CN113061375A - Heat-insulating coating and preparation method thereof - Google Patents
Heat-insulating coating and preparation method thereof Download PDFInfo
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- CN113061375A CN113061375A CN202110329555.0A CN202110329555A CN113061375A CN 113061375 A CN113061375 A CN 113061375A CN 202110329555 A CN202110329555 A CN 202110329555A CN 113061375 A CN113061375 A CN 113061375A
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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
- C09D133/00—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 only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
- C09D133/04—Homopolymers or copolymers of esters
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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
- 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
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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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
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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
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/003—Additives being defined by their diameter
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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
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/004—Additives being defined by their length
Abstract
The application discloses a high-strength aerogel thermal insulation coating and a preparation method thereof, wherein the high-strength aerogel thermal insulation coating comprises 25-30 parts of pure acrylic emulsion, 15-20 parts of aerogel particles, 6-8 parts of kaolin, 3-5 parts of calcium sulfate whiskers, 25-30 parts of deionized water and 2-5 parts of processing aids; the length-diameter ratio of the calcium sulfate whisker is 50-60. This application is through having added the calcium sulfate whisker in coating, utilizes the intensity and the toughness of fibre micron structure to share stress, improves the whole mechanical strength of compound aerogel, and this application has adopted the calcium sulfate whisker that draw ratio is 50 simultaneously, makes the calcium sulfate whisker of load to the stress homogenization, reduces the fragility of aerogel to improve coating material's toughness and mechanical strength by a wide margin.
Description
Technical Field
The application relates to the field of heat-insulating coatings, in particular to a high-strength aerogel heat-insulating coating and a preparation method thereof.
Background
The heat-insulating coating is one kind of heat-insulating material. The thermal insulation material requires that the thermal conductivity of the material is not more than 0.14W/(M.k). The types of the heat-insulating coating are different and have different characteristics, but most of the heat-insulating coatings improve the comprehensive performance of the heat-insulating coating by reducing the heat conductivity coefficient and improving one or more of the light reflection and radiation effects. The existing heat-insulating coating has the characteristics that: the dosage is less, the construction is easy, and the environment adaptability is strong; the curing formability is good, the material is not easy to be damaged, and most of the material has good acid resistance and alkali resistance; the adhesive property with the body to be protected is good, the viscosity is strong, and no hole or thermal bridge effect exists; the coating film has thin thickness and small mass after curing, and can be constructed on various organism surfaces (such as houses and bridges) and equipment needing protection in various ways (such as spraying, smearing and the like).
The pores in the aerogel space network structure can well obstruct solid heat conduction and prolong the air heat convection path, thereby keeping lower heat conductivity. In addition, the pore walls of a large number of aerogel open pore structures are equivalent to the reflection surfaces and the refraction surfaces of infinite heat radiation, so that heat loss caused by the heat radiation can be greatly inhibited, and the aerogel open pore structures are widely used in thermal insulation coatings.
While pure SiO2The aerogel has low strength and poor toughness, and when the aerogel is added into the thermal insulation coating for use, the strength of the coating is reduced, and the toughness is reduced.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art.
In view of the above, the invention provides a high-strength aerogel thermal insulation coating, and a coating formed by the high-strength aerogel thermal insulation coating has good strength and toughness and excellent mechanical properties.
The invention also provides a preparation method of the high-strength aerogel thermal insulation coating, which is simple in preparation steps and improves the preparation efficiency.
The high-strength aerogel thermal insulation coating comprises 25-30 parts of pure acrylic emulsion, 15-20 parts of aerogel particles, 6-8 parts of kaolin, 3-5 parts of calcium sulfate whiskers, 25-30 parts of deionized water and 2-5 parts of a processing aid; the length-diameter ratio of the calcium sulfate whisker is 50-60.
According to the high-strength aerogel thermal insulation coating disclosed by the embodiment of the invention, the calcium sulfate whiskers are added into the coating, the aerogel and the calcium sulfate whiskers are compounded, the fiber is used as a reinforcing phase, the fiber-reinforced aerogel thermal insulation material with excellent thermal insulation performance and certain strength is prepared, the stress is shared by the strength and toughness of a fiber microstructure, and the overall mechanical strength of the composite aerogel is improved.
The high-strength aerogel thermal insulation coating provided by the embodiment of the invention can also have the following additional technical characteristics:
according to one embodiment of the invention, the high-strength aerogel thermal insulation coating further comprises 10-15 parts by weight of hollow microsphere particles.
According to one embodiment of the invention, the hollow microsphere particle material is prepared by the following scheme: (1) adding carbon microspheres into an ethanol solution with the mass fraction of 35% according to the mass ratio of 1: 8-10, stirring, mixing and collecting a suspension, stirring and mixing the suspension and a zinc nitrate solution with the mass fraction of 25% according to the mass ratio of 1:1, continuing ultrasonic treatment, and collecting a mixed solution; (2) and (3) keeping the temperature of the mixed solution and drying, filtering and collecting a filter cake, washing, keeping the temperature and calcining, standing and cooling to room temperature, and grinding and sieving with a 2000-mesh sieve to obtain the hollow microsphere particles.
According to an embodiment of the invention, the temperature of the heat preservation calcination treatment in the step (2) is 450-550 ℃.
According to one embodiment of the invention, the high-strength aerogel thermal insulation coating further comprises 6-8 parts of silica sol with a solid content of 15%.
According to one embodiment of the invention, the pure acrylic emulsion has a solid content of 35-40%.
The preparation method of the high-strength aerogel thermal insulation coating according to the embodiment of the second aspect of the invention comprises the following preparation steps: s1, preparing a base liquid: adding silica sol into the pure acrylic emulsion according to the formula, stirring, mixing, performing ultrasonic dispersion, and collecting to obtain a base fluid; s2, preparing aerogel slurry: stirring and mixing the processing aid, aerogel and deionized water at a low speed according to a formula, placing the mixture into a dispersing device, grinding and dispersing the mixture, and collecting aerogel slurry; s3, preparing a heat-insulating coating: mixing the aerogel slurry, the base fluid, the kaolin and the calcium sulfate whiskers according to a formula, placing the mixture in a stirrer for high-speed stirring, collecting the stirred mixed solution, placing the mixed solution in a grinding device, grinding and dispersing the mixed solution, and screening the ground mixed solution through a screen to obtain the high-strength aerogel thermal insulation coating.
According to an embodiment of the invention, the low-speed stirring speed in the step S2 is 250-300 r/min.
According to an embodiment of the invention, the high-speed stirring speed in the step S3 is 650-800 r/min.
According to an embodiment of the present invention, the mesh size of step S3 is 0.25-0.28 μm.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Detailed Description
Reference will now be made in detail to the embodiments of the present invention, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The following examples are illustrative only and are not to be construed as limiting the invention.
The following describes a high-strength aerogel thermal insulation coating and a preparation method thereof according to an embodiment of the present invention.
Firstly, the high-strength aerogel thermal insulation coating comprises 25-30 parts of pure acrylic emulsion, 15-20 parts of aerogel particles, 6-8 parts of kaolin, 3-5 parts of calcium sulfate whiskers, 25-30 parts of deionized water and 2-5 parts of a processing aid; the length-diameter ratio of the calcium sulfate whisker is 50-60.
Therefore, according to the high-strength aerogel thermal insulation coating provided by the embodiment of the invention, the calcium sulfate whiskers are added into the coating, the aerogel and the calcium sulfate whiskers are compounded, the fiber is used as a reinforcing phase, the fiber-reinforced aerogel thermal insulation material with excellent thermal insulation performance and certain strength is prepared, the strength and toughness of a fiber microstructure are utilized to share stress, the overall mechanical strength of the composite aerogel is improved, meanwhile, the calcium sulfate whiskers with the length-diameter ratio of 50 are adopted, the loaded calcium sulfate whiskers are homogenized to the stress, the brittleness of the aerogel is reduced, and the toughness and the mechanical strength of the coating material are greatly improved.
According to one embodiment of the invention, the high-strength aerogel thermal insulation coating further comprises 10-15 parts by weight of hollow microsphere particles.
Through adopting above-mentioned technical scheme, this application sets up hollow microsphere granule in aerogel heat preservation coating's inside, because hollow microsphere granule has good thermal-insulated effect on the one hand, can effectively improve aerogel coating's heat-proof quality, on the other hand, hollow microsphere granule can effectively be filled to the coating inside and evenly dispersed in aerogel material's pore structure, as the structure anchor point between aerogel material and the coating basic unit, thereby in the in-service use process, the mechanical properties on coating surface has been improved, thereby can improve coating material's toughness and mechanical strength by a wide margin.
In some embodiments of the invention, the hollow microsphere particulate material is made according to the following scheme: (1) adding carbon microspheres into an ethanol solution with the mass fraction of 35% according to the mass ratio of 1: 8-10, stirring, mixing and collecting a suspension, stirring and mixing the suspension and a zinc nitrate solution with the mass fraction of 25% according to the mass ratio of 1:1, continuing ultrasonic treatment, and collecting a mixed solution; (2) and (3) keeping the temperature of the mixed solution and drying, filtering and collecting a filter cake, washing, keeping the temperature and calcining, standing and cooling to room temperature, and grinding and sieving with a 2000-mesh sieve to obtain the hollow microsphere particles.
By adopting the technical scheme, the heat preservation calcining treatment temperature in the step (2) is 450-550 ℃.
According to the preparation method, the calcining temperature is optimized, the calcining treatment and effective forming of the prepared hollow microsphere material are carried out at the temperature by improving the calcining temperature, and the carbon microsphere template filled in the hollow microsphere material effectively reacts with oxygen and is dispersed and escaped, so that the prepared hollow microsphere has good structural performance, and the toughness and the mechanical strength of the coating material are further greatly improved.
Further, the high-strength aerogel thermal insulation coating also comprises 6-8 parts of silica sol with the solid content of 15%.
This application has added silica sol and has inject its solid content in the coating, through the effective addition of silica sol, because silica sol when losing moisture, monomer silicic acid polymerizes gradually into high polymeric silica gel, along with the evaporation of moisture, the colloid molecule increases, form-SiO-O-SiO-inorganic polymer at last and scribble, there is stronger osmotic power to the basic unit through the inside silica fine particle of silica sol, can permeate to the inside of basic unit through capillary action, and can react with the calcium hydroxide in the concrete basic unit and generate calcium silicate, make the coating have stronger cohesive force, thereby mechanical strength and the mechanical properties of material have further been improved.
According to one embodiment of the invention, the pure acrylic emulsion has a solid content of 35-40%.
The application has optimized the solid content of pure acrylic emulsion, and the solid content of pure acrylic emulsion after through the optimization is unlikely to low excessively, prevents that its sagging performance is not good to with low coating solidification efficiency, reduced coating material's structural strength, prevent simultaneously that pure acrylic emulsion solid content is too high, lead to coating thickness control difficulty, thereby improved the anti-drop performance of coating.
In a second aspect, the present application provides a method for preparing a high-strength aerogel thermal insulation coating, wherein the preparation steps of the high-strength aerogel thermal insulation coating comprise: s1, preparing a base liquid: adding silica sol into the pure acrylic emulsion according to the formula, stirring, mixing, performing ultrasonic dispersion, and collecting to obtain a base fluid; s2, preparing aerogel slurry: stirring and mixing the processing aid, aerogel and deionized water at a low speed according to a formula, placing the mixture into a dispersing device, grinding and dispersing the mixture, and collecting aerogel slurry; s3, preparing a heat-insulating coating: mixing the aerogel slurry, the base fluid, the kaolin and the calcium sulfate whiskers according to a formula, placing the mixture in a stirrer for high-speed stirring, collecting the stirred mixed solution, placing the mixed solution in a grinding device, grinding and dispersing the mixed solution, and screening the ground mixed solution through a screen to obtain the high-strength aerogel thermal insulation coating.
From this, this application technical scheme is through preparing agent liquid earlier, again with processing aid and aerogel complex, and the scheme of final preparation coating can effectively improve aerogel thermal insulation coating's dispersion homogeneity performance to the thermal insulation coating that makes the preparation has good dispersion stability ability and mechanical strength.
According to an embodiment of the invention, the low-speed stirring speed in the step S2 is 250-300 r/min.
Through adopting above-mentioned technical scheme, the speed of low-speed stirring has been optimized in this application, because under the low-speed stirring state, when aerogel can effectively disperse in the basic body fluid, can prevent that aerogel pore isotructure from taking place to destroy and the phenomenon of collapsing under the high-speed stirring environment to the composite coating that makes the preparation has good mechanical strength and mechanical properties.
According to an embodiment of the invention, the high-speed stirring speed in the step S3 is 650-800 r/min.
By adopting the technical scheme, the stirring speed is increased in the final stirring environment, and the prepared coating material can be effectively improved to have good uniform dispersion performance and stability, so that the coating material has good mechanical strength and mechanical performance after the subsequent preparation of the composite coating is finished.
The aperture of the screen mesh in the step S3 is 0.25-0.28 μm.
The application has optimized the aperture of screen cloth, makes the coating of preparation have good degree of consistency and fineness, in the in-service use process, has improved the coarse structure on coating surface to the coating that makes its formation has good homogeneous stable structural performance, thereby has further improved mechanical properties and intensity.
In summary, in the high-strength aerogel thermal insulation coating provided by the embodiment of the invention, the calcium sulfate whiskers are added into the coating, the aerogel and the calcium sulfate whiskers are compounded, and the fiber is used as a reinforcing phase, so that the fiber-reinforced aerogel thermal insulation material which has excellent thermal insulation performance and certain strength is prepared, the strength and toughness of a fiber microstructure are utilized to share stress, the overall mechanical strength of the composite aerogel is improved, and meanwhile, the calcium sulfate whiskers with the length-diameter ratio of 50 are adopted, so that the loaded calcium sulfate whiskers are homogenized to the stress, the brittleness of the aerogel is reduced, and the toughness and mechanical strength of the coating material are greatly improved;
simultaneously, this application sets up hollow microsphere granule in aerogel heat preservation coating's inside, because hollow microsphere granule has good thermal-insulated effect on the one hand, can effectively improve aerogel coating's heat-proof quality, on the other hand, hollow microsphere granule can effectively be filled to the coating inside and the homodisperse in aerogel material's pore structure, as the structure anchor point between aerogel material and the coating basic unit, thereby in the in-service use process, the mechanical properties on coating surface has been improved, thereby can improve coating material's toughness and mechanical strength by a wide margin.
The high-strength aerogel thermal insulation coating and the preparation method thereof according to the present invention will be described in detail with reference to the following embodiments.
In the examples of the present application, the raw materials and the equipment used are as follows, but not limited thereto:
in the application, all raw materials and instruments and equipment can be obtained by market, and the specific models are as follows:
a precision reinforcement electric stirrer, an ultrasonic dispersion machine JAC-1 type, a basket type grinding machine (NM-075), an electric heating blowing drying box, an intelligent box type high-temperature furnace DC-B type and an electronic universal/tensile testing machine WDW-100.
Preparation example 1
Adding carbon microspheres with the particle size of 3 microns into an ethanol solution with the mass fraction of 35% according to the mass ratio of 1:10, stirring, mixing and collecting a suspension, stirring and mixing the suspension and a zinc nitrate solution with the mass fraction of 25% according to the mass ratio of 1:1, continuing to perform ultrasonic treatment for 25min, collecting a mixed solution, placing the mixed solution at 75 ℃ for heat preservation and drying for 10h, filtering and collecting a filter cake, washing for 3 times, then performing heat preservation and calcination treatment at 450 ℃ for 25min, standing, cooling to room temperature, and grinding through a 2000-mesh sieve to obtain hollow microsphere particles 1.
Preparation example 2
Adding carbon microspheres with the particle size of 4 microns into an ethanol solution with the mass fraction of 35% according to the mass ratio of 1:10, stirring, mixing and collecting a suspension, stirring and mixing the suspension and a zinc nitrate solution with the mass fraction of 25% according to the mass ratio of 1:1, continuing to perform ultrasonic treatment for 27min, collecting a mixed solution, placing the mixed solution at 80 ℃ for heat preservation and drying for 11h, filtering and collecting a filter cake, washing for 4 times, performing heat preservation and calcination treatment at 500 ℃ for 27min, standing, cooling to room temperature, and grinding through a 2000-mesh sieve to obtain hollow microsphere particles 2.
Preparation example 3
Adding carbon microspheres with the particle size of 5 micrometers into an ethanol solution with the mass fraction of 35% according to the mass ratio of 1:10, stirring, mixing and collecting a suspension, stirring and mixing the suspension with a zinc nitrate solution with the mass fraction of 25% according to the mass ratio of 1:1, continuing ultrasonic treatment for 30min, collecting a mixed solution, placing the mixed solution at 85 ℃ for heat preservation and drying for 12h, filtering and collecting a filter cake, washing for 5 times, then carrying out heat preservation and calcination treatment at 550 ℃ for 30min, standing, cooling to room temperature, and grinding through a 2000-mesh sieve to obtain hollow microsphere particles 3.
Preparation example 4
Adding the wetting agent 1040, the LBD-1 dispersant, the polyvinyl alcohol and the defoaming agent into deionized water according to the mass ratio of 1:1:1:1:30, and stirring and mixing to prepare the processing aid.
Example 1
Respectively weighing 25kg of pure acrylic emulsion with solid content of 35%, 15kg of aerogel particles, 6kg of kaolin, 3kg of calcium sulfate whiskers with length-diameter ratio 50, 25kg of deionized water, 10kg of hollow microsphere particles 1, 6kg of silica sol with solid content of 15% and 2kg of processing aid, adding the silica sol into the pure acrylic emulsion, stirring, mixing and ultrasonically dispersing, collecting a base fluid, stirring and mixing the processing aid, the aerogel and the deionized water at a low speed of 250r/min, placing the mixture into a dispersing device, grinding and dispersing, collecting aerogel slurry, mixing the aerogel slurry, the base fluid, the kaolin and the calcium sulfate whiskers, placing the mixture into a stirrer, stirring at a high speed of 650r/min, collecting and placing the mixture into a mixed liquid grinding device, grinding and dispersing, and passing through a 0.25 mu m screen, thus preparing the high-strength aerogel thermal insulation coating 1.
Examples 2 to 7
Examples 2 to 7: the high-strength aerogel thermal insulation coating is different from the example 1 in that the raw material proportion and the preparation parameters are shown in table 1, and the rest preparation steps and the preparation environment are the same as those in the example 1.
Table 1 table of the ingredient ratios of the raw materials of examples 1 to 7
Example 8
The high-strength aerogel thermal insulation coating is different from the coating in example 1 in that the solid content of the pure acrylic emulsion in example 8 is 40%, and the rest of the preparation steps and the preparation environment are the same as those in example 1.
Example 9
A high-strength aerogel thermal insulation coating is different from the coating in example 1 in that the adopted mesh opening size in example 9 is 0.28 microns, and the rest of the preparation steps and the preparation environment are the same as those in example 1.
Comparative example
Comparative example 1
The high-strength aerogel thermal insulation coating is different from the coating in example 1 in that calcium sulfate whiskers are not added in comparative example 1, and the rest of preparation steps and preparation environment are the same as those in example 1.
Comparative example 2
The high-strength aerogel thermal insulation coating is different from the coating in example 1 in that no silica sol is added in comparative example 2, and the rest of preparation steps and preparation environment are the same as those in example 1.
Comparative example 3
The high-strength aerogel thermal insulation coating is different from the coating in example 1 in that no hollow microsphere particles are added in comparative example 3, and the rest of preparation steps and preparation environment are the same as those in example 1.
Performance test
Respectively carrying out performance tests on the high-strength aerogel thermal insulation coatings prepared in the embodiments 1-9 and the comparative examples 1-3.
Detection method/test method
(1) The tensile strength of the coating film was measured by an electronic universal/tensile tester according to the specifications of GB/T17371-2008.
(2) The thermal conductivity of the coating film was measured by a thermal conductivity measuring instrument according to the specification of GB/T10294.
The specific detection results are shown in the following table 2:
TABLE 2 Performance test Table
Referring to the comparison of the performance tests of table 2, it can be found that:
(1) the high strength type aerogel thermal insulation coating mechanical properties and the thermal insulation performance of preparing in embodiment 1 ~ 9 all show and improve, show this application technical scheme through added the calcium sulfate whisker in the coating, owing to compound aerogel and calcium sulfate whisker, regard as reinforcing phase with the fibre, prepare out the fibre reinforcing aerogel insulation material that both had good heat-proof quality and had certain intensity, utilize the intensity and the toughness of fibre micron structure to share stress, improve the overall mechanical strength of compound aerogel, this application has adopted the calcium sulfate whisker that the draw ratio is 50 simultaneously, make the calcium sulfate whisker of load to stress homogenization, reduce the fragility of aerogel, thereby improve coating material's toughness and mechanical strength by a wide margin.
(2) Comparing embodiment 1 and comparative examples 1 to 3 in the technical scheme of the application, the components of the thermal insulation coating are adjusted in the comparative examples 1 to 3, so that the performance of the thermal insulation coating is remarkably reduced, and the technical scheme of the application is shown that the hollow microsphere particles are arranged in the aerogel thermal insulation coating, and have good thermal insulation effect on one hand, so that the thermal insulation performance of the aerogel coating can be effectively improved, and on the other hand, the hollow microsphere particles can be effectively filled into the coating and uniformly dispersed in the pore structure of the aerogel material and serve as structural anchoring points between the aerogel material and the coating base layer, so that in the actual use process, the mechanical property of the coating surface is improved, and the toughness and the mechanical strength of the coating material can be greatly improved;
meanwhile, the silica sol is added into the coating and the solid content of the coating is limited, through effective addition of the silica sol, when the silica sol loses moisture, monomer silicic acid is gradually polymerized into high polymer silica gel, colloid molecules are increased along with evaporation of the moisture, and finally a-SiO-O-SiO-inorganic polymer coating is formed.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. The high-strength aerogel thermal insulation coating is characterized by comprising the following components in parts by weight:
25-30 parts of pure acrylic emulsion;
15-20 parts of aerogel particles;
6-8 parts of kaolin;
3-5 parts of calcium sulfate whiskers;
25-30 parts of deionized water;
2-5 parts of a processing aid; the length-diameter ratio of the calcium sulfate whisker is 50-60.
2. The high-strength aerogel thermal insulation coating as claimed in claim 1, further comprising 10-15 parts by weight of hollow microsphere particles.
3. The high-strength aerogel thermal insulation coating as claimed in claim 2, wherein the hollow microsphere particle material is prepared by the following scheme:
(1) adding carbon microspheres into an ethanol solution with the mass fraction of 35% according to the mass ratio of 1: 8-10, stirring, mixing and collecting a suspension, stirring and mixing the suspension and a zinc nitrate solution with the mass fraction of 25% according to the mass ratio of 1:1, continuing ultrasonic treatment, and collecting a mixed solution;
(2) and (3) keeping the temperature of the mixed solution and drying, filtering and collecting a filter cake, washing, keeping the temperature and calcining, standing and cooling to room temperature, and grinding and sieving with a 2000-mesh sieve to obtain the hollow microsphere particles.
4. The high-strength aerogel thermal insulation coating as claimed in claim 2, wherein the temperature of the thermal insulation calcination treatment in step (2) is 450-550 ℃.
5. The high-strength aerogel thermal insulation coating as claimed in claim 1, further comprising 6-8 parts of silica sol with a solid content of 15%.
6. A high-strength aerogel thermal insulation coating as claimed in claim 1, wherein the pure acrylic emulsion has a solid content of 35-40%.
7. The preparation method of the high-strength aerogel thermal insulation coating according to any one of claims 1 to 6, wherein the preparation step of the high-strength aerogel thermal insulation coating comprises the following steps:
s1, preparing a base liquid: adding silica sol into the pure acrylic emulsion according to the formula, stirring, mixing, performing ultrasonic dispersion, and collecting to obtain a base fluid;
s2, preparing aerogel slurry: stirring and mixing the processing aid, aerogel and deionized water at a low speed according to a formula, placing the mixture into a dispersing device, grinding and dispersing the mixture, and collecting aerogel slurry;
s3, preparing a heat-insulating coating: mixing the aerogel slurry, the base fluid, the kaolin and the calcium sulfate whiskers according to a formula, placing the mixture in a stirrer for high-speed stirring, collecting the stirred mixed solution, placing the mixed solution in a grinding device, grinding and dispersing the mixed solution, and screening the ground mixed solution through a screen to obtain the high-strength aerogel thermal insulation coating.
8. The preparation method of the high-strength aerogel thermal insulation coating according to claim 7, wherein the low-speed stirring speed in step S2 is 250-300 r/min.
9. The preparation method of the high-strength aerogel thermal insulation coating according to claim 7, wherein the high-speed stirring speed in step S3 is 650-800 r/min.
10. The preparation method of the high-strength aerogel thermal insulation coating according to claim 7, wherein the mesh size of the screen in step S3 is 0.25-0.28 μm.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113181430A (en) * | 2021-04-12 | 2021-07-30 | 北京冬曦既驾科技咨询有限公司 | Medical ceramic slurry for additive manufacturing and medical article prepared from medical ceramic slurry |
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