Intelligent fiber reinforced thermoplastic resin rib material and preparation method thereof

Abstract

The invention discloses an intelligent fiber-reinforced thermoplastic resin rib material and a preparation method thereof. The intelligent fiber reinforced thermoplastic resin rib material comprises a monitoring optical fiber, a continuous fiber woven sleeve and a continuous fiber reinforced thermoplastic resin prepreg winding layer, wherein the continuous fiber woven sleeve and the continuous fiber reinforced thermoplastic resin prepreg winding layer are sequentially arranged from inside to outside in the radial direction of the monitoring optical fiber. The fiber woven sleeve and the continuous fiber reinforced thermoplastic resin prepreg winding layer are bonded into a whole through a thermoplastic film sleeve wrapping the continuous fiber woven sleeve when the intelligent fiber reinforced thermoplastic resin rib material is subjected to hot melting; the monitoring optical fiber is wrapped by the continuous fiber braided sleeve, so that the melt of the thermoplastic film sleeve flowing into the continuous fiber braided sleeve is reduced, and the melt flowing into the continuous fiber braided sleeve is absorbed. According to the intelligent fiber-reinforced thermoplastic resin rib material, secondary processing does not need to be carried out on the surface or the interior of the rib material, and the body mechanical property of the rib material cannot be damaged. The preparation process is simple, the cost is controllable, and the survival rate of the optical fiber is high.

Description

Technical Field

[0001] The invention relates to an intelligent fiber-reinforced thermoplastic resin reinforcement material and a preparation method thereof, and belongs to the field of composite material preparation. Background Art

[0002] Health detection of structural materials and structures has always been an important research and development direction in the field of civil engineering. The use of smart reinforcement can conveniently and efficiently detect the internal stress conditions of the structure, and has great prospects for engineering applications. At present, there are mainly the following preparation methods for smart reinforcement: (1) Surface grooving type, that is, the surface of the reinforcement is grooved by grinding and other processes, and the optical fiber used for monitoring is placed in the groove, and encapsulated with colloids such as epoxy resin; (2) Axial punching type: the reinforcement is perforated by laser perforation and other methods, and then the optical fiber is inserted from the axial hole and encapsulated with colloid; (3) Surface winding type: The optical fiber is wound on the surface of the reinforcement and fixed with colloid. However, these methods still have shortcomings. For surface grooving and axial drilling, the biggest problem is that it will damage the reinforcement body and cause the mechanical properties to decrease; and the laser axial drilling technology is difficult, costly, and has a low optical fiber survival rate, which is not conducive to large-scale promotion. When the optical fiber is wound by winding, because the optical fiber itself is very fragile and has low shear strength, it is very easy to be damaged. Generally, it needs to be wound manually, which will cause uneven fiber winding. Therefore, there is an urgent need for a simple, efficient and low-cost smart tendon. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide an intelligent fiber reinforced thermoplastic resin reinforcement material and a preparation method thereof which has high optical fiber survival rate, low cost and is easy to produce.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0005] The present invention first provides a monitoring optical fiber and a continuous fiber braided sleeve, an adhesive layer and a continuous fiber reinforced thermoplastic resin prepreg winding layer arranged in sequence from the inside to the outside along the radial direction of the monitoring optical fiber: the monitoring optical fiber is used to realize intelligent detection; the adhesive layer is used to connect the fiber braided sleeve and the continuous fiber reinforced thermoplastic resin prepreg winding layer, and the adhesive layer is formed by a thermoplastic film sleeve wrapped on the continuous fiber braided sleeve when the intelligent fiber reinforced thermoplastic resin reinforcement is hot-melted. When the intelligent fiber reinforced thermoplastic resin reinforcement is hot-melt-formed, the thermoplastic film melts, and the melt flows, a part of which flows into the fiber braided sleeve, and a part of which is integrated with the resin in the continuous fiber reinforced thermoplastic resin prepreg winding layer; the continuous fiber braided sleeve is wrapped on the monitoring optical fiber, and is used to reduce the flow of the thermoplastic film sleeve melt into the continuous fiber braided sleeve when the intelligent fiber reinforced thermoplastic resin reinforcement is hot-melt-formed, and absorb the flowing melt.

[0006] The inner diameter of the fiber braided sleeve is 0.2-0.5 mm; the inner diameter of the thermoplastic film sleeve is 0.1-0.2 mm larger than the outer diameter of the fiber braided sleeve. The thickness of the continuous fiber braided sleeve is 0.1-0.3 mm; the thickness of the thermoplastic film sleeve is 0.05-0.2 mm.

[0007] The fibers in the fiber braided sleeve are consistent with the fibers in the continuous fiber reinforced thermoplastic resin prepreg winding layer; the material of the thermoplastic film sleeve should be consistent with the thermoplastic resin matrix in the continuous fiber reinforced thermoplastic resin prepreg winding layer.

[0008] The present invention also provides a method for preparing an intelligent fiber-reinforced thermoplastic resin reinforcement material, comprising:

[0009] Step 1: insert the monitoring optical fiber into the continuous fiber braided sleeve along the axis, and cover the continuous fiber braided sleeve with a thermoplastic film sleeve to form an inner core;

[0010] Step 2: With the inner core as the axis, a wide-width fiber-reinforced thermoplastic resin prepreg is tightly wound on the inner core to form a wide-width fiber-reinforced thermoplastic resin prepreg winding layer, and the winding is stopped until the diameter reaches 1.05-1.1 times of the preset composite fiber reinforcement diameter to form a wound reinforcement material;

[0011] Step 3: Molding the coiled reinforcement to obtain the final composite reinforcement.

[0012] In step 2, the thickness of the wide-width fiber-reinforced thermoplastic resin prepreg winding layer formed by winding is 0.3-0.5 mm.

[0013] Step 2 is carried out in a vacuum environment; vacuum suction is performed on both sides of the wide-width fiber-reinforced thermoplastic resin prepreg near the inner core to remove dust and impurities on the surface of the prepreg, ensure the pressure difference balance on both sides of the wide-width fiber-reinforced thermoplastic resin prepreg, so that the wide-width fiber-reinforced thermoplastic resin prepreg can be kept flat at all times, and the winding density is improved.

[0014] The intelligent fiber reinforced thermoplastic resin reinforcement material of the present invention adopts wide-width fiber reinforced thermoplastic resin prepreg, and uses the inner core as the axis to tightly wind the prepreg until it reaches 1.05-1.1 times the preset fiber reinforcement diameter. The larger width of the wide-width fiber reinforced thermoplastic resin prepreg allows the realization of the winding process, and at the same time, reinforcements with larger diameters can be prepared to meet engineering applications. The thickness of the prepreg is 0.3-0.5mm. Because the thickness of the prepreg is too small, the convolution efficiency is low, and the possibility of voids and impurities increases; if the thickness of the prepreg is too large, the prepreg is not easy to roll tightly, and voids are also likely to appear inside the reinforcement.

[0015] If the optical fiber is directly used as the inner core and the wide prepreg is wound, the optical fiber is very fragile and the prepreg contacts the optical fiber during the winding process, which may cause bending damage to the optical fiber; in the subsequent molding process, the thermoplastic resin flows and forms adhesion with the optical fiber, causing the optical fiber to fail. Therefore, the present invention uses a thermoplastic film sleeve wrapped outside the fiber braided sleeve as protection. The fiber braided sleeve has good flexibility, which avoids the bending damage that may be caused by direct contact between the fiber and the rigid body. Even under high temperature and high pressure, the resin in the prepreg flows, and the fiber braided sleeve prevents most of the resin from flowing in, which plays a good protective role for the optical fiber; the external thermoplastic film has a certain rigidity and can play a shaping role, avoiding large bending and overlapping between the fiber braided sleeve and the optical fiber during the winding process; under high temperature and high pressure, the thermoplastic film melts, and the melt flows, a part of which flows into the fiber braided sleeve, and a part of which is integrated with the outer thermoplastic resin matrix, which plays a good connection role between the fiber braided sleeve and the outer thermoplastic prepreg. To achieve this goal, the inner diameter of the inner core fiber braided sleeve should be 0.2-0.5mm, the inner diameter of the thermoplastic film sleeve should be 0.1-0.2mm larger than the outer diameter of the fiber braided sleeve, the thickness of the continuous fiber braided sleeve is 0.1-0.3mm; the thickness of the thermal film sleeve is 0.05-0.2mm. If the diameter of the inner core fiber braided sleeve is too small, it is easy to damage the fiber during the insertion of the optical fiber; if the diameter of the inner core fiber braided sleeve is too large, a large gap will be left in the center of the final prepared reinforcement material, and the mechanical properties of the reinforcement material will decrease. If the diameter of the thermoplastic film sleeve is too small, the fiber braided sleeve is difficult to penetrate; if the diameter of the thermoplastic film sleeve is too large, the resin flow is not enough to fill the gap between the braided sleeve and the film sleeve during the subsequent molding process, resulting in gaps in the core of the reinforcement material and a decrease in the mechanical properties of the core material. If the wall thickness of the thermoplastic film sleeve is too large, it cannot be fully melted when heated, resulting in internal defects in the core material.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The invention is used to prepare intelligent fiber-reinforced thermoplastic resin reinforcements, and no secondary processing is required on the surface or inside of the reinforcements, and the mechanical properties of the reinforcements themselves will not be damaged. The preparation process of the invention is simple, cost-controllable, and has a high fiber survival rate. The reinforcements are highly designable, and the prepared reinforcements have good mechanical properties and monitoring performance, which can meet the needs of engineering applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a cross-sectional view of the reinforcing bar of the present invention;

[0019] Figure 2 is a cross-sectional view of the reinforcement material of the present invention before molding;

[0020] Figure 3 It is a schematic diagram of the preparation principle of the reinforcement material of the present invention.

[0021] Among them, 1 is a wide-width prepreg; 2 and 3 are vacuum extraction devices respectively; 4 and 6 are the same rollers, 5 is the inner core of the composite reinforcement material; 10 is the monitoring optical fiber; 20 is the continuous fiber braided sleeve; 30 is the thermoplastic film sleeve; 40 is the continuous fiber reinforced thermoplastic resin prepreg winding layer. DETAILED DESCRIPTION

[0022] The present invention will be described in detail below in conjunction with the accompanying drawings:

[0023] Embodiment 1:

[0024] A smart fiber reinforced thermoplastic resin reinforcement material, such as Figure 1-Figure 2 As shown, it is composed of an inner core and an outer layer bonded together. The inner core is the monitoring optical fiber 10 and its sheath, and the sheath is a continuous basalt fiber braided sleeve 20; the outer layer is a continuous fiber reinforced thermoplastic resin prepreg winding layer 40. The bonding of the inner core and the outer layer is achieved by the thermoplastic film sleeve 30 sleeved on the continuous basalt fiber braided sleeve 20 when the smart fiber reinforced thermoplastic resin reinforcement material is hot-melted. The thermoplastic film sleeve 30 melts, and the melt flows, a part of which flows into the continuous basalt fiber braided sleeve 20, and a part of which is integrated with the resin in the continuous fiber reinforced thermoplastic resin prepreg winding layer 40.

[0025] In this embodiment, the continuous fiber reinforced thermoplastic resin prepreg winding layer 40 is a 0.3 mm thick continuous basalt fiber reinforced hot HDPE prepreg winding layer. The thermoplastic film sleeve 30 is a HDPE film sleeve. The inner diameter of the basalt fiber braided sleeve is 0.3 mm and the thickness is 0.1 mm, and the inner diameter of the thermoplastic film sleeve is 0.5 mm and the thickness is 0.1 mm. The HDPE film sleeve is converted into a bonding layer during the thermoforming process, which is used to connect the continuous basalt fiber braided sleeve and the continuous basalt fiber reinforced hot HDPE prepreg winding layer.

[0026] Schematic diagram of the preparation of smart fiber reinforced thermoplastic resin reinforcement Figure 3 As shown. The wide prepreg 1 is used to wrap the smart reinforcement; the vacuum equipment 2 and the vacuum equipment 3 are used to: remove the dust and impurities on the surface of the prepreg; ensure that the pressure difference on both sides of the prepreg is balanced and the prepreg is kept flat at all times; the roller 4, the composite reinforcement core 5, and the roller 6 core are located in a straight line, and the rotation directions of rollers 4 and 6 are the same, and the rotation direction of the composite reinforcement core 5 is opposite to that of rollers 4 and 6. As the winding proceeds, that is, as the diameter of the composite reinforcement core 5 increases, rollers 4 and 6 move the same distance away from the composite reinforcement core 5, respectively, to ensure that the distance between the two rollers is 1-1.05 times that of the smart reinforcement in the current state, which produces a preliminary compaction effect on the reinforcement, while also ensuring that the reinforcement will not be eccentric. The entire process is carried out in a vacuum chamber.

[0027] Under vacuum, the monitoring optical fiber is inserted into the fiber braided sleeve along the axis, and then the film sleeve is coated on the outside of the fiber braided sleeve as the inner core, which is placed on the operating frame. Wide-width basalt fiber reinforced HDPE prepreg is used, and the inner core is used as the axis. Under the operating conditions of vacuuming the front and back sides of the wide-width basalt fiber reinforced HDPE prepreg, the prepreg is tightly wound. The volume fraction of the fiber in the wide-width prepreg is 45%. After reaching 1.05 times the preset diameter, the smart ribs are removed and the final composite ribs are prepared by molding at a high temperature and high pressure environment of 220°C and 12Mpa. This embodiment plans to prepare ribs with a diameter of φ8mm. After molding, the diameter of the ribs is φ8±0.2mm, with good dimensional stability, high mechanical strength and stable performance, which is 720±20Mpa. Because of the protection of the bonding layer formed by the fiber braided sleeve and the thermoplastic film sleeve, the optical fiber survival rate is 100%.

[0028] The diameter of the prepreg material should be 1.05-1.1 times of the preset diameter. This is because there are inevitably gaps in the winding process. If the winding is stopped as soon as the preset diameter is reached, the diameter of the reinforcement material after molding will not reach the preset size. If the diameter of the coil is too large, the size after molding will be too large. The fiber of the wide-width prepreg can be high-performance fiber such as carbon fiber, glass fiber, basalt fiber, aramid fiber, etc. The resin matrix can be high-performance resins such as PSI and PEEK, or general resins such as PP, PE, PA, etc.

[0029] The volume fraction of fiber in wide width prepreg is 40-70%.

[0030] Comparative Example 1:

[0031] A smart fiber reinforced thermoplastic resin reinforcement material, such as Figure 1-Figure 2 As shown, it is composed of an inner core and an outer layer bonded together. The inner core is the monitoring optical fiber 10 and its sheath, and the sheath is a continuous basalt fiber braided sleeve 20; the outer layer is a continuous fiber reinforced thermoplastic resin prepreg winding layer 40. The bonding of the inner core and the outer layer is achieved by the thermoplastic film sleeve 30 sleeved on the continuous basalt fiber braided sleeve 20 when the smart fiber reinforced thermoplastic resin reinforcement material is hot-melted. The thermoplastic film sleeve 30 melts, and the melt flows, a part of which flows into the continuous basalt fiber braided sleeve 20, and a part of which is integrated with the resin in the continuous fiber reinforced thermoplastic resin prepreg winding layer 40.

[0032] In this embodiment, the inner diameter of the basalt fiber braided sleeve is 0.3 mm and the thickness is 0.2 mm, and the inner diameter of the thermoplastic film sleeve is 1 mm and the thickness is 0.1 mm. The thickness of the continuous basalt fiber reinforced hot HDPE prepreg winding layer is 0.3 mm.

[0033] In a vacuum environment, the monitoring optical fiber is inserted into the fiber braided sleeve along the axis, and then the film sleeve is covered on the outside of the fiber braided sleeve as the inner core, which is placed on the operating frame. Wide-width basalt fiber reinforced HDPE prepreg is used, and the inner core is used as the axis. Under the operating conditions of vacuuming the front and back sides of the wide-width basalt fiber reinforced HDPE prepreg, the prepreg is tightly wound. The volume fraction of the fiber in the wide-width prepreg is 45%. After reaching 1.05 times the preset diameter, the smart rib is removed. The final composite rib is prepared by molding under high temperature and high pressure.

[0034] The reinforcement prepared by the above method is prone to sleeve folding during the preparation process because the size of the inner core HDPE film sheath is much larger than the basalt fiber braided sleeve. There are gaps inside the reinforcement after molding, and the mechanical properties of the reinforcement are low and the stability is poor. The tensile strength of the φ8mm basalt fiber reinforced HDPE reinforcement is only 220±50Mpa.

[0035] Comparative Example 2:

[0036] A smart fiber reinforced thermoplastic resin reinforcement material, such as Figure 1-Figure 2 As shown, it is composed of an inner core and an outer layer bonded together. The inner core is the monitoring optical fiber 10 and its sheath, and the sheath is a continuous basalt fiber braided sleeve 20; the outer layer is a continuous fiber reinforced thermoplastic resin prepreg winding layer 40. The bonding of the inner core and the outer layer is achieved by the thermoplastic film sleeve 30 sleeved on the continuous basalt fiber braided sleeve 20 when the smart fiber reinforced thermoplastic resin reinforcement material is hot-melted. The thermoplastic film sleeve 30 melts, and the melt flows, a part of which flows into the continuous basalt fiber braided sleeve 20, and a part of which is integrated with the resin in the continuous fiber reinforced thermoplastic resin prepreg winding layer 40.

[0037] The outer layer is a 0.3mm thick continuous basalt fiber reinforced hot HDPE prepreg winding layer. The inner diameter of the basalt fiber braided sleeve is 0.3mm and the thickness is 0.1mm. The inner diameter of the thermoplastic film sleeve is 0.5mm and the thickness is 0.1mm.

[0038] In a vacuum environment, the optical fiber is inserted into the fiber braided sleeve along the axis, and then the film sleeve is covered on the outside of the fiber braided sleeve as the inner core, which is placed on the operating frame. Wide-width basalt fiber reinforced HDPE prepreg is used, and the inner core is used as the axis to tightly wind the prepreg without vacuuming. No vacuum equipment is used during the winding process, and the dust on both sides of the prepreg surface is removed, and no pressure difference balance is performed, so that the prepreg always remains in a certificate state. The volume fraction of the fiber in the wide-width prepreg is 45%. After reaching 1.05 times the preset diameter, the smart rib is removed. The final composite rib is prepared by molding under high temperature and high pressure.

[0039] This embodiment plans to prepare reinforcement with a diameter of φ8mm. Due to the lack of a vacuum extraction device, the winding density is poor, and the prepreg is uneven during the preparation process, causing wrinkles in some areas. After molding, the diameter of the prepreg reinforcement is only 7.2±0.2mm, which does not meet the requirements. At the same time, some reinforcements have large defects inside due to wrinkles, and the mechanical strength of the reinforcement is about 430±70Mpa.

[0040] Comparative Example 3:

[0041] A smart fiber reinforced thermoplastic resin reinforcement material, such as Figure 1-Figure 2 As shown, it is composed of an inner core and an outer layer bonded together. The inner core is the monitoring optical fiber 10 and its sheath, and the sheath is a continuous basalt fiber braided sleeve 20; the outer layer is a continuous fiber reinforced thermoplastic resin prepreg winding layer 40. The bonding of the inner core and the outer layer is achieved by the thermoplastic film sleeve 30 sleeved on the continuous basalt fiber braided sleeve 20 when the smart fiber reinforced thermoplastic resin reinforcement material is hot-melted. The thermoplastic film sleeve 30 melts, and the melt flows, a part of which flows into the continuous basalt fiber braided sleeve 20, and a part of which is integrated with the resin in the continuous fiber reinforced thermoplastic resin prepreg winding layer 40.

[0042] In this embodiment, the continuous fiber reinforced thermoplastic resin prepreg winding layer 40 is a 1 mm thick continuous basalt fiber reinforced hot HDPE prepreg winding layer. The inner diameter of the basalt fiber braided sleeve is 0.3 mm and the thickness is 0.1 mm. The inner diameter of the thermoplastic film sleeve is 0.5 mm and the thickness is 0.1 mm.

[0043] In a vacuum environment, the optical fiber is inserted into the fiber braided sleeve along the axis, and then the film sleeve is covered on the outside of the fiber braided sleeve as the inner core, which is placed on the operating frame. A wide-width basalt fiber reinforced HDPE prepreg is used, and the inner core is used as the axis. Under the operating conditions of vacuuming the front and back sides of the wide-width basalt fiber reinforced HDPE prepreg, the prepreg is tightly wound. The volume fraction of the fiber in the wide-width prepreg is 45%. After reaching 1.05 times the preset diameter, the smart ribs are removed, and the molding method is used to prepare the final composite ribs under high temperature and high pressure. This embodiment plans to prepare ribs with a diameter of φ8mm. Due to the large thickness of the prepreg, the layers are not tightly fitted during the convolution process, and large gaps appear inside the final ribs. The mechanics of the ribs are low and the stability is poor, about 400±56Mpa.

[0044] Comparative Example 4:

[0045] An intelligent fiber-reinforced thermoplastic resin reinforcement material, consisting of an inner core and an outer layer. The inner core is a monitoring optical fiber 10 and its sheath, and the sheath is a continuous basalt fiber braided sleeve 20; the outer layer is a continuous fiber-reinforced thermoplastic resin prepreg winding layer 40. The outer layer is a 0.3mm thick continuous basalt fiber reinforced hot HDPE prepreg. The inner diameter of the basalt fiber braided sleeve is 0.3mm and the thickness is 0.1mm.

[0046] In a vacuum environment, the optical fiber is inserted into a fiber braided sleeve along the axis as the inner core and placed on an operating frame. A wide-width basalt fiber reinforced HDPE prepreg is used, and the inner core is used as the axis. Under the operating conditions of vacuuming the front and back sides of the wide-width basalt fiber reinforced HDPE prepreg, the prepreg is tightly wound. The volume fraction of the fiber in the wide-width prepreg is 45%. After reaching the preset diameter, the smart ribs are removed, and the final composite ribs are prepared by molding under high temperature and high pressure. This embodiment plans to prepare ribs with a diameter of φ8mm. After compression molding, the diameter of the ribs is φ8±0.2mm, with good dimensional stability, high and stable tensile strength of 720±20MPa. However, due to the lack of protection of the thermoplastic film, the optical fiber survival rate is low, only 40%.

[0047] Comparative Example 5:

[0048] A smart fiber reinforced thermoplastic resin reinforcement material, such as Figure 1-Figure 2 As shown, it is composed of an inner core and an outer layer bonded together. The inner core is the monitoring optical fiber 10 and its sheath, and the sheath is a continuous basalt fiber braided sleeve 20; the outer layer is a continuous fiber reinforced thermoplastic resin prepreg winding layer 40. The bonding of the inner core and the outer layer is achieved by the thermoplastic film sleeve 30 sleeved on the continuous basalt fiber braided sleeve 20 when the smart fiber reinforced thermoplastic resin reinforcement material is hot-melted. The thermoplastic film sleeve 30 melts, and the melt flows, a part of which flows into the continuous basalt fiber braided sleeve 20, and a part of which is integrated with the resin in the continuous fiber reinforced thermoplastic resin prepreg winding layer 40.

[0049] The outer layer is 0.3mm thick continuous basalt fiber reinforced hot HDPE prepreg. The inner diameter of the thermoplastic film sleeve is 0.3mm and the thickness is 0.1mm.

[0050] Under vacuum, the optical fiber is inserted into the fiber braided sleeve along the axis, and then the film sleeve is coated on the outside of the fiber braided sleeve as the inner core, which is placed on the operating frame. A wide-width basalt fiber reinforced HDPE prepreg is used, and the inner core is used as the axis. Under the operating conditions of vacuuming the front and back sides of the wide-width basalt fiber reinforced HDPE prepreg, the prepreg is tightly wound. The volume fraction of the fiber in the wide-width prepreg is 45%. After reaching the preset diameter, the smart ribs are removed, and the final composite ribs are prepared by molding under high temperature and high pressure. This embodiment plans to prepare ribs with a diameter of φ8mm. After molding, the rib diameter is φ8±0.2mm, with good dimensional stability, high and stable tensile strength of 700±30MPa. However, due to the lack of the protection of the fiber braided sleeve, the HDPE film sleeve is adhered to the optical fiber after molding, and the optical fiber survival rate is low, only 10%.

[0051] Comparative Example 6:

[0052] A smart fiber reinforced thermoplastic resin reinforcement material, such as Figure 1-Figure 2 As shown, it is composed of an inner core and an outer layer bonded together. Among them, the inner core is the monitoring optical fiber 10 and its sheath, the sheath is a continuous basalt fiber braided sleeve 20; the outer layer is a continuous fiber reinforced thermoplastic resin prepreg winding layer 40. The bonding of the inner core and the outer layer is achieved by the thermoplastic film sleeve 30 sleeved on the continuous basalt fiber braided sleeve 20 when the intelligent fiber reinforced thermoplastic resin reinforcement material is hot-melted. The thermoplastic film sleeve 30 melts, and the melt flows, part of which flows into the continuous basalt fiber braided sleeve 20, and part of which merges with the resin in the continuous fiber reinforced thermoplastic resin prepreg winding layer 40. The outer layer is a continuous basalt fiber reinforced hot HDPE prepreg with a thickness of 0.3mm. The inner diameter of the basalt fiber braided sleeve is 0.3mm, the inner diameter of the thermoplastic film sleeve is 0.5mm, the thickness of the continuous fiber braided sleeve is 0.1mm; the thickness of the thermoplastic film sleeve is 0.5mm. The optical fiber is inserted into the fiber braided sleeve along the axis, and then the film sleeve is covered on the outside of the fiber braided sleeve as the inner core, which is placed on the operating frame. Wide-width basalt fiber reinforced HDPE prepreg is used, and the prepreg is tightly wound with the inner core as the axis. The volume fraction of the fiber in the wide-width prepreg is 45%. After reaching 1.05 times the preset diameter, the smart ribs are removed and the final composite ribs are prepared by molding at 220°C and 120MPa. This embodiment plans to prepare ribs with a diameter of φ8mm, and the diameter of the ribs after molding is φ8.1±0.3mm. Due to the excessive thickness of the thermoplastic film, the internal thermoplastic film sleeve was not completely melted after high-temperature and high-pressure molding, resulting in defects inside the smart ribs, and the tensile strength is highly discrete. Five smart ribs were tested, with an average strength of 690Mpa and a coefficient of variation of 16%.

Claims

1. A smart fiber reinforced thermoplastic resin reinforcement material, characterized in that: It comprises a monitoring optical fiber and a continuous fiber braided sleeve and a continuous fiber reinforced thermoplastic resin prepreg winding layer which are arranged in sequence from the inside to the outside along the radial direction of the monitoring optical fiber: the monitoring optical fiber is used to realize intelligent detection; the fiber braided sleeve and the continuous fiber reinforced thermoplastic resin prepreg winding layer are bonded together by a thermoplastic film sleeve wrapped on the continuous fiber braided sleeve when the intelligent fiber reinforced thermoplastic resin reinforcement is hot-melted; when the intelligent fiber reinforced thermoplastic resin reinforcement is hot-melt-formed, the thermoplastic film sleeve melts, and the melt flows, a part of which flows into the fiber braided sheath, and a part of which is integrated with the resin in the continuous fiber reinforced thermoplastic resin prepreg winding layer; the continuous fiber braided sleeve is wrapped on the monitoring optical fiber, and is used to reduce the flow of the thermoplastic film sleeve melt into the continuous fiber braided sleeve when the intelligent fiber reinforced thermoplastic resin reinforcement is hot-melt-formed, and absorb the flowing melt.

2. The intelligent fiber reinforced thermoplastic resin reinforcement material according to claim 1, characterized in that: The inner diameter of the continuous fiber braided sleeve is 0.2-0.5mm; the inner diameter of the thermoplastic film sleeve is 0.1-0.2mm larger than the outer diameter of the fiber braided sleeve; the thickness of the continuous fiber braided sleeve is 0.1-0.3mm; the thickness of the thermoplastic film sleeve is 0.05-0.2mm; the thickness of the wide-width fiber reinforced thermoplastic resin prepreg winding layer is 0.3-0.5mm.

3. The intelligent fiber reinforced thermoplastic resin reinforcement material according to claim 2, characterized in that: The fibers in the continuous fiber braided sleeve are consistent with the fibers in the continuous fiber reinforced thermoplastic resin prepreg winding layer.

4. The intelligent fiber reinforced thermoplastic resin reinforcement material according to claim 3, characterized in that: The material of the thermoplastic film sleeve is consistent with the thermoplastic resin matrix in the continuous fiber reinforced thermoplastic resin prepreg winding layer.

5. The method for preparing the intelligent fiber reinforced thermoplastic resin reinforcement material according to any one of claims 1 to 4, characterized in that: include: Step 1: insert the monitoring optical fiber into the continuous fiber braided sleeve along the axis, and cover the continuous fiber braided sleeve with a thermoplastic film sleeve or coat the continuous fiber braided sleeve with a thermoplastic film to form an inner core; Step 2: With the inner core as the axis, a wide-width fiber-reinforced thermoplastic resin prepreg is tightly wound on the inner core to form a wide-width fiber-reinforced thermoplastic resin prepreg winding layer, and the winding is stopped until the diameter reaches 1.05-1.1 times of the preset composite fiber reinforcement diameter to form a wound reinforcement material; Step 3: Molding the coiled reinforcement to obtain the final composite reinforcement.

6. The method for preparing the intelligent fiber reinforced thermoplastic resin reinforcement material according to claim 5, characterized in that: In step 1, the thickness of the thermoplastic film sleeve is 0.05-0.2 mm.

7. The method for preparing the intelligent fiber reinforced thermoplastic resin reinforcement material according to claim 5, characterized in that: In step 2, the thickness of the wide-width fiber-reinforced thermoplastic resin prepreg winding layer formed by winding is 0.3-0.5 mm.

8. The method for preparing the intelligent fiber reinforced thermoplastic resin reinforcement material according to claim 5, characterized in that: Step 2 is performed under vacuum.

9. The method for preparing the intelligent fiber reinforced thermoplastic resin reinforcement material according to claim 8, characterized in that: Vacuum suction is performed on both sides of the wide fiber reinforced thermoplastic resin prepreg near the inner core to remove dust and impurities on the surface of the prepreg, ensure the pressure difference balance on both sides of the wide fiber reinforced thermoplastic resin prepreg, keep the wide fiber reinforced thermoplastic resin prepreg flat at all times, and improve the winding density.

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