CN114015234A - Insulating heat conduction material for electric heating tube and preparation method thereof - Google Patents
Insulating heat conduction material for electric heating tube and preparation method thereof Download PDFInfo
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- CN114015234A CN114015234A CN202111594115.4A CN202111594115A CN114015234A CN 114015234 A CN114015234 A CN 114015234A CN 202111594115 A CN202111594115 A CN 202111594115A CN 114015234 A CN114015234 A CN 114015234A
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- electric heating
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- heating tube
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- 238000005485 electric heating Methods 0.000 title claims abstract description 51
- 239000000463 material Substances 0.000 title claims abstract description 18
- 238000002360 preparation method Methods 0.000 title abstract description 7
- 239000004020 conductor Substances 0.000 claims abstract description 28
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 24
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 24
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229910052582 BN Inorganic materials 0.000 claims abstract description 18
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229920005989 resin Polymers 0.000 claims abstract description 18
- 239000011347 resin Substances 0.000 claims abstract description 18
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 13
- 239000010432 diamond Substances 0.000 claims abstract description 12
- 229910003460 diamond Inorganic materials 0.000 claims abstract description 12
- 239000002245 particle Substances 0.000 claims description 57
- 238000002156 mixing Methods 0.000 claims description 18
- 239000003822 epoxy resin Substances 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 12
- 229920000647 polyepoxide Polymers 0.000 claims description 12
- 229920001721 polyimide Polymers 0.000 claims description 10
- 239000011810 insulating material Substances 0.000 claims description 9
- 239000009719 polyimide resin Substances 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 9
- 239000000919 ceramic Substances 0.000 claims description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 4
- 238000000034 method Methods 0.000 claims 3
- 239000000454 talc Substances 0.000 claims 1
- 229910052623 talc Inorganic materials 0.000 claims 1
- 239000000126 substance Substances 0.000 abstract description 12
- 229910052751 metal Inorganic materials 0.000 description 11
- 239000002184 metal Substances 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 5
- 239000000945 filler Substances 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- PXKLMJQFEQBVLD-UHFFFAOYSA-N bisphenol F Chemical compound C1=CC(O)=CC=C1CC1=CC=C(O)C=C1 PXKLMJQFEQBVLD-UHFFFAOYSA-N 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 238000010292 electrical insulation Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000004642 Polyimide Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004841 bisphenol A epoxy resin Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L79/00—Compositions of 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 C08L61/00 - C08L77/00
- C08L79/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
- C08L79/08—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2217—Oxides; Hydroxides of metals of magnesium
- C08K2003/222—Magnesia, i.e. magnesium oxide
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/38—Boron-containing compounds
- C08K2003/382—Boron-containing compounds and nitrogen
- C08K2003/385—Binary compounds of nitrogen with boron
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/005—Additives being defined by their particle size in general
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Inorganic Insulating Materials (AREA)
Abstract
The invention belongs to the technical field of insulating heat conduction materials. The invention provides an insulating heat conduction material for an electric heating tube, which comprises the following components in parts by mass: 10-20 parts of magnesium oxide; 10-20 parts of boron nitride; 3-7 parts of diamond; 5-10 parts of resin; 3-5 parts of an auxiliary agent. The invention also provides a preparation method of the insulating heat conduction material for the electric heating tube. The reasonable components are selected, and the proportion of the components is controlled, so that the obtained insulating and heat-conducting material for the electric heating tube has excellent insulating property, heat-conducting property and chemical stability, good moisture resistance and low thermal expansion coefficient. The insulating heat-conducting material for the electric heating tube has low dielectric constant and dielectric loss, and has strong use safety under the condition of instant overload.
Description
Technical Field
The invention relates to the technical field of insulating heat conduction materials, in particular to an insulating heat conduction material for an electric heating tube and a preparation method thereof.
Background
The electric heating tube is made by filling heating wires into a seamless metal tube and then processing the seamless metal tube into various sectional materials required by users. The heat exchanger has the advantages of simple structure, high heat efficiency, good mechanical strength and good adaptability to severe environment. The electric heating tube is mainly composed of a metal tube, an electric heating wire, a powdery insulating material and an electrode, wherein the electric heating wire is arranged in the metal tube, the metal tube is filled with the powdery insulating material, such as quartz powder, magnesium oxide powder and the like, and is led out through the electrode, and heat emitted by the electric heating wire is transmitted to the metal tube through the powdery insulating material and is dissipated out through the metal tube, so that the purpose of heating is achieved. However, materials such as magnesium oxide powder and quartz powder are easily affected with damp, so that the insulation performance of the electric heating tube is reduced, and electric leakage is caused.
In order to make the electric heating tube have the insulation performance and can work effectively for a long time, the heat dissipation problem of the electric heating tube must be solved, and the continuous temperature rise is prevented to reduce the working efficiency and the service life of the electric heating tube. The traditional heat-conducting filler is metal and ceramic. Although the metal filler has good heat-conducting property, the metal filler has poor corrosion resistance and oxidation resistance and does not have insulating property; the ceramic filler has better comprehensive properties such as high-temperature oxidation resistance, corrosion resistance, thermal shock resistance and the like, but has higher filling amount and poorer mechanical property.
Therefore, the research and development of the insulating and heat conducting material for the electric heating tube, which improves the insulating property, the heat conducting property and the chemical stability and has good moisture resistance, has important research value and significance.
Disclosure of Invention
The invention aims to provide an insulating and heat-conducting material for an electric heating tube and a preparation method thereof aiming at the defects of the prior art, and aims to solve the problems of poor insulating property, poor heat-conducting property and high dielectric loss of the insulating and heat-conducting material for the electric heating tube in the prior art.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides an insulating heat conduction material for an electric heating tube, which comprises the following components in parts by mass:
preferably, the particle size of the magnesium oxide is 50-180 μm, and the particle size of the boron nitride is 80-120 μm.
Preferably, in the magnesium oxide, the mass ratio of a component with the particle size of 50-80 microns, a component with the particle size of 80-120 microns and a component with the particle size of 120-180 microns is 1-3: 2-5: 1 to 4.
Preferably, the resin contains a polyimide resin and/or an epoxy resin, and the resin is in the form of particles.
Preferably, the resin comprises the following components in a mass ratio of 3-5: 1 and an epoxy resin.
Preferably, the auxiliary agent comprises one or more of talcum powder, alumina and ceramic particles; the particle size of the auxiliary agent is 8-15 mu m.
The invention also provides a preparation method of the insulating heat conduction material for the electric heating tube, which comprises the following steps:
1) mixing magnesium oxide, boron nitride and an auxiliary agent to obtain a mixture;
2) and mixing the mixture, the diamond and the resin to obtain the insulating and heat conducting material for the electric heating tube.
Preferably, the mixing time in the step 1) is 5-15 min, and the mixing time in the step 2) is 10-20 min.
Preferably, the mixing in the step 1) and the step 2) is carried out under stirring conditions, and the stirring speed is independently 500-800 r/min.
The beneficial effects of the invention include the following:
1) the reasonable components are selected, and the proportion of the components is controlled, so that the obtained insulating and heat-conducting material for the electric heating tube has excellent insulating property, heat-conducting property and chemical stability, good moisture resistance and low thermal expansion coefficient.
2) The insulating heat-conducting material for the electric heating tube has low dielectric constant and dielectric loss, and has strong use safety under the condition of instant overload.
Detailed Description
The invention provides an insulating heat conduction material for an electric heating tube, which comprises the following components in parts by mass:
the insulating and heat conducting material for the electric heating pipe comprises 10-20 parts of magnesium oxide, preferably 12-18 parts, more preferably 14-16 parts, and even more preferably 15 parts.
The particle size of the magnesium oxide is preferably 50-180 mu m, and in the magnesium oxide, the mass ratio of a component with the particle size of 50-80 mu m, a component with the particle size of 80-120 mu m and a component with the particle size of 120-180 mu m is preferably 1-3: 2-5: 1 to 4, and more preferably 1.5 to 2.5: 3-4: 2-3, more preferably 2: 3.5: 2.5; the components with the particle size of 50-80 mu m comprise components with the particle size of 50 mu m, and do not comprise components with the particle size of 80 mu m; the components with the particle size of 80-120 mu m comprise the components with the particle size of 80 mu m, and do not comprise the components with the particle size of 120 mu m; the components with the particle size of 120-180 mu m comprise components with the particle size of 120 mu m and components with the particle size of 180 mu m.
The insulating and heat conducting material for the electric heating pipe comprises 10-20 parts of boron nitride, preferably 12-18 parts, further preferably 14-16 parts, and further preferably 15 parts; the boron nitride is preferably hexagonal boron nitride.
The particle size of the boron nitride is preferably 80-120 μm, more preferably 90-110 μm, and even more preferably 100 μm.
The boron nitride has good heat-conducting property, and the surface power can reach 50W/cm2(ii) a The boron nitride has good electrical insulation, thermal conductivity and chemical corrosion resistance, is a chemical inert material, has stable chemical property and good moisture resistance, and can effectively solve the problems of incomplete discharge of moisture and air in an electric heating tube, moisture oxidation resistance wire and metal inner wall during manufacturing.
The insulating and heat conducting material for the electric heating pipe comprises 3-7 parts of diamond, preferably 4-6 parts, and more preferably 5 parts.
The diamond of the invention has good insulating and heat conducting properties, and the heat conductivity reaches 2000W/(m.K); the diamond has stable chemical property and excellent acid and alkali resistance.
The insulating and heat conducting material for the electric heating pipe comprises 5-10 parts of resin, preferably 6-9 parts, more preferably 7-8 parts, and even more preferably 7.5 parts.
The resin preferably comprises polyimide resin and/or epoxy resin, and when the resin simultaneously comprises the polyimide resin and the epoxy resin, the mass ratio of the polyimide resin to the epoxy resin is preferably 3-5: 1, more preferably 4: 1; the epoxy resin is preferably a bisphenol a type epoxy resin or a bisphenol F type epoxy resin.
The resin is preferably granular, and the particle size of the resin is preferably 50-150 μm, more preferably 70-120 μm, and even more preferably 80-100 μm.
The resin has high insulation property and good sealing property; polyimide is an organic polymer material with very good comprehensive performance, can resist high temperature of more than 400 ℃, and has high insulating property; the epoxy resin has excellent physical and mechanical properties and electrical insulation performance, and stable chemical properties.
The insulating and heat-conducting material for the electric heating tube comprises 3-5 parts of an auxiliary agent, preferably 3.5-4.5 parts, and further preferably 4 parts.
The auxiliary agent preferably comprises one or more of talcum powder, alumina and ceramic particles; when the auxiliary agent contains several components at the same time, the components are preferably mixed in an equal mass ratio; the particle size of the auxiliary agent is preferably 8-15 μm, more preferably 10-14 μm, and even more preferably 11-12 μm.
The additive can be fully filled into gaps among magnesium oxide, boron nitride and resin. The magnesium oxide, the boron nitride, the diamond, the resin and the auxiliary agent are mutually cooperated, so that the insulating property, the heat conducting property and the moisture resistance of the insulating and heat conducting material for the electric heating tube can be obviously improved.
The invention also provides a preparation method of the insulating heat conduction material for the electric heating tube, which comprises the following steps:
1) mixing magnesium oxide, boron nitride and an auxiliary agent to obtain a mixture;
2) and mixing the mixture, the diamond and the resin to obtain the insulating and heat conducting material for the electric heating tube.
The mixing time in the step 1) of the invention is preferably 5-15 min, more preferably 7-12 min, and even more preferably 8-10 min; the mixing time in the step 2) is preferably 10-20 min, more preferably 12-18 min, and even more preferably 14-16 min.
The mixing in the step 1) and the step 2) is preferably carried out under the stirring condition, and the stirring speed is preferably 500-800 r/min, more preferably 600-700 r/min, and even more preferably 630-660 r/min independently.
The technical solutions provided by the present invention are described in detail below with reference to examples, but they should not be construed as limiting the scope of the present invention.
Example 1
Stirring and mixing 12g of magnesium oxide, 12g of hexagonal boron nitride (with the particle size of 85 microns) and 3g of talcum powder (with the particle size of 10 microns) at the rotating speed of 600r/min for 12min to obtain a mixture, wherein in the magnesium oxide, the mass ratio of a component with the particle size of 50-80 microns, a component with the particle size of 80-120 microns and a component with the particle size of 120-180 microns is 1: 2: 1. the mixture, 3g of diamond and 5g of polyimide resin (particle size: 60 μm) were stirred and mixed at a rotation speed of 600r/min for 18min to obtain an insulating and heat-conducting material for electric heating tubes.
The heat conductive insulating material for an electric heating tube in example 1 had a thermal conductivity of 32W/(m.K) and a specific resistance (25 ℃ C.) of 1.05X 1011Omega.m; coefficient of thermal expansion of 11.21X 10-6The material has low dielectric constant and low dielectric loss and good chemical stability.
Example 2
Stirring and mixing 18g of magnesium oxide, 18g of hexagonal boron nitride (with the particle size of 110 microns) and 5g of ceramic particles (with the particle size of 15 microns) for 7min at the rotating speed of 750r/min to obtain a mixture, wherein in the magnesium oxide, the mass ratio of a component with the particle size of 50-80 microns, a component with the particle size of 80-120 microns to a component with the particle size of 120-180 microns is 3: 5: 4. the mixture, 7g of diamond and 10g of polyimide resin (particle size: 130 μm) were stirred and mixed at a rotation speed of 750r/min for 12min to obtain an insulating and heat-conducting material for electric heating tubes.
The heat conductive insulating material for an electric heating tube in example 2 had a thermal conductivity of 37W/(m.K) and a specific resistance (25 ℃ C.) of 1.21X 1011Omega · m, coefficient of thermal expansion 11.13 × 10-6The material has low dielectric constant and low dielectric loss and good chemical stability.
Example 3
Stirring and mixing 14g of magnesium oxide, 18g of hexagonal boron nitride (with the particle size of 100 microns) and 4g of aluminum oxide (with the particle size of 12 microns) at the rotating speed of 700r/min for 10min to obtain a mixture, wherein in the magnesium oxide, the mass ratio of a component with the particle size of 50-80 microns, a component with the particle size of 80-120 microns to a component with the particle size of 120-180 microns is 2: 4: 3. the mixture, 5g of diamond, 8g of polyimide resin (particle size of 110 μm), and 2g of bisphenol A epoxy resin (particle size of 120 μm) were stirred and mixed at a rotation speed of 700r/min for 15min to obtain an insulating and heat-conducting material for an electric heating tube.
The heat conductive insulating material for an electric heating tube in example 3 had a thermal conductivity of 40W/(m.K) and a specific resistance (25 ℃ C.) of 1.33X 1011Omega. m, coefficient of thermal expansion 11.05X 10-6The material has low dielectric constant and low dielectric loss and good chemical stability.
Comparative example 1
The mass of the magnesium oxide and the mass of the hexagonal boron nitride in the embodiment 3 are respectively changed to 24g and 8g, and in the magnesium oxide, the mass ratio of a component with the particle size of 50-80 microns, a component with the particle size of 80-120 microns and a component with the particle size of 120-180 microns is 5: 1: 1, alumina was omitted and the other conditions were the same as in example 3.
The heat conductive insulating material for an electric heating tube of comparative example 1 had a thermal conductivity of 25W/(m.K) and a resistivity (25 ℃ C.) of 0.58X 1011Omega · m, coefficient of thermal expansion of 13.08 × 10-6/℃。
Comparative example 2
The polyimide resin and the bisphenol a type epoxy resin of example 3 were changed in mass to 5g and 5g, respectively, and magnesium oxide and diamond were omitted, and the other conditions were the same as in example 3.
The heat conductive insulating material for an electric heating tube of comparative example 2 had a thermal conductivity of 27W/(mK) and a specific resistance (25 ℃ C.) of 1.2X 1010Omega. m, coefficient of thermal expansion of 13.55X 10-6/℃。
From examples 1 to 3, it is known that the insulating and heat conducting material for an electric heating tube of the present invention has an excellent thermal conductivity, a high resistivity, a low thermal expansion coefficient, a low dielectric constant and a low dielectric loss, and a good chemical stability. From example 3 and comparative examples 1 and 2, it can be seen that changing the components and the proportion of the insulating and heat conducting material of the present invention, and changing the proportion of the particle size in the components all results in the performance of the insulating and heat conducting material being reduced.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (9)
1. The insulating heat conduction material for the electric heating pipe is characterized by comprising the following components in parts by mass:
2. the heat insulating and conducting material for electric heating tubes according to claim 1, wherein the magnesium oxide has a particle size of 50 to 180 μm, and the boron nitride has a particle size of 80 to 120 μm.
3. The insulating and heat-conducting material for the electric heating pipe according to claim 1 or 2, wherein the mass ratio of the component with the particle size of 50-80 μm, the component with the particle size of 80-120 μm and the component with the particle size of 120-180 μm in the magnesium oxide is 1-3: 2-5: 1 to 4.
4. The insulating and heat-conducting material for an electric heating tube according to claim 3, wherein the resin contains a polyimide resin and/or an epoxy resin, and the resin is in the form of particles.
5. The insulating and heat-conducting material for the electric heating pipe according to claim 4, wherein the resin comprises the following components in a mass ratio of 3-5: 1 and an epoxy resin.
6. The insulating and heat-conducting material for the electric heating pipe as claimed in claim 2, 4 or 5, wherein the auxiliary agent comprises one or more of talc, alumina and ceramic particles; the particle size of the auxiliary agent is 8-15 mu m.
7. The method for preparing the insulating and heat-conducting material for the electric heating tube according to any one of claims 1 to 6, characterized by comprising the following steps:
1) mixing magnesium oxide, boron nitride and an auxiliary agent to obtain a mixture;
2) and mixing the mixture, the diamond and the resin to obtain the insulating and heat conducting material for the electric heating tube.
8. The method according to claim 7, wherein the mixing time in step 1) is 5 to 15min, and the mixing time in step 2) is 10 to 20 min.
9. The method of claim 7 or 8, wherein the mixing in step 1) and step 2) is performed under stirring conditions, and the stirring rate is independently 500 to 800 r/min.
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| CN202111594115.4A CN114015234A (en) | 2021-12-23 | 2021-12-23 | Insulating heat conduction material for electric heating tube and preparation method thereof |
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| CN202111594115.4A CN114015234A (en) | 2021-12-23 | 2021-12-23 | Insulating heat conduction material for electric heating tube and preparation method thereof |
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| CN110862686A (en) * | 2019-11-20 | 2020-03-06 | 天津工业大学 | High-molecular heat-conducting composite material and preparation method thereof |
| CN110951254A (en) * | 2019-11-24 | 2020-04-03 | 上海大学 | Boron nitride composite high-thermal-conductivity insulating polymer composite material and preparation method thereof |
| JPWO2021149690A1 (en) * | 2020-01-20 | 2021-07-29 |
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