CN113698866A - Wave-absorbing coating for building and preparation method thereof - Google Patents
Wave-absorbing coating for building and preparation method thereof Download PDFInfo
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- CN113698866A CN113698866A CN202111213679.9A CN202111213679A CN113698866A CN 113698866 A CN113698866 A CN 113698866A CN 202111213679 A CN202111213679 A CN 202111213679A CN 113698866 A CN113698866 A CN 113698866A
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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
- C09D179/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen, with or without oxygen, or carbon only, not provided for in groups C09D161/00 - C09D177/00
- C09D179/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
- C09D179/08—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
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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
- C09D131/00—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 an acyloxy radical of a saturated carboxylic acid, of carbonic acid, or of a haloformic acid; Coating compositions based on derivatives of such polymers
- C09D131/02—Homopolymers or copolymers of esters of monocarboxylic acids
- C09D131/04—Homopolymers or copolymers of vinyl acetate
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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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/32—Radiation-absorbing paints
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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
- C09D7/20—Diluents or solvents
Abstract
The invention relates to a wave-absorbing coating for buildings and a preparation method thereof, wherein the coating comprises the following raw materials in parts by weight: 30-40 parts of organic solvent, 20-30 parts of deionized water, 30-40 parts of wave absorbing agent, 1-5 parts of glycerol, 1-5 parts of adhesive, 0-1 part of silica fume, and methyl acrylate and/or butyl acrylate as organic solvent, wherein when the methyl acrylate and/or the butyl acrylate are mixed, the mixing ratio is (2.5-1): (1:2). During preparation, weighing an organic solvent, adding a binder and part of deionized water into the organic solvent, uniformly stirring, and standing to obtain a primary mixed solution; weighing the wave absorbing agent, and uniformly dispersing the wave absorbing agent in the primary mixed liquid to obtain a uniform liquid; and adding glycerol, silica fume and the other part of deionized water into the uniform liquid, uniformly stirring to obtain wave-absorbing slurry, then smearing the wave-absorbing slurry on a backboard material, and maintaining to obtain the wave-absorbing coating. The invention is based on preparing organic solvent as base, and uses iron series wave-absorbing material and ceramic wave-absorbing material, which are matched with each other by different proportion, to reach corresponding wave-absorbing effect.
Description
The technical field is as follows:
the invention belongs to the technical field of wave-absorbing material preparation, and particularly relates to a wave-absorbing coating for a building and a preparation method thereof.
Background art:
the wave-absorbing material is a material capable of absorbing or greatly reducing electromagnetic wave energy received by the surface of the wave-absorbing material, thereby reducing interference of the electromagnetic wave. In engineering application, the wave-absorbing material is required to have high absorption rate to electromagnetic waves in a wider frequency band, and also required to have the properties of light weight, temperature resistance, moisture resistance, corrosion resistance and the like.
With the development of modern science and technology, the influence of electromagnetic wave radiation on the environment is increasing day by day. The airplane and airplane flight are mistakenly started because the airplane and airplane flight cannot take off due to electromagnetic wave interference; in hospitals and mobile phones, the normal operation of various electronic medical instruments is often interfered. Therefore, the wave-absorbing material, which is a material capable of resisting and weakening electromagnetic wave radiation, is a major subject of material science to be found for treating electromagnetic pollution. Electromagnetic radiation causes direct and indirect damage to the human body through thermal, non-thermal, cumulative effects. Researches prove that the ferrite wave-absorbing material has the best performance, and has the characteristics of high absorption frequency band, high absorptivity, thin matching thickness and the like. The material can be applied to electronic equipment to absorb leaked electromagnetic radiation and achieve the aim of eliminating electromagnetic interference. According to the propagation rule of electromagnetic waves in a medium from a low magnetic guide direction to a high magnetic guide direction, the ferrite with high magnetic conductivity is used for guiding the electromagnetic waves, a large amount of radiation energy of the electromagnetic waves is absorbed through resonance, and then the energy of the electromagnetic waves is converted into heat energy through coupling.
At present, the development and deep research of the corresponding internet technology are increasingly serious, the corresponding electromagnetic pollution problem needs to be solved urgently, the corresponding wave-absorbing material is required to be implemented in every family, and the wave-absorbing material can meet the requirements of the optical people only by absorbing the wave with a coating type outer wall body of a building material.
The invention content is as follows:
the invention aims to overcome the practical factor that the wave-absorbing material in the prior art can not be applied in large scale, and provides a wave-absorbing coating for buildings and a preparation method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
a wave-absorbing coating for buildings comprises the following raw materials in parts by weight: 30-40 parts of organic solvent, 20-30 parts of deionized water, 30-40 parts of wave absorbing agent, 1-5 parts of glycerol, 1-5 parts of binder and 0-1 part of silica fume, wherein:
the organic solvent is methyl acrylate and/or butyl acrylate, and when the methyl acrylate and the butyl acrylate are mixed, the mixing mass ratio is methyl acrylate: butyl acrylate ═ (2.5-1): (1:2).
The organic solvent comprises the following components in percentage by mass: the wave-absorbing material is (3-4) to (3-4).
The wave absorbing agent is silicon carbide and/or nickel zinc ferrite, and when the silicon carbide and the nickel zinc ferrite are mixed, the mixing ratio is (1-2): 1, the diameter of the wave absorbing agent particles is 10-50 μm.
The nickel zinc ferrite is spinel type.
The adhesive is polyimide and/or vinyl acetate, and when the two are mixed, the mixing ratio is any ratio.
The glycerol is a glycerol solution.
The silica fume is an industrial grade raw material, and the granularity is 10-50 mu m.
The wave-absorbing coating for the building is detected to be less than-7 dB in full frequency band within the range of 11.9GHz-18GHz, and meets the wave-absorbing standard of daily life, wherein the minimum reflectivity appears at 16.45-16.75GHz, and the reflectivity peak value reaches-46.5 to-37.5 dB.
The preparation method of the wave-absorbing coating for the building comprises the following steps:
step 1, preparing wave-absorbing slurry:
(1) organic solvent pre-configuration:
weighing an organic solvent according to a mass ratio, putting the organic solvent into a mixer, dividing 20-30 parts of deionized water into two parts with equal mass, marking as deionized water A and deionized water B, adding a binder and the deionized water A into the organic solvent, uniformly mixing, uniformly stirring, and standing to obtain a primary mixed solution;
(2) weighing the wave absorbing agent, and uniformly dispersing the wave absorbing agent in the primary mixed liquid to obtain a uniform liquid;
(3) adding glycerol, silica fume and deionized water B into the uniform solution, and uniformly stirring to obtain wave-absorbing slurry;
and (4) coating the wave-absorbing slurry on a back plate material, and maintaining to obtain the wave-absorbing coating.
In the step (1), the stirring time is 1-3 min, and the standing time is 1-3 min.
In the step (2), the wave absorbing agent is uniformly dispersed in the primary mixed liquid by adopting an ultrasonic wave dispersion medium instrument.
In the step (3), the stirring time is 1-3 min.
In the step (4), the back plate material is a magnesium oxysulfate cement sample.
In the step (4), the curing humidity is 50% +/-5%, the curing temperature is 15-25 ℃, and the curing time is 20-24 h.
The invention has the beneficial effects that:
the coating used for the wave-absorbing layer of the building material has simple preparation process, utilizes the rule that electromagnetic waves propagate in a medium from a low magnetic guide direction to a high magnetic guide direction, utilizes the ferrite with high magnetic conductivity to guide the electromagnetic waves, absorbs a large amount of radiation energy of the electromagnetic waves through resonance, and converts the energy of the electromagnetic waves into heat energy through coupling. And ceramic wave-absorbing material micron-sized silicon carbide is used as an auxiliary material, the wave-absorbing slurry is prepared on the basis of taking an organic solvent as a carrier, and the electromagnetic pollution can be greatly reduced by a corresponding coating.
2, the organic solvent, the wave absorbing agent, the binder and the modifier are added according to a certain mixing proportion, so that the excellent wave absorbing performance is integrally exerted, the production structure is optimized, and the production cost is reduced.
3 the organic solvent can uniformly disperse the wave absorbing agent and is used as a pulping carrier. The modified microwave absorbing agent is generally used for adjusting the viscosity and the stability of slurry and improving the fluidity of the slurry so as to fully disperse and infiltrate the wave absorbing particles in an organic polymer system, so that the wave absorbing agent has proper initial viscosity at the initial storage stage, multi-component and multi-phase components in the slurry can be ensured to be stably and uniformly suspended and dispersed in the system, the sedimentation or agglomeration phenomenon does not occur after long-time storage, the dispersed wave absorbing agent permeates into an organic solvent so that the overall environment is more uniform, and the modified microwave absorbing agent and the organic solvent have higher solubility in the modified microwave absorbing agent based on similar affinity and similar chemical composition of the organic solvent so that the overall viscosity and fluidity reach a dynamic balance state.
Description of the drawings:
FIG. 1 is a diffraction pattern of a nickel zinc ferrite used in an embodiment of the present invention;
FIG. 2 is a schematic view of the internal dissolution of an organic solvent used in the example of the present invention.
The specific implementation mode is as follows:
the present invention is further described in detail with reference to the following specific examples, but the scope of the present invention is not limited by the specific examples, which are defined by the claims. In addition, any modification or change that can be easily made by a person having ordinary skill in the art without departing from the technical solution of the present invention will fall within the scope of the claims of the present invention.
The following examples and comparative examples: the adopted nickel-zinc ferrite has a spinel structure, the diffraction pattern of the nickel-zinc ferrite is shown in figure 1, corresponding characteristic peaks appear at 18.40 degrees, 30.22 degrees, 35.58 degrees, 43.24 degrees, 57.14 degrees and 62.72 degrees of 2 theta, the characteristic peaks respectively correspond to (111), (220), (331), (400), (511) and (440) planes, and no other miscellaneous peaks appear in the pattern.
In examples 1 to 6, the schematic diagrams of the internal dissolution of organic solvents are shown in fig. 2, and the idealized model shows the existence of the overall order and is well-defined for the overall arrangement of the ordered dislocation.
The coated back plate material is a magnesium oxysulfate cement sample which comprises 50% of magnesium oxide, 25% of water and 25% of magnesium sulfate in percentage by mass.
Example 1
The wave-absorbing coating for the building is prepared from the following components in parts by weight:
25 parts of methyl acrylate, 10 parts of butyl acrylate, 25 parts of deionized water, 35 parts of a wave absorbing agent, 3 parts of glycerol, 1.5 parts of a binder and 0.5 part of silica fume. The wave-absorbing material matrix comprises 17.5 parts of ferrite powder and 17.5 parts of silicon carbide.
The diameter of the wave absorbing agent particles is 10-50 μm.
The binder is polyimide.
The glycerol is a glycerol solution.
The silica fume is an industrial grade raw material, and the granularity is 10-50 mu m.
The preparation method of the wave-absorbing coating for the building comprises the following specific operation steps:
(1) pre-configuring an organic solvent, weighing the organic solvent with the corresponding formula amount, putting the organic solvent into a mixer, quickly adding a certain amount of binder and 12.5 parts of water into the mixer, uniformly mixing, stirring for 3 minutes, and standing for 3 minutes.
(2) And (2) premixing wave-absorbing base materials, weighing a mixed wave-absorbing material base body with a corresponding formula amount, putting the mixed wave-absorbing material base body into the solution after treatment in the step (1), and uniformly dispersing the wave-absorbing material in the solution by an ultrasonic wave dispersion medium instrument.
(3) Adding glycerol and silica fume into the solution in the step (2) according to the proportion in the corresponding formula, adding 12.5 parts of water into a mixer quickly, and uniformly mixing for 3 minutes to prepare mixed slurry;
(4) and (4) coating preparation, namely coating the mixed slurry on a back plate material. And then placing the mould under the conditions that the humidity is 50% +/-5% and the temperature is 20 ℃ for curing for 24 hours to obtain the wave-absorbing coating.
The prepared wave-absorbing coating is on 11.9GHz-18GHz, the full frequency band is less than-7 dB, the wave-absorbing standard of daily life is met, the minimum reflectivity is 16.3GHz, and the reflectivity can reach-46.1 dB.
Comparative examples 1 to 1
The difference is that the same acrylonitrile is replaced by methyl acrylate, the same vinyl chloride is replaced by butyl acrylate, the same process as the example 1 is adopted to prepare the wave-absorbing material, and the performance test shows that the reflection frequency band is 16-18GHz and the reflectivity peak value is-13.3 dB. Microscopic monitoring shows that the wave-absorbing particles cannot be fully dispersed and infiltrated in an organic polymer system, and multiphase components cannot be stably and uniformly suspended and dispersed in the system, so that the phenomenon of sedimentation or agglomeration occurs, and the wave-absorbing performance is obviously reduced.
Comparative examples 1 to 2
The difference from the example 1 is that the ratio of methyl acrylate to butyl acrylate is 1:3, specifically, 9 parts by weight of methyl acrylate and 27 parts by weight of butyl acrylate, the same process as that of the example 1 is adopted to prepare the wave-absorbing material, and the peak value of the reflectivity is-26.1 dB within the reflection frequency band of 11.9-18GHz through performance test. The analysis reason is that the proportion of butyl acrylate in the organic solvent is too much, and the rigidity of methyl acrylate is higher than that of butyl acrylate, so that the moderate matching of rigidity and toughness is required to be ensured on the premise that the copolymer has better mechanical properties, and the blending of the rigidity and the toughness is extremely difficult. Excessive butyl acrylate is added, so that the formability of the whole organic solvent is obviously poor, the whole wave absorbing agent cannot be uniformly dispersed, and the wave absorbing performance is further reduced.
Comparative examples 1 to 3
The difference from the example 1 is that the adding amount ratio of the organic solvent to the wave absorbing agent is 2:1, and in the specific organic solvent, 33.34 parts of methyl acrylate and 13.33 parts of butyl acrylate are added; 23.33 parts of wave absorbing agent, wherein 11.665 parts of nickel zinc ferrite and 11.665 parts of silicon carbide. The wave-absorbing material is prepared by the same process as the example 1, and the peak value of the reflectivity of the wave-absorbing material is-16.3 dB in a 13-15GHz reflection frequency band through performance tests. According to the analysis of the system state and theory, the improper proportioning of the organic solvent and the wave-absorbing material causes the narrowing of the whole wave-absorbing frequency band, the reflectivity is greatly reduced, and the wave-absorbing effect of the prepared sample is obviously reduced.
Example 2
A wave-absorbing coating for buildings is prepared from the following components in parts by weight:
20 parts of methyl acrylate, 15 parts of butyl acrylate, 25 parts of deionized water, 35 parts of a wave absorbing agent, 2 parts of glycerol, 2.5 parts of a binder and 0.5 part of silica fume. The wave-absorbing material matrix comprises 21 parts of ferrite powder and 14 parts of silicon carbide.
The diameter of the wave absorbing agent particles is 10-20 μm.
The binder is vinyl acetate.
The glycerol is a glycerol solution.
The silica fume is an industrial grade raw material, and the granularity is 10-30 mu m.
The preparation method of the wave-absorbing coating for the building comprises the following specific operation steps:
(1) pre-configuring an organic solvent, weighing the organic solvent with the amount corresponding to the formula, putting the organic solvent into a mixer, quickly adding the binder with the corresponding amount and 12.5 parts of water into the mixer, uniformly mixing, stirring for 2 minutes, and standing for 2 minutes.
(2) And (2) premixing wave-absorbing base materials, weighing a mixed wave-absorbing material base body with a corresponding formula amount, putting the mixed wave-absorbing material base body into the solution after treatment in the step (1), and uniformly dispersing the wave-absorbing material in the solution by an ultrasonic wave dispersion medium instrument.
(3) Adding glycerol and silica fume into the solution in the step (2) according to the proportion in the corresponding formula, adding 12.5 parts of water into a mixer quickly, uniformly mixing, and stirring for 1-3 minutes to prepare mixed slurry;
(4) and (4) coating preparation, namely coating the mixed slurry on a back plate material. And then placing the mould under the conditions that the humidity is 50% +/-5% and the temperature is 20 ℃ for curing for 24 hours to obtain the wave-absorbing coating.
The prepared wave-absorbing coating is on 11.9GHz-18GHz, the full frequency band is less than-7 dB, the wave-absorbing standard of daily life is met, the minimum reflectivity is 16.8GHz, and the reflectivity can reach-45.3 dB.
Examples 3 to 6
The wave-absorbing coating for the building is the same as the coating in example 1, except that the wave-absorbing material raw materials are different and are specifically shown in the following table 1.
The wave-absorbing coating for the building is prepared by adopting the same process as the embodiment 1. Through detection, the prepared wave-absorbing coating is on 11.9GHz-18GHz, the full frequency band is less than-7 dB, and the wave-absorbing standard of daily life is met, wherein the minimum reflectivity of the embodiment 3 is 16.7GHz, the minimum reflectivity of the embodiment 4 is 16.5GHz, the minimum reflectivity of the embodiment 5 is 16.72GHz, and the minimum reflectivity of the embodiment 6 is 16.45 GHz; the reflectivity peak data of the wave-absorbing material of each embodiment is shown in table 1.
TABLE 1
In the above table, methyl acrylate, butyl acrylate, wave absorbing agent, nickel-zinc ferrite, and reflectivity peak unit is dB.
Claims (10)
1. The wave-absorbing coating for the building is characterized by comprising the following raw materials in parts by weight: 30-40 parts of organic solvent, 20-30 parts of deionized water, 30-40 parts of wave absorbing agent, 1-5 parts of glycerol, 1-5 parts of binder and 0-1 part of silica fume, wherein:
the organic solvent is methyl acrylate and/or butyl acrylate, and when the methyl acrylate and the butyl acrylate are mixed, the mixing mass ratio is methyl acrylate: butyl acrylate ═ (2.5-1): (1:2).
2. The wave-absorbing coating for buildings according to claim 1, wherein the weight ratio of the organic solvent: the wave-absorbing material is (3-4) to (3-4).
3. The wave-absorbing coating for buildings according to claim 1, wherein the wave-absorbing agent is silicon carbide and/or nickel zinc ferrite, and when the two are mixed, the mixing ratio is (1-2): 1, the diameter of the wave absorbing agent particles is 10-50 μm.
4. The architectural wave absorbing coating of claim 1, wherein said nickel zinc ferrite is of spinel type.
5. The wave-absorbing coating for buildings according to claim 1, characterized in that the binder is polyimide and/or vinyl acetate, and when the two are mixed, the mixing ratio is any ratio.
6. The wave-absorbing coating for buildings according to claim 1, wherein the glycerol is glycerol solution, the silica fume is industrial grade raw material, and the granularity is 10-50 μm.
7. The architectural wave-absorbing coating according to claim 1, wherein the architectural wave-absorbing coating is detected to have a full band < -7dB in a range of 11.9GHz-18GHz, wherein the minimum reflectivity occurs in a range of 16.45-16.75GHz, and the reflectivity peak reaches-46.5 to-37.5 dB.
8. The preparation method of the wave-absorbing coating for buildings of claim 1 is characterized by comprising the following steps:
step 1, preparing wave-absorbing slurry:
(1) organic solvent pre-configuration:
weighing an organic solvent according to a mass ratio, dividing 20-30 parts of deionized water into two parts with equal mass, marking as deionized water A and deionized water B, adding a binder and the deionized water A into the organic solvent, stirring uniformly, and standing to obtain a primary mixed solution;
(2) weighing the wave absorbing agent, and uniformly dispersing the wave absorbing agent in the primary mixed liquid to obtain a uniform liquid;
(3) adding glycerol, silica fume and deionized water B into the uniform solution, and uniformly stirring to obtain wave-absorbing slurry;
step 2, preparing the wave-absorbing coating:
and (4) coating the wave-absorbing slurry on a back plate material, and maintaining to obtain the wave-absorbing coating.
9. The method for preparing the wave-absorbing coating for buildings according to claim 8, wherein in the step (4), the back plate material is a magnesium oxysulfate cement sample.
10. The method for preparing the wave-absorbing coating for the building of claim 8, wherein in the step (4), the curing humidity is 50% ± 5%, the curing temperature is 15-25 ℃, and the curing time is 20-24 h.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117547349A (en) * | 2024-01-10 | 2024-02-13 | 中国科学技术大学 | Laser interstitial thermotherapy device |
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