A device and method for preparing carbon fiber composite reinforcement for marine engineering

Abstract

The present invention relates to the technical field of marine engineering materials, and in particular to a preparation device and method for carbon fiber composite reinforcement for marine engineering, comprising a carbon fiber creel, a glue injection device, a yarn collecting hole, a preforming mold, a winding device, a curing mold, an unwinder, a traction machine, a cutting machine, and a winder. The winding device comprises a winding machine, a rotating disk, and a winding disk. A fiber oven for carbon fiber filaments to pass through is provided between the carbon fiber creel and the glue injection device; an optical fiber pay-off disk is provided between the fiber oven and the glue injection device; the glue injection device is a cylindrical linear glue injection box, the top of which is connected to a resin pre-storage box, and the two ends of which are respectively connected to a yarn dividing plate 1 and a yarn dividing plate 2, wherein the middle of the yarn dividing plate 1 and the yarn dividing plate 2 are provided with an optical fiber hole, and the edge circumferentially provides a fiber hole. The present invention has the following beneficial effects: high material toughness and intelligent monitoring level, strong comprehensive material performance, and low preparation cost.

Description

Technical Field

[0001] The present invention relates to the technical field of marine engineering materials, and in particular to a device and method for preparing carbon fiber composite material reinforcement for marine engineering. Background Art

[0002] With the accelerated development and utilization of marine resources worldwide, the requirements for material performance in the marine engineering field are increasing. Traditional marine engineering materials, such as steel, while possessing certain strength and durability, often exhibit problems such as insufficient corrosion resistance, heavy weight, and high maintenance costs when exposed to the complex marine environment. Therefore, the development of new marine engineering materials with high performance, high toughness, corrosion resistance, and intelligent features is particularly important.

[0003] As an advanced, high-performance material, carbon fiber composites (CFRPs) are widely used in a variety of fields, including aerospace, automotive, and sports equipment, due to their lightweight, high-strength, and corrosion-resistant properties. In recent years, with the continuous advancement of technology, the application of CFRPs in marine engineering has also gradually increased. However, existing CFRPs still need to be improved in terms of toughness and intelligence, and cannot meet the higher material performance requirements of marine engineering.

[0004] Fiber-optic intelligent technology embeds fiber-optic sensors into materials to enable real-time monitoring of material properties and intelligent response. Fiber-optic sensors can monitor material parameters such as stress, strain, and temperature in real time, providing crucial data support for health monitoring and safety assessment of offshore engineering structures. Furthermore, combined with intelligent control algorithms, they can achieve self-regulation and optimization of material properties, improving the overall performance and safety of offshore engineering structures.

[0005] Existing carbon fiber composite materials for marine engineering have the following disadvantages:

[0006] 1. Insufficient material toughness.

[0007] Current state of the art: Although carbon fiber composites are widely used in marine engineering, their toughness is relatively limited. In complex marine environments, long-term exposure to dynamic loads and extreme conditions can easily lead to fatigue and fracture of the material, thus affecting the safety and service life of marine engineering structures.

[0008] Reason: The formula and preparation process of traditional carbon fiber composite materials fail to fully optimize the toughness of the material, especially in the interface bonding between the fiber and the matrix, the arrangement of the fibers, and the toughening modification of the matrix.

[0009] 2. The level of intelligent monitoring is low.

[0010] Current state of the art: Current monitoring methods for marine engineering structures rely heavily on traditional sensors and equipment, often with a low level of intelligence. These sensors can only monitor a limited range of parameters, and their limited data transmission and processing capabilities make it difficult to accurately and timely reflect the actual condition of the structure.

[0011] Reason: The application of fiber optic sensing technology in marine engineering is not yet widespread and intensive, especially due to the lack of mature technical solutions for its integration with carbon fiber composite materials. Furthermore, key technologies such as fiber optic sensor embedding, signal transmission, and data processing still require further breakthroughs.

[0012] 3. Overall performance needs to be improved.

[0013] Current state of the art: While carbon fiber composites offer advantages in strength and modulus, there is still room for improvement in corrosion resistance, lightweighting, and integration with other functions. Extreme environments, such as deep sea, place even higher demands on the material's comprehensive performance.

[0014] Reason: Existing technologies fail to fully consider the special needs of marine engineering, such as deep-sea high pressure and seawater corrosion. Furthermore, further efforts are needed to optimize material formulations and preparation processes to maximize the overall performance of the materials.

[0015] 4. The preparation process is complicated and the cost is high.

[0016] Current state of the art: The preparation process for carbon fiber composites is relatively complex, requiring high-precision equipment and strict process control. This not only increases production difficulty and cycle time, but also raises production costs.

[0017] The reason: The preparation of carbon fiber composites involves multiple steps, such as fiber pretreatment, resin formulation, and molding. Each step requires meticulous control to ensure the quality and performance of the final product. However, this high level of demand also leads to increased complexity and cost in the preparation process. Summary of the Invention

[0018] The purpose of the present invention is to provide a method and device for preparing carbon fiber composite reinforcement for marine engineering, so as to improve the toughness of the material, enhance the level of intelligent monitoring, optimize the comprehensive performance of the material, and reduce the complexity and cost of the preparation process.

[0019] The above technical objectives of the present invention are achieved through the following technical solutions:

[0020] A device for preparing carbon fiber composite reinforcement for marine engineering, comprising a carbon fiber creel, a glue injection device, a yarn collecting hole, a preforming mold, a winding device, a curing mold, an unwinder, a traction machine, a cutting machine, and a winding machine. The winding device comprises a winding machine, a rotating disk, and a winding disk.

[0021] A fiber drying oven for the carbon fiber filaments to pass through is provided between the carbon fiber creel and the glue injection device;

[0022] An optical fiber pay-off reel is provided between the fiber drying oven and the glue injection device;

[0023] The glue injection device is a cylindrical linear glue injection box, the top of which is connected to a resin pre-storage box, and the two ends of which are respectively connected to a yarn separation plate 1 and a yarn separation plate 2. The middle of the yarn separation plate 1 and the yarn separation plate 2 are provided with fiber holes, and the edges are provided with fiber holes.

[0024] By adopting the above technical solution, the carbon fiber filaments are baked in a fiber oven, which can volatilize part of the impregnating agent in the carbon fiber. After being impregnated with resin, the bonding between the carbon fiber filaments and the resin can be improved, thereby improving the compression and bending properties of the carbon fiber composite reinforcement; optical fibers are added to the carbon fiber composite reinforcement, and the stress, strain, temperature and other parameters of the composite material are monitored in real time through optical fiber sensing technology; the optical fiber passes through the optical fiber hole with a certain tension, and then converges with the carbon fiber filaments at the yarn collection hole, which can ensure that the optical fiber remains absolutely centered in the carbon fiber composite reinforcement to ensure the stability of the optical fiber detection data; uniform fiber holes are opened on the first and second sides of the yarn separation plate, and used in conjunction with the cylindrical linear glue injection box, firstly, the problem of hairiness of the carbon fiber filaments caused by bending and the loss of mechanical properties is reduced; secondly, the cylindrical The middle of the linear glue injection box is a hollow cylindrical tube. In this way, the amount of epoxy resin used is greatly reduced. Basically, the epoxy resin used is always new glue. There will be no small amount of glue used in the pultrusion process, and it will circulate back and forth, which will cause the epoxy resin to age and increase the viscosity, affecting the effect of epoxy resin impregnation of the fiber, and then affecting the Tg and mechanical properties of the carbon fiber composite material reinforcement. The pultrusion speed of this device can be increased from 300mm / min to 700mm / min; adding a pre-formed mold after the yarn gathering hole can further regularize the fiber bundle and play a role in squeezing glue, squeezing out excess glue and reducing the glue squeezing pressure at the mold mouth; the winding disk can adjust the angle, and the winding machine can adjust the frequency. The two work together to produce high-toughness optical fiber intelligent carbon fiber composite material reinforcement with continuous thread on the surface of different pitches.

[0025] Preferably, a liquid level observation tube is connected between the resin pre-storage box and the cylindrical linear glue injection box.

[0026] By adopting the above technical solution, the amount of glue added can be adjusted at any time according to the consumption of epoxy resin, and the amount of resin in the cylindrical linear glue injection box can be kept stable, thereby ensuring the stability of the carbon fiber composite material reinforcement production process.

[0027] Preferably, a glue groove is provided below the cylindrical linear glue injection box, the opening of the glue groove is upward, and is located below the entrance of the cylindrical linear glue injection box, the yarn collecting hole, the preforming mold, the winding device, and the curing mold. The glue groove is connected to a resin tube, the end of the resin tube is connected to the resin pre-storage box, and the resin tube is connected to a vacuum pump.

[0028] By adopting the above technical solution, the glue squeezed out from the solidified mold mouth and the glue flowing out from the front and rear yarn dividing plates 1 and 2 of the empty cylindrical linear glue injection box flow into the glue tank below, and the resin in the glue tank is pumped into the resin pre-storage box by a vacuum pump.

[0029] Preferably, the resin tube is connected to the bottom of the glue tank, and the bottom surface of the glue tank is inclined downward near the nozzle of the resin tube.

[0030] By adopting the above technical solution, it can be ensured that the reflow glue is concentrated at the nozzle of the resin pipe, and the reflow glue liquid can be pumped out cleanly when the vacuum pump is working, thereby avoiding the situation where some resin is stagnant.

[0031] Preferably, the length of the curing mold is 800 mm, which is divided into a water cooling zone and three temperature zones, wherein the length of the water cooling zone is 100 mm, the length of the first temperature zone is 100 mm, the length of the second temperature zone is 300 mm, and the length of the third temperature zone is 300 mm.

[0032] Preferably, a water circulation system is provided at the front end of the curing mold.

[0033] By adopting the above technical solution, a water circulation system is added to the front end of the curing mold to reduce the mold inlet temperature of the curing mold, thereby reducing the thermal aging of the resin.

[0034] A method for preparing carbon fiber composite reinforcement for marine engineering, comprising modifying epoxy resin by the following method:

[0035] To 105 parts of epoxy curing agent, add 5-10 parts of special polyether polymer with active hydroxyl groups, 1-2 parts of a mixed solution containing synthetic resin, glyceride and organic acid derivative and organic phosphate copolymer, 0.5-1 part of foam-breaking polymer and polysiloxane solution, and stir for 3-5 minutes; then add 100 parts of epoxy resin and stir for another 10 minutes; then let it stand for 10 minutes to obtain a modified high-toughness high-temperature epoxy resin.

[0036] By adopting the above technical solution, the modified high-toughness high-temperature epoxy resin is prepared, and the composite material prepared by combining it with carbon fiber filaments has significantly improved bending performance and fatigue performance.

[0037] Preferably, 8 parts of a special polyether polymer with active hydroxyl groups, 1.5 parts of a mixed solution containing synthetic resin, glyceride and organic acid derivatives and organic phosphate copolymer, and 0.8 parts of a foam-breaking polymer and polysiloxane solution are added, mixed thoroughly, and then mixed with a high-temperature epoxy resin.

[0038] By adopting the above technical solution, the carbon fiber composite material reinforcement made of the modified high-toughness high-temperature epoxy resin is obtained, and various properties are optimal.

[0039] Preferably, step 1: pouring the modified high-toughness high-temperature epoxy resin prepared according to claim 7 into a cylindrical linear glue injection box;

[0040] Step 2: The carbon fiber filaments are led out from the carbon fiber creel and enter the fiber oven. The temperature of the fiber oven is set at 140-220℃. After the carbon fiber filaments are led out from the fiber oven, they pass through the first yarn splitting plate together with the optical fiber. The carbon fiber filaments pass through the fiber hole outside the yarn splitting plate and enter the cylindrical linear glue injection box, and then are led out from the second yarn splitting plate. The optical fiber passes through the fiber hole in the middle of the yarn splitting plate and is led out from the fiber hole of the yarn splitting plate. The carbon fiber filaments and the optical fiber converge at the yarn collecting hole to form a fiber bundle, which is then squeezed through the preforming mold;

[0041] Step 3: The fiber bundle then passes through the center of the rotating disk, and the winding machine starts working, winding the embossed tape on the surface of the fiber bundle; by adjusting the thickness and width of the wrapped embossed tape, the embossing depth and embossing width of the high-toughness optical fiber 32 intelligent carbon fiber composite material reinforcement are controlled; by adjusting the motor frequency of the winding machine, the pitch of the embossing on the reinforcement surface is controlled; by controlling the angle of the winding disk, the direction of the embossed tape is adjusted to form an angle α with the axis direction of the fiber bundle, and the value range of α is 50-70°;

[0042] Step 4: The fiber bundle with the embossed tape wrapped around its surface is pulled into a curing mold by a traction machine for curing, and is shaped into a high-toughness optical fiber intelligent carbon fiber composite reinforcement with continuous threads on the surface;

[0043] Step 5: After the high-toughness optical fiber intelligent carbon fiber composite material reinforcement with continuous threads on the surface is completely cured in the curing mold, it passes through the unwinder to unwind the embossed tape. The composite material reinforcement with the embossed tape torn off is transported to the cutting machine under the action of the traction machine to cut the composite material reinforcement to a fixed length or pass it through the winder for winding.

[0044] Preferably, when smooth round ribs need to be produced, the winding machine and the unwinding machine are stopped, and 2-5 carbon fibers are added to the carbon fiber creel for filling.

[0045] In summary, the present invention has the following beneficial effects:

[0046] 1. Improved material toughness. Addressing the issue of existing carbon fiber composites' insufficient toughness in marine environments, this invention significantly enhances the toughness of the composite material by optimizing the material formulation and preparation process. This includes improving the interfacial bonding between the fiber and the matrix, optimizing the fiber arrangement, and enhancing the toughness of the matrix. This ensures that the composite material can resist fatigue damage and fracture in complex marine environments, thereby improving the safety and service life of marine engineering structures.

[0047] 2. Improved intelligent monitoring. To address the shortcomings of existing marine engineering structure monitoring methods, this invention combines fiber optic sensing technology with carbon fiber composite materials to achieve intelligent monitoring of composite materials. By embedding fiber optic sensors within the composite reinforcement, key parameters such as stress, strain, and temperature of the structure can be monitored in real time. Leveraging advanced data transmission and processing technologies, accurate assessments and early warnings of the health of marine engineering structures can be achieved. This helps improve operational efficiency, reduce operational costs, and ensure the safe operation of marine engineering structures.

[0048] 3. Optimized the overall material performance. Addressing the shortcomings of existing carbon fiber composites in terms of corrosion resistance, lightweighting, and integration with other functions, this invention comprehensively enhances the composite's overall performance by optimizing the material formulation and preparation process. This includes enhancing the material's corrosion resistance to address corrosion challenges in extreme environments such as the deep sea; reducing the material's weight to lower the weight and construction costs of marine engineering structures; and integrating the material with other functions, such as electrical and thermal conductivity, to meet the diverse needs of the marine engineering field.

[0049] 4. Reduced manufacturing process complexity and cost. Addressing the complex and costly manufacturing processes of existing carbon fiber composite materials, this invention aims to simplify the manufacturing process and reduce production costs. By employing innovative manufacturing processes and equipment, production efficiency is improved, production cycle times are shortened, and the requirements for high-precision equipment and strict process control are reduced. This will help promote the widespread application of carbon fiber composites in marine engineering and promote the advancement and development of marine engineering technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 It is a structural schematic diagram of the preparation device;

[0051] Figure 2 It is a cross-sectional view of a cylindrical linear injection box;

[0052] Figure 3 1 is a schematic diagram of the structure of the yarn splitting plate 1 and the yarn splitting plate 2;

[0053] Figure 4 It is a structural diagram of threaded reinforcement;

[0054] Figure 5It is a structural schematic diagram of a preparation device in the prior art.

[0055] In the figure, 1. Carbon fiber creel; 11. Carbon fiber filament; 2. Fiber drying oven; 3. Fiber pay-off reel; 31. Red light pen; 32. Fiber; 4. Cylindrical linear glue injection box; 401. Yarn dividing plate 1; 402. Yarn dividing plate 2; 42. Fiber hole; 43. Fiber hole; 44. Glue tank; 45. Vacuum pump; 46. Resin tube; 47. Resin pre-storage box; 48. Liquid level observation tube; 5. Yarn collecting hole; 51. Pre-forming mold; 6. Winding machine; 61. Winding disk; 62. Rotating disk; 7. Curing mold; 71. Water circulation system; 8. Unwinder; 9. Tractor; 10. Cutting machine; 12. Winding machine. DETAILED DESCRIPTION

[0056] The present invention will be further described in detail below with reference to the accompanying drawings.

[0057] This specific embodiment is merely an explanation of the present invention and is not intended to limit the present invention. After reading this specification, those skilled in the art may make non-creative modifications to this embodiment as needed. However, as long as such modifications are within the scope of the claims of the present invention, they are protected by patent law.

[0058] This embodiment provides a device for preparing carbon fiber composite reinforcement for marine engineering, such as Figure 1 As shown, it includes a carbon fiber creel 1, a fiber drying oven 2, an optical fiber pay-off drum 3, a cylindrical linear glue injection box 4, a yarn collecting hole 5, a preforming mold 51, a winding machine 6, a rotating disk 62, a winding disk 61, a curing mold 7, an unwinding machine 8, a traction machine 9, a cutting machine 10, and a winding machine 12, which are arranged in sequence.

[0059] The carbon fiber creel 1 is provided with carbon fiber filaments 11, which take the carbon fiber creel 1 as the starting point and pass through the fiber drying oven 2, the cylindrical linear glue injection box 4, the yarn collecting hole 5, the preforming mold 51, the rotating disk 62, the curing mold 7, the unwinding machine 8, the traction machine 9, the cutting machine 10, and the winding machine 12 in sequence.

[0060] There is an optical fiber 32 on the optical fiber pay-off reel 3. The optical fiber 32 takes the optical fiber pay-off reel 3 as the starting point and passes through the fiber drying oven 2, the cylindrical linear glue injection box 4, the yarn collecting hole 5, the preforming mold 51, the rotating disk 62, the curing mold 7, the unwinding machine 8, the traction machine 9, the cutting machine 10, and the winding machine 12 in sequence.

[0061] A red light pen 31 is provided on the optical fiber payout reel 3 and is connected to the optical fiber 32 for detecting the path of the optical fiber 32. The red light pen 31 can be placed at the front or back end of the optical fiber 32 to monitor the effectiveness of the optical fiber 32 in real time. In other embodiments, the red light pen 31 can be placed on the reel 12.

[0062] The cylindrical straight line glue injection box 4 is transparent and hollow, and its cross section is as follows: Figure 2 As shown, the annular portion stores epoxy resin. The two ends of the cylindrical linear injection box 4 are respectively provided with Figure 3 The yarn separating plate 1 401 and the yarn separating plate 2 402 shown in the figure have a fiber hole 42 at the center thereof, which is connected to the hollow area of ​​the cylindrical linear glue injection box 4; two circles of fiber holes 43 are opened along the circumference of the edge thereof, which are connected to the annular area of ​​the cylindrical linear glue injection box 4.

[0063] A resin pre-storage box 47 and a glue tank 44 are located above and below the cylindrical linear glue injection box 4, respectively. A resin tube 46 is connected to the bottom of the glue tank 44, which in turn is connected to the top of the resin pre-storage box 47. A vacuum pump 45 is connected to the resin tube 46, which transfers the epoxy resin from the glue tank 44 to the resin pre-storage box 47. A liquid level observation tube 48 is connected between the cylindrical linear glue injection box 4 and the resin pre-storage box 47. The resin pre-storage box 47 and the liquid level observation tube 48 above the cylindrical linear glue injection box 4 allow for the adjustment of the amount of glue added based on resin consumption. This ensures a stable resin level within the transparent hollow linear glue injection box, thereby ensuring stability during the carbon fiber composite reinforcement production process.

[0064] The opening of glue tank 44 is located below the cylindrical linear glue injection box 4, the yarn collection hole 5, the preforming mold 51, and the inlet of the curing mold 7. It is used to receive extruded or dripping epoxy resin. The bottom surface of glue tank 44 is slightly angled to ensure that the reflowing epoxy resin is concentrated at the nozzle of resin tube 46. When the vacuum pump 45 is in operation, it can completely remove the reflowing glue liquid to prevent some resin from stagnating.

[0065] The curing mold 7 is 800-1100mm long and is divided into a water-cooling zone and three temperature zones. The water-cooling zone is 100mm long, the first temperature zone is 100mm long, the second temperature zone is 300mm long, and the third temperature zone is 300mm long. The temperature of the curing mold 7 is set according to the curing temperature of the resin glue: the first temperature zone is 140-160°C, the second temperature zone is 150-170°C, and the third temperature zone is 190-210°C. A water circulation system is added to the front end of the curing mold 7 to reduce the temperature of the mold inlet, thereby reducing the resin's thermal aging.

[0066] This specific embodiment also provides a method for preparing carbon fiber composite reinforcement for marine engineering, comprising the following steps:

[0067] Step 1: Add 5-10 parts of a specialty polyether polymer with active hydroxyl groups, 1-2 parts of a mixed solution containing a synthetic resin, a glyceride, an organic acid derivative, and an organic phosphate copolymer, and 0.5-1 parts of a foam-breaking polymer and a polysiloxane solution to 105 parts of an epoxy curing agent and stir for 3-5 minutes. Then, add 100 parts of epoxy resin and stir for another 10 minutes. After standing for 10 minutes, pour the mixture into a transparent hollow cylindrical linear injection box (4). This produces a modified, high-toughness, high-temperature epoxy resin system. When combined with carbon fiber filaments, the resulting composite material exhibits significantly improved flexural and fatigue properties.

[0068] Step 2: The carbon fiber filaments 11 are drawn from the carbon fiber creel 1 and enter the fiber drying oven 2, which is set at a temperature of 140-220°C. The optical fiber pay-off reel 3 is placed between the fiber drying oven 2 and the transparent hollow cylindrical linear glue injection box 4, with the optical fiber 32 under tension. After exiting the fiber drying oven 2, the carbon fiber filaments 11 and the optical fiber 32 pass through the first yarn splitter 401. The optical fiber 32 passes through the optical fiber hole 42 in the middle of the first yarn splitter 401 and exits through the optical fiber hole 42 of the second yarn splitter 402. The carbon fiber filaments 11 pass through the fiber holes 43 around the outer periphery of the first yarn splitter 401 and enter the cylindrical linear glue injection box 4. Then, the carbon fiber filaments 11 are drawn from the second yarn splitter 402 and converge with the optical fiber 32 at the yarn collection hole 5 to form a fiber bundle. The fiber bundle is then passed through the preforming die 51 for glue extrusion. Adding the preforming step after the yarn collection hole 5 further regularizes the fiber shape and serves to squeeze out excess glue, squeezing out excess glue and reducing the glue extrusion pressure at the die mouth of the curing die 7. The carbon fiber filaments 11 are baked in the fiber oven 2, which can volatilize part of the impregnating agent in the carbon fiber. After being impregnated with resin, the binding property of the carbon fiber filaments 11 with the resin can be improved, thereby improving the compression and bending properties of the carbon fiber composite material tendons. Optical fiber 32 is added to the carbon fiber composite material tendons, and the stress, strain, temperature and other parameters of the composite material are monitored in real time through the optical fiber 32 sensing technology. A 0.5-1.5mm optical fiber hole 42 is reserved in the center of the yarn splitting plate 1 401 and the yarn splitting plate 2 402. The optical fiber 32 passes through it with a certain tension, and then converges with the carbon fiber filaments 11 at the yarn collecting hole 5, which can ensure that the optical fiber 32 remains absolutely centered in the carbon fiber composite material tendons to ensure the stability of the optical fiber 32 detection data. Evenly open two circles of fiber holes 43 on the sides of the yarn splitting plate 1 401 and the yarn splitting plate 2 402, and use them in conjunction with the cylindrical linear glue injection box 4. First, the problem of hairiness caused by bending of the carbon fiber filaments and loss of mechanical properties is reduced. Secondly, the cylindrical linear glue injection box 4 has a hollow center. This significantly reduces the amount of resin used, essentially ensuring that the resin is always fresh. This eliminates the problem of resin aging and increased viscosity caused by the low amount of glue used and the repeated circulation during the pultrusion process, which affects the resin's ability to penetrate the fibers and, in turn, the Tg and mechanical properties of the carbon fiber composite reinforcement. Using this production process, the pultrusion speed can be increased from 300 mm / min to 700 mm / min.

[0069] Step 3: The fiber bundle then passes through the center of the rotating disk 62 and is prepared as follows: Figure 4 When the threaded rib is formed, winding machine 6 begins to work, wrapping the embossed tape around the fiber bundle surface. By adjusting the thickness and width of the embossed tape, the embossing depth and width of the high-toughness optical fiber 32 intelligent carbon fiber composite rib are controlled. By adjusting the motor frequency of winding machine 6, the pitch of the embossed rib is controlled. By controlling the angle of winding disc 61, the embossed tape is aligned with the fiber bundle axis at an angle α, with a range of 50-70°.

[0070] Step 4: The fiber bundle with the embossed tape wrapped around its surface is pulled into the curing mold 7 by the traction machine 9 for curing. It can be shaped into a high-toughness optical fiber intelligent carbon fiber composite reinforcement with continuous threads on the surface. The fiber bundle and the embossed tape wrapped around its surface enter the curing mold 7 together, are in close contact with the curing mold 7, and are cured and formed in the mold. The product after demolding is consistent with the mold cross-section, with standard size and high precision, which is different from traditional composite material threaded reinforcement.

[0071] Step 5: After the high-toughness fiber-optic intelligent carbon fiber composite material reinforcement with continuous threaded surfaces is completely cured through the curing mold 7, it passes through the unwinder 8 to unwind the embossed tape wrapped around the reinforcement surface when entering the mold. The embossed tape is added before entering the mold and removed after curing. The carbon fiber reinforcement is only slightly bent, but not damaged, and the tensile strength and modulus are not greatly reduced. The fiber can also be tightly squeezed with the curing mold 7 and is completely cured after leaving the mold, making the prepared reinforcement more accurate in size. The reinforcement with the embossed tape removed passes through the tractor 9 and is transferred to the cutting machine 10 under the action of the tractor 9. The reinforcement is cut to a fixed length or reeled through the reel 12. A red light pen 31 is connected to the optical fiber pay-off reel 3 and connected to the optical fiber 32, so that the optical fiber 32 path can be detected at any time.

[0072] Embossed tape is added before the carbon fiber bundle enters the curing mold 7 and removed after complete curing. This leaves a uniform indentation on the surface of the carbon fiber composite reinforcement. The fibers only bend slightly during the molding process, which has little impact on product performance. However, the uniform indentation significantly improves the bonding strength with anchoring materials such as concrete. This solves the problem of connecting to anchoring materials such as concrete without sacrificing the excellent performance of the carbon fiber. Furthermore, the fibers are tightly pressed against the curing mold 7, fully curing upon exiting the mold, resulting in a more precise composite reinforcement.

[0073] When it is necessary to produce smooth round ribs (i.e. ribs without threads on the surface), it is only necessary to stop the winding machine 6 and add 2-5 carbon fibers to the carbon fiber creel 1 for filling.

[0074] The glue squeezed out from the inlet of the curing mold 7 and the glue flowing out from the front and rear yarn dividing plate 1 401 and the yarn dividing plate 2 402 of the cylindrical linear glue injection box 4 flow into the glue tank 44 below. The resin in the glue tank 44 is pumped into the resin pre-storage box 47 by the vacuum pump 45. The remaining glue in the transparent hollow cylindrical linear glue injection box 4 can be observed in real time through the liquid level observation tube 48 connected to the transparent hollow cylindrical linear glue injection box 4.

[0075] The modified high-toughness high-temperature epoxy resin ratio scheme disclosed in this embodiment is compared with the conventional high-temperature epoxy resin scheme. The high-toughness high-temperature epoxy resin ratio scheme used is as follows:

[0076] Option 1: Add 5 parts of a specialty polyether polymer with active hydroxyl groups, 1 part of a mixed solution containing a synthetic resin, glyceride, organic acid derivative, and organophosphate copolymer, and 0.5 parts of a foam-breaking polymer and polysiloxane solution to a high-temperature epoxy curing agent. Mix thoroughly before adding the high-temperature epoxy resin. This yields a modified, high-toughness, high-temperature epoxy resin system.

[0077] Option 2: Add 8 parts of a specialty polyether polymer with active hydroxyl groups, 1.5 parts of a mixed solution containing a synthetic resin, glyceride, organic acid derivative, and organophosphate copolymer, and 0.8 parts of a foam-breaking polymer and polysiloxane solution to the high-temperature epoxy curing agent. Mix thoroughly before adding the high-temperature epoxy resin. This yields a modified, high-toughness, high-temperature epoxy resin system.

[0078] Option 3: Add 10 parts of a specialty polyether polymer with active hydroxyl groups, 2 parts of a mixed solution containing a synthetic resin, glyceride, organic acid derivative, and organophosphate copolymer, and 1 part of a foam-breaking polymer and polysiloxane solution to a high-temperature epoxy curing agent. Mix thoroughly before adding the mixture to the high-temperature epoxy resin. This yields a high-temperature modified, high-toughness epoxy resin system.

[0079] The experimental data are as follows:

[0080]

[0081] Analyzing the data in the above table, we can see that:

[0082] 1. The carbon fiber composite reinforcement made of modified high-toughness high-temperature epoxy resin has significantly reduced porosity, significantly improved bending performance and tensile fatigue performance, and other conventional mechanical properties;

[0083] 2. As the amount of modifying additives added increases, Tg and compression force begin to decrease, and fatigue performance improves;

[0084] 3. The carbon fiber composite reinforcement made of high-toughness and high-temperature epoxy resin modified by Scheme 2 has the best performance.

[0085] The preparation device in the prior art is as follows Figure 5 As shown, the main difference between the device disclosed in this specific embodiment and the device is that a fiber oven 2 is added to the device, and a cylindrical linear glue injection box 4 is adopted; while the prior art does not have a fiber oven 2, and the glue injection equipment used is generally a V-shaped glue dipping tank 44.

[0086] Experiments were conducted using the preparation device in the prior art and the present preparation device, and the experimental results are as follows:

[0087]

[0088] Analyzing the data in the above table, we can see that:

[0089] 1. The carbon fiber composite reinforcement made by using the cylindrical linear injection box 4 has significantly improved Tg performance and greatly reduced fiber fluff. The pultrusion speed can be increased without reducing performance.

[0090] 2. The carbon fiber composite reinforcement made by using the cylindrical linear injection box 4 has improved mechanical properties and fatigue properties;

[0091] 3. The carbon fiber composite reinforcement produced by the fiber-free oven 2 has a high porosity, and low compression force, bending performance, and fatigue performance.

Claims

1. A device for preparing carbon fiber composite reinforcement for marine engineering, characterized in that: The invention comprises a carbon fiber creel (1), a glue injection device, a yarn collecting hole (5), a preforming mold (51), a winding device, a curing mold (7), an unwinding machine (8), a traction machine (9), a cutting machine (10), and a winding machine (12). The winding device comprises a winding machine (6), a rotating disk (62), and a winding disk (61). A fiber drying oven (2) for the carbon fiber filaments (11) to pass through is provided between the carbon fiber creel (1) and the glue injection device; An optical fiber pay-off reel (3) is provided between the fiber drying oven (2) and the glue injection device; The glue injection device is a cylindrical linear glue injection box (4), the top of which is connected to a resin pre-storage box (47), and the two ends of which are respectively connected to a yarn separation plate 1 (401) and a yarn separation plate 2 (402), wherein the middle of the yarn separation plate 1 (401) and the yarn separation plate 2 (402) are provided with a fiber hole (42), and the edge is provided with a fiber hole (43) circumferentially.

2. The device for preparing carbon fiber composite reinforcement for marine engineering according to claim 1, characterized in that: A liquid level observation tube (48) is connected between the resin pre-storage box (47) and the cylindrical linear glue injection box (4).

3. The device for preparing carbon fiber composite reinforcement for marine engineering according to claim 2, characterized in that: A glue groove (44) is provided below the cylindrical linear glue injection box (4), the opening of the glue groove (44) is upward and is located below the entrance of the cylindrical linear glue injection box (4), the yarn collecting hole (5), the preforming mold (51), the winding device, and the curing mold (7), the glue groove (44) is connected to a resin tube (46), the end of the resin tube (46) is connected to the resin pre-storage box (47), and the resin tube (46) is connected to a vacuum pump (45).

4. The device for preparing carbon fiber composite reinforcement for marine engineering according to claim 3, characterized in that: The resin tube (46) is connected to the bottom of the glue groove (44), and the bottom surface of the glue groove (44) is inclined downward near the tube opening of the resin tube (46).

5. The device for preparing carbon fiber composite reinforcement for marine engineering according to claim 1, characterized in that: The curing mold (7) has a length of 800 mm and is divided into a water cooling area and three temperature areas, wherein the water cooling area is 100 mm long, the first temperature area is 100 mm long, the second temperature area is 300 mm long, and the third temperature area is 300 mm long.

6. The device for preparing carbon fiber composite reinforcement for marine engineering according to claim 1, characterized in that: A water circulation system (71) is provided at the front end of the curing mold (7).

7. A method for preparing carbon fiber composite reinforcement for marine engineering, characterized in that: Using the preparation device according to any one of claims 1 to 6, comprising the following steps: Step 1: Pour epoxy resin into the cylindrical linear injection box (4); Step 2: The carbon fiber filaments (11) are drawn out from the carbon fiber creel (1) and enter the fiber oven (2), and the temperature of the fiber oven (2) is set at 140-220°C; after the carbon fiber filaments (11) are drawn out from the fiber oven (2), they pass through the first yarn splitting plate (401) together with the optical fiber (32), and the carbon fiber filaments (11) pass through the fiber hole (43) outside the yarn splitting plate (401) and enter the cylindrical linear glue injection box, and then are drawn out from the second yarn splitting plate (402), and the optical fiber (32) passes through the middle fiber hole (42) of the yarn splitting plate (401) and is drawn out from the fiber hole (42) of the second yarn splitting plate (402). The carbon fiber filaments (11) and the optical fiber (32) converge into the yarn collecting hole (5) to form a fiber bundle, and then pass through the preforming mold (51) for glue extrusion; Step 3: The fiber bundle then passes through the center of the rotating disk (62), and the winding machine (6) starts to work, winding the embossed tape on the surface of the fiber bundle; by adjusting the thickness and width of the wound embossed tape, the embossing depth and embossing width of the high-toughness optical fiber intelligent carbon fiber composite material reinforcement are controlled; by adjusting the motor frequency of the winding machine (6), the pitch of the embossing on the surface of the reinforcement is controlled; by controlling the angle of the winding disk (61), the direction of the embossed tape is adjusted to form an angle α with the axis direction of the fiber bundle, and the value range of α is 50-70°; Step 4: The fiber bundle with the embossed tape wrapped around its surface is pulled into a curing mold (7) by a traction machine (9) for curing, and is shaped into a high-toughness optical fiber intelligent carbon fiber composite material rib with continuous threads on its surface; Step 5: After the high-toughness optical fiber intelligent carbon fiber composite material reinforcement with continuous threads on the surface is completely cured by the curing mold (7), the embossed tape is wound off by the unwinding machine (8), and the composite material reinforcement with the embossed tape torn off is transported to the cutting machine (10) under the action of the traction machine (9) to cut the composite material reinforcement to a fixed length or to be wound by the winding machine (12).

8. The method for preparing a carbon fiber composite reinforcement for marine engineering according to claim 7, characterized in that: When it is necessary to produce smooth round ribs, the winding machine (6) and the unwinding machine (8) are stopped, and 2-5 carbon fibers are added to the carbon fiber creel (1) for filling.

Images