Primer concrete contact GOST 28196 89 technical characteristics

Betonokontakt (concrete contact) is a universal water-dispersible acrylic primer on a polymer base. It is produced in accordance with GOST R 52020-2003. The primer mixture can be used both indoors and outdoors. Contact concrete applied to the working surface forms a smooth, almost colorless film. Sometimes the film has a slightly visible whitish tint. The primer is resistant to alkaline materials.

You can buy concrete contact in a 20 kg bucket, barrels or other containers with delivery throughout Russia.

Definition and composition

Concrete contact is a cement-polymer primer for concrete coatings that increases the adhesion of the base and coating materials.

The working solution includes:

• Polymer (mostly acrylic);
• Portland cement;
• Quartz sand and mineral chips;
• Additives (water resistance, frost resistance).

Concrete contact soil lays on the walls, floor and ceiling with a thin film, forming a rough surface. The solution penetrates into microcracks, adhesion to smooth areas is ensured by the polymer filler. To improve the adhesion of materials, mineral chips and sand of different fractions are introduced into the concrete contact composition in an amount of at least 30% of the total volume. Some manufacturers increase the filler content, but this is not necessary or appropriate for every finishing job.

Concrete contact

The components that make up the concrete contact deep penetration primer (acrylic compounds, cement and sand) make it possible to easily create excellent adhesion on the surface due to the roughness of the structure, similar in appearance and properties to sandpaper.

Using concrete contact primer for walls when carrying out finishing activities, you can combine almost different materials, which makes it possible to create a unique, original design on walls and ceilings. Moreover, according to experts, the material adheres firmly to surfaces for quite a long time. Acrylic Betocontact primer can be applied to almost any surface: concrete pavement, tiles, metal surfaces, wood, brickwork, painted surfaces, etc.

Primer manufacturers

In our company you can get free advice on the choice of finishing materials and buy concrete contact primer in Moscow from both domestic and foreign manufacturers of the following brands:

• Finishing mixture – Knauf concrete contact primer. Its components include quartz sand, which forms roughness on the surface when processing concrete and other coatings. The consumption of concrete contact primer per 1 m2 is no more than 240-340 g/m2.
• The primer composition concrete contact ceresite has a density of 1.8 kg/m3 and environmentally friendly properties, used for interior decoration. How much does concrete contact cost? The cost of concrete contact primer is significantly lower than that of Knauf.
• The prospector primer mixture is used in addition to concrete surfaces, also for application with a roller or brush on gas silicate blocks, without additional processing.
• Acrylic primer liquid Acrylic primer. This material can be used to process both external and internal surfaces; when using it, you can lay a new layer of ceramic tiles directly on top of the old one. This brand of concrete contact primer has a consumption of 290-310 g/m2.

The basis of any composition of these materials is quartz sand, which differs in structure from different manufacturers; some add needle quartz to increase adhesion.

Primer technical specifications

The use of such a material makes it possible to create roughness on almost different smooth surfaces to increase adhesion. The main advantages of the soil include:

Concrete contact application

• Accelerated drying process for coated surfaces. After 2-3 hours have passed after coating with the primer mixture, you can safely begin the next work process.
• Increased moisture resistance. After applying the primer, a film is formed on the treated areas that does not allow moisture to pass through; thanks to these properties, the composition can be used for waterproofing when making cement screed for the floor.
• The material has a long service life; the manufacturer guarantees that the properties and characteristics of the soil will not change for 80 years.
• When adding colored preparations, it is possible to visually control the uniformity of primer application to the surface.
• Simplicity and convenience when covering areas both using mechanical devices and manually.
• These primer mixtures are safe for the human body and animals.
• Environmentally friendly, no pungent odor.
• They are highly resistant to the formation of fungi and mold.

Betonokontakt technical characteristics

This solution has the property of turning a smooth wall surface into a rough one and is classified as a primer. Due to the presence of quartz sand in the composition, concrete contact is capable of connecting almost any coating to the walls. Technical characteristics include:

• relatively high drying speed on walls. You can continue repairs within two hours after applying the solution;
• excellent moisture resistance. Concrete contact can be considered a waterproofing finish, because after drying, a waterproof film is formed on the surface of the walls;
• Due to protection from external damage, it can last for many years, which is a plus. The average lifespan is approximately sixty years;
• the consumption is not too high and on average you will need 290-390 grams of the mixture to treat one square meter of wall.

Thanks to these technical characteristics, concrete contact has gained wide popularity among both professionals and beginners in the construction business.

Why do you need concrete contact for interior work?

Among all the materials that are used to prepare surfaces for plastering or gluing tiles, concrete contact occupies a special place due to its versatility and unique adhesion - the ability to adhere to a wide variety of surfaces. With the help of this innovative primer, it is possible to carry out such complex connections of completely different materials as wood-glass, metal-tile and many others.

Such mixtures can be used when performing stages of work of any complexity, both during professional construction by experienced workers, and in domestic conditions for beginners during home renovations.

What is concrete contact?

Not everyone knows what it is. The popular concrete contact, the use of which ensures increased adhesion of finishing materials to walls and ceilings, is a special mixture for priming the surface being treated.

This primer is intended for surfaces that do not absorb moisture well.

The composition of concrete contact soil includes the following ingredients:

1. Portland cement.
2. Quartz sand.
3. Polymer filler.
4. Special additives.

Concrete contact is a polymer-based building mixture that is resistant to alkalis and increases the adhesion of the material to the base.

In online stores you are offered to purchase various brands of high-quality primers at a low cost with delivery or pickup. You can find out the cost of the product and order it on the company’s official website. Products are sold both wholesale and retail. Payment for the services provided is made in any way convenient for you.

When collaborating with our company, you have the opportunity to significantly save money and time while receiving high-quality products.

Characteristics

Concrete contact primer from any manufacturer is a material with similar properties, because the production of the material and quality control are carried out on the basis of GOST 28196-89 “Water-dispersion paints”.

Technical characteristics of concrete contact:

Concrete contact dries up to 2-4 hours, the speed depends on environmental conditions and characteristics of the composition. After this time, re-application or subsequent finishing can begin.

What not to do

Sometimes you can find reviews that plaster or some other type of finish does not adhere to the concrete contact. If everything is done correctly, this will not happen.

Also, do not apply the material to surfaces that are not intended for this purpose. In addition, you should not do the following:

• Don't add a lot of water to the mixture. Be sure to read the recommendations from the manufacturer, which will be indicated on the packaging of the material. Of course, it is much easier to work with a more liquid concrete contact, but in the end the primer may fall off.
• Do not apply the composition to substrates that are frozen.
• Do not apply to the surface if it has not been prepared. It is imperative to remove all those parts that are crumbling, degrease and remove dust and dirt.
• Concrete contact should not be applied to wet surfaces.
• When using the composition, it must be stirred from time to time so that sand particles do not settle to the bottom.
• Do not work until the applied primer layer is completely dry. Further finishing is possible only after the concrete contact is completely dry, but no more than a day will pass after its application.
• Work cannot be performed if the air temperature is below five degrees. Of course, this does not mean that the material is not suitable for outdoor work, but it is still better to wait until it gets warmer outside.
• Every effort must be made to ensure that dust does not fall on the treated surface. The layer is quite sticky and therefore the dust sticks well, but it may soon fall off along with the primer. In the event that dust does get on the walls, then it is necessary to apply another layer of concrete contact.
• You cannot use mixtures that have expired or that have been stored at low temperatures, with the exception of frost-resistant compositions.
• Even if the composition seems very thick, you should not add water to it. This can only be done if the manufacturer has indicated this option on the packaging.

It is also very important to purchase really high-quality concrete contacts. This is the most important condition for the material to adhere well to the surface of the walls and be able to cope with the assigned tasks.

Varieties

Primer for concrete and smooth non-absorbent surfaces is divided into 2 types:

• concrete contact for external work;
• for interior work;
• universal.

The soil for outdoor work is predominantly frost-resistant, able to withstand winter frosts and atmospheric influences (humidity, temperature changes, solar UV rays). Concrete contact for interior work is resistant to moisture and fungi, and forms an ideal surface for interior decoration.

The universal concrete primer is suitable for indoor and outdoor work and meets the requirements for indoor and outdoor use at the same time. This is convenient to purchase during construction, when there is a need for parallel or sequential cladding of rooms and facades.

Purpose

The main purpose for which concrete contact is needed is to create a relief surface for subsequent cladding with finishing materials - plasters, putties, masonry mortars for tiles. It must be used to process any smooth surfaces. In addition, it strengthens the base and extends its service life.

So, concrete contact is used:

• for treating walls and floors before plastering. The ceiling is covered with mortar only if heavy cladding is created (pasting or plastering). Before painting, a primer treatment is sufficient;
• for coating smooth cement plasters before facing;
• for preparing concrete and brick surfaces.

Instructions for using concrete contact

Working with polymer-sand primer for smooth surfaces is easy. For manual work you will need:

• ready-made concrete contact solution or dry mixture for self-preparation;
• roller with a long handle for covering walls or floors;
• wide brush for working corners;
• tray for rolling out the solution.

For faster work, the only tools you need are a spray gun.

Stage 1: preparation

For new surfaces, removing traces of formwork and degreasing is sufficient if lubricants were used to remove the form. It is also necessary to get rid of traces of bitumen and dust deposits.

To work with indoor concrete contact, it is necessary to create optimal temperature conditions of +5°...+30°C according to the instructions. However, it is recommended to coat the walls at a temperature of about 20° - this way the solution adheres better and does not set prematurely in the tray and on the brush (roller). The room should be well ventilated to normalize the humidity level.

Stage 2: application

How to apply concrete contact with a brush and roller:

• they start working from the corners - they are painted over with a brush in the same way as with paint;
• It is convenient to cover the main area with a roller, dipping it into a tray with primer, rolling out the remains on the grate and applying the product to the walls.

When applying manually, the solution in the bucket must be stirred periodically - grains of sand settle at the bottom of the container.

Before loading the concrete contact into the spray gun, it is necessary to add 0.05 liters of water per 1 kg of soil to obtain a working consistency. The emulsion should be applied at a time, continuously covering the entire wall, floor or ceiling.

ANNEX 1

Information

additional characteristics

Reflection coefficient at an angle geometry of 0 - 45° of film for paints VD-VA-224, VD-AK-111, VD-KCh-183, VD-KCh-26A, VD-KCh-26 - no less than 82%, VD-KCh -577 – at least 75%.

The elasticity of the film when bending is 1 mm.

The mass fraction of residual styrene for VD-KCh-26A and VD-KCh-26 paints is no more than 0.03%.

Paint film washability, no more than:

VD-VA-224, VD-KCh-577 - 3.0 g/m2;

VD-KCh-26A, VD-KCh-26, VD-KCh-183 - 3.5 g/m2;

VD-AK-111, VD-AK-111r - 2.0 g/m2.

Conditional viscosity of paint according to a VZ-246 viscometer with a nozzle diameter of 4 mm at a temperature of (20.0 ± 0.5) °C is at least 30 s.

(Changed edition, Amendment No. 1).

Means of protection

Concrete contacts are chemically safe solutions, completely non-toxic. Nevertheless, it is recommended to use protective equipment when working with them - drops that get on the skin are not easy to wash off.

Windows and installed doors should be protected - they should be covered with cloth or covered with paper for the same purpose to prevent drops of acrylic and sand from settling. It is difficult to remove them due to the high adhesion of concrete contact with any surfaces. In addition, drops of soil can scratch the glass when removed.

Review of popular manufacturers

It so happens that the compositions of concrete contacts from different manufacturers differ little - the basic composition of the materials is similar. The difference is in the types of additives and proportions of components, which determines the price and properties of the solution.

We present the 5 best-selling concrete contacts in Russia (at the end of 2022):

ACCEPTANCE RULES

3.1. Acceptance rules - according to GOST 9980.1.

3.2. Standards for indicators , , table. the manufacturer determines periodically once a month for at least three batches.

Standards for indicators , , table. the manufacturer determines periodically at the request of the consumer.

If the periodic test results are unsatisfactory, the manufacturer shall check each batch until satisfactory test results are obtained in a row of at least six batches.

3.1, 3.2. (Changed edition, Amendment No. 1).

Properties and characteristics of concrete contact primer

Compound

Concrete contact is a styrene-acrylic dispersion consisting of water, technological additives, filler and pigment. Concrete contact primer becomes unique due to its special composition, the main role in which is played by fillers with a certain granulometry.

In cheaper domestic mixtures, the fillers are marble flour. And foreign manufacturers prefer to use quartz sand. However, according to the technical characteristics, both compositions are practically indistinguishable in terms of the quality of adhesion.

Adhesive primer is produced in two versions:

1. Concrete contact with filler fraction 0.3 mm;
2. Soil with a fraction of 0.6 mm.

A large fraction involves the use of soil for rough finishing, which is most often plaster. The 0.3 mm fraction is used for putty.

The composition may vary depending on the form of release:

1. ready-made mass, packaged in buckets or barrels,
2. dry - in the form of a powder mixture, involving mixing with water.

Application

The concrete contact primer was specially created for treating non-absorbent substrates, such as glass, some paintwork materials, tiles, etc. But this does not exclude its use for other purposes:

• preparing the ceiling for painting;
• reducing porosity and strengthening plasterboard sheets for subsequent finishing;
• surface treatment before applying plaster and putty;
• treating floors before pouring self-leveling coatings or screeds, etc.

Adhesive concrete contact primer has some nuances of use. The soil can only be used at positive ambient temperatures from +5 to +35°C.

Storing open containers at subzero temperatures is also unacceptable. However, this only applies to storage and use. The concrete contact primer, the characteristics of which are presented below, can be used at temperatures from -40 to +50°C.

Specifications

• Maximum fraction size – 0.3 mm, 0.6 mm;
• Complete drying – 3-6 hours;
• Frost resistance – at least 5 cycles;
• pH – 6.9-8.5;
• temperature for work - +5-+30°C;
• temperature for operation – 40-+60°С.

The consumption of concrete contact per 1 m 2 ranges from 250 to 400 g, depending on the type of surface and granulometry.

TEST METHODS

4.1. Sampling - according to GOST 9980.2.

4.2. Preparing samples for testing

Before testing, the paint is stirred and the mass fraction of non-volatile substances, pH, degree of grinding, and frost resistance are determined.

To determine other indicators, the paint is, if necessary, diluted with drinking water in accordance with GOST 2874* with a hardness (1/2 CaCl2) of no more than 7.0 mol/m3, condensate or distilled water in accordance with GOST 6709 to a viscosity of 20 - 30 s using a VZ-246 viscometer with a nozzle diameter of 4 mm (or VZ-4) at a temperature of (20.0 ± 0.5) °C when applied by pneumatic spraying or up to a viscosity of 40 - 80 s when applied with a brush. Then filter through mesh No. 1 according to GOST 6613 or two layers of gauze and apply to prepared according to GOST 8832, section. 3, records.

* GOST R 51232-98 is in force on the territory of the Russian Federation.

The color and appearance of the film, the resistance of the paint film to the static effects of water are determined on wooden plates measuring 50 ´ 100 mm, thickness 5 - 6 mm, conditional light fastness - on drawing paper in accordance with GOST 597 measuring 100 ´ 200 mm, hiding power and drying time - on glass plates for special purposes, size 90 ´ 120 mm, thickness 1.2 mm according to TU 21-0284461-058.

When determining the drying time, the paint is applied in one layer; when determining the color and appearance of the paint film, conditional light fastness, the paint is applied in two layers. When determining resistance to static water, paint is applied in two layers on both sides of the plate, as well as on the sides. Drying time between layers is 1 hour at a temperature of (20 ± 2) °C.

When determining hiding power, the second and subsequent layers are dried for 1 hour at a temperature of (20 ± 2) °C, then 1.5 hours at a temperature of (60 ± 2) °C and cooled for 0.5 hours at a temperature of (20 ± 2) °C.

The thickness of a single-layer film is 30 - 40 microns, two-layer - 60 - 80 microns. The thickness is measured with a micrometer type MK 25-1 according to GOST 6507 or another type of device with an error of no more than ± 3 µm.

Before testing according to indicators, table. the film is kept for 48 hours at a temperature of (20 ± 2) °C and a relative humidity of 60 - 70%, for indicator 1 - for 2 hours at a temperature of (20 ± 2) °C.

(Changed edition, Amendment No. 1).

4.3. Determining the color and appearance of the paint film

The color of the dried paint film is determined by visual comparison with the color of the corresponding samples (standards) of the “Card Index” color or control color samples in natural or artificial daylight diffused light. The samples to be compared should be in the same plane at a distance of 300 - 500 mm from the observer’s eyes at a viewing angle that excludes surface gloss.

The appearance of the dried paint film is determined visually in natural or artificial daylight.

In case of disagreement in the assessment of color and appearance, the determination in natural daylight is taken as the final result.

4.4. The mass fraction of non-volatile substances is determined according to GOST 17537, a sample of paint is dried at a temperature of (105 ± 2) °C for 40 minutes.

4.5. Determination of paint pH

4.5.1. Instruments, reagents and materials

pH meter with glass electrode, measurement error no more than 0.1 pH.

Glass glass V-2-50 according to GOST 25336.

Hydrochloric acid according to GOST 3118, solution with a mass fraction of hydrochloric acid of 3%.

Distilled water according to GOST 6709.

4.5.2. Carrying out the test

The paint is poured into a glass with a capacity of 50 cm3, thoroughly washed with distilled water, and the pH is determined. A new glass must be pre-treated with a hot solution of hydrochloric acid, and then rinsed thoroughly with distilled water.

4.5.3. Processing the results

The result of measuring paint pH is taken to be the arithmetic mean of the results of two parallel determinations, the absolute discrepancy between which should not exceed the permissible discrepancy of 0.1 pH.

The measurement result is rounded to the first decimal place.

The permissible total error of pH determination results is ± 0.1 with confidence probability P

= 0,95.

4.6. Determination of the hiding power of the dried film - according to GOST 8784, section. 1 or sec. 2. In case of disagreement in the assessment, the determination of hiding power by the instrumental method is taken as the final result.

4.6.1. Instrumental method for contrast ratio - according to GOST 8784, section. 2 with the following additions.

4.6.1.1. Carrying out the test

On a glass plate prepared according to GOST 8832, section. 3, measured (length, width) and weighed, apply one or two layers of paint.

The plate with the applied paint is alternately placed on a black or white plate and the brightness coefficients are measured at a wavelength of 560 nm (or a green filter at a wavelength of 560 nm) at four points on the film. The brightness coefficient is determined in accordance with the instructions for the optical device used for this determination.

The plate with the paint film is weighed and the contrast ratio ( C

):

where R

1,
R
2 - brightness coefficients when applying a plate with a film of paint to the black and white plates, respectively.

The result of measuring the contrast ratio is taken to be the arithmetic mean of the results of four parallel determinations, the discrepancy between which should not exceed the permissible discrepancy of 0.02.

The final result is rounded to the second decimal place.

If the contrast ratio is less than 0.98, apply another layer of paint and repeat the determination of the contrast ratio.

If the contrast ratio is more than 0.99, the determination is repeated, applying a smaller amount of paint to the plate.

With a contrast ratio of 0.98 to 0.99, the hiding power value is calculated.

4.6.1.2. Processing the results

Coverage index ( D

), g/m2, calculated by the formula

where m

1—weight of the plate with the dried paint film, g;

m

0—mass of unpainted plate, g;

106 is the coefficient for converting the area dimension from mm2 to m2;

S—

plate area, mm2.

For glass plates measuring 90 ´ 120 mm, the ratio is 106 / S

equals 92.6.

The result of measuring hiding power is taken as the arithmetic mean of the results of two parallel determinations, the discrepancy between which should not exceed the permissible discrepancy of 6 g/m2. The final result is rounded to the nearest whole number.

Permissible total error of the measurement result ± 4 g/m2 with confidence probability P

= 0,95.

4.6 - 4.6.1.2. (Changed edition, Amendment No. 1).

4.7. The resistance of the film to the static effects of water is determined according to GOST 9.403, method A.

After testing, the samples are kept before inspection at a temperature of (20 ± 2) °C for 3 hours.

Lightening of the paint film is allowed.

4.8. Determination of frost resistance of paint

4.8.1, 4.8.1.1 - 4.8.1.3 (Deleted, Amendment No. 1).

4.8.2. Method 2

4.8.2.1. Measuring instruments, auxiliary devices, reagents and materials

Refrigerating chamber providing a temperature of minus (40 ± 2) °C.

Thermometer in accordance with GOST 28498 with measurement limits from minus 90 to 30 °C and a division value of 1 °C.

Metal can according to GOST 6128 or polyethylene.

Glass plate.

Glass rod.

4.8.2.2. Carrying out the test

A metal can is filled halfway with paint, closed with a lid and placed in a refrigerator, where it is kept for 6 hours at a temperature of minus (40 ± 2) ° C, after which the can is left for 18 hours at room temperature. The cycle is repeated five times.

Then the paint is mixed and its resistance to coagulation is visually determined by evenly distributing the paint with a glass rod over a glass plate (test glass). Paint that has not been tested for frost resistance is also applied to a glass plate (control glass). The control and test glass are compared with each other.

Paint is considered frost-resistant if, after five freeze-thaw cycles, no hard lumps appear in a thin layer of paint.

(Changed edition, Amendment No. 1).

4.9. Conditional light fastness is determined according to GOST 21903, method 2.

From the middle part of three paints, prepared as specified in clause 4.2 of this standard, one sample measuring 50 ´ 50 mm is cut out. The paint sample is placed for 24 hours under the lamp at a distance of (250 ± 5) mm from it. After exposure under the lamp, the paint is kept for 2 hours in a dark place at a temperature of (20 ± 2) °C before taking measurements.

4.10 When carrying out measurements and tests, it is allowed to use other measuring instruments and laboratory glassware with similar metrological characteristics.

Advantages and disadvantages

The most important advantage is the increase in adhesion of the primed surface with subsequent finishing. By turning even smooth bases into rough ones, the concrete-contact soil significantly strengthens the plane. Thus, the occurrence of cracks or peeling areas is practically zero.

Concrete contact primer can be safely classified as a universal primer. This is due not only to the ability to process any base (concrete, ceramics, brick, plasterboard, wood, paintwork materials, etc.), but also to the versatility of the soil composition.

The adhesive primer contains antiseptic additives that reduce the likelihood of mold formation. The good water resistance of the resulting layer combined with excellent vapor permeability also minimizes the risk of fungus.

The composition is characterized by a high level of resistance to various alkaline environments, which indicates its practicality and durability.

Adhesive concrete contact primer is applied only to a thoroughly cleaned surface. Particular attention should be paid to peeled polymer coatings, since the adhesive primer from such areas will soon peel off. It is worth noting that the consumption of concrete contact per 1 m2 depends on the size of the fraction and the thickness of application.

Working with the mass is not accompanied by the presence of a sharp or toxic odor, however, neither is polymerization and further operation. The composition is absolutely harmless to the human body.