External polyurethane two-component protective coating (versions)

FIELD: chemistry.

SUBSTANCE: invention relates to pipeline construction and is used in field and basic conditions when laying underground main pipelines for protection thereof from corrosion, mechanical damage and during construction of gas or liquid transporting field and industrial pipelines in conditions of permanently frozen soil, when laying pipelines on swamps, on waterlogged areas, particularly for repairing anti-corrosion coatings of oil pipelines, oil product pipeline and gas pipelines during repair thereof in field conditions, including without stopping transportation of the product, and during corrosion protection of piping of compressor stations at pipeline temperature of 70-90°C, on a section of a pipeline transporting gas at temperature above zero after a compressor station, e.g. at a section of a discharge line transporting compressed gas at temperature of plus 40°C. Versions of anti-corrosion paint for obtaining an external polyurethane two-component protective coating are given. The paint is obtained by mixing component A and component B - polyisocyanate based on diphenyl methane diisocyanate with equivalent mass of 131-135. Component A is a suspension of substances in a hydroxyl-containing polyatomic alcohol with ether and ester bonds with equivalent mass of 230….250.

EFFECT: providing high rate of hardening of the coating with improved protective properties thereof, which prevents development of underfilm and stress corrosion on the pipeline for a period of time comparable with the life of the pipeline.

6 cl

 

The group of inventions relates to the construction of pipeline transport and is used in route conditions for laying underground pipelines to protect them from corrosion, mechanical damage, as well as in the construction of the transporting gas or liquid commercial and industrial pipelines in terms of the distribution of permafrost, for laying pipelines in the swamps, flooded areas, in particular to restore corrosion protection coatings of oil pipelines, oil pipelines and gas pipelines in the course of overhaul in route conditions, including without stopping the transport of the product, as well as the protection from corrosion of piping and compressor stations at temperatures pipelines 70-90°C, on the site of the pipeline, transporting gas with a positive temperature after compressor station, for example, in the area of discharge plume transporting compressed gas with a temperature of + 40°C.

The prior art material used in the process pipe insulation thermoplastic resin, which consists in applying to the outer surface of the pipeline, after her purification, primer and melt mastic using a wrapping layer. The disadvantages of this method are the high energy method and the necessity in support of mastic to 200°C and the heating surface of the pipeline. When using bitumen-polymer mastics need reinforcement insulating layer mesh to prevent runoff of mastic from the walls of the pipeline. In addition, the service life of bituminous coatings does not exceed 15 years, which is 2 times less than the service life of pipelines. The known method is characterized by low productivity and a large number of used vehicles (up to 21 units). Note that bitumen-polymer mastic fire and toxic when they are applying (see EN 2005105440/06(006826), 28.02.2005).

A well-known material used in the implementation of the method of protection against corrosion in the base and route conditions tacky polymeric tapes of PVC or polyethylene, as well as heat-shrinkable tapes, in which the coating is applied manually on short sections of pipelines (EN 2151942 C1, 27.06.2000).

The disadvantages of this method are:

- high requirements for surface preparation;

- the necessity of heating pipeline in some cases up to 30-50°C regardless of ambient temperature;

- the presence of a tent effect (voids) in the area of welds;

- life coverage is 7-14 years, much less than the lifetime of the pipeline;

- relatively high cost of coverage.

Known steel tube with a protective coating its inner surface sediments and is Orosei, used in which the two-component composition based on polyurethane binder with a mixing ratio from 1:5 to 5:1 (see EN 92509, 20.03.2010). Part two-component compositions based on polyurethane binder comprises: (a) polyol (resin), b) polyisocyanate (curing agent).

In the curing process of the coating is the polymerization of components due to airborne moisture and residual moisture on the inner wall of the pipe.

A disadvantage of the known solutions is the requirement of the presence of moisture on the prepared pipe surface, the dependence of the curing of the coating from the state of humidity of the atmosphere at the time of coating, which leads to uncontrolled process for coating the surface of the steel pipeline. It is known that, in order to avoid corrosion on the prepared outer surface of the pipeline, it is forbidden to apply coating on his wet outer surface, with a gap in time between cleaning of the surface of the pipeline and the application of a coating should be minimal and should not exceed two hours. Failure to meet these requirements the process of cleaning the surface of the pipeline repeat.

Closest to the claimed invention is a known compound for obtaining thermally stable and compatible with cathodic protection coatings, VK is uchumi solvent reactive two-component polyurethane system (see EN 2278139 C2, 20.06.2006). Known from the prior art composition is used for corrosion protection of pipes and ballast tanks of ships, the thickness of the coating layer when it exceeds 1000 μm.

In the known solution component And consists of 40-100 wt.% simple polyetherpolyols with functionality >3.5 and a molecular weight 280-1000 or mixtures of several such components, and 0-60 wt.% simple proliferatoractivated from 5.0 to 15 wt.% hydroxyl groups and a viscosity at 23°C from 300 to 5000 MPa·s, and 0-60 wt.% other containing hydroxyl group of compounds with a molecular weight of from 32 to 1000, and the sum of the wt.% substances component is always equal 100%.

Component consists of at least one organic MDI, and the equivalent ratio of NCO:OH is in the range from 0.8:1 to 1.5:1.

In the case of the component In we can talk about aromatic organic polyisocyanate. A disadvantage of the known solutions is the lack of elasticity of the coating due to the lack of hydroxysteroid compounds (simple proliferatoractivated and the other containing the hydroxyl group of compounds with a molecular weight of from 32 to 1000)as specified lower limit their content in the component And is equal to zero, and insufficient wettability of the composition and the degree of its content. During the deposition of the coating on the curved surface of the pipe with the wire due to the short viability of the composition and the lack of wettability on the edges of the spray (thinner layer) curing the coating occurs more intensively with the formation of "shagreen leather", what is marriage in the coating.

The invention solves the problem of improving the protective properties of the coating of the steel pipe by eliminating development sub pellicle and stress-corrosion on the pipeline in a period of time comparable to the lifetime of the pipeline.

In addition, the proposed outer two-component polyurethane protective coating provides comprehensive automation of the process of applying to the outer surface of the pipeline protective coating so-called combined method insulation works representing a single technological complex, uniting in one continuous stream all the components of its operations: cleaning of the outer surface of the pipeline with dehumidification and heating (if necessary), application of external insulation, pipe in the trench, the backfill.

Option two-component polyurethane protective coating has a thermal stability at temperatures of 70-90°With simultaneous compatibility with cathodic protection and, in addition, can be used during repair operations, when applied coating by airless spray using a hand gun on a pipeline with a surface temperature of from 40 to 90°C.

Achievable technical re is the query result when implementing the claimed group of inventions is getting in route conditions of the coating with desired corrosion resistance and dielectric properties, high gasoline, atmosferoustojchivosti, abrasion resistance, longer service life coverage is comparable to the lifetime of the new pipeline, as well as improving the performance of the coating process a considerable thickness on the pipeline route conditions, including large diameter (1200 mm and more), due to automation and synchronization performance of the preparation processes of the outer surface of the pipeline and applying coatings. Possible use of the claimed coating in basic terms.

This task is solved in that the outer two-component polyurethane protective coating is a corrosion-resistant paint, which are mixed before use, containing the polyurethane mixture of component a and component B is a polyisocyanate-based diphenylmethanediisocyanate with an equivalent weight of 131...135 are in the ratio, about. including 3:1, respectively, while the component a is a suspension of substances in the hydroxyl-containing polyhydric alcohol with ether and ester bonds with an equivalent weight of 230...250 received in the course of their dispersion according to the recipe, wt.%:

hydroxyl-containing polyhydric alcohol with p is ostime and
ester bonds with an equivalent weight of 230...25010...50
extensive polisport containing simple and complex
ether group or a simple linear polyol
based on polypropylene ether20, not less than
inorganic pigments4, no more than
titanium dioxide8...12
barite10...25
talc5...15
the solution banaraswala polymers0,5...2
molecular sieve 3A5...10
substituted aromatic diamine
the equivalent of NH 90 (i.e. 80-100)0,6...1,2
tertiary amine with a hydroxyl number of 560 mg KOH/g0,5...1
the solution alkylammonium the Oh acid salt copolymer,
containing a hydroxyl functional group0,25...1,

the distribution of particle sizes mikrofraktsy is

barite, 3 ám %50
barite, 10 ám %50

In addition, when the protection from corrosion of piping and compressor stations with temperature pipeline 70-90°C in the pipeline, transporting gas from the positive temperature after compressor station, for example at the site discharge plume transporting compressed gas with a temperature of + 40°C, and/or in the coating process manually by airless spray, when needed over the long-term viability of composition and increased wettability of the outer surface of the pipeline, the above task is solved by a variant of the invention, the outer two-component polyurethane protective coating, which is a corrosion-resistant paint, which are mixed before use, containing the polyurethane mixture of component a and component B the polyisocyanate-based diphenylmethanediisocyanate with an equivalent weight of 131...135 are in the ratio, the b. including 3:1, respectively, while component a is a suspension of substances in the hydroxyl-containing polyhydric alcohol with ether and ester bonds with an equivalent weight of 230...250 received in the course of their dispersion according to the recipe, wt.%:

hydroxyl-containing polyhydric alcohol with a simple and
ester bonds with an equivalent weight of 230...25010...50
extensive polisport containing simple and complex
ether group or a simple linear polyol
based on polypropylene ether20, not less than
inorganic pigments4, no more than
titanium dioxide8...12
barite10...25
talc5...15
the solution banaraswala polymers0,5...2
mole is ulamaa sieve 3A 5...10
substituted aromatic diamine
the equivalent of NH 900,6...1,2
tertiary amine with a hydroxyl number of 560 mg KOH/g0,5...1
the solution alkylammonium acid salt copolymer,
containing a hydroxyl functional group1,0...1,5,

the distribution of particle sizes mikrofraktsy is

barite, 3 ám %100
talc, 7 μm %100

In addition, in certain cases, complete coverage of molecular sieve contained in the form of a homogeneous dispersion, for example, 50% molecular sieve in castor oil, and inorganic pigments represented by iron oxide and chromium oxide.

To give the necessary elasticity to the stated floor is used as a binder hydroxyl-containing polyhydric alcohol with ether and ester bonds with an equivalent weight of 230...250, and as an added binder is th used hydroxyl-containing compound with an equivalent weight of 340...1000 - extensive polisport containing simple and complex ether grouping, simple linear polyol based on polypropylene ether. At the same time as component B using a polyisocyanate based on difenilmetana-diisocyanate with an equivalent weight of 131...135. These materials provide the chemical curing of the coating (the stitching) by the process of polymerization, i.e. their transformation from liquid to solid three-dimensional cross-linked state with the formation of the polymer frame. These transformations caused by the growth of macromolecules, education stitched spatial frame due to intermolecular interaction between individual functional groups (hydroxyl and other chemical capable of interacting groups) of these components. During curing of the coating components are formed functional groups capable of interaction with the surface of the steel pipe that provides a high degree of adhesion and the desired strength of the coating.

Entered additives improve the properties of the formed polymer frame, cover density, and elasticity.

Adding talc with scaly form of microparticles as filler improves the resistance of the coating to ultraviolet rays, add Inoi "barrier" protection against gas diffusion and water vapor, to increase adhesion of the material to the substrate and interlayer adhesion.

Microparticles barite improve the adhesion to the substrate, the coating has the necessary moisture and vapor permeability and high resistance to corrosive environments, weathering and high temperatures.

The use of colored pigments inorganic pigments composition in addition to color more opacity and protects the floor from photodegradation. Solid particles of inorganic iron oxide pigments, especially needle and flake forms, structure and reinforced floor, increase its strength, hardness, water and weather resistance and chemically protect the pipeline from corrosion.

As antifoam applied solution banaraswala polymers - A Byk 530.

As the adsorption of the additive used molecular sieves 3A in the form of a homogeneous dispersion (50% molecular sieve in castor oil), which greatly facilitates the manufacturing process.

As a thixotropic additive to prevent dripping of the coating in a thick layer with a curved surface of the pipeline used substituted aromatic diamine with an NH equivalent of nearly 90 Hardener DT.

As the catalyst used tertiary amine with a hydroxyl number of 560 mg KOH/g - Dbco 33 LV.

As hydroxyl-containing polyhydric alcohol with ether and ester linkages - Desmophen 1145.

As branched polisport containing ether and ester groups, or a simple linear polyol based on polypropylene ether - Desmophen 1150.

As a solution alkylammonium acid salt of a copolymer containing a hydroxyl functional group - Byk W969.

As component B - polyisocyanate-based diphenylmethanediisocyanate with the equivalent mass 131-135 - Desmodur VL.

Wetting agent is a solution of alkylammonium acid salt copolymer containing hydroxyl functional groups that increase the speed of wetting and dispersion of fillers and also reduces the viscosity of the composition and provides a higher degree of its content.

The outer two-component polyurethane coating is applied to the pipeline by airless spray mixture in the implementation of separate heating component (component a - 50-60°C, and component B is at 30-40°C) and feed components separate pumps when connecting components a and B in the given proportion of the mixer on the spray head. The spray mixture can be produced using the spray gun high-pressure manual napalan and or using equipment for automatic coating. The curing time of the coating "to touch" at an ambient temperature of 25°C is 12-15 minutes 30 minutes possible between the transport of articles with the coating. Start of operation of the products coated maybe 3 hours after spraying. The full cure time of the coating two days.

Examples of use of the invention.

The outer two-component polyurethane coating (trade mark RCP-1001) is applied on the prepared outer surface of the steel pipeline route conditions in the form of a continuous layer. The components are heated, mixed, and a coating lead by airless spray in the automatic mode of evenly spaced around the circumference of the pipe bands using a device that contains two of the spray gun high pressure. The device provides oscillating in the transverse and continuous movement in a longitudinal direction with respect to the pipeline. When the coating through the nozzle of each of the specified pistol form a flat fine torch with less saturated zone dispersion of coating material on the periphery, thus providing partial in the circumferential direction overlapping ends of these bands with the formation of a uniform coating thickness, and each specified torch Orient perpe dicosmo the outer surface of the pipeline, thus the plane of the torch is directed along the generatrix of the pipe. When using the heated components of the coating reduces the loss, in addition, due to the reduction in the heating of the surface tension and viscosity of the opportunity to spray the material at a much lower pressure and is provided with the desired curing rate of the coating (to "tack-free") by the polymerization of the coating strips of each. The gradual decrease in the saturation of the sprayed material on the edges of the strip to avoid stains and thickness variation of the coating when applying one stripe to another. The frequency of double vibrations carrying pistols rotor is 5-10 per minute.

The width of the stripes of coating material, they depend on the diameter of the insulated pipe, the required performance of the process and are provided with a number of spray guns, high pressure, angle of inclination of the axis of the nozzle of the spray guns in relation to the longitudinal axis of the translational motion of the device containing the specified pistols, as well as a selection of oscillatory and translational velocities of their motion.

For example, the performance of the coating on the pipeline with a diameter of 1020 mm is 0.5-0.7 linear m/min, the Flow rate of the coating material RPU-1001 sostav the et at a coating thickness of 1 mm the 2.4...2.5 kg/m2at a coating thickness of 2 mm to 4.5...4.9 kg/m2.

The field trials showed that used for isolation of the pipeline according to the invention the material of the outer two-component polyurethane protective coating (RCP-1001), the modes of its application and used the device to provide the coating with the necessary adhesion, high physical mehanicheskij properties, in particular high resistance to abrasion and corrosion resistance, which is important in the operation of underground pipelines, subject to the operational movements.

Improving the reliability of the outer protective coating of the pipeline due to the high protective properties of the coating, which eliminates the development of sub pellicle and stress-corrosion on the pipeline in a period of time comparable to the lifetime of the pipeline.

1. The outer two-component polyurethane protective coating, which represents an anticorrosive paint, which are mixed before use, containing the polyurethane mixture of component a and component B is a polyisocyanate-based diphenylmethanediisocyanate with an equivalent weight of 131...135 are in the ratio, OBC 3:1, respectively, while component a is a suspension of substances in the hydroxyl-containing polyhydric alcohol with a question is diversified and ester bonds with an equivalent weight of 230...250, obtained in the course of their dispersion according to the recipe, wt.%:

hydroxyl-containing polyhydric alcohol
with ether and ester bonds
the equivalent weight of 230...25010...50
extensive polisport containing
simple and complex broadcasting
grouping or a simple linear polyol
based on polypropylene etherat least 20
inorganic pigmentsnot more than 4
titanium dioxide8...12
barite10...25
talc5...15
the solution banaraswala polymers0,5...2
molecular sieve 3A5...10
substituted aromatic diamine
the equivalent of NH 900,6...1,2
tertiary amine with a hydroxyl number of 560 mg KOH/g0,5...1
the solution alkylammonium acid salt copolymer,
containing a hydroxyl functional group0,25...1,

the distribution of particle sizes mikrofraktsy is
barite, 3 ám %50
barite, 10 ám %50
talc, 7 μm %100

2. The coating according to claim 1, in which the molecular sieve contained in the form of a homogeneous dispersion, for example, 50% molecular sieve in castor oil.

3. The coating according to claim 1, in which the inorganic pigments represented by iron oxide and chromium oxide.

4. The outer two-component polyurethane protective coating, which represents an anticorrosive paint, which are mixed before use, containing the polyurethane mixture of component a and component B - polisiya is at on the basis of diphenylmethanediisocyanate with an equivalent weight of 131...135 are in the ratio, obj 3:1, respectively, while component a is a suspension of substances in the hydroxyl-containing polyhydric alcohol with ether and ester bonds with an equivalent weight of 230...250 received in the course of their dispersion according to the recipe, wt.%:

hydroxyl-containing polyhydric alcohol
with ether and ester bonds
the equivalent weight of 230...25010...50
extensive polisport containing simple
and complex ether grouping or
simple linear polyol-based
polypropylene etherat least 20
inorganic pigmentsnot more than 4
titanium dioxide8...12
barite10...25
talc5...15
the solution banaraswala polymers0,5...2
molecular sieve 3A5...10
substituted aromatic diamine
the equivalent of NH 900,6...1,2
tertiary amine with a hydroxyl number of 560 mg KOH/g0,5...1
the solution alkylammonium acid salt copolymer,
containing a hydroxyl functional group0,25...1,

the distribution of particle sizes mikrofraktsy is
barite, 3 ám %100
talc, 7 μm %100

5. The coating according to claim 4, in which the molecular sieve contained in the form of a homogeneous dispersion, for example, 50% molecular sieve in castor oil.

6. The coating according to claim 4, in which the inorganic pigments represented by iron oxide and chromium oxide.



 

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FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing self-curing polyurethane dispersions, use thereof as coating agents, coating agents containing these self-curing aqueous dispersions, a method of coating substrates, as well as substrates treated with coating agents. The method of producing self-curing aqueous polyurethane dispersions involves the following steps: I. reacting al) polyisocyanate with a mixture of, a2) 2,2-bis(hydroxymethyl)alkanecarboxylic acid as an anionic hydrophilisation agent containing a group which is reactive towards isocyanate and, a3) at least one polyol component with average OH-functionality >1, wherein any mixture from a2) and a3), or component a1) k) contains at least one catalyst selected from a group consisting of tertiary amines, tin, zinc or bismuth compounds; II obtaining an OH-functional polyurethane without NCO-groups from step I, which then; III. a4) is mixed with a reactive blocking agent for isocyanate groups, selected from a group consisting of butanone oxime, diisopropylamine or tert-butylbenzylamine, 3,5-dimethylpyrazole, triazole, respectively, mixture thereof; IV. subsequent reaction of that mixture from step III with a5) one or more polyisocyanates selected from group a1), wherein these polyisocyanates are the same as or are different from al), and subsequent V. obtaining a physical mixture of OH-functional polyurethane without NCO-groups and a blocked polyisocyanate from step IV, after which after either; VI. acid groups of OH-functional polyurethane a6) are completely or partially deprotonated by adding a neutralising agent; VII. and the polyurethane obtained at step VI id dispersed in water, or step VII is carried out before step VI.

EFFECT: obtaining self-curing aqueous polyurethane dispersions containing negligible amounts of cosolvent.

14 cl, 1 tbl, 5 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing coating material. Disclosed is a method of producing coating material in form of powdered lacquer or a fluid resin, characterised by that one or more alcohols or polyols react with one or more silanes selected from a group consisting of (isocyanatomethyl)methyl-dimethoxysilane, 3-isocyanatopropyl-trimethoxysilane and 3-isocyanatopropyl-triethoxysilane, to form a covalent bond between the alcohol or polyol and the silane such that the reaction product is a high-molecular weight silane which is cured directly using a catalyst, wherein all alcohol or polyol organic functional groups participate in the reaction with the silane organic functional group. Coating material and use thereof are also disclosed.

EFFECT: disclosed method enables to obtain coating material which can be used to make scratch-resistant coatings.

12 cl, 4 ex

FIELD: chemistry.

SUBSTANCE: invention relates to rocket engineering, particularly to production of a protective-adhesive lacquer which is used as a primer for binding an inhibiting coating with the surface of the charge when inhibiting solid-propellant charge. The protective-adhesive lacquer contains 4,4',4"-triphenylmethane triisocyanate, dichloroethane, as an adhesive additive - a product of polycondensation of ethylene glycol, adipic acid and glycerine, with content of hydroxyl groups from 2.00 to 2.30 wt % and dibutyltin dilaurate as a curing agent.

EFFECT: obtaining lacquer with high capacity for protection from migration processes in the "fuel-inhibiting coating" system, which reduces smoke formation, increases adhesion strength between the inhibiting coating and the surface of the propellant charge, which contains polyformaldehyde derivative-based components, avoids use of an additional cellulose acetate-based primer, which ensures strong adhesion of solid-propellant charge pellets with the inhibiting coating for the guaranteed storage life of the charge and which enables to use readily available domestic raw materials.

1 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to polymeric heat-reflecting coating compositions which are applied on inflatable structures, protective and rescue equipment (airstairs for civil aviation, floatation rafts, airships, pneumatic tents, heat-reflecting screens, shields for firefighters), consisting of airtight elastic material based on fabric (capron, nylon, lavsan, high-strength aramid fibre SVM). The polymeric heat-reflecting coating composition contains urethane rubber, a hardener, aluminium paste and ethyl acetate.

EFFECT: production of cold-curable polymeric heat-reflecting coating composition, having high resistance to thermal radiation (up to 29 kW/m2) and minimum weight gain (thickness).

3 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to thermally solidificated covering substances based on aprotic solvents. Claimed is covering substance, which contains at least one compound (A), which contains hydroxyl groups, at least one compound (B) with free and/or blocked isocyanate groups, and at least one catalyst (D) for cross-linking silane groups, with one (i) or several components of covering substance containing hydrolysed silane groups and (ii) covering substance can be finally solidificated for covering, which has statistically distributed regions of lattice Si-O-Si. Obtained from covering substance solidificated coating has index of further cross-linking (PCI) lower than 2, with index of the further linking (PCI) being determined as coefficient from memory module E'(200) of finally solidificated coating, measured at 200°C, to minimum of memory module E'(min) of finally solidificated covering, measured at temperature higher than temperature of transition into glass-like state of Tg, and memory modules E'(200) and E'(min),as well as temperature of transition into glass-like state Tg are measured on free films with thickness of layer 40 mcm+/-10 mcm by means of dynamic mechanical thermal analysis (=DMTA) at rate of heating 2 K per minute and frequency 1 Hz and DMTA measurement on free films with thickness of layer 40 mcm+/-10 mcm, which are solidificated for 20 minutes at object temperature 140°C and after solidifying are kept for 8 days at 25°C, before carrying out DMTA measurements. Polyisocyanate (B) at least partially has one or several similar or different structural units of formula -X-Si-R"XG3-X, where G = identical or different hydrolysed groups, in particular alcoxy group, X=organic residue with from 1 to 20 carbon atoms, R" =alkyl, cycloalkyl, aryl or aralkyl, and carbon chain can be broken by non-adjacent oxygen groups, sulphur or NRa, with Ra=alkyl, cycloalkyl, aryl or aralkyl, x=0 to 2. Catalyst (D) is phosphorus-containing, and covering substance contains catalyst (D) from 0.1 to 10 wt % in terms of non-volatile components of covering substance. Also claimed are multi-step method of applying coating with application of claimed covering substance, as well as application of claimed method and versions of claimed coating application.

EFFECT: possibility to obtain transparent varnish coating with high resistance to atmospheric impact.

18 cl, 4 tbl, 7 ex

FIELD: chemistry.

SUBSTANCE: invention relates to thermally solidificated covering substances based on aprotic solvent. Claimed is covering substance, which contains at least one compound (A), containing hydroxyl groups, at least one compound (B), containing isocyanate groups, and at least one phosphorus-containing catalyst (D) for cross-linking silane groups, with one or several components of covering substance containing between 2.5 and 97.5 mole %, counted for totality of structural units -N(X-SiR"x(OR')3-x)n(X'-SiR"y(OR')3-y)m (II) and -Z-(X-SiR"x(OR')3-x) (III), at least one structural unit of formula (II), where R'=hydrogen, alkyl or cycloalkyl, carbon chain can be interrupted by means of non-adjacent groups of oxygen, sulphur or NRa, with Ra= alkyl, cycloalkyl, aryl or aralkyl, X,X'=linear and/or branched alkylene pr cycloalkylene residue with from 1 to 20 carbon atoms, R" =alkyl, cycloalkyl, aryl or aralkyl, and carbon chain can be interrupted by means of non-adjacent groups of oxygen, sulphur or NRa, with Ra= alkyl, cycloalkyl, aryl or aralkyl, preferably R"=alkyl residue, n=0 to 2, m=0 to 2, m+n=2, x,y=0 to 2; and between 2.5 and 97.5 mole %, counted per totality of structural units (II) and (III), at least one structural unit of formula (III), where Z=-NH-, -NR-, -O-, R=alkyl, cycloalkyl, aryl or aralkyl, and carbon chain can be interrupted by means of non-adjacent groups of oxygen, sulphur or NRa, with Ra= alkyl, cycloalkyl, aryl or aralkyl, x=0 to 2, and X, R', R" have value, given above, and covering substance can be finally solidificated before covering, which has statistically distributed regions of lattice Si-O-Si. Also claimed are multi-step method of applying coating with application of claimed covering substance, as well as application of claimed method and versions of claimed coating application.

EFFECT: possibility to obtain transparent varnish coating with high resistance to formation of cracks under atmospheric impact and perfect resistance to scratching.

18 cl, 4 tbl, 7 ex

FIELD: chemistry.

SUBSTANCE: invention relates to thermally solidificated covering substances based on aprotic solvent. Claimed is covering substance, which contains at least one compound (A), containing hydroxyl groups, and at least one compound (B), containing isocyanate groups, and one or several components of covering substance have between 2.5 and 97.5 mole % counted per totality of structural units (I) and (II), at least one structural unit of formula (I), where R'=hydrogen, alkyl or cycloalkyl, and carbon chain can be interrupted by non-adjacent groups of oxygen, sulphur or NRa, with Ra= alkyl, cycloalkyl, aryl or aralkyl, X,X'=linear and/or branched alkylene or cycloalkylene residue with from 1 to 20 carbon atoms; R"= alkyl, cycloalkyl, aryl or aralkyl, and carbon chain can be interrupted by non-adjacent groups of oxygen, sulphur or NRa, with Ra= alkyl, cycloalkyl, aryl or aralkyl, n=0 to 2, m=0 to 2, m+n=2, x,y=0 to 2; and between 2.5 and 97.5 mole % counted per totality of structural units (I) and (II), at least one structural unit of formula (II), where Z=-NH-, -NR-, -O-; R=hydrogen, alkyl, cycloalkyl, aryl or aralkyl and carbon chain can be interrupted by non-adjacent groups of oxygen, sulphur or NRa, with Ra= alkyl, cycloalkyl, aryl or aralkyl, x=0 to 2, and X, R', R" have value, given above; and polyol (A) contains at least one poly(meth)acrylate polyol. Also claimed are multi-step method of applying coating with application of said covering substance, method application and versions of coating application.

EFFECT: possibility of simple obtaining of transparent varnish coatings with high resistance to crack formation under atmospheric impact and perfect resistance to scratching, which do not cause any ecological problems.

15 cl, 2 tbl, 4 ex

FIELD: optical engineering.

SUBSTANCE: invention, in particular, relates to UV solidifying composition based on urethane acrylates and containing 6.0-19.3 wt parts of hydroxyalkylacrylate and 1-5 wt parts of light initiator, said urethane acrylate base being mixture of 30.0-82.0 wt parts of interaction product of poly(oxypropylene glycol), 2,4-tolylenediisocyanate, hydroxypropyl acrylate, and 1,2-propylene glycol [molar ratio (1-2):(2-3):(2-2.1):(0.003-0.33)] with 4.7-60.0 wt parts of interaction product of 2,4-tolylenediisocyanate, hydroxypropyl acrylate, and 1,2-propylene glycol [molar ratio 1:(2.5:(0.004-0.065)]. Fiber light guide consisting of quartz optical fiber enrobed by above-defined composition is further described. Loss of light in light guide is thus lowered to 0.42-0.23 dB/km. Rupture strength is thus increased by 7.0 GPa.

EFFECT: increased rupture strength and reduced light loss.

2 cl, 1 tbl, 8 ex

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