Polyurethane coating

FIELD: chemistry.

SUBSTANCE: polyurethane coating is made from a composition which contains refined castor oil, an ester, an antifoaming additive BYK-066 based on fluorine-modified polysiloxanes, aluminium oxide, titanium oxide, aerosil, a water adsorbent, an additive BYK-410 - urea in an organic solvent N-methylpyrrolidone, a curing agent isocyanate SUPRASEK 5025, which is 4,4'-diphenylmethane diisocyanate and additionally as filler - dolomite or zeolite or a mixture of dolomite and zeolite in ratio 3.25:1.

EFFECT: coating has high breaking strength and modulus of elasticity in tension, while providing sufficiently high deformation characteristics, particularly tensile elongation.

2 tbl

 

The invention relates to two-component polyurethane composition intended for the installation and repair of self-leveling seamless wear-resistant coatings on concrete base.

Polyurethane coatings have several advantages over other types of coatings: elasticity, excellent appearance and diversity of design solutions. When applied on concrete base polymer coating helps to increase load-carrying capacity and durability of building structures. Coating of polyurethane compositions are seamless solid membrane of a thickness not exceeding 2 mm and survive at ambient temperatures from -60 to +80°C at a relative humidity environment (95±3) %. Optionally, the composition can be painted in any color special pigment pastes, not containing in the composition of the hydroxyl-containing compounds and water.

The closest analogue is industrially manufactured polyurethane composition Soveral 05 (TU 5772-001-99477769-2007), consisting of component a and component B. Component a is a complex multifunctional aromatic polyesters with fillers, pigments, functional additives, component B - hardener isocyanate SUPRASEK 5025 (4,4'-diphenylmethanediisocyanate). When interacting components a and B ducommon ntih systems is the reaction of polymerization.

Known polyurethane composition has good technological parameters (viscosity, pot life, curing time), but is characterized by a high enough uprugoopticheskii performance.

The technical result is to increase the tensile strength and elastic modulus polyurethane coatings under tension while ensuring sufficiently high deformation characteristics, in particular relative elongation under tension.

The technical result is achieved in that the polyurethane coating made from the composition containing castor oil refined, sophisticated polyester, defoaming additive BYK-066-based thermodiffusion polysiloxanes, aluminum oxide, titanium oxide, Aerosil, adsorbent water additive BYK-410 - urea in an organic solvent N-methylpyrrolidone, hardener isocyanate SUPRASEK 5025, represents 4,4'-diphenylmethanediisocyanate additionally contains as filler dolomite or zeolite, or a mixture of zootoxins of 3.25:1 in the following ratio, wt.%:

Castor oil refined25,76-28,23
Complex polyester12,88-14,12
Defoaming additive BYK-0660,3-0,31
Aluminium oxide14-40
Dolomite or zeolite or a mixture in the ratio
of 3.25:17-21
The titanium oxide0,7-0,8
Aerosil0,35-0,4
The adsorbent watera 1.75-2
Additive BYK-4100,3-0,31
Hardener isocyanate SUPRASEK 502517,55-19,25

Castor oil refined is a transparent oily liquid light yellow color, completely soluble in an equal volume of 96% ethanol and has the following physico-technical specifications: acid value - not more than 1.6 KOH/g for first grade, not more than 3 KOH/g for the second grade; the color number is not more than 20 mg of iodine for first grade, 30 mg of iodine for the second grade; density at 20°C - 0,947-0,970 g/cm3; mass fraction of moisture and volatile matter not more than 0.15% for the first grade of 0.25% for class II; viscosity at 20°C 200-250; a pour point of minus 16°C; mass is th fraction of ash - no more than 0,008 for first grade, not more than 0.02 for the second grade; mass fraction of unsaponifiable matter - not more than 1%; the flash point of oil extraction in a closed crucible - not less than 240°C.

Defoaming additive BYK-066 is thermodiffusion polysiloxane with a wide range of use, density at 20°C - 81 g/ml, the mass fraction of solids - 0,7%, flashpoint - 47°C.

Aluminium oxide Al2O3represents the granules of cylindrical shape, white; diameter of 5.0 mm±1.0 mm, length 18 mm; bulk density - 450-550 g/DM3; specific surface area not less than 200 m2/g; mass fraction of combustion loss is not more than 5%mass fraction of iron is not more than 0.05%; mass fraction of sodium - no more than 0,03%; mass fraction of dust and fines of size 2 mm - not more than 0.5%.

The titanium oxide Tio2is a synthetic inorganic white pigment, anatase and rutile forms, obtained by hydrolysis of solutions of sulphuric acid titanium and calcining the hydrated titanium dioxide.

Aerosil is a pure silicon dioxide SiO2could be a loose bluish-white powder (loose form) and the white mass in the form of loose pieces (in aggregated form).

Dolomite is a mineral from the group of carbonates, widespread on the territorie of the Republic of Mordovia. The chemical composition is a double carbonate of calcium and magnesium: CaMg[CO3]2color grayish white, sometimes yellowish, brownish or greenish shades. Hardness on the mineralogical scale is 3.5-4; density 2800-2900 kg/m3.

Zeolite is a large group of aqueous silicates with cations of potassium, sodium, calcium and magnesium.

Complex polyester Sovermol 815 is an oily liquid light yellow color.

The water adsorbent FINMA-SORB 430 is a white powder, refers to molecular sieves based on aluminosilicates of alkali metals (manufacturer BayerInternationalS.a.").

Additive BYK-410 - urea in an organic solvent N-methylpyrrolidone derived from ammonia and carbon dioxide is a white powder and is used as an additive that prevents settling.

Hardener isocyanate SUPRASEK 5025, represents 4,4'-diphenylmethanediisocyanate is homogeneous liquid from dark yellow to dark-brown, the density of the composition is 1.25 kg/m3, viscosity by viscometer VZ-246 or VZ-4 with the nozzle diameter of 4 mm - 110 C, the mass fraction isocyanate groups of at least 30.5 per cent, the viability of the composition is not less than 60 minutes

Technological process of manufacture of two-component composition consists of two phases: a sentence is Olenye component and connect it with component B.

A method of manufacturing the component was as follows. In the mixer with the mixer load castor oil refined, sophisticated polyester, defoaming additive BYK-066 and stirred for 1 minute. Then when running the mixer to the resulting composition add alternately the target additives: organic fillers (dolomite or zeolite or a mixture in a ratio of 3.25:1), pre-dried, crushed and sieved through a sieve with a mesh size of 0.16 mm; aluminum oxide, titanium oxide, Aerosil, the adsorbent of water and dispersed, mixing until smooth for about 20 minutes.

In the finished component And enter the hardener component B isocyanate SUPRASEK 5025 and stirred for 3 minutes.

The compositions of the polyurethane compositions and the results of tests on the properties of the proposed coatings are shown in tables 1 and 2. Defining properties of polyurethane coatings was performed according to the normative-technical documentation: viscosity of the finished composition was determined according to GOST 9070-75*, ultimate tensile strength according to GOST 11262-80*, modulus of tensile elasticity according to GOST 9550-81, length of charred parts according to GOST 21207-81.

Compared with the known solution proposed composition of the polyurethane coating has a lower cost due to the replacement of expensive imported filler of alumina mistimes of the Republic of Mordovia materials and higher uprugoopticheskii indicators. The level of fire safety polyurethane composition does not exceed control values (25 mm), and for some compositions the length of the charred portion is lower than that of the prototype.

Table 1
Name of the componentComposition
1234
12345
Component a
Binder:
- castor oil refined28,2328,2328,2325,75
- complex polyester14,1214,1214,1212,88
Defoaming additive BYK-066-based thermodiffusion policy xanav 0,30,30,30,31
Fillers:
- aluminium oxide142823,126,4
- dolomite or zeolite or a mixture in a ratio of 3.25:121711,913,6
Pigment:
- titanium oxide
0,70,70,70,8
Thixotropic additive:
- Aerosil
0,350,350,350,4
The adsorbent water1,751,751,752
Additive that prevents subsidence:
- BYK-410 - urea in an organic solvent N-methylpyrrolidone
0,30,30,31
Component B
Hardener isocyanate SUPRASEK 5025 4,4'-diphenylmethanediisocyanate19,2519,2519,2517,55

Table 2
Properties offer polyurethane coatings
Features
1234
Component a
Appearance (without pigment)Homogenous suspension from white to yellowish color
The density of the composition, kg/m3not less than1150
Viscosity by viscometer VZ-246 or VZ-4 with the nozzle diameter of 4 mm at a temperature of (20±0,5)°C, with250 - 400
With the actual content of dry matter, per cent, not less than100
Component B
AppearanceHomogeneous liquid from dark yellow to dark brown
The density of the composition, kg/m31,25
Viscosity by viscometer VZ-246 or VZ-4 with the nozzle diameter of 4 mm at a temperature of (20±0,5)°C, with50-110
Mass fraction isocyanate groups, %, not less than30,5
The viability of the song, min, not less than60
Cured films
Ultimate tensile strength, MPa7,665,857,477,45
Elongation at elongation, %35,2534,1736,9634,13
The modulus of tensile elasticity, MPa 45,4028,52of 46.68of 45.42
The length of the charred parts, mm, not more than 25 mm14,7016,1020,3714,73
Water absorption for 24 hours, %, max4
The curing time of the film, h, max12

Polyurethane coating made from the composition containing castor oil refined, sophisticated polyester, defoaming additive BYK-066-based thermodiffusion polysiloxanes, aluminum oxide, titanium oxide, Aerosil, adsorbent water additive BYK-410 - urea in an organic solvent N-organic, hardener isocyanate SUPRASEK 5025, represents 4,4'-diphenylmethanediisocyanate, characterized in that the composition additionally contains as filler dolomite, or zeolite, or a mixture in a ratio of 3.25:1 in the following ratio, wt.%:

Castor oil refined25,75-28,23
Complex polyester 12,88-14,12
Defoaming additive BYK-0660,3-0,31
Aluminium oxide14-40
Dolomite, or zeolite, or a mixture in
the ratio of 3.25:17-21
The titanium oxide0,7-0,8
Aerosil0,35-0,4
The adsorbent watera 1.75-2
Additive BYK-4100,3-0,31
Isocyanate SUPRASEK 502517,55-19,25



 

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