CN113436945B - Gas-generating arc-extinguishing powder and preparation method thereof - Google Patents
Gas-generating arc-extinguishing powder and preparation method thereof Download PDFInfo
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- CN113436945B CN113436945B CN202110704111.0A CN202110704111A CN113436945B CN 113436945 B CN113436945 B CN 113436945B CN 202110704111 A CN202110704111 A CN 202110704111A CN 113436945 B CN113436945 B CN 113436945B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
- H01H85/02—Details
- H01H85/38—Means for extinguishing or suppressing arc
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H69/00—Apparatus or processes for the manufacture of emergency protective devices
- H01H69/02—Manufacture of fuses
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
- H01H85/02—Details
- H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
- H01H85/041—Fuses, i.e. expendable parts of the protective device, e.g. cartridges characterised by the type
- H01H85/044—General constructions or structure of low voltage fuses, i.e. below 1000 V, or of fuses where the applicable voltage is not specified
- H01H85/045—General constructions or structure of low voltage fuses, i.e. below 1000 V, or of fuses where the applicable voltage is not specified cartridge type
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
- H01H85/02—Details
- H01H85/38—Means for extinguishing or suppressing arc
- H01H85/42—Means for extinguishing or suppressing arc using an arc-extinguishing gas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
- H01H85/02—Details
- H01H85/38—Means for extinguishing or suppressing arc
- H01H2085/388—Means for extinguishing or suppressing arc using special materials
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Abstract
The invention relates to gas-generating arc-extinguishing powder and a preparation method thereof, wherein the gas-generating arc-extinguishing powder comprises fumed silica nano powder with the same heat conductivity coefficient as air, and inorganic flame retardant, organic flame retardant, modified melamine formaldehyde resin and silicate are added to ensure that the arc-extinguishing powder can release gas when electric arc is generated, so that the concentration and collision probability of metal ions are reduced, and the arc is extinguished quickly by virtue of the dissociation elimination effect. And ensures that the breaking capacity of the product meets the requirement of DC300V 400A.
Description
Technical Field
The invention relates to arc extinguishing powder for arc extinguishing of a tubular fuse, in particular to arc extinguishing powder with a gas production effect and a preparation method of the arc extinguishing powder.
Background
The surface-mounted tubular micro fuse product with the breaking capacity of DC300V400A or more generally needs to be filled with arc extinguishing materials to extinguish electric arcs generated when metal melts are fused by overcurrent and buffer huge impact on a fuse shell caused by explosion pressure generated at the moment of fusing.
Besides generating a large amount of heat energy during the breaking process, the melt is accompanied by two forms of pressure: the melt is gasified and arcing to generate explosion pressure in a pulse form and arcing pressure generated in the whole arcing period. The conventional arc-extinguishing material can generally carry out physical and chemical changes such as pyrolysis, melting, evaporation, sublimation, erosion and the like on the material under the action of high-temperature heat flow, so that the heat is taken away by causing mass consumption on the surface of the material, and the influence of heat energy generated when a melt is cut off is reduced. However, due to the existence of high temperature, conventional arc extinguishing materials such as quartz sand, silica gel, thermosetting resin, glass coating and the like do not have elastic buffering capacity for explosion pressure, and pyrolysis gas generated by an arc extinguishing component can cause pressure rise inside an arc extinguishing device, so that poor breaking of a fuse is easily caused during continuous arcing.
The existing low-voltage fuse generally uses high-purity quartz sand as an arc extinguishing material under the conditions of high voltage and high breaking capacity, mainly because the quartz sand has higher heat conductivity and insulating performance and has a large contact area with an electric arc, the quartz sand is convenient to absorb the energy of the electric arc, so that the electric arc can be rapidly cooled, and the fuse can safely break a short-circuit current. However, the quartz sand as a filler of the fuse has the following problems: the quartz sand is used as a mineral substance, is greatly influenced by a production place, and is difficult to remove metal impurities such as iron and the like; the surface of the quartz sand is rough, so that the uniformity of the filling density is difficult to control during the assembly of the fuse, and the breaking effect is further influenced; the thermal conductivity is large, the heat dissipation is fast, and the fuse is difficult to break and overload at low power.
Meanwhile, as electronic equipment products develop towards miniaturization and portability, the space of a circuit board is reduced, the volume of a fuse is further reduced, and meanwhile, the fuse needs to be subjected to chip mounting, high voltage resistance, high current and high breaking capacity. Therefore, there is a need to develop a new arc-extinguishing material.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide novel gas-generating arc-extinguishing powder for solving the technical problem of how to reduce the concentration and collision probability of metal ions and generate dissociation elimination effect to quickly extinguish electric arcs.
The invention also provides a preparation method of the arc extinguishing powder.
In order to achieve the purpose, the arc extinguishing powder adopts the following technical scheme:
gas-generating arc extinguishing powder comprises 5-30 wt% of fumed silica powder, 10-20 wt% of an inorganic flame retardant, 20-40 wt% of an organic flame retardant, 30-40 wt% of a nano-pore structure melamine phenolic composite aerogel and 10-30 wt% of silicate.
Furthermore, the mesh number of the fumed silica powder is 500-1000 meshes.
Further, the inorganic flame retardant is Al (OH)3Or Mg (OH).
Further, the silicate is magnesium silicate.
Further, the organic flame retardant is melamine modified urea-formaldehyde resin.
Further, the melamine-phenolic composite aerogel with the nano-pore structure is prepared by compounding resorcinol-formaldehyde and melamine, and then performing ethanol solvent replacement and supercritical drying.
Furthermore, the gas-generating arc-extinguishing powder is used for filling an insulating tube of the tubular fuse.
The preparation method of the gas-generating arc-extinguishing powder can adopt the following technical scheme:
comprises the following steps of (a) carrying out,
(1) weighing materials: weighing various raw materials with required mass according to a formula proportion for later use;
(2) adding an inorganic flame retardant into fumed silica powder: mixing and granulating inorganic flame retardant powder with required mass ratio and the fumed silica powder obtained in the step 1) in a granulator to ensure that the inorganic flame retardant powder is uniformly coated on the surface of the fumed silica powder;
(3) adding silicate: mixing silicate powder with required mass ratio and the coated powder obtained in the step (2) in a granulator for granulation, so that the silicate powder is uniformly coated on the surface of the powder;
(4) adding an organic flame retardant: mixing and granulating the organic flame retardant powder with the required mass ratio and the coated powder obtained in the step (3) in a granulator to uniformly coat the organic flame retardant powder on the surface of the powder;
(5) adding the melamine phenolic aldehyde composite aerogel with the nano-pore structure: resorcinol: formaldehyde: melamine: ethanol: mixing acids according to a molar ratio of 1: 3-4: 0.02-0.2: 10-12: 0.06-0.08, magnetically stirring, placing the mixture in an oven for gelation, uniformly preparing melamine-doped resorcinol-formaldehyde sol, grinding the melamine-doped resorcinol-formaldehyde sol into powder by using an agate mortar, screening out 80-120 meshes by using a screen, mixing the coated powder obtained in the step (4) with the coated powder in a granulator for granulation, and uniformly coating the melamine-phenolic composite aerogel with a nano-pore structure on the surface of the powder to obtain a spherical arc extinguishing material;
(6) drying and baking: and (5) placing the spherical arc-extinguishing material obtained in the step (5) into a drying oven to be baked for a period of time, and then taking out.
Further, the melamine phenolic aldehyde composite aerogel with the nano-pore structure in the step (5) is prepared by the following steps: resorcinol: formaldehyde: melamine: ethanol: the acid is added in a molar ratio of 1:3:0.1:11: 0.06.
Further, the drying and baking conditions in the step (6) are as follows: baking at 125 deg.C for 20min or 100 deg.C for 30 min.
Has the advantages that: compared with the prior art, the gas-generating arc-extinguishing powder provided by the invention has the following beneficial effects.
1. Is non-toxic, harmless, environment-friendly and safe. The inorganic flame retardant in the formula is Al (OH)3It is a clean flame retardant with low cost and without smoke or corrosive or toxic gas generation during combustion.
2. And (4) rapidly quenching the arc. The melamine modified urea-formaldehyde resin, the nano-pore structure melamine phenolic aldehyde composite aerogel and the silicate are high breaking capacity arc extinguishing powder materials with main crystal phases, so that under the high-temperature firing of electric arcs in breaking, the amino resin can not only decompose a large amount of hydrogen, nitrogen, water vapor, carbon monoxide, carbon dioxide and other gases beneficial to arc extinguishing, but also is light in carbonization. Inorganic flame retardant Al (OH)3、Mg(OH)2Under the high-temperature ignition of electric arc, water vapor is generated at 210-220 ℃, carbon monoxide and hydrogen are generated by the action of the water vapor and the carbon, the two endothermic reactions play roles of cooling the electric arc, accelerating the dissociation removal, facilitating the arc extinction, and removing the carbon deposited on the surface to generate CO2Gas and H which more readily extinguishes the arc2. And the internal pressure of the product is increased, the concentration and collision probability of metal ions are reduced, and the dissociation effect is generated to quickly extinguish the electric arc.
3. The arc quenching capability is strong. At present, the capacity of arc-extinguishing materials in the industry is mostly about DC250V 100A, with the development of electronic equipment products towards miniaturization and portability, the space of a circuit board is reduced, the volume of a fuse is further reduced, and meanwhile, the fuse needs to be pasted with a chip, high in voltage resistance, large in current and high in breaking capacity. The breaking capacity of the gas-generating arc-extinguishing material prepared by the invention can reach DC300V400A and above.
Drawings
FIG. 1 is an appearance diagram of Fujian product 100-200 mesh quartz sand in the prior art;
FIG. 2 is a waveform diagram of a test conducted at DC300V400A using 100-200 mesh quartz sand produced by Fujian province in the prior art as a filling material;
FIG. 3 is an appearance diagram of the gas-generating arc-extinguishing material of 100-200 mesh in the present invention;
FIG. 4 is a waveform diagram of 100-200 mesh gas-generating arc-extinguishing material prepared in example 1 of the present invention tested at DC300V 400A.
Detailed Description
The invention provides a gas-generating arc-extinguishing powder
The arc extinguishing powder with the low thermal conductivity coefficient comprises 5-30 wt% of fumed silica powder, 10-20 wt% of an inorganic flame retardant, 20-40 wt% of an organic flame retardant, 30-40 wt% of a nano-pore structure melamine phenolic composite aerogel and 10-30 wt% of silicate.
The fumed silica powder is micron-sized powder with the mesh number of about 500-1000 meshes, and the main characteristic is that the heat conductivity coefficient of the fumed silica powder is equivalent to that of air; the inorganic flame retardant, such as Mg (OH)2, Al (OH)3 and the like, such as Al (OH)3, does not smoke or generate corrosive or toxic gas during combustion, has low cost and is a clean flame retardant. Al (OH)3 begins to generate water vapor at 210 ℃ to 220 ℃ as follows:
the water vapor and the carbon act simultaneously to generate carbon monoxide and hydrogen, and the formula is as follows:
these two endothermic reactions serve to cool the arc, accelerate deionization, facilitate arc quenching, and remove carbon deposited on the surface, producing CO2 gas and H2 which more readily extinguishes the arc. Al (OH)3 is an inert compound, and can form a good insulating layer, so that the insulation resistance of the product is recovered quickly. The organic flame retardant, such as melamine, melamine modified urea-formaldehyde resin, melamine cyanurate, organic silicon and the like, for example, the melamine modified urea-formaldehyde resin is formed by copolycondensation of urea, melamine and formaldehyde. From the viewpoint of their molecular structures, the carbon atom contents were low, 12.5%, 20%, and 22%, respectively. Therefore, the condensed amino resin has low carbon atom content and high hydrogen and nitrogen atom content, so that under the high-temperature burning of the electric arc, the amino resin can not only decompose a large amount of gases which are beneficial to arc extinguishing, such as hydrogen, nitrogen, water vapor, carbon monoxide, carbon dioxide and the like, but also has light carbonization; the melamine-phenolic composite aerogel with the nano-pore structure is prepared by compounding RF (resorcinol-formaldehyde) and melamine, and then performing ethanol solvent replacement and supercritical drying. The silicate, such as magnesium silicate Mg3 [ Si4O10 ] (OH)2, iron silicate, aluminum silicate, etc., has excellent physical properties such as lubricity, anti-sticking property, flow aid, fire resistance, insulation property, high melting point, chemical inactiveness, good covering power, softness, good gloss, strong adsorption power, etc.
The preparation method of the gas-generating arc-extinguishing powder can adopt the following technical scheme:
comprises the following steps of (a) preparing a solution,
(1) weighing materials: weighing various raw materials with required mass according to a formula proportion for later use;
(2) adding an inorganic flame retardant into fumed silica powder: mixing and granulating inorganic flame retardant powder with required mass ratio and the fumed silica powder obtained in the step 1) in a granulator to ensure that the inorganic flame retardant powder is uniformly coated on the surface of the fumed silica powder;
(3) adding silicate: mixing silicate powder with required mass ratio and the coated powder obtained in the step (2) in a granulator for granulation, so that the silicate powder is uniformly coated on the surface of the powder;
(4) adding an organic flame retardant: mixing and granulating the organic flame retardant powder with the required mass ratio and the coated powder obtained in the step (3) in a granulator to uniformly coat the organic flame retardant powder on the surface of the powder;
(5) adding the melamine phenolic aldehyde composite aerogel with the nano-pore structure: resorcinol: formaldehyde: melamine: ethanol: mixing acids according to a molar ratio of 1: 3-4: 0.02-0.2: 10-12: 0.06-0.08, magnetically stirring, placing the mixture in an oven for gelation, uniformly preparing melamine-doped resorcinol-formaldehyde sol, grinding the melamine-doped resorcinol-formaldehyde sol into powder by using an agate mortar, screening out 80-120 meshes by using a screen, mixing the coated powder obtained in the step (4) with the coated powder in a granulator for granulation, and uniformly coating the melamine-phenolic composite aerogel with a nano-pore structure on the surface of the powder to obtain a spherical arc extinguishing material;
(6) drying and baking: and (5) placing the spherical arc-extinguishing material obtained in the step (5) into a drying oven to be baked for a period of time, and then taking out.
The technical effect of the gas-generating arc-extinguishing powder provided by the invention is illustrated by specific examples and test conclusions.
Example 1:
weighing fumed silica powder in a container according to the mass ratio: melamine modified urea resin: adding 5 wt% of magnesium silicate, 25 wt% of magnesium silicate and 30 wt% of magnesium silicate into the container while stirring, then pouring into a granulator for granulation, sieving out the magnesium silicate by a 100-200 mesh sieve, and placing the magnesium silicate into another clean container to obtain the semi-finished spherical powder 1. And (5) adding semi-finished spherical powder 1 in the mass ratio according to the step (4): al (OH)3And (3) putting the powder in a container containing the semi-finished spherical powder 1 in a proportion of 60 wt% to 10 wt%, fully stirring and mixing the mixture by using a glass rod, pouring the mixture into a granulator again for secondary granulation, and sieving the mixture by using a sieve of 100-200 meshes to obtain the powder 2. Then, the resorcinol: formaldehyde: melamine: ethanol: mixing acids according to a molar ratio of 1:3:0.1:11:0.06, magnetically stirring, placing in an oven for gelation, uniformly preparing melamine doped resorcinol-formaldehyde (N-RF) sol, grinding into powder by using an agate mortar, screening out powder 3 with 80-120 meshes by using a screen, weighing 30 wt% of the powder, placing the powder 2 and the powder 3 in a granulator for mixing granulation, uniformly coating the surface of the powder 2 with the melamine-phenolic composite aerogel powder 3 with a nano-pore structure, obtaining a spherical arc extinguishing material, and placing in a tray. And placing the arc extinguishing powder into an oven to bake for 20min at 125 ℃ to obtain 100-200 mesh arc extinguishing powder.
The breaking capacity test after filling is carried out on the surface-mounted tubular fuse product with the size of 10mm x 3.2mm and the rated current of 40A, the product obtained by assembling Ag 100% sheets is used for carrying out the breaking capacity test of DC300V400A on the product filled with the arc extinguishing powder with the formula of the embodiment, and the requirement of the breaking condition can be met. The test waveform is shown in fig. 4.
As a comparative example, a surface-mounted tubular fuse product with the size of 10mm x 3.2mm and the rated current of 40A is filled with 100-200 mesh quartz sand of Fujian in the prior art and then is subjected to a DC300V400A breaking capacity test, the breaking condition cannot be met, the fuse tube body is burst, and the test waveform is shown in FIG. 2.
Example 2:
weighing fumed silica in a container according to the mass ratio: melamine modified urea resin: 10 wt% of magnesium silicate and 20 wt% of magnesium silicate are added into the container while stirring, then poured into a granulator for granulation, sieved out by a 100-200 mesh sieve and placed into another clean container to obtain a semi-finished spherical powder 1. And (5) adding semi-finished spherical powder 1 in the mass ratio according to the step (4): mg (OH)2Adding 50 wt% to 15 wt% of resorcinol into a container containing the semi-finished spherical powder 1, fully stirring and mixing with a glass rod, pouring into a granulator again for secondary granulation, sieving by using a 100-200 mesh sieve to obtain powder 2, and mixing the resorcinol: formaldehyde: melamine: ethanol: mixing acids according to a molar ratio of 1:4:0.08:10:0.07, magnetically stirring, placing in an oven for gelling, uniformly preparing melamine-doped resorcinol-formaldehyde (N-RF) sol, grinding into powder by using an agate mortar, screening out 100-120 meshes of powder 3 by using a screen, weighing 35 wt% of the powder, placing the powder 2 and the powder 3 in a granulator for mixing granulation, uniformly coating the surface of the powder 2 with the nano-pore structure melamine-phenolic composite aerogel powder 3, obtaining a spherical arc extinguishing material, and placing in a tray. And putting the arc extinction powder into an oven to be baked for 30min at 100 ℃ to obtain the arc extinction powder with the mesh number of 100-200.
The breaking capacity test after filling is carried out on the surface-mounted tubular fuse product with the size of 10mm x 3.2mm and the rated current of 40A, the product obtained by assembling Ag 100% sheets is subjected to the breaking capacity test of DC300V400A on the product filled with the arc extinguishing powder with the formula of the embodiment, and the requirement of the breaking condition can be met.
Example 3:
weighing fumed silica in a container according to the mass ratio: trimerization ofCyanamide modified urea resin: adding 15 wt% of magnesium silicate and 25 wt% of magnesium silicate into the container while stirring, then pouring into a granulator for granulation, sieving out the magnesium silicate by a 100-200 mesh sieve, and placing the magnesium silicate into another clean container to obtain the semi-finished spherical powder 1. And (5) adding semi-finished spherical powder 1 in the mass ratio according to the step (4): al (OH)3Mixing 50 wt% and 10 wt% in a container containing semi-finished spherical powder 1, stirring and mixing fully with a glass rod, pouring into a granulator again for secondary granulation, sieving by a 100-200 mesh sieve to obtain powder 2, and mixing resorcinol: formaldehyde: melamine: ethanol: mixing acids according to a molar ratio of 1:3.5:0.2:12:0.08, magnetically stirring, placing the mixture in an oven for gelation, uniformly preparing melamine-doped resorcinol-formaldehyde (N-RF) sol, grinding the sol into powder by using an agate mortar, screening 100-120 meshes of powder 3 by using a screen, weighing the powder 3 by mass percent of 40 wt%, placing the powder 2 and the powder 3 in a granulator for mixing granulation, uniformly coating the surface of the powder 2 with the nano-pore structure melamine-phenolic composite aerogel powder 3 to obtain a spherical arc extinguishing material, and placing the spherical arc extinguishing material in a tray. And putting the arc extinction powder into an oven to be baked for 20min at 125 ℃ to obtain the arc extinction powder with the mesh number of 100-200.
The breaking capacity test after filling is carried out on the surface-mounted tubular fuse product with the size of 10mm × 3.2mm and the rated current of 40A, the product obtained by assembling Ag 100% sheets is subjected to the breaking capacity test of DC300V400A on the product filled with the arc extinguishing powder according to the formula of the embodiment, and the requirements of the breaking conditions can be met.
In addition, the present invention has many specific implementations and ways, and the above description is only a preferred embodiment of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be construed as the protection scope of the present invention.
Claims (10)
1. The gas-generating arc extinguishing powder is characterized by comprising 5-30 wt% of fumed silica powder, 10-20 wt% of an inorganic flame retardant, 20-40 wt% of an organic flame retardant, 30-40 wt% of a nano-pore structure melamine-phenolic composite aerogel and 10-30 wt% of silicate.
2. The gas and arc extinguishing powder of claim 1, wherein the fumed silica powder has a mesh size of 500-1000 mesh.
3. The gas-generating arc extinguishing powder of claim 2, wherein the inorganic flame retardant is Al (OH)3Or Mg (OH).
4. A gas and arc suppressing powder as claimed in claim 1, 2 or 3 wherein said silicate is magnesium silicate.
5. The gas and arc extinguishing powder according to claim 1, 2 or 3, wherein the organic flame retardant is melamine modified urea formaldehyde resin.
6. Gas-and arc-extinguishing powder according to claim 1, 2 or 3, characterized in that the nanoporous melamine-phenolic composite aerogel is obtained by compounding resorcinol-formaldehyde and melamine, followed by solvent displacement with ethanol and supercritical drying.
7. The gas-generating arc-extinguishing powder according to claim 1, 2 or 3, wherein the gas-generating arc-extinguishing powder is used for filling an insulating tube of a tubular fuse.
8. A process for the production of gas-generating arc-extinguishing powders according to any of claims 1 to 5, characterized in that it comprises the following steps,
(1) weighing materials: weighing various raw materials with required mass according to a formula proportion for later use;
(2) adding an inorganic flame retardant into fumed silica powder: mixing and granulating inorganic flame retardant powder with required mass ratio and the fumed silica powder obtained in the step (1) in a granulator to ensure that the inorganic flame retardant powder is uniformly coated on the surface of the fumed silica powder;
(3) adding silicate: mixing silicate powder with required mass ratio and the coated powder obtained in the step (2) in a granulator for granulation, so that the silicate powder is uniformly coated on the surface of the powder;
(4) adding an organic flame retardant: mixing and granulating the organic flame retardant powder with the required mass ratio and the coated powder obtained in the step (3) in a granulator to ensure that the organic flame retardant powder is uniformly coated on the surface of the powder;
(5) adding the melamine phenolic aldehyde composite aerogel with the nano-pore structure: resorcinol: formaldehyde: melamine: ethanol: mixing acids according to a molar ratio of 1: 3-4: 0.02-0.2: 10-12: 0.06-0.08, magnetically stirring, placing the mixture in an oven for gelation, uniformly preparing melamine-doped resorcinol-formaldehyde sol, grinding the melamine-doped resorcinol-formaldehyde sol into powder by using an agate mortar, screening out 80-120 meshes by using a screen, mixing the coated powder obtained in the step (4) with the coated powder in a granulator for granulation, and uniformly coating the melamine-phenolic composite aerogel with a nano-pore structure on the surface of the powder to obtain a spherical arc extinguishing material;
(6) drying and baking: and (5) placing the spherical arc-extinguishing material obtained in the step (5) into a drying oven to be baked for a period of time, and then taking out.
9. The preparation method according to claim 8, wherein the nanoporous melamine phenolic composite aerogel in the step (5) is prepared according to the following steps: resorcinol: formaldehyde: melamine: ethanol: the acid is added in a molar ratio of 1:3:0.1:11: 0.06.
10. The production method according to claim 9, wherein the drying and baking conditions in the step (6) are: baking at 125 deg.C for 20min or 100 deg.C for 30 min.
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