Covering composition

 

(57) Abstract:

Describes coverts composition based on polyethylene, which differs in that the polyethylene is multimodal and is a mixture of at least a first polyethylene having a first average molecular weight corresponding to a melt flow TR12from 50 to 2000 g/10 min, and with the first molecular weight distribution, and the second polyethylene with a second average molecular weight greater than said first average molecular weight, and with a second molecular weight distribution, and the ratio between the first and second polyethylene is from 20:80 to 80:20, and the said mixture having a third average molecular weight corresponding to a melt flow TR32from 0.1 to 50 g/10 min, and the third the molecular weight distribution, corresponding to the ratio of Temecula melt PRP321/5from 10 to 50. A disadvantage of conventional opaque structures is their lack of covering ability and poor resistance to cracking from external loads. Currently developed covering composition, which has good performance on both these parameters. 3 C. and 32 C.p. f-crystals, 4 PL.

Izobreteniya of any type to protect and decorative properties. Protection can be directed against corrosion, ageing caused by oxidative processes, the effects of weather or against mechanical damage.

When the coating without solvent covering material must have good technical characteristics, namely in a wide temperature range can easily be translated into a form coverts melt, have low shrinkage, high mechanical strength, high surface quality and high resistance to cracking from external loads (ARVN). Because all of these requirements are difficult to meet, known still covering materials have averaged a compromise of properties, i.e., improving one performance is achieved at the expense of all the others.

If it were possible to avoid the above compromise of properties covering composition, this would be a significant achievement. Especially, it is desirable to improve such parameters opacity, as the melt flow in the coating process and the shrinkage of the covering material, as well as the stability of the product obtained from opaque material to cracking from external loads.

The problem solved by the invention is the obtaining of opaque material, ilusory interval and good resistance to cracking from external loads. The invention aims also to achieve effective speed of the coating determined by high speed punching shear extruded material.

In this case, the task of the invention is solved by covering composition, which is primarily characterized by the fact that he is a multimodal polyethylene containing ethylene and C3-C10-olefinic monomer units (respectively, from 80 to 99.8% by weight and 0.2 to 20% by weight), has a density of from 0,915 g/cm3to 0,955 g/cm3and is a mixture of at least a first polyethylene having a first average molecular weight and a first molecular weight distribution and the second polyethylene with a second molecular weight greater than said first molecular weight, and the second molecular weight distribution, with the mixture having a third molecular weight and a third the molecular weight distribution.

Under the multimodal polyethylene in the context of the present invention refers to polyethylene having a broad molecular weight distribution, which is obtained by mixing two or more plastic components of different molecular weight or polymerization of ethylene in two Kodaly polyethylene, in contrast, receive only one plastic component manufactured in a single operation.

The average molecular weight and molecular weight distribution can be measured using any conventional method, applicable to plastic products. For them it is convenient to measure and Express the average molecular weight as melt TRimwhere i refers to the specified first, second, and third average molecular weights, a m - to the load piston extruder used in the measurement values of TR. In the examples below, this load is usually 5,0 kg (m = 5, see ISO 1133). Molecular weight distribution is convenient to Express it as the ratio of Temecula melt PRPim1/m2, namely the relationship between the values of TR at high and low load, where i refers to the specified first, second, and third molecular weight distributions, and m1and m2refer, respectively, to a high load, usually of 21.6 kg (m = 21) and low load, usually 5,0 kg (m = 5) or of 2.16 kg (m = 2).

Under the fluidity of the melt (TR) refers to the weight of the polymer pressed at standard temperature through a standard cylindrical g is th viscosity of the molten polymer, and therefore, a measure of its average molecular weight. Than less than TR, the more average molecular weight. This option is often used for characterization of polyolefin, particularly polyethylene, under the following standard conditions of measurement TRm: temperature 190oC, the size of the head of 9.00 cm (length) and 2,095 cm (diameter), the load piston of 2.16 kg (m = 2), 5,0 kg (m = 5), 10,0 kg (m = 10), 21,6 kg (m = 21), see Alger, M. S. M., Polymer Science Dictionary, Elsevier 1990, p. 257.

Under the relation of Temecula melt (PRPim1/m2) refers to the ratio of the melt flow during melting (TRm1), measured at standard temperature and a standard head size with the large load m1to melt (TRm2), measured at the same temperature and the same size of the head using a small load (m2). Usually for polyethylenes big load m1is 21.6 kg (m1= 21), and a small load of m2is 5.0 kg (m2= 5) or of 2.16 kg (m2= 2) (ISO 1133). The higher the value of PRPim1/m2, the wider the molecular weight distribution.

The present invention is based on the discovery of the fact that the multimodal polyethylene of the region is an exceptional resistance to cracking from external loads.

Covering composition according to the present invention is a multimodal polyethylene. Multimodal polyethylene is, by definition, a mixture of at least two polyethylenes having different molecular weight. According to an important variant of implementation of the present invention the mixture is a product of a polymerization process comprising at least two operations (stages). In this process, these first and second polyethylene receive, respectively, first and second operation in the presence of catalytic systems. These operations can be performed in any order, provided that the produced in each operation, the polymer present in the next operation (in the following operations). Preferably, however, to this mixture were the product of a specified polymerization process, in which the specified first operation before the specified second operation. This means that you get a polyethylene with a lower average molecular weight, and then in his presence get a polyethylene with a higher average molecular weight.

The idea of the present invention may be implemented with any type of catalyst floor is R based on transition metals of group 4. According to one of embodiments of the present invention the mixture, forming a multimodal polyethylene is a product of the polymerization process, in which the first and/or second operations are performed in the presence of a catalytic system comprising precatalysts based compounds of tetravalent titanium, such as TiCl4/MgCl2/possible, inert media/possible, precatalysts with internal electron-electron interaction, and socialization based organoaluminium connection, preferably R3Al/possible, precatalysts with an external electron-donor interaction, where R is a C1-C10-alkyl. Typical catalytic systems receive, for example, according to the documents WO 91/12182 and WO 95/35323 included in the present description by reference. Preferred one system that catalyzes the polymerization system is based on metallocenes metals of group 4 (IUPAC 1990) and alumoxane.

When conducting the specified polymerization process comprising at least two operations that can be used one or several catalytic systems, which may be identical or different. PR is ing the catalytic system of the type specified in the first operation and the same specified catalytic system is used in at least the specified second operation.

The most convenient method of regulating the molecular weight in the process multitudinous polymerization according to the present invention is to use hydrogen, which acts as miaocheng reagent, including the cross-linking operation mechanism of polymerization. Hydrogen in an appropriate amount can be added to any operation multitudinous polymerization. However, it is preferable that specified in the first operation used amount of hydrogen that provides for a specified first polyethylene, the amount of melt TR12from 50 g/10 min to 2,000 g/10 min, most preferably from 100 g/10 min to 1000 g/10 min, provided that the first operation before the specified second operation.

There is information about how to obtain multimodal and especially bimodal olefin polymers in two or more polymerization reactors connected in series. Examples of such reactions are given in the documents EP 040992, EP 041796, EP 022376 and WO 92/12182 included in the present description in terms of receiving multimodal polyethylenes to declare opaque material through links on them. According to these references, each of these operations polymeris ateneu it is preferable to carry out these operations polymerization in combination, a suspension polymerization and gas phase polymerization. Preferably, the first specified operation was suspension polymerization and the second polymerization gas phase.

The suspension polymerization is preferably carried out in the annular reactor (circulatory loop). The gas phase polymerization is carried out in gas-phase reactor. Operations polymerization may precede, though not necessarily, prepolymerisation, during which the formation of up to 20%, preferably 1-10%, by weight of the total polyethylene.

Above mentioned about the use of hydrogen to control molecular weight polyethylenes. Properties of polyethylenes can also change any of these operations polymerization by adding a small amount of olefin. According to one of embodiments of the present invention said first polyethylene has a content of C3-C10-olefinic monomer unit from 0.2 to 20% by weight of the specified first polyethylene. For the second specified polyethylene preferably the content of C3-C10-olefin such as 1-butenova or 1-hexenoic, of monomer units from 1 to 25%, most preferably from 2 to 15% by weight from the specified second polyethylene.

When the ethylene defined above, TR12and the second of the obtained polyethylene with a lower TP is between 20:80 and 80:20, preferably between 20:80 and 60:40.

The above polymerization conditions for various operations can be coordinated so that the resulting mixture had the best hiding power to the solid substrate. Thus, for a given multimodal mixture of polyethylene can be obtained from the following preferred properties.

According to a preferred variant implementation of the present invention, the above-mentioned mixture fluidity of the melt TR32is from 0.1 to 50 g/10 min, more preferably from 0.1 to 20 g/10 minutes According to a preferred variant implementation of the contents of C3-C10olefin monomer unit in the above-mentioned mixture is from 0.2 to 20%, more preferably from 0.5 to 15% by weight of this mixture. According to a preferred variant implementation of the ratio of Temecula melt PRP321/5this mixture is from 10 to 50, more preferably from 15 to 40. It follows that the sign of a good result is the presence of multiple peaks or a broad peak in the absence of small fractions of material with extremal specified ratio of Temecula melt.

As mentioned above, the multimodal polyethylene according to the invention can be obtained by the reaction of polymerization, comprising at least two operations, leading to different average molecular weights. Another important variant of the invention, the multimodal polyethylene can be obtained by mixing at least two polyethylenes of different average molecular weight. In the latter case, the specified mix is a mechanical mixture of at least the above first and second polyethylenes, preferably a mechanical mixture of the above first and second polyethylenes.

When mixing two polyethylenes of different average molecular weight greater part of the mixed melt in the apparatus for the melting process type compound machines and extruder. In this case, the product is a mechanical molten mixture is at least above the first and second polyethylenes. Preferably, attended only by two polyethylene, i.e. that a mechanical mixture of melts was a mixture of the above first and second polyethylene. The preferred ratio between the first and second polyethylene is from 20:80 to 80:20, most is here melt TR12is preferably from 50 to 2000 g/10 min, most preferably from 100 to 1000 g/10 minutes When introduced into a blending operation for at least the specified second polyethylene his or fluidity of the melt TR2andso on21is preferably from 0.05 to 50 g/10 min, most preferably from 0.10 to 20 g/10 min.

In its most broad interpretation of the present invention relates to opaque composition containing any of the multimodal polyethylene. This means that you can use different polyethylenes, which may be Monomeric composition as homopolymer and copolymer type. Preferably, the content of C3-C10-olefinic monomer unit in the specified first polyethylene ranged from 0.0 to 10% by weight, calculated relative to the weight of the specified polyethylene.

Usually at least one polyethylene component of this mixture is ethylene copolymer containing a small amount of other olefins. For the specified second polyethylene, the content of C3-C10-olefin, preferably 1-butenova or 1-hexenoic, of monomer units is preferably from 1.0 to 25% by weight, is applying a mixture of more than two polyethylene components other plastic components can be homopolymers, and copolymers.

Thus, for a variant of the invention, in which the covering composition in the form of a multimodal polyethylene is produced by mixing at least first and second polyethylene, the ratio of the first, second, and so on, polyethylenes, TR1, TR2and so on, these polymers and the contents of C3-C10-olefinic monomer unit in the above-mentioned mixture should preferably be such that TR32the mixture ranged from 0.1 to 50 g/10 min, preferably from 0.1 to 20 g/10 min, Respectively, but regardless of this, the content of C3-C10-olefinic monomer unit in the above-mentioned mixture is from 0.2 to 20% by weight, preferably from 0.5 to 15% by weight. The ratio of Temecula melt PRP321/5this mixture is from 10 to 50, preferably from 15 to 40.

The curve of molecular weight distribution shows the presence of multiple peaks or a broad peak in the absence of small fractions of a material with extremely low and extremely high molecular weight. It was found that although the melt flow, the content comonomeric links and acucela melt were in fact the same as that of the WPI is knogo molecular weight, improves in relation to the technological process, as measured by speed of rupture and resistance to cracking from external loads.

What I described above is suitable for covering the composition of polyethylene, a product multitudinous polymerization or mixing. The invention relates also to the covering composition, obtained by combination multitudinous polymerization and mixing, for example, by polymerization of ethylene in two or more operations, and mixing the product with one or more polyethylene. In addition, after polymerization or mixing the final product may be further subjected to processing to change its average molecular weight and molecular weight distribution.

According to one of embodiments of the present invention the said mixture is a mixture processed in the correction operation, which includes heat, melt processing and performance for multimodal polyethylene controlled radical reactions, with the aim of obtaining a molecular weight at least as good as the raw mixture, and molecular weight distribution which is wider than the raw mixture.

Preference is, -(PSA3'5- PSA35):PSA35where TR3'5the melt index of this mixture after the specified corrective action, ranged from 5 to 100%, preferably from 10 to 80%. Upper limits should not be interpreted as limitations, they are given only as illustrations based on the experimental results obtained in connection with the present invention. In any case, it is shown that the viscosity of the melt is reduced by several tens of percent. This means that the controlled free radical reaction, in essence, lead to the unification of the radical fragments into longer molecules of polyethylene, than to conduct a controlled free-radical reactions.

Perhaps even more important is the impact of corrective action on the molecular weight distribution, expressed as the ratio of Temecula melt mixture. According to one embodiments of the invention, the relative expansion of the molecular weight distribution, expressed as +(PRP3'21/5NEG321/5) : PRP321/5where PRP3'21/5- the ratio of Temecula melt this mixture after this correctyou yuusha operations may be implemented in various ways. First, free radicals can be generated from the initiators in various ways, among which the most common are thermal or photochemical rupture of intermolecular bonds, redox reactions and photochemical production of hydrogen, however, find application and other processes, such as radiation or electron beams. Free radicals can be generated by reaction of thermal decomposition of polyethylene mixture in the presence of oxygen or in an oxygen-free environment. A good method is to heat treatment, especially when using non-stabilized or partially stabilized polyethylene, and polyethylene, destabiliziruetsya during processing.

Up to the present time one of the main obstacles for the application of polyethylene as a covering material was unsatisfactory resistance to cracking from external loads. Another obstacle was poor manufacturability coverts process for polyethylene melts. Commercial and technical result of the detection according to the present invention the detection of robust multimodal polyethylene to pout opaque composition. Covering composition according to the present invention has resistance to cracking from external loads (URWIN, F20) (ASTM, American society for testing and materials, 1693/A, 10% lgepal) at least 100 hours, more preferably at least 500 hours, even more preferably at least 1000 hours, and most preferably 2000 hours.

In principle, covering the composition according to the invention is suitable for any solid substrate, such as a particle, powder, grain, sand, granules, pellets, filler, fiber, film, elastic shell, defect plaster, coating, paint, plastic, diaphragm, membrane, skin, wall, protective coating, foil, thin sheet, fabric, cloth, canvas, fabric, tissue paper, newspaper, Board, thick paper, cardboard, wood fiber Board, bookbinding paper, carton, disc, layered material layer, plate, plate, concrete pad, slice, spacer, thin disk, tape, belt, material for tightening, tape, sharpener, cord, strip, strip, rope, thread, file, flange, thread, wire, steel cable, cable, wire rope, yarn, rope, tubing, cord, line, steel rope, building, block, item, casting, billet, prefabricated, fasanya, the disc, arm, boom, pole, rod, shaft, shank tool, needle, rod, lever, Chuck, arm, stud, about the axis of the flue pipe, rod, tube, hose, flexible hose, coupling, barrel, gutter, pipe, drain pipe, valve profile.

Preferably opaque composition according to the invention is a coating material to a rigid substrate made of metal, such as iron, steel, noble metals, metal alloys, composite metals, hard alloys, metals, obtained by sintering, metal or non-metal, such as concrete, cement, mortar, plaster, stone, glass, porcelain, ceramics, refractory materials, enamel, wood, bark, cork, paper and bookbinding paper, textiles, leather, rubber, and rubber, plastic and bituminous materials.

Most preferably, the inventive covering composition is a coating material for a hard, solid substrate, preferably a rigid tube, rigid fitting or hard profile, most preferably iron or steel pipe, fitting, or profile. More specifically, this pipe is an iron or steel pipe with steel covering the surface of the primer type epoxy the turn the inventive covering composition is applied to the layer carboxylating polyethylene.

In addition to the above-described opaque composition the present invention relates also to a method for the specified opaque composition, the inventive method described above.

The invention also relates to the use of opaque composition according to the above description or obtained through the proposed method for coating a solid substrate, such as a particle, powder, grain, sand, granules, pellets, filler, fiber, film, elastic shell, defect plaster, coating, paint, plastic, diaphragm, membrane, skin, wall, protective coating, foil, thin sheet, fabric, cloth, canvas, fabric, tissue paper, newspaper, Board, thick paper, cardboard, wood fiber Board, bookbinding paper, carton, disc, layered material, layer, plate, plate, concrete pad, slice, spacer, thin disk, tape, belt, material for tightening, tape, sharpener, cord, strip, strip, rope, thread, file, flange, thread, wire, steel cable, cable, wire rope, yarn, rope, tubing, cord, line, steel rope, building, block, devka, special casting, special billet, bar, arm, boom, pole, rod, shaft, shank tool, needle, rod, lever, Chuck, arm, stud, about the axis of the flue pipe, rod, tube, hose, flexible hose, coupling, barrel, gutter, pipe, drain pipe, valve profile.

The preferred application is directed to coating a solid substrate made of metal, such as iron, steel, noble metals, metal alloys, composite metals, hard alloys, metals, obtained by sintering, metal or non-metal, such as concrete, cement, mortar, plaster, stone, glass, porcelain, ceramics, refractory materials, enamel, wood, bark, cork, paper and bookbinding paper, textiles, leather, rubber, and rubber, plastic and bituminous materials.

The application of the invention is most preferably used to cover the hard, solid substrate, preferably rigid pipe, in particular, rigid pipe fitting or profile, most preferably iron or steel pipe, fitting, or profile. In the case of coatings of metal pipes such as iron or steel pipe, coating composition according to the invention, t is at the forefront binding reagent type carboxylating polyethylene, then, on the layer specified binding reagent is applied covering composition.

Below, only for the purpose of illustrating the present invention and some examples. In these examples were obtained and tested bimodal polyethylene. The receipt was as follows.

Example 1

Bimodal polyethylene N 1 was obtained with the catalyst type Ziegler-Natta, prepared according to the patent Finland N FI 942945, one ring and one gas-phase reactors connected in series. In the annular reactor Aten (ethylene) polymerizable in the presence of hydrogen, with a TR2= 468. In gas-phase reactor Aten has polymerizable with 1-butene and hydrogen. The performance of the reactors was 45%/55%. In the final product TR2= 1,3, NEG21/5= 18 and density = 941 kg/m3.

Bimodal polyethylene N 2 was obtained with the catalyst type Ziegler-Natta in one ring and one gas-phase reactors connected in series. In the annular reactor Aten has polymerizable in the presence of hydrogen, with a TR2= 444. In gas-phase reactor Aten has polymerizable with 1-butene and hydrogen. The performance of the reactor was 40%/60%. In the final product TR

Example 2

Bimodal polyethylene N 3 was obtained with the catalyst type Ziegler-Natta, prepared according to the patent Finland N FI 942949, one ring and one gas-phase reactors connected in series. In the annular reactor Aten has polymerizable in the presence of hydrogen, with a TR2= 492. In gas-phase reactor Aten has polymerizable with 1-butene and hydrogen. The performance of the reactors was 45%/55%. In the final product TR2= 0,4, REF21/5= 21 and density 941 kg/m3.

Bimodal polyethylene # 4 was obtained with the catalyst type Ziegler-Natta in one ring and one gas-phase reactors connected in series. In the annular reactor Aten has polymerizable in the presence of hydrogen, with a TR2= 53. In gas-phase reactor Aten has polymerizable with 1-butene and hydrogen. The performance of the reactors was 44%/56%. In the final product TR2= 0,3, REF21/5= 17 and the density of 941 kg/m3.

As a control product used commercial covering material for steel pipes HE6060 company Borealis.

Example 3

Bimodal polyethylene N 5 was obtained with the catalyst type Ziegler-Natta cooked with. In the annular reactor Aten has polymerizable in the presence of hydrogen, with a TR2= 384. In gas-phase reactor Aten has polymerizable with 1-butene and hydrogen. The performance of the reactors was 45%/55%. In the final product TR2= 0,5, REF21/5= 19 and density resin-base 944 kg/m3.

Bimodal polyethylene N 6 was obtained with the catalyst type Ziegler-Natta, prepared according to the patent Finland N FI 942949, one ring and one gas-phase reactors connected in series. Before the introduction of the catalyst in the annular reactor spent prepolymerisation. The degree of prepolymerisation was 62 g/g In the annular reactor Aten has polymerizable in the presence of hydrogen, with a TR2= 274. In gas-phase reactor Aten has polymerizable with 1-butene and hydrogen. The performance of the reactors was 48%/52%. In the final product TR2= 0,5, REF21/5= 20 and the density of the resin-base 945 kg/m3.

Bimodal polyethylene N 7 was obtained with the catalyst type Ziegler-Natta, prepared according to the patent Finland N FI 942949, one ring and one gas-phase reactors connected in series. In the annular reactor Aten polymerize the nom reactor Aten has polymerizable with 1-butene and hydrogen. The performance of the reactors was 43%/57%. In the final product TR2= 0,5, REF21/5= 19 and density resin-base 927 kg/m3.

The main properties of the final products of examples 1-2 are shown in tables 1 and 2. Table 1 comparison of opaque materials No. 1 and No. 2 according to the invention with a commercial material (HE6066). As can be seen from table 1, in terms of resistance to cracking from external loads (ARVN) and speed jacking covering material according to the invention is superior to the corresponding conventional covering material.

Table 2 comparison of opaque materials N 3 and N 4 according to the present invention with the corresponding commercial opaque material (HE6060). As can be seen from table 2, the materials according to the present invention is significantly superior to conventional covering materials and also at a lower level TR2.

It is seen that, despite the higher melting temperature, power consumption and pressure in the head to control material were high, indicating a deterioration in processability as compared with the materials of this invention.

A very important characteristic of the covering material is Maximale for materials according to this invention, the linear speed can be increased by at least 67% compared with the control material HE6060. Note that a further increase speeds above 25 m/min are limited not by the destruction of the polyethylene films N 5, N 6 and N 7, and the hardware capabilities.

1. Covering composition based on polyethylene, wherein the polyethylene is multimodal and is a mixture of at least a first polyethylene having a first average molecular weight corresponding to a melt flow TR21from 50 to 2000 g/10 min, and with the first molecular weight distribution, and the second polyethylene with a second average molecular weight greater than said first average molecular weight, and with a second molecular weight distribution, and the ratio between the first and second polyethylene is from 20 : 80 to 80 : 20, and the said mixture having a third average molecular weight corresponding to a melt flow TR23from 0.1 to 50 g/10 min, and the third the molecular weight distribution, corresponding to the ratio of Temecula melt OTP21/53from 10 to 50.

2. Covering composition under item 1, characterized in that it contains from 80 to 99.8% by weight of ethylene monomer units and from 0.2 to 20% by weight WITH3-C10-olefinic monomer unit.

3. Covering structure on p. 1 Ilha do Mel links is from 0.2 to 20% by weight of the specified first polyethylene.

4. Covering composition according to any one of paragraphs.1 to 3, characterized in that the specified second polyethylene content3-C10-olefinic monomer unit is from 1 to 25% by weight of the specified second polyethylene.

5. Covering composition according to any one of paragraphs.1 to 4, characterized in that the above-mentioned mixture ratio between the first and second polyethylene is from 20 : 80 to 60 : 40.

6. Covering composition according to any one of paragraphs.1 to 5, characterized in that the ratio of Temecula melt OTP21/53is from 10 to 50, with the curve of the molecular weight distribution of the observed multiple peaks or a broad peak, in the absence of small fractions of a material with extremely low and extremely high molecular weight.

7. Covering composition under item 1 or 2, characterized in that the said mixture is a mechanical mixture of at least the above first and second polyethylenes.

8. Covering composition according to p. 7, characterized in that the said mixture is mechanical molten mixture of the above first and second polyethylenes.

9. Covering composition under item 7 or 8, characterized in that the ratio between the first and second polyethylene sostav the P21specified the first polyethylene is 100 - 1000 g/10 min.

11. Covering composition according to any one of paragraphs.7 to 10, characterized in that the fluidity of the melt TP212the specified second polyethylene is 0.05 - 50 g/10 min.

12. Covering composition according to any one of paragraphs.7 to 11, characterized in that the above ground polyethylene content3-C10-olefinic monomer unit is from 0.2 to 20% by weight of the specified first polyethylene.

13. Covering composition according to any one of paragraphs.7 to 12, characterized in that the specified second polymer content of C3-C10-olefinic monomer unit is from 1 to 25% by weight of the specified second polyethylene.

14. Covering composition according to any one of paragraphs.7 to 13, characterized in that the fluidity of the melt TR23this mixture is 0.1 - 20 g/10 min.

15. Covering composition according to any one of paragraphs.7 to 14, characterized in that the above-mentioned mixture, the content of C3-C10-olefinic monomer unit is from 0.2 to 15% by weight.

16. Covering composition according to any one of paragraphs.7 to 15, characterized in that the ratio of Temecula melt OTP21/53this mixture is from 15 to 40, while the curve MOLEKULYaRNAYa with extremely low and extremely high molecular weight.

17. Covering composition according to any one of paragraphs.7 to 16, characterized in that its resistance to cracking from external loads (URWIN, F20) is at least 100 hours

18. Covering composition under item 17, characterized in that its resistance to cracking from external loads (URWIN, F20) is at least 2000 hours

19. The method of preparation of the covering structure on p. 1 by polymerization of ethylene in the presence of a catalytic system, characterized in that it consists at least of the following in any order of the first and second operations polymerization of ethylene with receiving the said first and second polyethylenes, respectively, with the polyethylene obtained in each operation, is present in the following operations or in the following operations.

20. The method of preparation according to p. 19, characterized in that the mixture of the first polyethylene and the second polyethylene is injected from 0.2 to 20% by weight of C3-C10-olefinic monomer unit.

21. The method of preparation under item 19 or 20, characterized in that the first operation before the specified second operation.

22. The method of preparation according to p. 21, wherein in the first operation using a number of MegaPAC is from 100 to 1000 g/10 min.

23. The method of preparation according to any one of paragraphs.19 to 22, characterized in that the said first and/or second operations are performed in the presence of a catalytic system comprising precatalysts based compounds of tetravalent titanium and socialization based organoaluminium connection.

24. The method of preparation by p. 23, characterized in that compounds of tetravalent titanium connection is selected TiCl4/MgCl2as organoaluminium compounds selected connection R3Al, where R1-C10alkyl, and the catalytic system further comprises an inert carrier, precatalysts with an internal electron-donor interaction and precatalysts with an external electron-donor interaction.

25. The method of preparation according to any one of paragraphs.19 to 24, characterized in that the catalytic system of the type specified in the first operation, and the same catalytic system is used in at least the specified second operation.

26. The method of preparation according to any one of paragraphs.19 to 25, characterized in that the said first and second operations are performed as suspension polymerization, gas phase polymerization or a combination of both.

27. Pic is how the polymerization of the gas phase.

28. The method of preparation according to any one of paragraphs.19 to 27, characterized in that this mixture is additionally processed in corrective action, including heat, melt processing and implementation of controlled free-radical reactions, obtaining the molecular weight is not less than the raw mixture, and molecular weight distribution which is wider than the raw mixture.

29. The method of preparation on p. 28, characterized in that this mixture is processed in the specified corrective action so that during this operation, the relative decrease in TP53, (TR53'- TP53): TP53where TR53'the melt index of this mixture, after the specified corrective surgery ranged from 5 to 100%.

30. The method of preparation according to p. 29, characterized in that this mixture is processed in the specified corrective action so that during the specified corrective action relative decrease in TR53- (TR53'- TP53): TP53where TR53'the melt index of this mixture, after the specified corrective surgery accounted for the3'NEG21/53) : OTP21/53where OTP21/53'- the ratio of Temecula melt this mixture, after the specified adjustment reactions, from 5 to 100%.

31. The method of preparation according to p. 29, characterized in that this mixture is processed in the specified corrective action so that during the specified corrective action relative expansion of the molecular weight distribution, expressed as +(OTP21/53'- OTP21/53) : OTP21/53where OTP21/53'- the ratio of Temecula melt this mixture, after the specified adjustment reactions ranged from 5 to 100%.

32. Method of coating a solid substrate by melt-coverts composition under item 1 on the basis of polyethylene, characterized in that as polyethylene using a multimodal polyethylene with a density of from 0,915 to 0,955 g/cm3which is a mixture of at least a first polyethylene, the first average molecular weight and the first molecular weight distribution, and the second polyethylene with a second average molecular weight greater than said first average molecular weight, and with a second molecular weight distribution, and the CME is the closure of a solid substrate by p. 32, wherein the multimodal polyethylene contains from 80 to 99.8% by weight of ethylene monomer units and from 0.2 to 20% by weight of C3-C10-olefinic monomer unit.

34. Method of coating a solid substrate under item 32 or 33, characterized in that the solid substrate using an iron or steel pipe, fitting or profile.

35. Method of coating a solid substrate according to any one of paragraphs.32 to 34, characterized in that on a solid substrate before the coating is applied primer type epoxy varnish and linking reagent type carboxylating polyethylene covering the specified primer.

 

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5 cl, 1 tbl

FIELD: chemistry; insulation.

SUBSTANCE: invention pertains to a cable with a coating layer, made from waste materials. The cable consists of at least, one conductor with at least one transfer element and at least one layer of coating. The coating material contains between 30 mass % and 90 mass % of the overal mass of the coating material, at least, first polyethylene with density not more than 0.940 g/cm3 and melt flow index from 0.05 g/10 min. to 2 g/10 min., measured at 190°C and a load of 2.16 kg in accordance with standard ASTM D1238-00, and quantity from 10 mass % to 70 mass % of the overall mass of the coating material, at least, second polyethylene with density of more than 0.940 g/cm3. The first polyethylene is obtained from waste material. Use of at least, one polyethylene with density of more than 0.940 g/cm3 in the recycled polyethylene allows for obtaining a layer of coating, capable of providing for mechanical characteristics, in particular, breaking stress and tensile strength, comparable to characteristics of primordial polyethylene. The stated coating layer is preferably used as an external protective coating.

EFFECT: obtaining of a new type of cable insulation.

43 cl, 9 dwg, 4 tbl, 10 ex

FIELD: chemistry.

SUBSTANCE: plastic composition with low viscosity, containing polyethylene with molecular mass of 1300-2700 - 100 pts.wt, and polyethylene with molecular mass of 1080-1250, or diesel fuel or engine oil instead of the latter - 10-20 pts. wt.

EFFECT: coating is water resistant, elastic, frost resistant, weather resistant and corrosion resistant.

2 tbl

FIELD: chemistry.

SUBSTANCE: composition with multimodal distribution of molecular weight has density between 0.94 and 0.95 g/cm3 at 23°C and melt flow index (MFI190/5) between 1.2-2.1 dg/min in accordance with ISO 1133. The composition contains 45-55 wt % low molecular weight homopolymer A of ethylene, 30-40 wt % high molecular weight copolymer B of ethylene and another olefin containing 4-8 carbon atoms, and 10-20 wt % ultrahigh molecular weight copolymer C of ethylene and another olefin containing 4-8 carbon atoms. The composition has high processibillity and resistance to mechanical loads and breaking, especially at temperatures below 0°C.

EFFECT: flawless coating for steel pips has mechanical strength properties combined with high hardness.

10 cl, 1 tbl, 1 ex

FIELD: chemistry.

SUBSTANCE: invention relates to tubes with a coating, having a high-mechanical strength layer of multimodal polyethylene. The tube has an inner surface, an outer surface layer (A) and a coating layer (B) covering said outer surface layer (A). The coating layer (B) contains a coating composition (B-2) which contains 80-100 wt % multimodal ethylene copolymer (B-1), having shear thinning index SHI2.7/210 from 10 to 100, where SHI2.7/210 is determined by shear frequency experiments in linear viscosity stress interval at frequencies from 0.05 to 300 rad/s according to ISO 6721-1 as a ratio of complex viscosity values η(2.7 kPa)/η(210 kPa), containing a multimodal ethylene copolymer (B-1), which is a copolymer of ethylene and one or more alpha-olefin comonomers, having 4-10 carbon atoms. The multimodal ethylene copolymer (B-1) also contains (B-1-1) 49-59 wt % low-molecular weight ethylene homopolymer component with respect to weight of the multimodal ethylene copolymer (B-1), wherein said component (B-1-1) has weight-average molecular weight from 5000 g/mol to 70000 g/mol and (B-1-2) from 51 to 41 wt % high-molecular weight ethylene copolymer component with respect to the weight of the multimodal ethylene copolymer (B-1), wherein said component (B-1-2) has weight-average molecular weight from 100000 g/mol to 700000 g/mol and the multimodal ethylene copolymer (B-1) has weight-average molecular weight from 70000 g/mol to 250000 g/mol and flow melt index MFR2, determined according to ISO 1133 at 190°C under a 2.16 kg load, from 0.05 g/10 min to 5 g/10 min, flow melt index MFR5, determined according to ISO 1133 at 190°C under a 5 kg load, from 0.5 g/10 min to 10 g/10 min, and density from 930 kg/m3 to 955 kg/m3; and ratio of weight-average molecular weight to number-average molecular weight Mw/Mn from 24 to 50. Said high-molecular weight ethylene copolymer component has weight-average molecular weight from 100000 g/mol to 700000 g/mol. The multimodal ethylene copolymer (B-1) has weight-average molecular weight from 70000 g/mol to 250000 g/mol and flow melt index MFR2, determined according to ISO 1133 at 190°C under a 2.16 kg load, from 0.05 g/10 min to 5 g/10 min, flow melt index MFR5, determined according to ISO 1133 at 190°C under a 5 kg load, from 0.5 g/10 min to 10 g/10 min, and density from 930 kg/m3 to 955 kg/m3, and ratio of weight-average molecular weight to number-average molecular weight Mw/Mn from 24 to 50.

EFFECT: coating can be applied on tubes with high output and cost-effectiveness; coating has good mechanical properties.

26 cl, 1 dwg, 2 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to tubes with a polymer coating and more specifically to coated metal tubes used at high temperatures. The tube has an inner surface, an outer surface layer (A) and a coating layer (B) covering said outer surface layer (A). The coating layer (B) contains a coating composition (B-2) which contains a multimodal ethylene copolymer (B-1) which is a copolymer of ethylene and one or more alpha-olefin comonomers with 6-10 carbon atoms. The multimodal ethylene copolymer (B-1) has weight-average molecular weight from 70000 g/mol to 250000 g/mol, and flow melt index STR2, determined according to ISO 1133 at 190°C and a 2.16 kg load, from 0.05 g/10 min to 5 g/10 min, flow melt index STR5, determined according to ISO 1133 at 190°C and a 5 kg load, from 0.5 g/10 min to 10 g/10 min. Density of said multimodal ethylene copolymer (B-1) ranges from 946 kg/m3 to 956 kg/m3. The coating composition (B-2) contains 80-100 wt % multimodal ethylene copolymer (B-1) with respect to total weight of the coating composition (B-2). The invention also relates to a method of making a coated tube. Coating composition (B-2) is deposited on a tube having an outer surface layer (A) to form a coating layer (B).

EFFECT: obtaining a coated tube, where the coating has high hardness, good properties at high temperatures and acceptable cracking properties under stress.

33 cl, 1 dwg, 2 tbl

FIELD: construction.

SUBSTANCE: pipe comprises an inner surface, an outer surface layer (A) and a coating layer (B), coated with the above outer surface layer (A). The coating layer (B) contains a coating composition (B-2), including a multimodal copolymer of ethylene (B-1). The multimodal copolymer of ethylene (B-1) is a copolymer of ethylene and one or more comonomers of alpha-olefins having from 4 to 10 atoms of carbon and has an average weighted molecular mass from 70000 g/mole to 250000 g/mole, the ratio of the average weighted molecular mass to the number average molecular weight, Mw/Mn, from 15 to 50, melt index MFR2, determined in compliance with ISO 1133 at 190°C and the load of 2.16 kg, from 0.05 g/10 min to 5 g/10 min, melt index MFR5, determined in accordance with ISO 1133 at 190°C and the load of 5 kg, from 0.5 to 10 g/10 min, the density from 930 kg/m3 to 955 kg/m3.

EFFECT: pipes with coating have higher mechanical strength and may be manufactured with high throughput capacity and high efficiency of production.

30 cl, 1 dwg, 2 tbl

FIELD: construction.

SUBSTANCE: pipe comprises an inner surface, an outer surface layer (A) and a coating layer (B), coating the above outer surface layer (A). The coating layer (B) contains a coating composition (B-2), with a wear resistance ratio of 30 at the highest, and including a multimodal ethylene copolymer (B-1). The multimodal copolymer of ethylene (B-1) is a copolymer of ethylene and one or more alpha-olefin comonomers containing from 6 to 10 atoms of carbon and has an average weighted molecular mass from 70000 g/mole to 250000 g/mole, the melt index MFR2 determined in compliance with ISO 1133 at 190 °C and the load of 2.16 kg, from 0.05 g/10 min to 5 g/10 min, melt index MFR5, determined in accordance with ISO 1133 at 190 °C and the load of 5 kg, from 0.5 to 10 g/min, density from 930 kg/m3 to 950 kg/m3 and the ratio of the average weighted molecular mass to the number average molecular weight, Mw/Mn, from 15 to 50.

EFFECT: coated pipes have improved mechanical properties, for instance, very high resistance to cracking under stress, pipes may be coated with high efficiency and good cost-effectiveness of production.

28 cl, 1 dwg, 2 tbl

FIELD: chemistry.

SUBSTANCE: described is an electroconductive thermoplastic material for electrotyping, which contains a binding substance and electroconductive filler, where the binding substance is a mixture of polyethylene wax and paraffin in ratio of 2/1 to 1/3, and the electroconductive filler is graphite, with the following ratio of components, pts.wt: polyethylene wax 10-20, paraffin 10-30, graphite 60-70.

EFFECT: material enables free casting of an original article with electroconductive material when making a mould at low temperature and simplifies the technology of making moulds.

1 tbl, 1 ex

FIELD: chemistry.

SUBSTANCE: method of producing nanostructured polymer composite coating material involves mixing polyethylene and montmorillonite master-batch obtained beforehand via organo-modification of montmorillonite and addition thereof to a polymer, in a twin-screw extruder with unidirectional rotation at a temperature which enables polyethylene to melt, followed by extrusion of the obtained material.

EFFECT: invention increases cracking resistance the material, corrosion resistance, heat resistance, frost resistance, wear resistance, abrasion resistance, adhesion of the coating to substrate material, improves uniformity of distribution of montmorillonite particles in the polymer matrix.

5 cl, 1 ex

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