CN107987302B - Surface enhanced resin matrix composite reinforcing rib and preparation method thereof - Google Patents
Surface enhanced resin matrix composite reinforcing rib and preparation method thereof Download PDFInfo
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- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/06—Coating with compositions not containing macromolecular substances
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/50—Shaping or impregnating by compression not applied for producing articles of indefinite length, e.g. prepregs, sheet moulding compounds [SMC] or cross moulding compounds [XMC]
- B29C70/52—Pultrusion, i.e. forming and compressing by continuously pulling through a die
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
- B29C70/681—Component parts, details or accessories; Auxiliary operations
- B29C70/683—Pretreatment of the preformed part, e.g. insert
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- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/04—Reinforcing macromolecular compounds with loose or coherent fibrous material
- C08J5/0405—Reinforcing macromolecular compounds with loose or coherent fibrous material with inorganic fibres
- C08J5/042—Reinforcing macromolecular compounds with loose or coherent fibrous material with inorganic fibres with carbon fibres
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- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/04—Reinforcing macromolecular compounds with loose or coherent fibrous material
- C08J5/046—Reinforcing macromolecular compounds with loose or coherent fibrous material with synthetic macromolecular fibrous material
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- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
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- C08J2363/00—Characterised by the use of epoxy resins; Derivatives of epoxy resins
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2377/00—Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
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- C08J2461/00—Characterised by the use of condensation polymers of aldehydes or ketones; Derivatives of such polymers
- C08J2461/04—Condensation polymers of aldehydes or ketones with phenols only
- C08J2461/06—Condensation polymers of aldehydes or ketones with phenols only of aldehydes with phenols
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- C08J2477/00—Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
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Abstract
The invention discloses a surface-enhanced resin matrix composite reinforcing rib and a preparation method thereof, and belongs to the field of composite building reinforcement. The surface-enhanced resin-based composite material reinforcing rib comprises an internal reinforced fiber resin-based composite material, an outer winding layer and an outermost reinforcing particle, wherein the reinforced fiber is formed for the first time through a pultrusion process after being impregnated into a resin matrix, then the outer layer of the pultruded composite material is wound for the second time to impregnate the resin matrix, and finally the surface reinforcing particle is covered in a semi-cured state for re-curing forming. The invention not only has the advantages of the existing composite material reinforcing ribs, but also has the outstanding characteristics of stronger binding force with the base material, better reinforcing effect and the like.
Description
Technical Field
The invention relates to the field of composite material building reinforcement, in particular to a surface-enhanced resin matrix composite material reinforcing rib and a preparation method thereof.
Background
The reinforcing steel bar has been used as reinforcing steel bar in building field for many years, and has the advantages of easily available raw materials, low price, etc., but the reinforcing steel bar has limited strength, is easy to corrode in wet environment, has heavy weight and is inconvenient to carry, so the composite reinforcing steel bar has been produced in recent years. Compared with the traditional reinforcing steel bars, the composite reinforcing steel bar has the advantages of high strength, corrosion resistance, light weight and the like, and has been popularized and used at present.
The existing composite material reinforcing rib is prepared from reinforcing fibers and a resin matrix through a pultrusion winding process, and has a smooth surface. The composite reinforcing rib is tightly connected with a base material such as concrete and the like through a surface thread structure. However, the composite material reinforcing rib has smooth surface, weak binding force with concrete and limited reinforcing effect.
Disclosure of Invention
The invention provides a surface enhanced resin matrix composite reinforcing rib and a preparation method thereof, which not only have the advantages of the existing composite reinforcing rib, but also have the outstanding characteristics of stronger binding force with a base material, better reinforcing effect and the like.
In order to solve the technical problems, the invention provides the following technical scheme:
in one aspect, the invention provides a surface-enhanced resin matrix composite reinforcing rib, which comprises an internal reinforced fiber resin matrix composite, an outer winding layer and an outermost reinforcing particle, wherein the reinforced fiber is formed for the first time by a pultrusion process after being impregnated with a resin matrix, then the outer layer of the pultruded composite is wound with a second layer of the pultruded resin matrix, and finally the surface-enhanced particle is covered in a semi-cured state for re-curing and forming.
Further, the fiber is one or more of carbon fiber, glass fiber, basalt fiber, aramid fiber, polyethylene fiber and silicon carbide fiber.
Further, the resin matrix comprises a thermosetting resin system and/or a thermoplastic resin system, wherein:
the thermosetting resin system is one or more of an epoxy resin system, a phenolic resin system and a vinyl resin system;
the thermoplastic resin system is one or more of polypropylene, nylon, thermoplastic polyester resin, polyphenylene sulfide resin and polyether-ether-ketone resin.
Further, the reinforcing particles comprise one or more of sand, silicon dioxide, glass beads, barium sulfate and kaolin.
On the other hand, the invention also provides a preparation method of the surface enhanced resin matrix composite reinforcing rib, which comprises the following steps:
step 1: the internal reinforcing fibers are arranged on the creel, then the resin matrix is impregnated through the impregnation tank, and the resin matrix is pre-cured through the pre-curing box;
step 2: winding fibers impregnated with the resin matrix by the glue adding device are wound on the inner composite material under the driving of a winding unit;
step 3: and (3) entering a reinforced particle groove, attaching reinforced particles on the outermost layer, and then entering a curing box together for curing and molding.
Further, in the step 1, the degree of pre-curing is 60% or less.
Further, if the resin matrix in the step 1 is in a solid state, the gum dipping tank is a closed type heating and pressurizing gum dipping tank, and if the resin matrix in the step 1 is a thermosetting resin system, the pre-curing tank needs to be heated.
Further, in the step 2, the wound material is put into a heat treatment box for heat treatment.
In step 3, the method for attaching the reinforcing particles to the outermost layer is that the semi-cured composite material enters a groove filled with the reinforcing particles, and a vibration device is arranged at the bottom of the groove filled with the reinforcing particles so that the reinforcing particles are uniformly attached to the outer layer of the composite material.
The invention has the following beneficial effects:
according to the surface-enhanced resin-based composite material reinforcing rib and the preparation method thereof, the surface-enhanced resin-based composite material reinforcing rib is reinforced by adopting surface particles, so that the friction force is greatly increased, and the surface-enhanced resin-based composite material reinforcing rib can be combined with concrete more tightly. The composite material reinforcing rib prepared by the invention has the advantages that the surface is provided with reinforcing particles, the compatibility with the base material, especially the most commonly used concrete is better, the surface roughness is greatly enhanced, and the interfacial binding force with the base material is also greatly improved when the composite material reinforcing rib is used as the reinforcing rib. Therefore, the composite material reinforcing rib has the advantages of the existing composite material reinforcing rib, and has the outstanding characteristics of stronger binding force with a base material, better reinforcing effect and the like.
Drawings
FIG. 1 is a schematic structural view of a surface-enhanced resin matrix composite reinforcing rib of the present invention;
fig. 2 is a schematic diagram of a method for preparing a surface-enhanced resin matrix composite reinforcing rib according to the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages to be solved more apparent, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.
In one aspect, as shown in fig. 1 and 2, the present invention provides a surface-enhanced resin matrix composite reinforcing rib, which comprises an inner reinforcing fiber resin matrix composite 1, an outer winding layer 2 and an outermost reinforcing particle 3, wherein the reinforcing fiber is formed by a first step of extrusion process after being impregnated with a resin matrix, a second step of winding the outer layer of the extruded composite material with a second layer of impregnated resin matrix, and finally, the surface-enhanced particle is covered in a semi-cured state, and the re-cured forming is performed.
According to the surface-enhanced resin-based composite material reinforcing rib, surface particles are adopted for reinforcing the surface-enhanced resin-based composite material reinforcing rib, so that the friction force is greatly increased, and the surface-enhanced resin-based composite material reinforcing rib can be combined with concrete more tightly. The composite material reinforcing rib prepared by the invention has the advantages that the surface is provided with reinforcing particles, the compatibility with the base material, especially the most commonly used concrete is better, the surface roughness is greatly enhanced, and the interfacial binding force with the base material is also greatly improved when the composite material reinforcing rib is used as the reinforcing rib. Therefore, the composite material reinforcing rib has the advantages of the existing composite material reinforcing rib, and has the outstanding characteristics of stronger binding force with a base material, better reinforcing effect and the like.
The invention is that the reinforced fiber and the resin matrix are formed for the first time through a pultrusion and winding process, the surface reinforced particles are covered in a semi-solidified state, and then the secondary solidification forming is carried out. Firstly, the arranged reinforced fibers are preheated and preformed by a curing die of a pultrusion production line, and the fiber reinforced composite material coming out of the opening of the curing die is not completely cured, but is a semi-cured composite material with the curing degree of less than 60%; winding the impregnated reinforcing fiber on the semi-cured composite core rod, wherein the reinforcing fiber and the resin matrix used in the winding step can be the same as or different from those used in the pultrusion step; the composite material after being drawn and wound continuously advances under the traction of the traction machine, and at the moment, the heating treatment can be carried out, and the heating treatment has the advantages that the reinforcing fiber wound on the outer layer can be primarily solidified, the strength is certain, and if the fiber wound on the outer layer is tighter, the shape can be kept under the action of the tension force, and the heating treatment can also be omitted. The composite material subjected to pultrusion winding passes through a reinforced particle groove, reinforced particles are filled in the reinforced particle groove, and a vibration device is arranged at the bottom of the reinforced particle groove, so that the surface of the composite material can be uniformly stained with the reinforced particles. The composite material passing through the reinforced particle groove is coated with reinforced particles on the outer layer, and then the reinforced particles are put into a curing box together for curing and forming.
Preferably, the fiber can be one or more of organic fiber or/and inorganic fiber such as carbon fiber, glass fiber, basalt fiber, aramid fiber, polyethylene fiber, silicon carbide fiber and the like, and can comprise but is not limited to the above fibers.
Further, the resin matrix may include one or more of a thermosetting resin system such as an epoxy resin system, a phenolic resin system, a vinyl resin system, and/or a thermoplastic resin system such as polypropylene, nylon, thermoplastic polyester resin, polyphenylene sulfide resin, and polyether ether ketone resin, and may include, but not limited to, the above resins.
As an improvement of the present invention, the reinforcing particles may include one or more of sand, silica, glass beads, barium sulfate, kaolin, and the like, and may include, but are not limited to, the above reinforcing particles.
On the other hand, the invention also provides a preparation method of the surface enhanced resin matrix composite reinforcing rib, which comprises the following steps:
step 1: the internal reinforcing fibers 10 are arranged on the creel 1, then the resin matrix is impregnated by the impregnation tank 2, and the pre-curing is carried out by the pre-curing box 3;
step 2: winding fibers 11 impregnated with the resin matrix by the glue adding device 9 are wound on the inner composite material under the drive of the winding unit 4;
step 3: into the reinforcing particle groove 6, the reinforcing particles 12 are adhered to the outermost layer, and then the reinforcing particles are put into the curing box 8 together for curing and molding.
According to the preparation method of the surface-enhanced resin-based composite material reinforcing rib, the surface-enhanced resin-based composite material reinforcing rib is reinforced by adopting surface particles, so that the friction force is greatly increased, and the surface-enhanced resin-based composite material reinforcing rib can be combined with concrete more tightly. The composite material reinforcing rib prepared by the invention has the advantages that the surface is provided with reinforcing particles, the compatibility with the base material, especially the most commonly used concrete is better, the surface roughness is greatly enhanced, and the interfacial binding force with the base material is also greatly improved when the composite material reinforcing rib is used as the reinforcing rib. Therefore, the composite material reinforcing rib has the advantages of the existing composite material reinforcing rib, and has the outstanding characteristics of stronger binding force with a base material, better reinforcing effect and the like.
Further, in step 1, the degree of pre-curing is 60% or less.
In the present invention, if the resin matrix in step 1 is in a solid state, the dipping tank 2 is a closed type heating and pressurizing glue injection type dipping tank, and if the resin matrix in step 1 is a thermosetting resin system, the pre-curing tank 3 needs to be heated.
Preferably, in step 2, the winding may be followed by heat treatment in a heat treatment tank 5.
As an improvement of the present invention, in step 3, the reinforcing particles are adhered to the outermost layer in such a manner that the semi-cured composite material is introduced into a tank containing the reinforcing particles, and the bottom of the tank containing the reinforcing particles is preferably provided with a vibration device 7 so that the reinforcing particles are uniformly adhered to the outer layer of the composite material.
The features and details of the present invention are further illustrated below in conjunction with specific examples, but the listed processes and data are not meant to limit the scope of the invention.
Example 1
Taking the preparation of the thermosetting resin matrix composite reinforcing ribs formed by the inner carbon fiber layer, the outer glass fiber layer and the outermost sand soil layer as an example.
The method comprises the steps of arranging the internal reinforcing fiber 50 bundles of 12K carbon fibers on a creel 1, immersing an epoxy-anhydride resin system through a dipping tank 2, pre-curing through a pre-curing box 3, wherein the diameter of the curing box is 6.5mm, the length of the curing box is 90cm, each 30cm is provided with a heating section, the heating temperature is 60 ℃, the temperature is 80 ℃ and the temperature of the heating section is 100 ℃, the curing degree of the composite material reaches 55% when the composite material comes out of the curing box 3, then immersing the winding fiber 3 bundles of 12K glass fibers of phenolic resin matrix resin by a glue adding device 9, winding the winding fiber 3 bundles of 12K glass fibers on the internal composite material under the driving of a winding unit 4, then entering a heat treatment box 5, heating the heating oven for 90cm, the heating temperature is 100 ℃, then entering a reinforcing particle groove 6, attaching reinforcing particle sand 12 on the outermost layer, uniformly attaching the reinforcing particle sand 6 on the outer layer of the composite material under the action of a vibration device 7, finally entering the curing box 8 together for curing and forming, wherein the curing temperature is 150 ℃ and the fiber advancing speed is 600mm/min.
Example two
Taking the preparation of thermoplastic resin matrix composite reinforcing ribs formed by aramid fibers of an inner layer, basalt fibers of an outer layer and kaolin of an outermost layer as an example.
The inner reinforcing fiber 49 bundles of 6K aramid fibers are arranged on the creel 1, and then a nylon resin system is impregnated through the impregnation tank 2, and the impregnation tank in the second embodiment adopts a closed type heating and pressurizing glue injection impregnation tank at the temperature of 230 ℃ and 5MPa because nylon is in a solid state. The pre-curing is carried out through a pre-curing box 3, the diameter of the curing box is 3mm, the length is 90cm, a heating section is arranged every 30cm, the thermoplastic composite material is required to be cooled and molded, the pre-curing box 3 does not need to be heated at the moment, the crystallinity of the composite material reaches 55% when the composite material comes out of the curing box 3, then the winding fiber 3 bundles 6K basalt fiber which is impregnated with nylon resin powder resin is driven by a glue adding device 9 to wind on the inner composite material under the driving of a winding machine set 4, then the composite material enters a heat treatment box 5, the heat treatment oven is 90cm long, the heating temperature is 150 ℃, the thermoplastic composite material has certain strength, the surface is in a viscous state, then the thermoplastic composite material enters a reinforced particle groove 6, the reinforced particle sand 12 is adhered on the outermost layer, the reinforced particle sand 6 is uniformly adhered on the outer layer of the composite material under the action of a vibration device 7, finally the composite material enters the curing box 8 for curing and molding, and the curing box at the moment does not heat, and the fiber advancing speed is 700mm/min.
In the invention, the conditions of the preparation method are different, the performance of the obtained surface enhanced resin matrix composite reinforcing ribs is different, and in order to better prove the performance of the surface enhanced resin matrix composite reinforcing ribs prepared by the invention, which has the advantages of high friction force, stronger binding force with a base material and better reinforcing effect, the following comparative example is constructed:
comparative example 1:
the surface-enhanced resin matrix composite reinforcing ribs are not covered with reinforcing particles any more, but are fastened and connected with a base material such as concrete through a surface screw structure, and the other conditions are the same as those of example 1, and the preparation and use methods are the same as those of example 1.
The surface-enhanced resin-based composite reinforcing bars prepared in example 1 and comparative example 1 above were tested for binding force properties with a base material, i.e., force applied when the reinforcing bars were pulled out from the base material, and the test results are shown in table 1.
TABLE 1
| Inspection item | Example 1 | Comparative example 1 |
| Extraction force from base material | 80kN | 50kN |
As can be seen from Table 1, the surface-enhanced resin matrix composite reinforcing bars of the present invention have stronger binding force with the base material and better reinforcing effect than those of comparative example 1.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the present invention.
Claims (7)
1. The preparation method of the surface enhanced resin matrix composite reinforcing rib is characterized in that the surface enhanced resin matrix composite reinforcing rib comprises an internal reinforced fiber resin matrix composite, an outer winding layer and an outermost reinforcing particle, wherein the reinforced fiber is formed for the first time through a pultrusion process after being impregnated with a resin matrix, then the outer layer of the pultruded composite is wound with a second layer of the pultruded resin matrix, and finally the surface reinforced particle is covered in a semi-cured state for re-curing forming; the method comprises the following specific steps:
step 1: arranging the internal reinforcing fibers on a creel, then impregnating a resin matrix through a gum dipping tank, and pre-curing through a pre-curing box;
step 2: winding fibers impregnated with the resin matrix by the glue adding device are wound on the inner composite material under the driving of a winding unit;
step 3: entering a reinforced particle groove, attaching reinforced particles on the outermost layer, and then entering a curing box together for curing and molding;
in the step 3, the specific mode of adhering the reinforcing particles on the outermost layer is that the semi-solidified composite material enters a groove filled with the reinforcing particles, and a vibration device is arranged at the bottom of the groove filled with the reinforcing particles so that the reinforcing particles are uniformly adhered on the outer layer of the composite material.
2. The method for preparing the surface-enhanced resin-based composite material reinforcing rib according to claim 1, wherein the surface-enhanced particles are covered in a semi-cured state, and the re-curing molding is performed in a specific mode that the semi-cured composite material enters a groove filled with the enhanced particles, and a vibration device is arranged at the bottom of the groove filled with the enhanced particles so as to uniformly adhere the enhanced particles to the outer layer of the composite material;
the reinforced particles comprise one or more of sand, silicon dioxide, glass beads, barium sulfate and kaolin.
3. The method for preparing the surface-enhanced resin-based composite material reinforcing rib according to claim 2, wherein the fiber is one or more of carbon fiber, glass fiber, basalt fiber, aramid fiber, polyethylene fiber and silicon carbide fiber.
4. A method of preparing a surface enhanced resin matrix composite reinforcing bar according to claim 3, the resin matrix comprising a thermosetting resin system and/or a thermoplastic resin system, wherein:
the thermosetting resin system is one or more of an epoxy resin system, a phenolic resin system and a vinyl resin system;
the thermoplastic resin system is one or more of polypropylene, nylon, thermoplastic polyester resin, polyphenylene sulfide resin and polyether-ether-ketone resin.
5. The method for preparing a surface-enhanced resin matrix composite reinforcing rib according to claim 1, wherein in the step 1, the degree of pre-curing is 60% or less.
6. The method for preparing a surface-enhanced resin matrix composite reinforcing rib according to claim 4, wherein if the resin matrix in the step 1 is in a solid state, the impregnation tank is a closed type heated and pressurized impregnation tank, and if the resin matrix in the step 1 is a thermosetting resin system, the pre-curing tank is required to be heated.
7. The method for preparing the surface-enhanced resin-based composite material reinforcing rib according to claim 1, wherein in the step 2, the reinforcing rib is subjected to heat treatment in a heat treatment box after being wound.
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