To protect surfaces from negativeeffects, including atmospheric, today the polyurethane enamel is actively used, which is offered for sale in a wide range. This mixture is a variety of polymers that have protective properties. If you compare this composition with other colors, then with polyurethane enamel is not able to compare any other option. Quite often, this composition is used as a protective coating, since the film has a high margin of safety.
Полиуретановые смеси подразделяются по материалу, which must be coated, as well as the type of application and composition. Use for brushing can be a brush or a special aerosol dispenser. The field of use of polyurethane enamel is wide enough, different types can be applied on a stone, wood or metal. Before using the polyurethane mixture, the wood should not be primed, it should only be dried well.
Polyurethane one-component enamel is a compound that is made of polyurethane, pigment and solvent. Among the main characteristics of this mixture should be:
Polyurethane compounds perfectly adhere to the most complex surfaces.
Полиуретановая эмаль может быть water-dispersive. Among the advantages are the harmlessness at the staining stage and the possibility of dilution with ordinary water. Hydrophobic surfaces such enamels to dye is not recommended. This should include concrete, stainless steel and plastic.
Polyurethane is presented by a unique chemicalA modification that allows the composition to be stored as an aqueous non-curing dispersion. This allows a durable, wear-resistant coating. If it is necessary to color the floor in the production room, it is recommended to give preference to the composition with organic solvents.
Polyurethane enamel can be made on the basis oforganic solvents, for example, xylene or toluene. For dilution, it is better to use numbered solvents, which are recommended by the manufacturer. After a set of strength, which takes two days, this coating acquires qualities called the main advantages: durability, water resistance, resistance to aggressive environments.
Polyurethane enamel paints are still availablealkyd urethane, they are used to create an elastic and durable coating that slowly solidifies, and also has a mild odor when staining. The price for such mixtures is significantly lower compared with single-component urethane enamels.
Enamel polyurethane two-component consists ofhardener and enamel, the first of which is added before use. The mixture remains viable for 3 hours, and the drying lasts 6 hours. The cost of this material is high, as is the strength of the coating. Such polyurethane enamel for metal can be used for metal structures, which will be loaded in production conditions and operated in hot shops with an aggressive atmosphere.
Верхний предел рабочей температуры данной смеси is +80 ° C and can reach 100 ° C. If there is a need to cover the structure, which will be used in fire-hazardous conditions, then you should get special compounds. For example, the paint on metal "Polystyl" under the influence of temperature will form carbon foam, which reliably insulates and resists the flame up to 1.5 hours.
If you need a primer-enamel polyurethane,pay attention to "Elakor-PU", the cost of which per kilogram is 275 rubles. This composition should be used under certain conditions, which are expressed in the absence of capillary rise of water from below. It is also important that the base is waterproofed. The residual surface moisture should not exceed 5%. Before applying the composition, the surface gets rid of oily areas. If it is a concrete base, then it should be sanded using a special machine to remove the remnants of the old paint, contaminants and cement milks.
Before using polyurethane enamelfor concrete, the surface must be dusted with an industrial vacuum cleaner, and then covered with a primer from the same manufacturer. Before use, the mixture is well mixed, and it must be applied with a polyamide roller in 4 layers. The minimum number of layers is 2, a finite number will depend on the task being pursued. Between layers, wait about 4-8 hours.
This enamel is a one-componentcolor moisture-curing semigloss mixture, the main advantage of which is the possibility of application at negative temperatures. After polymerization, a wear-resistant hard plastic polymer forms on the surface, which will be chemically stable.
Preparation consists in cleaning and primingsurface, which is then covered with enamel at a temperature of -30 to +25 ° C. The temperature of the material itself can vary from +10 to +25 ° C. It is important to take into account also the relative humidity of the air, it should not exceed 80%. Prior to application, the formulation is mixed to a uniform color and consistency. To do this, you can use a mixer for paints, which is set to a speed in the range of 400 to 600 per minute.
For the work you can use rollersor brushes that are resistant to solvents. Airless spray technology can be applied. One layer, the area of which is a square meter, will take approximately 150 grams of enamel. The final result will depend on the smoothness of the surface. The layer-by-layer drying lasts the same amount of time as in the above-described variant.
If you decide to use a two-componentpolyurethane composition, it must be taken into account that its application is not carried out on wet surfaces. This requirement is due to the fact that the hardener will react with the liquid by the release of carbon dioxide, which promotes foaming of the surface.
