Carbon fiber prepreg for light absorption structure, preparation method and lens cone prepared from carbon fiber prepreg

Abstract

The invention relates to the technical field of carbon fiber materials, in particular to a carbon fiber prepreg for a light absorption structure, a preparation method of the carbon fiber prepreg and a lens cone prepared from the carbon fiber prepreg, and the carbon fiber prepreg for the light absorption structure is prepared from a carbon fiber tow and the following components in parts by weight: 80-100 parts of epoxy resin, 60-80 parts of carbon nanotubes, 5-10 parts of a curing agent and 0.5-1.0 part of an accelerant. According to the carbon fiber prepreg for the light absorption structure, the preparation method and the lens barrel prepared from the carbon fiber prepreg, the carbon nanotubes are added into the carbon fiber prepreg to serve as a light absorption material, the process of preparing the lens barrel in the mode of adding a coating on a structural layer is replaced, and therefore the situation that the coating of the lens barrel is deteriorated and cracked is reduced, the service life of the lens barrel is prolonged, and the service life of the lens barrel is prolonged. Meanwhile, the problem that the thickness of the added coating is increased is also avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon fiber materials, and in particular to a carbon fiber prepreg for a light-absorbing structure, a preparation method, and a lens barrel prepared using the same. Background Art

[0002] With the development of space remote sensing technology, Earth observation cameras with high resolution, long focal length, and wide field of view are constantly being introduced. This has led to increasingly stringent requirements for lightweight and stable camera structures. The lens barrel is the primary load-bearing component of a camera, and its performance is directly related to its performance and even functionality.

[0003] Carbon fiber, a high-performance carbon material that emerged in the 1960s, boasts high-temperature and corrosion resistance, high strength, and a high specific modulus. It is an ideal material and is rapidly expanding across various industries, particularly in aerospace, where it holds great promise. Mirror barrels made of carbon fiber composites offer numerous advantages, including structural openness, ease of optical assembly and adjustment, minimal surface contamination, and low weight.

[0004] As an optical component, the inner wall of the lens barrel requires a very high visible light absorption rate. Currently, commonly used composite lens barrels use carbon fiber reinforced high-temperature epoxy resin as the structure, and then spray-coated with a light-absorbing coating to achieve the structure's light absorption function. In the high temperature environment of space, the coating is prone to deterioration and cracking after long-term use. In addition, the coating increases the thickness of the structure, reducing the mechanical properties of the material. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to propose a carbon fiber prepreg for light-absorbing structure, a preparation method and a lens barrel prepared using the same, so as to solve the technical problem that the existing lens barrel has a light-absorbing coating sprayed on the surface of the structure, which is prone to deterioration and cracking in the high temperature environment of space.

[0006] Based on the above objectives, the present invention provides a carbon fiber prepreg for a light-absorbing structure, which is composed of a carbon fiber tow and the following components in parts by weight:

[0007] 80-100 parts of epoxy resin, 60-80 parts of carbon nanotubes, 5-10 parts of curing agent, 0.5-1.0 parts of accelerator, and 0.3-0.5 parts of filler;

[0008] The epoxy resin is selected from one of 128 epoxy resin, E51 epoxy resin and 6101 epoxy resin, or a mixture of any two of them; the carbon nanotubes are single-walled carbon nanotubes with an outer diameter of 2 nm and a length of 5-15 μm; the curing agent is a product of the reaction of aniline-formaldehyde and dicyandiamide; the accelerator is selected from one of acrylamide, polyvinyl butyral, organic urea and α-methacrylic acid passivated 2-ethyl-4-methylimidazole, or a mixture of any two of them; the filler is asbestos powder or quartz powder; and the carbon fiber prepreg used for the light-absorbing structure has a solar light absorptivity of >99%.

[0009] Optionally, the preparation process of the carbon fiber is dry-jet wet spinning, the specification is T700 grade 12K, and the linear density is 800±15g / km.

[0010] Optionally, the surface density of the carbon fiber prepreg is 125±5g / m 2 , the epoxy resin solution content is 33±2%.

[0011] Another aspect of the present invention provides a method for preparing a carbon fiber prepreg for a light-absorbing structure, comprising the following steps:

[0012] Step 1: Prepare epoxy resin mixture:

[0013] Step 1.1, preheating the epoxy resin, carbon nanotubes, curing agent, and accelerator in a dry container until they are completely melted at a temperature of 55-60°C for 65-75 minutes;

[0014] Step 1.2: Then, place the preheated resin in a grinder and knead it for 40-50 minutes, then cool it down to 40-50°C at room temperature; finally, place the ground resin mixture in a cold storage at ≤-18°C for later use;

[0015] Step 1.3: Place the kneaded resin mixture in a reactor at a temperature of 50-60°C, evacuate, add fillers, turn on the high-speed shaft and dispersion disk to stir and disperse, and mix for 30-60 minutes before discharging;

[0016] Finally, the mixture was cooled at room temperature and stored in a cold storage at ≤-18°C for future use.

[0017] Step 2: Prepare carbon fiber prepreg:

[0018] Step 2.1, the epoxy resin mixture obtained in step 1.3 is subjected to a casting process to form a smooth and uniform epoxy resin film on a release paper;

[0019] Step 2.2: Pull the carbon fiber tow onto the epoxy film in step 2.1, and impregnate the epoxy resin film into the carbon fiber tow to obtain a prepreg semi-finished product;

[0020] Step 2.3, drying the product obtained in step 2.2;

[0021] Step 2.4: Place the isolation film on the product dried in step 2.3;

[0022] Step 2.5: Use a winding device to wind up the product in step 2.4 to obtain a carbon fiber prepreg.

[0023] Another aspect of the present invention provides a lens barrel, which is prepared by a hot pressing molding process using multiple layers of the carbon fiber prepreg for the light-absorbing structure, wherein the thickness of a single layer of the carbon fiber prepreg for the light-absorbing structure is 0.125±0.01 mm.

[0024] Optionally, the hot pressing molding process specifically includes: hot pressing multiple layers of the light absorbing structure using carbon fiber prepreg to form a lens barrel, and then curing the lens barrel at a temperature of 130±5°C.

[0025] The beneficial effects of the present invention are as follows: the carbon fiber prepreg for light-absorbing structure, the preparation method, and the lens barrel prepared using the same are adopted, and carbon nanotubes are added to the carbon fiber prepreg as the light-absorbing material, replacing the process of preparing the lens barrel by adding a structural layer to a coating, thereby reducing the deterioration and cracking of the coating on the surface of the lens barrel and avoiding the problem of increased coating thickness.

[0026] The use of carbon nanotubes as black pigment increases the light absorption of the matrix resin. In addition, the use of modified dicyandiamide as a curing agent greatly improves the compatibility between epoxy resin and dicyandiamide, thereby improving the quality of the formed composite material. The use of domestically produced T700-grade dry-jet wet-spun carbon fiber as the reinforcing phase has a smooth, groove-free surface. The prepared carbon fiber has a relatively uniform, dense internal structure with few holes, a smooth fiber surface, and a high bulk density. As the reinforcing phase of the carbon fiber prepreg for the light-absorbing structure of the present invention, it provides guarantees for the quality consistency of the subsequent carbon fiber composite lens barrel and the product qualification rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 This is a test data diagram of a sunlight reflection test of a flat plate prepared from the carbon fiber prepreg according to Example 1 of the present invention; DETAILED DESCRIPTION

[0029] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to specific embodiments.

[0030] It should be noted that, unless otherwise defined, the technical or scientific terms used in the present invention should have the usual meanings understood by people with ordinary skills in the field to which the present invention belongs. The "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0031] Example 1

[0032] A carbon fiber prepreg for a light-absorbing structure, comprising carbon fiber tow and the following components in parts by weight:

[0033] 80 parts of epoxy resin, 80 parts of carbon nanotubes, 5 parts of curing agent, 0.5 parts of accelerator, and 0.3 parts of filler; the epoxy resin is 128 epoxy resin, the carbon nanotubes are single-walled carbon nanotubes with an outer diameter of 2nm and a length of 5μm, the curing agent is a product of the reaction of aniline-formaldehyde and dicyandiamide, the accelerator is a mixture of acrylamide and polyvinyl butyral, and the filler is asbestos powder.

[0034] A method for preparing a carbon fiber prepreg for a light-absorbing structure comprises the following steps:

[0035] Step 1: Prepare epoxy resin mixture:

[0036] Step 1.1, prepare 80 parts of epoxy resin, 80 parts of carbon nanotubes, 5 parts of curing agent, 0.5 parts of accelerator, and 0.3 parts of filler according to parts by weight, and preheat them in a dry container until they are completely melted. The preheating temperature is 65°C and the time is 75 minutes;

[0037] Step 1.2: The preheated resin was then placed in a grinder for kneading for 50 minutes, and then cooled to 50°C at room temperature; finally, the ground resin mixture was placed in a cold storage at ≤-18°C for later use;

[0038] Step 1.3: Place the kneaded resin mixture in a reactor at 50°C, evacuate the mixture, add fillers, turn on the high-speed shaft and dispersion disk to stir and disperse, and mix for 30 minutes before discharging.

[0039] Finally, the mixture was cooled at room temperature and stored in a cold storage at ≤-18°C for future use.

[0040] Step 2: Prepare carbon fiber prepreg:

[0041] Step 2.1, the epoxy resin mixture obtained in step 1.3 is subjected to a casting process to form a smooth and uniform epoxy resin film on a release paper;

[0042] Step 2.2: Pull the carbon fiber tow onto the epoxy film in step 2.1, and impregnate the epoxy resin film into the carbon fiber tow to obtain a prepreg semi-finished product;

[0043] Step 2.3, drying the product obtained in step 2.2;

[0044] Step 2.4: Place the isolation film on the product dried in step 2.3;

[0045] Step 2.5: Use a winding device to wind up the product in step 2.4 to obtain a carbon fiber prepreg.

[0046] The surface density of the prepared carbon fiber prepreg is 120g / m 2 , the epoxy resin solution content is 31%.

[0047] According to the test method in the standard "GJB 2502.2-2015 Test Methods for Spacecraft Thermal Control Coatings Part 2: Solar Absorption Ratio Test", a solar reflection test was conducted on a flat plate prepared using the prepreg of this embodiment. The results are as follows: Figure 1 As shown, the solar light absorption rate is greater than 99%, which meets the use requirements for preparing the lens barrel.

[0048] Example 2

[0049] A carbon fiber prepreg for a light-absorbing structure, comprising carbon fiber tow and the following components in parts by weight:

[0050] 100 parts of epoxy resin, 65 parts of carbon nanotubes, 10 parts of curing agent, 1 part of accelerator, and 0.5 parts of filler; the epoxy resin is a mixture of 128 epoxy resin and E51 epoxy resin, the carbon nanotubes are single-walled carbon nanotubes with an outer diameter of 2nm and a length of 15μm, the curing agent is a product of the reaction of aniline-formaldehyde and dicyandiamide, the accelerator is a mixture of acrylamide and organic urea, and the filler is quartz powder.

[0051] A method for preparing a carbon fiber prepreg for a light-absorbing structure comprises the following steps:

[0052] Step 1: Prepare epoxy resin mixture:

[0053] Step 1.1: Prepare 100 parts of epoxy resin, 65 parts of carbon nanotubes, 10 parts of curing agent, 1 part of accelerator, and 0.5 parts of filler according to parts by weight, and preheat them in a dry container until they are completely melted. The preheating temperature is 55° C. and the time is 65 minutes.

[0054] Step 1.2: The preheated resin was then placed in a grinder for kneading for 40 minutes, and then cooled to 40°C at room temperature; finally, the ground resin mixture was placed in a cold storage at ≤-18°C for later use;

[0055] Step 1.3: Place the kneaded resin mixture in a reactor at 60°C, evacuate the mixture, add fillers, turn on the high-speed shaft and dispersion disk to stir and disperse, and discharge the mixture after mixing for 60 minutes;

[0056] Finally, the mixture was cooled at room temperature and stored in a cold storage at ≤-18°C for future use.

[0057] Step 2: Prepare carbon fiber prepreg:

[0058] Step 2.1, the epoxy resin mixture obtained in step 1.3 is subjected to a casting process to form a smooth and uniform epoxy resin film on a release paper;

[0059] Step 2.2: Pull the carbon fiber tow onto the epoxy film in step 2.1, and impregnate the epoxy resin film into the carbon fiber tow to obtain a prepreg semi-finished product;

[0060] Step 2.3, drying the product obtained in step 2.2;

[0061] Step 2.4: Place the isolation film on the product dried in step 2.3;

[0062] Step 2.5: Use a winding device to wind up the product in step 2.4 to obtain a carbon fiber prepreg.

[0063] The surface density of the prepared carbon fiber prepreg is 125g / m 2 , the epoxy resin solution content is 33%.

[0064] Example 3

[0065] A carbon fiber prepreg for a light-absorbing structure, comprising carbon fiber tow and the following components in parts by weight:

[0066] 90 parts of epoxy resin, 60 parts of carbon nanotubes, 8 parts of curing agent, 0.7 parts of accelerator, and 0.4 parts of filler; the epoxy resin is a mixture of 6101 epoxy resin and E51 epoxy resin, the carbon nanotubes are single-walled carbon nanotubes with an outer diameter of 2nm and a length of 10μm, the curing agent is a product of the reaction of aniline-formaldehyde and dicyandiamide, the accelerator is a mixture of α-methacrylate passivated 2-ethyl-4-methylimidazole and organic urea, and the filler is quartz powder.

[0067] A method for preparing a carbon fiber prepreg for a light-absorbing structure comprises the following steps:

[0068] Step 1: Prepare epoxy resin mixture:

[0069] Step 1.1: Prepare 100 parts of epoxy resin, 65 parts of carbon nanotubes, 10 parts of curing agent, 1 part of accelerator, and 0.5 parts of filler according to parts by weight, and preheat them in a dry container until they are completely melted. The preheating temperature is 55° C. and the time is 65 minutes.

[0070] Step 1.2: The preheated resin was then placed in a grinder for kneading for 40 minutes, and then cooled to 40°C at room temperature; finally, the ground resin mixture was placed in a cold storage at ≤-18°C for later use;

[0071] Step 1.3: Place the kneaded resin mixture in a reactor at 60°C, evacuate the mixture, add fillers, turn on the high-speed shaft and dispersion disk to stir and disperse, and discharge the mixture after mixing for 60 minutes;

[0072] Finally, the mixture was cooled at room temperature and stored in a cold storage at ≤-18°C for future use.

[0073] Step 2: Prepare carbon fiber prepreg:

[0074] Step 2.1, the epoxy resin mixture obtained in step 1.3 is subjected to a casting process to form a smooth and uniform epoxy resin film on a release paper;

[0075] Step 2.2: Pull the carbon fiber tow onto the epoxy film in step 2.1, and impregnate the epoxy resin film into the carbon fiber tow to obtain a prepreg semi-finished product;

[0076] Step 2.3, drying the product obtained in step 2.2;

[0077] Step 2.4: Place the isolation film on the product dried in step 2.3;

[0078] Step 2.5: Use a winding device to wind up the product in step 2.4 to obtain a carbon fiber prepreg.

[0079] The surface density of the prepared carbon fiber prepreg is 130g / m 2 , the epoxy resin solution content is 35%.

[0080] Example 4

[0081] A lens barrel is prepared by a hot pressing process using a multi-layer carbon fiber prepreg for a light-absorbing structure, wherein the thickness of a single-layer carbon fiber prepreg for a light-absorbing structure is 0.124 mm.

[0082] The hot pressing molding process specifically includes: hot pressing a multi-layer light-absorbing structure using carbon fiber prepreg to form a lens barrel, and then curing it at a temperature of 125°C.

[0083] Example 5

[0084] A lens barrel is prepared by a hot pressing process using a multi-layer carbon fiber prepreg for a light-absorbing structure, wherein the thickness of a single-layer carbon fiber prepreg for a light-absorbing structure is 0.125 mm.

[0085] The hot pressing molding process specifically includes: hot pressing a multi-layer light-absorbing structure using carbon fiber prepreg to form a lens barrel, and then curing it at a temperature of 130°C.

[0086] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples. Within the scope of the present invention, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0087] The present invention is intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A carbon fiber prepreg for a light-absorbing structure, characterized in that: It is composed of carbon fiber tow and the following components in parts by weight: 80-100 parts of epoxy resin, 60-80 parts of carbon nanotubes, 5-10 parts of curing agent, 0.5-1.0 parts of accelerator, and 0.3-0.5 parts of filler; The epoxy resin is selected from one of 128 epoxy resin, E51 epoxy resin and 6101 epoxy resin, or a mixture of any two of them; the carbon nanotubes are single-walled carbon nanotubes with an outer diameter of 2 nm and a length of 5-15 μm; the curing agent is a product of the reaction of aniline-formaldehyde and dicyandiamide; the accelerator is selected from one of acrylamide, polyvinyl butyral, organic urea and α-methacrylic acid passivated 2-ethyl-4-methylimidazole, or a mixture of any two of them; the filler is asbestos powder or quartz powder; and the carbon fiber prepreg used for the light-absorbing structure has a solar light absorptivity of >99%.

2. The carbon fiber prepreg for light-absorbing structure according to claim 1, characterized in that: The preparation process of carbon fiber is dry-jet wet spinning, the specification is T700 grade 12K, and the linear density is 800±15g / km.

3. The carbon fiber prepreg for light-absorbing structure according to claim 1, characterized in that: The surface density of the carbon fiber prepreg is 125±5g / m 2 , the epoxy resin solution content is 33±2%.

4. A method for preparing a carbon fiber prepreg for a light-absorbing structure according to any one of claims 1 to 3, characterized in that: The steps include: Step 1: Prepare epoxy resin mixture: Step 1.1, preheating the epoxy resin, carbon nanotubes, curing agent, and accelerator in a dry container until they are completely melted at a temperature of 55-60°C for 65-75 minutes; Step 1.2: Place the preheated resin in a grinder and knead for 40-50 minutes, then cool it down to 40-50°C at room temperature; finally, place the ground resin mixture in a cold storage at ≤-18°C for later use; Step 1.3: Place the kneaded resin mixture in a reactor at a temperature of 50-60°C, evacuate, add fillers, turn on the high-speed shaft and dispersion disk to stir and disperse, and mix for 30-60 minutes before discharging; Finally, the mixture was cooled at room temperature and stored in a cold storage at ≤-18°C for later use; Step 2: Prepare carbon fiber prepreg: Step 2.1, the epoxy resin mixture obtained in step 1.3 is subjected to a casting process to form a smooth and uniform epoxy resin film on a release paper; Step 2.2: Pull the carbon fiber tow onto the epoxy film in step 2.1, and impregnate the epoxy resin film into the carbon fiber tow to obtain a prepreg semi-finished product; Step 2.3, drying the product obtained in step 2.2; Step 2.4: Place the isolation film on the product dried in step 2.3; Step 2.5: Use a winding device to wind up the product in step 2.4 to obtain a carbon fiber prepreg.

5. A lens barrel, characterized in that: The lens barrel is prepared by a multi-layer carbon fiber prepreg for light-absorbing structure according to any one of claims 1 to 3 under a hot pressing molding process, and the thickness of a single layer of the carbon fiber prepreg for light-absorbing structure is 0.125±0.01 mm.

6. The lens barrel according to claim 5, wherein: The hot pressing molding process specifically includes: hot pressing multiple layers of the light absorbing structure using carbon fiber prepreg to form a lens barrel, and then curing it at a temperature of 130±5°C.

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