High-strength composite material rib and preparation method thereof

Abstract

The invention discloses a high-strength composite material rib and a preparation method thereof. The high-strength composite material rib is composed of a rib body and ribs. The rib main body is obtained by carrying out one-time curing molding on fibers infiltrated with resin; the rib main body is provided with a rough surface; and the ribs are obtained by winding prepreg yarns on the rib main body and then carrying out secondary curing molding. The fiber volume content of the rib main body is increased through two-time curing forming of the rib main body and the ribs, the bonding strength between the ribs and the rib main body is improved through the rough surface of the rib main body, the bonding strength between the ribs and the rib main body is further improved by combining hyperbranched epoxy resin and a silane coupling agent in the ribs, and the bonding strength between the ribs and the rib main body is further improved. Finally, the tensile strength and the bonding strength with concrete can be respectively improved by about 25% and 15% compared with those of a composite material rib produced in the prior art. And the comprehensive use performance of the composite material rib is effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of composite material pultrusion, and in particular to a high-strength composite material rib and a preparation method thereof. Background Art

[0002] Fiber-reinforced resin-based composite materials have become one of the most promising new materials in the field of civil engineering due to their advantages of light weight, high strength, corrosion resistance, designability, and convenient construction. In recent years, carbon fiber composite bars, glass fiber composite bars, and basalt fiber composite bars have been increasingly used in concrete structures to replace easily corroded steel bars.

[0003] Composite reinforcement can be divided into two types according to the surface structure: plain reinforcement and rib reinforcement. Ribs are mostly used in concrete structures. Ribs are generally composed of two parts in terms of structure: the main body and the ribs. The fibers in the main body are generally distributed along the axial direction, and the fibers in the ribs are generally distributed along the circumferential direction. The fibers in the main body are collected into a bundle after being impregnated with resin, and the fibers in the ribs are generally dry yarns, which are impregnated by the resin overflowing after being wrapped around the main body, and finally the main body and the ribs are solidified as a whole.

[0004] Composite ribs are usually produced by wet pultrusion, which includes: the yarn bundle drawn out from the yarn frame enters the dipping tank for dipping, and then enters the preforming mold to extrude the excess resin and make the fibers arranged regularly; one or two strands of dry yarn are spirally wound on the surface of the yarn bundle to tighten the yarn bundle, and the overflowing resin soaks the wound dry yarn; the wound yarn bundle enters the oven for heating and curing under the traction of the traction machine, and finally is cut to a fixed length as required.

[0005] The problem with existing composite material ribs and preparation methods thereof is that the rib body is formed by spirally winding the ribs and then solidifying them as one piece. The fiber volume content in the body cannot be effectively increased due to process limitations and is generally around 60%. Therefore, the strength of the composite material ribs produced by existing technology is generally low and the advantage of the high tensile strength of the fibers cannot be fully utilized. On the other hand, the spiral winding of the ribs can easily lead to deformation of the fibers on the surface layer of the body, thereby further reducing the tensile strength of the composite material ribs. On another hand, the bonding strength between the body and the ribs in the existing composite material ribs is low, resulting in a low bonding strength between the composite material ribs and concrete. The above factors together lead to poor comprehensive performance of the existing composite material ribs. Summary of the invention

[0006] The purpose of the present invention is to provide a high-strength composite material rib and a preparation method thereof to solve the above-mentioned problems existing in the prior art.

[0007] To achieve the above object, the present invention provides the following solutions:

[0008] One of the technical solutions of the present invention: a high-strength composite material rib, consisting of a rib body and ribs; the ribs are spirally arranged on the surface of the rib body; the rib body is obtained by once curing and molding fibers impregnated with resin; the rib body has a rough surface; the ribs are obtained by winding prepreg yarns on the rib body and then curing and molding them twice.

[0009] Furthermore, the fiber volume content in the rib body is ≥68%.

[0010] Furthermore, the rib is a single rib or a double rib; the direction of the single rib is clockwise or counterclockwise; the direction of the double rib is clockwise and counterclockwise crosswise; the rib spacing of the ribs is 10-30mm, and the rib height is 0.5-1mm.

[0011] Furthermore, the fiber (the fiber in the rib body) is one or two of carbon fiber, glass fiber and basalt fiber; the resin is one of epoxy resin, vinyl resin, unsaturated polyester resin and polyurethane resin.

[0012] Furthermore, the prepreg yarn is obtained by impregnating a fiber with a resin mixture; the fiber is one of carbon fiber, glass fiber and basalt fiber; the resin mixture is a mixture of a hyperbranched epoxy resin, a curing agent and a silane coupling agent; the mass ratio of the hyperbranched epoxy resin, the curing agent and the silane coupling agent is 100:100:2-4.

[0013] The bonding strength between the rib and the rib body can be further improved by impregnating the fiber used for the rib with a hyperbranched epoxy resin added with a silane coupling agent.

[0014] Furthermore, during the preparation of the prepreg, the fiber is soaked in the resin mixture for ≥60 seconds.

[0015] Furthermore, the content of resin in the prepreg yarn is 50-60wt%.

[0016] Technical solution 2 of the present invention: A method for preparing the above-mentioned high-strength composite material rib is selected from one of the following two methods:

[0017] Method 1: preforming the resin-impregnated fiber in a preforming mold provided with a release cloth, and then entering a pultrusion mold for primary curing and molding to obtain a rib body with a release cloth attached to the surface; removing the release cloth on the surface of the rib body to form a rough surface; winding prepreg yarn on the surface of the rib body, and then performing secondary curing and molding to form ribs on the surface of the rib body to obtain the high-strength composite material rib;

[0018] Method 2: The resin-impregnated fiber is preformed in a preforming mold, and then enters a pultrusion mold for primary curing molding to obtain a rib body; the rib body is polished to form a rough surface; prepreg yarn is wrapped around the surface of the rib body, and then secondary curing molding is performed to form ribs on the surface of the rib body to obtain the high-strength composite material rib.

[0019] Furthermore, the one-time curing molding conditions in the method 1 and the method 2 include: a curing temperature of 100-200° C. and a pultrusion speed of 0.3-0.5 m / min.

[0020] Further, when the resin is epoxy resin, the one-time curing molding conditions in the first and second methods include: the temperature of the three curing zones is 120-180°C / 140-200°C / 160-190°C, and the pultrusion speed is 0.3-0.5m / min; when the resin is vinyl resin, the one-time curing molding conditions in the first and second methods include: the temperature of the three curing zones is 110-130°C / 140-170°C / 130-150°C, and the pultrusion speed is 0.3-0.5m / min ; When the resin is an unsaturated polyester resin, the one-time curing molding conditions in Method 1 and Method 2 include: the temperature of the three curing zones is 110-130°C / 140-170°C / 130-150°C, and the pultrusion speed is 0.3-0.5m / min; When the resin is a polyurethane resin, the one-time curing molding conditions in Method 1 and Method 2 include: the temperature of the three curing zones is 100-140°C / 160-200°C / 160-180°C, and the pultrusion speed is 0.3-0.5m / min.

[0021] Furthermore, the secondary curing molding conditions in the method 1 and the method 2 include: a curing temperature of 180-200° C. and a pultrusion speed of 0.3-0.5 m / min.

[0022] Furthermore, in the method 1 and the method 2, after the ribs are formed on the surface of the rib body through secondary curing molding, it also includes a step of cutting into a required length according to the product length requirements.

[0023] Furthermore, the demoulding cloth described in the first method is made of nylon fiber or polyester fiber, and can form a rough surface when directly peeled off.

[0024] Furthermore, the grinding described in the second method is specifically sandblasting grinding, and the surface roughness is polished to Ra6.3-Ra25.

[0025] Further, the device used in the first embodiment (such as Figure 3 The present invention comprises: a yarn rack 3, a dipping tank 4, a preforming mold 5, a pultrusion mold 6, a stripping cloth removal system 7, a winding system 8, a curing oven 9, a traction machine 10, a cutting machine 11, and a stripping cloth and a fixing device 12 thereof.

[0026] Furthermore, the device used in the second method (such as Figure 4 ) includes: a yarn rack 3, a dipping tank 4, a preforming mold 5, a pultrusion mold 6, a winding system 8, a curing oven 9, a traction machine 10, a cutting machine 11, and a grinding system 13.

[0027] The present invention discloses the following technical effects:

[0028] The high-strength composite material rib provided by the present invention is formed by two curing processes of the rib body and the rib, and in particular, the rib body is formed by heating and pressurizing the mold during the one-time curing process to squeeze out excess resin, thereby increasing the fiber volume content of the body and effectively improving the overall tensile strength of the composite material rib; the rib formed by surface winding and secondary curing will not affect the strength of the rib body and can ensure the anchoring force of the composite material rib with concrete during use; in addition, the rough surface of the rib body improves the bonding strength between the rib and the rib body, and combined with the use of hyperbranched epoxy resin and silane coupling agent in the rib, the bonding strength between the rib and the rib body is further improved; the above factors work synergistically, and ultimately the tensile strength of the composite material rib can be increased by about 25% compared with the composite material rib produced by the prior art, and the bonding strength between the composite material rib and concrete can be increased by about 15% compared with the composite material rib produced by the prior art, thereby effectively improving the comprehensive performance of the composite material rib.

[0029] The method for preparing high-strength composite material ribs provided by the present invention has high product production efficiency, high degree of automation and stable product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 Schematic diagram of the structure of the high-strength composite material rib (the rib is a single rib) of the present invention, wherein 1 is the rib body and 2 is the rib;

[0032] Figure 2 Schematic diagram of the structure of the high-strength composite material rib (rib is double rib) of the present invention, wherein 1 is the rib body and 2 is the rib;

[0033] Figure 3The present invention is a schematic diagram of the device and process used in the preparation method of the high-strength composite material rib of the present invention, wherein 3 is a yarn frame, 4 is a dipping tank, 5 is a preforming mold, 6 is a pultrusion mold, 7 is a mold cloth removal system, 8 is a winding system, 9 is a curing oven, 10 is a traction machine, 11 is a cutting machine, and 12 is a demoulding cloth and its fixing device;

[0034] Figure 4 The present invention is a schematic diagram of the device and process used in the second preparation method of the high-strength composite material rib, wherein 3 is a yarn frame, 4 is a dipping tank, 5 is a preforming mold, 6 is a pultrusion mold, 8 is a winding system, 9 is a curing oven, 10 is a traction machine, 11 is a cutting machine, and 13 is a grinding system.

[0035] Figure 5 The figure is a schematic diagram of the device and process used for the integral curing and forming of ordinary composite material ribs, wherein 3 is a yarn rack, 4 is a dipping tank, 5 is a preforming mold, 8 is a winding system, 9 is a curing oven, 10 is a traction machine, and 11 is a cutting machine. DETAILED DESCRIPTION

[0036] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as limiting the present invention, but should be understood as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0037] It should be understood that the terms described in the present invention are only for describing a particular embodiment and are not intended to limit the present invention. In addition, for the numerical range in the present invention, it should be understood that each intermediate value between the upper and lower limits of the scope is also specifically disclosed. The intermediate value in any stated value or stated range, and each smaller range between any other stated value or intermediate value in the described range is also included in the present invention. The upper and lower limits of these smaller ranges can be independently included or excluded in the scope.

[0038] Unless otherwise indicated, all technical and scientific terms used herein have the same meanings as those generally understood by those skilled in the art. Although the present invention describes only preferred methods and materials, any methods and materials similar or equivalent to those described herein may also be used in the implementation or testing of the present invention. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials associated with the documents. In the event of a conflict with any incorporated document, the content of this specification shall prevail.

[0039] It will be apparent to those skilled in the art that various modifications and variations may be made to the specific embodiments of the present invention description without departing from the scope or spirit of the present invention. Other embodiments derived from the present invention description will be apparent to the skilled artisan. The present invention description and examples are exemplary only.

[0040] The words “include,” “including,” “have,” “contain,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0041] The present invention provides a high-strength composite material rib, which consists of a rib body and ribs; the ribs are spirally arranged on the surface of the rib body; the rib body is obtained by once curing and molding fibers impregnated with resin; the rib body has a rough surface; the ribs are obtained by winding prepreg yarns on the rib body and then curing and molding them twice.

[0042] Preferably, the fiber volume content in the rib body is ≥ 68%.

[0043] Preferably, the rib is a single rib or a double rib; the direction of the single rib is clockwise or counterclockwise; the direction of the double rib is clockwise and counterclockwise crosswise; the rib spacing of the ribs is 10-30mm, and the rib height is 0.5-1mm.

[0044] Preferably, when the rib is a single rib, the structural schematic diagram of the high-strength composite material rib is as follows: Figure 1 shown.

[0045] Preferably, when the rib is a double rib, the structural schematic diagram of the high-strength composite material rib is as follows: Figure 2 shown.

[0046] Preferably, the fiber (the fiber in the rib body) is one or two of carbon fiber, glass fiber and basalt fiber; and the resin is one of epoxy resin, vinyl resin, unsaturated polyester resin and polyurethane resin.

[0047] Preferably, the prepreg yarn is obtained by impregnating a fiber with a resin mixture; the fiber is one of carbon fiber, glass fiber and basalt fiber; the resin mixture is a mixture of a hyperbranched epoxy resin, a curing agent and a silane coupling agent; the mass ratio of the hyperbranched epoxy resin, the curing agent and the silane coupling agent is 100:100:2-4.

[0048] Preferably, during the preparation of the prepreg, the fiber is soaked in the resin mixture for ≥60 seconds.

[0049] Preferably, the resin content in the prepreg yarn is 50-60wt%.

[0050] The present invention also provides a method for preparing the above-mentioned high-strength composite material rib, which is selected from one of the following two methods:

[0051] Method 1: preforming the resin-impregnated fiber in a preforming mold provided with a release cloth, and then entering a pultrusion mold for primary curing and molding to obtain a rib body with a release cloth attached to the surface; removing the release cloth on the surface of the rib body to form a rough surface; winding prepreg yarn on the surface of the rib body, and then performing secondary curing and molding to form ribs on the surface of the rib body to obtain the high-strength composite material rib;

[0052] Method 2: The resin-impregnated fiber is preformed in a preforming mold, and then enters a pultrusion mold for primary curing molding to obtain a rib body; the rib body is polished to form a rough surface; prepreg yarn is wrapped around the surface of the rib body, and then secondary curing molding is performed to form ribs on the surface of the rib body to obtain the high-strength composite material rib.

[0053] Preferably, the one-time curing molding conditions in the method 1 and the method 2 include: a curing temperature of 100-200° C. and a pultrusion speed of 0.3-0.5 m / min.

[0054] Preferably, when the resin is epoxy resin, the one-time curing molding conditions in the first and second methods include: the temperature of the three curing zones is 120-180°C / 140-200°C / 160-190°C, and the pultrusion speed is 0.3-0.5m / min; when the resin is vinyl resin, the one-time curing molding conditions in the first and second methods include: the temperature of the three curing zones is 110-130°C / 140-170°C / 130-150°C, and the pultrusion speed is 0.3-0.5m / min ; When the resin is an unsaturated polyester resin, the one-time curing molding conditions in Method 1 and Method 2 include: the temperature of the three curing zones is 110-130°C / 140-170°C / 130-150°C, and the pultrusion speed is 0.3-0.5m / min; When the resin is a polyurethane resin, the one-time curing molding conditions in Method 1 and Method 2 include: the temperature of the three curing zones is 100-140°C / 160-200°C / 160-180°C, and the pultrusion speed is 0.3-0.5m / min.

[0055] Preferably, the secondary curing molding conditions in the method 1 and the method 2 are: curing temperature 180-200° C., pultrusion speed 0.3-0.5 m / min.

[0056] Preferably, in the method 1 and the method 2, after the ribs are formed on the surface of the rib body through secondary curing molding, the method further includes a step of cutting into a required length according to the product length requirements.

[0057] Preferably, the demoulding cloth in the first embodiment is made of nylon fiber or polyester fiber, which can form a rough surface by directly peeling it off.

[0058] Preferably, the grinding in the second method is sandblasting grinding, and the surface roughness is Ra6.3-Ra25.

[0059] Preferably, the device used in method 1 (such as Figure 3 The present invention comprises: a yarn rack 3, a dipping tank 4, a preforming mold 5, a pultrusion mold 6, a stripping cloth removal system 7, a winding system 8, a curing oven 9, a traction machine 10, a cutting machine 11, and a stripping cloth and a fixing device 12 thereof.

[0060] Preferably, in combination with the device, the specific operation steps of method 1 are:

[0061] After the fiber is drawn out from the yarn rack 3, it is impregnated with resin in the dipping tank 4; then it is preformed in the preforming mold 5 in the preforming process, and a layer of release cloth 12 is added to the upper and lower parts of the preforming mold 5, and then it enters the pultrusion mold 6 for one-time curing and forming to obtain a rib body 1 with a release cloth attached to the surface; the release cloth on the surface of the rib body 1 is removed by the release cloth removal system 7 to form a rough surface; the prepreg is wound on the surface of the rib body 1 by the winding system 8, and the curing oven 9 is used for secondary curing to form the surface ribs 2, and finally it is cut into the required length by the cutting machine 11.

[0062] Method 1 and the device used therein have the following characteristics:

[0063] 1) The rib body and the ribs are cured and formed twice. The rib body first enters the pultrusion die 6 for curing and forming, and then the prepreg yarn is wrapped around the surface of the cured rib body and enters the curing oven 9 for secondary curing to form the ribs;

[0064] 2) A stripping cloth fixing device is set in the preforming process to ensure that the stripping cloth installation position and tension are adjustable;

[0065] 3) A stripping cloth removal system 7 is provided behind the pultrusion die 6 to realize automatic stripping of the stripping cloth;

[0066] 4) A winding system 8 and a curing oven 9 are provided to realize online winding of the prepreg yarn and online curing of the rib 2 .

[0067] Preferably, the device used in the second method (such as Figure 4 ) includes: a yarn rack 3, a dipping tank 4, a preforming mold 5, a pultrusion mold 6, a winding system 8, a curing oven 9, a traction machine 10, a cutting machine 11, and a grinding system 13.

[0068] Preferably, in combination with the device, the specific operation steps of the second method are:

[0069] After the fiber is drawn out from the yarn rack 3, it is impregnated with resin in the impregnation tank 4; then it is preformed in the preforming mold 5 in the preforming process, and then enters the pultrusion mold 6 for one-time curing to obtain the rib body 1; the rib body 1 is polished by the polishing system 13 to form a rough surface; the prepreg is wound on the surface of the rib body 1 by the winding system 8, and the surface ribs 2 are formed by secondary curing in the curing oven 9, and finally cut into the required length by the cutting machine 11.

[0070] Method 2 and the device used therein have the following characteristics:

[0071] 1) The rib body and the ribs are cured and formed twice. The rib body first enters the pultrusion die 6 for curing and forming, and then the prepreg yarn is wrapped around the surface of the cured rib body and enters the curing oven 9 for secondary curing to form the ribs;

[0072] 2) A grinding system 13 is provided behind the pultrusion die 6 to achieve online grinding of the rib body;

[0073] 3) A winding system 8 and a curing oven 9 are provided to realize online winding of the prepreg yarn and online curing of the rib.

[0074] The high-strength composite material rib and the preparation method thereof of the present invention are further described below in conjunction with specific embodiments.

[0075] In the following examples and comparative examples, the tensile strength of the composite material ribs and the bonding strength with concrete were tested according to the test standard: "Test Method for Basic Mechanical Properties of Structural Reinforced Composite Material Reinforcements" (GB / T30022-2013), and the number of specimens in each group was 5.

[0076] Example 1

[0077] A high-strength composite material rib (structural schematic diagram as shown in Figure 1 As shown in FIG. 1 , the rib body 1 is composed of a rib body 1 and a rib 2. The outer diameter of the rib body 1 is φ8 mm, the rib 2 is a single rib, the spiral direction is clockwise, the rib spacing is 15 mm, and the rib height is 0.6 mm. The fiber of the rib body 1 is T700S grade 24K carbon fiber, and the pultrusion resin is epoxy resin GE550 (A and B components are mixed in a mass ratio of 100:105); the fiber of the rib 2 is 2400tex E glass fiber, which is pre-impregnated with a hyperbranched epoxy resin mixture. The mass ratio of hyperbranched epoxy resin GE3226A, curing agent GE3226B and KH-560 silane coupling agent in the hyperbranched epoxy resin mixture is 100:100:2. The pre-impregnation time of the glass fiber in the hyperbranched resin mixture is 60s to ensure that the fiber is fully impregnated. The pre-impregnated glass fiber passes through a φ2mm circular hole plate to squeeze out excess resin to obtain a glass fiber pre-impregnated yarn with a resin content of 50-55%, which is wound on a paper tube for standby use.

[0078] The preparation method is as follows (the preparation device and process diagram are as follows Figure 3 shown):

[0079] After the carbon fiber is drawn out from the creel 3, it is impregnated with epoxy resin GE550 in the dipping tank 4 for 60 seconds; then, in the preforming process, it is preformed through a preforming mold 5 (size is φ8.5mm), and a layer of demoulding cloth 12 (the demoulding cloth is made of nylon fiber) is added to the upper and lower parts of the preforming mold 5, and then it enters the pultrusion mold 6 for one-time curing and forming, and the curing temperature of the three zones is 170℃ / 190℃ / 180℃, and the pultrusion speed is 0.4m / min, so as to obtain a rib body 1 with a demoulding cloth attached to the surface; the demoulding cloth on the surface of the cured rib body 1 is removed by the demoulding cloth removal system 7 to form a rough hemp surface effect; the glass fiber prepreg is wound on the surface of the rib body 1 by the winding system 8, and the surface ribs 2 are formed by secondary curing in the curing oven 9, and the curing temperature is 190℃, and the pultrusion speed is 0.4m / min; finally, it is cut into 6m lengths by a cutting machine 11.

[0080] Comparative Example 1

[0081] A composite material rib with an outer diameter of φ8mm of the rib body is prepared by an integrated curing method. The composite material rib consists of a rib body 1 and a rib 2. The outer diameter of the rib body 1 is φ8mm, and the rib 2 is a single rib with a clockwise spiral direction, a rib spacing of 15mm, and a rib height of 0.6mm. The fiber of the rib body 1 is T700S grade 24K carbon fiber, and the pultrusion resin is epoxy resin GE550 (components A and B are matched in a mass ratio of 100:105); the fiber of rib 2 is 2400tex E glass fiber. The specific preparation method is as follows (the schematic diagram of the preparation device and process is shown in the figure). Figure 5 shown):

[0082] After the carbon fiber is led out from the yarn rack 3, it is impregnated with epoxy resin GE550 in the dipping tank 4 for 60 seconds; then it is preformed in the preforming process through a preforming mold 5 (size is φ8.5mm); a winding system 8 is used to unidirectionally wind 2400tex E glass fiber dry yarn on the surface of the preformed rib body 1, and the rib body 1 is tightly wound, and at the same time, the overflowing resin impregnates the wound dry yarn to form the surface rib 2; under the traction of the traction machine, it enters the oven for heating and curing, and the main body 1 and the rib 2 are cured and formed as a whole, the curing temperature is 180°C, and the pultrusion speed is 0.4m / min; finally, it is cut into 6m lengths each by a cutting machine 11.

[0083] After testing, the composite rib prepared in Example 1 has a fiber volume content of 70% in the rib body, an average tensile strength of 2900MPa, and an average bonding strength with concrete of 15Mpa; while the composite rib with an outer diameter of φ8mm prepared by the integrated curing method in Comparative Example 1 has a fiber volume content of 60% in the rib body, an average tensile strength of 2300MPa, and an average bonding strength with concrete of 13Mpa. The composite rib prepared by the method of the present invention has a tensile strength increased by about 26% and a bonding strength increased by about 15% compared with the composite rib prepared by the original preparation method (integrated curing method).

[0084] Example 2

[0085] A high-strength composite material rib (structural schematic diagram as shown in Figure 2 As shown in FIG. 1 , the rib body 1 is composed of a rib body 1 and a rib 2. The outer diameter of the rib body 1 is φ14 mm, the rib 2 is a double rib, the spiral direction is clockwise and counterclockwise, the rib spacing is 20 mm, and the rib height is 0.6 mm. The fiber of the rib body 1 is 2400tex high modulus glass fiber, and the pultrusion resin is epoxy resin GE550 (A and B components are mixed in a mass ratio of 100:105); the fiber of the rib 2 is 2400tex E glass fiber, which is pre-impregnated with a hyperbranched epoxy resin mixture. The mass ratio of hyperbranched epoxy resin GE3226A, curing agent GE3226B and KH-560 silane coupling agent in the hyperbranched epoxy resin mixture is 100:100:3. The pre-impregnation time of the glass fiber in the hyperbranched resin mixture is 60s to ensure that the fiber is fully impregnated. The pre-impregnated fiber passes through a φ2mm circular hole plate to squeeze out excess resin to obtain a glass fiber pre-impregnated yarn with a resin content of 50-55%, which is wound on a paper tube for standby use.

[0086] The preparation method is as follows (the preparation device and process diagram are as follows Figure 4 shown):

[0087] After the glass fiber is drawn out from the yarn rack 3, it is impregnated with epoxy resin GE550 in the dipping tank 4 for 60 seconds; in the preforming process, it is preformed through the preforming mold 5 (size is φ14.5mm), and then enters the pultrusion mold 6 for one-time curing and molding. The temperature of the three curing zones is 160℃180℃ / 170℃, and the pultrusion speed is 0.3m / min to obtain the rib body 1; the cured rib body 1 is polished to a surface roughness Ra12.5 by the polishing system 13 to form a rough surface effect; the glass fiber prepreg yarn is bidirectionally wound clockwise and counterclockwise on the surface of the rib body 1 by the winding system 8, and the surface ribs 2 are formed by secondary curing in the curing oven 9, the curing temperature is 180℃, and the pultrusion speed is 0.3m / min; finally, it is cut into 4m lengths by the cutting machine 11.

[0088] Comparative Example 2

[0089] A composite material rib with an outer diameter of φ14mm of the rib body is prepared by an integrated solidification method. The composite material rib consists of a rib body 1 and a rib 2. The outer diameter of the rib body 1 is φ14mm, and the rib 2 is a double rib with a spiral direction that crosses clockwise and counterclockwise. The rib spacing is 20mm, and the rib height is 0.6mm. The fiber of the rib body 1 is 2400tex high modulus glass fiber, and the pultrusion resin is epoxy resin GE550 (A and B components are matched in a mass ratio of 100:105); the fiber of rib 2 is 2400tex E glass fiber. The specific preparation method is as follows: (The schematic diagram of the preparation device and process is shown in the figure) Figure 5 shown):

[0090] After the glass fiber is drawn out from the yarn rack 3, it is impregnated with epoxy resin GE550 in the dipping tank 4 for 60 seconds; then it is preformed in the preforming process through a preforming mold 5 (size is φ14mm); a winding system 8 is used to bidirectionally wind 2400tex E glass fiber dry yarn on the surface of the preformed rib body 1 in a clockwise and counterclockwise manner to tighten the rib body 1, and at the same time, the overflowing resin impregnates the wound dry yarn to form the surface rib 2; under the traction of the traction machine, it enters the oven for heating and curing, and the body 1 and the rib 2 are cured and formed as a whole, the curing temperature is 180°C, and the pultrusion speed is 0.3m / min; finally, it is cut into 4m lengths each by a cutting machine 11.

[0091] After testing, the composite rib prepared in Example 2 has a fiber volume content of 69% in the rib body, an average tensile strength of 1500MPa, and an average bonding strength with concrete of 16Mpa; while the composite rib with an outer diameter of φ14mm prepared by the integrated curing method in Comparative Example 2 has a fiber volume content of 58% in the rib body, an average tensile strength of 1200MPa, and an average bonding strength with concrete of 14Mpa. The composite rib prepared by the method of the present invention has a tensile strength increased by about 25% and a bonding strength increased by about 14% compared with the composite rib prepared by the original preparation method (integrated curing method).

[0092] Comparative Example 3

[0093] The same as Example 1, except that the fiber of rib 2 is 2400tex E glass fiber, which is pre-impregnated with epoxy resin GE550 (components A and B are in a mass ratio of 100:105), and KH-560 silane coupling agent is not added to the epoxy resin to obtain glass fiber pre-impregnated yarn.

[0094] After testing, the average tensile strength of the composite rib prepared in Example 1 is 2900MPa, and the average bonding strength with concrete is 15Mpa; while the average tensile strength of the composite rib prepared in Comparative Example 3 is 2850MPa, and the average bonding strength with concrete is 12Mpa. It can be seen that although the use of hyperbranched epoxy resin + silane coupling agent in the present invention has little effect on the tensile strength of the rib, it can effectively improve the bonding strength between the rib and concrete. By using hyperbranched epoxy resin + silane coupling agent, the composite rib prepared by the method of the present invention has a bonding strength improved by about 25% compared with the composite rib prepared in Comparative Example 3.

[0095] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A high-strength composite material rib, characterized in that: It consists of a rib body and ribs; the rib spiral is arranged on the surface of the rib body; the rib body is obtained by once curing and molding the fiber impregnated with resin; the rib body has a rough surface; the rib is obtained by winding the prepreg yarn on the rib body and then curing and molding it twice.

2. The high-strength composite material rib according to claim 1, characterized in that: The fiber volume content in the rib body is ≥68%.

3. The high-strength composite material rib according to claim 1, characterized in that: The rib is a single rib or a double rib; the direction of the single rib is clockwise or counterclockwise; the direction of the double rib is clockwise and counterclockwise crosswise; the rib spacing of the rib is 10-30mm, and the rib height is 0.5-1mm.

4. The high-strength composite material rib according to claim 1, characterized in that: The fiber is one or two of carbon fiber, glass fiber and basalt fiber; the resin is one of epoxy resin, vinyl resin, unsaturated polyester resin and polyurethane resin.

5. The high-strength composite material rib according to claim 1, characterized in that: The prepreg yarn is obtained by impregnating a fiber with a resin mixture; the fiber is one of carbon fiber, glass fiber and basalt fiber; the resin mixture is a mixture of a hyperbranched epoxy resin, a curing agent and a silane coupling agent; the mass ratio of the hyperbranched epoxy resin, the curing agent and the silane coupling agent is 100:100:2-4.

6. A method for preparing a high-strength composite material rib according to any one of claims 1 to 5, characterized in that: Choose from one of the following two options: Method 1: preforming the resin-impregnated fiber in a preforming mold provided with a release cloth, and then entering a pultrusion mold for primary curing and molding to obtain a rib body with a release cloth attached to the surface; removing the release cloth on the surface of the rib body to form a rough surface; winding prepreg yarn on the surface of the rib body, and then performing secondary curing and molding to form ribs on the surface of the rib body to obtain the high-strength composite material rib; Method 2: The resin-impregnated fiber is preformed in a preforming mold, and then enters a pultrusion mold for primary curing molding to obtain a rib body; the rib body is polished to form a rough surface; prepreg yarn is wrapped around the surface of the rib body, and then secondary curing molding is performed to form ribs on the surface of the rib body to obtain the high-strength composite material rib.

7. The preparation method according to claim 6, characterized in that: The one-step curing molding conditions in the first and second methods include: a curing temperature of 100-200° C. and a pultrusion speed of 0.3-0.5 m / min.

8. The preparation method according to claim 6, characterized in that: The secondary curing molding conditions in the method 1 and the method 2 include: a curing temperature of 180-200° C. and a pultrusion speed of 0.3-0.5 m / min.

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