The composition and varieties of organosilicon paints, the technique of their application
Organosilicon paints hold a special place in the paints and varnishes market. They are characterized by ideal performance characteristics and a large number of shades. That is why these substances are very popular with consumers. To achieve an even coating through their application, it is important to strictly follow the instructions.
What is silicone paint:
This term is understood as a coloring composition, which is produced on the basis of polyorganosiloxane polymers. The composition is a multicomponent suspension, which contains many pigments. Additionally, solvents, silicone resins and modifying components are introduced into the agent. This is done taking into account the required operating parameters.
Composition and purpose
Heat resistance is considered the main advantage of this type of dyes. It is obtained at the expense of a large amount of energy during the bonding of silicon and oxygen atoms in the compound molecule. According to this parameter, the substance is significantly superior to the ordinary carbon-containing polymer.
Also, anti-corrosion components are introduced into the composition of the funds, which reliably protect against changing climatic conditions.
In addition, they contain acrylic varnishes and ethyl cellulose. Paints contain carbide substances and epoxy resins, which increase the parameters of resistance to external mechanical factors.
You can find a variety of shades of these dyes on sale. This is due to the addition of pigments to the composition, which retain their shade at temperatures up to +150 degrees.
The products can be applied to concrete and asbestos cement surfaces. They can be used for painting plaster or buildings covered with facade compounds.
The fact is that many materials do not tolerate moisture well. As a result, water gradually destroys the surface, disrupts the structure of the material and negatively affects its strength. To protect coatings against such factors, organosilicon dyes can be used. They are considered waterproof and can withstand large temperature variations.
Features
For organosilicon dyes, the following properties are characteristic:
- High parameters of frost resistance. The material is able to withstand 500 cycles of temperature change.
- Moisture resistant. Depending on the intensity, this figure is 24-40 hours.
- Long drying time. At an air temperature of +20 degrees, it takes 2 hours.
- Economic consumption. 1 square meter requires 150-200 grams of substance.
- UV resistant. Painted surfaces do not change color under the influence of sunlight.
- Affordable price.
- Application over a wide temperature range. Paints can be used at temperatures from -20 to +40 degrees.
- Corrosion protection.Therefore, organosilicon compounds are often used to color metal.
Coating durability
After drying, a solid film forms on the surface. Subject to the rules for using the substance, the durability of the coating is 15-20 years.
Advantages and disadvantages of silicone paint
Organosilicon has many advantages:
- excellent corrosion protection;
- the possibility of staining at temperature parameters from -20 to +40 degrees;
- long service life - 15-20 years;
- resistance to extreme temperature indicators - from -60 to +150 degrees;
- moisture resistance;
- affordable price;
- excellent electrical insulation characteristics;
- resistance to many solvents and chemicals.
At the same time, organosilicon materials also differ in some drawbacks. These include in particular the following:
- high toxicity of fumes when drying the material;
- negative effect on the mucous membranes of people in prolonged contact with paints;
- the ability to use only for outdoor work;
- impossibility to apply on damp surfaces.
Varieties and recommendations for choice
Today there are 2 types of these dyes:
- With limited heat resistance parameters. These funds are, in most cases, used for building facades. They have an extensive color palette. The limitations are due to the heat resistance of the pigment additives that are in the colorant. With temperature parameters above +150 degrees, there is a risk of destruction of the pigments that are in the enamel. As a result, the material loses its color. The period of use of these funds is 10-15 years.
- Heat resistant.They are used to prevent corrosion on steel, titanium or aluminum surfaces. These substances provide reliable protection of elements of industrial equipment from prolonged thermal exposure or high humidity. This type of enamel is commonly used to paint fireplaces or stoves. It is also ideal for fireplace applications. Thanks to this, it is possible to avoid a decrease in the strength parameters of materials that suffer from salt crystallization.
KM application technology
When applying the material, it is important to strictly follow the instructions. This will help achieve an even and attractive finish.
Surface preparation
When using organosilicon products, it is important to consider the type of surface to be painted. If you plan to apply the composition to a metal product, then it must be cleaned of dirt, oil stains and rust. It is also important to remove the old dye.
After cleaning the surface, the metal must be degreased. It is recommended to do this with a solvent. The cleaning of the surfaces to be painted must be carried out manually or mechanically. If necessary, individual surfaces should be coated with 1-2 coats of primer compatible with the organosilicon composition.
Paint with varnish
You can apply this type of stain in the following ways:
- With a roller or a brush. This method does not allow control of the thickness of the coating, which negatively affects adhesion parameters and subsequent performance.
- Pneumatic paint sprayer. In this case, there is a risk of increased material consumption and the appearance of harmful fumes.
- By immersion in the dye.This method can only be used with certain dimensions of the room and the presence of containers of the required volume.
In order for the enamel layer to be no thicker than the recommended 30-50 micrometers, in most cases it is applied without a primer. In this case, it is necessary to do 2-3 layers, observing an interval of a quarter of an hour. Sometimes it is worth doing a preliminary cleaning before painting the metal. To do this, it is degreased with solvents. Then you need to apply 2 coats of primer.
It is necessary to apply the composition at a temperature of -20 to +40 degrees. It is important to take into account that the surface must be completely dry.
The last step
The drying of the coating is considered an important part of the painting process. Facade structures can dry in the fresh air. Metal products are often placed in special drying ovens, heated to a temperature of + 150-200 degrees.
Intensive blowing of the painted surface can significantly speed up the drying process. It is important to take into account that this type of impact causes a decrease in the elasticity of the coating.
To dry products that have a complex configuration and have shielded surface fragments, it is worth using a thermo-radiation drying method. In this case, forced air circulation is used.
The use of catalysts for hardening such materials makes it possible to significantly reduce the drying temperature and even carry it out outdoors. Naphthenates of zinc, lead, cobalt, iron and other substances are used as catalysts. They are added to the paint in the amount of 0.1-2%.
It is important to take into account that the thermal stability of the film after the use of catalysts is significantly reduced. This is due to the intensification of destruction processes and the acceleration of thermal aging of the coating.
Drying time
On average, this type of stain takes 2 hours to dry. This duration is observed at a temperature of +20 degrees.
Safety precautions when working with enamel
The product is considered toxic and has fire hazard characteristics. Therefore, during work it is imperative to wear gloves and a respirator. When painting surfaces with a pneumatic method, a mask or goggles are required. In addition, the room should be well ventilated.
Do not use paint near open fire sources. Be sure to keep fire extinguishers nearby. Sand or a fire extinguisher is suitable for this. You can also use water spray.
Recommendations from the masters
For the successful use of silicone paint, it is important to strictly follow the recommendations of the masters:
- choose a quality composition from a trusted manufacturer;
- properly prepare the surface for painting;
- pay attention to the preparation of the dye for application - if necessary, it must be diluted with toluene or xylene;
- choosing the right method of applying the substance;
- use personal protective equipment.
The use of silicone paint makes it possible to obtain a beautiful and uniform finish. In this case, it is imperative to observe the technology of application of the substance. Compliance with security measures is of great importance.