CN115678368B - 2-14-micrometer-band high-absorption stray light-eliminating coating paint and preparation and application thereof - Google Patents
2-14-micrometer-band high-absorption stray light-eliminating coating paint and preparation and application thereof Download PDFInfo
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Abstract
The invention belongs to the technical field of surface engineering, and particularly relates to a 2-14 micron band high-absorption stray light eliminating coating paint, and preparation and application thereof. The middle bottom layer paint of the coating paint comprises the following components: aqueous methacrylic resin, modified carbon aerogel; the intermediate layer paint comprises: aqueous methacrylic resin, modified carbon aerogel and modified diatomite; the topcoat paint comprises: aqueous methacrylic resin, modified carbon aerogel and modified diatomite. On the basis of original high-absorption carbon aerogel filler, the coating combines the specific pore size of the diatomite with the large particle size under the cooperation of creating a rough interface structure based on the high-thickness middle layer of the diatomite filler with the large particle size, so that a extinction trap capable of reflecting repeatedly is formed under the microcosmic condition of the coating, incident light is reflected and absorbed repeatedly between particles butted by the diatomite and the pore size of the diatomite, the reflectivity is further reduced, the light absorption performance of the coating is optimized, and the infrared low reflection and high absorptivity are realized.
Description
Technical Field
The invention belongs to the technical field of surface engineering, and particularly relates to a 2-14 micron band high-absorption stray light eliminating coating paint, and preparation and application thereof.
Background
With the continuous development of the aerospace technology, the detection level of China in the field of space optical remote sensing is also continuously improved, and the understanding of the detection application of different optical wave bands is more accurate and clear. The infrared detection can realize passive detection due to the fact that any object with the temperature higher than absolute zero (0K) radiates infrared energy, namely the detected object is good in concealment, small in size and light in weight, infrared radiation of the detected object cannot be prevented, and the infrared remote sensing technology is enabled to have the characteristics of being capable of working in all weather and penetrating through cloud imaging due to the broadband characteristic of infrared light, and the infrared remote sensing technology is particularly suitable for being widely used in the field of space science and the field of space military attack and defense.
However, in applications such as earth observation, meteorological observation, or military early warning investigation of optical imaging detection instruments such as a spatial infrared remote sensing camera and a telescope, if the optical system of the detection instrument in the imaging device or the thermal radiation of the components of the instrument itself in the field of view is strong, the background noise can seriously affect the detection of the target by the detection instrument. Therefore, in order to improve the detection sensitivity of the infrared detection system, the radiation intensity of the components in the optical system of the detection instrument during the working process and the infrared radiation interference caused by the non-imaging target in the outer space of the optical system must be reduced at the same time. The existing space infrared remote sensing camera and telescope can inhibit infrared stray light of objects such as sunlight, earth reflected light, satellite reflected light of other structures and the like of non-imaging targets by utilizing stray light eliminating coating materials of an inner cavity of a lens outer hood; the optical system is internally coated with the high-absorption low-reflection stray light eliminating coating material at a local position to reduce the infrared noise interference caused by the working heating process of components by matching with a low-temperature refrigeration environment. Therefore, the infrared stray light coating material has very important guarantee function for imaging precision and imaging quality of space infrared remote sensing.
The existing space infrared detector response wave band covers near infrared, middle infrared and far infrared, wherein the detection wave band of the spacecraft infrared detector such as earth weather monitoring, ground ocean exploration, space attack and defense is mainly concentrated in the infrared wave band of 2-14 mu m, so that in order to better inhibit noise generated by non-detection imaging substances in the wave band, an infrared inhibition coating material is required to be arranged in the wave band, and infrared radiation of the non-detection imaging substances is reduced to enter the detector.
The following table is the detection application of the space science and the meteorological field corresponding to different infrared detection wave bands, and the working temperature of the infrared detection instrument is designed in a low-temperature environment within the range of 2-14 mu m wave bands, wherein the minimum working temperature can reach 100K, which indicates that the infrared detection needs to be severely inhibited for noise interference of non-imaging objects. However, due to the fact that the existing infrared band stray light eliminating coating is short in optional materials and insufficient in performance, the current space infrared remote sensing camera, telescope and other instruments need to work in an on-orbit ultra-long standby short time and then cooperate with low-temperature refrigeration to reduce the influence of infrared radiation stray light of internal components, the external infrared stray light is restrained from blocking the stray light from entering a lens through a large-caliber light shield, the above measures cause serious waste on the working efficiency, the size and the quality of a spacecraft, and the extra-high-absorptivity stray light eliminating coating materials with the wave band of 2-14 mu m are needed, so that high-performance material guarantee is provided for the work of the space infrared instrument.
TABLE 1 detection application of spatial infrared remote sensing in different infrared bands
Patent CN 111548723A discloses a high infrared absorption coating based on carbon black and polyurethane resin, but its infrared absorption is only 0.96 and its infrared suppressing ability is not strong. Although the light absorptivity of the stray light eliminating coating disclosed in the patent CN 113663894A reaches 0.98 in the infrared band, from the implementation case, the mode is that the binder is only used as a binding base material and powder, in order to ensure that the microstructure characteristic of a coating interface reaches 0.98, the powder surface is not wrapped by resin, the powder is extremely easy to fall off to become pollutants after the solvent volatilizes, and the binding force performance of the material cannot meet the application scene requirements of a high-low temperature alternating environment of the operation and standby of a spatial infrared instrument, so that the material is difficult to be practically applied in a precise infrared remote sensing optical system.
The present invention has been made to solve the above-described problems.
Disclosure of Invention
The high absorptivity coating components used at home and abroad at present mainly use carbon black, carbon nano tube, carbon aerogel and the like as black pigment to absorb light, use resin as binder, use white carbon black, talcum powder and other powder materials as matting agent to reduce specular reflection of a paint film.
Diatomite is prepared from SiO 2 The porous powder material as main component has powder particle size range covering nanometer to millimeter level, original soil pore diameter range covering 50-3000 nm and specific surface area range 40-65 m 2 The melting point is 1650-1750 ℃, the refractive index is 1.4-1.46, and the maximum advantage of the material as a matting material compared with white carbon black matting powder is that the particle size and the pore diameter have wide selectivity, and the pore size can be processed and regulated.
According to the invention, diatomite with the grain diameter of 100-150 mu m and pore diameter range of 3000-5000 nm (3-5 mu m) after hole expansion modification is used as a matting agent for an infrared high-absorptivity stray light eliminating coating for the first time, so that the absorption rate of the diatomite with the grain diameter of 2-14 mu m is up to 0.987, the capability of inhibiting infrared noise and space stray light of components in and out of an infrared optical instrument system of an aerospace vehicle is obviously improved, and the influence on the improvement of the working efficiency, the size and the quality design capability of an infrared remote sensing type spacecraft is obvious.
The coating is characterized in that 2-14 mu m-band high-efficiency infrared stray light performance diatomite powder and carbon aerogel with high absorption capacity are used as fillers to be added into a coating system, the coating system is designed to be an undercoat, an intermediate layer and a top coating, the undercoat is used for improving interface binding force with a base material, the intermediate layer with the largest thickness forms an obvious rough interface microstructure on the basis of guaranteeing the binding force, and the ultrathin surface layer with the lowest thickness is provided with a high proportion of light absorption fillers to realize the final infrared high absorption low reflection characteristic of the coating material.
The coating design is characterized in that infrared light with the wavelength of 2-3 mu m and below 2 mu m is absorbed by high-proportion light absorption filler and extinction filler of a coating surface layer, the infrared light with the wavelength of 3-14 mu m is long in wavelength and good in penetrability, the wavelength characteristic of the wavelength is utilized to enable the infrared light with the wavelength of 3-14 mu m to penetrate through an ultrathin surface layer, the infrared light is in multiple reflections in the matched holes, the infrared light is in multiple contact with the high-light absorption filler when the reflection is added, and finally the high-performance absorption effect is realized. The bottom layer is used for guaranteeing the binding force between the coating and the substrate, the ultrathin surface layer reduces extinction diatomite and increases the proportion of carbon aerogel serving as a light absorption filler, so that the rough microstructure of the coating is molded, the mechanical property of the interface between the coating and the outside is guaranteed, and the phenomenon of powder falling is prevented from polluting an optical instrument.
The first aspect of the invention provides a 2-14 μm band infrared high absorption stray light eliminating coating paint, comprising: a primer paint, a middle paint and a top paint;
the primer paint comprises: aqueous methacrylic resin, modified carbon aerogel, dispersing aid and water. The mass ratio of the primer is (0.9-1.1), (0.3-0.5), (0.1-0.2) and (4-6) in sequence according to the material sequence.
The intermediate layer paint comprises: aqueous methacrylic resin, modified carbon aerogel, modified diatomite, a dispersing aid and water. The mass ratio of the intermediate layer paint is (0.9-1.1), (0.3-0.5), (4-6), (0.5-1) and (8-10) in sequence according to the material sequence.
The topcoat paint comprises: aqueous methacrylic resin, modified carbon aerogel, modified diatomite, a dispersing aid and water. The mass ratio of the surface layer paint is (0.9-1.1), (0.6-1), (1-2), (0.5-1) and (8-10) in sequence according to the material sequence.
The modified carbon aerogel is carbon aerogel modified by sulfuric acid, and the specific surface area of the carbon aerogel is 1500-4000m 2 Per gram, the density is 0.1-0.5 g/cm 3 And is commercially available.
The modified diatomite is obtained by diatomite raw soil purification, calcination reaming and silane coupling agent grafting, the grain diameter of the modified diatomite after reaming and before grafting (namely after diatomite raw soil purification and calcination reaming) is 100-150 mu m, and the micropore diameter is 3-5 mu m. The diatomaceous earth raw earth is commercial primary earth (100 mesh).
The aqueous methacrylic resin, the modified carbon aerogel, and the dispersing aid in the primer, the intermediate layer, and the topcoat paint may be the same or different from each other.
The aqueous methacrylic resin is selected from the group consisting of primer, intermediate layer and top layer paints: one or more of water-soluble methacrylic resin, emulsion methacrylic resin and water-dispersible methacrylic resin.
In the bottom paint, the middle paint and the surface paint, the dispersing auxiliary agent adopts one or more of road-rinse Solsperse20000, solsperse24000 and Solsperse 47000.
In a second aspect, the present invention provides a method for preparing a coating paint according to the first aspect, the method for preparing a primer paint comprising the steps of:
(1) Sequentially adding aqueous methacrylic resin, modified carbon aerogel, a dispersing aid, water and glass beads into a container A1;
wherein the mass ratio of the aqueous methacrylic resin to the modified carbon aerogel to the modified diatomite to the dispersing aid to the water is (0.9-1.1), (0.3-0.5), (0.1-0.2) and (4-6) in sequence, the modified carbon aerogel is the carbon aerogel modified by sulfuric acid, and the specific surface area of the carbon aerogel is 1500-4000m 2 Per gram, the density is 0.1-0.5 g/cm 3 ；
(2) And (3) placing the container A in the step (1) in a sanding and stirring device, stirring to uniformly disperse the container A, and filtering the glass beads to obtain the bottom paint.
Preferably, the preparation method of the intermediate layer paint comprises the following steps:
(1) Adding aqueous methacrylic resin, a dispersing aid, water, modified carbon aerogel and glass beads into a container A2;
(2) Placing the container A2 in the step (1) in a sanding and stirring device, stirring, and filtering glass beads to form black color paste in the container B2;
(3) Adding the modified diatomite into the black color paste of the container B2, and stirring to obtain an intermediate layer paint;
wherein, the aqueous methacrylic resin, the modified carbon aerogel, the modified diatomite, the dispersing auxiliary and the water; according to the sequential mass ratio of (0.9-1.1), (0.3-0.5), (4-6), (0.5-1), (8-10);
the modified carbon aerogel is carbon aerogel modified by sulfuric acid, and the specific surface area of the carbon aerogel is 1500-4000m 2 Per gram, the density is 0.1-0.5 g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the The modified diatomite is obtained by expanding holes and grafting a silane coupling agent, and the particle size of the modified diatomite after expanding holes and before grafting is 100-150 mu m, and the pore size is 3-5 mu m.
The particle size and the pore size of the modified diatomite after reaming and before grafting are the particle size and the pore size of the modified diatomite. The grafting has no effect on the particle size and pore size of the diatomaceous earth. The grafting modification aims to uniformly disperse diatomite in a water-based acrylic resin system and reduce sedimentation and agglomeration.
Preferably, the preparation method of the surface layer paint comprises the following steps:
(1) Adding aqueous methacrylic resin, a dispersing aid, water, sulfuric acid modified carbon aerogel and glass beads into a container A3;
(2) Placing the container A3 in the step (1) in a sanding and stirring device, stirring, and filtering glass beads to form black color paste in the container B3.
(3) Adding the modified diatomite into the black color paste of the container B3, and stirring to obtain an intermediate layer paint;
wherein the mass ratio of the water-based methacrylic resin to the modified carbon aerogel to the modified diatomite to the dispersing aid is (0.9-1.1): (0.6-1): (1-2): (0.5-1): (8-10);
the modified carbon aerogel is carbon aerogel modified by sulfuric acid, and the specific surface area of the carbon aerogel is 1500-4000m 2 Per gram, the density is 0.1-0.5 g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the The modified diatomite is obtained by expanding the pores of diatomite and grafting a silane coupling agent, and the particle size of the modified diatomite after expanding the pores and before grafting is 100-150 mu m3-5 μm.
Preferably, the preparation method of the primer paint, the intermediate paint and the top paint comprises the following steps:
in the step (1), the size of the glass beads is 0.8-1 mm; the mass ratio of the sulfuric acid modified aerogel to the glass beads is 1 (30-40);
in the step (2), the rotating speed of the sanding and stirring device is 2500-3000 r/min, and the stirring time is 1-2 h;
in the step (3), the stirring speed is 1500-2000 r/min, and the stirring time is 1-2 h.
Preferably, the preparation method of the sulfuric acid modified carbon aerogel comprises the following steps:
(1) Adding carbon aerogel and concentrated sulfuric acid into a round-bottom flask, wherein each 1g of carbon aerogel corresponds to 80ml of concentrated sulfuric acid (70% -80%), refluxing at a constant temperature of 50-70 ℃ for 3-6 hours, and naturally cooling to room temperature to obtain black suspension;
(2) Carrying out suction filtration on the black suspension obtained in the step (1) on a Buchner funnel to obtain black powder, and repeatedly flushing the black powder with deionized water until the flushing liquid is colorless and transparent;
(3) And (3) drying the black powder subjected to suction filtration in the step (2) to obtain the sulfuric acid modified carbon aerogel powder.
Preferably, the preparation method of the modified diatomite comprises the following steps:
(1) Dispersing diatomite with water, soaking for 24 hr, ultrasonic sieving (100 mesh), and oven drying.
(2) And (3) calcining the purified diatomite in the step (1) at a high temperature, wherein the calcining temperature is raised to 700-800 ℃ from room temperature, the heating rate is controlled to be 5-10 ℃/min, and the diatomite is naturally cooled for standby after heat preservation for 2-3 h.
(3) Adding the diatomite calcined and reamed in the step (2) into water, and then adding a silane coupling agent for grafting modification to form a solution.
(4) The silane coupling agent added in the step (3) can be 1 or 2 of believed KBM-403, KBM-1003 and KBM-903, and the mass ratio of the added silane coupling agent to the diatomite is (0.1-0.4): 10.
(5) And (3) carrying out ultrasonic treatment on the solution obtained in the step (4) for 1-5 hours at the temperature of 20-40 ℃, filtering and drying to obtain the calcined hole-enlarging diatomite grafted by the silane coupling agent.
In the preparation method, the large-particle-size and reamed modified diatomite is provided for a rough interface structure of the coating and extinction traps at a microscopic scale. The carbon aerogel with high specific surface area can be better dispersed in an organic resin system through sulfuric acid modification, so that the coating has excellent light absorption performance.
The aqueous methacrylic resin is used as a binder, has high hardness and good binding force, and is suitable for guaranteeing the mechanical properties of the rough interface coating. The dispersing aid provides dispersing and curing promoting effects. Water was used as solvent.
The third aspect of the invention provides a 2-14 μm infrared band high absorption stray light eliminating coating, which is prepared by the following steps: spraying the primer paint, the intermediate paint and the surface paint of any one of the first aspect on a substrate test piece in sequence, and curing to obtain the stray light eliminating coating.
Preferably, the substrate coupon includes, but is not limited to, aluminum alloys, magnesium alloys, stainless steel, titanium alloys, carbon fiber composites, polyetheretherketone composites, and the like. Preferably, an aluminum alloy is used.
Preferably, the curing mode is that the paint is sprayed on the bottom paint, then is sprayed on the middle paint after being placed for 12 hours at room temperature, then is sprayed on the surface paint after being placed on the middle paint for 12 hours at room temperature, and can be baked and cured after being placed for 4 hours after the surface paint is sprayed on, preferably, the baking temperature is 80 ℃, the baking time is 12 hours, and the curing is completed.
The stray light eliminating coating comprises a primer layer, a middle layer and a finish paint layer in sequence from the bottom layer to the surface layer.
Preferably, the thickness of the stray light eliminating coating is preferably 380-480 mu m, the thickness of the primer layer is preferably 15-30 mu m, and the spraying times are 3-5 times; the preferable thickness range of the intermediate layer is 280-330 mu m, and the spraying times are 4-6 times; the thickness of the top coating layer is 85-120 micrometers, and the spraying times are 1-2 times.
In a fourth aspect the invention provides the use of a stray light removing coating according to the third aspect for absorbing stray light in the 2-14 μm band.
In a fifth aspect, the present invention provides a use of the stray light removing coating according to the third aspect for absorbing stray light in the wavelength range of 2 to 14 μm in a spatial infrared optical system.
In order to better ensure the imaging quality and precision of space infrared remote sensing instruments such as an infrared telescope, an infrared spectrometer, an infrared camera and the like, stray light generated by non-detection imaging substances in the working wave band and infrared noise generated by heating during the working of components in the instruments must be greatly restrained. Therefore, the infrared stray light coating material is coated on the inner wall area of the lens external light shield of the infrared remote sensing equipment and the peripheral area of the light path channel in the infrared instrument system, and the infrared stray light interference caused by the non-imaging light path is reduced to the greatest extent through the high absorption performance of the coating material.
As the incident stray light can enter the energy detection surface of the lens at least through more than 2 times of scattering in the design of the existing product, the stray light with the incident energy of 1 is absorbed for 2 times by the coating with the absorptivity of 0.97, and the scattered energy is 0.03 2 ＝9×10 -4 The method comprises the steps of carrying out a first treatment on the surface of the Absorbed by the 0.98 absorption rate coating for 2 times, the scattered energy is 0.02 2 ＝4×10 -4 The energy scattered by the coating with the absorptivity of 0.98 is 44% of the scattered energy of the coating with the absorptivity of 0.97, the scattered energy is obviously reduced, the detection quality and efficiency of the spatial infrared instrument can be greatly improved, the size of an external lens hood of a lens is reduced, and the overall weight reduction of a satellite is promoted under the requirement of suppressing the same stray light.
Therefore, the improvement of the absorptivity of the infrared stray light coating material is very important, and meanwhile, in order to be used in an infrared optical instrument system, the indexes of binding force, vacuum quality loss and vacuum condensable volatile matters of the infrared stray light coating are also required to be effectively ensured.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention develops a diatomite aperture structure-based 2-14 mu m band infrared high-absorption stray light eliminating coating paint. The coating paint uses carbon aerogel and diatomite as fillers, and can be cured to form an infrared high-absorption coating with a bottom layer, an intermediate layer and a surface layer structure. Aiming at the high absorption and stray light elimination requirement of an infrared spectrum wave band of 2-14 mu m, the coating is matched with a rough interface structure based on a high-thickness middle layer of a diatomite filler with large particle size on the basis of the original infrared high absorption carbon aerogel filler, and then combines the specific pore size of the diatomite with large particle size to promote the formation of a extinction trap capable of reflecting repeatedly under the microcosmic surface of the coating, so that incident light can reflect and absorb repeatedly between particles butted by the diatomite and the pore size of the diatomite, the reflectivity is further reduced, the light absorption performance of the coating is optimized, and the infrared low reflection and high absorptivity are realized. The coating paint can be used for imaging products such as a space infrared camera, an infrared telescope, an infrared spectrometer and the like which are used in the spectrum of 2-14 mu m, and has important effects on detection of weather, ocean, agricultural products and the like and military fields.
2. The absorptivity of the coating prepared by the invention in the wave band of 2-14 mu m is as high as 0.991, the bonding force of the coating is superior to that of grade 1 by using a cross-cut test, the minimum vacuum quality loss (TML) is 0.08%, and the minimum vacuum Condensable Volatile (CVCM) is 0.01%.
Drawings
FIG. 1 is a graph showing the infrared absorption spectrum of 2 to 14 μm of the coating layer 1# in example 1.
FIG. 2 is a graph showing the infrared absorption spectrum of 2 to 14 μm of the 2# coating in example 2.
FIG. 3 is a graph showing the infrared absorption spectrum of 2 to 14 μm of the 3# coating in example 3.
FIG. 4 is a photograph showing the particle size and pore diameter of the 100 mesh diatomaceous earth of example 1 after calcination.
Detailed Description
The present invention will be described with reference to specific examples, but embodiments of the present invention are not limited thereto. Experimental methods, in which specific conditions are not specified in examples, are generally available commercially according to conventional conditions as well as those described in handbooks, or according to general-purpose equipment, materials, reagents, etc. used under conditions suggested by manufacturers, unless otherwise specified. The raw materials required in the following examples and comparative examples are all commercially available.
Example 1
A 2-14 μm infrared band high absorption stray light eliminating coating paint, the coating paint comprising: primer, intermediate, and topcoat paints.
The preparation method of the primer comprises the following steps:
(1) 100g of emulsion type methacrylic resin, 30g of sulfuric acid modified carbon aerogel, 10g of Lu Borun Solsperse20000 dispersant EF, 500g of water and 900g of glass beads are added into a container A1;
(2) And (3) placing the container A1 in the step (1) in a sanding and stirring device, dispersing for 2 hours at 2500r/min, and filtering the glass beads to obtain a bottom paint, wherein the bottom paint can be coated.
The preparation method of the intermediate layer paint comprises the following steps:
(3) 100g of emulsion type methacrylic resin, 30g of sulfuric acid modified carbon aerogel, 50g of Lu Borun Solsperse20000 dispersing agent, 800g of water and 900g of glass beads are added into a container A2;
(4) Placing the container A2 in the step (3) in a sanding and stirring device, dispersing for 2 hours at 2500r/min, and filtering glass beads to form black color paste in the container B2;
(5) 500g of modified diatomite is added into the black color paste of the container B2, and the intermediate layer paint is obtained after 1600r/min mechanical stirring for 2 hours, and can be coated.
The preparation method of the surface paint comprises the following steps:
(6) 100g of emulsion type methacrylic resin, 70g of sulfuric acid modified carbon aerogel, 60g of Lu Borun Solsperse20000 dispersing agent, 800g of water and 2100g of glass beads are added into a container A3;
(7) Placing the container A3 in the step (6) in a sanding and stirring device, dispersing for 2 hours at 2500r/min, and filtering glass beads to form black color paste in the container B3;
(8) 150g of modified diatomite is added into the black color paste of the container B3, and the surface paint is obtained after 1600r/min mechanical stirring for 2 hours, and can be coated.
The preparation method of the 2-14 mu m infrared band high absorption stray light eliminating coating comprises the following steps:
uniformly spraying the bottom paint in the step (2) on an aluminum alloy substrate test piece in an air spraying mode by a spray gun, spraying for 4 times, and standing at room temperature for 12 hours;
uniformly spraying the middle layer paint in the step (5) on the bottom paint by adopting a spray gun air spraying mode, spraying for 5 times, and standing for 12 hours at room temperature;
and finally, uniformly spraying the surface layer paint in the step (8) on the middle layer paint by adopting a spray gun air spraying mode, spraying for 2 times, standing at room temperature for 4 hours, and baking at 80 ℃ for 12 hours to obtain the infrared stray light coating No. 1.
In this embodiment, the preparation method of the sulfuric acid modified carbon aerogel comprises the following steps:
(1) Adding 10g of carbon aerogel and 800ml of 80% concentrated sulfuric acid into a round-bottom flask, refluxing at a constant temperature of 70 ℃ for 3 hours, naturally cooling to room temperature to obtain black suspension, wherein the specific surface area of the carbon aerogel is 2000m 2 Per gram, density 0.2g/cm 3 ；
(2) Carrying out suction filtration on the black suspension obtained in the step (1) on a Buchner funnel to obtain black powder, and repeatedly flushing the black powder with deionized water until the flushing liquid is colorless and transparent;
(3) And (3) drying the black powder subjected to suction filtration in the step (2) to obtain sulfuric acid modified carbon aerogel powder which is used for preparing the paint.
In this embodiment, the preparation method of the modified diatomite comprises the following steps:
(1) Dispersing 300g of diatomite with water, soaking for 24 hours, and drying through meshes (100 meshes) after ultrasonic treatment.
(2) And (3) calcining the diatomite purified in the step (1) at a high temperature, wherein the calcining temperature is raised to 750 ℃ from room temperature, the heating rate is controlled to be 5 ℃/min, and the diatomite is naturally cooled for standby after heat preservation for 3 hours.
(3) Adding the calcined and reamed diatomite obtained in the step (2) into 1000g of deionized water, and adding 6g of Xinyue KBM-403 silane coupling agent to form a solution.
(4) And (3) carrying out ultrasonic treatment on the solution in the step (3) at 30 ℃ for 3 hours, filtering and drying to obtain the calcined hole-enlarging diatomite grafted by the silane coupling agent.
Fig. 4 is a photograph of the local pore size microtopography of the diatomite particles after calcination and reaming. As can be seen from FIG. 4, the modified diatomaceous earth particle size after reaming and before grafting is 100-150 μm, and the main micropore size distribution range is 3-5 μm.
Through tests, the absorptivity of the coating 1# prepared in the embodiment 1 in the wave band of 2-14 μm is 0.991, the average thickness of the coating is 442 μm, the bonding force of the coating is 1 grade, the vacuum quality loss (TML) is 0.08%, the vacuum Condensable Volatile (CVCM) is 0.01%, and the coating has rough and compact appearance and is free from powder falling when touching.
Example 2
Sulfuric acid modified carbon aerogel and modified diatomaceous earth prepared in example 1 were used.
A 2-14 μm infrared band high absorption stray light eliminating coating paint, the coating paint comprising: primer, intermediate, and topcoat paints.
The preparation method of the primer comprises the following steps:
(1) 100g of emulsion type methacrylic resin, 45g of sulfuric acid modified carbon aerogel, 15g of Lu Borun Solsperse20000 dispersing agent, 500g of water and 1350g of glass beads are added into a container A1;
(2) And (3) placing the container A1 in the step (1) in a sanding and stirring device, dispersing for 2 hours at 2500r/min, and filtering the glass beads to obtain a bottom paint, wherein the bottom paint can be coated.
The preparation method of the intermediate layer paint comprises the following steps:
(3) 100g of emulsion type methacrylic resin, 45g of sulfuric acid modified carbon aerogel, 50g of Lu Borun Solsperse20000 dispersing agent, 800g of water and 1350g of glass beads are added into a container A2;
(4) Placing the container A2 in the step (3) in a sanding and stirring device, dispersing for 2 hours at 2500r/min, and filtering glass beads to form black color paste in the container B2;
(5) 600g of modified diatomite is added into the black color paste of the container B2, and the intermediate layer paint is obtained after 1600r/min mechanical stirring for 2 hours, and can be coated.
The preparation method of the surface paint comprises the following steps:
(6) 100g of emulsion type methacrylic resin, 80g of sulfuric acid modified carbon aerogel, 60g of Lu Borun Solsperse20000 dispersing agent, 800g of water and 2400g of glass beads are added into a container A3;
(7) Placing the container A3 in the step (6) in a sanding and stirring device, dispersing for 2 hours at 2500r/min, and filtering glass beads to form black color paste in the container B3;
(8) 200g of modified diatomite is added into the black color paste of the container B3, and the finished paint layer paint is obtained after 1600r/min mechanical stirring for 2 hours, and can be coated.
The preparation method of the 2-14 mu m infrared band high absorption stray light eliminating coating comprises the following steps:
uniformly spraying the bottom paint in the step (2) on an aluminum alloy substrate test piece in an air spraying mode by a spray gun, spraying for 4 times, and standing at room temperature for 12 hours;
uniformly spraying the middle layer paint in the step (5) on the bottom paint by adopting a spray gun air spraying mode, spraying for 4 times, and standing at room temperature for 12 hours;
and finally, uniformly spraying the surface layer paint in the step (8) on the middle layer paint by adopting a spray gun air spraying mode, spraying for 1 time, standing at room temperature for 4 hours, and baking at 80 ℃ for 12 hours to obtain the infrared stray light coating No. 2.
Through tests, the absorptivity of the coating 2# prepared in the embodiment 2 in the wave band of 2-14 μm is 0.986, the average thickness of the coating is 398 μm, the bonding force of the coating is 1 grade, the vacuum quality loss (TML) is 0.09%, the vacuum Condensable Volatile (CVCM) is 0.03%, and the coating has a rough and compact appearance and is free from powder falling to the touch.
Example 3
Sulfuric acid modified carbon aerogel and modified diatomaceous earth prepared in example 1 were used.
A 2-14 μm infrared band high absorption stray light eliminating coating paint, the coating paint comprising: primer, intermediate, and topcoat paints.
The preparation method of the primer comprises the following steps:
(1) 100g of water-soluble methacrylic resin, 30g of sulfuric acid modified carbon aerogel, 10g of Lu Borun Solsperse47000 dispersant, 500g of water, 900g of glass beads were added to vessel A1;
(2) And (3) placing the container A1 in the step (1) in a sanding and stirring device, dispersing for 1h at 3000r/min, and filtering the glass beads to obtain a bottom paint, wherein the bottom paint can be coated.
The preparation method of the intermediate layer paint comprises the following steps:
(3) 100g of water-soluble methacrylic resin, 30g of sulfuric acid modified carbon aerogel, 50g of Lu Borun Solsperse47000 dispersant, 800g of water, 900g of glass beads were added to vessel A2;
(4) Placing the container A2 in the step (3) in a sanding and stirring device, dispersing for 1h at 3000r/min, and filtering glass beads to form black color paste in the container B2;
(5) 500g of modified diatomite is added into the black color paste of the container B2, and the intermediate layer paint is obtained after mechanical stirring for 1h at 2000r/min, and can be coated.
The preparation method of the surface paint comprises the following steps:
(6) 100g of water-soluble methacrylic resin, 70g of sulfuric acid modified carbon aerogel, 60g of Lu Borun Solsperse47000 dispersant, 800g of water, 2100g of glass beads were added to vessel A3;
(7) Placing the container A3 in the step (6) in a sanding and stirring device, dispersing for 1h at 3000r/min, and filtering glass beads to form black color paste in the container B3;
(8) 150g of modified diatomite is added into the black color paste of the container B3, and the surface paint is obtained after mechanical stirring for 1h at 2000r/min, and can be coated.
The preparation method of the 2-14 mu m infrared band high absorption stray light eliminating coating comprises the following steps:
uniformly spraying the bottom paint in the step (2) on an aluminum alloy substrate test piece in an air spraying mode of a spray gun, spraying for 3 times, and standing at room temperature for 12 hours;
uniformly spraying the middle layer paint in the step (5) on the bottom paint by adopting a spray gun air spraying mode, spraying for 5 times, and standing for 12 hours at room temperature;
and finally, uniformly spraying the surface layer paint in the step (8) on the middle layer paint by adopting a spray gun air spraying mode, spraying for 2 times, standing at room temperature for 4 hours, and baking at 80 ℃ for 12 hours to obtain the infrared stray light coating 3#.
Through tests, the absorptivity of the coating 3# prepared in the embodiment 3 in the wave band of 2-14 μm is 0.984, the average thickness of the coating is 440 μm, the bonding force of the coating is 1 grade, the vacuum quality loss (TML) is 0.08%, the vacuum Condensable Volatile (CVCM) is 0.02%, and the coating has a rough and compact appearance and is free from powder falling when touched.
Comparative example 1 (diatomaceous earth particle size uniformity, small pore size-uncalcined reaming)
The preparation methods of the primer, the intermediate layer and the top layer paint of the coating and the preparation method of the infrared band high-absorption stray light eliminating coating are identical to those of the example 1 except for the preparation method of the modified diatomite.
The preparation method of the modified diatomite adopted in the comparative example comprises the following steps:
(1) Dispersing 300g of diatomite with water, then soaking for 24 hours, and drying through meshes (100 meshes) after ultrasonic treatment;
(2) Adding the diatomite cleaned and dried in the step (1) into 1000g of deionized water, and then adding 6g of Xinyue KBM-403 silane coupling agent to form a solution;
(3) And (3) carrying out ultrasonic treatment on the solution in the step (2) at 30 ℃ for 3 hours, filtering and drying to obtain the silane coupling agent grafted but uncalcined hole-enlarging diatomite.
Through tests, the absorptivity of the coating 4# prepared in the comparative example 1 in the wave band of 2-14 mu m is 0.971, the average thickness of the coating is 433 mu m, the bonding force of the coating is 1 grade, the vacuum quality loss (TML) is 0.09%, the vacuum Condensable Volatile (CVCM) is 0.05%, and the coating is coarse and compact in appearance and does not fall off powder when touched.
Therefore, the diatomite adopted in the comparative example is not calcined and reamed, belongs to the primary aperture of the diatomite with 100 meshes, has the aperture size smaller than 2 mu m, does not have light trapping matching characteristics for incident light in the infrared band, and obviously reduces the anti-reflection performance.
Comparative example 2 (diatomaceous earth having a small particle size and a small pore size)
The comparative example was identical to example 1 except that the diatomaceous earth used was 200 mesh primary, and the preparation methods of the primer, intermediate, and topcoat paints, the calcination reaming and silane coupling agent grafting methods of diatomaceous earth, and the preparation methods of the infrared band high absorption clutter-removing coating were all identical.
Through tests, the absorptivity of the coating 5# prepared in the comparative example 2 in the wave band of 2-14 μm is 0.964, the average thickness of the coating is 382 μm, the bonding force of the coating is 1 grade, the vacuum quality loss (TML) is 0.09%, the vacuum Condensable Volatile (CVCM) is 0.01%, and the coating has a rough and compact appearance and is free from powder falling when touched.
Therefore, although the diatomite adopted in the comparative example is subjected to calcination reaming treatment, the original soil particle size and the pore diameter are smaller, the pore diameter is still smaller than 1 μm after high-temperature calcination, a loose and porous middle layer cannot be constructed due to the too low particle diameter, and the diatomite has no light trapping matching characteristic for long-wave band infrared incident light penetrating through a finish paint layer, so that the anti-reflection performance is remarkably reduced.
Comparative example 3 (coating hierarchy thickness non-uniformity)
The preparation of the primer, intermediate and top coats of the coating of this comparative example was identical to that of example 1.
The preparation method of the 2-14 mu m infrared band high absorption stray light eliminating coating comprises the following steps:
the primer paint of the step (2) in the example 1 is uniformly sprayed on an aluminum alloy substrate test piece by adopting a spray gun air spraying mode, sprayed for 3 times and placed at room temperature for 12 hours.
And (3) uniformly spraying the intermediate layer paint in the step (5) in the embodiment 1 on the bottom paint by adopting a spray gun air spraying mode, spraying for 1 time, and standing at room temperature for 12 hours.
And finally, uniformly spraying the surface layer paint in the step (8) in the embodiment 1 on the middle layer paint by adopting a spray gun air spraying mode, spraying for 2 times, standing for 4 hours at room temperature, and baking for 12 hours at 80 ℃ to obtain the infrared stray light coating 6#.
Through tests, the absorptivity of the coating 6# prepared in the comparative example 3 in the wave band of 2-14 mu m is 0.970, the average thickness of the coating is 256 mu m, the bonding force of the coating is 1 grade, the vacuum quality loss (TML) is 0.08%, the vacuum Condensable Volatile (CVCM) is 0.01%, and the coating has compact appearance and does not fall off powder when touching.
Therefore, the paint of the middle layer of the comparative example has fewer spraying passes, the thickness of the formed coating of the middle layer is lower, the large gap and the insufficient porous degree of the microstructure built by diatomite with high content and large particle diameter are caused, the infrared incident light penetrating through the surface layer does not generate multiple light trapping and diffuse reflection in the middle layer, the probability of contacting the light absorbing carbon aerogel filler is reduced, and finally the anti-reflection performance is obviously reduced.
Comparative example 4 (Single layer coating)
The comparative example uses the sulfuric acid modified carbon aerogel and modified diatomaceous earth prepared in example 1, and the preparation method of the 2-14 μm infrared band high absorption stray light eliminating coating paint is identical to that of the intermediate layer paint prepared in example 1.
The preparation method of the 2-14 mu m infrared band high absorption stray light eliminating coating comprises the following steps:
and (3) uniformly spraying the intermediate layer paint in the embodiment 1 on the bottom paint by adopting a spray gun air spraying mode, spraying for 6 times, standing at room temperature for 12 hours, and baking at 80 ℃ for 12 hours to obtain the infrared stray light coating 7#.
Through tests, the absorptivity of the coating 7# prepared in the comparative example 4 in the wave band of 2-14 μm is 0.978, the average thickness of the coating is 301 μm, the bonding force of the coating is 3 grade, the vacuum quality loss (TML) is 0.15%, the vacuum Condensable Volatile (CVCM) is 0.04%, the appearance of the coating can observe the phenomenon of exposing a substrate and the phenomenon of powder falling occurs when the coating touches.
Therefore, the coating 7# prepared in the comparative example has the defect that the coating is insufficient in wettability in the process of bonding the resin and the substrate due to the fact that the content of the filler (modified carbon aerogel and modified diatomite) is too high, and the binding force with the substrate is obviously reduced because the resin is mainly used for coating the filler. Meanwhile, the infrared absorption rate, the appearance covering power, the vacuum quality loss and other performances of the coating 7# are obviously reduced due to no assistance of the bottom layer and the surface layer.
Comparative example 5 (Filler ratio in topcoat paint is too low)
This comparative example uses the sulfuric acid modified carbon aerogel prepared in example 1 and modified diatomaceous earth. The primer and intermediate paint of the coating of this comparative example were prepared in the same manner as in example 1.
The preparation method of the surface paint comprises the following steps:
(1) 100g of emulsion type methacrylic resin, 30g of sulfuric acid modified carbon aerogel, 30g of Lu Borun Solsperse20000 dispersant, 800g of water, 900g of glass beads were added to vessel A1.
(2) And (3) placing the container A1 in the step (1) in a sanding and stirring device, dispersing for 2 hours at 2500r/min, and filtering the glass beads to form black color paste in the container B1.
(3) 80g of modified diatomite is added into the black color paste of the container B1, and the surface paint is obtained after 1600r/min mechanical stirring for 2 hours, and can be coated.
The preparation method of the infrared band high absorption stray light eliminating coating of the comparative example is the same as that of example 1.
Through tests, the absorptivity of the coating 8# prepared in the comparative example 5 in the wave band of 2-14 μm is 0.972, the average thickness of the coating is 293 μm, the bonding force of the coating is 1 grade, the vacuum quality loss (TML) is 0.07%, the vacuum Condensable Volatile (CVCM) is 0.01%, and the coating has rough and compact appearance and does not fall off powder when touching.
It can be seen that the coating 8# prepared in this comparative example has significantly reduced absorptivity of the coating 8# in the 2-14 μm band due to the reduced filler (modified carbon aerogel and modified diatomaceous earth) content in the topcoat paint.
Comparative example 6 (top coat paint with too high filler ratio)
This comparative example uses the sulfuric acid modified carbon aerogel prepared in example 1 and modified diatomaceous earth. The primer and intermediate paint of the coating of this comparative example were prepared in the same manner as in example 1.
The preparation method of the finishing paint layer paint comprises the following steps:
(1) 100g of emulsion type methacrylic resin, 120g of sulfuric acid modified carbon aerogel, 100g of Lu Borun Solsperse20000 dispersant, 800g of water, 3600g of glass beads were added to vessel A.
(2) And (3) placing the container A in the step (1) in a sanding and stirring device, dispersing for 2 hours at 2500r/min, and filtering glass beads to form black color paste in the container B.
(3) 220g of modified diatomite is added into the black color paste of the container B, and the paint is obtained after 1600r/min mechanical stirring for 2 hours, and can be coated.
The preparation method of the infrared band high absorption stray light eliminating coating of the comparative example is the same as that of example 1.
Through tests, the coating 9# prepared in the comparative example 6 has obvious powder falling phenomenon, the infrared absorption rate, thickness and binding force of the coating cannot be tested, the vacuum quality loss (TML) of the coating 8# is 2.33%, the vacuum Condensable Volatile (CVCM) is 0.05%,
therefore, the coating 9# prepared in the comparative example has too high content of filler (modified carbon aerogel and modified diatomite) in the surface layer paint, so that the surface layer resin cannot effectively coat the filler, and multiple tests cannot be performed after the powder falling phenomenon occurs.
The coating performance test method in the specific embodiment is as follows:
(1) The infrared absorption spectrum curve of the coating with the wave band of 2-14 mu m iS tested by a Nicolet iS50 infrared spectrometer, and the infrared reflectivity of the coating with the wave band of 2-14 mu m iS calculated by an integrating sphere reflection method.
(2) According to QJ 1558B-2016 'method for testing the volatility of a material in vacuum', the volatility of a coating material in a vacuum environment is detected, the indexes of vacuum quality loss (TML) and vacuum condensable volatile matter (CVCM) of the coating material are detected, the lower the numerical value of the two indexes is, the better the volatility resistance in a vacuum low-temperature environment is, and the lower the pollution degree of a lens for optical load is.
(3) Coating binding force test reference standard GB/T5210-2006, paint and varnish pull-off method adhesion test, the coating is diced, then a 3M adhesive tape is used for adhering to the diced position and pulling up quickly, the coating falling-off condition is observed, and the coating binding force is verified by reference to the standard rating.
The results of the coating performance test of each example and comparative example are shown in tables 1 and 2.
TABLE 1
| Sequence number | Example 1 | Example 2 | Example 3 |
| The absorptivity of the coating in the wave band of 2-14 mu m | 0.991 | 0.986 | 0.984 |
| Vacuum coating (TML) | 0.08％ | 0.09％ | 0.08％ |
| Coating vacuum Condensable Volatile (CVCM) | 0.01％ | 0.03％ | 0.02％ |
| Appearance state of coating | Matte black | Matte black | Matte black |
| State of coating binding force | Level 1 | Level 1 | Level 1 |
TABLE 2
| Sequence number | Comparative example 1 | Comparative example 2 | Comparative example 3 |
| The absorptivity of the coating in the wave band of 2-14 mu m | 0.971 | 0.964 | 0.970 |
| Vacuum coating (TML) | 0.09％ | 0.09％ | 0.08％ |
| Coating vacuum Condensable Volatile (CVCM) | 0.05％ | 0.01％ | 0.01％ |
| Appearance state of coating | Matte black | Matte black | Matte black |
| State of coating binding force | Is better than grade 1 | Is better than grade 1 | Is better than grade 1 |
| Sequence number | Comparative example 4 | Comparative example 5 | Comparative example 6 |
| Coating 2-14 mu m waveSection absorptivity | 0.978 | 0.972 | Failure to test |
| Vacuum coating (TML) | 0.15％ | 0.07％ | 2.33％ |
| Coating vacuum Condensable Volatile (CVCM) | 0.04％ | 0.01％ | 0.05％ |
| Appearance state of coating | Matte black dew substrate | Matte black | Powder falling off |
| State of coating binding force | 3 grade | Level 1 | Failure to test |
Claims (7)
1. The 2-14 mu m infrared band high-absorption stray light eliminating coating is characterized by comprising the following preparation method:
sequentially spraying a bottom paint, a middle paint and a surface paint on a substrate test piece, and curing to obtain a stray light eliminating coating;
the coating paint comprises: a primer paint, a middle paint and a top paint;
the primer paint comprises: aqueous methacrylic resin, modified carbon aerogel, dispersing aid and water; the mass ratio of the materials is (0.9-1.1), (0.3-0.5), (0.1-0.2) and (4-6) in sequence;
the intermediate layer paint comprises: aqueous methacrylic resin, modified carbon aerogel, modified diatomite, a dispersing aid and water; the mass ratio of the materials is (0.9-1.1), (0.3-0.5), (4-6), (0.5-1) and (8-10) in sequence;
the topcoat paint comprises: aqueous methacrylic resin, modified carbon aerogel, modified diatomite, a dispersing aid and water; the mass ratio of the materials is (0.9-1.1), (0.6-1), (1-2), (0.5-1) and (8-10) in sequence;
wherein the modified carbon aerogel is carbon aerogel modified by sulfuric acid, and the specific surface area of the carbon aerogel is 1500-4000m 2 Per gram, the density is 0.1-0.5 g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the The modified diatomite is obtained by reaming diatomite and grafting a silane coupling agent, wherein the grain diameter of the modified diatomite after reaming and before grafting is 100-150 mu m, and the pore diameter of the modified diatomite is 3-5 mu m;
the aqueous methacrylic resin, modified carbon aerogel, modified diatomaceous earth, and dispersion aid in the primer, intermediate, and topcoat paints may be the same or different from each other;
the preparation method of the modified diatomite comprises the following steps:
(1) Dispersing diatomite with water, soaking, ultrasonic treating, and stoving;
(2) Calcining the purified diatomite in the step (1) at a high temperature, wherein the calcining temperature is raised to 700-800 ℃ from room temperature, the heating rate is controlled to be 5-10 ℃/min, and the diatomite is naturally cooled for standby after heat preservation for 2-3 hours;
(3) Adding the diatomite calcined and reamed in the step (2) into water, and then adding a silane coupling agent for grafting modification to form a solution; the mass ratio of the silane coupling agent to the diatomite is (0.1-0.4): 10;
(4) Carrying out ultrasonic treatment on the solution obtained in the step (3) at 20-40 ℃ for 1-5 hours, filtering and drying to obtain modified diatomite;
the preparation method of the modified carbon aerogel comprises the following steps:
(1) Refluxing carbon aerogel and concentrated sulfuric acid at a constant temperature of 50-70 ℃ for 3-6 hours, and naturally cooling to room temperature to obtain black suspension;
(2) And (3) carrying out suction filtration on the black suspension obtained in the step (1) to obtain black powder, washing and drying to obtain the modified carbon aerogel.
2. The coating according to claim 1, wherein the aqueous methacrylic resin is one or more selected from the group consisting of water-soluble methacrylic resin, emulsion methacrylic resin, water-dispersible methacrylic resin, and surface layer paint;
in the bottom paint, the middle paint and the surface paint, the dispersing auxiliary agent adopts one or more of road-rinse Solsperse20000, solsperse24000 and Solsperse 47000.
3. The coating of claim 1, wherein the method of preparing the primer comprises the steps of:
(1) Sequentially adding aqueous methacrylic resin, modified carbon aerogel, a dispersing aid, water and glass beads into a container A1; wherein, the mass ratio of the aqueous methacrylic resin to the modified carbon aerogel to the modified diatomite to the dispersing aid to the water is (0.9-1.1): (0.3-0.5): (0.1-0.2): (4-6);
the modified carbon aerogel is carbon aerogel modified by sulfuric acid, and the specific surface area of the carbon aerogel is 1500-4000m 2 Per gram, the density is 0.1-0.5 g/cm 3 ；
(2) And (3) placing the container A1 in the step (1) in a sanding and stirring device, stirring the paint, uniformly dispersing the paint, and filtering the glass beads to obtain the bottom paint.
4. A coating according to claim 3, wherein the method of preparing the intermediate layer paint comprises the steps of:
(1) Adding aqueous methacrylic resin, a dispersing aid, water, modified carbon aerogel and glass beads into a container A2;
(2) Placing the container A2 in the step (1) in a sanding and stirring device, stirring, and filtering glass beads to form black color paste in the container B2;
(3) Adding the modified diatomite into the black color paste of the container B2, and stirring to obtain an intermediate layer paint;
wherein, the aqueous methacrylic resin, the modified carbon aerogel, the modified diatomite, the dispersing auxiliary and the water; according to the sequential mass ratio of (0.9-1.1), (0.3-0.5), (4-6), (0.5-1), (8-10);
the modified carbon aerogel is carbon aerogel modified by sulfuric acid, and the specific surface area of the carbon aerogel is 1500-4000m 2 Per gram, the density is 0.1-0.5 g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the The modified diatomite is obtained by expanding holes and grafting a silane coupling agent, and the particle size of the modified diatomite after expanding holes and before grafting is 100-150 mu m, and the pore size is 3-5 mu m.
5. A coating according to claim 3, wherein the method of preparing the topcoat paint comprises the steps of:
(1) Adding aqueous methacrylic resin, a dispersing aid, water, modified carbon aerogel and glass beads into a container A3;
(2) Placing the container A3 in the step (1) in a sanding and stirring device, stirring, and filtering glass beads to form black color paste in the container B3;
(3) Adding the modified diatomite into the black color paste of the container B3, and stirring to obtain a surface layer paint;
wherein, the aqueous methacrylic resin, the modified carbon aerogel, the modified diatomite, the dispersing auxiliary and the water; according to the sequential mass ratio of (0.9-1.1), (0.3-0.5), (4-6), (0.5-1), (8-10);
the modified carbon aerogel is carbon aerogel modified by sulfuric acid, and the specific surface area of the carbon aerogel is 1500-4000m 2 Per gram, the density is 0.1-0.5 g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the The modified diatomite is obtained by expanding the pores of diatomite and grafting a silane coupling agent, the particle diameter of the modified diatomite after expanding the pores and before grafting is 100-150 mu m, and the pore diameter is3～5μ。
6. Use of a stray light removing coating according to claim 1 for absorbing stray light in the wavelength range of 2 to 14 μm.
7. Use of a coating according to claim 1 for absorbing parasitic light in the wavelength band of 2-14 μm in a spatial infrared optical system.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102874791A (en) * | 2011-07-15 | 2013-01-16 | 同济大学 | Method for preparing hierarchical porous nano carbon materials |
| CN110791192A (en) * | 2019-11-18 | 2020-02-14 | 复旦大学 | Super-black coating and preparation method thereof |
| CN115322641A (en) * | 2022-08-25 | 2022-11-11 | 北京星驰恒动科技发展有限公司 | High-absorptivity stray light inhibition coating and preparation method and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102874791A (en) * | 2011-07-15 | 2013-01-16 | 同济大学 | Method for preparing hierarchical porous nano carbon materials |
| CN110791192A (en) * | 2019-11-18 | 2020-02-14 | 复旦大学 | Super-black coating and preparation method thereof |
| CN115322641A (en) * | 2022-08-25 | 2022-11-11 | 北京星驰恒动科技发展有限公司 | High-absorptivity stray light inhibition coating and preparation method and application thereof |
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