Polyurethane enamel: description, characteristics, types, application

To protect the surfaces from negative influences, including atmospheric ones, polyurethane enamel is actively used today, 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 paints, then with the 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.

Classification of polyurethane enamels

Polyurethane mixtures are classified according to the material to be coated, as well as the type of application and composition. Use a brush or a special aerosol dispenser for application. The area of use of polyurethane enamel is wide enough, different types can be applied on stone, wood or metal. Before using the polyurethane mixture, the wood does not need to be primed, it must only be dried well.

Specifications

Polyurethane one-component enamel is a composition that is made of polyurethane, pigment and solvent. Among the main characteristics of this mixture should be:

• Durability;
• elasticity;
• Harmless after evaporation of the solvent;
• Chemical stability.

Polyurethane compounds perfectly adhere to the most complex surfaces.

Varieties of polyurethane enamels

Polyurethane enamel can be 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 represented by a unique chemical 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 paint the floor in the production room, it is recommended to give preference to the composition with organic solvents.

Polyurethane enamel on organic solvents

Polyurethane enamel can be made on the basis of organic 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 alkyd-urethane, they are used to create an elastic and durable coating that slowly hardens, and also has a mild odor when staining. The price for such mixtures is significantly lower compared to single-component urethane enamels.

Description of two-component polyurethane enamels

Enamel polyurethane two-component consists of hardener 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.

The upper limit of the working temperature of this mixture 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.

The use of polyurethane enamel "Elakor-PU"

If you need primer-polyurethane enamel, pay attention to "Elakor-PU", whose cost per kilogram is 275 rubles. Apply this compound should under certain conditions, which are expressed in the absence of capillary rise of water from below. It is also important to have a waterproofing base. 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 remains of old paint, dirt and cement milk.

Before using polyurethane enamel for 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.

Application of enamel for concrete "Elakor-PU Emal-60"

This enamel is a one-component colored moisture-curing semigloss mixture, as 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 priming the surface, which is then covered with enamel at a temperature from -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 until uniform in 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 work, you can use rollers or 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.

Conclusion

If you decide to use a two-component polyurethane compound, you should consider 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.