Carbon fiber thermal insulation felt reinforced membrane layer and carbon fiber thermal insulation felt containing the same

Abstract

The present invention provides a carbon fiber thermal insulation felt reinforced film layer and a carbon fiber thermal insulation felt containing the same, and relates to the technical field of thermal insulation materials. The carbon fiber thermal insulation felt reinforced film layer is mainly prepared from carbon fiber filaments and a reinforcing solution; the carbon fiber filaments are asphalt-based carbon fiber filaments; the reinforcing solution includes strength reinforcing materials, thermal stability materials, curing agents, dispersants and solvents; wherein the strength reinforcing materials include at least one of silicon dioxide, aluminum oxide and silicon nitride; the thermal stability materials include at least one of zirconium oxide and cubic boron nitride. The carbon fiber thermal insulation felt reinforced film layer prepared from the above materials in the present application has the technical advantages of low thermal conductivity, high surface strength, and can be used in a high-pressure thermal field environment, effectively alleviating the problem that the existing carbon fiber thermal insulation felt cannot be used in a high-pressure environment.

Description

Technical Field

[0001] The invention relates to the technical field of heat insulation materials, and in particular to a carbon fiber insulation felt reinforced film layer and a carbon fiber insulation felt comprising the same. Background Art

[0002] Among the existing various materials of thermal insulation materials, carbon fiber thermal insulation felt has become the key thermal insulation material developed today because of its high strength, high modulus, high dimensional stability, low density, small thermal expansion coefficient, thermal shock resistance, ablation resistance, good oxidation resistance, etc. For example, the prior art such as publication number CN114645376A discloses a preparation method of low-density carbon fiber rigid thermal insulation felt, which has low density and excellent thermal insulation performance, thermal shock resistance and thermal stability.

[0003] However, in actual use, carbon fiber insulation felt often needs to be used in a high-pressure environment (high-pressure and high-temperature furnace) with a pressure greater than 30 MPa. However, in a hot field environment with a pressure exceeding 30 MPa, ordinary carbon fiber insulation felt will be squeezed and deformed due to the high pressure, which will lead to a decrease in strength and fail to achieve the effect of thermal insulation.

[0004] Therefore, in order to address the problem that existing carbon fiber thermal insulation felts cannot be used in high-pressure environments, it has become necessary and urgent to research and develop a carbon fiber thermal insulation felt that has low thermal conductivity, high surface strength, can be used in high-pressure thermal field environments, and does not require modification of the carbon fiber filaments.

[0005] In view of this, the present invention is proposed. Summary of the invention

[0006] The first purpose of the present invention is to provide a carbon fiber thermal insulation felt reinforced membrane layer, which has the technical advantages of low thermal conductivity, high surface strength, and can be used in a high-pressure thermal field environment, effectively alleviating the problem that the existing carbon fiber thermal insulation felt cannot be used in a high-pressure environment.

[0007] A second object of the present invention is to provide a carbon fiber thermal insulation felt having the above-mentioned carbon fiber thermal insulation felt reinforced membrane layer.

[0008] The third object of the present invention is to provide a method for preparing carbon fiber thermal insulation felt.

[0009] In order to achieve the above-mentioned purpose of the present invention, the following technical solutions are particularly adopted:

[0010] The present invention provides a carbon fiber thermal insulation felt reinforced membrane layer, wherein the carbon fiber thermal insulation felt reinforced membrane layer is mainly prepared from carbon fiber filaments and a reinforcing solution;

[0011] The carbon fiber filaments are asphalt-based carbon fiber filaments;

[0012] The strengthening solution comprises: a strength strengthening material, a thermal stability material, a curing agent, a dispersant and a solvent;

[0013] Wherein, the strength enhancing material includes at least one of silicon dioxide, aluminum oxide and silicon nitride; the thermal stability material includes at least one of zirconium oxide and cubic boron nitride.

[0014] Furthermore, the curing agent is powdered phenolic resin;

[0015] Furthermore, the dispersant is methyl cellulose or polyvinyl alcohol;

[0016] Furthermore, the solvent is pure water.

[0017] Furthermore, the enhancement solution also includes: carbon nanotubes, 3-methacrylatepropyltrimethoxysilane or polycarbonate.

[0018] Furthermore, the enhanced solution comprises, by mass percentage:

[0019] Strength enhancing material 10~45%, thermal stability material 5~15%, curing agent 10~30%, dispersant 1~5%, carbon nanotube 0~8%, 3-methacrylate propyl trimethoxy silane 0~4%, polycarbonate 0~15% and solvent 10~55%;

[0020] The sum of the mass percentages of the components in the enhanced solution is 100%.

[0021] Furthermore, the enhanced solution comprises, by mass percentage:

[0022] 20-40% silicon dioxide, 5-15% zirconium oxide, 2-8% carbon nanotubes, 15-30% powdered phenolic resin, 1-4% methyl cellulose, and 10-55% pure water; the sum of the mass percentages of the components in the enhanced solution is 100%;

[0023] Preferably, the enhanced solution comprises, by mass percentage:

[0024] Silica 30%, zirconium oxide 10%, carbon nanotubes 5%, powdered phenolic resin 25%, methyl cellulose 2.5% and pure water 27.5%.

[0025] Furthermore, the carbon fiber filaments are asphalt-based carbon fiber filaments chopped into a length of 25 mm.

[0026] Furthermore, the mass ratio of the carbon fiber filaments to the reinforcing solution in the carbon fiber thermal insulation felt reinforced membrane layer is 1:4-8, preferably 1:6.

[0027] The present invention provides a carbon fiber thermal insulation felt, which comprises: a thermal insulation felt base material and a reinforcing film layer attached to the thermal insulation felt base material;

[0028] The reinforced membrane layer is the above-mentioned carbon fiber thermal insulation felt reinforced membrane layer.

[0029] The present invention provides a method for preparing a carbon fiber thermal insulation felt, the method comprising:

[0030] (A) stirring and mixing the raw materials for preparing the enhanced solution and placing them in a container to obtain the enhanced solution;

[0031] (B) spreading carbon fiber filaments on the surface of the reinforcing solution in a 0 degree direction, and then contacting the surface of the thermal insulation felt substrate to be reinforced with the solution to form a surface, so that the carbon fiber filaments and the reinforcing solution are attached to the thermal insulation felt substrate; and then heating and curing to obtain a carbon fiber thermal insulation felt with an intermediate film layer;

[0032] The thickness of the intermediate film layer is 0.5-2 mm;

[0033] (C) Repeat step (B) by successively increasing the carbon fiber scattering angle until the film thickness on the thermal insulation felt substrate is 4 to 10 mm, and remove impurities at high temperature to obtain a carbon fiber thermal insulation felt.

[0034] Furthermore, the temperature of heating and curing in step (B) is 180-240°C, preferably 210°C;

[0035] Furthermore, in step (C), the carbon fiber splaying angle is increased in sequence as follows: the carbon fiber angle is 0 degrees for the first time, 45 degrees for the second time, 90 degrees for the third time, and so on;

[0036] Furthermore, the temperature of high-temperature impurity removal in step (C) is 1500-2000°C, preferably 1800°C.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] The carbon fiber thermal insulation felt reinforcement film layer provided by the present invention is mainly prepared from carbon fiber filaments and reinforcement solution; the carbon fiber filaments are asphalt-based carbon fiber filaments; the reinforcement solution includes: strength-enhancing materials, thermal stability materials, curing agents, dispersants and solvents; wherein the strength-enhancing materials include at least one of silicon dioxide, aluminum oxide and silicon nitride; the thermal stability materials include at least one of zirconium oxide and cubic boron nitride. The carbon fiber thermal insulation felt reinforcement film layer prepared from the above materials in the present application has the technical advantages of low thermal conductivity, high surface strength, and can be used in high-pressure thermal field environments, effectively alleviating the problem that existing carbon fiber thermal insulation felts cannot be used in high-pressure environments.

[0039] The present invention provides a method for preparing a carbon fiber thermal insulation felt. The method first spreads the carbon fiber filaments on the surface of the reinforcing solution in a 0-degree direction, then brings the surface of the thermal insulation felt substrate to be reinforced into contact with the solution, and after heating and curing, obtains a carbon fiber thermal insulation felt having an intermediate film layer with a thickness of 0.5 to 2 mm; further, the present invention repeats the above intermediate film layer preparation steps until the film layer thickness is 4 to 10 mm in a manner of sequentially increasing the spreading angle of the carbon fiber filaments, thereby obtaining a carbon fiber thermal insulation felt. The method for preparing the carbon fiber thermal insulation felt of the present invention can obtain a thermal insulation felt with low thermal conductivity and high surface strength without modifying the carbon fiber, and has the technical advantage of a simple processing technology. At the same time, after the surface reinforcement film layer of the carbon fiber thermal insulation felt of the present invention is lost, the surface reinforcement film layer can be re-prepared, which effectively extends the service life of the carbon fiber thermal insulation felt and reduces the cost. DETAILED DESCRIPTION

[0040] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] According to one aspect of the present invention, a carbon fiber thermal insulation felt reinforced membrane layer is provided, wherein the carbon fiber thermal insulation felt reinforced membrane layer is mainly prepared from carbon fiber filaments and a reinforcing solution;

[0042] The carbon fiber filaments are asphalt-based carbon fiber filaments;

[0043] The strengthening solution comprises: a strength strengthening material, a thermal stability material, a curing agent, a dispersant and a solvent;

[0044] Wherein, the strength enhancing material includes at least one of silicon dioxide, aluminum oxide and silicon nitride; the thermal stability material includes at least one of zirconium oxide and cubic boron nitride.

[0045] The carbon fiber thermal insulation felt reinforcement film layer provided by the present invention is mainly prepared from carbon fiber filaments and reinforcement solution; the carbon fiber filaments are asphalt-based carbon fiber filaments; the reinforcement solution includes: strength-enhancing materials, thermal stability materials, curing agents, dispersants and solvents; wherein the strength-enhancing materials include at least one of silicon dioxide, aluminum oxide and silicon nitride; the thermal stability materials include at least one of zirconium oxide and cubic boron nitride. The carbon fiber thermal insulation felt reinforcement film layer prepared from the above materials in the present application has the technical advantages of low thermal conductivity, high surface strength, and can be used in high-pressure thermal field environments, effectively alleviating the problem that existing carbon fiber thermal insulation felts cannot be used in high-pressure environments.

[0046] Specifically, the strength-enhancing material includes at least one of silicon dioxide, aluminum oxide and silicon nitride, wherein silicon dioxide and silicon nitride can effectively increase the surface strength of the film layer; aluminum oxide can increase the surface strength and increase the thermal shock stability. The thermal stability material includes at least one of zirconium oxide and cubic boron nitride. Zirconium oxide and cubic boron nitride can increase the thermal stability of the film layer, thereby ensuring that the film layer will not have abnormal phenomena such as cracking at high temperatures.

[0047] In a preferred embodiment of the present invention, the curing agent is a powdered phenolic resin;

[0048] In a preferred embodiment of the present invention, the dispersant is methyl cellulose or polyvinyl alcohol;

[0049] In a preferred embodiment of the present invention, the solvent is pure water.

[0050] In a preferred embodiment of the present invention, the enhancement solution further comprises: carbon nanotubes, 3-methacrylatepropyltrimethoxysilane or polycarbonate.

[0051] As a preferred embodiment, the above-mentioned enhancement solution may also include carbon nanotubes, 3-methacrylate propyl trimethoxy silane or polycarbonate. Among them: carbon nanotubes can effectively reduce the thermal conductivity of the film layer; 3-methacrylate propyl trimethoxy silane (MPS) can increase the compatibility between interfaces; polycarbonate can improve the impact resistance of the film layer.

[0052] In a preferred embodiment of the present invention, the strengthening solution comprises, by mass percentage, 10-45% of strength strengthening material, 5-15% of thermal stability material, 10-30% of curing agent, 1-5% of dispersant, 0-8% of carbon nanotubes, 0-4% of 3-methacrylate propyltrimethoxysilane, 0-15% of polycarbonate and 10-55% of solvent;

[0053] The sum of the mass percentages of the components in the enhanced solution is 100%.

[0054] In the above preferred embodiment, the enhancement solution comprises, by mass percentage, 20-40% silicon dioxide, 5-15% zirconium oxide, 2-8% carbon nanotubes, 15-30% powdered phenolic resin, 1-4% methyl cellulose, and 10-55% pure water; the sum of the mass percentages of the components in the enhancement solution is 100%;

[0055] In the present invention, the effect of the enhanced solution of the present invention is further optimized by further adjusting and optimizing the usage ratio of the raw materials of each component in the enhanced solution.

[0056] Preferably, the reinforcing solution comprises, by mass percentage, 30% silicon dioxide, 10% zirconium oxide, 5% carbon nanotubes, 25% powdered phenolic resin, 2.5% methyl cellulose and 27.5% pure water.

[0057] In a preferred embodiment of the present invention, the carbon fiber filaments are asphalt-based carbon fiber filaments chopped into a length of 25 mm.

[0058] As a preferred embodiment, the asphalt-based carbon fiber filaments of the above-mentioned size have a better effect in preparing the reinforced membrane layer. The asphalt-based carbon fiber filaments with a length longer than 25 mm are not easy to prepare a solution, while the asphalt-based carbon fiber filaments with a length shorter than this length have insufficient strength.

[0059] In a preferred embodiment of the present invention, the mass ratio of the carbon fiber filaments to the reinforcing solution in the carbon fiber thermal insulation felt reinforcement film layer is 1:4-8, preferably 1:6.

[0060] As a preferred embodiment, the mass ratio of carbon fiber filaments and reinforcing solution in the above-mentioned carbon fiber insulation felt reinforced film layer is 1:4~8. A mass ratio higher than this will cause the film layer thickness to increase, the thermal conductivity of the felt body to increase, and the thermal insulation performance to decrease. A ratio lower than this will not be able to obtain the desired compressive strength.

[0061] According to one aspect of the present invention, a carbon fiber thermal insulation felt comprises: a thermal insulation felt substrate and a reinforcing film layer attached to the thermal insulation felt substrate;

[0062] The reinforced membrane layer is the above-mentioned carbon fiber thermal insulation felt reinforced membrane layer.

[0063] According to one aspect of the present invention, a method for preparing a carbon fiber thermal insulation felt comprises:

[0064] (A) stirring and mixing the raw materials for preparing the enhanced solution and placing them in a container to obtain the enhanced solution;

[0065] (B) spreading carbon fiber filaments on the surface of the reinforcing solution in a 0 degree direction, and then contacting the surface of the thermal insulation felt substrate to be reinforced with the solution to form a surface, so that the carbon fiber filaments and the reinforcing solution are attached to the thermal insulation felt substrate; and then heating and curing to obtain a carbon fiber thermal insulation felt with an intermediate film layer;

[0066] The thickness of the intermediate film layer is 0.5-2 mm;

[0067] (C) Repeat step (B) by successively increasing the carbon fiber scattering angle until the film thickness on the thermal insulation felt substrate is 4 to 10 mm, and remove impurities at high temperature to obtain a carbon fiber thermal insulation felt.

[0068] The present invention provides a method for preparing a carbon fiber thermal insulation felt, the preparation method comprising: first spreading the carbon fiber filaments on the surface of a reinforcing solution in a 0 degree direction, then contacting the surface of the thermal insulation felt substrate to be reinforced with the solution to form a surface, and after heating and curing, obtaining a carbon fiber thermal insulation felt having an intermediate film layer with a thickness of 0.5 to 2 mm; further, the present invention repeats the above intermediate film layer preparation steps until the film layer thickness is 4 to 10 mm in a manner of sequentially increasing the spreading angle of the carbon fiber filaments, thereby obtaining a carbon fiber thermal insulation felt. The preparation method of the carbon fiber thermal insulation felt of the present invention can obtain a thermal insulation felt with low thermal conductivity and high surface strength without modifying the carbon fiber, and has the technical advantage of a simple processing technology. At the same time, after the surface reinforcement film layer of the carbon fiber thermal insulation felt of the present invention is lost, the surface reinforcement film layer can be re-prepared, which effectively prolongs the service life of the carbon fiber thermal insulation felt and reduces the cost.

[0069] In a preferred embodiment of the present invention, the temperature of heating and curing in step (B) is 180-240°C, preferably 210°C;

[0070] In a preferred embodiment of the present invention, the step (C) sequentially increases the carbon fiber splay angle in the following manner: the first carbon fiber angle is 0 degrees, the second is 45 degrees, the third is 90 degrees, and so on;

[0071] In a preferred embodiment of the present invention, the temperature of high temperature impurity removal in step (C) is 1500-2000°C, preferably 1800°C.

[0072] The technical solution of the present invention will be further described below in conjunction with embodiments.

[0073] Note: The following examples and comparative examples use the carbon fiber rigid thermal insulation felt prepared in Example 1 of CN114645376A as the thermal insulation felt matrix to illustrate the performance of the carbon fiber thermal insulation felt reinforced film layer of the present application.

[0074] Embodiment 1~3

[0075] A method for preparing carbon fiber thermal insulation felt, the method comprising:

[0076] 1. Provide the carbon fiber hard insulation felt prepared in Example 1 of CN114645376A as the insulation felt substrate;

[0077] 2. Grind and polish the surface of the thermal insulation felt substrate that needs to be strengthened to make its surface flatness less than 1mm;

[0078] 3. Preparation of surface enhancement solution: The raw material composition of the surface enhancement solution of Examples 1 to 3 is shown in Table 1.

[0079] Table 1:

[0080]

[0081] 4. The asphalt-based carbon fiber filaments chopped into 25 mm length are opened by a carding machine, and the directionality is kept uniform before opening, so as to obtain carbon fiber filaments with only one direction after opening.

[0082] Note: This application has no special restrictions on the source of asphalt-based carbon fiber filaments, and asphalt-based carbon fiber filament products known to those skilled in the art can be used, such as commercially available products. The asphalt-based carbon fiber filaments used in each embodiment of this application are KRECA brand carbon fibers.

[0083] 5. Mix all the raw materials in step 3 and stir for 15 minutes, then pour them into a mold with a thickness of 1 mm. The length and width of the mold are set according to the length and width of the required enhanced product. Stick high-temperature cloth in the mold to facilitate demolding after enhancement.

[0084] 6. Spread the carbon filaments on the surface of the reinforcement solution at 0 degrees, with the weight ratio of carbon filaments to solution being 1:6. After standing for 15 minutes, place the surface of the product to be reinforced on the mold in contact with the solution, and put it in an oven for heating and curing. The curing temperature is 210°C.

[0085] 7. Repeat step 6, except that the first carbon wire angle is 0 degrees, the second is 45 degrees, the third is 90 degrees, and so on. That is, the coating thickness increases by 1mm each time, and the operation is repeated after curing each time. The finished film thickness is 7mm.

[0086] 8. The membrane-reinforced product is placed in a 1800°C high-temperature graphitization furnace to remove impurities and obtain carbon fiber insulation felt.

[0087] Example 4

[0088] This embodiment is the same as Embodiment 1 except that in step 4, "asphalt-based carbon fiber filaments chopped into a length of 25 mm" is replaced by "asphalt-based carbon fiber filaments chopped into a length of 40 mm".

[0089] Example 5

[0090] This embodiment is the same as Embodiment 1 except that in step 4, "asphalt-based carbon fiber filaments chopped into a length of 25 mm" is replaced by "asphalt-based carbon fiber filaments chopped into a length of 10 mm".

[0091] Example 6

[0092] This embodiment is the same as Embodiment 1 except that in step 6, "the weight ratio of the carbon filament to the solution is 1:6" is replaced by "the weight ratio of the carbon filament to the solution is 1:8".

[0093] Example 7

[0094] This embodiment is the same as Embodiment 1 except that in step 6, "the weight ratio of the carbon filament to the solution is 1:6" is replaced by "the weight ratio of the carbon filament to the solution is 1:4".

[0095] Example 8

[0096] In this embodiment, except that step 7 is changed to: "Repeat the operation of step 6, the difference is that the carbon filament angle is 0 degree for the first time, 45 degrees for the second time, 90 degrees for the third time, and so on, that is, the coating thickness increases by 2mm each time, and the operation is repeated after curing each time. The finished film layer thickness reaches 7mm.", the rest is the same as embodiment 1.

[0097] Example 9

[0098] In this embodiment, except that step 7 is changed to: "Repeat the operation of step 6, the difference is that the carbon filament angle is 0 degree for the first time, 45 degrees for the second time, 90 degrees for the third time, and so on, that is, the coating thickness increases by 0.5mm each time, and the operation is repeated after curing each time. The finished film layer thickness reaches 7mm.", the rest is the same as embodiment 1.

[0099] Example 10

[0100] In this embodiment, except that step 7 is changed to: "Repeat the operation of step 6, the difference is that the carbon filament angle is 0 degree for the first time, 45 degrees for the second time, 90 degrees for the third time, and so on, that is, the coating thickness increases by 1mm each time, and the operation is repeated after curing each time. The finished film layer thickness reaches 10mm.", the rest is the same as embodiment 1.

[0101] Embodiment 11

[0102] In this embodiment, except that step 7 is changed to: "Repeat the operation of step 6, the difference is that the carbon filament angle is 0 degree for the first time, 45 degrees for the second time, 90 degrees for the third time, and so on, that is, the coating thickness increases by 1mm each time, and the operation is repeated after curing each time. The finished film layer thickness reaches 4mm.", the rest is the same as embodiment 1.

[0103] Example 12

[0104] In this embodiment, the raw material composition of the surface enhancement solution in step 3 is the same as that of embodiment 1, except that the raw material composition of the surface enhancement solution in step 3 is: "30% aluminum oxide, 15% cubic boron nitride, 2% 3-methacrylatepropyltrimethoxysilane (MPS), 4% carbon nanotubes, 25% powdered phenolic resin, 20% pure water and 4% polyvinyl alcohol".

[0105] Embodiment 13

[0106] This embodiment is the same as Embodiment 1 except that the raw material composition of the surface enhancement solution in Step 3 is: "15% silicon nitride, 15% aluminum oxide, 10% polycarbonate, 7% cubic boron nitride, 3% polyvinyl alcohol, 20% powdered phenolic resin, and 30% pure water".

[0107] Embodiment 14

[0108] This embodiment is the same as embodiment 1 except that the raw material composition of the surface enhancement solution in step 3 is: "30% aluminum oxide, 10% zirconium oxide, 5% carbon nanotubes, 25% powdered phenolic resin, 2.5% methyl cellulose and 27.5% pure water".

[0109] This embodiment is the same as Embodiment 1 except that “silicon dioxide” is replaced by “aluminum oxide”.

[0110] Embodiment 15

[0111] This embodiment is the same as embodiment 1 except that the raw material composition of the surface enhancement solution in step 3 is: "30% silicon dioxide, 10% cubic boron nitride, 5% carbon nanotubes, 25% powdered phenolic resin, 2.5% methyl cellulose and 27.5% pure water".

[0112] This embodiment is the same as Embodiment 1 except that “zirconium oxide” is replaced by “cubic boron nitride”.

[0113] Example 16

[0114] This embodiment is the same as embodiment 1 except that the raw material composition of the surface enhancement solution in step 3 is: "30% silicon dioxide, 10% zirconium oxide, 30% powdered phenolic resin, 2.5% methyl cellulose and 27.5% pure water".

[0115] This embodiment is the same as Embodiment 1 except that the “carbon nanotubes” are replaced with “an equal amount of powdered phenolic resin”.

[0116] Test Example 1

[0117] In order to show that the carbon fiber thermal insulation felt prepared in the present application has the technical advantages of low thermal conductivity, high surface strength and can be used in a high-pressure thermal field environment, the carbon fiber thermal insulation felt prepared in Examples 1 to 16 is subjected to performance testing, and the carbon fiber hard thermal insulation felt prepared in Example 1 in CN114645376A is used as a control group to compare the effects.

[0118] Testing method: The compression strength is tested using the GB / T 1041-2008 method, and the thermal conductivity is tested using the GB / T3139-2005 method. See Table 2 for specific test results.

[0119] Table 2:

[0120]

[0121] From the results in the above table, it can be seen that the carbon fiber thermal insulation felts prepared in Examples 1 to 13 of the present application have the technical advantages of low thermal conductivity and high surface strength compared to the control group. Among them, the thermal insulation felt prepared in Example 1 has the best technical effect. After the surface of the thermal insulation felt substrate is enhanced, the compression strength can reach >30 MPa and the thermal insulation performance is similar to that of ordinary thermal insulation felt.

[0122] The performance of Example 9 is similar to that of Example 1, but the number of enhanced cycles in Example 1 is 7 times, while the number of enhanced cycles in Example 9 is 14 times, so Example 1 is simpler to operate than Example 9.

[0123] Compared with Examples 1 to 3, Example 12 has similar thermal insulation performance after the surface of the thermal insulation felt substrate is enhanced, but the compressive strength fails to meet the preset requirements.

[0124] Compared with Examples 1 to 3, Example 13 has a higher compression strength after the surface of the thermal insulation felt substrate is enhanced, but the thermal insulation performance is much lower than that of ordinary thermal insulation felt.

[0125] In Example 14, compared with Example 1, the compressive strength is reduced after "silicon dioxide" is replaced by "alumina", and the thermal insulation performance remains unchanged, which indicates that the choice of "silicon dioxide" in the reinforcing solution is significantly better than alumina in improving the compressive strength.

[0126] In Example 15, compared with Example 1, "zirconium oxide" is replaced with "cubic boron nitride", and the compressive strength is improved, but the thermal insulation performance is relatively reduced.

[0127] Compared with Example 1, Example 16, which does not include the implementation method of "carbon nanotubes", has poor compression strength and thermal insulation performance.

[0128] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A carbon fiber thermal insulation felt reinforced membrane layer, characterized in that: The carbon fiber thermal insulation felt reinforcement film layer is mainly prepared from carbon fiber filaments and a reinforcement solution; The reinforcing solution comprises, by mass percentage, 30-40% silicon dioxide, 10-15% zirconium oxide, 5-8% carbon nanotubes, 20-25% powdered phenolic resin, 2-2.5% methyl cellulose, and 15-27.5% pure water; the sum of the mass percentages of the components in the reinforcing solution is 100%; The carbon fiber filaments are asphalt-based carbon fiber filaments chopped to a length of 25 mm; The mass ratio of carbon fiber filaments to reinforcing solution in the carbon fiber thermal insulation felt reinforced film layer is 1:

6.

2. The carbon fiber thermal insulation felt reinforced membrane layer according to claim 1, characterized in that: The enhanced solution comprises, by mass percentage: Silica 30%, zirconium oxide 10%, carbon nanotubes 5%, powdered phenolic resin 25%, methyl cellulose 2.5% and pure water 27.5%.

3. A carbon fiber thermal insulation felt, characterized in that: The carbon fiber thermal insulation felt comprises: a thermal insulation felt base material and a reinforcing film layer attached to the thermal insulation felt base material; The reinforced membrane layer is the carbon fiber thermal insulation felt reinforced membrane layer as described in claim 1 or 2.

4. A method for preparing the carbon fiber thermal insulation felt according to claim 3, characterized in that: The preparation method comprises: (A) stirring and mixing the raw materials for preparing the enhanced solution and placing them in a container to obtain the enhanced solution; (B) spreading carbon fiber filaments on the surface of the reinforcing solution in a 0 degree direction, and then contacting the surface of the thermal insulation felt substrate to be reinforced with the solution to form a surface, so that the carbon fiber filaments and the reinforcing solution are attached to the thermal insulation felt substrate; and then heating and curing to obtain a carbon fiber thermal insulation felt with an intermediate film layer; The thickness of the intermediate film layer is 0.5-2 mm; (C) Repeat step (B) by successively increasing the carbon fiber scattering angle until the film thickness on the thermal insulation felt substrate is 4 to 10 mm, and remove impurities at high temperature to obtain a carbon fiber thermal insulation felt.

5. The method for preparing the carbon fiber thermal insulation felt according to claim 4, characterized in that: The temperature of heating and curing in step (B) is 180-240°C.

6. The method for preparing the carbon fiber thermal insulation felt according to claim 5, characterized in that: The temperature of heating and curing in step (B) is 210°C.

7. The method for preparing the carbon fiber thermal insulation felt according to claim 4, characterized in that: The step (C) increases the carbon fiber scattering angle in sequence in the following manner: the first carbon fiber scattering angle is 0 degrees, the second is 45 degrees, the third is 90 degrees, and so on.

8. The method for preparing the carbon fiber thermal insulation felt according to claim 4, characterized in that: The temperature of the high-temperature impurity removal in step (C) is 1500-2000°C.

9. The method for preparing the carbon fiber thermal insulation felt according to claim 8, characterized in that: The temperature of high-temperature impurity removal in step (C) is 1800°C.

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