Anticorrosion and heat-insulating coating based on hollow microspheres

FIELD: chemistry.

SUBSTANCE: invention relates to heat-insulating coatings. The anticorrosion and heat-insulating coating is made from a water-suspension composition with viscosity ranging from 1 to 100 Pa·s. The water-suspension composition contains a mixture of 5 to 95 vol. % polymer binder with 5 to 95 vol % hollow microspheres. The polymer binder is a water-emulsion polymer latex composition, which contains from 10 to 90 vol. % (co)polymer, selected from a group which includes acrylate homopolymer, styrene-acrylate copolymer, butadiene-styrene copolymer, polystyrene, butadiene polymer, polychlorovinyl polymer, polyurethane polymer, vinylacetate polymer or copolymer, or their mixture and from 10 to 90 vol % mixture of water and surface active substance. The hollow microspheres are in form of microspheres with different sizes from 10 to 500 micrometres and different packed density from 50 to 650 kg/m3, selected form a group which includes hollow glass microspheres, hollow ceramic microspheres, hollow polymer microspheres, hollow technogenic microspheres or their mixture. The water-suspension composition also contains a mixture of polyatomic alcohol with polybasic carboxylic or amino acid in equimolecular ratio.

EFFECT: longer service life of composition in harsh climatic and industrial conditions.

2 tbl, 1 ex

 

The invention relates to thermal insulation coatings, filled hollow spheres, for thermal insulation and corrosion protection of various surfaces, heat pipelines, oil and gas pipelines, ducts, ventilation and air conditioning, isolation tanks, industrial equipment, and housing, in housing and industrial construction.

Known fire retardant coating on a variety of surfaces, is made on the basis of the composition containing siloxane rubber, boron nitride, and as filler glass microspheres (patent RU №2039070 C1, CL C09D 183/04, C09D 5/18, B05D 1/38, publ. 09.07.1995 year). This coating has a weak adhesion (adhesion) with the surface to be coated finish material, as well as a low plasticity and, consequently, high brittleness, which dramatically reduces the durability of the coating.

Known to heat the substance to cover pipelines containing glass microspheres, plasticizer, epoxy and modified epoxy resin ED-20. (Application for a patent RU №93052300, publ. application 20.07.1996 year). From a technological point of view, the use of such a coating requires the preparation of a liquid mixture, a modified epoxy resin ED-20, glass microspheres, hardener - polyethylenepolyamine (PEPA), PL is tificate of polyisobutylene And-200 and other components immediately before use, because the mixture will harden quickly, not allowing to apply it to the surface. In addition, such a coating cannot withstand direct prolonged contact with water. The ability of the finished coating based on epoxy resin to plastic deformation is low, resulting in cracks in the pavement and its detachment from the stem after repeated cooling and heating in the winter and the summer.

Known composition containing ceramic microspheres or expanded perlite coated with a layer of polystyrene, as filler for cement or mixture of epoxy resins (US patent No. 4689358, 25.08.1987 year). In this case, the hardened coating has a sufficiently good heat-shielding layer, and it can prevent the heat flammable liquids (flammable liquids) during storage in pre-coated with such coating vessels, which leads to a lower probability of explosion or fire on the storage of flammable liquids. However, the use of such coatings is inconvenient from a technological point of view, since it is necessary to prepare a mixture of ceramic spheres with liquid basis directly before coating. In addition, the degree of corrosion protection in this case for the finished concrete surface is insufficient.

Known composition to obtain th the protective coating, containing filler, a polymeric binder, technological additive and water. As filler contains hollow ceramic microspheres with a specific gravity of 450-750 kg/m3, Mohs hardness of 5.0-6.0. As the polymer binder contains latex selected from the group comprising modified greeceitaly latex, 33-38%latex of copolymer of butadiene, Acrylonitrile and methacrylic acid, copolymer of styrene and n-butyl acrylate in a ratio of 1:1 by weight (patent RU No. 2311397 C2, publ. 27.11.2007).

However, the coating has a low level of adhesion required during operation to various kinds of surfaces.

Closest to the technical essence and the obtained result to the claimed invention is anticorrosion and thermal insulation coating made from a composition including a polymer binder and hollow microspheres. As the polymer binder composition contains a water-based polymer latex composition, as well as hollow microspheres is a mixture of hollow microspheres with different sizes and different bulk density (patent RU №2251563 C2, CL C09D 5/02, C09D 5/08, publ. 10.05.2005,).

Water-based polymer latex composition, filled with hollow microspheres, has low water absorption, high mechanical strength, but is different enough Vysokoye and weather resistance at normal temperatures, in extreme working temperatures, the coating does not provide the necessary level of thermal insulation and term health. When there are sharp differences of temperatures observed cracking of the material and, as a consequence, the loss of its functional purpose. The floor also has a low level of adhesion required during operation to various kinds of surfaces. This fact complicates the use of this coating in harsh climatic (at high temperature) industrial conditions (in the field of high temperatures) and reduces the uptime of the composition and reduce the scope.

The technical task of the invention is to increase uptime composition in hard climatic (at high temperature) and industrial conditions (in the field of high temperatures).

This technical problem is solved by the fact that anti-corrosion and thermal insulation coating made of a water-suspension of a composition with a viscosity of 1 to 100 PA·s, comprising a mixture of a polymeric binder 5-95% vol. the hollow microspheres of 5 to 95 vol.%. As the polymer binder composition contains a water-based polymer latex composition comprising from 10 to 90 vol.% (co) polymer. (Co) polymer selected from the group include what it homopolymer of acrylate, styrene-acrylate copolymer, butadiene-styrene copolymer, polystyrene, butadiene polymer, a polyvinyl chloride polymer, a polyurethane polymer, a polymer or copolymer of vinyl acetate, or mixtures thereof. Water-based polymer latex composition contains from 10 to 90 vol.% a mixture of water and surfactant. As hollow microspheres composition comprises microspheres of different sizes from 10 to 500 micrometers (μm) and different bulk density of from 50 to 650 kg/m3. Hollow microspheres selected from the group comprising hollow glass microspheres, hollow ceramic microspheres, hollow polymeric microspheres, hollow man-made (ash) microspheres, or a mixture thereof.

Water-suspension composition further comprises a mixture of a polyhydric alcohol with a polybasic carboxylic or amino acid in equimolecular ratio in the following ratio mixtures in aqueous suspension composition, parts by weight:

A mixture of a polymeric binder with hollow microspheres100
A mixture of a polyhydric alcohol with a polybasic
carboxylic or amino acid2-5

Polyhydric alcohol selected from a number of CH the ruts, glycerine, tetritol, pentitol, hexitol or pentaerythritol. Polybasic carboxylic acid selected from the group glutaric, oxalic, malonic, succinic acids. Amino acid selected from the group of tryptophan, valine, alanine, β-phenylalanine, aspartic acid.

In the process of mixing in equimolecular the ratio of polyhydric alcohol with polybasic carboxylic or amino acid and operation corrosion-resistant and heat-insulating coating is formed product interaction, the structure of which is determined by the structure of the original substances with high stabilization effect manifested when used in the composition of the water-suspension composition. This effect is due to the large size of macromolecules product interaction, which reduces the diffusion to the surface of the material, thus providing resistance to aging under heat and atmospheric effects. When using amino acids in the process of mixing and curing is increased stabilization properties of the product of interaction, caused by the large size of the macromolecules and the presence of amino groups, inhibiting the process of initiating radical processes, linking peroxide radicals, providing resistance to aging under heat and atmospheric effects, and due to the Oia high polarity provides increased adhesion strength.

Obtaining a mixture of a polyhydric alcohol with a polybasic carboxylic or amino acid in equimolecular ratio does not require complex chemical equipment, catalysts, high temperatures and pressures. The mixture has a high thermodynamic affinity with the polymer latex composition during storage is not coagulates, evenly distributed in the volume of the composition, extends the range of operating temperatures from -60°C to +260°C, thus ensuring high complex operational and technological characteristics, resulting in improved uptime composition in hard climatic (at high temperature) and industrial conditions (in the field of high temperatures).

The use of such compositions provide coatings on a variety of surfaces with good adhesion and mechanical properties, without the use of complex equipment.

The sample preparation.

Polymer latex mixture on the basis of styrene-acrylic latex was carefully peremesheno with glass microspheres of three types of sizes (average radii of the microspheres 35, 100 and 200 micrometers with facile densities 650, 150, 70 kg/m3in the ratio of 3:6:1, respectively), possibly titanium dioxide, surface-active additive, and cacheinvalidation rust. In the prepared water-suspension composition additionally introduced 2-5 parts by weight of a mixture of a polyhydric alcohol (ethylene glycol, glycerol) with polybasic carboxylic (glutaric, succinic acid) or amino acids (tryptophan, alanine) in equimolecular ratio. The prepared coating was applied on dry, clean and fat metal pipe heat supply, filled with superheated coolant temperature +135°C. the Prepared coating on the surface can be applied using brush, roller or airless spray gun successive thin layers (1 layer is not more than 0.4 mm). Time to complete drying of each layer at a temperature of 20°C - 24 hours, come-off - 15-20 minutes. Layer thickness of about 0.4 mm is equal to three "approaches" sprayer or brush. To achieve the desired reduction in temperature of the coated surface by applying an appropriate number of layers. Thus, it was applied five layers of coating with a total thickness of the finished layer is about 2 mm.

After application of the coating with a total thickness of 2 mm, the surface temperature of the pipe in the room with ambient temperature of 20°C was +135°C and decreased to +60°C in the presence of the premises weak airflow. The use of such compositions provide coatings on a variety of surfaces, possessing the x good adhesion and mechanical properties, without the use of complex equipment:

The elasticity of the film bending1 mm (GOST 6806-73)
Washability film0.6 g/m (GOST 28 196-89)
Resistance to
the influence of temperature
from -40°C to +160°Cunchanged (GOST 27037-86)

The basic properties of the proposed composition shown in table 1, 2.

Table 1
Technical characteristics of the proposed composition
IndexPolymer binder, hollow microspheresPolymer binder, hollow microspheres, a mixture of a polyhydric alcohol (ethylene glycol) with polybasic carboxylic (glutaric) acid in equimolecular ratioPolymer binder, hollow microspheres, a mixture of a polyhydric alcohol (ethylene glycol) with a polybasic amino acid (tryptophan) in equimolecular ratioPolymer binder, hollow microspheres, the mixture mnogovato the CSOs alcohol (glycerin) with polybasic carboxylic (succinic) acid in equimolecular ratio Polymer binder, hollow microspheres, a mixture of a polyhydric alcohol (glycerol) with polybasic amino acid (alanine) in equimolecular ratio
123456
Resistance to the effects of temperature from -40°C to +60°Cunchangedunchangedunchangedunchangedunchanged
Resistance to temperature +200°C for 1.5 hoursyellowing, cracking, peeling and bubblesYellowingunchangedyellowingunchanged
Elongation at break, %9,69,910,29,810,4

Table 1
Specifications proposed the first song (ending)
123456
Elongation at break after accelerated aging for 10 years, %8,28,99,19,009,2
Tensile strength:
after injury, MPa
2,01,71,61,71,8
- after accelerated aging 10 years, MPa3,02,62,52,72,5
Frost cover:
- 10 cycles - appearance
cracks, delamination, complete destruction coverCracksunchangedCracksunchanged
the adhesion of the coating to the concrete, MPa2,32,83,2 2,93,4

Anti-corrosion and thermal insulation coating made of a water-suspension of a composition with a viscosity of 1 to 100 PA·s, comprising a mixture of a polymeric binder 5-95% vol. the hollow microspheres of 5 to 95 vol.%, as the polymer binder composition contains a water-based polymer latex composition comprising from 10 to 90 vol.% (co) polymer selected from the group comprising, a homopolymer of acrylate, styrene-acrylate copolymer, butadiene-styrene copolymer, polystyrene, butadiene polymer, a polyvinyl chloride polymer, a polyurethane polymer, a polymer or copolymer of vinyl acetate, or mixtures thereof and from 10 to 90 vol.% a mixture of water and surfactant, as hollow microspheres composition comprises microspheres of different sizes from 10 to 500 micrometers (μm) and different bulk density of from 50 to 650 kg/m3selected from the group comprising hollow glass microspheres, hollow ceramic microspheres, hollow polymeric microspheres, hollow man-made (ash) microspheres, or mixtures thereof, characterized in that aqueous suspension composition further comprises a mixture of a polyhydric alcohol with a polybasic carboxylic or amino acid in equimolecular ratio in the following ratio mixtures in water-suspensio the Noah song parts by weight:

a mixture of a polymeric binder with hollow microspheres100
a mixture of a polyhydric alcohol with
polybasic carboxylic or amino acid2-5



 

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13 cl, 4 ex, 2 tbl

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