.

As can be seen from table 2, the proposed anti-corrosion material (examples 1-3) has a higher adhesion to the metal surface than the prototype, and therefore has a higher strength. In addition, the proposed anti-corrosion composition characterized by the fact that it consists of organic material, which meets modern requirements of environmental safety.

Table 1
The compositions of the epoxy composition for anti-corrosion coatings and the number of ingredients
Name ingredientsThe content of ingredients, wt.%
number of
123
Epoxy resin ED-2033,531,535.5
Acrylic copolymer BMS-8616,515,5of 17.5
The dioctylphthalate3,52,53,5
The wollastonite987
Carbon797
Microsilica798
The polyethylenepolyamine233
Toluenea 21.5a 21.518,5

Table 2
The results of the test coatings
IndicesExamples
12 3Requirements of the standard [5]
Viability, h77,57,5Not less than 1
Full cure at 20°C, d555No more than 7
Adhesion to the metal surface, determined by the method of normal rupture, N/cm979993At least 50
The strength of the coating shear, N/cm186189183At least 35
Water absorption at 20°C, %1,7521,9Not more than 5

Sources of information

1. Auth. mon. CCCPN 1348364.

2. Auth. mon. USSR N 1682370.

3. Patent RU 2335521 C1, 10.10.2008, 7 S.

4. Nazarenko CENTURIES Anisotropic silica fillers: special properties in paints and coatings. // Paint-and-lacquer materials and their application, No. 1-2, 2008-s-33.

5. TH IS T R 51164-98 steel pipe mains. General requirements for protection against corrosion.

Anticorrosive composition for protection of steel surfaces, including epoxy resin, a modified copolymer of styrene, methyl methacrylate and methacrylic acid BMS-86, the plasticizer is dioctylphthalate, fillers - wollastonite and microsilica, carbon black, curing agent - polyethylenimine, an organic solvent in the following ratio, wt.%:

epoxy resin ED-2031,5-35,5
specified acrylic copolymerof 15.5-17.5
the dioctylphthalate2,5-3,5
the wollastonite7-9
carbon7-9
microsilica7-9
the polyethylenepolyamine2-3
solventthe rest is up to 100



 

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