Bitumen varnish is a chemical solution based on artificial or natural bitumen. If it is necessary to improve technical characteristics, then polymer resins, subdivided into natural and synthetic, are introduced into it. Then the resulting mixture is heated to a temperature of 280 ° C, then cooled to 170 ° C and organic solvents are added (white spirit, turpentine, solvent and others).
- Main characteristics
- Recommendations for working with bitumen varnish
- The properties
- Decoupage Application
- Popular types of varnishes BT
- BT-577
- BT-123
- BT-99
- BT-95
- BT-783
- Product Certification
- Safety precautions
Together with bitumen, oil can also be the basis. It can be linen or tung. Salts of fatty acids are introduced into such a composition.
to contents ↑Main characteristics
Bitumen is a liquid substance with an oily structure. It is either colorless or brown in color. When using it, care must be taken. Each of the following values depends on the composition of the substances used during the production of a certain type of paint product.
- drying time;
- viscosity;
- bending film elasticity;
- consumption per m2;
- resistance to high temperatures;
- moisture resistance;
- traction with metal.
The production of bitumen varnish is inexpensive. It is applied easily and simply. To do this, use a brush or roller. The degree of coverage is good. The resulting coating is smooth and without smudges.
Consumption depends on the material with which work is being conducted. For painting, an average of 100-200 ml of varnish per square meter is required. Areas of use:
- Painting of supports, plumbing, gates and other construction objects.
- Painting to prevent damage to equipment and structures during operation, transportation and storage.
Recommendations for working with bitumen varnish
Before use, bitumen-based varnish must be mixed thoroughly. In some cases, you need to add a little solvent. The area of intended application of the varnish should be clean and dried.
Everything that may interfere with painting should be erased or removed, for example, the remnants of the old coating, snow, ice, etc. Varnish is applied by roller, brush or sprayed in several layers. Each coat dries for about 7 hours.
to contents ↑The properties
Bitumen-based varnish is used to protect structures made of brick, wood, concrete from water. Therefore, it is widely used for long and reliable waterproofing of houses, basements, garages, pools and other structures. It is also possible to use as a decorative paint.
Varnish coating provides effective and reliable protection of metal from corrosion. A thin layer limits air and moisture. The process of iron oxidation does not occur.
Another important property is the high adhesion to most materials, in other words, one material can adhere to another. Firstly, it is being used as a primer for construction before applying paint, and secondly, as an adhesive for cold gluing roofing materials. This type of bonding is most appropriate, since the bitumen varnish can not be heated due to its fire hazard.
to contents ↑Decoupage Application
The decoupage effect is used to give an aged look to products, which will look appropriate in a certain interior style.Decoupage gives the product expressiveness and relief, an original look. You can get the desired result by darkening the pits and brightening the bulges. The designer also makes small cracks on the surface.
Bitumen varnish is usually used for aging. It is applied with a small brush, then with a rag or foam rubber sponge to eliminate leaks, excess, wipe until the coating dries. At the same time regulate the dimming and lightening in individual areas. Also, after complete drying, they give the final look to the decor, wiping in the right areas with white spirit for clarification. The excess is removed with a solvent.
If the surface is wooden, then the varnish penetrates into the cracks, emphasizing the structure of the tree. It is used for stucco decoration, furniture, bas-reliefs.
Drying requires 12 to 24 hours. The end result is fixed using alkaline varnish.
to contents ↑Popular types of varnishes BT
There are various brands of bitumen varnish, the most popular of them with application and characteristics are described below.
BT-577
Varnish BT-577 It contains oils, resins, solvents and a base - bitumen. The coating color is black with a beautiful sheen. This varnish is used for processing metal products, machinery and construction equipment, agricultural machinery. Often it is used for application on equipment that goes to the conservation stage. The same name paint is also prepared from BT-577 varnish, for which aluminum powder is introduced into it.
The material is applied by spraying, dipping, dipping, dyeing a roller. Drying time does not exceed 24 hours at room temperature, it is also permissible to use hot drying. The resulting coating is characterized by high strength, elasticity, water resistance, and resistance to salts, gasoline.
to contents ↑Attention! When working, it is important to be careful - bitumen varnish is fire hazardous and toxic to humans!
BT-123
Bitumen varnish BT-123 is widely used to protect metal objects from corrosion, as well as to protect non-metallic products during long-term storage and transportation in difficult conditions. In a temperate climate, varnish film retains its properties for six months.
Most often, the tool is used in roofing works, at other stages of construction.
Its main properties and characteristics:
- resistance to temperature extremes;
- resistance to moisture, a number of chemicals;
- increase the service life of products;
- strength;
- coating - glossy, transparent, without pockmarks, swelling;
- viscosity - 17–35 s according to the VZ-4 viscometer;
- solids content - 37%;
- coating drying - 24 hours at room temperature, 20 minutes - at +110 degrees;
- consumption - 80–110 g / sq. m
For dilution of the agent, standard solvents are used - white spirit, solvent. The surface is important to clean from rust, grease and dirt, and only then apply the material. It is best to use the pneumatic spray technique, but you can practice the filling method or paint with a brush. After the first coat is completely dry, a second coat can be applied if necessary.
to contents ↑BT-99
It is included in the list of impregnating electrical insulating paints and varnishes. The composition includes a solution of bitumen with alkyd oils, resins, as well as various additives and desiccants. It gives a beautiful black film on the surface of products; it is used to process the winding of electrical equipment. Before use, the product is diluted with toluene, solvent, and applied with a paint brush or dip the object in varnish.
BT-95
Material BT-95 is an adhesive oil-bitumen varnish, widely used in electrical insulation. For the manufacture of funds, varnish is combined with oils of vegetable origin. Solvents for the material - uyat spirit, xylene, solvent, or a mixture thereof.In addition to use for these purposes, the tool is used as an adhesive in the manufacture of mikalenta.
BT-783
Bitumen varnish BT-783 is a solution of petroleum bitumen on vegetable oils with the addition of desiccants, organic type solvents. Its purpose is specific - the material is used to cover the upper zone of the batteries, as well as their internal parts to protect against sulfuric acid.
As a result, a coating is created with the following properties:
- elasticity;
- strength;
- hardness;
- electrical strength;
- resistance to temperature extremes.
Apply the product by spraying, with a brush, and dilute with white spirit, xylene. Drying time is 24 hours, the temperature in the working area during application is + 5 ... + 35 degrees.
to contents ↑Product Certification
All varnishes can be divided into several large groups according to the type of solvent in the composition: oil, turpentine and alcohol. Each has its own functions and properties.
In our country, the presence of a certificate of conformity for varnish is recommendatory in nature. It is required only in rare rare cases. But all paints and varnishes must have a declaration of conformity. How do they differ? According to the certificate of conformity, responsibility for the information falls on both the certification body and the declarant. According to the declaration, only the certification body is responsible.
For varnish from bitumen, it is not necessary to issue a certificate of conformity for its release on sale in the Russian Federation. But this document is necessary if the products are involved in government tenders and transactions. It enhances the competitiveness of varnish in the market. State certification centers conduct tests in laboratories, on the basis of which a certificate is issued. The document must be prepared in advance.
to contents ↑Thanks to the certificate of conformity, confirming the high quality of the product, varnish is gaining great popularity among both ordinary customers and professionals.
Safety precautions
The substance under consideration is flammable, therefore, for proper operation with it, it is necessary:
- work in the fresh air or in a well-ventilated area;
- no smoking;
- do not work near sources of fire and heaters;
- wear a protective suit, glasses and gloves, avoid getting varnish on the skin, in the eyes and stomach.
If the substance gets on the skin, it must be washed off with soap and water and wiped dry. If in eyes, rinse with clean water and, if necessary, consult a doctor. If in the esophagus, do not self-medicate, but immediately consult a doctor and show him the label.
