CN104774510A - Antistatic thermal control coating composition, preparation method and applications thereof - Google Patents
Antistatic thermal control coating composition, preparation method and applications thereof Download PDFInfo
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- CN104774510A CN104774510A CN201510125862.1A CN201510125862A CN104774510A CN 104774510 A CN104774510 A CN 104774510A CN 201510125862 A CN201510125862 A CN 201510125862A CN 104774510 A CN104774510 A CN 104774510A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D127/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers
- C09D127/02—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
- C09D127/12—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
- C08K9/04—Ingredients treated with organic substances
- C08K9/06—Ingredients treated with organic substances with silicon-containing compounds
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
- C09D183/04—Polysiloxanes
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/24—Electrically-conducting paints
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
- C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2296—Oxides; Hydroxides of metals of zinc
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Abstract
The invention discloses an antistatic thermal control coating composition, a preparation method and applications thereof. The coating composition comprises priming paint and finish paint. The priming paint is composed of a matrix namely organic fluorine resin and a filling material namely modified zinc oxide powder; wherein the zinc oxide is capable of forming vertical channels in the priming paint layer. The finish paint is composed of a matrix namely methyl silicone resin with multiple functional groups and a filling material namely modified zinc oxide powder; wherein part of the filling material penetrates the interface between the priming paint layer and the finish paint layer. The prepared antistatic thermal control coating has a white color, a thickness of 130 to 200 [mu]m, a solar absorption ratio of 0.20 to 0.25, a hemispherical emissivity of 0.85 to 0.91, a total mass loss (TML) not more than 1%, collectable volatile condensed mass (CVCM) not more than 0.1%, and a volume resistivity ([rho]v) not more than 107 [omega].m. The coating does not have the phenomenon of cracking, peeling, bubbling, and fading after 100 times of high-low temperature thermal cycle experiments in a temperature range of -100 to 100 DEG C, the optical properties of the coating is stable, and the adhesive force of the coating is high.
Description
Technical field
The present invention relates to heat control material technical field, be specifically related to a kind of antistatic thermal control coating composition and preparation method thereof, purposes.
Background technology
As the heat control system of one of the important leverage system of spacecraft entirety, just important as the body temperature Ore-controlling Role of people, be not only the prerequisite ensureing that new internal each several part instrument and structure can normally be run, and ensure that spacecraft can the prerequisite of steady running in space especially.The normal operation of each several part device of spacecraft inside is all defined in certain temperature range, so need temperature that is spacecraft is inner and surface environment to control in the scope required, reduces the amplitude size of temperature variation as far as possible.Therefore, need the thermal control for spacecraft to carry out more careful and deep research, the most basic, the most efficient manner realizing spacecraft thermal control is at present exactly use special heat management material.Nowadays, in the heat control material that spacecraft uses, the widest, that result of use the is best class heat control material of range of application is exactly thermal control coating, and on spacecraft, it plays the effect as human body skin, protects spacecraft.
Charging can be divided into surface-charged and bulk charging two kinds: surface-charged refers to that the injection due to a large amount of electric charge causes material surface current potential to be significantly higher than the phenomenon of surrounding enviroment current potential; Bulk charging refers to the phenomenon forming internal electric field because the xenogenesis charge injection degree of depth is different at material internal.
Because Electron Heat movement velocity is far above ion, so will there be a large amount of electronic deposition and electronegative on spacecraft surface.Under spacecraft different surfaces part can be in the different azimuth (as punching press-wake flow) of different envrionment conditionss (if any unglazed photograph) and direction of relative movement, in addition surfacing can different (difference such as photoemissivity, secondary emissionratio), make it can with different potentials, thus forming uneven charging, appearance potential is poor.Bulk charging (deep layer charging) is energy higher than the electron impact of tens kiloelectron-volts on spacecraft, its energy penetrable surface, its penetration depth increases with incident electron energy and increases, and the charging phenomenon that the co-energy ion of incident electron and surface is formed is assembled at some tens of pm place under the surface.When spacecraft surfacing insulate, they will be charged to different potentials in space plasma, thus may cause electric discharge, cause the fault of Spacecraft anomaly.The charge and discharge phenomena of spacecraft under space environment is a kind of group effect.According to plate condenser charge model, charging and discharging effects depends on material behavior in the present context.
Summary of the invention
Antistatic thermal control coating composition that the object of the present invention is to provide a kind of novel white and preparation method thereof, purposes; The white thermal control coating prepared due to common zinc oxide powder does not possess antistatic effect, and its surface resistivity can reach 10
12Ω m, is difficult to the demand meeting spacecraft surface anti-static.The present invention carries out modification for Zinc oxide powder, by carrying out surface modification treatment for the zinc oxide with space particular configuration, thus the blended ability of enhancing modified Zinc oxide powder and resin system, improve the conductivity of coating system simultaneously.The antistatic thermal control coating that coating composition of the present invention is made, can eliminate product Electrostatic Hidden Troubles in particular circumstances, ensures spacecraft reliability of operation, meets the demand of product to antistatic white hot control coating layer.
The object of the invention is to be achieved through the following technical solutions:
First aspect, the present invention relates to the antistatic thermal control coating composition of a kind of two-pack, described coating composition comprises primer base and topcoat paint; Described primer base comprises organic solvent a and mass ratio is the modification organic fluorine of 60 ~ 75: 25 ~ 40 and modified oxidized zinc powder; Described topcoat paint comprises organic solvent b and mass ratio is the polyfunctional group methyl silicon resin of 65 ~ 75: 25 ~ 35 and modified oxidized zinc powder.
Preferably, in order to the three-dimensional channel improving coating system internal oxidation zinc filler is set up, reduce resistivity, described modified oxidized zinc powder is modified obtained for having space particular configuration Zinc oxide powder; Described space particular configuration is selected from one or more in four needle-likes, bar-shaped, wire, tubulose.
Preferably, for improving blended ability and the optical property of coating own of modified zinc oxide and resin system, described modified oxidized zinc powder, first through the process of silane coupling agent surface impregnation, obtains through 400 DEG C ~ 700 DEG C high-temperature heat treatment after 50 DEG C of oven dry; Described modified zinc oxide pulverized structure size distribution ranges is 3 ~ 100 μm.
Preferably, the consumption of described organic solvent a is 0.1 ~ 0.2 times of modified oxidized zinc powder and modification organic fluorine gross weight; Described modified oxidized zinc powder accounts for 50 ~ 70wt% of primer base solid content.
Preferably, the consumption of described organic solvent b is 0.5 ~ 0.7 times of modified oxidized zinc powder and polyfunctional group methyl silicon resin gross weight; Described modified oxidized zinc powder accounts for 65 ~ 75wt% of topcoat paint solid content.
Preferably, for tackling different environment for use and base material, described organic solvent a, b are selected from one or more in acetone, butylacetate, dimethylbenzene respectively; Described organic solvent a, b may be the same or different.
Preferably, for adapting to different solidifying requirements and coating self performance demand, described polyfunctional group methyl silicon resin can be the one in methyl phenyl silicone resin, polyurethane-modified methyl silicon resin, cyanate ester modified methyl silicone resin, epoxide modified methyl silicon resin.
Second aspect, the invention still further relates to the preparation method of the antistatic thermal control coating composition of a kind of two-pack of the present invention, described method comprises the steps:
A, primer base are prepared: in modification organic fluorine, add modified oxidized zinc powder, mix and blend, add organic solvent a, mixing, and ultrasonic agitation is even;
B, topcoat paint are prepared: in polyfunctional group methyl silicon resin, add modified oxidized zinc powder, mix and blend, add organic solvent b, and mixing, ultrasonic agitation is even.
The third aspect, the invention still further relates to the purposes of a kind of two-pack of the present invention antistatic thermal control coating composition in the antistatic thermal control coating of preparation, described coating upwards comprises prime coat and top coat layer from base material; Described prime coat is with modification organic fluorine for matrix, and modified oxidized zinc powder is filler, and the modified zinc oxide in prime coat can form vertical passage in prime coat; Described top coat layer is with polyfunctional group methyl silicon resin for matrix, and modified oxidized zinc powder is filler, and partially modified zinc oxide runs through the interface of prime coat and top coat layer.
Preferably, the thickness of described prime coat is 50 μm ~ 100 μm, and the thickness of described top coat layer is 50 μm ~ 100 μm.
Preferably, prepare antistatic thermal control coating and specifically comprise: spray described primer base at matrix surface, at 22 ~ 55 DEG C, solidify 5 ~ 10h, spray described topcoat paint, at 30 ~ 65 DEG C, solidify 24 ~ 48h, obtain described antistatic thermal control coating.
Novel antistatic white hot control coating layer provided by the invention, has following characteristic:
A) outward appearance: white, coatingsurface evenly, bubble-free, flawless, to come off without peeling, nothing;
B) thickness: 130 μm ~ 200 μm;
C) hemispherical emissivity: 0.85 ~ 0.91;
D) solar absorptance: 0.20 ~ 0.25;
E) conductivity: ρ
v≤ 10
7Ω m.
F) vacuum deflation performance: all meet TML < 1%, CVCM < 0.1%;
G) thermal cycling test: coating meets after-100 ~+100 DEG C of 100 high/low temperature thermal cycling tests, without ftracture, peel off, bubble and metachromatism, stable optical performance, sticking power good;
Compared with prior art, the present invention has following beneficial effect: novel antistatic white hot control coating layer of the present invention is ensureing that coating has on the basis of good thermal control performance (solar absorptance, hemispherical emissivity), there is good conductive coating performance, coating construction is simultaneously simple, easy to learn, there is stronger exploitativeness, and it is good to stand-100 ~+100 DEG C of 100 temperature shock test postadhesion power, has lower vacuum deflation amount.
Accompanying drawing explanation
By reading the detailed description done non-limiting example with reference to the following drawings, other features, objects and advantages of the present invention will become more obvious:
Fig. 1 is the structural representation of novel antistatic white hot control coating layer;
Fig. 2 is for having the electrical conduction mechanism schematic diagram of space particular configuration (four needle-like) zinc oxide fillers;
Fig. 3 is for having scanning electron microscopy (SEM) figure of space particular configuration (four needle-like) zinc oxide fillers;
Embodiment
Below in conjunction with specific embodiment, the present invention is described in detail.Following examples will contribute to those skilled in the art and understand the present invention further, but not limit the present invention in any form.It should be pointed out that to those skilled in the art, without departing from the inventive concept of the premise, some distortion and improvement can also be made.These all belong to protection scope of the present invention.
embodiment 1
The present embodiment relates to a kind of antistatic thermal control coating composition and preparation method thereof, and antistatic thermal control coating composition is preparing the application in novel antistatic white hot control coating layer.
As shown in Figure 1, described coating from base material 3 upwards, is made up of two-layer heterogeneity coating the novel antistatic white hot control coating layer of the present embodiment respectively; Be positioned at priming paint and be called prime coat 2, by modification organic fluorine with there is space particular configuration zinc oxide form; The coating being coated on surface becomes top coat layer 1, is made up of polyfunctional group methyl silicon resin and modified zinc oxide.
The novel antistatic white hot control coating layer of the present embodiment adopts the antistatic thermal control coating composition of two-pack, and this coating composition comprises primer base and topcoat paint; Described primer base comprises organic solvent a (dimethylbenzene), modification organic fluorine and modified oxidized zinc powder; Described topcoat paint comprises organic solvent b (dimethylbenzene), polyfunctional group methyl silicon resin and modified oxidized zinc powder.
The modified oxidized zinc powder of this example is that the Zinc oxide powder with sterie configuration was entered modification, space particular configuration Zinc oxide powder is carried out surface modification treatment, first through surface modification immersion stain, after 50 DEG C of oven dry, through the high-temperature heat treatment of 400 DEG C ~ 700 DEG C; Described surface modification solution is the mixing solutions of silane coupling agent and deionized water, and mass ratio is 1: 9.Fig. 3 is for having scanning electron microscopy (SEM) figure of space particular configuration (four needle-like) zinc oxide fillers, space between the Zinc oxide powder as shown in Figure 3 with space particular configuration is larger, be difficult to resin system blended, therefore need surface modification treatment is carried out for space special construction zinc oxide.
The concrete preparation method of novel antistatic white hot control coating layer of the present embodiment comprises the steps:
1) primer base preparation: containing in P Modification organic fluorine, add modified oxidized zinc powder, mix and blend, add dimethylbenzene, mixing, ultrasonic agitation is even; By mass percentage: modified oxidized zinc powder accounts for the 70wt% of coating solids in primers, modification organic fluorine accounts for the 30wt% of coating total amount, the mass ratio of modified fluorin resin and modified oxidized zinc powder is 30: 70, and dimethylbenzene thinner is that modified oxidized zinc powder filler and modification organic fluorine gross weight 0.2 times adds by its consumption.
2) topcoat paint preparation: in methyl phenyl silicone resin, add modified oxidized zinc powder, mix and blend, add dimethylbenzene, mixing, ultrasonic agitation is even; By mass percentage: in finish paint, modified oxidized zinc powder (through silane coupling agent surface treatment) filler accounts for the 70wt% of coating solids, methyl phenyl silicone resin accounts for the 30wt% of coating total amount, the mass ratio of methyl phenyl silicone resin and Zinc oxide powder is 30: 70, and dimethylbenzene thinner is that modified oxidized zinc powder and polyfunctional group methyl silicon resin gross weight 0.6 times adds by its consumption.
3) preparing in coating procedure, first spraying spray-applied primer → solidify at 55 DEG C 5h → spray paint → solidify 24h at 30 DEG C.Wherein, the thickness of prime coat is 50 μm, and the thickness of described top coat layer is 50 μm.
As shown in Figure 2, sterie configuration zinc oxide fillers forms vertical passage in coating system.
embodiment 2
The present embodiment relates to a kind of antistatic thermal control coating composition and preparation method thereof, and antistatic thermal control coating composition is preparing the application in novel antistatic white hot control coating layer.
The present embodiment is substantially with embodiment 1, and institute's difference is:
1) primer base preparation: containing in P Modification organic fluorine, add modified oxidized zinc powder, mix and blend, add butylacetate, mixing, ultrasonic agitation is even; By mass percentage: modified oxidized zinc powder accounts for the 60wt% of coating solids in primers, modification organic fluorine accounts for the 40wt% of coating total amount, the mass ratio of modification organic fluorine and modified oxidized zinc powder is 60: 40, and butylacetate thinner is that modified oxidized zinc powder filler and modification organic fluorine gross weight 0.1 times adds by its consumption.
2) topcoat paint preparation: in methyl phenyl silicone resin, add modified oxidized zinc powder, mix and blend, add acetone, mixing, ultrasonic agitation is even; By mass percentage: in finish paint, modified zinc oxide powder filler accounts for the 75wt% of coating solids, polyfunctional group methyl silicon resin accounts for the 25wt% of coating total amount, the mass ratio of methyl phenyl silicone resin and modified oxidized zinc powder is 25: 75, and acetone diluted agent is that modified oxidized zinc powder and methyl phenyl silicone resin gross weight 0.7 times adds by its consumption.
3) preparing in coating procedure, first spraying spray-applied primer → solidify at 22 DEG C 10h → spray paint → solidify 48h at 30 DEG C.Wherein, the thickness of prime coat is 100 μm, and the thickness of described top coat layer is 100 μm.
embodiment 3
The present embodiment relates to a kind of antistatic thermal control coating composition and preparation method thereof, and antistatic thermal control coating composition is preparing the application in novel antistatic white hot control coating layer.
The present embodiment is substantially with embodiment 1, and institute's difference is:
1) primer base preparation: containing in P Modification organic fluorine, add modified oxidized zinc powder, mix and blend, add dimethylbenzene, mixing, ultrasonic agitation is even; By mass percentage: modified oxidized zinc powder accounts for the 50wt% of coating solids in primers, modification organic fluorine accounts for the 50wt% of coating total amount, the mass ratio of modification organic fluorine and modified oxidized zinc powder is 50: 50, and dimethylbenzene thinner is that modified oxidized zinc powder filler and modification organic fluorine gross weight 0.15 times adds by its consumption.
2) topcoat paint preparation: in methyl phenyl silicone resin, add modified oxidized zinc powder, mix and blend, add butylacetate, mixing, ultrasonic agitation is even; By mass percentage: in finish paint, modified zinc oxide powder filler accounts for the 65wt% of coating solids, methyl phenyl silicone resin accounts for the 35wt% of coating total amount, the mass ratio of methyl phenyl silicone resin and modified oxidized zinc powder is 35: 65, and butylacetate thinner is that modified oxidized zinc powder and methyl phenyl silicone resin gross weight 0.5 times adds by its consumption.
3) preparing in coating procedure, first spraying spray-applied primer → solidify at 35 DEG C 7h → spray paint → solidify 36h at 45 DEG C.Wherein, the thickness of prime coat is 80 μm, and the thickness of described top coat layer is 70 μm.
embodiment 4
Carry out performance test to the novel antistatic white hot control coating layer of above embodiment 1,2,3, testing method is as follows:
Coat-thickness is tested
The thickness of the MiniTest 600 thickness tester testing coating adopting German EPK company to produce.Useful range is 0 ~ 300 μm, error ± 2 μm; Minimum profile curvature radius 5mm (convex), 25mm (recessed); Minimum survey area φ 20mm; Instrument size 64 × 15 × 25mm; Probe size φ 14 × 62mm.The coat-thickness tested, between 130 ~ 180 μm, meets the requirement of technical indicator 130 ~ 200 μm.
Sticking power is tested
By the test requirements document of GJB 2704A-2006 spacecraft thermal control coating general specification.Be the adhesive tape of 2N/cm ~ 4N/cm by stripping strength, be close to coating region intermediate, isolated edge is not less than 3mm.With having pulled adhesive tape one end, and make adhesive tape and surface in 90 °, after slowly adhesive tape is pulled away from surface by (about 5mm/s), all line and to draw in lattice all without coming off, meet technical requirement.
Solar absorptance is tested
LAMBDA950 type ultraviolet-visible-near infrared spectrometer (UV/VIS/NIR Spectrophotometer) that this test adopts perkin elmer (Perkin-Elmer) company of the U.S. to produce measures the solar absorptance of antistatic white hot control coating layer.Its measurable wavelength region is 200nm to 2500nm, the resolving power of instrument is 0.1nm, bandwidth≤0.05nm, stray light≤0.00008%T, noise < 0.0008A, photometer repeatability < 0.0001A, baseline wander < 0.0002A/h, baseline straightening: ± 0.001A, high, the spuious auroral poles of good stability, baseline straightening degree is low.In experiment, step-length is set to 5nm, and slit width is set to 4nm.
Table 1 coating solar absorptance and emittance
| Sample number into spectrum | Embodiment 1 | Embodiment 2 | Embodiment 3 |
| Solar absorptance | 0.197 | 0.211 | 0.225 |
| Hemispherical emissivity | 0.868 | 0.864 | 0.90 |
Hemispherical emissivity is tested
The hemispherical emissivity of the TEMP 2000A emissivity measurement instrument measure sample adopting the development of U.S. AZ TECHNOLOGY company at room temperature 3 ~ 35 mu m wavebands, its measuring accuracy is ± 3%, and all wave band repeatability is ± 0.5%.
Volume specific resistance is tested
Adopt volumetric surface resistance determinator (model GEST-121, Instrument Ltd. is tested in Beijing hat test), by the testing method requirement of GB/T1410-2006 solid insulating material volume specific resistance and surface resistivity test method and QJ2220.2-92 coating electrical insulation capability testing method insulation resistance, surface resistivity, volume specific resistance, coating is being carried out to volume resistance and surface resistivity test, and according to the volume specific resistance of formulae discovery sample and surface resistivity.
Thermal cycling is tested
Adopt temperature shock case (model ZTS010, Shanghai Zeng Da environmental test equipment company limited), by the requirement of Q/RJ133.1-2002S781 white paint thermal control coating specification thermal cycling test, in normal atmospheric conditions it, through 100 thermal cyclings of temperature-100 DEG C ~+100 DEG C, test conditions is as follows:
1) test temperature: high-end temperature is 100 DEG C, and low side temperature is decided to be-100 DEG C;
2) cycle index: 100 times;
3) temperature control error: high temperature ± 5 DEG C, low temperature ± 10 DEG C;
4) thermocirculator should have the constant temperature zone of two differing tempss, is transferred to another flat-temperature zone in sample 10s from a flat-temperature zone;
5) at high temperature, low-temperature end insulation 5min, guarantee that test piece temperature is identical with envrionment temperature;
6) dehumidifying measure should be taked during test, prevent strip frosting;
Test-results: modified coating is through-100 ~+100 DEG C of 100 high/low temperature thermal cycling well-tended appearances, and stable optical performance, sticking power well meets technical requirement.
Vacuum deflation performance test
Reference standard QJ1558 carries out vacuum deflation test, and test conditions is as follows:
1) sample heating temperature 125 DEG C ± 1 DEG C or 150 DEG C ± 1 DEG C;
2) collected volatile condensable materials temperature: 25 DEG C;
3) test pressure: be better than 7 × 10
-3pa;
4) soaking time: 24h;
5) sample process in early stage: 23 DEG C ± 1 DEG C, humidity 45%RH ± 10%RH, keeps 24h;
6) balance measurement sensitivity: 1 μ g.
Material total mass loss (TML) in measuring and calculation vacuum, volatile matter (CVCM) can be coagulated; As shown in table 2.
Table 2
| Sample number into spectrum | Embodiment 1 | Embodiment 2 | Embodiment 3 |
| Total matter damages TML | 0.3603％ | 0.3807％ | 0.2505％ |
| Volatilization CVCM can be coagulated | 0.0311％ | 0.0433％ | 0.0270％ |
Associative list 1,2 and experimental test result, the performance of novel antistatic white hot control coating layer of the present invention is as follows:
A) outward appearance: white, coatingsurface evenly, bubble-free, flawless, to come off without peeling, nothing;
B) thickness: 130 μm ~ 200 μm;
C) solar absorptance: 0.20 ~ 0.25;
D) hemispherical emissivity: 0.85 ~ 0.91;
E) thermal cycling test: coating meets after-100 ~+100 DEG C of 100 high/low temperature thermal cycling tests, without ftracture, peel off, bubble and metachromatism, stable optical performance, sticking power good;
F) vacuum deflation performance: all meet TML < 1%, CVCM < 0.1%;
G) conductivity: ρ
v≤ 10
7Ω m.
In sum, novel antistatic white hot control coating layer of the present invention is ensureing that coating has on the basis of good thermal control performance (solar absorptance, hemispherical emissivity), there is good conductive coating performance, and coating can self-vulcanizing, avoid the impact on spacecraft product in coating baking-curing process, coating construction is simultaneously simple, easy to learn, have stronger exploitativeness, and it is good to stand-100 ~+100 DEG C of 100 temperature shock test postadhesion power.Above specific embodiments of the invention are described.It is to be appreciated that the present invention is not limited to above-mentioned particular implementation, those skilled in the art can make various distortion or amendment within the scope of the claims, and this does not affect flesh and blood of the present invention.
Claims (10)
1. the antistatic thermal control coating composition of two-pack, it is characterized in that, described coating composition comprises primer base and topcoat paint; Described primer base comprises organic solvent a and mass ratio is the modification organic fluorine of 60 ~ 75: 25 ~ 40 and modified oxidized zinc powder; Described topcoat paint comprises organic solvent b and mass ratio is the polyfunctional group methyl silicon resin of 65 ~ 75: 25 ~ 35 and modified oxidized zinc powder.
2. the antistatic thermal control coating composition of two-pack as claimed in claim 1, is characterized in that, described modified oxidized zinc powder is modified obtained for having space particular configuration Zinc oxide powder; Described space particular configuration is selected from one or more in four needle-likes, bar-shaped, wire, tubulose.
3. the antistatic thermal control coating composition of two-pack as claimed in claim 2, is characterized in that, described modified oxidized zinc powder, first through the process of silane coupling agent surface impregnation, obtains through 400 DEG C ~ 700 DEG C high-temperature heat treatment after 50 DEG C of oven dry.
4. the antistatic thermal control coating composition of two-pack as claimed in claim 1, it is characterized in that, the consumption of described organic solvent a is 0.1 ~ 0.2 times of modified oxidized zinc powder and modification organic fluorine gross weight; Described modified oxidized zinc powder accounts for 50 ~ 70wt% of primer base solid content; The consumption of described organic solvent b is 0.5 ~ 0.7 times of modified oxidized zinc powder and polyfunctional group methyl silicon resin gross weight; Described modified oxidized zinc powder accounts for 65 ~ 75wt% of topcoat paint solid content.
5. the antistatic thermal control coating composition of two-pack as claimed in claim 1, it is characterized in that, described organic solvent a, b are selected from one or more in acetone, butylacetate, dimethylbenzene respectively; Described organic solvent a, b may be the same or different.
6. the antistatic thermal control coating composition of two-pack as claimed in claim 1, it is characterized in that, described polyfunctional group methyl silicon resin is selected from the one in methyl phenyl silicone resin, polyurethane-modified methyl silicon resin, cyanate ester modified methyl silicone resin, epoxide modified methyl silicon resin.
7. a preparation method for the antistatic thermal control coating composition of the two-pack according to any one of claim 1 ~ 6, it is characterized in that, described method comprises the steps:
A, primer base are prepared: in modification organic fluorine, add modified oxidized zinc powder, mix and blend, add organic solvent a, mixing, and ultrasonic agitation is even;
B, topcoat paint are prepared: in polyfunctional group methyl silicon resin, add modified oxidized zinc powder, mix and blend, add organic solvent b, and mixing, ultrasonic agitation is even.
8. the purposes of the antistatic thermal control of the two-pack according to any one of claim 1 ~ 6 coating composition in the antistatic thermal control coating of preparation, it is characterized in that, described coating upwards comprises prime coat and top coat layer from base material; Described prime coat is with modification organic fluorine for matrix, and modified oxidized zinc powder is filler; Described top coat layer is with polyfunctional group methyl silicon resin for matrix, and modified oxidized zinc powder is filler.
9. purposes as claimed in claim 8, it is characterized in that, the thickness of described prime coat is 50 μm ~ 100 μm, and the thickness of described top coat layer is 50 μm ~ 100 μm.
10. purposes as claimed in claim 8, is characterized in that, prepare antistatic thermal control coating and specifically comprise: spray described primer base at matrix surface, 5 ~ 10h is solidified at 22 ~ 55 DEG C, spray described topcoat paint, at 30 ~ 65 DEG C, solidify 24 ~ 48h, obtain described antistatic thermal control coating.
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