CN115534435A - Method for recycling cured felt - Google Patents
Method for recycling cured felt Download PDFInfo
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- CN115534435A CN115534435A CN202211360715.9A CN202211360715A CN115534435A CN 115534435 A CN115534435 A CN 115534435A CN 202211360715 A CN202211360715 A CN 202211360715A CN 115534435 A CN115534435 A CN 115534435A
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- 238000004064 recycling Methods 0.000 title claims abstract description 22
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Abstract
The invention provides a method for recycling a cured felt, which comprises the following steps: s1) processing abnormal parts of the damaged and cured felt to form parts to be repaired with suede, and providing a graphite felt with the same area as the abnormal parts, wherein the thickness of the graphite felt is larger than that of the damaged and cured felt; s2) coating the graphite felt with a graphite adhesive bonding material to completely fill the damaged and cured felt at the position to be repaired with the graphite felt; s3) laminating and pressing the cured felt filled with the graphite felt to ensure that the part to be repaired is completely combined with the graphite felt and has integrally consistent density; and S4) carrying out high-temperature treatment on the laminated and pressed cured felt composite coating to obtain the repaired cured felt. The relevant technological indexes of the repaired curing felt meet the use requirements, namely the original technical indexes of the curing felt can be achieved after repair; when the thermal field is applied under the condition of cyclic heating, the condition of falling-off can not occur, the service life of the curing felt is effectively prolonged, and the popularization and the application are facilitated.
Description
Technical Field
The invention relates to the technical field of curing felts, in particular to a method for recycling a curing felt.
Background
In recent years, the single crystal photovoltaic industry has been rapidly developed. In the preparation process of the single crystal photovoltaic module, firstly, a silicon material needs to be melted, and a polycrystalline silicon material is extracted into a single crystal silicon rod through a seeding means. The working temperature of the link exceeds 1400 ℃, and meanwhile, a large amount of silicon steam is filled in the working area. Due to the complex environmental working conditions, high-temperature resistant materials such as the curing felt and the like are easy to react with silicon vapor, so that the high-temperature resistant materials are aged. At present, a cured felt is a carbon fiber heat-insulating material which is usually prepared by weaving carbon fibers into a net and performing needle punching forming on a prepared carbon fiber soft felt, and performing gum dipping, layering, mould pressing, curing forming and carbonization graphitization on the carbon fiber soft felt; or mixing short fiber and resin into slurry, suction filtering to form prefabricated blank, curing to form and carbonizing to obtain the carbon fiber composite material.
Due to the influences of factors such as insufficient vacuum degree of a single crystal furnace, gas corrosion and the like, the problems of oxidation felt falling, pulverization and the like are inevitable after the solidified felt is used for a long time, so that the heat preservation performance of the solidified felt is reduced to the extent that the solidified felt cannot be normally used, and the influence is caused on production. As an important thermal insulation material of a single crystal thermal field, the solidified felt can only be withdrawn from use after being pulverized, and the production cost is increased due to high value.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the method for recycling the solidified felt, which can repair the locally pulverized solidified felt and reuse the solidified felt as the single crystal thermal field heat insulation material, thereby improving the repeated recycling rate of the solidified felt and reducing the use cost of the heat insulation material.
The invention provides a method for recycling a cured felt, which comprises the following steps:
s1) processing an abnormal part of a damaged and cured felt to form a part to be repaired with a suede, and providing a graphite felt with the same area as the abnormal part, wherein the thickness of the graphite felt is larger than that of the damaged and cured felt;
s2) coating the graphite felt with a graphite adhesive bonding material to completely fill the damaged and cured felt at the position to be repaired with the graphite felt;
s3) laminating and pressing the cured felt filled with the graphite felt to ensure that the part to be repaired is completely combined with the graphite felt and has integrally consistent density;
and S4) carrying out high-temperature treatment on the laminated and pressed curing felt composite coating to obtain a repaired curing felt, wherein the coating comprises the raw materials of silicon carbide, graphite powder, a curing agent and organic silicon resin.
In an embodiment of the present invention, in step S1), the processing of the abnormal portion of the damaged and cured mat specifically includes: and cutting the abnormal part of the damaged curing felt, then flushing the curing felt by using high-pressure gas, and blowing off fiber scraps with fractured surfaces to obtain the cleaned damaged curing felt.
In the embodiment of the invention, in the step S1), the high-pressure gas for flushing and cleaning is inert gas, and the water content is less than 1ppm.
In the embodiment of the invention, in the step S1), the graphite felt is manufactured in a multi-layer stacking mode, and the total thickness of the graphite felt is 1.2-1.4 times of that of the damaged and cured felt.
In the embodiment of the invention, in the step S2), the graphite adhesive bonding material is obtained by mixing graphite adhesive and an organic solvent, and the graphite adhesive bonding material is coated on the surface of the portion to be repaired of the damaged cured felt and the surface of the graphite felt, so that the graphite felt is completely filled in the portion to be repaired of the damaged cured felt.
In the embodiment of the invention, in the step S2), the organic solvent is absolute ethyl alcohol, and the coating amount of the graphite adhesive bonding material is 800-1400 g/m 2 The thickness is between 0.75 and 1.10 mm.
In the inventionIn the examples, in the step S3), the lamination is performed so that the density is 0.18 to 0.25g/cm 3 。
In the embodiment of the invention, in the step S4), the weight ratio of the silicon carbide, the graphite powder, the curing agent and the organic silicon resin is 30-40: 20 to 35:10 to 20:40 to 50.
In the embodiment of the invention, in the step S4), the coating material is sprayed on the surface of the cured felt after lamination pressing, and is heated and cured under a vacuum condition, and then the secondary spraying of the coating material is performed, and the cured felt after repair is obtained after calcination and curing.
In the embodiment of the invention, in the step S4), the temperature for heating and curing is 190-210 ℃ and the time is 2-3 h; the temperature of the calcination and solidification is 390 to 410 ℃, and the time is 6 to 8 hours.
The embodiment of the invention provides a process method for repairing a solidified felt through cutting, filling, coating and the like after local pulverization, wherein the graphite felt is used for filling, and is coated with a graphite adhesive bonding material and then laminated, so that a repaired part of the graphite felt is combined with the solidified felt; through high-temperature calcination treatment and surface coating material spraying, the conditions that silicon steam erodes the inside of the solidified felt and broken fibers of the solidified felt scatter to the outside can be prevented, and the coating material and the solidified felt have good adhesive force. The relevant technological indexes of the repaired curing felt meet the use requirements, namely the repaired curing felt can reach the original technical indexes of the curing felt; when the thermal field is applied under the condition of cyclic heating, the condition of falling-off can not occur, and the service life of the curing felt is effectively prolonged. For the problem of high manufacturing cost of the current large-size curing felt, the invention can effectively reduce the use cost and is beneficial to industrial large-scale popularization.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention.
FIG. 1 is a schematic process flow diagram provided by an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
The invention provides a method for recycling a cured felt, which comprises the following steps:
s1) processing an abnormal part of a damaged and cured felt to form a part to be repaired with a suede, and providing a graphite felt with the same area as the abnormal part, wherein the thickness of the graphite felt is larger than that of the damaged and cured felt;
s2) coating the graphite adhesive bonding material to enable the part to be repaired of the damaged and cured felt to be completely filled with the graphite felt;
s3) laminating and pressing the cured felt filled with the graphite felt to ensure that the part to be repaired is completely combined with the graphite felt and has integrally consistent density;
and S4) carrying out high-temperature treatment on the laminated and pressed curing felt composite coating to obtain a repaired curing felt, wherein the coating comprises the raw materials of silicon carbide, graphite powder, a curing agent and organic silicon resin.
The method can repair the locally pulverized solidified felt, and the solidified felt can be reused as a single crystal thermal field heat insulation material, so that the repeated reutilization rate of the solidified felt is improved, and the use cost of the heat insulation material is reduced.
FIG. 1 is a schematic view of a process flow of local pulverization, repair and reuse of a cured felt according to an embodiment of the present invention; as shown in fig. 1, an example of the invention first performs a pretreatment of the powdered consolidated mat: cutting the abnormal parts of the damaged curing felt such as local pulverization, cutting the pulverization hardened part completely, then flushing the curing felt by using high-pressure gas, blowing off fiber scraps broken on the surface, and obtaining the cleaned damaged curing felt.
And cutting and manufacturing the graphite felt with the same size as the part to be repaired according to the size of the cutting part of the cured felt, wherein the manufacturing thickness of the graphite felt is larger than that of the damaged cured felt, and the size of the graphite felt can be determined according to the size of the part to be repaired.
In the embodiment of the invention, the area proportion of the pulverized part of the damaged and cured felt is below 50%, and the proportion is too large and has no maintenance value. Because the density of the cured felt is higher than that of the graphite felt (generally, the density of the cured felt is 0.18-0.25 g/cm) 3 Graphite felt density of 0.1-0.12g/cm 3 ) And the cutting part of the curing felt needs to be designed into a suede surface, so that the combination of the graphite felt and the curing felt is facilitated. Meanwhile, the problem of layering of the repair position can be effectively prevented. In addition, the high-pressure gas for flushing cleaning is preferably inert gas, the water content is less than 1ppm, and argon is generally used as the high-pressure gas, and the pressure is 0.03-0.04mpa. And simultaneously, preferably, the graphite felt is manufactured in a multilayer overlapping mode, and the total thickness of the graphite felt is 1.2-1.4 times of that of the damaged and cured felt.
The embodiment of the invention also prepares the bonding material which takes the graphite glue as the main body: the graphite adhesive powder and the organic solvent can be mixed according to a corresponding proportion and then are put into a reaction kettle for fully stirring to obtain the graphite adhesive bonding material. Then, the graphite adhesive bonding material is uniformly coated on the surface of the part to be repaired of the damaged cured felt and the surface of the graphite felt, and the coating amount per unit area is preferably 800-1400 g/m 2 The total thickness is between 0.75 and 1.10mm (for example, the coating amount is between 800 and 900 g/m) 2 And the total thickness is 0.75-0.85 mm; or the coating amount is 1300-1400 g/m 2 And the total thickness is 0.9-1.1 mm). In the embodiment of the invention, the graphite adhesive is a colloidal viscous substance taking graphite as a base material, and the main raw materials are graphite powder and phenolic resin; the organic solvent is preferably absolute ethyl alcohol, and the weight ratio of the graphite glue to the organic solvent can be 1:2 to 4. Wherein, each layer of the graphite felt is coated with the bonding material, and the part to be repaired of the cured felt is required to be completely filled with the graphite felt.
After obtaining the cured felt filled with the graphite felt, the embodiment of the present invention performs cured felt repair lamination: the filled curing felt can be put into laminating equipment for pressing, so that the part to be repaired is completely combined with the graphite felt, and the density of the part to be repaired is improved to reach the density required by the curing felt. AsPreferably, the solid felt is heated to 200 ℃ during lamination, and the first lamination is carried out; then laminating for 4 times by gradually increasing pressure to ensure that the density of the lamination position reaches 0.18-0.25g/cm 3 。
Finally, the embodiment of the invention carries out surface coating preparation and high-temperature treatment. Wherein, the silicon carbide, the graphite powder, the curing agent, the organic silicon resin and the solvent can be stirred and mixed by a reaction kettle, and the weight ratio is preferably 30-40: 20 to 35:10 to 20:40 to 50, further 30:25:10:40:40, or 40; the coating material is obtained after all the raw materials are uniformly mixed. The curing agent can be polyamide, the organic silicon resin is silicon-containing polyvinyl chloride resin, and the solvent is absolute ethyl alcohol and/or acetone.
According to the embodiment of the invention, the spraying equipment can be utilized to uniformly spray the prepared coating material on the surface of the laminated curing felt to obtain the sprayed curing felt; and then, putting the sprayed curing felt into a vacuum furnace, heating to 190-200 ℃ for curing, preferably introducing 60slpm protective gas, and controlling the furnace pressure to 1300kpa to prevent oxidation. Heating and solidifying for 2-3h, taking out, naturally cooling, and cooling for later use; and then carrying out secondary spraying, after the spraying is finished, calcining and curing at the high temperature of 400-410 ℃ for 6-8h, and cooling to obtain the repaired curing felt.
The embodiment of the invention also provides a coating manufacturing method, which can repair the damage of the coating on the surface of the cured felt and is beneficial to prolonging the service life. In the coating, polyamide accelerates the rapid curing of graphite powder, silicon carbide and an organic solvent; and the graphite powder and the silicon carbide increase the adhesive force through the organic silicon resin, the organic solvent is added to adjust the viscosity, and the graphite powder and the silicon carbide are coated on the surface of the solid felt. In addition, the graphite felt is carbonized through high-temperature calcination to form a protective layer, and the protective layer mainly plays a role in relieving pulverization caused by thermal shock in the using process of the graphite felt.
At present, the pulverization failure mode of the curing felt is mainly that the opening part is radiated by heat of a heating element, the laminated and bonded curing felt is corroded and pulverized along with the increase of the using time, and the heat loss is greatly increased after pulverization. According to the repairing scheme provided by the embodiment of the invention, the graphite soft felt leftover materials are mainly nested in the pulverized part for bonding, laminating and the like, the mode is vertical to the laminating direction, the repairing part is an integral repairing block, the combination is good, the cracking is not easy, the heat radiation in the vertical direction is radial and low, the corrosion rate of the radial heat radiation is reduced by adopting the mode, and the conditions that the corrosion rate is high, the service life is short and the like in the recycling process of the solidified felt are overcome.
In order to better understand the technical content of the invention, specific examples are provided below to further illustrate the method for recycling the cured felt provided by the invention.
In the following examples, the main raw materials of the graphite powder body are graphite powder and phenolic resin; the curing agent is polyamide, and the organic silicon resin is silicon-containing polyvinyl chloride, which are all sold in the market.
Example 1
Cutting the abnormal part of the locally pulverized solid felt, completely cutting the pulverized hardened part, then flushing the cured felt by using high-pressure gas (argon, the pressure is 0.03-0.04 mpa), and blowing off fiber scraps with broken surfaces to obtain the cleaned damaged cured felt.
And manufacturing the graphite felt with the same size according to the size of the cutting part of the cured felt, wherein the manufacturing thickness is determined according to the size of the soft felt to be repaired, meanwhile, the soft felt is manufactured in a multi-layer overlapping mode, and the total thickness of the soft felt is 1.2 times of the thickness of the damaged cured felt. The density of the cured felt is 0.20g/cm 3 The density of the graphite felt is 0.1-0.12g/cm 3 。
Mixing graphite adhesive powder and absolute ethyl alcohol according to a weight ratio of 1. The bonding material is uniformly coated on the surface of the part to be repaired of the cured felt and the surface of the graphite soft felt, and the coating amount is 800-900 g/m 2 The thickness is between 0.75 and 0.85mm; and (3) brushing a bonding material on each layer of the graphite soft felt, and completely filling the part to be repaired of the solid felt.
Pressing the filled solid felt in a laminating device, heating the solid felt to 200 ℃ during laminating, performing first laminating, and then gradually increasing the pressure for laminating for 4 times to ensure that the density of the laminated position reaches 0.18-0.25g/cm 3 。
Stirring and mixing silicon carbide, graphite powder, a curing agent, organic silicon resin and an organic solvent through a reaction kettle, wherein the weight ratio of the silicon carbide to the graphite powder to the organic silicon resin is 30:25:10:40: and 40, uniformly mixing to obtain the coating material. And uniformly spraying the coating material on the surface of the laminated curing felt by using spraying equipment to obtain the sprayed curing felt, then putting the sprayed curing felt into a vacuum furnace, heating to 200 ℃ for curing, introducing 60slpm protective gas, and controlling the furnace pressure to 1300kpa. Heating and solidifying for 2-3h, taking out, naturally cooling, and cooling for later use; and then carrying out secondary spraying, calcining at the high temperature of 400 ℃ for 6-8h after the spraying is finished, and cooling to obtain the repaired solidified felt.
Example 2
Cutting the abnormal part of the locally pulverized solid felt, completely cutting the pulverized hardened part, then flushing the cured felt by using high-pressure gas (argon, the pressure is 0.03-0.04 mpa), and blowing off fiber scraps with broken surfaces to obtain the cleaned damaged cured felt.
And manufacturing the graphite felt with the same size according to the size of the cutting part of the cured felt, wherein the manufacturing thickness is determined according to the size of the soft felt to be repaired, meanwhile, the soft felt is manufactured in a multi-layer stacking mode, and the total thickness is 1.4 times of the thickness of the damaged cured felt. The density of the cured felt is 0.22g/cm 3 The density of the graphite felt is 0.1-0.12g/cm 3 。
Mixing graphite adhesive powder and absolute ethyl alcohol according to a weight ratio of 1. Uniformly coating the bonding material on the surface of a part to be repaired of a cured felt and the surface of a graphite soft felt with a coating amount of 800-900 g/m 2 The thickness is between 0.75 and 0.85mm; and (3) coating an adhesive material on each layer of the graphite soft felt, and completely filling the part to be repaired of the solid felt.
Pressing the filled solid felt in a laminating device, heating the solid felt to 200 ℃ during laminating, performing first laminating, and then gradually increasing the pressure for laminating for 4 times to ensure that the density of the laminated position reaches 0.18-0.25g/cm 3 。
Stirring and mixing silicon carbide, graphite powder, a curing agent, organic silicon resin and an organic solvent through a reaction kettle, wherein the weight ratio of the silicon carbide to the graphite powder to the curing agent to the organic silicon resin to the organic solvent is 30:25:10:40: and 40, uniformly mixing to obtain the coating material. And uniformly spraying the coating material on the surface of the laminated curing felt by using spraying equipment to obtain the sprayed curing felt, then putting the sprayed curing felt into a vacuum furnace, heating to 200 ℃ for curing, introducing 60slpm protective gas, and controlling the furnace pressure to 1300kpa. Heating and solidifying for 2-3h, taking out, naturally cooling, and cooling for later use; and then carrying out secondary spraying, calcining at the high temperature of 400 ℃ for 6-8h after the spraying is finished, and cooling to obtain the repaired curing felt.
Example 3
Cutting the abnormal part of the locally pulverized solid felt, completely cutting the pulverized hardened part, then flushing the cured felt by using high-pressure gas (argon, the pressure is 0.03-0.04 mpa), and blowing off fiber scraps with broken surfaces to obtain the cleaned damaged cured felt.
And manufacturing the graphite felt with the same size according to the size of the cutting part of the cured felt, wherein the manufacturing thickness is determined according to the size of the soft felt to be repaired, meanwhile, the soft felt is manufactured in a multi-layer stacking mode, and the total thickness is 1.4 times of the thickness of the damaged cured felt. The density of the cured felt is 0.22g/cm 3 The density of the graphite felt is 0.1-0.12g/cm 3 。
Mixing graphite adhesive powder and absolute ethyl alcohol according to a weight ratio of 1. The bonding material is uniformly coated on the surface of the part to be repaired of the cured felt and the surface of the graphite soft felt, and the coating amount is 1200-1400 g/m 2 The thickness is between 0.95 and 1.1 mm; and (3) brushing a bonding material on each layer of the graphite soft felt, and completely filling the part to be repaired of the solid felt.
Pressing the filled solid felt in a laminating device, heating the solid felt to 200 ℃ during laminating, performing first laminating, and then gradually increasing the pressure for laminating for 4 times to ensure that the density of the laminated position reaches 0.18-0.25g/cm 3 。
Stirring and mixing silicon carbide, graphite powder, a curing agent, organic silicon resin and an organic solvent through a reaction kettle, wherein the weight ratio of the silicon carbide to the graphite powder to the curing agent is 40:35:20:50:50, and uniformly mixing to obtain the coating material. And uniformly spraying the coating material on the surface of the laminated curing felt by using spraying equipment to obtain the sprayed curing felt, then putting the sprayed curing felt into a vacuum furnace, heating to 200 ℃ for curing, introducing 60slpm protective gas, and controlling the furnace pressure to 1300kpa. Heating and solidifying for 2-3h, taking out, naturally cooling, and cooling for later use; and then carrying out secondary spraying, calcining at the high temperature of 400 ℃ for 6-8h after the spraying is finished, and cooling to obtain the repaired curing felt.
The cured felts of examples 1-3 after repair were subjected to technical index testing, and the actual use effects are shown in table 1:
TABLE 1 index results for cured mats of inventive examples 1-3 that were reconditioned
| High temperature resistant effect | Bonding effect | Density of cured felt | Service life |
| The use temperature is 1500 DEG C | No shedding after 150 times of recycling | 0.20g/cm 3 | More than 150 times |
| The use temperature is 1500 DEG C | 170 times of recycling without falling off | 0.22g/cm 3 | More than 170 times |
| The use temperature is 1500 DEG C | Fall off after 120 times of cyclic use | 0.22g/cm 3 | <120 times of |
According to the embodiment, the graphite felt is used for filling, and the graphite glue bonding material is coated on the graphite felt for lamination, so that the repaired graphite felt is combined with the cured felt; through high-temperature calcination treatment and surface coating material spraying, the situations that the inside of the cured felt is corroded by silicon vapor and broken fibers of the cured felt are scattered to the outside can be prevented, and the coating material and the cured felt have good adhesion. The relevant technological indexes of the repaired solidified felt meet the use requirements; when the thermal field application is subjected to the condition of circulating temperature rise, the falling-off condition can not occur, and the service life of the curing felt is effectively prolonged. The invention can effectively reduce the use cost and is beneficial to industrial large-scale popularization.
The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts of the present invention. It should be noted that there are no specific structures but rather a few limitations to the preferred embodiments of the present invention, and that many modifications, adaptations, and variations are possible and can be made by one skilled in the art without departing from the principles of the present invention; such modifications, variations, combinations, or adaptations of the invention using its spirit and scope, as defined by the claims, may be directed to other uses and embodiments.
Claims (10)
1. A method of recycling a cured mat, comprising the steps of:
s1) processing abnormal parts of the damaged and cured felt to form parts to be repaired with suede, and providing a graphite felt with the same area as the abnormal parts, wherein the thickness of the graphite felt is larger than that of the damaged and cured felt;
s2) coating the graphite adhesive bonding material to enable the part to be repaired of the damaged and cured felt to be completely filled with the graphite felt;
s3) laminating and pressing the cured felt filled with the graphite felt to ensure that the part to be repaired is completely combined with the graphite felt and has integrally consistent density;
and S4) carrying out high-temperature treatment on the laminated and pressed curing felt composite coating to obtain a repaired curing felt, wherein the coating comprises the raw materials of silicon carbide, graphite powder, a curing agent and organic silicon resin.
2. The method for recycling the cured felt according to claim 1, wherein in the step S1), the treatment of the abnormal part of the damaged cured felt is specifically as follows: and cutting the abnormal part of the damaged curing felt, then flushing the curing felt by using high-pressure gas, and blowing off fiber scraps with fractured surfaces to obtain the cleaned damaged curing felt.
3. The method of recycling cured mats according to claim 2, wherein in step S1), the high pressure gas used for the scouring cleaning is an inert gas and has a moisture content of less than 1ppm.
4. The method for recycling the cured felt according to claim 1, wherein in the step S1), the graphite felt is manufactured in a multi-layer overlapping mode, and the total thickness of the graphite felt is 1.2-1.4 times of that of the damaged cured felt.
5. The method for recycling the cured felt according to claim 1, wherein in the step S2), the graphite adhesive bonding material is obtained by mixing graphite adhesive and an organic solvent, and the graphite adhesive bonding material is coated on the surface of the portion, to be repaired, of the damaged cured felt and the surface of the graphite felt, so that the graphite felt is completely filled in the portion, to be repaired, of the damaged cured felt.
6. The method of recycling cured mats according to claim 5, wherein in step S2), the cured mats are recycledThe organic solvent is absolute ethyl alcohol, and the coating amount of the graphite adhesive bonding material is 800-1400 g/m 2 The thickness is between 0.75 and 1.10 mm.
7. The method of recycling the cured mat according to claim 1, wherein in step S3), the lamination press is performed to a density of 0.18 to 0.25g/cm 3 。
8. The method for recycling the cured felt according to claim 1, wherein in the step S4), the weight ratio of the silicon carbide, the graphite powder, the curing agent and the organic silicon resin is 30-40: 20 to 35:10 to 20:40 to 50.
9. The method for recycling the cured felt according to claim 8, wherein in the step S4), the coating material is sprayed on the surface of the cured felt after lamination and pressing, and is heated and cured under a vacuum condition, and then the secondary spraying of the coating material is carried out, and the cured felt after repair is obtained after calcination and curing.
10. The method for recycling the cured felt according to claim 9, wherein in the step S4), the temperature for heating and curing is 190-210 ℃ and the time is 2-3 h; the temperature of the calcination and solidification is 390 to 410 ℃, and the time is 6 to 8 hours.
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