Thermoregulating coating of "sollar reflector" type
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.
The invention relates to the field of space science, namely, the temperature-controlled coating-class "solar reflectors".
At high values of the coefficient of absorption of solar radiation (As) to increase the area of the reflecting surfaces of the products, increase overall mass and reduced mass of the payload. Therefore, to optimize system passive thermal control of space vehicles require coatings with low values of Asand high values of emissivity ε.
In thermal systems provide the most preferred is the use of thermal control andlooking coatings on aluminum and its alloys because of their small thickness and, consequently, low weight. Being one-piece with aluminum base, they don't break away even from the effects of space debris, and provide protection from corrosion in terrestrial conditions and fully resistant to erosion from atomic oxygen in contrast to inorganic and organic coatings. However, the initial values of their thermo-radiating characteristics are quite large.
Closest to the proposed expansion of the coating to the technical essence is thermostatic coating (U.S. Patent No. 5296285 of March 22, 1994), a two-layer covered with the e, formed by creating a first layer by anodic oxidation of the aluminum substrate and applying a second upper layer consisting of silicate coating Z-93. The coating has the following characteristics: As≤0,15-0,20, ε≥from 0.90 to 0.92.
Such high initial values of the absorption coefficient Asrequire placement on space objects additional space radiators, cooling for heat relief. In addition, the silicate coating of the upper layer of the above composition has a number of technological limitations inherent to the whole class silicate coatings relative fragility, lack of elasticity, the complexity of the application.
The technical purpose of this invention is the development of thermal management coatings with low absorption capacity of solar radiation and high emissivity on aluminum and its alloys without flaws silicate coatings.
This task is solved in that the temperature-controlled coating-class "solar reflectors, including the lower layer andlooking coating on aluminum alloys and the top layer, wherein the upper layer is used to paint thermostatic coating containing acrylate holinesterzoy lacquer ACG-1.2 and zirconium (IV) oxide modified OSC-4 in the following ratio of components, wt.%:
|zirconium (IV) oxide modified||58-62|
The lower layer of the temperature-controlled coating-class "solar reflectors formed by applying a temperature-controlled andlooking coating (anodic oxide) on the samples of the alloy AMG after pre-treatment (degreasing, pickling, rinsing, polishing). Anodizing was performed in a solution of 18% sulfuric acid at a voltage of 12-15 volts, while the current density was maintained in the range of 0.8-1.2 a/DM2at a temperature of 18-20°C for 30 minutes followed by rinsing and filling the tub with hot deionized water at a temperature of 90-95°C for 15 minutes. The values of the coefficients amounted to As≤0,33, ε≥0,80. On the anodized surface of the samples was applied paint thermostatic based coating varnish ACG-1.2 and pigment zirconium (IV) oxide modified. For the preparation of compositions of the necessary quantity of zirconium (IV) oxide modified silicic acid water (mass fraction of modifier - 2%), high purity beyond 2611-269-00209792-2003 and varnish ACG-1,2 beyond 2313-001-07545731-2005, physico-mechanical parameters of which are given in table 1 were loaded into a porcelain drum soo is wearing porcelain balls:pigment = 1:1 (by weight) and mixed on a roller mill 60-90 minutes Then the resulting mixture was filtered through a nylon mesh. The coating was applied by spray gun. The drying was carried out at room temperature.
Values of thermo-radiating characteristics of the temperature-controlled coating based on anodic oxide paint composition was: As≥0,10-0,11, ε≥0,92-0,94.
|Name of indicator||The norm for varnish ACG-1,2|
|1. The appearance of the lacquer||Transparent homogeneous liquid without mechanical impurities|
|2. Color by iodine scale, mg I2/100 cm3not darker||3|
|3. Viscosity of the varnish on viscosimetry type VZ-246 with the nozzle diameter of 4 mm at a temperature of from 19.5 to 20.5°s||from 13 to 22|
|4. Mass fraction of non-volatiles, %||from 19 to 22|
|5. Acid number water extract, mg KOH, no more than||0,1|
|6. The content of the modifier in the dry residue in terms of triacetyluridine holmium, % (by wt.)||from 1.15 to 1.25|
|7. The drying time of the lacquer to the point 3 at a temperature of from 18 to 22°C, h, no more than||2|
|8. Appearance plank the lacquer||Smooth colorless homogeneous surface without winced and mechanical inclusions|
|9. The hardness of the film, conventional units, not less, by pendulum device:|
|type TML (pendulum a)||0,45|
|10. The elasticity of the film bending, mm, not more than||1|
|11. The resistance of the film to static action of water at a temperature of from 18 to 22°C, h, not less than||4|
|12. The resistance of the film to static action of nefras at a temperature of from 18 to 22°S, min, not less than||1|
Table 2 shows the values of thermo-radiating characteristics (TPX) thermal control coatings "class solar reflectors in various grades of aluminum alloy.
|Brand aluminum alloy||Modes anodizing||Initial values TPX after anodizing||Initial values TPX after coating||Note|
|Asnot more than||εnot less than||Asnot more than||; not less than|
|AMg6||the current density of 0.8 a/DM2temperature 17°, 15 minutes||0,22-0,27||0,75-0,79||0,10-0,11||0,92-0,93||Technology coating in all cases the same. Coating smooth, white, uniformly distributed on the sample surface.|
|AMG||the current density of 0.8-1.2 a/DM2temperature 18°C, 18 min||0,33-0,38||0,74-0,80||0,11-0,12||0,93-0,94|
|AD31||the current density 1-1,2 a/DM2temperature 18°time 20 minutes||0,21-0,23||0,79-0,80||0,10-0,11||0,94|
As can be seen from table 2, for the proposed expansion of the coverage of the class "solar reflectors" achieved high initial values of thermo-radiating characteristics of As≤0.10 to 0.11 and ε≥0,92-0,94 instead of As≤0,15-0,20, ε≥from 0.90 to 0.92.
The use of the claimed invention will:
- cut square hinged radiator cooling by reducing the initial value of the coefficient of solar absorption Asand increase the emissivity ε;
- to extend the period of operation of the radiator cooling due to the presence thermoregulate the corresponding anodic oxide after a possible failure of the top layer of the coating from exposure to atomic oxygen.
The temperature-controlled coating-class "solar reflectors", which includes the lower layer in the form of anodic oxide coatings aluminum alloy and an upper layer, wherein the upper layer used paint thermostatic coating containing acrylate holinesterzoy lacquer ACG-1.2 and zirconium (IV) oxide modified OSC 7-4 in the following ratio, wt.%:
|Zirconium (IV) oxide modified||58-62|
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
FIELD: spatial material science and optical engineering.
SUBSTANCE: invention is designed for use in system of passive thermoregulation of spatial apparatuses for manufacturing cold-drying coatings of class "sun reflectors", which are applied onto outer surfaces of spatial apparatuses. Composition according to invention comprises: 9.49-9.54 wt parts amide-containing acrylic resin as binder; 52.36-52.49 wt parts monocrystalline superfine white-colored powder of zinc-gallium oxide with calculated formula ZnGaO1+n, wherein n=0.0064, and molecular mass 81.38; and 37.99038.15 wt parts solvent: xylene/butanol mixture at ratio 4:1; provided that binder-to-filler ratio is 1:5.5 and fraction of nonvolatile substances is 58.0% maximum.
EFFECT: preserved high optical characteristics of coating during prolonged operation of spatial apparatus.
3 cl, 1 dwg, 3 tbl
SUBSTANCE: composition for coating of optical transparent information carriers is described, the composition being curable by UV radiation and including (A) from 1 to 60% by mass of at least one colloid oxide of metal, (B) from 0.1 to 50% by mass of at least one silyl acrylate hydrolysis product having a general formula (I): , (I) where a means an integer from 0 to 2, b means an integer from 1 to 3, and the sum a+b is from 1 to 3, R independently means non-branched or branched alkyl residue with 1 to 8 carbon atoms, cycloalkyl residue with 3 to 8 carbon atoms, unsubstituted or substituted aryl residue with 6 to 10 carbon atoms in the aryl portion, R1 independently means hydrogen, non-branched or branched alkyl residue with 1 to 8 carbon atoms, cycloalkyl residue with 3 to 8 carbon atoms, unsubstituted or substituted aryl residue with 6 to 10 carbon atoms in the aryl portion, R2 independently means hydrogen, non-branched or branched alkyl residue with 1 to 8 carbon atoms, unsubstituted or substituted aryl residue with 6 to 10 carbon atoms, R3 means single bond, or non-branched or branched, if necessary, substituted alkylene residue (alkane dienyl residue) with 1 to 8 carbon atoms in alkylene residue, or, if necessary, substituted arylene residue (aryl dienyl residue) with 6 to 10 carbon atoms in arylene residue, (C) from 25 to 90% by mass of at least one acrylate monomer of general formula (II) where n means a number from 1 to 6, R4 means hydrogen, non-branched or branched alkyl residue with 1 to 8 carbon atoms, unsubstituted or substituted aryl residue with 6 to 10 carbon atoms in the aryl portion and where substituents R4 may be the same or different; R5 means unsubstituted or substituted organic residue having a valency from 1 to 6 such as, if necessary, substituted, non-branched or branched aliphatic or aromatic hydrocarbon residue with 1 to 20 carbon atoms, and (D) from 0.01 to 15% by mass of at least one UV photoinitiator, respectively, with respect to the total mass of the composition, the composition being intended for coating transparent, polycarbonate-based, optical information carriers.
EFFECT: proposed composition is scratch-resistant and highly adhesive to the substrate surface.
3 cl, 2 tbl, 4 ex
FIELD: organic chemistry, chemical technology.
SUBSTANCE: invention relates to photoinitiating agents of phenylglyoxylic acid order used in polymerizing compositions to be subjected for hardening. Invention describes a photoinitiating agent of the formula (I): wherein Y means (C3-C12)-alkylene, butenylene, butinylene or (C4-C12)-alkylene that are broken by groups -O- or -NR2- and not following in sequence; R1 means a reactive group of the following order: -OH, -SH, -HR3R4, -(CO)-OH, -(CO)-NH2, -SO3H, -C(R5)=CR6R7, oxiranyl, -O-(CO)-NH-R8-NCO and -O-(CO)-R-(CO)-X; R2 means hydrogen atom, (C1-C4)-alkyl, (C2-C4)-hydroxyalkyl; R3 and R4 mean hydrogen atom, (C1-C4)-alkyl, (C2-C4)-hydroxyalkyl; R, R and R mean hydrogen atom or methyl; R8 means linear or branched (C4-C12)-alkylene or phenylene; R9 means linear or branched (C1-C16)-alkylene, -CH=CH-, -CH=CH-CH2-, C6-cycloalkylene, phenylene or naphthylene; X, X1 and X2 mean -OH, Cl, -OCH3 or -OC2H5. Also, invention describes a method for synthesis of a photoinitiating agent, polymerizing composition and substrate covered by its. Proposed photoinitiating agent possesses the effective introducing capacity and absence of migration in thermal treatments.
EFFECT: improved and valuable properties of agent.
13 cl, 1 tbl, 16 ex
FIELD: rocketry; production of the potting composition for armoring the charge made out of the ballistite propellant.
SUBSTANCE: the invention is pertaining to the field of rocketry and presents the potting composition for armoring the charge made out of the ballistite propellant. The potting composition includes polybutylmethacrylate, butylmethacrylate, methylmethacrylateand in the capacity of the initiator and activator of the hardening - benzoyl peroxide and dimethylaniline. At that polybutylmethacrylate is dissolved in the mixture of butylmethacrylate and methylmetacrylate. The invention ensures manufacture of the qualitative products with the required level of the physical-mechanical and adhesive properties, as well as to reduce smokiness of the gases, and to reduce temperature of the waste gases from 2200°С to 800°С.
EFFECT: the invention ensures manufacture of the qualitative products with the required level of the physical-mechanical and adhesive properties, as well as to reduce smokiness of the gases, and significantly to reduce temperature of the waste gases.
FIELD: polymer materials.
SUBSTANCE: invention relates to polymer composition based on binder, namely unsaturated polyether resin or oligoether acrylates, and may be used in medicine, in production of paint and lacquer materials, etc. Composition comprises, wt parts: unsaturated polyether resin or oligoether acrylates or mixtures thereof, 100; polymerization promoter, in particular complex compound prepared by reaction of vanadium derivatives (vanadium pentoxide, ammonium methavanadate, of methavanadic acid) with orthophosphoric acid/water/butanol mixture, 0.3-0.88; polymerization initiator: cumene hydroperoxide, 0.3-0.44; and modifying additives, 0-20.
EFFECT: optimized makeup involving inexpensive, easily available, and highly efficient promoter.
1 tbl, 6 ex
FIELD: organic chemistry, chemical technology.
SUBSTANCE: invention proposes a method for preparing vinylene carbonate mixture. Method involves interaction of monohaloethylene carbonate of the formula (II): wherein X means halogen atom with a dehydrohalogenating agent at temperature in the range 40-80°C but preferably at 60°C in organic solvent medium wherein ethylene carbonate is used as an organic solvent. As a dehydrohalogenating agent method involves using amine, in particular, trialkylamine but preferably triethylamine, and monochloroethylene carbonate is used as monohaloethylene carbonate preferably. Interaction is carried out in inert gas atmosphere preferably. Invention provides preparing vinylene carbonate mixture by a simple and economy method with the high content of vinylene carbonate in the end product. Method provides easily isolation of vinylene carbonate from the prepared mixture by distillation off, for example, under vacuum in the film evaporator. Also, invention relates to a crude vinylene carbonate mixture prepared by above described method that is designated as an additive for lithium-ionic batteries as a component of surface coating material as a monomer for preparing polyvinylene carbonate.
EFFECT: improved preparing method.
7 cl, 3 ex
FIELD: paint and varnish materials.
SUBSTANCE: invention describes a composition used in decorative finishing and comprising the following components, wt.-%: 20% solution of polymethylmethacrylate in dichloroethane as a film-forming agent, 20.5-23.25; aromatic solvent, 70.5-74.5, and aluminum powder modified with an organic dye by grinding, 4.25-5.0, taken in the ratio = 1:(0.005-0.008). The proposed composition provides decorative effect of cover mimic to mother-of-pearl with good adhesion of the composition on plastics of different chemical nature. Invention can be used in coloring plastics with imitation of mother-of-pearl, in particular, for national consumption goods.
EFFECT: improved and valuable properties of composition.
2 tbl, 2 ex