CN112851319A - Modified ceramic heat insulation sheet, preparation method and application - Google Patents
Modified ceramic heat insulation sheet, preparation method and application Download PDFInfo
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- 239000000919 ceramic Substances 0.000 title claims abstract description 32
- 238000009413 insulation Methods 0.000 title claims abstract description 25
- 238000002360 preparation method Methods 0.000 title claims description 10
- 239000011521 glass Substances 0.000 claims abstract description 38
- 239000000843 powder Substances 0.000 claims abstract description 37
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 34
- 239000006229 carbon black Substances 0.000 claims abstract description 34
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 33
- 235000019353 potassium silicate Nutrition 0.000 claims abstract description 19
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 19
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims abstract description 18
- 239000006087 Silane Coupling Agent Substances 0.000 claims abstract description 16
- 239000000853 adhesive Substances 0.000 claims abstract description 16
- 230000001070 adhesive effect Effects 0.000 claims abstract description 16
- 239000002994 raw material Substances 0.000 claims abstract description 15
- 239000010445 mica Substances 0.000 claims abstract description 11
- 229910052618 mica group Inorganic materials 0.000 claims abstract description 11
- 239000002245 particle Substances 0.000 claims description 34
- YGANSGVIUGARFR-UHFFFAOYSA-N dipotassium dioxosilane oxo(oxoalumanyloxy)alumane oxygen(2-) Chemical compound [O--].[K+].[K+].O=[Si]=O.O=[Al]O[Al]=O YGANSGVIUGARFR-UHFFFAOYSA-N 0.000 claims description 16
- 229910052627 muscovite Inorganic materials 0.000 claims description 16
- 238000003756 stirring Methods 0.000 claims description 16
- 238000010438 heat treatment Methods 0.000 claims description 9
- 238000000748 compression moulding Methods 0.000 claims description 7
- 230000004888 barrier function Effects 0.000 claims 3
- 239000012790 adhesive layer Substances 0.000 claims 1
- 238000012360 testing method Methods 0.000 description 15
- 238000011056 performance test Methods 0.000 description 12
- 230000032683 aging Effects 0.000 description 10
- 238000004321 preservation Methods 0.000 description 10
- 238000010521 absorption reaction Methods 0.000 description 8
- 241000872198 Serjania polyphylla Species 0.000 description 7
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 5
- 238000005286 illumination Methods 0.000 description 5
- 239000011734 sodium Substances 0.000 description 5
- 229910052708 sodium Inorganic materials 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 2
- 239000004480 active ingredient Substances 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- 229910001948 sodium oxide Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- C04B35/16—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay
- C04B35/18—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay rich in aluminium oxide
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Abstract
The modified ceramic heat insulation sheet comprises the following raw materials in parts by weight: 10-50 parts of silica fume; 20-50 parts of white mica sheets; 18-26 parts of an adhesive; 5-20 parts of white carbon black; 3-5 parts of glass powder; 0.8-1.6 parts of a silane coupling agent; 0.8-1.6 parts of water glass solution; 0.8-1.6 parts of calcium chloride solution. The heat insulation sheet has good structural stability, is not easy to peel, and has good heat insulation and high temperature resistance.
Description
Technical Field
The invention belongs to the technical field of heat insulation materials, and particularly relates to a modified ceramic heat insulation sheet, a preparation method and application.
Background
In recent years, the electric vehicle industry has started to burn with the national and regional governments successively developing a series of relevant policies to support and promote the development of electric vehicles, and with the shift in the ideas of electric vehicles. However, as the subsidy amount decreases year by year, the vehicle standards meeting the subsidies gradually increase, governments have higher and higher energy density requirements on power batteries, and the ternary battery gradually occupies higher and higher market share due to the advantage of the energy density of the ternary battery.
Compared with a lithium iron phosphate battery with low energy density, the ternary battery has great advantages in energy density, but is far less safe than the lithium iron phosphate battery in safety. The chemical components of the ternary battery have high activity, thermal runaway can occur at high temperature or under overcharge, and further the risk of serious harm to personal safety such as fire, explosion and the like can occur in the battery pack.
Disclosure of Invention
The modified ceramic heat insulation sheet has the advantages of good structural stability, difficult peeling and good heat insulation and high temperature resistance.
The modified ceramic heat insulation sheet comprises the following raw materials in parts by weight:
10-50 parts of silica fume;
20-50 parts of white mica sheets;
18-26 parts of an adhesive;
5-20 parts of white carbon black;
3-5 parts of glass powder;
0.8-1.6 parts of a silane coupling agent;
0.8-1.6 parts of water glass solution;
0.8-1.6 parts of calcium chloride solution.
The modified ceramic heat-insulating sheet of the invention is an improvement, the average grain diameter of the glass powder is 50-100 microns.
The modified ceramic heat insulation sheet is an improvement, and the glass powder has the particle size of more than 80 mu m accounting for more than 50 percent.
The modified ceramic heat insulation sheet is an improvement, and the average grain diameter of the silica fume is 0.8-1.2 microns.
The modified ceramic heat insulation sheet is an improvement, and the silica fume has a particle size smaller than 1 μm accounting for more than 80%.
The modified ceramic heat insulation sheet is an improvement, and the average area of the muscovite sheet is 5-8 square millimeters.
The modified ceramic heat insulation sheet is an improvement, and the average particle size of the white carbon black is 500-800 microns.
The modified ceramic heat insulation sheet is an improvement, and the white carbon black with the particle size larger than 600 mu m accounts for more than 60 percent.
The preparation method of the modified ceramic heat insulation sheet comprises the following steps: stirring and mixing the silica fume, the muscovite flake, the white carbon black, the glass powder and the silane coupling agent in the raw materials by using a stirrer at the rotating speed of 600-800 r/min, heating to 40 ℃, adding the adhesive, and continuously stirring for 10-20 min; adding a water glass solution and a calcium chloride solution, heating to 80-100 ℃, and stirring for 5-10 min; and (4) compression molding.
The invention discloses application of a modified ceramic heat-insulating sheet in a heat-insulating patch.
In the scheme of the invention, in order to overcome the defects of low strength and loose structure of the mica plate, the size and structural matching among the muscovite sheets, the silica fume, the white carbon black and the glass powder is considered for the bonding force among the components of the mica sheets, and the matching among the muscovite sheet structure, the fine powder structure of the silica fume and the particle structure/particle structure between the white carbon black and the glass powder is met, so that the effect of structure enhancement is achieved, and meanwhile, the silane coupling agent and the adhesive are adopted, so that the adhesive bonding property among materials is further enhanced, and the stability of the product structure is increased. Meanwhile, the active ingredients such as sodium oxide, calcium oxide, magnesium oxide, iron oxide, aluminum oxide and the like in the silica fume can be considered to generate hydration reaction in long-term use to be further combined with the white mica sheet, the white carbon black and the glass powder, so that the stability of long-term structure and performance is enhanced. And a proper amount of water glass and calcium chloride components (which need to be added in a proper amount to avoid structural peeling) are filled in the remaining gaps between the structures after short-term water absorption, so that the effect of supplementing and enhancing is achieved, the absorption operation is beneficial to the hydration of the active components of the silica fume and the improvement of the later heat insulation and heat dissipation effect, and the absorption/release process can be circularly realized in the long-term application. Meanwhile, the water glass also plays a role in supplementary combination to a certain extent.
Drawings
FIG. 1 is a table of the performance test of the sample of example 1.
Detailed Description
The present invention will be described in detail below with reference to various embodiments. The embodiments are not intended to limit the present invention, and structural, methodological, or functional changes made by those skilled in the art according to the embodiments are included in the scope of the present invention.
To illustrate this solution, 100g is used per part by weight in the following examples. Without limitation, other standards such as grams, kilograms, and the like may be used per part by weight within the scope of the present application.
Example 1
The modified ceramic heat insulation sheet in the embodiment comprises the following raw materials in parts by weight: 10 parts of silica fume; 40 parts of white mica sheets; 18 parts of an adhesive; 15 parts of white carbon black; 4 parts of glass powder; 1.3 parts of a silane coupling agent; 1.4 parts of 10 wt% water glass solution; 1.6 parts of 7 weight percent calcium chloride solution. The average grain diameter of the glass powder is 50-100 microns, and the grain diameter of the glass powder is more than 50% of the grain diameter of the glass powder larger than 80 microns. The average particle size of the silica fume is 0.8-1.2 μm, and the content of the silica fume with particle size less than 1 μm is more than 80%. The average area of the muscovite flakes is 5 to 8 square millimeters. The average particle size of the white carbon black is 500-800 microns, and the content of the white carbon black with the particle size larger than 600 microns accounts for more than 60 percent.
During preparation, the silica fume, the muscovite flakes, the white carbon black, the glass powder and the silane coupling agent in the raw materials are stirred and mixed by a stirrer at the rotating speed of 600-800 r/min, the temperature is raised to 40 ℃, the adhesive is added, and the stirring is continued for 12 min; adding water glass solution and calcium chloride solution, heating to 80 deg.C, and stirring for 10 min; and (4) compression molding.
And carrying out aging test and heat preservation performance test, wherein the aging test is carried out for 120 days and 240 days in an environment of 1000W high-pressure sodium lamp simulating strong illumination, 45 ℃ and 80% air humidity. The heat preservation performance test is to respectively set a 60-degree-centigrade stable heat source and a 90-degree-centigrade stable heat source on the heat absorption layer side of the unaged sample and the aged sample, and measure the temperature rise condition of the other side after testing for 120 min.
FIG. 1 shows the performance test of the sample of this example, which shows that the other properties of the sample are acceptable.
Example 2
The modified ceramic heat insulation sheet in the embodiment comprises the following raw materials in parts by weight: 20 parts of silica fume; 30 parts of white mica sheets; 26 parts of an adhesive; 5 parts of white carbon black; 3 parts of glass powder; 1.2 parts of a silane coupling agent; 1.2 parts of 6 wt% water glass solution; 0.8 part of 5 weight percent calcium chloride solution. The average grain diameter of the glass powder is 50-100 microns, and the grain diameter of the glass powder is more than 50% of the grain diameter of the glass powder larger than 80 microns. The average particle size of the silica fume is 0.8-1.2 μm, and the content of the silica fume with particle size less than 1 μm is more than 80%. The average area of the muscovite flakes is 5 to 8 square millimeters. The average particle size of the white carbon black is 500-800 microns, and the content of the white carbon black with the particle size larger than 600 microns accounts for more than 60 percent.
During preparation, the silica fume, the muscovite flakes, the white carbon black, the glass powder and the silane coupling agent in the raw materials are stirred and mixed by a stirrer at the rotating speed of 600-800 r/min, the temperature is raised to 40 ℃, the adhesive is added, and the stirring is continued for 18 min; adding water glass solution and calcium chloride solution, heating to 100 deg.C, and stirring for 8 min; and (4) compression molding.
And carrying out aging test and heat preservation performance test, wherein the aging test is carried out for 120 days and 240 days in an environment of 1000W high-pressure sodium lamp simulating strong illumination, 45 ℃ and 80% air humidity. The heat preservation performance test is to respectively set a 60-degree-centigrade stable heat source and a 90-degree-centigrade stable heat source on the heat absorption layer side of the unaged sample and the aged sample, and measure the temperature rise condition of the other side after testing for 120 min.
Example 3
The modified ceramic heat insulation sheet in the embodiment comprises the following raw materials in parts by weight: 30 parts of silica fume; 50 parts of white mica sheet; 20 parts of an adhesive; 20 parts of white carbon black; 5 parts of glass powder; 1.4 parts of a silane coupling agent; 1.6 parts of 7 wt% water glass solution; 1.4 parts of 8 weight percent calcium chloride solution. The average grain diameter of the glass powder is 50-100 microns, and the grain diameter of the glass powder is more than 50% of the grain diameter of the glass powder larger than 80 microns. The average particle size of the silica fume is 0.8-1.2 μm, and the content of the silica fume with particle size less than 1 μm is more than 80%. The average area of the muscovite flakes is 5 to 8 square millimeters. The average particle size of the white carbon black is 500-800 microns, and the content of the white carbon black with the particle size larger than 600 microns accounts for more than 60 percent.
During preparation, the silica fume, the muscovite flakes, the white carbon black, the glass powder and the silane coupling agent in the raw materials are stirred and mixed by a stirrer at the rotating speed of 600-800 r/min, the temperature is raised to 40 ℃, the adhesive is added, and the stirring is continued for 15 min; adding water glass solution and calcium chloride solution, heating to 90 deg.C, and stirring for 7 min; and (4) compression molding.
And carrying out aging test and heat preservation performance test, wherein the aging test is carried out for 120 days and 240 days in an environment of 1000W high-pressure sodium lamp simulating strong illumination, 45 ℃ and 80% air humidity. The heat preservation performance test is to respectively set a 60-degree-centigrade stable heat source and a 90-degree-centigrade stable heat source on the heat absorption layer side of the unaged sample and the aged sample, and measure the temperature rise condition of the other side after testing for 120 min.
Example 4
The modified ceramic heat insulation sheet in the embodiment comprises the following raw materials in parts by weight: 40 parts of silica fume; 20 parts of white mica sheets; 23 parts of an adhesive; 10 parts of white carbon black; 3.5 parts of glass powder; 1.6 parts of a silane coupling agent; 1 part of 9 wt% water glass solution; 1.2 parts of 6 weight percent calcium chloride solution. The average grain diameter of the glass powder is 50-100 microns, and the grain diameter of the glass powder is more than 50% of the grain diameter of the glass powder larger than 80 microns. The average particle size of the silica fume is 0.8-1.2 μm, and the content of the silica fume with particle size less than 1 μm is more than 80%. The average area of the muscovite flakes is 5 to 8 square millimeters. The average particle size of the white carbon black is 500-800 microns, and the content of the white carbon black with the particle size larger than 600 microns accounts for more than 60 percent.
During preparation, the silica fume, the muscovite flakes, the white carbon black, the glass powder and the silane coupling agent in the raw materials are stirred and mixed by a stirrer at the rotating speed of 600-800 r/min, the temperature is raised to 40 ℃, the adhesive is added, and the stirring is continued for 20 min; adding water glass solution and calcium chloride solution, heating to 85 deg.C, and stirring for 6 min; and (4) compression molding.
And carrying out aging test and heat preservation performance test, wherein the aging test is carried out for 120 days and 240 days in an environment of 1000W high-pressure sodium lamp simulating strong illumination, 45 ℃ and 80% air humidity. The heat preservation performance test is to respectively set a 60-degree-centigrade stable heat source and a 90-degree-centigrade stable heat source on the heat absorption layer side of the unaged sample and the aged sample, and measure the temperature rise condition of the other side after testing for 120 min.
Example 5
The modified ceramic heat insulation sheet in the embodiment comprises the following raw materials in parts by weight: 50 parts of silica fume; 25 parts of white mica sheets; 25 parts of an adhesive; 8 parts of white carbon black; 4.5 parts of glass powder; 0.8 part of silane coupling agent; 0.8 part of 8 wt% water glass solution; 1.4 parts of 8 weight percent calcium chloride solution. The average grain diameter of the glass powder is 50-100 microns, and the grain diameter of the glass powder is more than 50% of the grain diameter of the glass powder larger than 80 microns. The average particle size of the silica fume is 0.8-1.2 μm, and the content of the silica fume with particle size less than 1 μm is more than 80%. The average area of the muscovite flakes is 5 to 8 square millimeters. The average particle size of the white carbon black is 500-800 microns, and the content of the white carbon black with the particle size larger than 600 microns accounts for more than 60 percent.
During preparation, the silica fume, the muscovite flakes, the white carbon black, the glass powder and the silane coupling agent in the raw materials are stirred and mixed by a stirrer at the rotating speed of 600-800 r/min, the temperature is raised to 40 ℃, the adhesive is added, and the stirring is continued for 10 min; adding water glass solution and calcium chloride solution, heating to 95 deg.C, and stirring for 5 min; and (4) compression molding.
And carrying out aging test and heat preservation performance test, wherein the aging test is carried out for 120 days and 240 days in an environment of 1000W high-pressure sodium lamp simulating strong illumination, 45 ℃ and 80% air humidity. The heat preservation performance test is to respectively set a 60-degree-centigrade stable heat source and a 90-degree-centigrade stable heat source on the heat absorption layer side of the unaged sample and the aged sample, and measure the temperature rise condition of the other side after testing for 120 min.
Including but not limited to the solutions of the above examples, the samples of the present application all satisfied the performance as shown in fig. 1, so the sample performance was acceptable.
Comparative example 1
The only difference from example 1 is: no water glass solution and calcium chloride solution were added. The samples were tested under identical conditions.
Comparative example 2
The only difference from example 1 is: the average particle diameters of the white carbon black and the glass powder are both 500-800 microns, and the content of the white carbon black with the particle diameter larger than 600 microns accounts for more than 60%. The samples were tested under identical conditions.
Comparative example 3
The only difference from example 1 is: 3 parts of 10 wt% water glass solution; 5 parts of 7 weight percent calcium chloride solution. The samples were tested under identical conditions.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1. The modified ceramic heat insulation sheet comprises the following raw materials in parts by weight:
10-50 parts of silica fume;
20-50 parts of white mica sheets;
18-26 parts of an adhesive;
5-20 parts of white carbon black;
3-5 parts of glass powder;
0.8-1.6 parts of a silane coupling agent;
0.8-1.6 parts of water glass solution;
0.8-1.6 parts of calcium chloride solution.
2. The modified ceramic thermal barrier sheet of claim 1, wherein the glass frit has an average particle size of 50 to 100 μm.
3. The modified ceramic heat insulating sheet according to claim 2, wherein 50% or more of the glass frit having a particle size of more than 80 μm is contained.
4. The modified ceramic thermal barrier sheet according to claim 1, wherein the silica fume has an average particle size of 0.8 to 1.2 μm.
5. The modified ceramic heat insulating sheet according to claim 4, wherein 80% or more of the silica fume having a particle size of less than 1 μm is contained.
6. The modified ceramic thermal barrier sheet of claim 1, wherein the muscovite platelets have an average area of 5 to 8 square millimeters.
7. The modified ceramic heat insulation sheet as claimed in claim 1, wherein the average particle size of the white carbon black is 500-800 μm.
8. The modified ceramic heat-insulating sheet according to claim 7, wherein the white carbon black has a particle size of more than 600 μm accounting for 60% or more.
9. The preparation method of the modified ceramic heat insulation sheet comprises the following steps: stirring and mixing the silica fume, the muscovite flakes, the white carbon black, the glass powder and the silane coupling agent in the raw materials by using a stirrer at the rotating speed of 600-800 r/min, heating to 40 ℃, adding the adhesive, and continuously stirring for 10-20 min; adding a water glass solution and a calcium chloride solution, heating to 80-100 ℃, and stirring for 5-10 min; and (4) compression molding.
10. The application of the modified ceramic heat-insulating sheet in a heat-insulating patch comprises the modified ceramic heat-insulating sheet and an adhesive layer formed on the modified ceramic heat-insulating sheet.
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| CN112174639A (en) * | 2020-08-31 | 2021-01-05 | 浙江工业大学 | Low-temperature sintering ceramic powder for ceramic high polymer material and application thereof |
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| EP1045014A2 (en) * | 1999-04-16 | 2000-10-18 | MERCK PATENT GmbH | Pigment mixture |
| CN102969097A (en) * | 2012-12-04 | 2013-03-13 | 湖北平安电工材料有限公司 | Manufacturing method of mica plate |
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Application publication date: 20210528 |