Composition for protective anticorrosive coating

FIELD: polymeric protective coatings.

SUBSTANCE: invention relates to compositions forming anticorrosive coatings on reinforced concrete, concrete, and bricks and which, in particular, can be employed for anticorrosive protection of concrete floors, large-size metallic containers, pipelines, brick basements, bottoms, cattle-breeding farms, open-type swimming pools, and also air conduits, piping, and other metallic structures in industrial buildings, and near production enterprises producing corrosive emissions into atmosphere. Coating according to invention is composed by copolymer obtained via copolymerization of vinyl ether with methyl methacrylate at weight ratio (3-6):1 in presence of azo-bis-isobutyronitrile followed by dissolution of copolymer in toluene. Vaporization of the latter leaves film protecting surface from destruction.

EFFECT: enhanced protection efficiency.

10 tbl

 

The invention relates to compositions for corrosion protection of concrete surfaces, multi-layer panels made of concrete, brick and plastered surfaces, floors in the stalls of animals under the influence of air and water corrosive environments.

Especially relevant task of creating a corrosion resistant coating for concrete and reinforced concrete structures, beams, floors in industrial enterprises, working with corrosive environments, as well as for waterproofing structures from aggressive treatment with pH≥6.

The most rational in this case are coatings based on polymeric binders, as they provide ease of application and durability of the coating.

Widely used as protective and anticorrosive tools, coatings based on acrylic polymers and epoxy resins.

Famous:

1 - Patent 94035362, class C 09 D 123/34, 157/02, 5/08.

2 - A.S. 1473326 (13) C, CL C 09 D 175/06, 5/08.

3 - Patent 94003348, class C 09 D 195/00.

4 - A.S. 1831871, CL 09 D 5/08, 127/18.

5 - A.S. 2010828, class C 09 D 195/00.

Corrosion-resistant coating based on methyl methacrylate, perchlorovinyl resin, polybutylmethacrylate and composition of sweet bitumen and epoxy for corrosion protection of reinforced concrete structures to protect pools, floors livestock complexes, as well as the Builder who's insulation materials.

Coatings based on sweet bitumen with a residual sulfur content of 0.3 to 0.6 wt.%, per 100 parts by weight of the original bitumen, 25-31% filler and epoxy resin 5-9 wt.%. The disadvantage of this coating is a low frost resistance, cracking under temperature extremes, high cost, increased difficulty in the coating, a high consumption of 500 g per 1 m2) and a curing time of about 2 hours.

Closest to the technical essence and the achieved result to the invention is a coating composition comprising methyl methacrylate, polybutylmethacrylate, polyisocyanate, hydrogen peroxide, perchlorovinyl resin, divinylbenzene, Amin, basalt scales [A.S. 1831871, class C 09 D 5/00, 127/48, 5/08. Efanova CENTURIES, males N], the composition is applied to a special device.

The composition has a complex composition, insufficient corrosion resistance, low resistance, long period of drying (curing) [10 days], dear filler - basalt scales and as a consequence an increased flow rate of 1 m2and high cost.

The technical object of the present invention is to improve the corrosion resistance, increase frost resistance, reduction of the drying period, the reduced flow of the coating of 1 m2and the simplification of the coating, reducing the cost of cover./p>

This technical result is achieved in that the coating composition as a binder contains a copolymer of methyl methacrylate with vinylmation ether, obtained by the copolymerization of methyl methacrylate with vinylmation ether in the presence of azobisisobutyronitrile, followed by dissolving the copolymer in toluene in the following ratio of components:

Copolymer of methyl methacrylate and vinylboronic ether 15-25 wt.%.

Toluene - rest.

The copolymer VBM receive joint copolymerization of methyl methacrylate with vinylmation ether at a ratio of 1:(3-6) concerns in the presence of azobisisobutyronitrile, followed by dissolving the copolymer in toluene.

The copolymer VBM receive joint copolymerization of methyl methacrylate with vinylmation ether at a ratio of 1:3 in the presence of a catalyst: azobisisobutyronitrile. After aging and Stripping unreacted monomers, the copolymer in the amount of 15-25 wt.% dissolved in toluene and Packed in containers. Analysis of the viscosity was carried out on the viscometer VZ-3.

Prepared toluene solution of the copolymer can be applied to concrete, brick, concrete surface by spray or brush. The drying period of 20-30 min, 15-25 wt.% toluene solution of the copolymer is transparent homogeneous liquid without mechanical impurities.

Coating n the concrete and brick was carried out by coating with a brush, with subsequent drying, and the metal tube by dipping in a solution.

The tests were carried out in the following environments:

- 3 wt.% an aqueous solution of NaOH,

- 3 wt.% an aqueous solution of N2SO4,

- Hosoda pH≥6÷8.

The thickness of the coating when the number of layers n=2 solution containing 15 wt.% copolymer EBM in toluene was equal 0,000078 m

The thickness of the coating when the number of layers n=2 solution with 25 wt.% copolymer in toluene was equal to 0.0001 M. Colorless to light yellow color. Viscosity of 40-60 cSt. The density of the film pendulum device M-3 0,5 conventional units.

The mass fraction is 15-25 wt.%. Has high adhesion to metal surfaces, concrete, concrete brick surfaces equal to 1-2 points. It is well to dissolve various pigments that gives cover any color.

Testing on samples covered with a solution of a copolymer EBM, was conducted by the gravimetric method according to GOST 7025-78. The coating on the concrete samples of size 70×70×70 mm and sample brick size 125×250×75 mm sample tubes 25×2,5, l=50 mm

The thickness of the coating when the number of layers n=3 to 15 wt.% the solution of copolymer in toluene - 0,00011 m

The thickness of the coating when the number of layers n=3 to 25 wt.% the solution of copolymer in toluene - 0,00017 m

For comparison, we took samples without coating and samples covered with a solution of the copolymer./p>

The disadvantages of the prototype are:

1. Low frost coating. The number of cycles of freezing the prototype - 30.

2. The hydrophilicity of the coating against moisture more than 3-4 times.

3. The period of drying in air for 10 days.

4. Curing is carried out only at room temperature for 3-4 hours.

5. The amino compounds (Amin, diethanolamine, dimethylamine) - hazardous substances with carcinogenic properties.

6. Because of the presence of basalt filler surface after the coating is rough and has a dark color.

7. Requires special devices for coating.

The advantages of the composition of the protective coating of reinforced concrete, concrete, brick, plastered surfaces compared with prototype:

1. Durability of concrete, brick, plastered surfaces, by coating increases by 5-6 points.

2. Frost coating 5-6 times higher than that of the prototype.

3. The moisture permeability of the coating 3-4 times less than that of the prototype.

4. The coating is resistant against aggressive environments with pH≥6.

5. Coverage at 1 m2less than 7-8 times.

6. The cost is lower than 5-6 times.

7. Technology coating is simple and can be arranged on any site.

Quantitative interval content of the copolymer EBM in toluene confirmation is by examples (PL. 1, 2, 5) and selected in the range of 15-25 wt.% and due to the fact that when the content of the copolymer of VBM in a solution of toluene less than 15 wt.% the amount of coating is less and the moisture permeability more, more corrosion. When the content of copolymer in toluene solution more than 25 wt.% it does not make sense, because the quality indicators are not improving, and coverage for 1 m2the surface is increased.

Table 1

The results of tests of 15-25 wt.% copolymer EBM in toluene at brick
The ratio of VBA:MMA weight. partsFrost resistance, cyclesThe period of drying, minThe adhesion score.Corrosion resistance point.WASTE
n=2n=3n=2n=3
1:1120252222MMA
2:1150262222VBA, MMA
3:1170281111-
4:117030 1111-
5:1170311111-
6:1170321111-
7:1170353322VBA

Table 2

The test results 15-25 wt.% copolymer EBM in toluene on concrete
The ratio of monomers in weight. partsFrost resistance, cyclesThe period of drying, minThe adhesion score.Corrosion resistance point.WASTE
n=2n=3n=2n=3
1:1120253322MMA
2:1150262222VBA, MMA
3:11702811 11-
4:1170301111-
5:1170311111-
6:1170321111-
7:1170351122VBA

Table 3

The change in mass of the samples from the length of stay in the alkaline environment of pH≥9
DaysSamples 3,

covered

covered

copolymer, g
Samples covered with a varnish, gSamples without coating, g
n=2n=3n=2n=3
797,568996,098297,790896,484895,1335
1497,600496,104697,829296,596695,1330
2197,581796,078897,899 96,543295,0936
2897,584596,077797,846796,548795,0668
3597,503596,070197,772496,496495,0234
4297,573196,065097,720896,464395,0578
4997,540196,049897,713596,463094,9230
13397,588596,1041peeling96,3045peeling

Table 4

The increase in moisture of the samples of concrete, covered with a solution of a copolymer VBM depending on the time trials
% moisture

Wednesday
The test time
5 days10 days15 days20 days
δ1δ2δinδ0δandδinδ0δandδinδsub> 0δandδin
Acid (2% H2SO4)-0,70,72-1,21,15-1,381,22-1,511,35
Alkaline (2% NaOH)2,10,170,113,00,230,15of 3.560,270,223,70,30,24
Neutral (water)1,950,120,113,00,230,15of 3.560,270,223,70,30,24
δ1that δ0Samples without coating;

δ2the sample is covered with two layers of a 15% solution of a copolymer with a thickness of 0,000078 m;

δinthe sample is covered with two layers of a 25% solution of a copolymer with a thickness of 0.0001 m;

δandthe sample is covered by three layers of a 25% solution of a copolymer with a thickness of 0,00017 m;

Table 5

The results of tests on samples of concrete, covered with a copolymer of VBM on water
τ, minThe mass of products, g
123
0102,75115,04103,63
15103,67115,17109,63
30104,58115,29110,08
60105,08115,35111,28
70105,87115,4111,22
80106,52115,45111,39
110107,68115,56111,32
800111,33116,42111,2
2700111,33116,45-
4200111,73116,63-
Samples:

1 - alkaline environment

2 - neutral environment

3 - acidic

Table 6

The test results of samples of brick, covered with a copolymer of VBM on water
τ, minThe mass of sample, g
123
without coating15,0214.4V14,72
015,2714,65-
1515,2814,8615,73
4515,3415,0215,85
6015,415,1315,86
8015,4715,2415,84
120the 15.615,3915,82
160of 15.7515,56-
20016,0215,81-
31516,4215,91-
144016,6116,02-
Samples:

1 - neutral environment

2 - the alkaline medium

3 - acidic

Table 7

Corrosion protective coatings
The ratio of VBA:MMA, Vestas.The amount of copolymer in toluene, wt.%Score for corrosionScore for corrosionThe number of layers
alkaline environmentneutral with the food
1:115222
3:115222
3:215222
1:315222
5:115222
1:125222
3:125222
3:225222
1:325222
5:125222

To study the properties of compositions prepared copolymer at various ratios.

The original monomers of vinylboronic ether (VBE) and methyl methacrylate (MMA), and then he in a predetermined amount were dissolved in toluene, ie,

The copolymer of vinylboronic ether and methyl methacrylate- 25 wt.%
Toluene- rest

As the table shows, the quality of the coating is not the power is on, since the copolymer is obtained for any value of the initial monomers, and then takes the specified amount of dry copolymer is dissolved in toluene.

Table 8

Frost resistance anti-corrosion protective coating
The ratio of VBA:MMA, Vestas.The amount of copolymer in toluene, wt.%The number of layersFrost, the number of cycles
1:115,02120
3:115,02170
3:215,0290
1:315,0270
5:115,02170
1:125,02120
3:125,02170
3:225,0290
1:325,0270
25,0170

Table 9

Adhesion of the film of the protective coating
Ratio

VBA:MMA,

Vestas.
Number

copolymer in toluene, wt.%
The number of layersAdhesion,

points
1:11423
1523
2022
2522
3022
3:11423
1522
2022
2521
3021
5:11423
1522
2022
2521
3021
1:31423
152 2
2022
2521
3021

Table 10

The change in mass of the samples from the length of stay in water pH 7
DaysSamples 3 floor copolymer, gSamples of 3 lacquered prototype, gSamples 3 uncoated, g
n=2n=3p=2n=3
795,379598,479396,370099,484695,6761
1495,391598,523396,372399,498895,5934
2195,333598,494196,344199,480495,4715
2895,320098,477996,336299,487795,4446
3595,263998,414996,283399,445395,3733
4295,244498,387596,239699,4494 95,2335
4995,189798,371996,217499,447495,1796
14794,958798,2309peeling film99,3561peeling film

Composition for protective anti-corrosion coatings reinforced concrete, concrete, brick, plastered surfaces, floors, farms, pools, based on the binder, which binder contains a copolymer of methyl methacrylate with vinylmation ether, obtained by the copolymerization of vinylboronic ether and methyl methacrylate at a mass ratio of 3-6:1 parts in the presence of azobisisobutyronitrile, followed by dissolving it in toluene at a ratio of components of the composition, wt.%:

The specified copolymer15-25
TolueneRest



 

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