Polyester powder for powder coating. Polyester. What is polyester powder paint

From chemistry lessons, everyone should remember what a polymer is. Even the laziest loser will definitely say what it is. Indeed, polymers consist of many components and often, thanks to this particular structural feature, they are high-quality things, no matter what.

Today we are talking about polymer roofs. Adhering to the same scheme as in chemistry, let's say for starters that polymer roofing is made of a material that contains many different components. Another thing is what these components are and why they are actually attractive: This is exactly what we have to figure out.

Special polymer coatings are used to give metal roofs decorative properties and additional protection against corrosion. They have been used in the West for over 40 years and are extremely widespread. Steel roofs with polymer coating have proven themselves to be a high-quality and durable material.

In general, the process of applying polymer coatings to galvanized steel is very complex and requires full automation and quality control at every stage of the process chain. Steel strip goes through stages pre-treatment, phosphating, priming, and only then applied polymer coating. Drying is carried out in a special chamber.

Galvanized steel sheet with polymer coating has a multilayer structure:

• steel sheet;
• zinc layer;
• passivating layer;
• soil layer;
• With bottom side sheet - protective paint;
• on the front side there is a layer of colored polymer.

Each component of the multilayer structure is carefully selected and performs its function. The consumer needs to know that different polymer coatings are characterized by different resistance to ultraviolet radiation(color fastness), to temperature (heat resistance), to aggressive environments, to mechanical damage and other factors.

So we finally come to the most important thing in studying this issue: let’s look at the components of polymer coatings, that is, the polymers themselves.

Acrylic

Acrylic as a polymer coating is nothing more than a paint layer. The catch is that this coating is considered the most unstable, unreliable and fragile. It is very easy to damage when installing the roof. In general, it fades in the sun (in about 5 years), and begins to peel off due to corrosion after 2-3 years. So acrylic coating loses very quickly and therefore has not been used by Westerners for a long time construction companies. Only found on sale domestic materials with such a coating, however, they are recommended to be used only for temporary structures.

Polyester (polyester enamel)

Here polyester is a more reliable and more serious coating in all respects.

It is one of the most common polymers on the polymer coating market for galvanized steel sheets. Polyester is considered a relatively inexpensive material, suitable for any climatic zones. It is resistant to mechanical and atmospheric influences(polyester with sprinkling is more resistant to mechanical stress quartz sand, however, it is significantly more expensive). In addition, when transporting polyester with quartz sand sprinkled, a number of problems arise related to the possibility of damage to the bottom layer metal sheets(quartz sand, like sandpaper, scratches the surfaces of the overlying sheets in contact with it).

Polyester has high color fastness and ductility. Heat resistance is about +120 0С. The polyester coating can be glossy or matte (modified Teflon).

Using polyester to coat galvanized steel sheet is reasonable and economical advantageous choice when the building is not in particularly polluted conditions environment, and the operating load is not too high.

PVF2 (polydifluorionad)

PVF2 is a material consisting of 80% polyvinyl fluoride and 20% acrylic. This polymer coating is particularly durable - it can withstand frost down to -60 0C and does not lose its properties at temperatures up to +120 0C. It is most resistant to ultraviolet radiation, practically does not fade, and has a beautiful shine. Compared to other coatings, it is the most expensive and is highly resistant to aggressive environments and mechanical damage. PVF2 has an extremely rich color palette: It comes in both glossy and matte finishes, as well as metallic finishes in silver or copper tones. To give a metallic shine, the standard PVF2 coating is supplemented with a layer of transparent varnish with pigment.

It is most advisable to use PVF2 in aggressive environments, such as the sea coast, industrial buildings of the chemical industry, etc.

Plastisol (polyvinyl chloride)

Plastisol is a decorative polymer. It contains polyvinyl chloride and various plasticizers. The thickness of the polymer coating for roofing steel sheets is 175 or 200 microns. Sheets are also produced with a 2-sided plastisol coating of 100 microns on each side. This material is, for example, used to make pipes and gutters.

Due to its large thickness, plastisol coating is one of the most resistant to mechanical damage. However, due to its low temperature resistance and low resistance to UV radiation (when heated by direct sunlight above +80 0C, the material ages quickly), it is not recommended to use it in southern regions. Having a large thickness, plastisol has high corrosion resistance, which creates additional protection in a polluted environment. Its color fastness is significantly lower than that of polyester (the coating evenly loses its color brightness after a few years).

With a thickness of 175 microns, the plastisol coating is only available smooth. And a stamped pattern can be rolled onto a coating 200 microns thick and given an embossed textured surface (at the same time, in the places of embossing, the thickness of the coating layer is significantly reduced).

Steel sheets with plastisol coating are an ideal material for the manufacture of seam roofs, since high ductility and large thickness of the coating protect the sheets from mechanical stress.

Pural

Pural - relatively new type polymer coating. They began to use it relatively recently. It is made on a polyurethane base modified with polyamide. What is good about pural? It has good chemical resistance, withstands solar radiation, high temperatures and large daily temperature changes. Minimum temperature when working with sheets coated with pural, -15 0C, maximum +120 0C. The coating thickness is 50 microns. This coating is suitable for profiled sheets because it is easy to process, both during profiling and during installation. Its ductility is guaranteed even at low temperatures. Pural has a silky matte textured surface.

The consumer needs to know that different polymer coatings are characterized by different resistance to UV radiation (color fastness), temperature (heat resistance), aggressive environments and mechanical stress, and other factors.

Let's look at the main types of polymer coatings.

Acrylic

Polymer roofing acrylic is a paint layer that is extremely unstable and can be easily damaged during roof installation. It has heat resistance up to +120°C, but fades in the sun within 5 years, in addition, it has average resistance to corrosion and begins to peel off after 2-3 years of use. Layer thickness 25 microns. Minimum processing temperature –10°С. Recommended for use only for temporary structures.

Polyester (polyester enamel)

The thickness of the roofing covering is 25-30 microns, and therefore the resistance to mechanical stress is not high. Polyester sprinkled with quartz sand is more resistant to mechanical stress, but it is significantly more expensive. In addition, during its transportation a number of problems arise related to the possibility of damage to the lower layer of metal sheets.
Polyester has high color fastness and ductility. Heat resistance is about +120°C. The polyester coating can be glossy or matte (modified Teflon). Suitable for buildings with low operational load.

Plastisol (polyvinyl chloride)

Due to its large thickness (175-200 microns), the polymer plastisol coating is one of the most resistant to mechanical damage. However, due to its low temperature resistance and low resistance to UV radiation (when heated by direct sunlight above +80°C, the material quickly ages) it is not recommended for use in the southern regions.
Having a large thickness, plastisol has high corrosion resistance, which creates additional protection in polluted environments. An ideal material for the manufacture of seam roofs. Its color fastness is significantly lower than that of polyester (the coating evenly loses its color brightness after a few years).

Pural

This is a new type of roofing based on a polyurethane base modified with polyamide. The material has good chemical resistance and can withstand solar radiation, high temperatures and large daily temperature changes. The minimum temperature when working with sheets coated with Pural is 15°C, the maximum is +120°C. The coating thickness is 50 microns. Easily processed both during profiling and installation. Has a silky matte surface.

PVF2 (polydifluorionate)

PVF2 is 80% polyvinyl fluoride, 20% acrylic. The coating is durable, can withstand frost down to –60°C and does not lose its properties at a temperature of +120°C. Most resistant to UV radiation, practically does not fade. It has a rich color palette, can be with a glossy or matte surface, with a metallic tint. Compared to others, the coating is the most expensive and is highly resistant to aggressive environments and mechanical damage.
It is most appropriate to use on sea coasts, chemical industry buildings, etc.

Powder paints and varnishes began to be used in the early 50s in the USA, and since then the need for these materials has been constantly increasing. In 2000, global production of powder paints in the world was estimated at 720 thousand tons, in 2003 it amounted to 875 thousand tons. According to Western experts, by 2008 it will amount to 1 million 220 thousand tons. At the same time, the share of powder paints will reach 18% of the total volume of paints and varnishes produced.

Over the past 40 years, powder coatings (PC) have been widely introduced into all areas of our lives. They are used to paint refrigerators, dishes, garden and surgical instrument, fittings, furniture (garden, office, medical, kitchen), vacuum cleaners, washing machines, microwaves, scientific instruments, electrical and plumbing tools, machine tools, computers, semiconductors, air conditioners, bicycles, motorcycles, cars, kiosks, shop windows and museums, agricultural machinery, aircraft and sea vessels, drilling tools and pipes (water, gas, oil with a diameter of 10 mm up to 2 m), pumps for all types of liquids, including highly aggressive ones, architectural and roof elements, electrical, radio and Appliances, toys, micro-electric motors and space stations and much more.

Powder paints are widely used primarily due to the fact that they do not contain solvents and consist 100% of substances that, when cured, turn into a thin layer, practically impenetrable to moisture, oxygen, acids, salts and others. chemical substances a high-strength and hard abrasion-resistant coating with a service life that sometimes exceeds the service life of the painted product.

Powder paints have the following advantages over traditional solvent-based paints:

Ready to eat

Powder paints are always supplied as a ready-to-use mixture and do not require dilution or other preparation.

No solvent

Powder paint contains no solvent or volatile substances, which greatly reduces the risk of fire, eliminates the problem of solvent disposal, and minimizes harmful effects on operating personnel.

Low waste percentage

The completeness of use of powder paint during application reaches 98%. Any paint that does not end up on the product can be returned and reused for painting. When using liquid paints, up to 60% of it is lost during application due to solvent evaporation.

Cost reduction

Receiving technology powder coating provides savings in materials (PC usage is 93-97%), energy (the volume of air used is renewed twice per hour instead of 15 times/hour with traditional painting methods), production areas(reduction by 30%) and labor costs (by 40-50%).

Manufacturability

Powder paint is easier to apply and there is no need to hire highly qualified personnel. The dyeing technology makes it possible to obtain the required film thickness from 35 to 250 microns when applied in one layer.

Improved properties

Powder paints make it possible to obtain coatings with high physical-mechanical, protective and decorative properties in the presence of a wide range of colors and effects ("metallics" and topcoat varnishes of various colors, structured surfaces (fine and large structure, "skin effect", "antiques", “moire”), coatings of varying degrees of gloss (glossy, semi-glossy, semi-matte, matte).

Due to these advantages, the specific cost of painting a unit surface area of ​​a product with powder paint is lower than when using conventional paints, despite their higher high cost. At the same time, the resulting coating has an increased complex of protective and decorative properties.

What are powder paints?

Powder paints are solid dispersed compositions that contain film formers (resins), hardeners, fillers, pigments and targeted additives. Regardless of the composition, the finished powder composition is a loose dispersed powder, which must have homogeneity, physical and chemical stability, and consistency of composition during storage and use.

The quality of composition preparation largely determines appearance and properties of coatings. PC manufacturing technology consists of several stages:

1) Dry mixing of components in a mixer. IN
the result is a so-called premix,
which is then sent to the extruder.

2) Extrusion: mixing components into
melt. The output is a homogeneous material
in the form of a tape, which is further crushed to obtain
so-called “chips” measuring 0.5-1 cm.

3) “Chips” are loaded into the mill, where they are crushed
to particle sizes typically ranging from 10 to 100 microns. At
In this case, the maximum share is made up of the fraction with
particle size 40-50 microns.

The finished PC is applied to products made of steel, aluminum, non-ferrous metals, glass, ceramics, wood, plastics and silicate materials in an electrostatic field (electrostatics, tribostatics, in fluidized bed baths).

The most widely used PCs are based on
thermosetting film formers.

Initially these were epoxy, polyester and acrylic PCs. Later, epoxy polyester (or hybrid) and triglycidyl isocyanurate-cured polyurethane and polyester (TGIC) were developed. Currently, the most common materials are polyester, epoxy-polyester and epoxy powder materials.

The choice of one or another type of powder paint should be determined primarily by what properties the coating should have, its purpose and the conditions of its operation.

Epoxy powder paints

The main advantage of epoxy powder paints is the optimal combination of good physical, mechanical and electrical insulating properties. Coatings based on them are characterized by exceptionally high adhesion, mechanical strength and chemical resistance. They can be used when painting products made of different metals without prior priming the surface. In turn, they can be applied as a primer under liquid and powder paints and varnishes. If increased corrosion resistance is required when using epoxy powder coating, it is recommended that ferrous metals and galvanized steel be phosphated, and aluminum and its alloys chromated.

Good resistance to alkalis and acids, aliphatic and aromatic hydrocarbons, oils, fuels, and water allow the use of epoxy PCs for external and internal protection of main pipelines. Using epoxies, it is possible to obtain coatings up to 500 microns thick with equally good hardness, elasticity and impact strength.

Traditional consumers of epoxy powders are electrical engineering and radio engineering, where these coatings replace many types of complex electrical insulation. Significant disadvantage epoxy coatings are their limited weather resistance (chalking when used in open areas) and their tendency to yellow due to overheating in the curing oven, especially if it is heated by gas.

Epoxy-polyester powder paints

If increased anti-corrosion requirements are not imposed on the powder coating and/or resistance to solvents is not required, epoxy powders are replaced with epoxy-polyester ones (a combination of epoxy and polyester resins is used), which are called hybrid powders.

When hybrid powders appeared, consumers were more attracted to them low price, but subsequently the expansion of their sales was due to technological advantages(for example, their coatings are resistant to overheating during curing), increasing mechanical properties, chemical resistance, as well as reduced sensitivity to ultraviolet radiation (for compositions with a low content of epoxy components). The use of epoxy polyesters with different ratios of epoxy and polyester resins allows them to be widely used for finishing household items, metal, garden, office, medical and school furniture, sports equipment, commercial, lighting and electrical equipment, etc. Epoxy polyesters are in great demand due to the high decorative qualities of coatings based on them. Modern technology obtaining powder paints made it possible not only to expand the color range of coatings, but also to achieve different textures coverings. These are coatings such as “moire”, “leather” coating, coatings with fine and large structure, a series of “antiques”, metallics of various colors. A special position is occupied by the so-called topcoat varnishes used to protect non-ferrous metals (bronze, copper, brass) and a thin layer of vacuum-deposited metal from oxidation, allowing to advantageously shade the surface, as well as varnish and filled compositions for glass (bottles for perfumes and cosmetics, etc. .d.).

Polyester powder paints

Polyester coatings are distinguished primarily by weather resistance, mechanical strength and increased abrasion resistance. Weather resistance of coatings polyester paints superior to any other powder materials. Dielectric properties are close to those of epoxy coatings. They have high gloss and good adhesion to metals, including light alloys. However, the alkali resistance of polyester coatings is low.

Polyester PCs are divided into two types:

1) triglycidyl isocyanurate cured (TGIC);

2) cured with a hydroxyl-containing hardener
type PRIMID.

TGIC-based coatings are the most weather-resistant and are used in architecture. However, there is rather conflicting information about the toxicity of this component, which entails the use alternative option based on PRIMID in cases where there is no need for particularly high weather resistance.

Purpose of polyester coatings: aluminum shaped profiles, architectural and building structures, wheel rims and machine parts, agricultural equipment, garden tools etc. Polyester topcoat varnishes with high weather resistance and gloss are used in multi-layer technology (for example, when painting wheel rims) for the final finishing of the product.

Polyester PCs also include the so-called “polyurethanes”, cured with blocked isocyanate and differing in a number of features. Polyurethane coatings are characterized by a stable gloss, water and weather resistance, resistance to liquid fuels, mineral oils, solvents. They are used to protect products subject to friction, abrasive wear, certain types of chemical equipment and containers for storing liquid and gaseous chemicals. However, in Western Europe and in Russia such materials have not received wide distribution.

The technological process of painting a product with powder material consists of the following stages:

Surface preparation: degreasing, removal of contaminants and oxides, if necessary and possible - transformation (conversion) of the surface to increase adhesion and protection against corrosion (phosphating, chromating); applying a layer of powder paint to the surface to be painted;

Formation of coating film: melting,
curing, cooling.

As a raw material for the manufacture of products, our company uses steel with various types of polymer coatings. Coatings are applied at factories that produce raw materials, at complex technological equipment. The galvanized sheet is coated with a phosphate anti-corrosion layer, then a primer is applied to improve adhesion and coated with back side protective varnish, and on the outside - a polymer coating (polyester, matte polyester, plastisol, PVDF, pural, polyurethane) that also has a certain color. Options for manufacturing products from a material with a double-sided polymer coating are also possible.

The appearance and durability of galvanized steel materials depend on the polymer coating, which protects it from aggressive environmental influences. The coating is applied at the factory using special technologies.

The anti-corrosion properties of galvanized steel with a polymer coating depend on the thickness of the zinc layer. Steel with a polymer coating and a zinc layer weight of 275 g per square meter. m will last until the first signs of corrosion of the ferrous metal appear 5-7 years longer than steel with a zinc layer mass of 180 g per square meter. meter. Over the years, the uncoated zinc layer is washed off the roof by ordinary rainwater. Therefore, the steel sheet from which façade and roofing materials, (metal tiles, corrugated sheets, metal siding, low tides, additional roofing elements) are additionally coated with two protective layers of polymer on the front side and varnish on the back side. Materials with double-sided polymer coating are available.

Let's look at common coatings:

CINK STEEL

GALVANIZED STEEL - steel having protective covering made of zinc. In the production of products, galvanized steel of special structural steel grades (S250GD, S280GD) from the world's leading plants with a zinc layer thickness of 18-20 microns on each side (275 g per m2) is used. Thanks to this, the products are optimally suited for construction and have unsurpassed durability. Products for roofing coverings made of steel coated over thin layer zinc (140-200 g of zinc per sq. m). Corrugated sheeting, flashings and additional elements made from such steel are suitable in cases where the service life of the roof and elements is designed for 10-20 years.

Aluzinc®

Aluzinc ® is a steel with a protective metal coating consisting of 55% aluminum, 43.4% zinc and 1.6% silicon. The thickness of the aluzinc coating is 20 microns (150 g/m2). Aluminum, thanks to the oxide film that appears on the coating, increases the corrosion resistance of the product material by an order of magnitude. In addition, products coated with Aluzinc® practically do not change their appearance during operation. It is thanks to the oxide film that Aluzinc ® has the highest corrosion resistance and unchanging appearance. Tests carried out on outdoors showed that after 30 years of operation, exposed to various environmental conditions, no traces of rust appear on the material. High corrosion resistance allows the use of Aluzinc ® products on roofs with a slope angle of less than 5 degrees.

• Aluzinc ® does not darken like galvanized steel.
• Aluzinc ® does not fade or scratch.
• Aluzinc ® Thanks to its 100% metal coating, it has a in great demand natural silver shine.

Aluzinc ® also contributes to the control of the climate inside the building, having excellent heat reflective properties, which gives Aluzinc ® thermal characteristics protective screen. We recommend using profiled products from Aluzinc ® as cladding (wall corrugated sheeting and siding). Aluzinc ® makes a building bright, attractive and durable. In terms of heat resistance, Aluzinc ® has an advantage among metal coatings, it does not emit toxic fumes, does not ignite or catch fire.

Polyester (PE)

POLYESTER (PE) - polyester-based coating. Products with this coating can withstand high air temperatures and are highly resistant to corrosion. The material is strong and quite durable: a roof made of steel sheets coated with polyester can last 20-30 years. Guarantee period- 10 years. Polyester owes its popularity to its high resistance to weathering, aesthetics, good performance color fastness, ductility, durability, huge selection color solutions and all this at very reasonable prices. In Russia, this material is actively used for the manufacture of roofing and wall structures, both in private and in multi-storey and industrial construction. The wide range of applications of polyester-coated steel is determined primarily by the fact that this coating is suitable for any climatic conditions. Products made of galvanized steel coated with polyester are a guarantee of durability and high corrosion resistance, a wide range of colors, multi-purpose applications, and an affordable price.

coating color map

MATTE POLYESTER (PEMA)

MATTE POLYESTER (PEMA) is a polyester-based coating. This coating is chosen by people who do not like their roofs to be shiny. If you run your hand over matte polyester, it will feel velvety. The reason is that its surface is not smooth, like other coatings, but is dotted with microscopic irregularities. sunlight, reflected from it, becomes scattered. Therefore the coating is matte. Since it is impossible to determine exactly what the thickness of the coating is in this case, it is applied in a thick layer, just in case, as a reserve. Therefore, its service life is longer than that of a polyester coating, although chemical composition same. Service life - 40 years. Warranty period - 15 years.
The material has high color fastness and mechanical resistance, retaining its qualities in any climate. Original coating Based on polyester, thanks to its velvety surface it very accurately imitates natural materials.
Matte polyester has an attractive texture. Due to the matte rather than glossy surface, like traditional polyester, an imitation is achieved natural materials. Increased resistance to chemical attack and good mechanical characteristics matte polyester is achieved due to the coating thickness - 35 microns.

This will help you choose the right color - coating color map

PVDF

PVDF is a coating consisting of polyvinyl fluoride (80%) and acrylic (20%). The most resistant polymer coating of steel to any non-mechanical environmental influences. Products made from PVDF are recommended for wall cladding, since it is in wall panels PVDF coating the best way will demonstrate its characteristics and ensure the longest service life. PVDF guarantees long-term safety of the roof and wall cladding. PVDF is the most environmentally friendly coating, does not fade over time and provides increased resistance to the corrosive effects of water, snow, acids and alkalis. The maximum operating temperature is +120 degrees, the minimum is -50 0 C. The color of the cladding or roof of your house, if it is made of steel with PVDF coating, will not fade or fade in the sun over time.
If your premises are located in an industrial part of the city, near roads, near lakes or on sea ​​coast, if you are building or tiling a chemical production facility, the walls of which will be frequently washed with water or disinfectant solutions, then the best material There will also be PVDF coated steel for you.
Galvanized steel with PVDF coating produced by Corus is available in both standard colors according to the RAL catalog and colors that imitate natural metals - aluminum, copper, gold.

PLASTIZOL (PVC)

PLASTIZOL (PVC) is a polymer consisting of polyvinyl chloride and plasticizers. Due to its large thickness (0.2 mm), this coating is the most resistant to mechanical damage, has high corrosion resistance, which creates additional protection in a polluted environment or on the sea coast, however, it has relatively low temperature resistance and quickly fades in the sun. Recommended use light colors plastisol, which fade less, heat up and reflect light better. The coating has a relief surface - embossing, imitating leather or a dashed notch, which does not give off sun glare.

This will help you choose the right color - coating color map

POLYURETHANE (PU)

POLYURETHANE (PU) - this coating is made from polyurethane modified with polyamide and acrylic. Polyamide gives it excellent UV resistance, while acrylic provides high strength. Has a silky matte surface. The durability of the material consists of high corrosion resistance, resistance to negative impact ultraviolet radiation, and unsurpassed resistance to mechanical damage. Nominal thickness coating - 50 microns. In addition, polyurethane has very high resistance to many acids, i.e. chemicals typical of industrial atmospheres. Salt spray test results confirm that the durability of materials with polyurethane coating persists in marine climates.
When processing and bending at low temperatures, the material does not form microcracks at bends. This coating is more durable than polyester. Service life - 30-50 years. Warranty period - 15 years.
Polyurethane-based coating has become widespread in Russia, thanks to its English counterpart. Colorcoat Prisma is produced in England by one of the world's largest metallurgical concerns Corus. Prisma coated steel has protective layer Galvalloy is composed of 95% zinc and 5% aluminum, providing unsurpassed anti-corrosion protection to the material. Products made with Prisma coating have the highest resistance to ultraviolet radiation and mechanical stress.

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Polymer coating is a unique opportunity to protect metal surfaces. This is the most effective and modern way combating corrosion, which sooner or later still appears on metal products.

What's the point?

To improve the performance properties of the metal, polymers are used that can react under certain conditions. Such coatings are dry compositions based on finely dispersed powder, to which hardeners, fillers and pigments are additionally added. It was not by chance that the polymer coating was chosen to enhance the metal: metals conduct electricity, as a result, the charge is transferred to the product, resulting in the formation of It attracts powder particles, holding them on the surface of the workpiece. The peculiarity of the polymer coating is its high degree of resistance to any type of impact. Moreover, it is aesthetically pleasing.

How does polymerization take place?

The powder coating shop consists of several sections:

• Product preparation area: in order for the polymer coating to be applied correctly and evenly, the metal product is first thoroughly cleaned of dust, rust, and dirt. It is advisable to use effective and phosphating. Mandatory stage- degreasing the metal surface.
• Sputtering chambers: in painting booth It is performed directly thermally, it can heat up to a temperature of 200 degrees and warms up evenly. The powder begins to melt, due to which an even and smooth coating is formed over the entire surface of the metal, and its pores are filled.
• Polymerization of the product is carried out in a cooling chamber: here the temperature gradually drops, and polymer film becomes harder. After 24 hours, the polymer coating is ready for use.

Painting technology: what's the point?

Powder coating is applied in several stages. At the first stage, the surfaces are processed. It is very important that metal products are thoroughly cleaned of dirt and oxides, and degreasing the surface will promote improved adhesion. After preparation, the masking stage is performed, that is, those elements are hidden metal product, which should not be exposed to the powder composition.

The parts to be processed are hung on transport system, then go to the painting booth. After spraying, a powder layer is formed on the metal. At the polymerization stage, a coating is formed, which is a melting of a layer of paint.

What are the features?

Metal treated with a polymer coating is reliable and increased strength. This is explained by the fact that a sealed monolithic film is formed, completely covering the surface of the product and firmly adhering to it. Thanks to the polymer coating, the metal has:

• high adhesion to the surface;
• high strength and wear resistance;
• long service life while maintaining original properties;
• rich color range;
• fast production cycle.

Polymer based various materials and coloring powders. The choice of a specific substance depends on the purpose for which the coating is applied, how important decorative properties.

Polyester

Polyester is most often used for polymer coating of metal. This inexpensive material, possessing high level flexibility, formability, moreover, it can be used in any climatic conditions. The polyester-based polymer-coated sheet is resistant to ultraviolet radiation and corrosion. The material forms a high-quality and durable film on the surface, due to which steel sheets are delivered intact under any transportation conditions.

Matte polyester is also widely used: the coating has a very small thickness, and the metal surface is matte. The peculiarity of this material is its high color fastness, good resistance to corrosion and mechanical stress.

Plastisol

Another popular polymer coating for metal is plastisol. As part of this decorative material- polyvinyl chloride, plasticizers; Outwardly, it attracts attention with its embossed surface. This is the most expensive coating, and at the same time the most resistant to mechanical damage due to the large thickness of the coating. On the other hand, the material does not have high temperature resistance, and therefore under the influence of sunlight high temperature the coating will deteriorate. Due to the large thickness, the corrosion resistance of plastisol is high.

Popular is steel with a polymer coating based on pural, which has a silky matte finish. structural surface. Resistance to temperature changes and chemicals makes this composition popular for metal processing.

Characteristics of polymer-coated steel

Features of polymer-coated materials are strength, formability, high corrosion resistance. After processing, the steel acquires a beautiful appearance, which can be given any colors and shades. Rolling is carried out in accordance with GOST, the polymer coating is of high quality. Painted rolled products can have a one- or two-layer coating; options are possible when the substance is applied on one or both sides. Thanks to the polymer coating, the performance properties of steel are improved:

• polymer-coated metal can be processed into finished products;
• the coating is distributed evenly over the surface, therefore the degree of protection is uniform;
• the absence of pores guarantees a good level of protective properties;
• steel has good adhesion;
• metal can retain its protective and decorative properties for more than 10 years.

From an economic point of view, polymer coating is more profitable: firstly, it contributes to high productivity and quality, since the cost of coating is reduced. Secondly, the buyer does not need to invest in additional processing steel to protect its surface. Note that the anti-corrosion properties of galvanized steel, which is treated with a polymer coating, depend on the thickness of the layer. To increase the service life of steel products, they are additionally coated with two layers of polymer, which makes the protection of the metal even higher.

Coating features

Polymer coating is a film that has a whole range of unique performance characteristics. Pre-painted rolled products are created on the basis of several types of polymers. Any material processed using this method - steel sheet or polymer-coated mesh - is impact resistant, corrosion resistant and has high adhesion. It is also important that powder coating allows you to make the metal surface of any color, including artificially aged, for example, in antique style.

Today, a popular method of painting rolled steel is Coil Coating. The essence of the method is that the coating is applied on an automated line, that is, rolled sheets are processed on the line, after which the coating is applied to them using roller machines. This technology has become widespread due to the fact that there is no loss of materials, and the line itself is more productive, and therefore profitable.

As with any other finishing work, you first need to prepare the surface, after which it is painted. This technology allows for high-quality processing of steel, aluminum and tinplate. Thus, polymer coating is an opportunity to improve the performance properties of the metal, increase its protective properties and ensure long service life.