RU161043U1 - ANTI-CORROSION PRODUCT MATERIAL - Google Patents

Abstract

1. Anticorrosive material for wrapping products, consisting of interconnected outer layer, which is a flexible polymer film, and an inner layer made of non-woven material, which contains a corrosion inhibitor, characterized in that the outer layer or its fragment or fragments are made of vapor permeable material. 2. Anticorrosive material for wrapping products according to claim 1, characterized in that the outer layer is made of heat-shrinkable film. 3. Anticorrosive material for wrapping products according to claim 1, characterized in that it is made in the form of a web, sleeve or tape. 4. Anticorrosive material for wrapping products according to claim 1, characterized in that the non-woven material is made of artificial fibers or their combinations with natural ones. 5. Anticorrosive material for wrapping products according to claim 1, characterized in that the polymer film is made of polyolefins or polyvinyl chloride or polyethylene terephthalate. 6. Anticorrosive material for wrapping products according to any one of paragraphs. 1-5, characterized in that the outer and inner layers are interconnected over the entire surface, or stripes, longitudinal or transverse, or longitudinally transverse, including diagonal, or dotted, or dotted. 7. Anticorrosive material for wrapping products according to any one of paragraphs. 1-5, characterized in that applied contact or volatile corrosion inhibitors. 8. Anticorrosive material for wrapping products according to any one of paragraphs. 1-5, characterized in that the density of the nonwoven material is 10 ÷ 100 g / m. 9. Anticorrosive material for wrapping products according to any one of claims 1 to 5, characterized in that the film density is 20 ÷ 150 g / m.

Description

Corrosion-resistant material for wrapping products

The proposed utility model is intended for corrosion protection of metal products, including large ones, for example, rolled ferrous and non-ferrous metals (rolls and packs of flat products, pipes, rods, etc.), engineering products (parts and units of machines and mechanisms) and other metal products , in the process of their storage, loading and unloading and transportation.

Known materials for corrosion protection consisting of a laminated woven material, while the corrosion inhibitor is in the layer of the laminate [L1; L2]. The woven material serves to increase the tensile strength.

The disadvantages of these products are several factors. Volatile corrosion inhibitors are introduced into the laminate layer, which, due to the isotropy of the layer, evaporate both towards the protected product and into the surrounding space, which leads to an increased consumption of the inhibitor and, accordingly, reduces the protection time. Similar designs: fabric in combination with lamination can really provide a fairly high tensile strength. However, storage and movement of the products in question is usually carried out in flexible packaging, and impacts may occur. Therefore, in this case, the elongation of the anticorrosive material to rupture, which is minimal for laminated woven materials, takes precedence. In the event of a film rupture, water from the outside will fall into the packaging, causing rust formation.

            Known materials consisting of interconnected outer layer representing a polymer film and an inner layer made of non-woven material [L3; L4]. In accordance with these patents, the bonding of the layers is carried out using thermal adhesive, in which a volatile corrosion inhibitor is embedded.

This material has the following disadvantages. Evaporation of volatile corrosion inhibitors from the thermal adhesive is difficult, therefore, it is necessary to use relatively high concentrations of corrosion inhibitors and an increased amount of adhesive, which leads to an increase in the cost of the material. The possibility of using contact corrosion inhibitors in this material is absent.

Known materials consisting of interconnected outer layer, which is a flexible polymer film and an inner layer of non-woven material, which contains a corrosion inhibitor [L5; L6]

The disadvantage of this material is the following. Packaging products with its use is not sealed. Therefore, water, such as condensate, can accumulate inside the package. This provokes the formation of corrosion on the metal and requires higher concentrations of the corrosion inhibitor in the nonwoven material.

The objective of the utility model is to increase the degree of protection of products at minimum cost.

This object is achieved in that the anticorrosive material consists of an outer layer interconnected, which is a polymer film and an inner layer made of non-woven material, which contains a corrosion inhibitor, while the outer layer or its fragment, or fragments, are made of vapor-permeable material .

The proposed utility model works as follows.

            The protected product is wrapped with anticorrosive material. On top of it, as a rule, they install the appropriate packaging, usually flexible, protecting the product from scratches, dents, chips, etc., and the anticorrosive material from gusts or cuts. The modulus of elasticity of the packaging elements used must be less than the reduced modulus of elasticity of the protected product wrapped in an anticorrosive material. Thus, the material is part of the overall packaging of the product. The transportation and storage of products using such packaging usually does not exceed six months.

Corrosion-resistant material is installed with an inner layer of non-woven material with a corrosion inhibitor to the product. Non-woven materials can be made of natural and chemical fibers, including paper. An outer layer made of a polymer film will prevent water / moisture from entering the product and the evaporation of volatile corrosion inhibitors into the atmosphere. Depending on the shape of the product to be protected and the packaging scheme used, a volatile corrosion inhibitor or contact corrosion inhibitor may be used.

When moisture gets inside the package, it interacts with a corrosion inhibitor with the formation of a protective thin layer on the metal surface that effectively inhibits corrosion [L7].

Under mechanical influences, in particular, shocks that may occur during the movement of products, the outer packaging will begin to deform. Given that it (the packaging) is not carrier, part of the energy is transferred to the anticorrosive material. The most vulnerable in this case are the areas covering the ribs and corners of the protected products, the ends of the rolls and bundles, and so on. Upon impact, the anticorrosive material will experience a set of compression - shear - rupture strains. In this case, the material should be deformed without violating the continuity of the outer layer. The combination of polymer film - non-woven material allows to obtain a sufficiently high strength parameters in combination with a sufficiently large deformation without violating the continuity of the film.

The inner layer of nonwoven material in this design performs several functions simultaneously:

- tensile strength;

- absorption of moisture and its drainage;

- retention of the corrosion inhibitor.

Non-woven materials have a branched surface, therefore, a corrosion inhibitor can be embedded in a non-woven material either at the stage of obtaining fibers of the non-woven material (embedded in the fibers), or in the finished non-woven material.

Depending on the shoulders of the shipment, the transportation time of the products varies from several days to several months, and the storage conditions of the products also change. Correspondingly, the influencing factors also change, in particular, the possible set of physical and mechanical effects and the aggressiveness of the environment (sea fogs, tropical climate, etc.). Therefore, various product packaging is used. But in any case, it is not tight, the surrounding air, including sea fog, can penetrate the packaging and condense. As a result, moisture appears on the product, which provokes the oxidation of the metal.

For its removal, vapor-permeable materials are used. This may be, for example, a vapor-permeable polymer membrane or non-woven materials with appropriate properties. Typically, the area of vapor-permeable membranes is 0.1 ÷ 5% of the total area of the anti-corrosion material (Figure 3). However, in cases where the outer packaging covers the entire surface of the material, as well as when transporting goods over long distances, especially with the intersection of climatic zones, the area of vapor-permeable material must be increased. In the limit, it reaches 100% of the anti-corrosion area

material. The shape and dimensions of a particular fragment / fragments are selected taking into account the general packaging scheme and the amount of water vapor that must be removed from the package.

The use of heat-shrinkable film as the outer layer of an anti-corrosion material allows to increase the “density” of the package and, therefore, reduce the amount of air in the package and ensure better safety of the protected product. The most common use is polyethylene heat-shrinkable films; polypropylene, polyvinyl chloride, multilayer and other heat-shrinkable films are also used.

Several types of anticorrosive materials can be used depending on the geometric dimensions of the packaged products, packaging schemes and packaging equipment used. Materials in the form of a cloth (Figure 1) are used, as a rule, for manual packaging of products, for example, rolls and packs of metal. The use of material in the form of a sleeve (Figure 2) allows for better protection against moisture loss inside the package, but requires the use of mechanical equipment during packaging. Long products, for example, bundles of rods or pipes, it is advisable to pack on automatic lines using material in the form of a tape. Typically, the tape width ranges from 100 to 500 mm. It is equally effective to use automatic lines with tape material when packing ring products, for example, metal rolls.

The nonwoven material can be made of chemical fibers, for example, viscose, polyester, polyamide, polyacrylonitrile, polyethylene, polypropylene, or combinations thereof with natural fibers (combinations). The most widespread non-woven materials made of polypropylene and polyester fibers. When choosing the material of the inner layer, packaging schemes and possible effects on the packaged product during its transportation and storage are taken into account. For example: if it is known that the amount of moisture entering the package (mainly condensate) is limited, it makes sense to choose a non-woven material that can absorb this water. For these purposes, it is recommended to use polymer filaments of minimum linear density, usually 0.1 ÷ 0.5 TEKS with the addition of natural fibers. If the absorbent capacity of the material is not enough to remove moisture from the surface of the product, it is advisable to use polymer materials with threads of maximum linear density, more than 0.5 TEKS, which allow the drainage of the system. It is possible to use threads with the addition of components that make the material non-wettable. It is also necessary to take into account the physicomechanical properties of the nonwoven material.

As the material of the polymer film (outer layer), polyethylene of low or high density is most widely used. Also used: polypropylene; polyvinyl chloride; oriented or amorphous polyethylene terephthalate. When choosing films, their physical and mechanical properties and economic parameters are taken into account. As a rule, films with a surface density of 20 ÷ 150 g / m ^{2 are used} .

Bonding of the layers can be carried out either completely over the entire surface, or in stripes, or pointwise. Continuous bonding is usually thermally bonded. These materials have the highest physical and mechanical properties. Binding of layers is widespread by strips most often longitudinal, less often transverse or diagonal. To give the material isotropic properties, longitudinally-transverse strips are used. Fastening by strips is most often carried out by ultrasonic welding, less often by thermo- or adhesive bonding. The width of the strips is usually 3 ÷ 10 mm, the pitch between the strips is 50 ÷ 200 mm. Strips can be applied in dashed lines. For point bonding, thermo, ultrasonic, and adhesive bonding can also be used, including permanent adhesive. The material in the form of a sleeve (Figure 2) is recommended to be performed with a continuous connection. Striped or dotted joining is most commonly used in tape or web materials and has maximum deformation mobility. At minimum densities of non-woven material (10 ÷ 20 g / m ² ), a continuous connection of the layers is recommended.

As corrosion inhibitors, contact or volatile inhibitors may be used. Contact corrosion inhibitors, as a rule, work effectively in protecting products that have a simple shape: cylinder, box and so on. Volatile corrosion inhibitors are the most common and are especially effective in protecting multilayer products, for example, rolls and packs of metal, bundles of pipes, etc., as well as for protecting products of complex shapes.

From the application experience, when transporting by rail in cars up to 1000 km or during container transport or when transporting by road, the use of non-woven materials with a density of 10-40 g / m ^{2 is} sufficient [L8]. A minimum amount of condensate and minimal mechanical stress can be expected. Materials less than 10 g / m ² do not provide sufficient strength and do not have sufficient absorbent properties. When shipments by rail in wagons at distances of 1000 km or more, it is recommended to use non-woven materials with a density of 40 g / m ² to 80 g / m ² . When shipping by rail with transshipment in ports and shipping, the recommended density of the inner layer is 50-100 g / m ² . If this inner layer does not provide metal protection, it is necessary to change the outer packaging, since a further increase in density is not economically feasible.

Similarly, for the outer layer, polymer films of the following densities are used: 20 ÷ 50 g / m ² - transportation by rail up to 1000 km or by road, or container transportation. 50 ÷ 100 g / m ² - transportation by rail in wagons over distances of more than 1000 km and 90 ÷ 150 g / m ² - for shipments by rail with transshipment in ports and sea transport.

The proposed anticorrosive material is unknown from the prior art, is widely applicable in production, to ensure better safety of products at minimum cost, especially rolled ferrous and non-ferrous metal or large-sized parts of machines and mechanisms.

The proposed utility model eliminates the disadvantages of the known solutions, is distinguished by novelty, while ensuring the safety of metal products during transportation, loading and unloading and storage.

The proposed utility model is widely applicable in packaging devices for protecting metals from oxidation during loading and unloading, transportation and storage.

Literature

L1 - Patent No. 52833; “Material for protecting and / or wrapping products, packaging”;

L2 - Patent No. 60432 "Anticorrosive packaging polymer fabric";

L3 - Application for invention No. 2009140828 “Packaging material for corroded metal objects”;

L4 - Application for invention No. 97113517 “Material for protecting and / or wrapping products, packaging, method for producing wrapping material, adhesive mixture and method for its preparation”;

L5 - GOST 16295-93 “Anti-corrosive paper”;

L6 - Patent RU 2186714 C2 08/10/2002; "Material for the protection of products, packaging, a mixture of adhesive material and a method of obtaining a mixture";

L7 - Collection “Corrosion and corrosion protection” T1., M, 1979, “Results of science” I. Rosenfeld;

L8 - GOST 3811-78 “Textile materials. Fabrics, non-woven fabrics and piece goods. Methods for determining linear dimensions, linear and surface densities. "

Claims (9)

1. Anticorrosive material for wrapping products, consisting of interconnected outer layer, which is a flexible polymer film, and an inner layer made of non-woven material, which contains a corrosion inhibitor, characterized in that the outer layer or its fragment or fragments are made of vapor permeable material. 2. Anticorrosive material for wrapping products according to claim 1, characterized in that the outer layer is made of heat-shrinkable film. 3. Anticorrosive material for wrapping products according to claim 1, characterized in that it is made in the form of a web, sleeve or tape. 4. Anticorrosive material for wrapping products according to claim 1, characterized in that the non-woven material is made of artificial fibers or their combinations with natural ones. 5. Anticorrosive material for wrapping products according to claim 1, characterized in that the polymer film is made of polyolefins or polyvinyl chloride, or polyethylene terephthalate. 6. Anticorrosive material for wrapping products according to any one of paragraphs. 1-5, characterized in that the outer and inner layers are interconnected over the entire surface, or stripes, longitudinal or transverse, or longitudinally transverse, including diagonal, or dotted, or dotted. 7. Anticorrosive material for wrapping products according to any one of paragraphs. 1-5, characterized in that applied contact or volatile corrosion inhibitors. 8. Anticorrosive material for wrapping products according to any one of paragraphs. 1-5, characterized in that the density of the nonwoven material is 10 ÷ 100 g / m ² . 9. Anticorrosive material for wrapping products according to any one of claims 1 to 5, characterized in that the film density is 20 ÷ 150 g / m ² .

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