CN114103292A - Prestressed carbon plate material for bridge reinforcement - Google Patents

Prestressed carbon plate material for bridge reinforcement Download PDF

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Publication number
CN114103292A
CN114103292A CN202111530644.8A CN202111530644A CN114103292A CN 114103292 A CN114103292 A CN 114103292A CN 202111530644 A CN202111530644 A CN 202111530644A CN 114103292 A CN114103292 A CN 114103292A
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carbon fiber
tantalum
solution
prestressed
resin material
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CN114103292B (en
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林文丹
李刚
黄必文
郑斯祥
邓辉尧
邱诗砚
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Shanxi Yude New Materials Technology Co ltd
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Guangdong Huacai Composite Material Co ltd
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    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
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    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
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    • B32—LAYERED PRODUCTS
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    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
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    • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
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    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
    • C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
    • C08G59/40—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the curing agents used
    • C08G59/50—Amines
    • C08G59/5006—Amines aliphatic
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
    • C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
    • C08G59/40—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the curing agents used
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    • C08G59/5033—Amines aromatic
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    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K7/00—Use of ingredients characterised by shape
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    • C08K9/04—Ingredients treated with organic substances
    • C08K9/06—Ingredients treated with organic substances with silicon-containing compounds
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    • B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
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    • B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
    • B32B2260/04—Impregnation, embedding, or binder material
    • B32B2260/046—Synthetic resin
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    • B32—LAYERED PRODUCTS
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    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/10—Inorganic fibres
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Abstract

The invention discloses a prestressed carbon plate material for a bridge reinforcement, which comprises a carbon fiber material and a resin material; wherein the mass fraction of the resin material is 41.2-44.6%; the carbon fiber material is obtained by activating carbon fiber yarns; the resin material comprises the following components in parts by weight: 100-120 parts of epoxy resin, 7-13 parts of modified tantalum selenide, 12-16 parts of reactive diluent and 30-50 parts of curing agent. The invention discloses a prestressed carbon plate material for a bridge reinforcing member, which has excellent mechanical property, good impact resistance and good wear resistance, can be better used in the reinforcing construction of a bridge, improves the interlaminar shearing force, is more convenient and effective to clamp and applies prestress to the carbon plate material.

Description

Prestressed carbon plate material for bridge reinforcement
Technical Field
The invention relates to the field of bridge reinforcement, in particular to a prestressed carbon plate material for a bridge reinforcement.
Background
With the development of economic construction, the number of vehicles is rapidly increased, heavy-duty vehicles and special overweight vehicles are increased day by day, the safety structure of the existing bridge is adversely affected, and part of the bridge needs to be reinforced or maintained so as to meet the requirement of continuously increasing load. The carbon plate or the carbon cloth is stuck on the bridge structure, which is the most common mode adopted in the prior bridge reinforcing construction, and the carbon plate has high tensile strength, elastic modulus and ultimate elongation, so that the carbon cloth is gradually replaced. The prestressed carbon plate is a prestressed carbon fiber plate, and is a plate made of carbon fibers. The prestress carbon fiber plate reinforcement belongs to an active reinforcement technology, utilizes the material characteristics of the height and high elasticity of the carbon fiber plate, generates initial prestress by pretensioning the carbon fiber plate, and is used for balancing a part of load of an original beam, so that the development of cracks is delayed to a great extent, the width of the cracks is reduced, the structural rigidity is effectively increased, the deflection of structural members is reduced, the strain of internal reinforcing steel bars is relieved, and the yield load of the reinforcing steel bars and the ultimate bearing capacity of the structure are improved.
At present, the preparation method of the prestressed carbon plate generally comprises the following steps: firstly, obtaining a carbon plate through pultrusion, and then clamping the carbon plate by adopting a clamp to apply prestress to obtain the prestressed carbon plate. However, since the carbon fiber material is a linear elastic material, the carbon fiber material is not subjected to yielding in the damage process, the damage form is brittle damage, and the impact resistance is poor, so that the use safety of the material is reduced; meanwhile, the carbon fiber plate is usually molded after being impregnated with epoxy resin in the production process, and the epoxy resin is easy to crack and wrinkle, so that the shearing force between layers of the carbon fiber plate is low, and the common anchor clamp is difficult to effectively clamp so as to apply prestress; in addition, the whole wear resistance of the existing carbon fiber plate is not enough, and the long-term use easily causes surface wear to influence the load capacity of the bridge.
Disclosure of Invention
Aiming at the problems of poor impact resistance, low interlaminar shear force and insufficient wear resistance of the prestressed carbon plate material in the prior art, the invention aims to provide the prestressed carbon plate material for the bridge reinforcing member.
The purpose of the invention is realized by adopting the following technical scheme:
a prestressed carbon plate material for a bridge reinforcement comprises a carbon fiber material and a resin material; wherein the mass fraction of the resin material is 41.2-44.6%; the carbon fiber material is obtained by activating carbon fiber yarns; the resin material comprises the following components in parts by weight:
100-120 parts of epoxy resin, 7-13 parts of modified tantalum selenide, 12-16 parts of reactive diluent and 30-50 parts of curing agent.
Preferably, the epoxy resin is a bisphenol a type epoxy resin or a bisphenol F type epoxy resin.
Preferably, the reactive diluent is at least one of ethylene glycol glycidyl ether, hexanediol glycidyl ether and diethylene glycol glycidyl ether.
Preferably, the curing agent is obtained by mixing m-phenylenediamine and triethylene tetramine according to a mass ratio of 1: 2-4.
Preferably, the carbon fiber yarn is one of 3K, 6K, 12K and 24K in model.
Preferably, the preparation method of the modified tantalum selenide comprises the following steps:
s1, material preparation:
mixing tantalum ethoxide and N-aminoethyl piperazine according to the mass ratio of 1: 6-10 to form tantalum ethoxide solution; mixing potassium selenite with deionized water according to the mass ratio of 1: 8-12 to form a potassium selenite solution;
s2, preparing tantalum selenide powder:
placing a potassium selenite solution in a water bath at 50-60 ℃, starting stirring, continuously dropwise adding an ethanol tantalum solution, continuing stirring at room temperature for 0.5-1 h after the addition is finished, then transferring into a reaction kettle, placing the reaction kettle in a condition of 160-180 ℃, preserving heat for 20-24 h, centrifuging the reaction solution after the reaction is finished, sequentially washing the reaction solution for three times by using distilled water and acetone, drying under reduced pressure, and crushing to obtain tantalum selenide powder; wherein the mass ratio of the potassium selenite solution to the tantalum ethoxide solution is 1: 2.1-2.5;
s3, preparing modified tantalum selenide:
mixing 2, 4-diamino-6-hydroxypyrimidine and thymol into a Tris-HCl buffer solution, adding tantalum selenide powder after fully mixing, stirring for 6-10 hours at room temperature after uniformly dispersing by ultrasonic, centrifuging to collect obtained solid powder, washing with distilled water for at least three times, and drying under reduced pressure to obtain modified tantalum selenide; wherein the mass ratio of the 2, 4-diamino-6-hydroxypyrimidine, the thymol and the Tris-HCl buffer solution is 0.2-0.6: 1: 6-10, and the mass ratio of the tantalum selenide powder and the Tris-HCl buffer solution is 1: 4-6.
Preferably, in the step S2, the particle size of the obtained tantalum selenide powder is 300 to 800 nm.
Preferably, in the S3, the pH of the Tris-HCl buffer solution is 8.0-8.8.
Preferably, in the step S3, the centrifugation is performed in a centrifuge with the rotation speed of 8000-10000 rpm.
Preferably, the preparation method of the carbon fiber material comprises the following steps:
p1, placing the carbon fiber filaments in an ethanol solution with the mass fraction of 50-80% for ultrasonic treatment for 1-3 h, taking out the carbon fiber filaments, and draining to obtain pre-impregnated carbon fiber filaments;
p2, adding the preimpregnated carbon fiber filaments into an acetic acid solution with the mass fraction of 15% -25%, dropwise adding vinyl trimethoxy silane, stirring at room temperature for 4-6 h, taking out, draining, washing with distilled water for at least three times, and drying under reduced pressure to obtain a carbon fiber material; wherein the mass ratio of the preimpregnated carbon fiber filaments to the vinyl trimethoxy silane to the acetic acid solution is 1: 0.02-0.05: 6-10.
Preferably, the preparation method of the prestressed carbon plate material for the bridge reinforcement comprises the following steps:
weighing epoxy resin, modified tantalum selenide and an active diluent into a stirrer according to the weight, fully mixing, adding a curing agent, and uniformly mixing again to obtain a resin material;
step two, interweaving the carbon fiber material according to a warp and weft arrangement mode, and then cutting the carbon fiber material into a proper shape to obtain a carbon fiber wire layer;
step three, coating the resin material on the impregnated paper with the release agent on the surface through a coating machine to obtain resin material paper;
placing the carbon fiber yarn layer between two layers of resin material paper, rolling by a high-pressure hot roller to enable the carbon fiber yarn layer to fully soak the resin material, and cooling to obtain carbon fiber prepreg; wherein, the two layers of resin material paper are placed in the direction that one side coated with the resin material faces the carbon fiber silk layer;
step five, stacking and laying a plurality of layers of carbon fiber prepregs up and down according to requirements to obtain a carbon fiber lamination;
and step six, placing the carbon fiber laminate in a mold for hot press molding, and cooling to obtain the prestressed carbon plate material for the bridge reinforcement.
Preferably, in the second step, the carbon fiber material is interwoven in a plain weave from top to bottom.
Preferably, in the fourth step, the rolling temperature is 80-120 ℃, and the rolling speed is 2-4 m/min.
Preferably, in the fifth step, the angle of laying between every two layers of carbon fiber prepregs is +45 degrees or-45 degrees.
Preferably, in the sixth step, the temperature of the hot press molding is set to be 120-180 ℃.
The invention has the beneficial effects that:
the invention discloses a prestressed carbon plate material for a bridge reinforcing member, which has excellent mechanical property, good impact resistance and good wear resistance, can be better used in the reinforcing construction of a bridge, improves the interlaminar shearing force, is more convenient and effective to clamp and applies prestress to the carbon plate material.
The carbon plate material of the invention uses carbon fiber filaments which are subjected to ultrasonic impurity removal by ethanol solution and then activated by vinyl trimethoxy silane in acetic acid solution, so that the obtained carbon fiber filaments have stronger surface activity and are favorable for bonding with subsequent resin materials.
The resin material is prepared by adding the self-made modified tantalum selenide into the epoxy resin, the performance of the resin material formed by compounding is better, and the carbon fiber wire is subjected to activation treatment, so that the prepared and synthesized carbon plate material can be excellent.
According to the invention, m-phenylenediamine and triethylene tetramine selected as the curing agents are amine curing agents, wherein the triethylene tetramine belongs to a low-temperature curing agent, the m-phenylenediamine belongs to a high-temperature curing agent, and after the m-phenylenediamine and the low-temperature curing agent are mixed and used, the carbon fibers can be partially cured at a lower temperature after being rolled subsequently, so that the adhesion of resin to the carbon fibers is enhanced, and then the carbon fibers are completely cured at a higher temperature in the hot-press forming process, so that the binding force between carbon fiber filament layers is further enhanced.
According to the invention, 2, 4-diamino-6-hydroxypyrimidine and thymol are subjected to a combination reaction under the condition of a Tris-HCl buffer solution, and a product generated by combination is deposited on the surface of tantalum selenide powder, so that the modified tantalum selenide is formed. Under alkaline conditions, phenolic hydroxyl groups in thymol are oxidized into quinone groups, and then combined with amino groups in 2, 4-diamino-6-hydroxypyrimidine to generate Michael addition (Michael addition) reaction, and the generated product is attached to the surface of tantalum selenide powder to form a composite thin layer.
According to the invention, tantalum ethoxide and potassium selenite react under certain conditions to prepare the tantalum selenide powder, and then the tantalum selenide powder is subjected to modification treatment, so that the modified tantalum selenide powder has stronger activity due to the formation of an organic composite thin layer on the surface, and the interfacial interaction between the modified tantalum selenide powder and epoxy resin can be promoted. The addition of the modified tantalum selenide powder improves the toughness, strength and high temperature resistance of the epoxy resin.
Detailed Description
For the purpose of more clearly illustrating the present invention and more clearly understanding the technical features, objects and advantages of the present invention, the technical solutions of the present invention will now be described in detail below, but are not to be construed as limiting the implementable scope of the present invention.
The invention is further described below with reference to the following examples.
Example 1
A prestressed carbon plate material for a bridge reinforcement comprises a carbon fiber material and a resin material; wherein the mass fraction of the resin material is 42.8%; the carbon fiber material is obtained by activating carbon fiber wires with the model number of 6K; the resin material comprises the following components in parts by weight:
110 parts of bisphenol A type epoxy resin, 10 parts of modified tantalum selenide, 14 parts of glycol glycidyl ether and 40 parts of curing agent; the curing agent is obtained by mixing m-phenylenediamine and triethylene tetramine according to the mass ratio of 1: 3.
The preparation method of the modified tantalum selenide comprises the following steps:
s1, mixing tantalum ethoxide and N-aminoethyl piperazine according to a mass ratio of 1:8 to form a tantalum ethoxide solution; mixing potassium selenite with deionized water according to the mass ratio of 1:10 to form a potassium selenite solution;
s2, placing the potassium selenite solution in a water bath at 50-60 ℃, starting stirring, continuously dropwise adding the tantalum ethoxide solution, continuing stirring at room temperature for 0.5-1 h after the addition is finished, then transferring into a reaction kettle, placing the reaction kettle in a condition of 160-180 ℃, preserving heat for 20-24 h, centrifuging the reaction solution after the reaction is finished, sequentially washing the reaction solution for three times by using distilled water and acetone, drying under reduced pressure, and crushing to obtain tantalum selenide powder with the particle size of 300-800 nm; wherein the mass ratio of the potassium selenite solution to the tantalum ethoxide solution is 1: 2.3;
s3, mixing 2, 4-diamino-6-hydroxypyrimidine and thymol into Tris-HCl buffer solution with the pH value of 8.5, fully mixing, adding tantalum selenide powder, ultrasonically dispersing uniformly, stirring for 6-10 hours at room temperature, centrifuging in a centrifuge with the rotation speed of 8000-10000 rpm, collecting obtained solid powder, washing with distilled water for at least three times, and drying under reduced pressure to obtain modified tantalum selenide; wherein the mass ratio of the 2, 4-diamino-6-hydroxypyrimidine, the thymol and the Tris-HCl buffer solution is 0.4:1:8, and the mass ratio of the tantalum selenide powder and the Tris-HCl buffer solution is 1: 5.
The preparation method of the carbon fiber material comprises the following steps:
p1, placing the carbon fiber wire with the model of 6K in an ethanol solution with the mass fraction of 60% for ultrasonic treatment for 1-3 h, taking out, and draining to obtain a pre-impregnated carbon fiber wire;
p2, adding the preimpregnated carbon fiber filaments into an acetic acid solution with the mass fraction of 20%, dropwise adding vinyl trimethoxy silane, stirring at room temperature for 4-6 hours, taking out, draining, washing with distilled water for at least three times, and drying under reduced pressure to obtain a carbon fiber material; wherein the mass ratio of the preimpregnated carbon fiber filaments to the vinyl trimethoxy silane to the acetic acid solution is 1:0.03: 8.
The preparation method of the prestressed carbon plate material for the bridge reinforcing member comprises the following steps:
weighing bisphenol A type epoxy resin, modified tantalum selenide and ethylene glycol glycidyl ether according to the weight, putting the materials into a stirrer, fully mixing, adding a curing agent, and uniformly mixing again to obtain a resin material;
step two, interweaving the carbon fiber material in a plain weave mode of arranging a warp and a weft one above the other, and then cutting the carbon fiber material into a proper shape to obtain a carbon fiber wire layer;
step three, coating the resin material on the impregnated paper with the release agent on the surface through a coating machine to obtain resin material paper;
placing the carbon fiber yarn layer between two layers of resin material paper, rolling by a high-pressure hot roller at the temperature of 100 ℃ at the rolling speed of 3m/min to enable the carbon fiber yarn layer to fully soak the resin material, and cooling to obtain a carbon fiber prepreg; wherein, the two layers of resin material paper are placed in the direction that one side coated with the resin material faces the carbon fiber silk layer;
fifthly, stacking and laying a plurality of layers of carbon fiber prepregs up and down according to needs, wherein the laying angle between every two layers of carbon fiber prepregs is +45 degrees, and thus obtaining a carbon fiber lamination;
and step six, placing the carbon fiber laminate in a mold, performing hot press molding at the temperature of 150 ℃, and cooling to obtain the prestressed carbon plate material for the bridge reinforcement.
Example 2
A prestressed carbon plate material for a bridge reinforcement comprises a carbon fiber material and a resin material; wherein the mass fraction of the resin material is 41.2%; the carbon fiber material is obtained by activating carbon fiber wires with the model number of 3K; the resin material comprises the following components in parts by weight:
100 parts of bisphenol F epoxy resin, 7 parts of modified tantalum selenide, 12 parts of hexanediol glycidyl ether and 30 parts of curing agent; the curing agent is obtained by mixing m-phenylenediamine and triethylene tetramine according to the mass ratio of 1:2.
The preparation method of the modified tantalum selenide comprises the following steps:
s1, mixing tantalum ethoxide and N-aminoethyl piperazine according to a mass ratio of 1:6 to form tantalum ethoxide solution; mixing potassium selenite with deionized water according to the mass ratio of 1:8 to form a potassium selenite solution;
s2, placing the potassium selenite solution in a water bath at 50-60 ℃, starting stirring, continuously dropwise adding the tantalum ethoxide solution, continuing stirring at room temperature for 0.5-1 h after the addition is finished, then transferring into a reaction kettle, placing the reaction kettle in a condition of 160-180 ℃, preserving heat for 20-24 h, centrifuging the reaction solution after the reaction is finished, sequentially washing the reaction solution for three times by using distilled water and acetone, drying under reduced pressure, and crushing to obtain tantalum selenide powder with the particle size of 300-800 nm; wherein the mass ratio of the potassium selenite solution to the tantalum ethoxide solution is 1: 2.1;
s3, mixing 2, 4-diamino-6-hydroxypyrimidine and thymol into Tris-HCl buffer solution with the pH value of 8.0, fully mixing, adding tantalum selenide powder, ultrasonically dispersing uniformly, stirring for 6-10 hours at room temperature, centrifuging in a centrifuge with the rotation speed of 8000-10000 rpm, collecting obtained solid powder, washing with distilled water for at least three times, and drying under reduced pressure to obtain modified tantalum selenide; wherein the mass ratio of the 2, 4-diamino-6-hydroxypyrimidine, the thymol and the Tris-HCl buffer solution is 0.2:1:6, and the mass ratio of the tantalum selenide powder and the Tris-HCl buffer solution is 1: 4.
The preparation method of the carbon fiber material comprises the following steps:
p1, placing the carbon fiber wire with the model of 3K in an ethanol solution with the mass fraction of 50% for ultrasonic treatment for 1-3 h, taking out, and draining to obtain a pre-impregnated carbon fiber wire;
p2, adding the preimpregnated carbon fiber filaments into an acetic acid solution with the mass fraction of 15%, dropwise adding vinyl trimethoxy silane, stirring at room temperature for 4-6 hours, taking out, draining, washing with distilled water for at least three times, and drying under reduced pressure to obtain a carbon fiber material; wherein the mass ratio of the preimpregnated carbon fiber filaments to the vinyl trimethoxy silane to the acetic acid solution is 1:0.02: 6.
The preparation method of the prestressed carbon plate material for the bridge reinforcing member comprises the following steps:
weighing bisphenol F type epoxy resin, modified tantalum selenide and hexanediol glycidyl ether according to the weight into a stirrer, fully mixing, adding a curing agent, and uniformly mixing again to obtain a resin material;
step two, interweaving the carbon fiber material in a plain weave mode of arranging a warp and a weft one above the other, and then cutting the carbon fiber material into a proper shape to obtain a carbon fiber wire layer;
step three, coating the resin material on the impregnated paper with the release agent on the surface through a coating machine to obtain resin material paper;
placing the carbon fiber yarn layer between two layers of resin material paper, rolling by a high-pressure hot roller at the temperature of 120 ℃ at the rolling speed of 2m/min to enable the carbon fiber yarn layer to fully soak the resin material, and cooling to obtain a carbon fiber prepreg; wherein, the two layers of resin material paper are placed in the direction that one side coated with the resin material faces the carbon fiber silk layer;
fifthly, stacking and laying a plurality of layers of carbon fiber prepregs up and down according to needs, wherein the laying angle between every two layers of carbon fiber prepregs is-45 degrees, and thus obtaining a carbon fiber lamination;
and step six, placing the carbon fiber laminate in a mold, performing hot press molding at 120 ℃, and cooling to obtain the prestressed carbon plate material for the bridge reinforcement.
Example 3
A prestressed carbon plate material for a bridge reinforcement comprises a carbon fiber material and a resin material; wherein the mass fraction of the resin material is 44.6%; the carbon fiber material is obtained by activating carbon fiber wires with the model number of 12K; the resin material comprises the following components in parts by weight:
120 parts of bisphenol A epoxy resin, 13 parts of modified tantalum selenide, 16 parts of diethylene glycol glycidyl ether and 50 parts of curing agent; the curing agent is obtained by mixing m-phenylenediamine and triethylene tetramine according to the mass ratio of 1: 2-4.
The preparation method of the modified tantalum selenide comprises the following steps:
s1, mixing tantalum ethoxide and N-aminoethyl piperazine according to a mass ratio of 1:10 to form a tantalum ethoxide solution; mixing potassium selenite with deionized water according to the mass ratio of 1:12 to form a potassium selenite solution;
s2, placing the potassium selenite solution in a water bath at 50-60 ℃, starting stirring, continuously dropwise adding the tantalum ethoxide solution, continuing stirring at room temperature for 0.5-1 h after the addition is finished, then transferring into a reaction kettle, placing the reaction kettle in a condition of 160-180 ℃, preserving heat for 20-24 h, centrifuging the reaction solution after the reaction is finished, sequentially washing the reaction solution for three times by using distilled water and acetone, drying under reduced pressure, and crushing to obtain tantalum selenide powder with the particle size of 300-800 nm; wherein the mass ratio of the potassium selenite solution to the tantalum ethoxide solution is 1: 2.5;
s3, mixing 2, 4-diamino-6-hydroxypyrimidine and thymol into Tris-HCl buffer solution with the pH value of 8.8, fully mixing, adding tantalum selenide powder, ultrasonically dispersing uniformly, stirring for 6-10 hours at room temperature, centrifuging in a centrifuge with the rotation speed of 8000-10000 rpm, collecting obtained solid powder, washing with distilled water for at least three times, and drying under reduced pressure to obtain modified tantalum selenide; wherein the mass ratio of the 2, 4-diamino-6-hydroxypyrimidine, the thymol and the Tris-HCl buffer solution is 0.6:1:10, and the mass ratio of the tantalum selenide powder and the Tris-HCl buffer solution is 1: 6.
The preparation method of the carbon fiber material comprises the following steps:
p1, placing the carbon fiber wire with the model of 12K in an ethanol solution with the mass fraction of 80% for ultrasonic treatment for 1-3 h, taking out, and draining to obtain a pre-impregnated carbon fiber wire;
p2, adding the preimpregnated carbon fiber filaments into an acetic acid solution with the mass fraction of 25%, dropwise adding vinyl trimethoxy silane, stirring at room temperature for 4-6 hours, taking out, draining, washing with distilled water for at least three times, and drying under reduced pressure to obtain a carbon fiber material; wherein the mass ratio of the preimpregnated carbon fiber filaments to the vinyl trimethoxy silane to the acetic acid solution is 1:0.05: 10.
The preparation method of the prestressed carbon plate material for the bridge reinforcing member comprises the following steps:
weighing bisphenol A type epoxy resin, modified tantalum selenide and diethylene glycol glycidyl ether according to the weight, putting the materials into a stirrer, fully mixing, adding a curing agent, and uniformly mixing again to obtain a resin material;
step two, interweaving the carbon fiber material in a plain weave mode of arranging a warp and a weft one above the other, and then cutting the carbon fiber material into a proper shape to obtain a carbon fiber wire layer;
step three, coating the resin material on the impregnated paper with the release agent on the surface through a coating machine to obtain resin material paper;
placing the carbon fiber yarn layer between two layers of resin material paper, rolling by a high-pressure hot roller at the temperature of 80 ℃ at the rolling speed of 4m/min to enable the carbon fiber yarn layer to fully soak the resin material, and cooling to obtain a carbon fiber prepreg; wherein, the two layers of resin material paper are placed in the direction that one side coated with the resin material faces the carbon fiber silk layer;
fifthly, stacking and laying a plurality of layers of carbon fiber prepregs up and down according to needs, wherein the laying angle between every two layers of carbon fiber prepregs is +45 degrees, and thus obtaining a carbon fiber lamination;
and step six, placing the carbon fiber laminate in a mold, performing hot press molding at 180 ℃, and cooling to obtain the prestressed carbon plate material for the bridge reinforcement.
Comparative example 1
A prestressed carbon plate material for a bridge reinforcement comprises a carbon fiber material and a resin material; wherein the mass fraction of the resin material is 42.8%; the carbon fiber material is obtained by activating carbon fiber wires with the model number of 6K; the resin material comprises the following components in parts by weight:
110 parts of bisphenol A type epoxy resin, 10 parts of tantalum selenide, 14 parts of ethylene glycol glycidyl ether and 40 parts of curing agent; the curing agent is obtained by mixing m-phenylenediamine and triethylene tetramine according to the mass ratio of 1: 3.
The preparation method of the tantalum selenide comprises the following steps:
s1, mixing tantalum ethoxide and N-aminoethyl piperazine according to a mass ratio of 1:8 to form a tantalum ethoxide solution;
s2, placing the potassium selenite solution in a water bath at 50-60 ℃, starting stirring, continuously dropwise adding the tantalum ethoxide solution, continuing stirring at room temperature for 0.5-1 h after the addition is finished, then transferring into a reaction kettle, placing the reaction kettle in a condition of 160-180 ℃, preserving heat for 20-24 h, centrifuging the reaction solution after the reaction is finished, sequentially washing the reaction solution for three times by using distilled water and acetone, drying under reduced pressure, and crushing to obtain tantalum selenide powder with the particle size of 300-800 nm; wherein the mass ratio of the potassium selenite solution to the tantalum ethoxide solution is 1: 2.3.
The preparation method of the carbon fiber material comprises the following steps:
p1, placing the carbon fiber wire with the model of 6K in an ethanol solution with the mass fraction of 60% for ultrasonic treatment for 1-3 h, taking out, and draining to obtain a pre-impregnated carbon fiber wire;
p2, adding the preimpregnated carbon fiber filaments into an acetic acid solution with the mass fraction of 20%, dropwise adding vinyl trimethoxy silane, stirring at room temperature for 4-6 hours, taking out, draining, washing with distilled water for at least three times, and drying under reduced pressure to obtain a carbon fiber material; wherein the mass ratio of the preimpregnated carbon fiber filaments to the vinyl trimethoxy silane to the acetic acid solution is 1:0.03: 8.
The preparation method of the prestressed carbon plate material for the bridge reinforcing member comprises the following steps:
weighing bisphenol A epoxy resin, tantalum selenide and ethylene glycol glycidyl ether according to the weight, putting the bisphenol A epoxy resin, the tantalum selenide and the ethylene glycol glycidyl ether into a stirrer, adding a curing agent after mixing fully, and mixing uniformly again to obtain a resin material;
step two, interweaving the carbon fiber material in a plain weave mode of arranging a warp and a weft one above the other, and then cutting the carbon fiber material into a proper shape to obtain a carbon fiber wire layer;
step three, coating the resin material on the impregnated paper with the release agent on the surface through a coating machine to obtain resin material paper;
placing the carbon fiber yarn layer between two layers of resin material paper, rolling by a high-pressure hot roller at the temperature of 100 ℃ at the rolling speed of 3m/min to enable the carbon fiber yarn layer to fully soak the resin material, and cooling to obtain a carbon fiber prepreg; wherein, the two layers of resin material paper are placed in the direction that one side coated with the resin material faces the carbon fiber silk layer;
fifthly, stacking and laying a plurality of layers of carbon fiber prepregs up and down according to needs, wherein the laying angle between every two layers of carbon fiber prepregs is +45 degrees, and thus obtaining a carbon fiber lamination;
and step six, placing the carbon fiber laminate in a mold, performing hot press molding at the temperature of 150 ℃, and cooling to obtain the prestressed carbon plate material for the bridge reinforcement.
Comparative example 2
A prestressed carbon plate material for a bridge reinforcement comprises a carbon fiber material and a resin material; wherein the mass fraction of the resin material is 42.8%; the carbon fiber material is obtained by activating carbon fiber wires with the model number of 6K; the resin material comprises the following components in parts by weight:
110 parts of bisphenol A type epoxy resin, 14 parts of ethylene glycol glycidyl ether and 40 parts of curing agent; the curing agent is obtained by mixing m-phenylenediamine and triethylene tetramine according to the mass ratio of 1: 3.
The preparation method of the carbon fiber material comprises the following steps:
p1, placing the carbon fiber wire with the model of 6K in an ethanol solution with the mass fraction of 60% for ultrasonic treatment for 1-3 h, taking out, and draining to obtain a pre-impregnated carbon fiber wire;
p2, adding the preimpregnated carbon fiber filaments into an acetic acid solution with the mass fraction of 20%, dropwise adding vinyl trimethoxy silane, stirring at room temperature for 4-6 hours, taking out, draining, washing with distilled water for at least three times, and drying under reduced pressure to obtain a carbon fiber material; wherein the mass ratio of the preimpregnated carbon fiber filaments to the vinyl trimethoxy silane to the acetic acid solution is 1:0.03: 8.
The preparation method of the prestressed carbon plate material for the bridge reinforcing member comprises the following steps:
weighing bisphenol A type epoxy resin and ethylene glycol glycidyl ether according to the amount, putting the bisphenol A type epoxy resin and the ethylene glycol glycidyl ether into a stirrer, adding a curing agent after mixing fully, and mixing uniformly again to obtain a resin material;
step two, interweaving the carbon fiber material in a plain weave mode of arranging a warp and a weft one above the other, and then cutting the carbon fiber material into a proper shape to obtain a carbon fiber wire layer;
step three, coating the resin material on the impregnated paper with the release agent on the surface through a coating machine to obtain resin material paper;
placing the carbon fiber yarn layer between two layers of resin material paper, rolling by a high-pressure hot roller at the temperature of 100 ℃ at the rolling speed of 3m/min to enable the carbon fiber yarn layer to fully soak the resin material, and cooling to obtain a carbon fiber prepreg; wherein, the two layers of resin material paper are placed in the direction that one side coated with the resin material faces the carbon fiber silk layer;
fifthly, stacking and laying a plurality of layers of carbon fiber prepregs up and down according to needs, wherein the laying angle between every two layers of carbon fiber prepregs is +45 degrees, and thus obtaining a carbon fiber lamination;
and step six, placing the carbon fiber laminate in a mold, performing hot press molding at the temperature of 150 ℃, and cooling to obtain the prestressed carbon plate material for the bridge reinforcement.
In order to more clearly illustrate the invention, the prestressed carbon plate materials prepared in the embodiments 1-3 and the comparative example of the invention are all prepared to have a thickness of (0.5 +/-0.01) mm, and the performance detection and comparison are carried out, wherein the tensile strength, the bending strength, the compressive strength and the impact strength are detected according to the standards GB/T1447-; the interlaminar shear strength is detected according to the standard GB/T1450.1-2005, and the abrasion loss is detected according to the standard GB/T3960-2016.
The results are shown in table 1:
table 1 testing of properties of prestressed carbon sheet materials
Example 1 Example 2 Example 3 Comparative example 1 Comparative example 2
Tensile Strength (MPa) 578 562 583 544 495
Compressive strength (MPa) 412 397 425 353 328
Flexural Strength (MPa) 406 381 414 329 284
Impact Strength (KJ/m)2) 83.2 72.5 78.7 62.9 55.3
Interlaminar shear strength (MPa) 93.8 96.5 94.3 77.2 67.3
Amount of abrasion (mg) 5.8 6.3 5.5 10.6 23.5
Table 1 shows that the prestressed carbon plate materials prepared in embodiments 1 to 3 of the present invention have better mechanical properties, compressive properties, toughness, interlaminar shear resistance, and wear resistance.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims (10)

1. A prestressed carbon plate material for a bridge reinforcement is characterized by comprising a carbon fiber material and a resin material; wherein the mass fraction of the resin material is 41.2-44.6%; the carbon fiber material is obtained by activating carbon fiber yarns; the resin material comprises the following components in parts by weight:
100-120 parts of epoxy resin, 7-13 parts of modified tantalum selenide, 12-16 parts of reactive diluent and 30-50 parts of curing agent.
2. A prestressed carbon plate material for a bridge reinforcement according to claim 1, wherein said epoxy resin is bisphenol a type epoxy resin or bisphenol F type epoxy resin.
3. A prestressed carbon slab material for a bridge reinforcement according to claim 1, wherein said reactive diluent is at least one of ethylene glycol glycidyl ether, hexylene glycol glycidyl ether and diethylene glycol glycidyl ether.
4. The prestressed carbon plate material for a bridge reinforcement according to claim 1, wherein the curing agent is a mixture of m-phenylenediamine and triethylene-tetramine in a mass ratio of 1: 2-4.
5. A prestressed carbon plate material for a bridge reinforcement according to claim 1, wherein said carbon fibre filaments are of one of the 3K, 6K, 12K and 24K type.
6. The prestressed carbon plate material for a bridge reinforcement according to claim 1, wherein the preparation method of the modified tantalum selenide comprises the following steps:
s1, material preparation:
mixing tantalum ethoxide and N-aminoethyl piperazine according to the mass ratio of 1: 6-10 to form tantalum ethoxide solution; mixing potassium selenite with deionized water according to the mass ratio of 1: 8-12 to form a potassium selenite solution;
s2, preparing tantalum selenide powder:
placing a potassium selenite solution in a water bath at 50-60 ℃, starting stirring, continuously dropwise adding an ethanol tantalum solution, continuing stirring at room temperature for 0.5-1 h after the addition is finished, then transferring into a reaction kettle, placing the reaction kettle in a condition of 160-180 ℃, preserving heat for 20-24 h, centrifuging the reaction solution after the reaction is finished, sequentially washing the reaction solution for three times by using distilled water and acetone, drying under reduced pressure, and crushing to obtain tantalum selenide powder; wherein the mass ratio of the potassium selenite solution to the tantalum ethoxide solution is 1: 2.1-2.5;
s3, preparing modified tantalum selenide:
mixing 2, 4-diamino-6-hydroxypyrimidine and thymol into a Tris-HCl buffer solution, adding tantalum selenide powder after fully mixing, stirring for 6-10 hours at room temperature after uniformly dispersing by ultrasonic, centrifuging to collect obtained solid powder, washing with distilled water for at least three times, and drying under reduced pressure to obtain modified tantalum selenide; wherein the mass ratio of the 2, 4-diamino-6-hydroxypyrimidine, the thymol and the Tris-HCl buffer solution is 0.2-0.6: 1: 6-10, and the mass ratio of the tantalum selenide powder and the Tris-HCl buffer solution is 1: 4-6.
7. The prestressed carbon plate material for a bridge reinforcement according to claim 6, wherein in S2, the grain size of the obtained tantalum selenide powder is 300-800 nm.
8. The prestressed carbon plate material for a bridge reinforcement according to claim 1, wherein the carbon fiber material is prepared by the following steps:
p1, placing the carbon fiber filaments in an ethanol solution with the mass fraction of 50-80% for ultrasonic treatment for 1-3 h, taking out the carbon fiber filaments, and draining to obtain pre-impregnated carbon fiber filaments;
p2, adding the preimpregnated carbon fiber filaments into an acetic acid solution with the mass fraction of 15% -25%, dropwise adding vinyl trimethoxy silane, stirring at room temperature for 4-6 h, taking out, draining, washing with distilled water for at least three times, and drying under reduced pressure to obtain a carbon fiber material; wherein the mass ratio of the preimpregnated carbon fiber filaments to the vinyl trimethoxy silane to the acetic acid solution is 1: 0.02-0.05: 6-10.
9. The prestressed carbon plate material for a bridge reinforcement according to claim 1, wherein the prestressed carbon plate material for a bridge reinforcement is prepared by the following steps:
weighing epoxy resin, modified tantalum selenide and an active diluent into a stirrer according to the weight, fully mixing, adding a curing agent, and uniformly mixing again to obtain a resin material;
step two, interweaving the carbon fiber material according to a warp and weft arrangement mode, and then cutting the carbon fiber material into a proper shape to obtain a carbon fiber wire layer;
step three, coating the resin material on the impregnated paper with the release agent on the surface through a coating machine to obtain resin material paper;
placing the carbon fiber yarn layer between two layers of resin material paper, rolling by a high-pressure hot roller to enable the carbon fiber yarn layer to fully soak the resin material, and cooling to obtain carbon fiber prepreg; wherein, the two layers of resin material paper are placed in the direction that one side coated with the resin material faces the carbon fiber silk layer;
step five, stacking and laying a plurality of layers of carbon fiber prepregs up and down according to requirements to obtain a carbon fiber lamination;
and step six, placing the carbon fiber laminate in a mold for hot press molding, and cooling to obtain the prestressed carbon plate material for the bridge reinforcement.
10. The prestressed carbon plate material for a bridge reinforcement according to claim 9, wherein in the fourth step, the rolling temperature is 80-120 ℃ and the rolling speed is 2-4 m/min.
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CN112300539A (en) * 2020-11-30 2021-02-02 常州市宏发纵横新材料科技股份有限公司 Preparation method of epoxy resin material for improving wettability of carbon fiber

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