CN115926552A - Heat-insulation shielding coating, preparation process thereof and electronic product - Google Patents
Heat-insulation shielding coating, preparation process thereof and electronic product Download PDFInfo
- Publication number
- CN115926552A CN115926552A CN202211536357.2A CN202211536357A CN115926552A CN 115926552 A CN115926552 A CN 115926552A CN 202211536357 A CN202211536357 A CN 202211536357A CN 115926552 A CN115926552 A CN 115926552A
- Authority
- CN
- China
- Prior art keywords
- heat
- shielding coating
- agent
- insulating
- binder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The application relates to the technical field of preparation of heat-insulating shielding coatings, and particularly discloses a heat-insulating shielding coating, a preparation process thereof and an electronic product. The heat-insulating shielding coating is mainly prepared from the following raw materials: the composite material comprises silica aerogel, a heat insulating agent, a wave absorbing agent, a binder, a defoaming agent, polyurethane resin, a curing agent, a surfactant, a solvent and shale ceramsite; the preparation process comprises the following steps: mixing a solvent, silicon dioxide aerogel, a heat insulating agent and 1/3-1/2 of a binder to obtain a mixture A; mixing the wave absorbing agent, the surfactant and the rest of the binder to obtain a mixture B; if silver-coated copper powder needs to be added, adding the silver-coated copper powder in the current step; and uniformly mixing and stirring the polyurethane resin, the shale ceramsite, the curing agent, the defoaming agent, the mixture A and the mixture B to obtain the heat-insulating shielding coating. The heat-insulating shielding coating prepared by the method has better electromagnetic shielding performance on electromagnetic waves.
Description
Technical Field
The application relates to the technical field of preparation of heat-insulating shielding coatings, in particular to a heat-insulating shielding coating, a preparation process thereof and an electronic product.
Background
With the development of scientific technology and electronic industry, the wide application of various communication and electronic equipment and the like causes serious electromagnetic pollution, so that the problems of electromagnetic wave interference and information leakage are increasingly prominent.
Now, the importance of electromagnetic shielding is deeply recognized in many countries, and the development and application of electromagnetic shielding materials become more important and urgent. Among various electromagnetic shielding materials, the electromagnetic shielding coating is widely applied due to low cost, simplicity, practicability and wide application range.
In the prior art, a housing of an electronic product is a plastic housing, and in order to perform electromagnetic shielding treatment, a conductive filler is generally mixed with resin to prepare a conductive plastic when the plastic housing is molded.
The conductivity of the conductive plastic is related to the type and the property of the conductive filler, but the addition of the conductive filler seriously affects the processability of the plastic, thereby affecting the shielding effect of the conductive plastic shell.
Disclosure of Invention
In order to improve the electromagnetic shielding performance of electronic products, the application provides a heat-insulating shielding coating, a preparation process thereof and an electronic product.
In a first aspect, the present application provides a thermal insulation shielding coating, which adopts the following technical scheme:
a heat-insulation shielding coating is mainly prepared from the following raw materials in parts by weight: 10-15 parts of silicon dioxide aerogel, 3-5 parts of a heat insulating agent, 3-5 parts of a wave absorbing agent, 15-20 parts of a binder, 1-2 parts of a defoaming agent, 5-10 parts of polyurethane resin, 0.5-1 part of a curing agent, 1-2 parts of a surfactant, 10-20 parts of a solvent and 1-2 parts of shale ceramsite, wherein the heat insulating agent is composed of ceramic fibers, calcium silicate and lithium carbonate according to the mass ratio of (5-8) to (2-3) to (1-2), and the wave absorbing agent is at least two of nano hollow glass microspheres, polyaniline/ferroferric oxide compound and barium titanate/silicon carbide composite material.
Preferably, the solvent is ethanol.
Preferably, the defoamer is tributyl phosphate.
Preferably, the curing agent is an HDI curing agent.
Preferably, the surfactant is sodium dodecyl benzene sulfonate.
By adopting the technical scheme, the heat insulating agent and the wave absorbing agent are added into the heat insulating shielding coating, the heat insulating agent and the wave absorbing agent are matched with each other, so that a heat insulating layer and a wave absorbing layer are conveniently formed, the wave absorbing agent absorbs electromagnetic waves, and the shielding property of the heat insulating shielding coating is improved; polyaniline in the wave absorbing agent is a polymer material which is formed by chemically or electrochemically doping polymers with conjugated pi bonds to enable the polymers to be converted into conductors from insulators, the ferroferric oxide has small particle size and specific physical and chemical properties such as size effect and quantum effect, and a conductive polymer formed by the polyaniline and the ferroferric oxide can realize the combination of electric and magnetic properties, and can realize the adjustment of the electric and magnetic properties of the composite material by adjusting the composition and the structure of each component, thereby being convenient for improving the absorption of electromagnetic waves; the silicon carbide in the wave absorbing agent belongs to a resistance type wave absorbing material, electromagnetic energy is mainly attenuated on the resistance of the material, and the barium titanate/silicon carbide composite material and the barium titanate belong to a dielectric medium type wave absorbing material so as to further improve the electromagnetic wave shielding performance of the heat-insulating shielding coating.
Preferably, the mass ratio of the silicon dioxide aerogel to the heat insulating agent to the wave absorbing agent is (12-14) to (3-4) to (4-5).
Through adopting above-mentioned technical scheme, adjust the ratio of three kinds of components of silica aerogel, heat insulating agent, wave absorbent to make the ratio of three kinds of components reach the best, thereby further improve the stability of insulating layer, the ripples layer that thermal-insulated shielding coating formed, thereby improve the absorption to the electromagnetic wave, and then reduce thermal production, simultaneously, the heat that the electromagnetic wave that does not shield produced blocks through the insulating layer, thereby further reduces thermal influence.
Preferably, the particle size grading of the calcium silicate is 20-25% by mass of 5-8um, 30-35% by mass of 8-15um, 25-30% by mass of 15-20um and 15-20% by mass of 20-25 um.
By adopting the technical scheme, the calcium silicate with different grain diameters is adopted, so that on one hand, the compactness of the heat insulation layer is improved, the transmission path of heat is further prolonged, and the heat insulation performance of the heat insulation layer is improved; on the other hand, the small-particle-size calcium silicate and the wave absorbing agent are distributed in a staggered mode, so that the wave absorbing performance is given to the heat insulation layer, and the electromagnetic shielding performance is improved.
Preferably, the ceramic fiber is a modified ceramic fiber, and the preparation method of the modified ceramic fiber comprises the following steps: and (3) placing the ceramic fiber in the butylbenzene emulsion, uniformly stirring, then adding the graphite, uniformly mixing, taking out and drying to obtain the composite material.
Preferably, the particle size of the graphite is 20 to 30nm.
Preferably, the mass ratio of the ceramic fibers to the graphite is 3.
By adopting the technical scheme, the styrene-butadiene emulsion forms a bonding layer on the surface of the ceramic fiber, then the ceramic fiber with the bonding layer is mixed with graphite, the graphite is a carbon element crystallized mineral and has a hexagonal layered structure, good conductivity and a good shielding effect, the graphite is adhered to the outer wall of the ceramic fiber to form a stable shielding film, and further a thermal insulation layer is endowed with certain electromagnetic wave shielding property, so that the shielding property of the prepared material is further improved.
Preferably, the ceramic fibers have a diameter of 2 to 10 μm.
By adopting the technical scheme, the diameter of the ceramic fiber is larger than the particle size of the graphite, so that the contact area between the graphite and the ceramic fiber is increased, a stable wave-absorbing film is formed on the surface of the ceramic fiber, and the shielding effect of the graphite is better exerted.
Preferably, the particle size of the barium titanate/silicon carbide composite material is 15-20 μm.
By adopting the technical scheme, the barium titanate/silicon carbide composite material added in the application has moderate particle size, is convenient to improve the stability of the wave absorbing layer, and further improves the electromagnetic wave shielding performance of the heat-insulating shielding coating.
Preferably, the binder is a modified binder, and the preparation method of the modified binder comprises the following steps: mixing a binder, zirconia and steel slag to obtain a modified binder; wherein the mass ratio of the binder to the zirconia to the steel slag is (15-20) to (2-3).
By adopting the technical scheme, the binder contains the zirconium oxide and the steel slag, so that the heat transmission path is further prolonged, part of electromagnetic waves can be absorbed, the absorption efficiency of the electromagnetic waves is further improved, and the influence of the electromagnetic waves is reduced.
Preferably, the shielding coating also comprises 2-3 parts by weight of silver-coated copper powder.
Preferably, the silver-coated copper powder is dendritic.
By adopting the technical scheme, the silver conductive performance is good, but the cost is high, the copper powder conductive performance is good, but the oxidation resistance is poor, the situation of oxidation easily appears in the air, the cost is reduced by the silver-coated copper powder, the situation of oxidation appears in the copper powder is reduced, the silver-coated copper powder conductive performance is good, the dendritic silver-coated copper powder anti-settling performance is good, a communicated conductive path is conveniently formed in the heat insulation shielding coating, and the electromagnetic shielding performance of the heat insulation electromagnetic coating is further improved.
Preferably, the silica aerogel is modified silica aerogel, and the preparation method of the modified silica aerogel comprises the following steps: mixing tetraethoxysilane, ethanol and deionized water according to a molar ratio of 1. Placing the obtained alcogel/alumina fiber complex into a supercritical drier, injecting ethanol to immerse the alcogel/alumina fiber complex, cooling to 4-6 deg.C, and introducing liquid CO 2 Solvent displacement was performed to remove water and alcohol from the alcogel. When all the solvent in the alcogel is liquefied CO 2 After the replacement, the temperature in the supercritical drier is raised to 33-35 deg.C, and the pressure is increased to (7.5-8.0) × 10 6 Pa, i.e. CO 2 And (4) supercritical conditions of (1). Wherein the addition amount of the alumina fiber is 8%.
In a second aspect, the present application provides a preparation process of a thermal insulation shielding coating, which adopts the following technical scheme:
a preparation process of a heat-insulating shielding coating comprises the following steps:
(1) Preparation of the mixture A: mixing a solvent, silicon dioxide aerogel, a heat insulating agent and 1/3-1/2 of a binder to obtain a mixture A;
(2) Preparation of mixture B: mixing the wave absorbing agent, the surfactant and the rest of the binder to obtain a mixture B; if the silver-coated copper powder needs to be added, adding the silver-coated copper powder in the current step;
(3) Preparing a heat-insulating shielding coating: and (3) uniformly mixing and stirring the polyurethane resin, the shale ceramsite, the curing agent, the defoaming agent, the mixture A prepared in the step (1) and the mixture B prepared in the step (2) to obtain the heat-insulating shielding coating.
Through adopting above-mentioned technical scheme, the thermal-insulated shielding coating preparation simple process of this application, the operation of being convenient for, and allocate heat insulating agent and wave absorbing agent and add, be convenient for form insulating layer and absorbing layer in thermal-insulated shielding coating to improve thermal-insulated performance, shielding property of thermal-insulated shielding coating.
In a third aspect, the present application provides an electronic product, which adopts the following technical solutions,
an electronic product comprises a coating formed by adopting the heat-insulating shielding coating, and the heat-insulating shielding coating is coated on the surface of the electronic product and is cured.
In summary, the present application has the following beneficial effects:
1. the wave absorbing agent and the heat insulating agent are added into the heat insulating and shielding coating, and are matched with each other, so that a heat insulating layer and a wave absorbing layer are formed conveniently, and the heat insulating property and the shielding property of the heat insulating and shielding coating are improved conveniently.
2. The wave absorbing agents added into the heat-insulating shielding coating are at least two of nano hollow glass beads, polyaniline/ferroferric oxide compound and barium titanate/silicon carbide composite material, so that transmitted electromagnetic waves can be better absorbed, and the shielding efficiency of the heat-insulating shielding coating on the electromagnetic waves is improved.
Detailed Description
The present application will be described in further detail with reference to examples.
The wave absorbing agent is at least two of nano hollow glass beads, polyaniline/ferroferric oxide compound and barium titanate/silicon carbide composite material. Preferably, the wave absorbing agent consists of nano hollow glass beads, polyaniline/ferroferric oxide compound and barium titanate/silicon carbide composite material according to the mass ratio of (3-5) to (1-2). Further, the wave absorbing agent is composed of nano hollow glass beads, a polyaniline/ferroferric oxide compound and a barium titanate/silicon carbide composite material according to a mass ratio of 5.
The coating film thickness of the coating is 30-40 μm.
The silica aerogels of the present application are commercially available.
The ceramic fiber of the present application is a ceramic fiber mesh cloth.
The lithium carbonate herein has a particle size of 10 to 20 μm.
The preparation method of the polyaniline/ferroferric oxide compound comprises the following steps: and (2) putting the magnetic nanoparticles of polyaniline and ferroferric oxide into water according to the mass ratio of 3.
The particle size of the polyaniline/ferroferric oxide compound is 30-60nm.
The preparation method of the barium titanate/silicon carbide composite material comprises the following steps: and (3) placing the silicon carbide in the conductive adhesive, then adding barium titanate, and drying to obtain the conductive adhesive. Wherein the particle size of barium titanate is 10-20nm, the particle size of silicon carbide is 2-5 μm, the particle size of barium titanate/silicon carbide composite material is 15-20 μm, and the conductive adhesive is commercially available.
The zirconia herein has a particle size of 30-40nm.
The grain size of the steel slag is 10-20 mu m.
The silver-coated copper powder is dendritic and has a particle size of 5-20 μm.
The application discloses a construction process of a heat insulation shielding coating, which comprises the following steps:
(1) For plastics or metals, the surface of the workpiece should be free of plastic release agents or metal oil stains so as not to affect the combination of the coating and the workpiece. In addition, the surface roughness of the workpiece is increased, and the coating has better adhesive force on the surface of the workpiece. For the surface which is over smooth, fine sand paper can be used for roughening, and fine dust caused by sanding is removed, so that the adhesion of the coating is ensured;
(2) When in spraying, the workpiece is fixed, and the evenly stirred paint is poured into a material containing cup of the spray gun. Under a certain pressure, the air flow of the spray gun and the width of the sprayed liquid level are adjusted, the proper distance between the spray gun and the workpiece is kept, and the coating is uniformly coated on the workpiece. The air pressure can be controlled within 1.5-2.5kg/c square meter when spraying, and the distance between the spray gun nozzle and the workpiece is 20-40cm. The pressure is too high, so that sagging is easily formed, and the pressure is too low, so that the spray head is easily blocked. In the coating construction, the thickness of a coating is controlled by calculating a formula and weighing the weight of a workpiece;
(3) The workpiece construction should be dried in the shade at normal temperature, and after the moisture naturally volatilizes to the surface, the workpiece is put into an oven to be dried thoroughly, so that a firm coating can be formed.
Examples
Example 1
The heat-insulating shielding coating of the embodiment is prepared from the following raw materials in parts by weight: 10kg of silicon dioxide aerogel, 3kg of a heat insulating agent, 3kg of a wave absorbing agent, 15kg of a binder, 1kg of a defoaming agent, 1kg of a surfactant, 10kg of a solvent, 1kg of shale ceramsite, 5kg of polyurethane resin and 0.5kg of a curing agent, wherein the heat insulating agent is composed of ceramic fibers, calcium silicate and lithium carbonate according to a mass ratio of 5. The wave absorbing agent consists of nano hollow glass beads, a polyaniline/ferroferric oxide compound and a barium titanate/silicon carbide composite material according to the mass ratio of 5.
The preparation process of the heat-insulating shielding coating comprises the following steps:
(1) Preparation of the mixture A: mixing a solvent, silicon dioxide aerogel, a heat insulating agent and 1/3 of a binder to obtain a mixture A;
(2) Preparation of mixture B: mixing the wave absorbing agent, the surfactant and the rest of the binder to obtain a mixture B;
(3) Preparing a heat-insulating shielding coating: and (2) uniformly mixing and stirring the polyurethane resin, the curing agent, the defoaming agent, the shale ceramsite, the mixture A prepared in the step (1) and the mixture B prepared in the step (2) to obtain the heat-insulating shielding coating.
The electronic product of the embodiment comprises a coating formed by adopting the heat-insulating shielding coating, and the heat-insulating shielding coating is coated on the surface of the electronic product and is cured.
Examples 2 to 5
In examples 2 to 5, the heat-insulating and shielding coatings were prepared from different raw material compositions, and the raw material composition ratio of each heat-insulating and shielding coating in kg was as shown in table 1.
TABLE 1 raw material component ratios of heat insulating and shielding coatings of examples 1 to 5
| Starting materials | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 |
| Silica aerogel | 10 | 13 | 15 | 13 | 13 |
| Heat insulating agent | 3 | 3 | 5 | 4 | 4 |
| Wave absorbing agent | 3 | 4 | 5 | 4 | 5 |
| Binder | 15 | 18 | 20 | 18 | 18 |
| Defoaming agent | 1 | 1 | 2 | 1 | 1 |
| Surface active agent | 1 | 1 | 2 | 1 | 1 |
| Solvent(s) | 10 | 10 | 20 | 10 | 10 |
| Shale ceramsite | 1 | 1 | 2 | 2 | 2 |
| Polyurethane resin | 5 | 8 | 10 | 8 | 8 |
| Curing agent | 0.5 | 0.5 | 1 | 1 | 1 |
Examples 2-5 differ from example 1 in that: the raw materials have different proportions of the components, and the rest is completely the same as the example 1.
The preparation process of the thermal insulation and shielding coating of the examples 2 to 5 is exactly the same as that of the example 1.
The electronic product of embodiments 2 to 5, which includes a coating layer formed by using the above-mentioned thermal insulation shielding coating material, is coated on a surface of the electronic product, and is cured.
Example 6
The present embodiment is different from embodiment 5 in that: the calcium silicate has a grain size grading of 5-8um by mass accounting for 25%,8-15um by mass accounting for 30%,15-20um by mass accounting for 25%, and 20-25um by mass accounting for 20%. The rest is exactly the same as in example 5.
The preparation process of the thermal insulation shielding coating of the present example is exactly the same as that of example 5.
The electronic product of the embodiment comprises a coating formed by adopting the heat-insulating shielding coating, and the heat-insulating shielding coating is coated on the surface of the electronic product and is cured.
Example 7
The present embodiment is different from embodiment 6 in that: the ceramic fiber is a modified ceramic fiber, and the preparation method of the modified ceramic fiber comprises the following steps: soaking the ceramic fiber in the butylbenzene emulsion, stirring uniformly, then adding the graphite, mixing uniformly, taking out and drying to obtain the product. Wherein the particle size of the graphite is 20-30nm, and the mass ratio of the ceramic fiber to the graphite is 3. The rest was exactly the same as in example 6.
The preparation process of the thermal insulation shielding coating of the present example is exactly the same as that of example 6.
The electronic product of the embodiment comprises a coating formed by adopting the heat-insulating shielding coating, and the heat-insulating shielding coating is coated on the surface of the electronic product and is cured.
Example 8
This embodiment is different from embodiment 6 in that: the binder is a modified binder, and the preparation method of the modified binder comprises the following steps: mixing a binder, zirconia and steel slag to obtain a modified binder; wherein the mass ratio of the binder to the zirconia to the steel slag is 15. The rest was exactly the same as in example 6.
The preparation process of the thermal insulation shielding coating of the present example is exactly the same as that of example 6.
The electronic product of the embodiment comprises a coating formed by adopting the heat-insulating shielding coating, and the heat-insulating shielding coating is coated on the surface of the electronic product and is cured.
Example 9
The present embodiment is different from embodiment 6 in that: the preparation method of the modified silica aerogel comprises the following steps: mixing ethyl orthosilicate, ethanol and deionized water according to a molar ratio of 1. Placing the obtained alcogel/alumina fiber complex into a supercritical dryer, injecting ethanol to immerse the alcogel/alumina fiber complex, cooling the temperature in the supercritical dryer to 4-6 deg.C, and introducing liquid CO 2 Solvent displacement was performed to remove water and alcohol from the alcogel. When all the solvent in the alcogel is liquefied CO 2 After the replacement, the temperature in the supercritical drier was raised to 35 ℃ and the pressure was increased to 7.5X 10 6 Pa, i.e. to CO 2 And (4) supercritical conditions of (1). Wherein the addition amount of the alumina fiber is 8%. The rest is exactly the same as in example 6.
The preparation process of the thermal insulation shielding coating of the present example is exactly the same as that of example 6.
The electronic product of the embodiment comprises a coating formed by adopting the heat-insulating shielding coating, and the heat-insulating shielding coating is coated on the surface of the electronic product and is cured.
Example 10
The heat-insulating shielding coating of the embodiment is prepared from the following raw materials in parts by weight: 10kg of silicon dioxide aerogel, 3kg of heat insulating agent, 3kg of wave absorbing agent, 15kg of binder, 1kg of defoaming agent, 1kg of surfactant, 10kg of solvent, 2kg of silver-coated copper powder, 1kg of shale ceramsite, 5kg of polyurethane resin and 0.5kg of curing agent, wherein the rest parts are completely the same as those in the embodiment 1.
The preparation process of the heat-insulating shielding coating comprises the following steps:
(1) Preparation of the mixture A: mixing a solvent, silicon dioxide aerogel, a heat insulating agent and 1/3 of a binder to obtain a mixture A;
(2) Preparation of mixture B: mixing the wave absorbing agent, the surfactant, the silver-coated copper powder and the rest of the binder to obtain a mixture B;
(3) Preparing a heat-insulating shielding coating: and (3) mixing and stirring the shale ceramisite, the polyurethane resin, the curing agent, the defoaming agent, the mixture A prepared in the step (1) and the mixture B prepared in the step (2) uniformly to obtain the heat-insulating shielding coating.
The electronic product of the embodiment comprises a coating formed by adopting the heat-insulating shielding coating, and the heat-insulating shielding coating is coated on the surface of the electronic product and is cured.
Comparative example
Comparative example 1
The heat-insulating shielding coating of the comparative example is prepared from the following raw materials in parts by weight: 10kg of silica aerogel, 3kg of heat insulating agent, 15kg of binder, 1kg of defoaming agent, 1kg of surfactant, 10kg of solvent, 1kg of shale ceramsite, 5kg of polyurethane resin and 0.5kg of curing agent, and the rest is completely the same as that of the embodiment 1.
The preparation process of the thermal insulation shielding coating of the comparative example comprises the following steps:
(1) Preparation of the mixture A: mixing a solvent, silicon dioxide aerogel, a heat insulating agent and 1/3 of a binder to obtain a mixture A;
(3) Preparing a heat-insulating shielding coating: and (2) uniformly mixing and stirring the polyurethane resin, the curing agent, the defoaming agent, the shale ceramisite, the surfactant, the residual binder, the mixture A prepared in the step (1) and the mixture B prepared in the step (2) to obtain the heat-insulating shielding coating.
The electronic product of the comparative example comprises a coating formed by adopting the heat-insulating shielding coating, and the heat-insulating shielding coating is coated on the surface of the electronic product and is cured.
Comparative example 2
The heat-insulating shielding coating of the comparative example was prepared from the following raw materials by weight: 10kg of silicon dioxide aerogel, 3kg of wave absorbing agent, 15kg of binder, 1kg of defoaming agent, 1kg of surfactant, 10kg of solvent, 2kg of shale ceramsite, 5kg of polyurethane resin and 0.5kg of curing agent, and the rest is completely the same as that of the embodiment 1.
The preparation process of the thermal insulation shielding coating of the comparative example comprises the following steps: (1) mixture preparation A: mixing a solvent, silicon dioxide aerogel and 1/3 of a binder to obtain a mixture A;
(2) Preparation of mixture B: mixing the wave absorbing agent, the surfactant and the rest of the binder to obtain a mixture B;
(3) Preparing a heat-insulating shielding coating: and (2) uniformly mixing and stirring the polyurethane resin, the curing agent, the defoaming agent, the shale ceramsite, the mixture A prepared in the step (1) and the mixture B prepared in the step (2) to obtain the heat-insulating shielding coating.
The electronic product of the comparative example comprises a coating formed by adopting the heat-insulating shielding coating, and the heat-insulating shielding coating is coated on the surface of the electronic product and is cured.
Comparative example 3
The heat-insulating shielding coating of the comparative example was prepared from the following raw materials by weight: 10kg of silica aerogel, 3kg of heat insulating agent, 3kg of wave absorbing agent, 15kg of binder, 1kg of defoaming agent, 1kg of surfactant, 10kg of solvent, 2kg of shale ceramsite, 5kg of polyurethane resin and 0.5kg of curing agent, and the rest is completely the same as that of the embodiment 1.
The preparation process of the thermal insulation shielding coating of the comparative example comprises the following steps: mixing and stirring uniformly silica aerogel, a heat insulating agent, a wave absorbing agent, a binder, a defoaming agent, a surfactant, a solvent, polyurethane resin, a curing agent and shale ceramsite to obtain the composite material.
The electronic product of the comparative example comprises a coating formed by adopting the heat-insulating shielding coating, and the heat-insulating shielding coating is coated on the surface of the electronic product and is cured.
Detection method
And (3) detecting the heat insulation performance: the thermal conductivity of the thermal insulation shielding coatings prepared in examples 1 to 10 and comparative examples 1 to 3 was measured by a Hot TPS 2500S thermal conductivity meter, and the results are shown in table 2.
And (3) electromagnetic shielding effectiveness detection: the electromagnetic shielding properties of the heat-insulating and shielding coatings obtained in examples 1 to 10 and comparative examples 1 to 3 were measured according to the measurement method of material shielding effectiveness as SJ 20524-1995, and the measurement results are shown in Table 2.
TABLE 2 Properties of thermal insulating and shielding coatings of examples 1 to 10 and comparative examples 1 to 3
By combining the example 1 and the comparative examples 1 to 3 and combining the table 2, it can be seen that the electromagnetic shielding effectiveness of the thermal insulation shielding coating prepared in the example 1 is greater than that of the thermal insulation shielding coatings prepared in the comparative examples 1 to 3, the thermal conductivity of the thermal insulation shielding coating prepared in the example 1 is less than that of the thermal insulation shielding coatings prepared in the comparative examples 1 to 3, compared with the comparative examples 1 to 2, the coating prepared in the example 1 is coated on an electronic device by mutually matching a wave absorbing agent and a thermal insulating agent, so that a wave absorbing layer and a thermal insulating layer are conveniently formed, the thermal insulation performance and the electromagnetic shielding effectiveness of the thermal insulation shielding coating are further improved, the preparation processes of the example 1 and the comparative example 3 are different, and the performance of the thermal insulation shielding coating prepared by adopting different preparation processes is also greatly different.
By combining the embodiments 1 to 5 and table 2, it can be seen that the ratios of the components of the thermal insulation shielding coating are adjusted, the difference between the electromagnetic shielding effectiveness and the thermal conductivity measured by the thermal insulation shielding coating is large, the ratios of the three components of the silica aerogel, the thermal insulating agent and the wave absorbing agent are further adjusted, and the electromagnetic shielding effectiveness and the thermal conductivity measured by the thermal insulation shielding coating are excellent.
It can be seen from the combination of examples 5 to 6 and table 2 that the thermal conductivity and the electromagnetic shielding performance of the thermal insulation shielding coating of example 6 are superior to those of the thermal insulation shielding coating prepared in example 5, calcium silicate with different particle sizes facilitates to improve the compactness of the thermal insulation layer, and meanwhile, the thermal conductivity coefficient of calcium silicate is small, which facilitates to improve the thermal insulation performance of the thermal insulation layer, and simultaneously, the transmission path of electromagnetic waves is also prolonged, and the absorption capacity of the electromagnetic waves is further improved, thereby improving the electromagnetic shielding performance of the thermal insulation shielding coating.
Combining the example 6 and the example 7, and combining the table 2, it can be seen that the electromagnetic shielding effectiveness of the example 7 is better than the electromagnetic shielding effectiveness prepared in the example 6, and the example 7 modifies the ceramic fiber and wraps a graphite conductive layer on the outer layer of the ceramic fiber, so as to endow the heat insulating layer with a certain electromagnetic shielding effectiveness, and further improve the electromagnetic shielding effectiveness of the heat insulating and shielding coating.
By combining the embodiment 6 and the embodiment 8 and combining the table 2, it can be seen that the embodiment 8 modifies the binder, and the zirconia and the steel slag are added into the binder, so that the thermal conductivity of the zirconia is low, the thermal conductivity of the thermal insulation shielding coating is further reduced, and the steel slag contains more ferrites, which is convenient for endowing the binder with certain electromagnetic shielding performance, and further improves the thermal insulation performance and the electromagnetic shielding performance of the thermal insulation shielding coating.
It can be seen by combining examples 6 and 9 and table 2 that the thermal conductivity of the thermal insulation shielding coating of example 9 is smaller than that of the thermal insulation shielding coating of example 6, and after the silica aerogel is modified, the thermal insulation performance of the thermal insulation shielding coating is further improved.
As can be seen from the combination of the embodiment 1 and the embodiment 10 and the table 2, the electromagnetic shielding effectiveness of the embodiment 10 is greater than that of the embodiment 1, and the addition of the silver-coated copper powder facilitates the formation of the continuous conductive path in the thermal insulation shielding coating, so as to further improve the electromagnetic shielding effectiveness of the thermal insulation shielding coating.
The specific embodiments are only for explaining the present application and are not limiting to the present application, and those skilled in the art can make modifications to the embodiments without inventive contribution as required after reading the present specification, but all the embodiments are protected by patent law within the scope of the claims of the present application.
Claims (10)
1. The heat-insulation shielding coating is characterized by being mainly prepared from the following raw materials in parts by weight: 10-15 parts of silicon dioxide aerogel, 3-5 parts of a heat insulating agent, 3-5 parts of a wave absorbing agent, 15-20 parts of a binder, 1-2 parts of a defoaming agent, 5-10 parts of polyurethane resin, 0.5-1 part of a curing agent, 1-2 parts of a surfactant, 10-20 parts of a solvent and 1-2 parts of shale ceramsite, wherein the heat insulating agent comprises ceramic fibers, calcium silicate and lithium carbonate according to the mass ratio of (5-8) to (2-3) to (1-2), and the wave absorbing agent is at least two of nano hollow glass microspheres, polyaniline/ferroferric oxide composite and barium titanate/silicon carbide composite.
2. The thermal insulating and shielding coating material according to claim 1, wherein: the mass ratio of the silicon dioxide aerogel to the heat insulating agent to the wave absorbing agent is (12-14) to (3-4) to (4-5).
3. The thermal insulating and shielding coating material according to claim 1, wherein: the calcium silicate has the grain size grading of 5-8um by mass accounting for 20-25%,8-15um by mass accounting for 30-35%,15-20um by mass accounting for 25-30% and 20-25um by mass accounting for 15-20%.
4. The thermal insulating and shielding coating material according to claim 1, wherein: the ceramic fiber is a modified ceramic fiber, and the preparation method of the modified ceramic fiber comprises the following steps: and (3) placing the ceramic fiber in the butylbenzene emulsion, stirring uniformly, then adding graphite, mixing uniformly, taking out and drying to obtain the composite material.
5. The thermal insulating and shielding coating material according to claim 1, wherein: the diameter of the ceramic fiber is 2-10 μm.
6. The thermal insulating and shielding coating material according to claim 1, wherein: the particle size of the barium titanate/silicon carbide composite material is 15-20 mu m.
7. The thermal insulating and shielding coating material according to claim 1, wherein: the binder is a modified binder, and the preparation method of the modified binder comprises the following steps: mixing a binder, zirconia and steel slag to obtain a modified binder; wherein the mass ratio of the binder to the zirconia to the steel slag is (15-20) to (2-3).
8. The thermal insulating and shielding coating material according to claim 1, wherein: the shielding coating also comprises 2-3 parts by weight of silver-coated copper powder.
9. A process for preparing a thermal insulating and shielding coating according to any one of claims 1 to 8, characterized in that: comprises the following steps of (a) carrying out,
(1) Preparation of the mixture A: mixing a solvent, silicon dioxide aerogel, a heat insulating agent and 1/3-1/2 of a binder to obtain a mixture A;
(2) Preparation of mixture B: mixing the wave absorbing agent, the surfactant and the rest of the binder to obtain a mixture B; if silver-coated copper powder needs to be added, adding the silver-coated copper powder in the current step;
(3) Preparing a heat-insulating shielding coating: and (3) uniformly mixing and stirring the polyurethane resin, the shale ceramsite, the curing agent, the defoaming agent, the mixture A prepared in the step (1) and the mixture B prepared in the step (2) to obtain the heat-insulating shielding coating.
10. An electronic product, characterized in that: the coating is formed by the heat insulation shielding coating of any one of claims 1 to 8, and the heat insulation shielding coating is coated on the surface of an electronic product and is cured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211536357.2A CN115926552A (en) | 2022-12-02 | 2022-12-02 | Heat-insulation shielding coating, preparation process thereof and electronic product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211536357.2A CN115926552A (en) | 2022-12-02 | 2022-12-02 | Heat-insulation shielding coating, preparation process thereof and electronic product |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115926552A true CN115926552A (en) | 2023-04-07 |
Family
ID=86556994
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211536357.2A Pending CN115926552A (en) | 2022-12-02 | 2022-12-02 | Heat-insulation shielding coating, preparation process thereof and electronic product |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115926552A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101712837A (en) * | 2009-11-30 | 2010-05-26 | 浙江师范大学 | High-efficiency broadband wave-absorbing coating material and use method |
| CN102344648A (en) * | 2010-08-02 | 2012-02-08 | 中国科学院理化技术研究所 | Conductive polymer-magnetic material composite absorbing material |
| CN110157316A (en) * | 2019-05-29 | 2019-08-23 | 浙江康廷电子科技有限公司 | Heat-insulated suction wave material of one kind and preparation method thereof |
| CN112961592A (en) * | 2021-04-19 | 2021-06-15 | 苏州康丽达精密电子有限公司 | Functional aerogel heat-insulating coating and preparation method thereof |
-
2022
- 2022-12-02 CN CN202211536357.2A patent/CN115926552A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101712837A (en) * | 2009-11-30 | 2010-05-26 | 浙江师范大学 | High-efficiency broadband wave-absorbing coating material and use method |
| CN102344648A (en) * | 2010-08-02 | 2012-02-08 | 中国科学院理化技术研究所 | Conductive polymer-magnetic material composite absorbing material |
| CN110157316A (en) * | 2019-05-29 | 2019-08-23 | 浙江康廷电子科技有限公司 | Heat-insulated suction wave material of one kind and preparation method thereof |
| CN112961592A (en) * | 2021-04-19 | 2021-06-15 | 苏州康丽达精密电子有限公司 | Functional aerogel heat-insulating coating and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107474733B (en) | Synthesis method of polysilazane ceramic precursor resin and wave-absorbing coatings | |
| CN103880426A (en) | Broadband silicon carbide high temperature resistant wave-absorbing coating and preparation method thereof | |
| CN106752130A (en) | A kind of orientation silicon steel preparation and application of environment friendly insulating coating solution | |
| TW201815992A (en) | Electromagnetic steel sheet with insulating coating film, method for producing same, and coating agent for forming insulating coating film | |
| US11987727B2 (en) | Inorganic filler dispersion, superhydrophobic insulating and wear-resistant coating and preparation method thereof | |
| CN110922709A (en) | Conductive polymer composite wave-absorbing material and preparation method thereof | |
| CN112375454A (en) | Insulating powder coating and preparation method thereof | |
| CN111533486A (en) | Graphene modified resin packaging material and preparation method thereof | |
| CN111909600B (en) | Manufacturing method of high-thermal-conductivity resin for metal substrate | |
| CN112992442A (en) | Preparation method of mica tape with fire-resistant coating | |
| CN115926552A (en) | Heat-insulation shielding coating, preparation process thereof and electronic product | |
| CN108329801B (en) | Environment-friendly integrated waterproof coating and preparation method thereof | |
| CN111849275B (en) | Preparation method and application of water-based two-component electric heating coating | |
| CN116875103B (en) | Nano heat conduction wave absorbing auxiliary agent, low-temperature curing thermosetting powder coating and preparation method and application thereof | |
| CN105556000A (en) | Electromagnetic steel sheet with insulating coating film, method for producing same, and coating agent for forming insulating coating film | |
| CN110951382B (en) | Environment-friendly three-proofing paint and preparation method thereof | |
| CN111777923A (en) | Anti-aging epoxy resin box type transformer | |
| CN110760238A (en) | Powder coating and preparation method thereof | |
| CN114350156A (en) | High-temperature-resistant heat-conducting wave-absorbing composite material and preparation method thereof | |
| CN115011069A (en) | Halogen-free flame-retardant high-temperature-resistant low-dielectric-constant insulating structural member and preparation method thereof | |
| KR101000973B1 (en) | Electrically Conductive coating Liquid, Manufacturing Method of Electromagnetic wave absorber using the same and Electromagnetic wave absorber formed thereby | |
| CN111218207A (en) | Preparation and use method of polycarbosilane and aluminum oxide magnesium oxide compound solution | |
| KR20190124653A (en) | Method for manufacturing composite sheet for preventing heat and shielding electromagnetic interference | |
| CN111171718A (en) | Coating with good insulativity and coating process thereof | |
| CN114591670A (en) | Anti-condensation coating for high-voltage switch cabinet and preparation method and application thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |