CN116925325A - Capsule type curing agent, curing self-regulating fiber grid and construction method thereof - Google Patents
Capsule type curing agent, curing self-regulating fiber grid and construction method thereof Download PDFInfo
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- CN116925325A CN116925325A CN202310922505.2A CN202310922505A CN116925325A CN 116925325 A CN116925325 A CN 116925325A CN 202310922505 A CN202310922505 A CN 202310922505A CN 116925325 A CN116925325 A CN 116925325A
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- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 128
- 239000000835 fiber Substances 0.000 title claims abstract description 103
- 239000002775 capsule Substances 0.000 title claims abstract description 62
- 238000010276 construction Methods 0.000 title claims abstract description 43
- 239000004570 mortar (masonry) Substances 0.000 claims abstract description 84
- 239000003822 epoxy resin Substances 0.000 claims abstract description 50
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 50
- 238000000034 method Methods 0.000 claims abstract description 18
- LSDPWZHWYPCBBB-UHFFFAOYSA-N Methanethiol Chemical compound SC LSDPWZHWYPCBBB-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000011248 coating agent Substances 0.000 claims abstract description 3
- 238000000576 coating method Methods 0.000 claims abstract description 3
- 229920005989 resin Polymers 0.000 claims description 35
- 239000011347 resin Substances 0.000 claims description 35
- 239000004952 Polyamide Substances 0.000 claims description 31
- 229920002647 polyamide Polymers 0.000 claims description 31
- 150000001875 compounds Chemical class 0.000 claims description 27
- 229920001577 copolymer Polymers 0.000 claims description 26
- 238000001035 drying Methods 0.000 claims description 26
- 230000002787 reinforcement Effects 0.000 claims description 23
- 239000011159 matrix material Substances 0.000 claims description 15
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 claims description 14
- 239000004593 Epoxy Substances 0.000 claims description 11
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 11
- 229910052739 hydrogen Inorganic materials 0.000 claims description 11
- 239000001257 hydrogen Substances 0.000 claims description 11
- 239000002245 particle Substances 0.000 claims description 9
- 238000007788 roughening Methods 0.000 claims description 8
- 238000005507 spraying Methods 0.000 claims description 6
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- 239000012535 impurity Substances 0.000 claims description 4
- -1 E-73 ester Chemical class 0.000 claims description 3
- GYZLOYUZLJXAJU-UHFFFAOYSA-N diglycidyl ether Chemical compound C1OC1COCC1CO1 GYZLOYUZLJXAJU-UHFFFAOYSA-N 0.000 claims description 3
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 claims description 3
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 3
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 39
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- 229920002430 Fibre-reinforced plastic Polymers 0.000 description 1
- 239000006087 Silane Coupling Agent Substances 0.000 description 1
- 238000003854 Surface Print Methods 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- 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
- C08G59/188—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 using encapsulated compounds
-
- C—CHEMISTRY; METALLURGY
- 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
- C08G59/44—Amides
- C08G59/46—Amides together with other curing agents
-
- C—CHEMISTRY; METALLURGY
- 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
- C08G59/66—Mercaptans
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L63/00—Compositions of epoxy resins; Compositions of derivatives of epoxy resins
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Architecture (AREA)
- Electrochemistry (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Reinforced Plastic Materials (AREA)
Abstract
The application discloses a capsule type curing agent, a curing self-regulating fiber grid and a construction method thereof, and relates to the technical field of building reinforcing materials. The capsule curing agent comprises a shell and an inner core, wherein the shell comprises the following components in percentage by mass: 2-3, wherein the inner core is a mercaptan curing agent, and the mass ratio of the inner core to the outer shell is 1:0.5-1. The epoxy resin coating can be applied to fiber grids, can regulate and control the curing process of epoxy resin in the fiber grids, and has the advantages that the shell structure is consumed when hydration reaction releases heat, and the stability is good when the fiber grids are stored at low temperature; after the shell participates in the reaction, the internal high-activity curing agent reacts rapidly, and the epoxy resin is accelerated to be cured to be cooperated with the mortar in solidification. The cured self-regulating fiber grid provided by the application has good flexibility before construction, strong fitting property, easier construction and high rigidity and high load capacity after construction, thereby ensuring excellent reinforcing effect.
Description
Technical Field
The application relates to the technical field of building reinforcing materials, in particular to a capsule type curing agent, a curing self-regulating fiber grid and a construction method thereof.
Background
In order to respond to the low-carbon environmental protection policy, the application of carbon fiber materials in various industries is widely increased year by year, and the production and application trends of the carbon fiber materials are mature. The carbon fiber material is light and high in strength, is chemically inert, acid-resistant and alkali-resistant, so that the carbon fiber material is greatly colored in the field of building reinforcement, wherein the carbon fiber grid is used as a novel reinforcing material and matched with polymer mortar for structural reinforcement or defect repair, and the carbon fiber material has a strong reliability and wide application range.
However, the reinforcement effect of the current carbon fiber grid reinforcement system is mainly limited by two conditions.
Firstly, the flexibility and bearing capacity of the carbon fiber grid are different:
at present, carbon fiber grids on the market are mainly prepared by dipping flexible carbon fiber grids formed by braiding into epoxy resin and heating and curing, but after the epoxy resin is dipped, the rigidity of the carbon fiber grids is rapidly enhanced, compared with the carbon fiber grids which are not dipped with the epoxy resin, the flexibility of the carbon fiber grids is obviously reduced, the carbon fiber grids are difficult to be completely attached to the surface of a reinforced member in application, a mortar layer with larger thickness is required to be smeared for leveling, and the stress transfer between the reinforced member and the carbon fiber grids is slow and low in efficiency, so that the reinforcing effect is obviously reduced. For the carbon fiber grid which is formed by braiding and is not impregnated with glue, the carbon fiber grid needs to be pressed into a mortar layer by a scraper when in application, so that on one hand: the flexible grid which is not impregnated is difficult to keep in a straight state when being scraped, so that a good constraint effect cannot be achieved on deflection deformation of the reinforced member after construction, the high-strength characteristic of the flexible grid cannot be exerted, and the reinforcing effect of the flexible grid is lost; on the other hand: the flexible carbon fiber grids which are not impregnated are easily affected by external force, fiber precursors are easily broken, the mechanical properties of the whole carbon fiber grids are reduced, and the reinforcing effect on the reinforced member is seriously affected.
Secondly, interface mismatch between the carbon fiber grid and the polymer mortar:
since the carbon fiber mesh is not impregnated or not, active reactive groups are not available on the surface of the carbon fiber mesh for chemical bonding, which is determined by the chemical inertness of the surface of the carbon fiber precursor and the non-reactivity of the epoxy resin after curing. Therefore, the interface bonding can be only limited by chemical modification such as increasing the surface friction force, but the interface bonding is promoted by a physical anchoring method such as sand blasting, surface printing and the like for increasing the surface friction force, so that the interface bonding is extremely easy to fail when a vehicle passes through the action of the like, the anchoring depth is extremely limited due to the fact that the thickness of a carbon fiber grid is extremely limited, and the carbon fiber tows are damaged or the straightening state of the tows in the carbon fiber tows is changed; the interface combination is promoted by chemical modification methods such as dendritic macromolecule access, silane coupling agent addition and the like, the effect is limited, because the carbon fiber grid is shaped when the bonding effect is formed, and the carbon fiber grid and the mortar layer are still separated interface phases, so that a sandwich structure of mortar-grid-mortar is formed, and the carbon fiber grid and the mortar layer are not integrated and stressed cooperatively.
In view of this, the present application has been made.
Disclosure of Invention
The application aims to provide a capsule type curing agent, a curing self-regulating fiber grid and a construction method thereof.
The application is realized in the following way:
in a first aspect, the present application provides a capsule-type curing agent, which is composed of an outer shell and an inner core, wherein the outer shell comprises the following components in percentage by mass: 2-3, wherein the inner core is a mercaptan curing agent, and the mass ratio of the inner core to the outer shell is 1:0.5-1;
in an alternative embodiment, the particle size of the encapsulated curing agent is 500-1000nm;
preferably, the acrylonitrile content in the polystyrene-acrylonitrile copolymer is more than or equal to 40%;
preferably, the mercaptan curing agent is GPM-800.
In a second aspect, the present application provides a method for preparing a capsule-type curing agent, comprising:
the mass ratio of the polyamide to the polystyrene-acrylonitrile copolymer is 1:2-3 dissolving in DMF to obtain a homogeneous shell solution;
the mass ratio of the mercaptan curing agent to the solid content in the shell solution is 1:0.5-1, and dispersing and drying by ultrasonic.
In an alternative embodiment, the drying is electrospray drying;
preferably, the electrospray dried syringe is provided with a 21-23 gauge needle;
preferably, the voltage applied during the electrospray drying is 20-30kV, and the flow rate is 0.3-0.5ml/h;
preferably, a collector is arranged below the needle during electrospray drying, and the distance between the needle and the collector is 10-20cm.
In an alternative embodiment, the polyamide and the polystyrene-acrylonitrile copolymer are dissolved in the DMF at a rotational speed of 600-800r/min for 24-48 hours;
preferably, the mass percentage of the shell solution is 4-8wt%;
preferably, the polyamide and the polystyrene-acrylonitrile copolymer are further dried to remove moisture before being dissolved in the DMF;
preferably, the drying comprises drying in a vacuum oven at 50-80 ℃ for 12-24 hours.
In a third aspect, the present application provides a cured self-regulating fibrous web comprising a dry fibrous web reinforcement and a matrix comprising a resin solution and a capsule-type curative as in any of the preceding embodiments, the ratio of the epoxy equivalent of the resin solution to the active hydrogen equivalent of the capsule-type curative being 1:1.2-1.5.
In an alternative embodiment, the matrix is used in an amount of 800-1000g/m based on the area of the dry fiber mesh reinforcement 2 。
In an alternative embodiment, the resin solution is a single or compound solution of epoxy resin, and is specifically selected according to the construction environment to be regulated and controlled:
a) If the ambient temperature is lower than 10 ℃, selecting single or compound solution of AFG-90 and AG-80 polyfunctional epoxy resin;
b) If the ambient temperature is between 10 and 20 ℃, a compound solution of AFG-90 and AG-80 polyfunctional epoxy resin and E51 and E44 conventional epoxy resin is selected;
c) If the ambient temperature is higher than 30 ℃, single or compound solutions of E-51 and E-44 epoxy resins are selected;
d) If the dynamic load of the reinforced component is more than 0.1HZ, selecting a single or compound solution of 669 and 690 glycidyl ether epoxy resin;
e) If the reinforced member has deflection deformation, F-51 phenolic epoxy resin solution is selected;
f) If the produced grid needs to be stored for a long time, E-73 ester epoxy resin is selected.
In a fourth aspect, the present application provides a method of constructing a cured self-regulating fiber mesh, comprising:
(1) Coating or spraying the mortar on a base surface to form a first layer of mortar;
(2) Paving the solidified self-regulating fiber mesh on the surface of the first mortar layer before the first mortar layer is initially set, and flattening the solidified self-regulating fiber mesh to enable the solidified self-regulating fiber mesh to be partially embedded into the first mortar layer;
(3) The next mortar layer is immediately smeared or sprayed without waiting for the first mortar layer to be initially set;
(4) When a plurality of layers of the solidified self-regulating fiber grids are required to be paved, the steps (2) and (3) are circulated;
(5) Curing.
In an alternative embodiment, each layer of the mortar has a laying thickness of 3-10mm, and each layer of the cured self-regulating fiber grid has a laying thickness of 2-5mm.
In an alternative embodiment, before the mortar is applied to the base surface, the method further comprises the steps of removing impurities on the surface of the base surface, roughening the base surface, and removing surface floating ash after the roughening.
The application has the following beneficial effects:
the capsule curing agent provided by the application has a shell-core structure, the shell of the capsule curing agent contains curing agent (polyamide) with lower activity, and the inner core of the capsule curing agent is curing agent (mercaptan curing agent) with higher activity, so that the capsule curing agent is not cured or is cured slowly when contacting with a resin solution, and under the condition of heating, the shell is consumed in a reaction way, the inner mercaptan curing agent can be reacted with the resin solution rapidly to cure, therefore, the capsule curing agent provided by the application can regulate the curing process of epoxy resin in a fiber grid, and the shell structure is consumed only when the hydration reaction releases heat, so that the capsule curing agent provided by the application has good stability in low-temperature storage; after the shell participates in the reaction, the internal high-activity curing agent reacts rapidly, and the epoxy resin is accelerated to be cured to be cooperated with the mortar in solidification.
The curing self-regulating fiber mesh provided by the application is prepared into the capsule type curing agent by the curing components, and the capsule type curing agent is uniformly dispersed in the fiber mesh reinforcement body after gum dipping when not being constructed, at the moment, the fiber mesh reinforcement body after gum dipping is a wet carbon fiber mesh because of being uncured, the flexibility is good, the laminating performance is strong, the construction is easier, and the stability is good when the fiber mesh reinforcement body is stored at a low temperature. When in construction, the polyamide in the shell of the capsule type curing agent reacts under the condition of heating (such as hydration heat of mortar), and the inner mercaptan type curing agent is released when the shell is consumed, and the mercaptan type curing agent has extremely high activity and can rapidly react with epoxy resin immersed in the grid, so that the curing can be completed within 5-10 minutes to reach the required strength, the degree of adhesion of the fiber grid to the surface of the reinforcing member is obviously improved, and the thickness of the mortar layer caused by base surface leveling can be correspondingly reduced. In the aspect of fiber grid preparation, as curing operation is not needed, the fiber grids can be rolled, packed and stored after being soaked in the resin solution carrying the capsule curing agent, so that the fiber grid preparation efficiency is remarkably improved, and the process discontinuity caused by curing is avoided. The curing self-regulating fiber mesh provided by the application can realize synchronous progress of the curing reaction of mortar and the curing reaction of epoxy resin in the fiber mesh through the capsule curing agent, and realizes high rigidity and high load capacity after construction, thereby ensuring excellent reinforcing effect.
According to the construction method for the solidified self-regulating type fiber grid, when the construction is carried out, two layers of mortar can be continuously constructed, construction efficiency is improved, meanwhile, the problem that the solidification degree and humidity of different mortar layers are different when the conventional mortar-carbon fiber grid reinforcing system is solidified due to the fact that the two layers of mortar are constructed at intervals is solved, solidification is not cooperated, shrinkage rates of two layers of mortar at the same time are further different, interface dislocation occurs, internal stress of the interface is generated, and the reinforcing effect of a reinforced member is negatively influenced. The construction method of the solidified self-regulating fiber mesh can realize the cooperative progress of the solidification reaction of mortar and the solidification reaction of epoxy resin, so that particles and fibers in the mortar are doped into a carbon fiber mesh structure, and the epoxy resin in the carbon fiber mesh permeates into the mortar to form a three-dimensional doped reinforcing system, and the stress cooperation is excellent.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a microstructure of a cured self-regulating fiber mesh provided by the application, wherein a is the fiber mesh after impregnation, and B is a capsule curing agent dispersed in the fiber mesh.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below. The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
The application provides a solidified self-regulating fiber mesh, which comprises a dry fiber mesh reinforcement and a matrix, wherein the matrix comprises a resin solution and a capsule-type curing agent, and the ratio of the epoxy equivalent of the resin solution to the active hydrogen equivalent of the capsule-type curing agent is 1:1.2 to 1.5, preferably, the matrix is used in an amount of 800 to 1000g/m based on the area of the dry fiber mesh reinforcement 2 。
Further, the application also provides a preparation method of the solidified self-regulating fiber mesh, which comprises the following steps:
s1, preparing a dry fiber grid reinforcement.
Referring to the prior art of my department, a weaving device is adopted to prepare a dry-state fiber grid reinforcement, and the preparation process can refer to a production process of a carbon fiber grid cloth and a weaving treatment part in production equipment of CN 112976602A.
S2, preparing a capsule type curing agent.
(1) Drying the polyamide and the polystyrene-acrylonitrile copolymer to remove water; the drying includes drying in a vacuum oven at 50-80 deg.C for 12-24h.
(2) The polyamide and polystyrene-acrylonitrile copolymer were dissolved in DMF to obtain a homogeneous shell solution.
Wherein, the polyamide and the polystyrene-acrylonitrile copolymer are mixed according to the mass ratio of 1:2-3, the acrylonitrile content in the polystyrene-acrylonitrile copolymer is more than or equal to 40 percent, and the polyamide and the polystyrene-acrylonitrile copolymer are dissolved in DMF (dimethyl formamide) at the rotating speed of 600-800r/min for 24-48 hours, so as to obtain the shell solution with the mass percent of 4-8wt%.
(3) A thiol curing agent is mixed with the shell solution.
The weight ratio of the thiol curing agent to the solid content of the shell solution is 1:0.5-1, and the mixture is stirred for 2-4h. The mercaptan curing agent in the application is GPM-800. According to the application, when the weight ratio of the mercaptan curing agent to the shell solution exceeds the above range, if the use amount of the shell solution is too large, the thickness of the shell in the prepared core-shell structure is too large, the thermal decomposition time is prolonged, and if the use amount of the shell solution is too small, the thickness of the shell in the prepared core-shell structure is too small, the thermal decomposition time is too short, and the paving construction is not easy to complete.
(4) Dispersing by ultrasonic wave and drying.
The resulting mixture was sonicated in an ultrasonic bath for 20-40 minutes and electrosprayed into a 1ml syringe with a 21-23 gauge needle. The voltage applied during the electrospray drying is 20-30kV, and the flow rate is 0.3-0.5ml/h; a collector is provided under the needle during electrospray drying, and the distance between the needle and the collector is 10-20cm to allow complete evaporation of the solvent during spraying.
The particle size of the prepared capsule curing agent is 500-1000nm.
S3, preparing a matrix.
The matrix comprises a resin solution and the capsule-type curing agent in the step S2, and the capsule-type curing agent is dispersed in the resin solution, wherein the ratio of the epoxy equivalent of the resin solution to the active hydrogen equivalent of the capsule-type curing agent is 1:1.2-1.5. In the application, the proportion of the epoxy equivalent to the active hydrogen equivalent is limited, and the amount of the active hydrogen equivalent is larger than the epoxy equivalent, so that the amount of the capsule-type curing agent can be excessive, and the capsule-type curing agent can react with the resin solution and the mortar at the same time during subsequent curing.
In the application, the resin solution is a single or compound solution of epoxy resin, and is specifically selected according to the construction environment to be regulated and controlled:
a) If the ambient temperature is lower than 10 ℃, selecting single or compound solution of AFG-90 and AG-80 polyfunctional epoxy resin;
b) If the ambient temperature is between 10 and 20 ℃, a compound solution of AFG-90 and AG-80 polyfunctional epoxy resin and E51 and E44 conventional epoxy resin is selected;
c) If the ambient temperature is higher than 30 ℃, single or compound solutions of E-51 and E-44 epoxy resins are selected;
d) If the dynamic load of the reinforced member is frequent, when the dynamic load exceeds 0.1HZ, the grid is required to have better flexibility to carry out stress slow release, and single or compound solution of 669 and 690 glycidyl ether epoxy resin is selected;
e) If the reinforced member has deflection deformation, the requirement on the grid rigidity is higher, and F-51 phenolic epoxy resin solution is selected;
f) If the produced grid needs to be stored for a long time, E-73 ester ring-group epoxy resin is selected, so that the problem of moisture absorption of the resin solution stored for a long time is avoided.
S4, soaking.
Immersing the dry fiber mesh in a matrix in an amount of 800-1000g/m based on the area of the dry fiber mesh reinforcement 2 The dipping speed is 1-5m/min, after the dipping is finished, the redundant matrix is extruded, and at least one of two sides of the dry fiber grid reinforcement after the dipping is paved with a separation film, and then the separation film is rolled.
As can be seen from fig. 1, the cured self-regulating fiber mesh provided by the application is a wet fiber mesh, a large number of slow-release capsule molecular structures (capsule curing agent B) are distributed among tows of the impregnated fiber mesh a, a capsule shell is polyamide and polystyrene-acrylonitrile copolymer, and a capsule inner core is a thiol curing agent. The solidified self-regulating fiber mesh provided by the application needs to be stored and transported in a refrigerating way, so that the capsule type curing agent is kept from being heated in the storage and transportation processes to react.
In addition, the application also provides a construction method of the solidified self-regulating fiber mesh, which comprises the following steps:
(1) And (3) basal surface treatment: firstly removing impurities on the surface of a base surface, and performing roughening treatment on the base surface, and removing floating ash on the surface after the roughening treatment.
(2) Preparing mortar: and (3) fully stirring and uniformly mixing water and cement according to the mass percentage of 15-20% and 80-85% to obtain the mortar.
(3) The mortar is smeared or sprayed on a base surface to form a first layer of mortar, and the paving thickness of the first layer of mortar is 3-10mm.
(4) Paving the solidified self-regulating fiber grids on the surface of the first mortar layer before the first mortar layer is initially set, and flattening the solidified self-regulating fiber grids to enable the solidified self-regulating fiber grids to be partially embedded into the first mortar layer; the paving thickness of the solidified self-regulating fiber mesh is 2-5mm.
(5) The next mortar layer is immediately smeared or sprayed without waiting for the initial setting of the first mortar layer.
(6) When a plurality of layers of solidified self-regulating fiber grids are required to be paved, the steps (4) and (5) are circulated;
(7) Curing.
The curing self-regulating fiber mesh contacts with mortar, heat is released in the mortar curing process, so that a first-stage curing crosslinking reaction is carried out on a capsule shell and epoxy resin in the curing self-regulating fiber mesh, the capsule shell is consumed, an internal curing agent is released, a second-stage curing crosslinking reaction, namely the reaction of a mercaptan curing agent and the epoxy resin, is activated, the epoxy resin can be rapidly cured at normal temperature and even low temperature due to extremely high activity, the curing is completed within 5-10 minutes and the required strength is achieved, the mercaptan curing agent can also react with the mortar, at the moment, the curing self-regulating fiber mesh is immersed in the mortar for curing, mortar particles and chopped fibers are embedded in a curing network of the fiber mesh as fillers during curing, and an integrated mortar-mesh three-dimensional doping structure is formed, so that the whole reinforcing system is stressed cooperatively, and good construction convenience and reinforcing reliability are ensured. Therefore, the construction of two layers of mortar can be simultaneously carried out, and the interlayer stripping of the mortar caused by interface failure is avoided.
In the existing fiber grid reinforcing technology, the adopted fiber grids are cured fiber grids, a grid layer is paved, the first mortar layer is cured, then the next mortar layer can be smeared, and the construction period is long.
The features and capabilities of the present application are described in further detail below in connection with the examples.
Example 1
The embodiment provides a solidified self-regulating fiber mesh, and the preparation method comprises the following steps:
s1, preparing a dry fiber grid reinforcement.
S2, preparing a capsule type curing agent.
The polyamide and polystyrene-acrylonitrile copolymer (acrylonitrile content=40%) were dried in a vacuum oven at 80 ℃ for 12 hours to remove water according to a mass ratio of 1:2. The shell solution was dissolved in DMF by magnetic stirring (800 r/min) for 24h to give a mass percent of 4 wt%. Then, a thiol curing agent was added to the shell solution (core/shell weight ratio 1:1), and mixed by magnetic stirring for 2 hours. The resulting mixture was sonicated in an ultrasonic bath for 40 minutes and electrosprayed into a 1ml syringe with a 21 gauge needle. The voltage applied during the electrospray drying is 24kV, and the flow rate is 0.3ml/h; a collector was placed under the needle during electrospray drying, with a distance between the needle and the collector of 15cm, to allow complete evaporation of the solvent during spraying. The particle size of the prepared capsule curing agent is 500nm.
S3, preparing a matrix.
And uniformly mixing AFG-90 and AG-80 epoxy resin according to the mass ratio of 1:1 to prepare the compound resin solution. According to the active hydrogen equivalent and the epoxy equivalent of the compound resin solution and the capsule curing agent of 1:1.2, adding a capsule-type curing agent into the compound resin solution to prepare a mixed solution serving as a matrix.
S4, soaking.
Immersing the dry fiber mesh in a matrix in an amount of 800-1000g/m based on the area of the dry fiber mesh reinforcement 2 The dipping speed is 2m/min, after the dipping is finished, the redundant matrix is extruded, and at least one of two sides of the dry fiber grid reinforcement after gum dipping is paved with a separation film, and then the isolation film is rolled to obtain the solidified self-regulating fiber grid.
Examples 2 to 6
Examples 2-6 are essentially identical to example 1, except that the resin solution differs:
in example 2, AFG-90, AG-80, E51 and E44 were mixed in a mass ratio of 1:1:1:1, uniformly mixing the components in proportion to prepare a compound resin solution;
in example 3, E51 and E44 were prepared according to 1:1, uniformly mixing the components in proportion to prepare a compound resin solution;
in example 4, E51, E44, 669 were as follows: 1: mixing uniformly in a proportion of 0.2 to prepare a compound resin solution;
in example 5, F51 novolac epoxy resin was used as the resin solution;
in example 6, an E-73 ester ring-based epoxy resin was used as the resin solution.
Examples 7 to 8
Examples 7 to 8 are substantially the same as example 1, except that the preparation method of the capsule type curing agent is different:
in example 7, a mass ratio of polyamide to polystyrene-acrylonitrile copolymer (acrylonitrile content=40%) was 1:3, and the mixture was dried in a vacuum oven at 50 ℃ for 24 hours to remove moisture. The shell solution was dissolved in DMF by magnetic stirring (600 r/min) for 48h to give a mass percent of 8 wt%. Next, a thiol curing agent was added to the shell solution (core/shell weight ratio 1:0.5) and mixed by magnetic stirring for 4 hours. The resulting mixture was sonicated in an ultrasonic bath for 20 minutes and electrosprayed into a 1ml syringe with a 23 gauge needle. The voltage applied during the electrospray drying is 20kV, and the flow rate is 0.5ml/h; a collector was placed under the needle during electrospray drying, with a distance between the needle and the collector of 20cm, to allow complete evaporation of the solvent during spraying. The particle size of the prepared capsule curing agent is 900nm.
In example 8, a mass ratio of polyamide to polystyrene-acrylonitrile copolymer (acrylonitrile content=40%) was 1:2.5, and the mixture was dried in a vacuum oven at 80℃for 36 hours to remove moisture. The mixture was dissolved in DMF by magnetic stirring (700 r/min) for 36h to obtain a 6wt% shell solution. Next, a thiol curing agent was added to the shell solution (core/shell weight ratio 1:0.8) and mixed by magnetic stirring for 3 hours. The resulting mixture was sonicated in an ultrasonic bath for 30 minutes and electrosprayed into a 1ml syringe with a 21 gauge needle. The voltage applied during the electrospray drying is 30kV, and the flow rate is 0.4ml/h; a collector was placed under the needle during electrospray drying, with a distance between the needle and the collector of 10cm, to allow complete evaporation of the solvent during spraying. The particle size of the prepared capsule curing agent is 700nm.
Example 9
Example 9 is substantially the same as example 1 except that in this example, the ratio of the epoxy equivalent of the resin solution to the active hydrogen equivalent of the capsule-type curing agent is 1:1.5.
example 10
The embodiment provides a construction method of a solidified self-regulating fiber grid, which comprises the following steps:
(1) And (3) basal surface treatment: firstly removing impurities on the surface of a base surface, and performing roughening treatment on the base surface, and removing floating ash on the surface after the roughening treatment.
(2) Preparing mortar: and (3) fully stirring and uniformly mixing water and cement according to the mass percentage of 20% to 80%, so as to obtain the mortar.
(3) The mortar is smeared on a base surface to form a first layer of mortar, and the paving thickness of the first layer of mortar is 5mm.
(4) Paving the cured self-regulating fiber grid prepared in the embodiment 1 on the surface of the first mortar before the first mortar is initially set, and flattening the cured self-regulating fiber grid to enable the cured self-regulating fiber grid to be partially embedded into the first mortar; the laying thickness of the solidified self-regulating fiber mesh is 2mm.
(5) The next mortar layer is immediately smeared or sprayed without waiting for the initial setting of the first mortar layer; the paving thickness of the next mortar layer is 10mm.
(6) Curing.
The present embodiment only shows a construction manner of laying a layer of cured self-regulating fiber mesh, and it should be understood that steps (4) and (5) may be circulated when a plurality of layers of cured self-regulating fiber mesh are required to be laid. And (5) performing conventional maintenance after the paving is finished.
Comparative example 1
This comparative example is substantially the same as example 1 except that step S2 in this comparative example is different from example 1: in this comparative example, a polyamide, a polystyrene-acrylonitrile copolymer (acrylonitrile content=40%), a thiol curing agent, and a mass ratio of 2:4:5, uniformly mixing to prepare the compound non-capsule curing agent.
Comparative example 2
This comparative example is substantially the same as example 2 except that step S2 in this comparative example is different from example 2: in this comparative example, a polyamide, a polystyrene-acrylonitrile copolymer (acrylonitrile content=40%), a thiol curing agent, and a mass ratio of 2:4:5, uniformly mixing to prepare the compound non-capsule curing agent.
Comparative example 3
This comparative example is substantially the same as example 3 except that step S2 in this comparative example is different from example 3: in this comparative example, a polyamide, a polystyrene-acrylonitrile copolymer (acrylonitrile content=40%), a thiol curing agent, and a mass ratio of 2:4:5, uniformly mixing to prepare the compound non-capsule curing agent.
Comparative example 4
This comparative example is substantially the same as example 4 except that step S2 in this comparative example is different from example 4: in this comparative example, a polyamide, a polystyrene-acrylonitrile copolymer (acrylonitrile content=40%), a thiol curing agent, and a mass ratio of 2:4:5, uniformly mixing to prepare the compound non-capsule curing agent.
Comparative example 5
This comparative example is substantially the same as example 5 except that step S2 in this comparative example is different from example 5: in this comparative example, a polyamide, a polystyrene-acrylonitrile copolymer (acrylonitrile content=40%), a thiol curing agent, and a mass ratio of 2:4:5, uniformly mixing to prepare the compound non-capsule curing agent.
Comparative example 6
This comparative example is substantially the same as example 6 except that step S2 in this comparative example is different from example 6: in this comparative example, a polyamide, a polystyrene-acrylonitrile copolymer (acrylonitrile content=40%), a thiol curing agent, and a mass ratio of 2:4:5, uniformly mixing to prepare the compound non-capsule curing agent.
Comparative example 7
This comparative example is substantially the same as example 1 except that the preparation method of the capsule type curing agent is different, and in this comparative example, the mass ratio of polyamide to polystyrene-acrylonitrile copolymer (acrylonitrile content=40%) is modified to 1:5.
Comparative example 8
This comparative example is substantially the same as example 1 except that the preparation method of the capsule type curing agent is different, and in this comparative example, the mass ratio of polyamide to polystyrene-acrylonitrile copolymer (acrylonitrile content=40%) is modified to 2:1.
Comparative example 9
This comparative example is substantially the same as example 1 except that the preparation method of the capsule type curing agent is different, and in this comparative example, polyamide in the outer shell is omitted.
Comparative example 10
This comparative example is substantially the same as example 1 except that the preparation method of the capsule type curing agent is different, and in this comparative example, the core/shell weight ratio is modified to 1:0.2.
comparative example 11
This comparative example is substantially the same as example 1 except that the preparation method of the capsule type curing agent is different, and in this comparative example, the core/shell weight ratio is modified to 1:2.
comparative example 12
This comparative example was substantially the same as example 1 except that the preparation method of the capsule type curing agent was different, and in this comparative example, the stirring speed at the time of preparing the shell solution was adjusted to 1000r/min.
Comparative example 13
This comparative example was substantially the same as example 1 except that the preparation method of the capsule type curing agent was different, and in this comparative example, the stirring speed at the time of preparing the shell solution was adjusted to 400r/min.
Comparative example 14
This comparative example is substantially the same as example 1 except that the preparation method of the capsule type curing agent is different, and in this comparative example, the flow rate of electrospray is adjusted to 1ml/h.
Comparative example 15
This comparative example is substantially the same as example 1, except that the ratio of the epoxy equivalent of the resin solution to the active hydrogen equivalent of the capsule-type curing agent is 1:1.
experimental example one: tensile strength test.
The fiber grids prepared in the above examples and comparative examples were put into an oven and cured by heating at 40 ℃, and then a tensile strength test specimen was prepared according to GB/T1447-2005 method for testing tensile properties of fiber reinforced plastics, and tensile strength test was performed, and the test results are shown in Table 1.
Experimental example two: and (5) testing the forward pulling bonding strength.
Constructing the fiber grids prepared in the examples and the comparative examples according to the construction method provided in the example 10, using the fiber grids in combination with mortar, and adhering the fiber grids to the bottom of a concrete beam to prepare two groups of experimental beams;
curing the first group of experimental beams for 28 days at room temperature, and testing the forward-pulling bonding strength according to a forward-pulling bonding strength on-site measurement method and an evaluation standard of a bonding reinforcing material and a base material of an annex U bonding material of GB 50550 (inspection and acceptance Specification for construction quality of building structure reinforcing engineering);
and (3) mounting a vibrator on the second group of experimental beams, applying 5-8HZ vibration, and performing a forward-pulling bonding strength test according to a forward-pulling bonding strength field measurement method and an evaluation standard of a bonding reinforcing material and a base material of an annex U bonding material of GB 50550 'inspection and acceptance Specification of construction quality of building structure reinforcing engineering', wherein the detection result is shown in Table 1 after 28 days.
TABLE 1 statistical tables of tensile Strength and Forward bond Strength test results for various examples
From the above table, it can be seen that, by preparing the capsule-type curing agent, embodiments 1 to 6 can realize the regulation and control of the curing reaction process of the epoxy resin, the epoxy resin and the capsule-type curing agent do not react before construction, react slowly during construction, react quickly after construction, and realize high rigidity and high load capacity after construction on the basis of ensuring high flexibility of the fiber grid and facilitating construction, thereby ensuring excellent reinforcing effect.
According to the embodiment 7-8, the parameters in the preparation method of the capsule type curing agent are changed, so that the curing self-regulating type fiber grid with better tensile strength and excellent forward-pulling bonding strength under non-dynamic load or dynamic load can be obtained.
In example 9 of the present application, the epoxy equivalent of the resin solution and the active hydrogen equivalent of the capsule-type curing agent were changed, and when the amount of the capsule-type curing agent was more, the tensile strength of the fiber mesh was slightly affected, but the forward tensile bond strength after construction was hardly affected.
In the present application, comparative examples 1 to 6 correspond to examples 1 to 6, and only the components of the curing agent are mixed, and at this time, the capsule type curing agent, which cures during the mixing with the resin solution and dipping, cannot be formed, and therefore, the tensile strength of comparative examples 1 to 6 is slightly greater than that of examples 1 to 6 corresponding thereto, but the forward tensile bond strength under either the action load or the action load is significantly lower than that of examples 1 to 6 due to the advanced curing.
The comparative examples 7-9 of the present application changed the amount of polyamide and polystyrene-acrylonitrile copolymer, and it can be seen that when the amount of polyamide is too small, the core curing agent is released too early, reacts in advance, and interface bonding with mortar is affected to some extent; when the polyamide is used in an excessive amount, the release of the core curing agent is too slow, the core curing agent is consumed after the core curing agent is not penetrated into the mortar, and the interface combination with the mortar is affected; and omitting polyamide can lead to incapability of releasing the core curing agent, incapability of curing the carbon fiber grid, and serious influence on tensile strength, and positive tensile bonding strength under non-dynamic load or dynamic load.
The comparative examples 10-11 of the present application changed the core/shell weight ratio, and it can be seen that the probability of formation of the capsule type curing agent became smaller due to the unreasonable core-shell ratio, and the tensile strength was not changed much, but the forward tensile bond strength under either the dynamic load or the dynamic load was decreased.
According to the application, the stirring speed is changed in comparative examples 12-13, and it can be seen that the probability of formation of the capsule curing agent is reduced due to unreasonable rotation speed, and the tensile strength is not changed greatly, but the forward pulling bonding strength under non-dynamic load or dynamic load is reduced.
The comparative example 14 of the present application changed the flow rate of electrospray, and it can be seen that the probability of formation of the capsule type curing agent becomes small due to unreasonable flow rate, and the tensile strength is not changed much, but the forward tensile bonding strength under non-dynamic load or dynamic load is reduced.
In the application, the epoxy equivalent of the resin solution and the active hydrogen equivalent of the capsule-type curing agent are changed in comparative example 15, at this time, the tensile strength is slightly increased due to the fact that the curing agent is just consumed by the resin solution impregnated by the carbon fiber grid, but the chemical bonding effect of the carbon fiber grid and the mortar interface is affected, and the forward pulling bonding strength under the action of non-dynamic load or dynamic load is obviously reduced.
In summary, the capsule-type curing agent provided by the application has a shell-core structure, the shell of the capsule-type curing agent comprises a curing agent (polyamide) with lower activity, and the inner core of the capsule-type curing agent is a curing agent (mercaptan-type curing agent) with higher activity, so that the capsule-type curing agent is not cured or is cured slowly when contacting with a resin solution, and under the condition of heating, the shell is consumed in a reaction way, and the inner mercaptan-type curing agent can be reacted and cured with the resin solution quickly, therefore, the capsule-type curing agent provided by the application can regulate the curing process of epoxy resin in a fiber grid, and the shell structure needs to be consumed when the hydration reaction releases heat, so that the capsule-type curing agent provided by the application has good stability when stored at low temperature; after the shell participates in the reaction, the internal high-activity curing agent reacts rapidly, and the epoxy resin is accelerated to be cured to be cooperated with the mortar in solidification.
The curing self-regulating fiber mesh provided by the application is prepared into the capsule type curing agent by the curing components, and the capsule type curing agent is uniformly dispersed in the fiber mesh reinforcement body after gum dipping when not being constructed, at the moment, the fiber mesh reinforcement body after gum dipping is a wet carbon fiber mesh because of being uncured, the flexibility is good, the laminating performance is strong, the construction is easier, and the stability is good when the fiber mesh reinforcement body is stored at a low temperature. When in construction, the polyamide in the shell of the capsule type curing agent reacts under the condition of heating (such as hydration heat of mortar), and the inner mercaptan type curing agent is released when the shell is consumed, and the mercaptan type curing agent has extremely high activity and can rapidly react with epoxy resin immersed in the grid, so that the curing can be completed within 5-10 minutes to reach the required strength, the degree of adhesion of the fiber grid to the surface of the reinforcing member is obviously improved, and the thickness of the mortar layer caused by base surface leveling can be correspondingly reduced. In the aspect of fiber grid preparation, as curing operation is not needed, the fiber grids can be rolled, packed and stored after being soaked in the resin solution carrying the capsule curing agent, so that the fiber grid preparation efficiency is remarkably improved, and the process discontinuity caused by curing is avoided. The curing self-regulating fiber mesh provided by the application can realize synchronous progress of the curing reaction of mortar and the curing reaction of epoxy resin in the fiber mesh through the capsule curing agent, and realizes high rigidity and high load capacity after construction, thereby ensuring excellent reinforcing effect.
According to the construction method for the solidified self-regulating type fiber grid, when the construction is carried out, two layers of mortar can be continuously constructed, construction efficiency is improved, meanwhile, the problem that the solidification degree and humidity of different mortar layers are different when the conventional mortar-carbon fiber grid reinforcing system is solidified due to the fact that the two layers of mortar are constructed at intervals is solved, solidification is not cooperated, shrinkage rates of two layers of mortar at the same time are further different, interface dislocation occurs, internal stress of the interface is generated, and the reinforcing effect of a reinforced member is negatively influenced. The construction method of the solidified self-regulating fiber mesh can realize the cooperative progress of the solidification reaction of mortar and the solidification reaction of epoxy resin, so that particles and fibers in the mortar are doped into a carbon fiber mesh structure, and the epoxy resin in the carbon fiber mesh permeates into the mortar to form a three-dimensional doped reinforcing system, and the stress cooperation is excellent.
The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. The capsule curing agent is characterized by comprising a shell and an inner core, wherein the shell comprises the following components in percentage by mass: 2-3, wherein the inner core is a mercaptan curing agent, and the mass ratio of the inner core to the outer shell is 1:0.5-1.
2. The capsule type curing agent according to claim 1, wherein the particle size of the capsule type curing agent is 500 to 1000nm;
preferably, the acrylonitrile content in the polystyrene-acrylonitrile copolymer is more than or equal to 40%;
preferably, the mercaptan curing agent is GPM-800.
3. A method for preparing a capsule-type curing agent, which is characterized by comprising the following steps:
the mass ratio of the polyamide to the polystyrene-acrylonitrile copolymer is 1:2-3 dissolving in DMF to obtain a homogeneous shell solution;
the mass ratio of the mercaptan curing agent to the solid content in the shell solution is 1:0.5-1, and dispersing and drying by ultrasonic.
4. A method of preparing a capsule curing agent according to claim 3, wherein the drying is electrospray drying;
preferably, the electrospray dried syringe is provided with a 21-23 gauge needle;
preferably, the voltage applied during the electrospray drying is 20-30kV, and the flow rate is 0.3-0.5ml/h;
preferably, a collector is arranged below the needle during electrospray drying, and the distance between the needle and the collector is 10-20cm.
5. The method of preparing a capsule type curing agent according to claim 3, wherein the polyamide and the polystyrene-acrylonitrile copolymer are dissolved in the DMF at a rotation speed of 600-800r/min for 24-48 hours;
preferably, the mass percentage of the shell solution is 4-8wt%;
preferably, the polyamide and the polystyrene-acrylonitrile copolymer are further dried to remove moisture before being dissolved in the DMF;
preferably, the drying comprises drying in a vacuum oven at 50-80 ℃ for 12-24 hours.
6. A cured self-regulating fibrous web comprising a dry fibrous web reinforcement and a matrix comprising a resin solution and a capsule-type curative according to any one of claims 1-2, wherein the ratio of the epoxy equivalent of the resin solution to the active hydrogen equivalent of the capsule-type curative is 1:1.2-1.5.
7. The cured self-regulating fibrous web of claim 6, wherein the matrix is used in an amount of 800-1000g/m based on the area of the dry fibrous web reinforcement 2 。
8. The cured self-regulating fiber mesh according to claim 6, wherein the resin solution is a single or compound solution of epoxy resin, specifically selected according to the construction environment to be regulated:
a) If the ambient temperature is lower than 10 ℃, selecting single or compound solution of AFG-90 and AG-80 polyfunctional epoxy resin;
b) If the ambient temperature is between 10 and 20 ℃, a compound solution of AFG-90 and AG-80 polyfunctional epoxy resin and E51 and E44 conventional epoxy resin is selected;
c) If the ambient temperature is higher than 30 ℃, single or compound solutions of E-51 and E-44 epoxy resins are selected;
d) If the dynamic load of the reinforced component is more than 0.1HZ, selecting a single or compound solution of 669 and 690 glycidyl ether epoxy resin;
e) If the reinforced member has deflection deformation, F-51 phenolic epoxy resin solution is selected;
f) If the produced grid needs to be stored for a long time, E-73 ester epoxy resin is selected.
9. The construction method of the solidified self-regulating fiber mesh is characterized by comprising the following steps:
(1) Coating or spraying the mortar on a base surface to form a first layer of mortar;
(2) Paving the solidified self-regulating fiber mesh in any one of claims 6-8 on the surface of the first mortar before the first mortar is initially set, and flattening the solidified self-regulating fiber mesh to enable the solidified self-regulating fiber mesh to be partially embedded into the first mortar;
(3) The next mortar layer is immediately smeared or sprayed without waiting for the first mortar layer to be initially set;
(4) When a plurality of layers of the solidified self-regulating fiber grids are required to be paved, the steps (2) and (3) are circulated;
(5) Curing.
10. The method for constructing a cured self-regulating fiber grid according to claim 9, wherein the laying thickness of each layer of mortar is 3-10mm, and the laying thickness of each layer of cured self-regulating fiber grid is 2-5mm;
preferably, before the mortar is coated on the base surface, the method further comprises the steps of removing impurities on the surface of the base surface, roughening the base surface, and removing surface floating ash after the roughening.
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