Protection of metal products against corrosion in climatic conditions of high humidity and aggressive environmental processes is one of the key issues in the production and operation of metal parts in heavy industry. Over the past decades, a traditional solution has been bitumen varnish and its use for short-term anti-corrosion protection of parts and assemblies during their operation, storage and transportation. However, due to the variety of recipes for the manufacture of bituminous paints and varnishes, over time, the scope of their use has expanded significantly up to the use of bitumen-based varnish in decorative work.
What is bituminous varnish, composition and classification
The main component of bituminous varnishes and paints is a solid substance - bitumen. Among its mechanical characteristics, one can single out the ability to soften and melt under the influence of temperature, in addition, they have the property of dissolving only under the influence of organic solvents. It can also contain corrosion inhibitors, antiseptics and other additives.
In the manufacture of varnishes, the following types of bitumen can be used:
- Created by nature (asphalts and asphaltites, which differ in their qualities depending on the place of extraction).
- Artificial (residual products of oil distillation, derivatives of cracking, oxidation).
- Coal, peat and woody pitches.
According to the chemical composition, paintwork materials containing bituminous materials are divided into:
- Oil-containing, which are subject to classification into oil-bitumen and oil-bitumen-resin (if there are glyphthal or rosin resin components in the formulation). By the number of oil components, greasy, medium and skinny varnishes are distinguished.
- Oil-free; solutions of bitumen and organic solvent with the inclusion (absence) of rosin in the composition (bituminous and bitumen-resinous).
- Coal - compounds of coal tar pitch and other bitumen in organic solvents.
Bituminous varnishes: application and properties
Oil-bituminous paintwork materials have high moisture resistance, weather resistance and electrical insulating properties. Varnishes without oil inclusions form a fusible water-resistant layer on the surface, however, at a low cost in production, they have a number of significant disadvantages - low lightfastness and heat resistance, low stability. The main color is black, shades are not subject to standardization.
Due to their properties, oil-bitumen coatings are used in the following cases:
- As an adhesive in the manufacture of mica tape.
- In electric motors for covering windings.
- In electrical engineering for the protection of assemblies and parts.
- In construction and repair work for protective coating metal pipesunderground, primed wooden products. For waterproofing various structures made of plastic, concrete, brick, wood (basements and others).
- Protection of battery assemblies from the action of sulfuric acid.
- As a coating for chemical equipment and metal structures.
- For gluing roll materials in roofing works (popular brand BT-123).
- For aging crafts in decoupage.
Bituminous varnish BT-577 specifications
Kuzbasslak is the most popular type of oil-free bitumen-containing coatings. The use of additives and driers in the recipe is allowed. The thinner can be White Spirit, turpentine. The main direction of use is the preservation of metals in the interoperative period of time, anti-corrosion protection during storage of metal products. The term of use of the protective film is up to 6 months. Suitable for use on wood substrates and other materials exposed to atmospheric conditions. The appearance of the coating is black gloss / semi-gloss, the shade is not standardized. On the basis of BT-577, when adding a suspension of aluminum powder, BT-177 paint (aluminum paint) is obtained.
The main specifications according to GOST 5631-79:
- The share of non-volatile substances is 39%.
- Viscosity at 20C, sec - 18-35 (VZ-4).
- Drying time - 24 hours at 20C, 20 minutes at 100-110C.
- Consumption per 1m2 - 100-120g.
Oil free quick dry bituminous varnish BT-5100 used to apply a protective film to the inner surfaces of metal parts.
Bituminous varnish in decoupage for aging crafts
It is used to create an aging effect and expressive volumetric relief on the surface of decorative items. It is achieved by lightening convex shapes and darkening depressions and microcracks. In most cases it is used as a top coat.
The varnish is applied with a flat brush, after which it is rubbed with a sponge or a piece of cloth and the excess is removed until the layer dries, adjusting the degree of darkening of the coating. After drying, the shade adjustment is possible with a cloth soaked in white spirit.
Before using bitumen-containing paints and varnishes, the working fluid should be thoroughly mixed until homogeneous throughout the volume. With increased viscosity, it is necessary to bring the varnish to the desired condition using thinners - white spirit, turpentine or other compatible solvent (depending on the brand of coating).
The surface to be painted must be dry, without dirt and dust deposits, easily peeling traces of the previous coating. Metal parts must be cleaned of traces of corrosion, if possible, treated with a rust modifier. The varnish is applied with a roller, brush or spray gun. With multi-layer staining, the interoperative drying interval takes at least 6 hours.
It is not recommended to use bituminous varnish inside residential premises; it is advisable to carry out painting work outdoors or in a well-ventilated area. It is fire hazardous, therefore it is strictly forbidden to work near open sources of fire and heating equipment with an open filament element. To avoid damage to the mucous membrane and skin, carry out the painting in protective clothing, using gloves and goggles.
Video: bituminous varnish for aging
Bitumast bitumen varnish receives positive feedback from consumers, traditionally high-quality products corresponding to the quality certificate at an affordable price are supplied by the manufacturer Yaskhim (bitumen varnish BT-577, known as Kuzbasslak). In most decoupage master classes, the Tair varnish is successfully used.
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Bituminous varnish BT-577 Kuzbasslak NBH provides a solution of bitumen in organic solvents with the introduction of synthetic modifying additives and a desiccant. BT-577 Kuzbasslak NBH is designed to protect the surfaces of metal structures and products in construction, mechanical engineering and other industries during their short storage and transportation (6 months in a temperate climate according to GOST 6992-68 for a single-layer coating), as well as for the manufacture of aluminum paint.
Bituminous varnish BT-577 is applied to the surface with a brush, paint spray, pouring or dipping. If necessary, the varnish is diluted to the working viscosity with white spirit, solvent, turpentine or a mixture of these solvents.
Precautions
When carrying out painting works, as well as after their completion, it is necessary to thoroughly ventilate the room. Use rubber gloves to protect your hands. Avoid ingestion and inhalation. In case of contact with varnish on the skin, rinse it warm water with soap. Keep out of the reach of children! Keep away from fire.
Bituminous varnish BT-577 must be stored in a dry, unheated room, in a tightly closed container, away from electrical appliances, food products, in places inaccessible to children, protect from moisture and direct sunlight, in a tightly closed container. The guaranteed shelf life is 6 months from the date of manufacture.
A type
Kuzbasslak.
Appointment
For temporary protection of surfaces of metal structures, products in construction, mechanical engineering and other industries during their short storage and transportation (up to 6 months in a temperate climate for a single-layer coating), as well as for the manufacture of BT-177 aluminum paint.
BT-577 Is a varnish based on a mixture of petroleum bitumen with organic solvents (a mixture of white spirit, solvent in a ratio of 1: 2), synthetic additives, a drier. The paint and varnish material is used to create a protective coating on metal. Also, BT-577 bitumen varnish is used as a basis for the production of aluminum paint (silver) BT-177.
This paint and varnish material can be used in mechanical engineering, construction and other sectors of the national economy. Bituminous varnish BT-577 effectively protects metal from rusting, in other words, corrosion, during transportation and short-term storage. Perfect for temporary protection of products.
After applying bituminous varnish, a glossy, even film is formed, uniform without mechanical impurities, wrinkles, pockmarks and other defects.
The color of BT-577 bitumen varnish is black, the shade is not regulated by GOST.
The lacquer manufacturing technology includes four stages:
Preparation of the varnish base;
Preparation of the varnish itself;
Mixer typing;
Cleaning in a centrifuge, filtration and filling into containers.
The base for BT-577 bitumen varnish is prepared in a reactor equipped with a system for blowing the composition with air (bubbler) and a propeller stirrer. The installation, strictly observing the sequence and proportions, is loaded with petroleum bitumen, asphaltite, prepared flax oil (amount - about 5%). The mass is melted at a temperature of about 120 ° C, then heated to 280 ° C and held until a sample on the glass indicates the homogeneity of the alloy. Air blowing contributes to the oxidation of the mixture and its cooling to a temperature of 105 - 115 ° С. Next, the varnish is pumped into the mixer, where it is thoroughly mixed and, using a diluent, is brought to the required viscosity (according to VZ-4, not less than 18s).
To apply varnish BT-577, a brush, roller or paint sprayer is used. In an industrial environment, painting can be done by dipping in a bath with paint and varnish material. This is especially true for small-sized parts and metal structures. Before application, varnish BT-577 is diluted to the required consistency using white spirit or nefras. You can also use a solvent, turpentine, or a mixture of both.
When painting, the consumption of BT-577 varnish is 100-200 grams per square meter, while the recommended number of layers is 1-2. The drying time of a single-layer protective coating at room temperature (+20 degrees Celsius) is 24 hours. If you use the hot drying method, in which the temperature is at least 100 degrees, the drying time to the third degree of hardness is reduced to twenty minutes - half an hour.
Based on the technical characteristics of BT-577 bitumen varnish, one can judge the special properties of this paint and varnish material. The composition is applied to a metal surface without preliminary treatment with primer paintwork. The protective film adheres firmly to the metal due to the good adhesion of the material to the base. This paintwork material provides effective temporary protection against corrosion in temperate climates, both indoors and outdoors.
The BT-577 bitumen varnish contains about 39% of non-volatile components (their mass fraction). The protective film is characterized by a fairly good heat resistance (withstands up to 200 ° C), elasticity - no more than 1 mm. The paintwork is resistant to short-term exposure to solutions of mineral salts. At an ambient temperature of about 20 ° C protective layer withstands at least 48 hours of static exposure to water.
When working with BT-577 varnish, it is important to remember about safety precautions, since such a solution is fire hazardous and toxic. Painting should be carried out in a well-ventilated area or outdoors, excluding the presence of open fire or the possibility of its occurrence. In the event of a fire, extinguishing agents can be: foam, sand, carbon dioxide, felts or water in a finely atomized state.
To protect the skin, the dye should wear protective clothing and protective gloves. It will not be superfluous to use glasses, a respirator mask.
Manufacturers of 577 bitumen varnish guarantee its quality for six months from the date of production, provided it is stored correctly, that is, in a closed sealed container in a dark, cool place.
BT-577 bituminous varnish is manufactured in accordance with GOST 5631-79.
Solutions of film-forming agents based on petroleum bitumen containing 40-48% of asphaltenes, carbenes and carbides, 15-18% resins, 34-50% mineral oils or coal tar pitch; film-forming solvents in bitumen varnish (Kuzbasslak) are turpentine, white spirit, oil or coal solvent, xylene; synthetic additives that improve the gloss of surfaces and accelerate the drying of kuzbasslak.
Bituminous varnish BT 577 characteristics
Bituminous varnish is frost-resistant. You can work and store Kuzbasslak at any temperature; in winter, in summer. The elasticity of the bitumen coating ensures the crack resistance of the bitumen varnish
Bituminous varnish BT 577 appointment
Kuzbasslak BT 577 is intended for temporary painting of metal products, keeps them from corrosion, pollution; keeps them beneficial features... Bituminous varnish BT 577 is used to create aluminum paints.
When using Kuzbasslak BT 577 GOST ensures the safety of metal structures during transportation; storage, preparing them for staining with long-term paints.
BT 577 is used to protect pipes, fences, fences, metal parts in the open air. In the future, paint can be applied to the bituminous varnish; BT 577 will provide excellent grip.
During the Great Patriotic War cannons, tanks, self-propelled guns, cars, the legendary Katyushas were painted with Kuzbasslak as a protective coating to prevent corrosion by rust. It firmly adhered to surfaces in contact with soil, grass, fallen trees and reliably protected the bottom of the equipment from corrosion.
kuzbasslak application:
Bituminous varnish BT 577 anti-corrosion treatment of cars
After winter, the subframe, axle, springs, earrings, etc. are often covered with red rust stains, and rust stains also appear on the bottom of the truck van. Of course, there is no threat to safe driving, but a rare driver likes to drive a car, the bottom of which is already reddening!
In this case, there is a Soviet proven technology: rinse everything, clean, clean, dry and close with Kuzbasslak.
BT 577 protection against decay
- "Kuzbasslak" is absolutely universal - it can cover not only metal surfaces, but also wood, slate, bricks, etc. It is very good to cover wooden posts with it to protect them from decay.
- Careful painting of a log with bitumen varnish is a guarantee of long service life, protection from wood decay. You can be sure that the fence will not lie down with rotted posts, but will stand for a long time and firmly.
- wooden crown at home treated with bitumen varnish is guaranteed to save you from the hassle and additional costs of partial or complete replacement of rotten logs in the future.
Warranty period 12 months from the date of manufacture.
Consumption of Kuzbasslak BT 577: 200 grams per square meter... Two coats recommended
Precautions:
When carrying out painting works, as well as after their completion, it is necessary to thoroughly ventilate the room. Use rubber gloves to protect your hands. Avoid ingestion and inhalation. If Kuzbasslak gets on your skin, wash it with warm water and soap.
Bituminous varnish BT 577 instructions for use
On the prepared surface, bitumen varnish is applied with a brush, spray gun, pouring or dipping. If necessary, diluted with white alcohol, solvent or turpentine, or their mixture. Drying time - 24 hours at a temperature of 20C; 20 minutes - at a temperature of 100C. The appearance of the coating is a glossy, uniform, even surface, without pockmarks and wrinkles.
Bituminous varnish BT 577 specifications
Conditional viscosity according to the VZ-4 viscometer at 20 ± 2 ° С, 18-35 sec
Mass fraction of non-volatile substances, 39 ± 2%
Time to dry degree 3:
At 20 ± 2 ° С, no more than 24 hours
At 100-110 ° С, no more than 20 min
Film hardness according to the pendulum device M-3, conventional units, not less than 0.20
Flexural elasticity of the film, no more than 1 mm
Film resistance to static impact of water at 20 ± 2 ° С, not less than 48 hours
Film resistance to static effect of 3% NaCl solution at 20 ± 2 ° С, 3 hours
Bituminous varnish BT 577 storage conditions
Varnish BT-577 must be stored in a dry, unheated room, in a tightly closed container.
Away from electrical appliances, food, in places inaccessible to children.
Kuzbasslak is protected from moisture, direct sunlight.
