Polymeric heat-reflecting coating composition
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).
The invention relates to polymeric heat-reflective compositions for coatings that are applied to inflatable structures, protective and rescue equipment (ladders civil aircraft, rafts, airships, inflatable hangars, heat-reflecting screens, shields for firefighters), consisting of an airtight elastic material based fabrics (rayon, nylon, polyester, high strength aramid fiber RAS).
Known polymer composition for coating comprising in parts by weight:
polyacrylate - 100;
Aerosil - 3,0-5,0;
the hydrate of aluminum oxide - 3,0-10,0;
hardener - 2,0-5,0.
As the hardener used methyltriacetoxysilane and/or ethyltriethoxysilane with the addition of tin. The composition is applied to the tissue from highly durable fibers for the manufacture of fire-resistant material. The drying temperature of the coating 170-220°C (RF patent No. 2210648).
The lack of a composition for coating is a large gain from coverage (more than 55 g/m2), as well as high-temperature drying of the coating, which is unacceptable for large-scale structures.
Known fluoropolymer composition for heat-reflecting coating curing at room temperature for no more than 24 hours, containing the product of the graft modification of fluorocarbon polymer and a crosslinking agent (U.S. patent No. 3.048.261).
A disadvantage of known composition is low and gesia to tanaleon materials impregnated based urethane rubbers.
Known teplootrazhayuschy epoxy composition for coating, a modified polyacrylate copolymer. As the filler used hollow glass microspheres (patent PRC No. 1434063).
The disadvantage of this composition is that it is not recommended to protect kanalizacija material from heat exposure and has a gain of more than 100 g/m2.
The closest adopted for the prototype, is a polymeric composition for heat-reflecting coatings on the outer side of the flexible fabric aircraft rescue ladder, inclusive, parts by weight: urethane rubber is 50, isocyanate - 4,5, plastimedical - 50, aluminum filler - 37.5 and solvent - 185 (U.S. patent No. 5.542.629).
The filler used aluminum powder.
As solvent - Thinner With 25/90 s
As a hardener - isocyanat brand ISOCYANATE 0626.
The disadvantages of the prototype is that the heat-reflecting coating has a low resistance to thermal radiation: when the power of the heat flow is not more than 2.0 Btu/ft2/sec (17 kW/m2after 15 minutes the color of the heat-reflecting coating is changed to brown, indicating a significant change in the reflection characteristics and gain from the heat-reflecting coating is 110 g/m2.
Technical task from which retene is the creation of a polymer composition for heat-reflecting coating of cold hardening, high resistance to thermal radiation (up to 29 kW/m2and minimum weight (thickness).
To achieve the technical objectives of the proposed polymer composition for heat-reflecting coating comprising a urethane rubber, a curing agent, an aluminum filler and a solvent, characterized in that as the curing agent contains a mixture of diphenylmethanediisocyanate and MDI as aluminum filler - aluminum paste, the solvent is ethyl acetate, in the following ratio of components, parts by weight:
|the ethyl acetate||155-375|
As a hardener urethane rubber is used a mixture of diphenyl-mechanisation and MDI with a ratio of (50-60)÷(40-50) (TU 113-03-38-106-90), which gives high adhesion of the coating to tanaleon materials impregnated based urethane rubbers.
As aluminum filler used aluminum paste for teplootrazhayuschy the x coatings (TU 1-595-15-1143) with the reflection coefficient R s(in the range of 0.3-2.4 μm) of not less than 0,80 and gloss of not less than 80 services. units with gloss Picogloss 560 (angle measuring 60°), and PPV (coverage water) of 1.3-1.8 m2/g, high reflective characteristics which provide high resistance to thermal radiation effect.
As the organic solvent used in ethyl acetate (GOST 8981)having a surface tension of >24 MKN/m and, unlike other solvents, providing 100%uspevaemosti aluminum paste.
Examples of implementation
In a mixer to prepare a 25%solution of urethane rubber SKU-8A (TU 38.103.209) with a molecular mass of 16000-18000: to 25 parts by weight of rubber added 75 parts by weight of ethyl acetate and working stirrer and a temperature of 60°C and reduce the mixture until complete dissolution.
Polymer teplootrazhayuschy composition prepared immediately before coating. To 100 parts by weight of a 25%solution of urethane rubber and 2.5 parts by weight of hardener added 29 parts by weight of aluminum paste (60%conc. in white-spirit according to GOST 3134) and 100 parts by weight of ethyl acetate. The mixture was thoroughly stirred. On the surface of the mixture should form a continuous mirror film.
Examples 2-4 are prepared analogously to example 1.
In examples 5, 6 used urethane rubber SKU-8TB (TU 38.103.468) with a molecular mass of 28000-32000.
The amount of aluminum pass the s is calculated from the ratio of urethane rubber to the aluminum paste 1,0: 0,7 (examples 1, 4, 5); 1,0: 0,6 (example 2); 1,0: 0,8 (examples 3, 6).
Example 7 (prototype). The composition comprises, in parts by weight: urethane rubber 50, isocyanate - 4.5, platesamenities - 50, aluminum filler - 37.5 and solvent - 185.
Heat-reflecting the composition can be applied onto the surface of kanalizacnych materials consisting of high-strength aramid fiber RAS (TU 17 0001040-6-105), nylon art. 8482-05 (TU 8378-036-0032-1069), Dacron art. 56 408 (TU 8378-043-00321069) with double-sided coating of urethane rubber (TU 38.103.209). Method of applying a heat-reflecting coating - spreminjanje (examples 1, 2, 3, 5, 6) or powder (example 4). The curing heat-reflecting coating is at a temperature of 20±2°C for 3-4 hours.
Table 1 shows the formulations of the composition and prototype, in table 2 - properties of the proposed composition and prototype table 3 - efficacy of polymeric heat-reflective compositions on various kanalizacnych materials.
|The efficacy of a polymeric heat-reflective compositions on various kanalizacnych materials|
|Kanalizaciyi material on fabric||the placeholder|
|The adhesion points (ex./after exposure to SW. water for 10 days) standard 15140-78||The aramid||1/1|
|Duration of preservation of excessive pressure 200 KPa under the influence of external|
|heat flow: 17 kW/m2||RAS||20 sec|
|29 kW/m2||CBM + composition 1||at least 30 min||complete loss of integrity|
|17 kW/m2||Nylon||10 sec|
|17 kW/m2||Nylon + composition 1||no less than 15 min|
|17 kW/m2||Dacron||5 sec|
|17 kW/m2||Dacron + composition 1||10 min|
|17 kW/m2||Nylon coated (aluminium powder)||10 min|
|(15 min - brown spots)|
As follows from the results presented in tables 1, 2 and 3, the polymer composition for heat-reflecting coatings based on polyurethane rubber with a molecular mass of 16000-18000 and aluminum paste deposited on kanalizaciyi material with a weight gain of not more than 30 g/m2, provides significantly more duration (at least 30 min) save the excess pressure inflatable structures under the influence of external heat flux significantly greater intensity of radiation (up to 29 kW/m2)than known heat-reflective composition deposited on kanalizaciyi material with a gain of more than 100 g/m2
Polymer composition for heat-reflecting coating comprising a urethane rubber, a curing agent, an aluminum filler and a solvent, characterized in that as the curing agent contains a mixture of diphenylmethanediisocyanate and MDI as aluminum filler - aluminum paste, the solvent is ethyl acetate in the following ratio of components, parts by weight:
|the ethyl acetate||155-375|
SUBSTANCE: invention relates to "true reflector" type thermostatic coatings with high resistance to UV radiation, and can be used in spacecraft passive thermal control systems. The thermostatic coating composition contains binder based on 15% solution of acrylic resin AS in a mixture of xylene and butanol solvents in ratio of 85:15 and silicone lacquer, which is a 50% solution of polymethylsiloxane resin in toluene, an organic solvent and aluminium paste TRP. The organic solvent used is a mixture of xylene and butanol in weight ratio 85:15. Components of the thermostatic coating composition are in the following ratio, wt %: 15% solution of acrylic resin AS 42-47; 50% solution of polymethylsiloxane resin 29-33; aluminium paste TRP 20-26; mixture of xylene and butanol in weight ratio 85:15 - up to application viscosity.
EFFECT: high resistance to the effect of cosmic space factors, longer active life of spacecraft, obtaining the following values of thermal radiation characteristics on the surface of articles.
1 tbl, 1 ex
SUBSTANCE: The invention relates to reflexive surfaces, covered at least partially with a transparent coloured layer with several shades, furthermore, the transparent coloured layer consists of a composition layer which contains particles encased in the polymer, whereas the width of the layer may vary. Described are the powder composition of the layer and the method of its production.
EFFECT: production of cover surfaces with greater colour saturation in comparison with similar powder composition without numerous nanoparticles encased in the polymer.
21 cl, 5 tbl, 6 ex
SUBSTANCE: pigment for light-reflecting thermostabilising coatings contains barium titanate in which titanium cations are partially substituted with zirconium ions until a solid solution of formula BaTi(1-x)ZrxO3, where x≤0.5. is obtained.
EFFECT: pigment has high reflecting power in the 450-900 nm spectral range compared to a pigment with similar structure which is based on barium titanate with a tin modifying additive.
6 dwg, 3 ex
SUBSTANCE: coating contains silicate binder, filler and distilled water. The silicate binder is lithium or sodium glass. The filler is a salt of an alkaline-earth element BaSO4 and a barium or lithium aluminate additive. The coating composition has application life of 3-5 weeks. The coating can be easily applied and has solar radiation absorption capacity (As)kon not greater than 0.33 when used for 15 years.
EFFECT: coating has low degree of deterioration of optical properties, low gas release, good adhesion to a substrate in outer space conditions, and electroconductive properties.
3 tbl, 3 ex
SUBSTANCE: invention relates to space materials science and optical engineering, particularly to a solar reflector class temperature-controlled coating composition meant for use in spacecraft passive thermal control systems. Said composition contains modified liquid potassium glass with silica modulus of 3.3-3.8 at density 1.204-1.216 g/cm3 as binder in amount of 26.4-28.7 wt %, pigment - zinc-gallium oxide with calculation formula ZnGaO1+n, where n=0.0064 in amount of 42.3-45.2 wt % and a solvent - distilled water in amount of 28.4-29.0 wt %. The "ЖКС"modifier used is an organic water-base copolymer based on latex.
EFFECT: composition enables to obtain solar reflector class temperature-controlled coating with high resistance to space radiation, low coefficient of absorption of solar radiation while retaining high radiation capacity, stabilising operation of communication electronics equipment and onboard systems of spacecraft, which prolongs the period for active existence of spacecraft on high orbits and reduces its weight characteristics.
SUBSTANCE: invention relates to light-reflecting coatings and can be used in space engineering, in various industries, as well as for supplying heat to residential and industrial buildings. The pigment for light-reflecting coatings contains barium titanate in which the titanium cation is partially substituted with a tin ion. Depending on temperature, radiation capacity of such a pigment lies between 0.42 and 0.77 while varying working temperature from -67 to +98°C.
EFFECT: invention enables thermal stabilisation of spacecraft and other equipment.
1 cl, 5 dwg, 3 ex
SUBSTANCE: proposed coating includes a lower layer of an aluminum alloy anodic oxide coating and an upper layer representing a thermo regulating paint coat comprising acrylate holmium-containing vanish "АКГ-1,2" (42-38 percent by weight) and oxide-modified zirconium (IV), 7-4 (58-62 percent by weight). The coating features low solar radiation absorption factor values (As ≤ 0,10-0,11) and high radiation factors (ε≥0,92-0,94). This allows reducing the radiator-emitter area which is particularly important in development of promising spacecrafts. Availability of two thermoregulating coatings, i.e. the anodic oxide and paint coatings allows a notable increase in service life of the said radiators and producing the said coatings on the surface of products made from aluminum or its alloys with lower As/ε parameter values and without drawbacks inherent in silicate coatings.
EFFECT: antirust protection of complicated-design structures and provision of preset thermal-and-radiation characteristics.
FIELD: inorganic chemistry.
SUBSTANCE: invention refers to production of materials used for protective coatings of various natural and man-made surfaces. Method is realised in the following way: neonol, marble powder are fine grinded in ball grinder. White spirit, aqueous ammonia (25%) and water are added and mixed to homogeneous composition which is added with carbon nanofibre, carbon nanoclusters and butadiene-styrene latex, all specified components are additionally mixed to homogeneous composition, added with defoaming agent and thickener. Produced material is packed. As carbon nanofibre and carbon nanoclusters components produced by methane pyrolysis on catalyst Ni/MgO at fibre length 50-100 mcm and diameter 20-60 nm. Finished product has high adhesive ability and protective properties as applied on metal, polymer surfaces, wood and other materials.
EFFECT: production of high-adhesive coating material with high protective properties.
FIELD: pigment preparation.
SUBSTANCE: invention can be applied in production of multilayer pigments for laser marking of papers and plastics, said pigments being based on glass scales used in paints, lacquers, plastics, foil, ceramic materials, and cosmetic compositions. In these pigments, glass scales are coated with at least three alternate layers having high and low refraction index values. Pigments include at least one sequence of layers, which comprises: (A) coating with refraction index n≥1.8, (B) coating with refraction index n≤1.8, and (C) coating with refraction index n≥1.8. and, if necessary, (D) outer protective layer, provided that layer packet (A)+(B) can be present in standard layer-by layer assembly (A)+(B)+(C) up to four times.
EFFECT: intensified interferential color of multilayer pigments.
11 cl, 9 ex
FIELD: application of coat on surfaces of articles made from polymer scintillation materials.
SUBSTANCE: proposed method includes mechanical treatment of surface of article, degreasing of this surface, treatment of this surface and drying in air. Surface of article is subjected to treatment with mixture of solvent of aromatic and chlorinated hydrocarbon and precipitating agent of lower monatomic alcohol and aliphatic hydrocarbon at ratio of 1: (1-2.5) continued for 25-35 s, after which article is washed in precipitating agent for 60-120 s for effective light reflection and maximum light collection; as a result, light efficiency is increased by 1.1-1.2 times.
EFFECT: enhanced technology of method; reduction of time required for forming the coats.
1 tbl, 6 ex
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
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
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
SUBSTANCE: polyurethane coating is made from a composition which contains refined castor oil, an ester, an antifoaming additive BYK-066 based on fluorine-modified polysiloxanes, aluminium oxide, titanium oxide, aerosil, a water adsorbent, an additive BYK-410 - urea in an organic solvent N-methylpyrrolidone, a curing agent isocyanate SUPRASEK 5025, which is 4,4'-diphenylmethane diisocyanate and additionally as filler - dolomite or zeolite or a mixture of dolomite and zeolite in ratio 3.25:1.
EFFECT: coating has high breaking strength and modulus of elasticity in tension, while providing sufficiently high deformation characteristics, particularly tensile elongation.
SUBSTANCE: method to manufacture a coating includes preparation of a mixture by means of mixing of a filler from rubber crumb and a binder based on polyurethane. Simultaneously and separately from each other mixtures are produced for basic and upper layers, at the same time in the mixture for the basic layer they use a filler from rubber crumb with fraction of 2-12 mm, and in the mixture for the upper layer they use a filler from rubber crumb with fraction of 1-3 mm and a pigment dye. In process of mixture mixing for its upper layer it is compacted, afterwards the mixture for the upper layer is serially discharged into a die mould, then the mixture for the basic layer is discharged, and pressed under pressure with the help of a press, then maintained until full hardening, and the produced coating is discharged from the die mould.
EFFECT: high efficiency of coating manufacturing, higher reliability and durability of a coating, possibility to manufacture a double-layer coating with damping properties.
SUBSTANCE: formulation composition contains: A) 5-95 wt % at least one radiation-curable resin, B) 5-25 wt % silicic acid, C) 0.1-10 wt % at least one adhesion promoter, D) 5-90 wt % at least one radiation-curable reactive diluent, E) 0.5-5 wt % at least one dispersant. The adhesion promoter is selected form phosphoric acid and/or phosphonic acid and/or products of reaction thereof with functionalised acrylates. The composition can additionally contain photoinitiators, pigments and additives, selected from diffusion promoting agents, delustering agents and degassing agents. The compositions are used as a primer, an intermediate layer, coating varnish and/or clear varnish, as well as for making coatings via a coil coating technique.
EFFECT: coatings have flexibility, thereby providing excellent protection of metal substrates from corrosion.
18 cl, 2 tbl, 6 ex
SUBSTANCE: invention relates to a self-crosslinking binder for coating compositions containing an aqueously dispersed polymer component A having at least one carbonyl group of the ketone or aldehyde type per molecule, and a component B having at least two hydrazine or hydrazide groups per molecule, and at least one structural unit -NR1-NR2-CHR3-CHR4-NH-R5 (I), where the radicals R1, R2, R3 and R4 are each individually selected from a group consisting of a hydrogen radical and a linear or branched alkyl radical having from 1 to 10 carbon atoms, R3 and R4 may additionally be selected from a group consisting of aryl and alkylaryl radicals having from 6 to 15 carbon atoms, and from oxyalkyl radicals with 1 to 10 carbon atoms, where oxy groups may be inserted into the alkyl chain or at the end of an alkyl chain, and R5 is selected from a group consisting of a hydrogen radical, alkyl radicals which may be linear, branched or cyclic and may have from 1 to 10 carbon atoms, and residues of formula -(CH2)n-CO-O-X, where n is an integer of from 1 to 6, and X is a residue of a polyatomic alcohol or phenol. A method of producing such a binder is also described.
EFFECT: producing a coating binder which is self-crosslinking when drying, having fast drying properties and improved chemical resistance and weather resistance.
17 cl, 5 ex, 5 tbl
SUBSTANCE: invention represents an emulsion, in which oligomers with terminal isocyanate groups are a dispersion medium, and a disperse phase is a solution or a dispersion produced as a result of mixing a lime solution with calcium hydroxide content of 10-70 wt % with glycerine in the amount of 1-250 wt parts per 100 wt parts of calcium hydroxide, besides, the disperse phase content in the composition makes 1-55 wt %.
EFFECT: development of a cheap and easy to apply composition, coatings from which have high adhesion to moist metal or concrete surfaces, have proper adhesion to concrete applied onto them, are hardened with specified speed at temperature from zero and above, inhibit processes of metal corrosion and have low elasticity module.
SUBSTANCE: coating has surface tension less than 20 mN/m, wherein the coating material used is hydrolysis-resistance lacquers, and where the hydrolysis-resistant lacquers are selected from a group consisting of polyurethanes, acryl and silicones, where the coating has a random topography with roughness of less than 500 nm, preferably less than 300 nm.
EFFECT: coating prevents deposit of bacteria and improves thermal conduction of the coated material.
19 cl, 4 dwg, 2 ex
SUBSTANCE: invention relates to aldimines of formula (I)
where A does not contain active hydrogen and a primary amine group, or together with R7 denotes a (n+2)-valent hydrocarbon radical containing 3-20 carbon atoms and, if necessary, at least one heteroatom in form of oxygen of an ether group or nitrogen or a tertiary amine group; n equals 1, 2, 3 or 4; m equals 0,1, 2, 3 or 4; R1 and R2 each denotes a univalent hydrocarbon residue with 1-12 carbon atoms or together denote a divalent hydrocarbon radical which is part of a carbocyclic ring with 5-8 carbon atoms; R3 denotes H or alkyl; R4 and R5 independently denote CH3 or a univalent aliphatic radical containing 2-12 carbon atoms and optionally hydroxy groups; X denotes O, S, N-R6, or N-R7, where R6 denotes a univalent hydrocarbon radical containing 1-20 carbon atoms and having at least one hydroxy group; as well as curable compositions containing such aldimines and use of said compositions.
EFFECT: obtaining novel aldimines which can be used as curing agents in curable compositions.
22 cl, 18 ex, 6 tbl
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