Integrated molding and simplified preparation process of high-speed impact resistant carbon fiber / resin composite material based on prefabricated interlayer toughening structure

Abstract

The invention relates to the technical field of carbon fiber reinforced resin-based composite materials, in particular to a prefabricated interlayer toughening structure-based high-speed impact resistant carbon fiber / resin composite material integral forming simple preparation process, which comprises the following steps of: placing a prefabricated interlayer toughening structure between adjacent carbon fiber cloth layers coated with phenoxy resin modified epoxy resin glue solution; and finally, carrying out integral hot-press molding. The prefabricated interlayer toughening structure is obtained by impregnating a chopped fiber felt with a phenoxy resin modified epoxy resin glue solution and performing prepolymerization under heating and pressurizing conditions. According to the invention, the chopped fibers are introduced into the interlayers of the carbon fiber / resin composite material in the form of a prefabricated interlayer toughening structure, and the problem that the chopped fibers are not uniformly distributed in the interlayer area can be effectively solved without changing the original preparation process of the composite material. In addition, through the synergistic effect of phenoxy resin and chopped fibers, stress transfer between layers of the carbon fiber / resin composite material can be more uniform and effective, and crack propagation can be delayed through bridging, deflection and other toughening mechanisms.

Description

Technical Field

[0001] The invention relates to the technical field of carbon fiber reinforced resin-based composite materials, and in particular to a streamlined preparation process for one-piece molding of a high-speed impact-resistant carbon fiber / resin composite material based on a prefabricated interlayer toughening structure. Background Art

[0002] Carbon fiber reinforced resin-based composites are widely used as engineering structural materials due to their excellent specific strength, specific modulus, fatigue resistance and corrosion resistance. Compared with isotropic materials such as metals, anisotropic carbon fiber / resin composites only have excellent mechanical properties along the fiber axis, while the mechanical properties in other directions are relatively weak. In addition, as the thermosetting resin of the matrix, the volume reduction during the curing process will lead to internal stress concentration, and the highly cross-linked network structure formed after curing will limit the plastic deformation. Therefore, when carbon fiber / resin composites are impacted, they are prone to cracks, delamination damage and material failure, which seriously restricts the application and development of high-performance carbon fiber composites.

[0003] Improving interlaminar fracture toughness is one of the most effective methods to improve the impact damage resistance of carbon fiber composites. The current strategy is mainly interlaminar toughening. Based on the theory of "controllable interlaminar phase", the toughening component is introduced into the interlaminar of adjacent fibers of carbon fiber composites, which can not only significantly improve the interlaminar fracture toughness of composites, but also retain the molding process performance and in-plane performance of carbon fiber composites. Thermoplastic resins, chopped fibers, etc. are widely used in interlaminar toughening. Introducing thermoplastic resins into the interlaminar in the form of particles, films or nanofibers, or making the chopped fibers uniformly dispersed in the interlaminar can improve the interlaminar fracture toughness of carbon fiber composites. However, processing thermoplastic resins into films or preparing nanofiber mats by electrospinning requires high-temperature processing or auxiliary reagents, which is contrary to the concept of low-carbon and green development. In addition, the feasibility and economy of these methods also face certain challenges in large-scale production. Therefore, it is urgent to develop green, environmentally friendly, suitable for mass production and efficient toughening technologies to further expand the scope and field of application of carbon fiber composites. Summary of the invention

[0004] In order to achieve the toughening technology goal of being green, environmentally friendly, efficient and capable of mass production, the present invention improves the interlaminar fracture toughness of carbon fiber composite materials, thereby further expanding the application scope and field of carbon fiber composite materials. A streamlined preparation process for one-piece molding of high-speed impact-resistant carbon fiber / resin composite materials based on a prefabricated interlaminar toughening structure is provided.

[0005] The present invention is realized by the following technical scheme: a streamlined preparation process for integrated molding of a high-speed impact-resistant carbon fiber / resin composite material based on a prefabricated interlayer toughening structure, wherein the high-speed impact-resistant carbon fiber / resin composite material based on the prefabricated interlayer toughening structure is obtained by placing the prefabricated interlayer toughening structure between layers of adjacent carbon fiber cloths coated with phenoxy resin-modified epoxy resin glue, and finally hot pressing the prefabricated interlayer toughening structure in one piece; the prefabricated interlayer toughening structure is impregnated with a phenoxy resin-modified epoxy resin glue with a surface density of 5 to 50 g / m 2 The chopped fiber mat is obtained by prepolymerizing under heating and pressure conditions.

[0006] As a further improvement of the technical solution of the present invention, the chopped fiber mat is prepared by dispersing the chopped fibers in a cellulose aqueous solution and then filtering and drying them.

[0007] As a further improvement of the technical solution of the present invention, the chopped fibers are selected from any one of chopped carbon fibers, chopped glass fibers, and chopped aramid fibers, or a mixture of several thereof; the diameter of the chopped fibers is 3 to 6 mm, and the length is 5 to 15 mm.

[0008] As a further improvement of the technical solution of the present invention, the phenoxy resin modified epoxy resin glue is obtained by sequentially adding phenoxy resin, curing agent and accelerator into heated epoxy resin and mixing them evenly.

[0009] As a further improvement of the technical solution of the present invention, the epoxy resin is selected from any one of bisphenol A epoxy resin, bisphenol F epoxy resin, and novolac epoxy resin, or a mixture of several of them; the number average molecular weight of the phenoxy resin is 11,000 to 16,000.

[0010] As a further improvement of the technical solution of the present invention, the curing agent is selected from any one of anhydride curing agents and amine curing agents; the accelerator is selected from any one of 2, 4, 6-tris(dimethylaminomethyl)phenol, 2,4,6-tris(aminomethyl)phenol, and N,N-diethyl-3,4,5-trimethylaniline.

[0011] As a further improvement of the technical solution of the present invention, when preparing phenoxy resin modified epoxy resin glue, the mass ratio of phenoxy resin to epoxy resin is 0.05-0.20:1, and the mass ratio of epoxy resin: curing agent: accelerator is 1:0.7-0.9:0.001-0.01.

[0012] As a further improvement of the technical solution of the present invention, when preparing the prefabricated interlayer toughening structure, the time for impregnating the chopped fiber felt with the phenoxy resin modified epoxy resin adhesive is 20 to 60 minutes; the prepolymerization temperature is 60 to 80°C, the prepolymerization pressure is 0.5 to 2MPa, and the prepolymerization time is 30 to 50 minutes.

[0013] As a further improvement of the technical solution of the present invention, the cellulose is selected from any one of methyl cellulose, hydroxyethyl cellulose, and hydroxypropyl cellulose or a mixture of several thereof; the concentration of the cellulose solution is 0.5 to 1.2 g / L; the surface density of the obtained short fiber felt is 5 to 50 g / m 2 .

[0014] As a further improvement of the technical solution of the present invention, the temperature of the integrated hot pressing molding is 100-150°C, the time is 120-300 min, and the pressure is 0-20 MPa.

[0015] The streamlined preparation process of the integrated high-speed impact-resistant carbon fiber / resin composite material based on the prefabricated interlayer toughening structure provided by the present invention has the following advantages compared with the prior art: Compared with the prior art, the present invention has the following beneficial effects: 1) In the preparation process of phenoxy resin modified epoxy resin, chopped fiber mat and carbon fiber / resin composite materials, no harmful reagents are used, the process is simple and easy to operate, and it meets the standards of green safety and mass production, which is of great significance for promoting the practical application of carbon fiber composite products.

[0016] 2) The molecular structure of the selected phenoxy resin is highly similar to that of the epoxy resin. It can be directly dissolved in the epoxy resin under certain temperature conditions without adding a compatibilizer or other auxiliary dispersing agents, and has stable performance. Therefore, it has strong processability.

[0017] 3) The longer molecular chain of phenoxy resin and the large number of ether groups, isopropyl groups and other groups it contains give it a certain toughness. Compared with unmodified epoxy resin, the fracture toughness of phenoxy resin modified epoxy resin can be increased by 70-80%.

[0018] 4) Introducing the chopped fibers into the interlayers of the carbon fiber / resin composite material in the form of a prefabricated interlayer toughening structure effectively solves the problem of uneven distribution of the chopped fibers in the interlayer area. In addition, there is no need to change the original preparation process of the composite material.

[0019] 5) The synergistic effect of phenoxy resin and chopped fibers makes the stress transfer between the layers of carbon fiber / resin composite materials more uniform and effective, and can delay the expansion of cracks through toughening mechanisms such as bridging and deflection. In addition, the high-strength and high-modulus chopped fibers make up for the problem of decreased strength and modulus caused by phenoxy resin modification, thereby achieving the goal of significantly improving interlaminar fracture toughness and impact resistance without reducing the overall mechanical properties of carbon fiber / resin composite materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 The load-time diagrams of the high-speed impact resistant carbon fiber / resin composite material based on the prefabricated interlayer toughening structure prepared in Example 1 and the untoughened carbon fiber / resin composite material prepared in Comparative Example 1 under 40J impact energy.

[0023] Depend on Figure 1 It can be seen that the high-speed impact-resistant carbon fiber / resin composite material based on the prefabricated interlayer toughening structure of the present invention has significantly improved impact damage resistance. DETAILED DESCRIPTION

[0024] In order to more clearly understand the above-mentioned objectives, features and advantages of the present invention, the scheme of the present invention will be further described below. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0025] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present invention, rather than all of the embodiments.

[0026] The present invention provides a specific embodiment of a streamlined preparation process for integrated molding of a high-speed impact-resistant carbon fiber / resin composite material based on a prefabricated interlayer toughening structure, comprising the following steps: (S1) heating the epoxy resin to 130-160° C., adding a phenoxy resin in proportion and mixing evenly; sequentially adding a curing agent and an accelerator in proportion and mixing evenly to obtain a phenoxy resin modified epoxy resin glue; the mass ratio of the phenoxy resin to the epoxy resin is 0.05-0.20:1, and the mass ratio of the epoxy resin: the curing agent: the accelerator is 1:0.7-0.9:0.001-0.01; (S2) preparing a cellulose aqueous solution, adding chopped fibers and dispersing them evenly, pouring them into a sieve, filtering them, and drying them to obtain a chopped fiber mat; (S3) impregnating the chopped fiber mat obtained in step (S2) with the phenoxy resin modified epoxy resin adhesive prepared in step (S1), taking out and removing excess resin adhesive after a certain period of time, heating and prepolymerizing under a certain pressure for a certain period of time to obtain a prefabricated interlayer toughening structure; (S4) laying a layer of carbon fiber cloth and brushing a layer of phenoxy resin modified epoxy resin glue, and placing the prefabricated interlayer toughening structure obtained in step (S3) between the layers of adjacent carbon fiber cloths. After laying, the material is placed in a mold, hot-pressed and demolded to obtain a high-speed impact resistant carbon fiber / resin composite material based on the prefabricated interlayer toughening structure.

[0027] The chopped fibers are selected from any one of chopped carbon fibers, chopped glass fibers, and chopped aramid fibers, or a mixture of the two or more thereof; the diameter of the chopped fibers is 3 to 6 mm, and the length is 5 to 15 mm.

[0028] Furthermore, the phenoxy resin modified epoxy resin has a flexural strength of 110 to 150 MPa and a plane strain fracture toughness K IC-R 1.0~1.4MPa·m 1 / 2 , critical strain energy release rate G IC-R 0.5~0.8 kJ / m².

[0029] In an embodiment provided by the present invention, the carbon fiber cloth is selected from any one or more of unidirectional cloth, biaxial cloth and woven cloth.

[0030] In another embodiment provided by the present invention, the epoxy resin is selected from any one of bisphenol A epoxy resin, bisphenol F epoxy resin, and novolac epoxy resin, or a mixture of several of them; and the number average molecular weight of the phenoxy resin is 11,000 to 16,000.

[0031] In one embodiment provided by the present invention, the curing agent is selected from any one of anhydride curing agents and amine curing agents; the accelerator is selected from any one of 2, 4, 6-tris(dimethylaminomethyl)phenol, 2,4,6-tris(aminomethyl)phenol, and N,N-diethyl-3,4,5-trimethylaniline.

[0032] In another embodiment provided by the present invention, when preparing phenoxy resin modified epoxy resin glue, the mass ratio of phenoxy resin to epoxy resin is 0.05-0.20:1, and the mass ratio of epoxy resin: curing agent: accelerator is 1:0.7-0.9:0.001-0.01.

[0033] In one embodiment provided by the present invention, when preparing the prefabricated interlayer toughening structure, the time for impregnating the chopped fiber felt with the phenoxy resin modified epoxy resin adhesive is 20 to 60 minutes; the prepolymerization temperature is 60 to 80°C, the prepolymerization pressure is 0.5 to 2MPa, and the prepolymerization time is 30 to 50 minutes.

[0034] In another embodiment provided by the present invention, the cellulose is selected from any one of methyl cellulose, hydroxyethyl cellulose, and hydroxypropyl cellulose, or a mixture thereof; the concentration of the cellulose solution is 0.5 to 1.2 g / L; the surface density of the obtained chopped fiber mat is 5 to 50 g / m 2 .

[0035] As a further improvement of the technical solution of the present invention, the temperature of the integrated hot pressing molding is 100-150°C, the time is 120-300 min, and the pressure is 0-20 MPa.

[0036] The specific embodiments of the present invention are described in detail below. Test Characterization:

[0037] According to ASTM D5054-14 "Standard Test Methods for Plane-Strain Fracture Toughness and Strain Energy Release Rate of Plastic Materials", the fracture toughness of phenoxy resin modified epoxy resin was tested, GB / T 2567-08 "Resin Casting Performance Test Scheme" was used to test the flexural strength of phenoxy resin modified epoxy resin, ASTM D7264-15 "Standard Test Method for Flexural Properties of Polymer Metrix Composite Materials" was used to test the flexural properties of carbon fiber / resin composite materials, ASTM D 2344 "Standard Test Method for Short Beam Strength of PolymerMatrix Composite Materials and Their Laminates" was used to test the interlaminar shear strength of carbon fiber / resin composite materials, ASTM D5528-13 "Standard Test Method for Mode l InterlaminarFracture Toughness of Unidirectional Fiber-Reinforced Polymer MatrixComposites" was used to test the interlaminar type I fracture toughness of carbon fiber / resin composite materials, and ASTM D 7136 "Standard test method for measuring the damage resistance of fiber-reinforced polymer matrix composites to drop weight impact events" is used to conduct drop weight impact tests on carbon fiber / resin composites. Example 1

[0038] An integrated streamlined preparation process for a high-speed impact-resistant carbon fiber / resin composite material based on a prefabricated interlayer toughening structure comprises the following steps: (S1) 100 g of bisphenol A epoxy resin (E51) was heated to 150°C, 12 g of phenoxy resin PKHH with a number average molecular weight of 13,000 was added and mixed evenly; 80 g of cis-cyclohexane-1,2-dicarboxylic anhydride (HHPA) preheated at 70°C for 60 min was added and mixed at 90°C for 30 min; 0.54 g of 2,4,6-tris(dimethylaminomethyl)phenol (DMP-30) was added and mixed evenly, and the mixture was defoamed at 90°C and vacuum degree of -0.09 MPa for 10 min to obtain a phenoxy resin modified epoxy resin glue.

[0039] (S2) Prepare 2L of 0.8 g / L hydroxyethyl cellulose aqueous solution, add 1.42g of T300 chopped carbon fiber and disperse evenly, pour into a sieve, filter and dry at 80°C to obtain a surface density of 20g / m 2 Chopped carbon fiber mat.

[0040] (S3) impregnating the chopped carbon fiber felt obtained in step (S2) with the phenoxy resin modified epoxy resin adhesive prepared in step (S1), taking out and removing excess resin adhesive after 30 minutes, and then prepolymerizing at 1 MPa and 70° C. for 30 minutes to obtain a prefabricated interlayer toughening structure; (S4) cutting 12 sheets of 180×180 mm T700 unidirectional carbon fiber cloth and laying them orthogonally; laying a layer of carbon fiber cloth and brushing a layer of phenoxy resin modified epoxy resin glue prepared in step (S1), and placing the prefabricated interlayer toughening structure obtained in step (S3) between the layers of adjacent carbon fiber cloths, and after laying, placing the entire material into a mold, hot pressing and molding it as a whole under the conditions of 100°C / 45min+140°C / 120min / 15MPa, and then demolding to obtain a high-speed impact resistant carbon fiber / resin composite material based on the prefabricated interlayer toughening structure.

[0041] The carbon fiber / resin composite material prepared in this embodiment has a bending strength of 891 MPa, an interlaminar shear strength of 51 MPa, and an interlaminar type I critical strain energy release rate G IC-C 1.5 kJ / m 2 , the peak impact load is 11 kN. Comparative Example 1

[0042] A preparation process of a carbon fiber / resin composite material comprises the following steps: (S1) is the same as (S1) in Example 1; (S2) is the same as (S4) in Example 1, except that no prefabricated interlayer toughening structure is placed between adjacent carbon fiber cloth layers.

[0043] The carbon fiber / resin composite material prepared in this comparative example has a flexural strength of 903 MPa, an interlaminar shear strength of 30 MPa, and an interlaminar type I critical strain energy release rate G IC-C 0.8 kJ / m 2 , the peak impact load is 8.5 kN. Example 2

[0044] The same as Example 1, except that in step (S4), 12 sheets of 200×200 mm T700 unidirectional carbon fiber cloth are cut and laid.

[0045] The carbon fiber / resin composite material prepared in this embodiment has a bending strength of 887 MPa, an interlaminar shear strength of 49 MPa, and an interlaminar type I critical strain energy release rate G IC-C 1.4 kJ / m 2 , the peak impact load is 10 kN. Comparative Example 2

[0046] The same as the comparative example 1, except that in step (S2), 12 sheets of 200×200 mm T700 unidirectional carbon fiber cloth are cut and laid.

[0047] The carbon fiber / resin composite material prepared in this comparative example has a flexural strength of 900 MPa, an interlaminar shear strength of 31 MPa, and an interlaminar type I critical strain energy release rate G IC-C 0.9 kJ / m 2 , the peak impact load is 9 kN.

[0048] By comparison, it can be seen that the high-speed impact-resistant carbon fiber / resin composite material based on the prefabricated interlaminar toughening structure prepared by the process of the present invention can improve the interlaminar fracture toughness of the carbon fiber / resin composite material without substantially sacrificing the bending strength, thereby improving the impact resistance. Example 3

[0049] A process for preparing a phenoxy resin modified epoxy resin comprises the following steps: (S1) 100 g of bisphenol A epoxy resin (E51) was heated to 150°C, 4 g of phenoxy resin PKHH was added and mixed evenly; 80 g of HHPA preheated at 70°C for 60 min was added and mixed at 90°C for 30 min; 0.54 g of DMP-30 was added and mixed evenly, and defoamed at 90°C and vacuum degree of -0.09 MPa for 10 min.

[0050] (S2) Pour the prepared resin glue into a mold, and obtain a phenoxy resin modified epoxy resin after curing. The curing process is 100°C / 45min+140°C / 120min.

[0051] The phenoxy resin modified epoxy resin prepared in this embodiment has a flexural strength of 110 MPa and a plane strain fracture toughness K IC-R 1.1MPa·m 1 / 2 , critical strain energy release rate G IC-R It is 0.7kJ / m². Example 4

[0052] Exactly the same as Example 3, except that the amount of PKHH added is 8 g.

[0053] The phenoxy resin modified epoxy resin prepared in this embodiment has a flexural strength of 115 MPa and a plane strain fracture toughness K IC-R 1.2MPa·m 1 / 2 , critical strain energy release rate G IC-R It is 0.7kJ / m². Example 5

[0054] Exactly the same as Example 4, except that the amount of PKHH added was 12 g.

[0055] The phenoxy resin modified epoxy resin prepared in this embodiment has a flexural strength of 131 MPa and a plane strain fracture toughness K IC-R 1.4MPa·m 1 / 2 , critical strain energy release rate G IC-R It is 0.8kJ / m². Example 6

[0056] Exactly the same as Example 4, except that the amount of PKHH added was 16 g.

[0057] The phenoxy resin modified epoxy resin prepared in this embodiment has a flexural strength of 121 MPa and a plane strain fracture toughness K IC-R 1.2MPa·m 1 / 2 , critical strain energy release rate G IC-R It is 0.7kJ / m². Comparative Example 3

[0058] Preparation of an epoxy resin: Exactly the same as Example 3, except that PKHH is not added.

[0059] The epoxy resin prepared in this comparative example has a flexural strength of 80 MPa and a plane strain fracture toughness of K IC-R 0.7MPa·m 1 / 2 , critical strain energy release rate G IC 0.3kJ / m².

[0060] By comparison, it can be seen that the introduction of phenoxy resin can effectively improve the bending strength and fracture toughness of epoxy resin.

[0061] The above is only a specific implementation of the present invention, which enables those skilled in the art to understand or implement the present invention. Although detailed descriptions are given with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments, and they should all be covered by the protection scope of the claims.

Claims

1. A streamlined preparation process for one-piece molding of high-speed impact-resistant carbon fiber / resin composite materials based on a prefabricated interlayer toughening structure, characterized in that: The high-speed impact-resistant carbon fiber / resin composite material based on the prefabricated interlayer toughening structure is obtained by placing the prefabricated interlayer toughening structure between adjacent carbon fiber cloth layers coated with phenoxy resin modified epoxy resin glue, and finally hot pressing the prefabricated interlayer toughening structure as a whole; the prefabricated interlayer toughening structure is impregnated with phenoxy resin modified epoxy resin glue with a surface density of 5 to 50 g / m 2 The chopped fiber mat is obtained by prepolymerizing under heating and pressure conditions.

2. The streamlined preparation process for integrated high-speed impact-resistant carbon fiber / resin composite material based on prefabricated interlayer toughening structure according to claim 1, characterized in that: The chopped fiber mat is prepared by dispersing chopped fibers in a cellulose aqueous solution, followed by filtering and drying.

3. The streamlined preparation process for integrated high-speed impact-resistant carbon fiber / resin composite material based on prefabricated interlayer toughening structure according to claim 2, characterized in that: The chopped fibers are selected from any one of chopped carbon fibers, chopped glass fibers, and chopped aramid fibers, or a mixture of the two or more thereof; the diameter of the chopped fibers is 3 to 6 mm, and the length is 5 to 15 mm.

4. The streamlined preparation process for integrated high-speed impact-resistant carbon fiber / resin composite material based on prefabricated interlayer toughening structure according to claim 1, characterized in that: The phenoxy resin modified epoxy resin glue is obtained by sequentially adding phenoxy resin, curing agent and accelerator into heated epoxy resin and mixing them evenly.

5. The streamlined preparation process for integrated high-speed impact-resistant carbon fiber / resin composite material based on prefabricated interlayer toughening structure according to claim 4, characterized in that: The epoxy resin is selected from any one of bisphenol A epoxy resin, bisphenol F epoxy resin, and novolac epoxy resin, or a mixture of several of them; the number average molecular weight of the phenoxy resin is 11,000 to 16,000.

6. The streamlined preparation process for integrated high-speed impact-resistant carbon fiber / resin composite material based on prefabricated interlayer toughening structure according to claim 4, characterized in that: The curing agent is selected from any one of anhydride curing agents and amine curing agents; the accelerator is selected from any one of 2, 4, 6-tris(dimethylaminomethyl)phenol, 2,4,6-tris(aminomethyl)phenol, and N,N-diethyl-3,4,5-trimethylaniline.

7. The streamlined preparation process for integrated high-speed impact-resistant carbon fiber / resin composite material based on prefabricated interlayer toughening structure according to claim 4, characterized in that: When preparing the phenoxy resin modified epoxy resin glue, the mass ratio of the phenoxy resin to the epoxy resin is 0.05-0.20:1, and the mass ratio of the epoxy resin: the curing agent: the accelerator is 1: 0.7-0.9: 0.001-0.

01.

8. The streamlined preparation process for integrated high-speed impact-resistant carbon fiber / resin composite material based on prefabricated interlayer toughening structure according to claim 1, characterized in that: When preparing the prefabricated interlayer toughening structure, the time for impregnating the chopped fiber felt with the phenoxy resin modified epoxy resin adhesive is 20 to 60 minutes; the prepolymerization temperature is 60 to 80° C., the prepolymerization pressure is 0.5 to 2 MPa, and the prepolymerization time is 30 to 50 minutes.

9. The streamlined preparation process for integrated high-speed impact-resistant carbon fiber / resin composite material based on prefabricated interlayer toughening structure according to claim 1, characterized in that: The cellulose is selected from any one of methyl cellulose, hydroxyethyl cellulose, and hydroxypropyl cellulose, or a mixture thereof; the concentration of the cellulose solution is 0.5 to 1.2 g / L; the surface density of the obtained short fiber felt is 5 to 50 g / m 2 .

10. The streamlined preparation process for integrated high-speed impact-resistant carbon fiber / resin composite material based on prefabricated interlayer toughening structure according to claim 1, characterized in that: The integral hot pressing molding is performed at a temperature of 100 to 150° C., for a time of 120 to 300 min, and at a pressure of 0 to 20 MPa.

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