Polyimide fibrofelt prepreg

Abstract

The utility model discloses a polyimide fiber felt prepreg which comprises a polyimide fiber felt layer (1) and thermosetting resin adhesive film layers (2) on the two sides of the polyimide fiber felt layer (1), and the thermosetting resin adhesive film layers (2) are combined with the polyimide fiber felt layer (1) in a hot rolling mode. The gram weight of the polyimide fiber felt prepreg is 15g / m < 2 >-200g / m < 2 >. A composite material product obtained by processing the fiber prepreg has the excellent performances of light weight, high temperature resistance, radiation resistance, flame retardance and the like, and can be widely applied to the fields of military products such as aerospace, naval vessels, ships, automobiles, medical instruments and the like, civil products and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of high-performance fibers, and particularly relates to a polyimide prepreg. Background Technique

[0002] In recent years, with the iterative upgrading of modern industries such as new aerospace vehicles, national defense and military industries, marine industries, automobile manufacturing, new energy, and sports equipment, there is an urgent need for materials with high specific strength, high specific modulus, corrosion resistance, high temperature resistance, impact resistance, fracture resistance, fatigue resistance, and high strength and light weight. This undoubtedly provides a broad application market and development potential for high-performance fiber-reinforced resin-based composites.

[0003] The existing sound insulation technology adopts the double-resonance cavity method (for example, CN113700159A, a high-temperature resistant sound insulation board), or the method of adding damping felt (for example, CN110685367A, a sound insulation board). The latest technology cites a composite material sound insulation board (for example, CN113715417A, a composite material sound insulation board). Among them, the sound insulation damping felt is compounded on the surface of the wooden board through an adhesive, and the main component of the sound insulation damping felt is EPDM. Chinese Patent Application CN109534839A discloses a preparation method of a carbon fiber composite material sound insulation board, which uses a composite board prepared from short carbon fiber cuttings, and has the advantages of good waterproof, fireproof, anti-aging, and impact resistance capabilities, low energy consumption in material use, environmental protection, and no pollution to the environment after being discarded.

[0004] The existing fiber mat prepregs include carbon fiber mat prepregs (for example, CN209869447U, a carbon fiber mat composite glass fiber knitted mat prepreg; CN111073218A, an environmentally friendly flame-retardant short carbon fiber mat prepreg and its preparation method). The addition of the carbon fiber mat prepreg reduces the weight of the subsequent composite board. In addition, Chinese Patent Application CN113801439A discloses a surface mat prepreg and its preparation method, in which polyester fiber mat and acrylonitrile fiber mat are introduced and compounded with epoxy resin to form a fiber mat prepreg.

[0005] Chinese Patent Document CN104130548A discloses a polyimide fiber prepreg, its preparation method and application. The polyimide fiber prepreg contains 40-80% by weight of polyimide fibers and 20-60% by weight of resin. The polyimide fiber prepreg provided by this invention uses polyimide long fibers or their fabrics as reinforcing fibers and is prepared by impregnating with cyanate ester resin, epoxy resin, bismaleimide or benzoxazine resin, etc.

[0006] Existing fiber mat prepregs have disadvantages such as insufficient heat resistance, high weight, and insufficient fire protection rating. In addition, existing polyimide fiber prepregs use polyimide long fibers or their fabrics as reinforcing fibers, and there is still room for improvement in weight reduction, high temperature resistance, and coating and composite processing properties. Furthermore, polyimide fiber mat prepregs are not disclosed in the prior art. Summary of the Utility Model

[0007] Aiming at the deficiencies in the prior art, the purpose of the present utility model is to provide a polyimide fiber mat prepreg, which can fill the gaps in the prior art, and compared with the existing polyimide fiber prepregs, it can be improved in at least one aspect of weight reduction, high temperature resistance, and coating and composite processing properties.

[0008] Another purpose of the present utility model is to provide a preparation method for the above polyimide fiber mat prepreg.

[0009] Still another purpose of the present utility model is to provide a composite material including the above polyimide fiber mat prepreg.

[0010] According to the purpose of the present utility model, the present utility model provides a polyimide fiber mat prepreg, which includes a polyimide fiber mat layer (1) and resin film layers (2) on both sides thereof. The resin film layers (2) are combined with the polyimide fiber mat layer (1) by means of hot roll pressing; the grammage of the polyimide fiber mat prepreg is 15 g / m 2 ~200 g / m 2 .

[0011] In the present utility model, polyimide fiber mats are used to improve the heat resistance of resin reinforcements, and at the same time, a new type of polyimide fiber mat prepreg is provided, which is lighter in weight and more heat-resistant compared with the existing polyimide fiber prepregs.

[0012] In the present utility model, the resin can be one or more high-temperature thermosetting resins such as epoxy resin, bismaleimide resin, and cyanate ester resin. Preferably, it can be modified by adding a modifying substance containing groups such as ester bonds, ether bonds, imidazole, cyanamide, amino groups, and urea, which can ensure the flame retardant performance on the one hand and improve the processability of the resin and extend the storage period of the resin on the other hand.

[0013] In addition, the grammage of the polyimide fiber mat prepreg prepared in the present utility model can be achieved at 15~200 g / m 2 , preferably 15~100 g / m 2 , more preferably 15~80 g / m 2 , further preferably 15~40 g / m 2 .

[0014] Preferably, the polyimide fiber felt prepreg further comprises a release paper layer (3) and a PE film layer (4) coated on the outer side of the resin film layer (2).

[0015] Preferably, the thickness of the resin film layer (2) is 10 μm to 30 μm.

[0016] Preferably, the polyimide fiber felt prepreg contains 20 to 80% by weight of polyimide fiber felt and 20 to 80% by weight of thermosetting resin.

[0017] In the present utility model, the gram weight of the polyimide fiber felt used is selected according to actual needs, and it can be 10 g / m 2 ~100 g / m 2 , and for better achieving the purpose of weight reduction, it is preferably 10 g / m 2 ~40 g / m 2 , and more preferably 10 g / m 2 ~35 g / m 2 .

[0018] According to the present utility model, by using polyimide fiber felt to prepare prepreg, the production of polyimide prepreg with lower gram weight can be realized. Since the gram weight of the polyimide fiber felt can be controlled to 10 - 35 g / m 2 , therefore, according to the type of resin used, the gram weight of the polyimide fiber felt prepreg can be controlled to 15 - 40 g / m 2 .

[0019] The thermosetting resin can be selected from at least one of modified bismaleimide resin, modified epoxy resin, and modified cyanate ester resin, preferably modified bismaleimide resin or modified epoxy resin, and more preferably modified bismaleimide resin.

[0020] According to the present utility model, by using modified bismaleimide resin to prepare prepreg, the production of polyimide prepreg with better processability can be realized, and the coating and composite process temperature can be achieved between 80 - 120 °C, and the heat resistance can reach 260 °C.

[0021] According to the present utility model, by using modified epoxy resin to prepare prepreg, the production of polyimide prepreg with better processability can be realized, and the coating and composite process temperature can be achieved between 80 - 120 °C, and the heat resistance can reach 200 °C.

[0022] In the preferred embodiment of the present utility model, the modified bismaleimide resin is a product obtained by heating and stirring 10 parts by weight of diallyl bisphenol A epoxy, 4.2 parts by weight of methylimidazole, 1 part by weight of dicyandiamide, and 100 parts by weight of bismaleimide resin at 120 °C; and / or

[0023] The modified epoxy resin is a product obtained by heating and stirring 100 parts by weight of a high-temperature epoxy resin, 10 parts by weight of an aminophenol tetrafunctional epoxy resin, 4.2 parts by weight of methylimidazole, and 3 parts by weight of urea at 100°C.

[0024] By using the above-mentioned modified bismaleimide resin or modified epoxy resin, the processability of the resin can be improved without affecting the heat resistance, which is beneficial to the production operation of prepregs.

[0025] In the present utility model, the fiber mat can be a mixture of various fibers. For example, a mixed mat of polyimide and aramid fiber, a mixed mat of polyimide and polyphenylene sulfide (PPS), a mixed mat of polyimide and carbon fiber, etc. Thus, the polyimide fiber mat can be changed to a mixed mat of polyimide fiber and aramid fiber, a mixed mat of polyimide fiber and polyphenylene sulfide fiber, or a mixed mat of polyimide and carbon fiber.

[0026] Another object of the present utility model is to provide a method for preparing a polyimide fiber mat prepreg, which includes the following processes:

[0027] 1) Coating process: The resin is subjected to coating processing to obtain a resin film; 2) Composite process: The resin film is subjected to hot roll pressing composite processing with the polyimide fiber mat to obtain a polyimide fiber mat prepreg.

[0028] Preferably, the resin is a modified bismaleimide resin or a modified epoxy resin. In process 1), the resin is taken for heat treatment to obtain a flowing resin, and the molten resin is evenly coated on the release paper by using a film laminator and covered with a PE film to obtain a resin film roll; in process 2), a polyimide fiber mat is taken and compounded with two resin films prepared in process 1) under the action of a hot pressing roller; the temperature of the coating process and the composite process is between 80 and 120°C.

[0029] Still another object of the present utility model is to provide a composite material, which is prepared from the above-mentioned polyimide fiber mat prepreg.

[0030] The polyimide fiber mat prepreg and the composite material of the present utility model can be widely applied to the fields of military products or civilian products, and the fields of military products and civilian products include aerospace, naval ships, automobiles, sports equipment, and medical devices, such as sound insulation boards, etc.

[0031] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0032] (1) Using the polyimide fiber mat to improve the heat resistance of the reinforcement, and at the same time providing a new type of polyimide fiber mat prepreg;

[0033] (2) Compared with the existing polyimide fiber prepregs, the gram weight (areal density) of the polyimide fiber felt prepregs prepared by the present utility model can be achieved at 15 - 200 g / m 2 , with a lighter weight, and can bring obvious effects in the fields of high temperature resistance and weight reduction;

[0034] (3) The resin adopts one or more high-temperature resistant resins such as epoxy resin, bismaleimide resin, polyimide resin, and cyanate ester resin, and is modified. On the one hand, it ensures the flame retardant performance, and on the other hand, it improves the processability of the resin. The coating and composite process temperatures can be achieved between 80 - 120 °C, and the temperature resistance can reach above 200 °C. Description of the Drawings

[0035] Figure 1 It is a schematic structural diagram of the polyimide fiber felt prepregs of the present utility model.

[0036] The markings in the above-mentioned drawings are as follows: polyimide fiber felt layer 1, resin film layer 2, release paper layer 3, PE film layer 4. Detailed Embodiments

[0037] The following will further illustrate the present utility model in conjunction with specific embodiments, but the present utility model is not limited to the following embodiments. For those conditions not specified in the embodiments, they are carried out according to the conventional conditions or the conditions recommended by the manufacturer. For the reagents or instruments whose manufacturers are not specified, they are all conventional products that can be obtained through commercial purchase.

[0038] In the present utility model, regarding "parts", unless otherwise specified, it refers to parts by weight. In addition, for the endpoints and any values within the ranges disclosed in the present utility model, they are not limited to the exact ranges or values. These ranges or values should be understood to include values close to these ranges or values. For numerical ranges, between the endpoint values of each range, between the endpoint values of each range and individual point values, and between individual point values, they can be combined with each other to obtain one or more new numerical ranges, and these numerical ranges should be regarded as specifically disclosed in the present utility model.

[0039] In the following examples and comparative examples:

[0040] The polyimide fiber felt is from Jiangsu Xiannuo New Material Technology Co., Ltd., with a gram weight of 10 g / m 2 ;

[0041] The continuous polyimide fabric is from Jiangsu Xiannuo New Material Technology Co., Ltd., with a gram weight of 40 g / m 2 ;

[0042] The bismaleimide resin is purchased from Honghu Bismaleimide New Material Technology Co., Ltd., and the high-temperature epoxy is purchased from Nanyang Wanshixing Chemical Industry.

[0043] The grammage test method complies with GB / T 32788.6 (Test methods for prepreg properties - Part 6: Determination of mass per unit area), and the resin content test method complies with GB / T 32788.5 (Test methods for prepreg properties - Part 5: Determination of resin content).

[0044] Preparation Examples 1 to 2 are used to prepare modified bis - maleimide resin or modified epoxy resin.

[0045] Preparation Example 1: Preparation of modified bis - maleimide resin

[0046] 10 parts of diallyl bisphenol A epoxy, 4.2 parts by weight of methylimidazole, 1 part of dicyandiamide and 100 parts of bis - maleimide resin are heated and stirred at 120 °C to obtain modified bis - maleimide resin A.

[0047] Preparation Example 2: Preparation of modified epoxy resin

[0048] 100 parts by weight of high - temperature epoxy (the main components are succinic anhydride epoxy derivative and isophthalic anhydride), 10 parts by weight of aminophenol tetra - functional epoxy (as a high - temperature diluent), 4.2 parts by weight of methylimidazole, and 3 parts by weight of urea are heated and stirred at 100 °C to obtain modified epoxy resin B.

[0049] Examples 1 to 4 are used to illustrate the preparation of polyimide fiber mat prepreg. The structure of the prepared polyimide fiber mat prepreg is as Figure 1 shown.

[0050] Example 1:

[0051] For the preparation method of polyimide fiber mat prepreg, a two - step hot - melt method is adopted. First, a modified bis - maleimide resin is used for coating, and then it is used for the composite process. In the coating process, 1000 g of modified bis - maleimide resin A is heat - treated at 90 °C to obtain a flow - state bis - maleimide resin. The molten resin is evenly coated on the release paper using a film laminator, and then a PE film is covered on the upper surface of the resin to obtain a resin film roll with a thickness of 10 μm.

[0052] In the composite process, a fiber mat product with a weight of 10 g / m 2 is successively passed through a tension rod, a flattening rod, etc. and is compounded with the film under the action of a hot - press roller. Finally, at the prepreg winding position, the upper - layer release paper layer is removed by an upper paper - receiving device, and a PE film is covered, etc. Among them, the modified bis - maleimide resin A modifies the bis - maleimide resin phase, and improves the process performance of the resin without affecting the heat resistance, which is beneficial to the operation of prepreg production.

[0053] The prepreg prepared under this condition has a grammage of 17 g / m 2, the resin mass fraction in the prepreg is 40%, the film coating temperature of the resin is reduced to 80 °C, the composite temperature is 100 °C, and the curing temperature is 180 - 200 °C. The polyimide sheet prepared from this prepreg can withstand temperatures up to 260 °C.

[0054] Example 2:

[0055] Compared with Example 1, by changing the gram weight of the adhesive film, the production of polyimide fiber felt prepregs with different resin contents can be achieved.

[0056] The two-step hot melting method is adopted for the preparation method of the polyimide fiber felt prepreg. First, the modified bismaleimide resin is used for film coating and then for the composite process. In the film coating process, 3000 g of modified bismaleimide resin A is heat-treated at 90 °C to obtain a flowable bismaleimide resin. The molten resin is evenly coated on the release paper using a film laminator, and then a PE film is covered on the upper surface of the resin to obtain a resin adhesive film with a thickness of 30 μm.

[0057] In the composite process, a fiber felt product with a weight of 10 g / m 2 passes through a tension rod, a flattening rod, etc. and is composite with the adhesive film under the action of a hot pressing roller. Among them, the modified bismaleimide resin A improves the process performance of the resin without affecting the temperature resistance, which is beneficial to the operation of prepreg production.

[0058] The prepreg prepared under these conditions has a gram weight of 50 g / m 2 , the resin mass fraction in the prepreg is 80%, the film coating temperature of the resin is reduced to 80 °C, the composite temperature is 100 °C, and the curing temperature is 180 - 200 °C. The polyimide sheet prepared from this prepreg can withstand temperatures up to 260 °C.

[0059] Example 3:

[0060] Compared with Example 1, by changing the gram weight of the fiber felt, the production of polyimide fiber felt prepregs with different gram weights can be achieved.

[0061] The two-step hot melting method is adopted for the preparation method of the polyimide fiber felt prepreg. First, the modified bismaleimide resin is used for film coating and then for the composite process. In the film coating process, 1000 g of modified bismaleimide resin A is heat-treated at 90 °C to obtain a flowable bismaleimide resin. The molten resin is evenly coated on the release paper using a film laminator, and then a PE film is covered on the upper surface of the resin to obtain a resin adhesive film with a thickness of 10 μm.

[0062] In the composite process, with 100 g / m 2The fiber felt product passes through a tension rod, a flattening rod, etc. in sequence and is compounded with a glue film under the action of a hot pressing roller. Among them, the modified bismaleimide resin A improves the process performance of the resin without affecting the heat resistance by modifying the bismaleimide resin phase, which is beneficial to the operation of prepreg production.

[0063] The prepreg prepared under this condition has a grammage of 200 g / m 2 , the resin mass fraction in the prepreg is 50%, the coating temperature of the resin is reduced to 80 °C, the compounding temperature is 100 °C, and the curing temperature is 180 - 200 °C. The polyimide sheet prepared from this prepreg can withstand a temperature of up to 260 °C.

[0064] Example 4:

[0065] Comparing Example 4 with Example 1, by changing the resin formula, the production of polyimide fiber felt prepregs with different resin formulas can be achieved.

[0066] For the preparation method of the polyimide fiber felt prepreg, the two-step hot melting method is adopted. First, the modified epoxy resin is used for coating, and then it is used for the compounding process. In the coating process, 1000 g of the modified epoxy resin B is heat-treated at 80 °C to obtain a flowing epoxy resin. The molten resin is evenly coated on the release paper using a film laminator, and then a PE film is covered on the upper surface of the resin to obtain a resin glue film with a thickness of 10 μm.

[0067] In the compounding process, a fiber felt product with a weight of 10 g / m 2 passes through a tension rod, a flattening rod, etc. in sequence and is compounded with the glue film under the action of a hot pressing roller. Among them, the modified epoxy resin B improves the process performance of the resin by modifying the epoxy resin without affecting the heat resistance.

[0068] The prepreg prepared under this condition has a grammage of 17 g / m 2 , the resin mass fraction in the prepreg is 40%, the coating temperature of the resin is reduced to 80 °C, the compounding temperature is 100 °C, and the curing temperature is 160 - 180 °C. The polyimide sheet prepared from this prepreg can withstand a temperature of up to 200 °C.

[0069] Example 5:

[0070] For the preparation method of the prepreg of the mixed felt of polyimide fiber and aramid fiber, the two-step hot melting method is adopted. First, the modified bismaleimide resin is used for coating, and then it is used for the compounding process. In the coating process, 1000 g of the modified bismaleimide resin A is heat-treated at 90 °C to obtain a flowing bismaleimide resin. The molten resin is evenly coated on the release paper using a film laminator, and then a PE film is covered on the upper surface of the resin to obtain a resin glue film roll with a thickness of 10 μm.

[0071] In the composite process, a mixed fiber felt product of 10 g / m 2 (where aramid fiber accounts for 20 parts by weight and polyimide fiber accounts for 80 parts by weight) is successively passed through a tension rod, a flattening rod, etc. and is compounded with a film under the action of a hot pressing roller. Finally, at the prepreg winding position, the upper release paper layer is removed by an upper paper collecting device, and a PE film is covered, etc. Among them, the modified bismaleimide resin A improves the process performance of the resin without affecting the heat resistance by modifying the bismaleimide resin phase, which is beneficial to the production operation of the prepreg.

[0072] The prepreg prepared under this condition has a gram weight of 17 g / m 2 , the mass fraction of the resin in the prepreg is 40%, the coating temperature of the resin is reduced to 80 °C, the composite temperature is 100 °C, and the curing temperature is 180 - 200 °C. The polyimide board prepared from this prepreg can withstand a temperature of up to 240 °C.

[0073] Example 6:

[0074] For the preparation method of the mixed felt prepreg of polyimide fiber and PPS fiber, the two-step hot melting method is adopted. First, the modified bismaleimide resin is used for coating, and then it is used for the composite process. In the coating process, 1000 g of the modified bismaleimide resin A is heat-treated at 90 °C to obtain a flowing bismaleimide resin. The molten resin is evenly coated on the release paper using a film coater, and then a PE film is covered on the upper surface of the resin to obtain a resin film roll with a thickness of 10 μm.

[0075] In the composite process, a mixed fiber felt product of 10 g / m 2 (where PPS fiber accounts for 60 parts by weight and polyimide fiber accounts for 40 parts by weight) is successively passed through a tension rod, a flattening rod, etc. and is compounded with a film under the action of a hot pressing roller. Finally, at the prepreg winding position, the upper release paper layer is removed by an upper paper collecting device, and a PE film is covered, etc. Among them, the modified bismaleimide resin A improves the process performance of the resin without affecting the heat resistance by modifying the bismaleimide resin phase, which is beneficial to the production operation of the prepreg.

[0076] The prepreg prepared under this condition has a gram weight of 17 g / m 2 , the mass fraction of the resin in the prepreg is 40%, the coating temperature of the resin is reduced to 80 °C, the composite temperature is 100 °C, and the curing temperature is 180 - 200 °C. The polyimide board prepared from this prepreg can withstand a temperature of up to 260 °C.

[0077] Example 7:

[0078] The preparation method of the hybrid felt prepreg of polyimide fiber and carbon fiber adopts a two-step hot melting method. First, a modified bismaleimide resin is used for film coating and then for the composite process. In the film coating process, 1000 g of modified bismaleimide resin A is heat-treated at 90 °C to obtain a flowable bismaleimide resin. The molten resin is evenly coated on the release paper using a film laminator, and then a PE film is covered on the upper surface of the resin to obtain a resin film roll with a thickness of 10 μm.

[0079] In the composite process, a hybrid fiber felt product with 10 g / m 2 (where carbon fiber accounts for 10 parts by weight and polyimide fiber accounts for 90 parts by weight) passes through a tension rod, a flattening rod, etc. and is laminated with the film under the action of a hot pressing roller. Finally, at the prepreg winding position, the upper release paper layer is removed by an upper paper collecting device, and a PE film is covered, etc. Among them, the modified bismaleimide resin A improves the processability of the resin without affecting the heat resistance, which is beneficial to the production operation of the prepreg.

[0080] The prepreg prepared under these conditions has a grammage of 17 g / m 2 . The resin mass fraction in the prepreg is 40%, the film coating temperature of the resin is reduced to 80 °C, the composite temperature is 100 °C, and the curing temperature is 180 - 200 °C. The polyimide sheet prepared from this prepreg can withstand a temperature of up to 260 °C.

[0081] According to actual needs, the film coating temperature and the composite temperature in the above Examples 1 - 7 can be adjusted between 80 - 120 °C. In addition, the mixing ratio of different fibers in the hybrid fiber felt used in Examples 5 - 7 can be adjusted according to actual needs, not limited to the above examples.

[0082] Comparative Example 1:

[0083] The polyimide fiber felt is changed to polyimide fabric (grammage 40 g / m 2 ). Except for this, the preparation process is the same as that of Example 1, and a polyimide fabric prepreg is prepared. The grammage of this prepreg is 50 g / m 2 .

[0084] Comparative Example 2:

[0085] The bismaleimide resin A is changed to bismaleimide resin. Except for this, the preparation process is the same as that of Example 1, and a polyimide fiber felt prepreg is prepared. When using bismaleimide resin, the processability is poor, the film coating temperature is 150 °C, and the composite temperature is 170 °C, which is not conducive to the production operation of the prepreg. Moreover, the heat resistance of the polyimide sheet prepared from this prepreg is lower than 250 °C.

[0086] Comparative Example 3:

[0087] The epoxy resin B was changed to a high-temperature epoxy resin. Except for this, the preparation process was the same as that of Example 4, and a polyimide fiber felt prepreg was prepared. When using a high-temperature epoxy resin, the processability was poor, the film coating temperature was 130 °C, and the composite temperature was 150 °C, which was not conducive to the production operation of the prepreg. Moreover, the temperature resistance of the polyimide sheet prepared from this prepreg was lower than 190 °C.

[0088] From the comparison between the above Example 1 and Comparative Example 1, it can be seen that by using a polyimide fiber felt to prepare a prepreg, the production of a polyimide prepreg with a lower gram weight can be achieved. Since the gram weight of the polyimide fiber felt can be controlled to be 10 - 35 g / m 2 , therefore, according to the type of resin used, the gram weight of the polyimide fiber felt prepreg can be controlled to be 15 - 40 g / m 2 .

[0089] From the comparison between the above Example 1 and Comparative Example 2, it can be seen that by using a modified bismaleimide resin to prepare a prepreg, the production of a polyimide prepreg with better processability can be achieved, and the film coating and composite process temperatures can be achieved between 80 - 120 °C, and the temperature resistance can reach 260 °C.

[0090] From the comparison between the above Example 4 and Comparative Example 3, it can be seen that by using a modified epoxy resin to prepare a prepreg, the production of a polyimide prepreg with better processability can be achieved, and the film coating and composite process temperatures can be achieved between 80 - 120 °C, and the temperature resistance can reach 200 °C.

[0091] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these changes and modifications.

Claims

1. A polyimide fiber felt prepreg, characterized in that, It includes a polyimide fiber felt layer (1) and resin adhesive film layers (2) on both sides thereof. The resin adhesive film layer (2) is combined with the polyimide fiber felt layer (1) by means of hot roll pressing; the grammage of the polyimide fiber felt prepreg is 15 g / m 2 ~200 g / m 2 ; the thickness of the resin adhesive film layer (2) is 10 μm~30 μm.

2. The polyimide fiber felt prepreg according to claim 1, wherein The polyimide fiber felt prepreg further includes a release paper layer (3) and a PE film layer (4) coated on the outer side of the resin film layer (2).

3. The polyimide fiber felt prepreg according to claim 1, wherein, The polyimide fiber felt prepreg contains 20-80% by weight of polyimide fiber felt and 20-80% by weight of thermosetting resin; and / or The thermosetting resin is selected from at least one of modified bismaleimide resin, modified epoxy resin, and modified cyanate resin; and / or The grammage of the polyimide fiber felt is 10 g / m 2 ~100 g / m 2 .

4. The polyimide fiber felt prepreg according to claim 3, wherein, The grammage of the polyimide fiber felt prepreg is 15 to 100 g / m 2 ; and / or The grammage of the polyimide fiber felt is 10 g / m 2 to 40 g / m 2 .

5. The polyimide fiber felt prepreg according to claim 4, wherein, The gram weight of the polyimide fiber felt prepreg is 15 to 80 g / m 2 ; and / or The grammage of the polyimide fiber felt is 10 g / m 2 to 35 g / m 2 .

6. The polyimide fiber felt prepreg according to claim 5, wherein The grammage of the polyimide fiber felt prepreg is 15 to 40 g / m 2 .

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