CN117985985B - Composite material for high-strength cement pole and preparation method thereof - Google Patents
Composite material for high-strength cement pole and preparation method thereof Download PDFInfo
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- CN117985985B CN117985985B CN202410390753.1A CN202410390753A CN117985985B CN 117985985 B CN117985985 B CN 117985985B CN 202410390753 A CN202410390753 A CN 202410390753A CN 117985985 B CN117985985 B CN 117985985B
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- 239000002131 composite material Substances 0.000 title claims abstract description 125
- 239000004568 cement Substances 0.000 title claims abstract description 74
- 238000002360 preparation method Methods 0.000 title claims abstract description 7
- 239000003094 microcapsule Substances 0.000 claims abstract description 79
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 55
- 239000000835 fiber Substances 0.000 claims abstract description 45
- 239000003822 epoxy resin Substances 0.000 claims abstract description 22
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 22
- 229960000892 attapulgite Drugs 0.000 claims abstract description 18
- 229910052625 palygorskite Inorganic materials 0.000 claims abstract description 18
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 11
- 229910052751 metal Inorganic materials 0.000 claims abstract description 11
- 239000002184 metal Substances 0.000 claims abstract description 11
- 239000002994 raw material Substances 0.000 claims abstract description 7
- 238000003756 stirring Methods 0.000 claims description 82
- 238000002156 mixing Methods 0.000 claims description 50
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 47
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 47
- VYFYYTLLBUKUHU-UHFFFAOYSA-N dopamine Chemical compound NCCC1=CC=C(O)C(O)=C1 VYFYYTLLBUKUHU-UHFFFAOYSA-N 0.000 claims description 46
- 229920000742 Cotton Polymers 0.000 claims description 41
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 36
- 238000001035 drying Methods 0.000 claims description 36
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 33
- QKNYBSVHEMOAJP-UHFFFAOYSA-N 2-amino-2-(hydroxymethyl)propane-1,3-diol;hydron;chloride Chemical compound Cl.OCC(N)(CO)CO QKNYBSVHEMOAJP-UHFFFAOYSA-N 0.000 claims description 32
- 239000007853 buffer solution Substances 0.000 claims description 32
- 239000008367 deionised water Substances 0.000 claims description 32
- 229910021641 deionized water Inorganic materials 0.000 claims description 32
- 238000005406 washing Methods 0.000 claims description 31
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 30
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 25
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 24
- 150000001408 amides Chemical class 0.000 claims description 24
- 229960003638 dopamine Drugs 0.000 claims description 23
- QUSNBJAOOMFDIB-UHFFFAOYSA-N Ethylamine Chemical compound CCN QUSNBJAOOMFDIB-UHFFFAOYSA-N 0.000 claims description 22
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 22
- 238000001914 filtration Methods 0.000 claims description 21
- VHYFNPMBLIVWCW-UHFFFAOYSA-N 4-Dimethylaminopyridine Chemical compound CN(C)C1=CC=NC=C1 VHYFNPMBLIVWCW-UHFFFAOYSA-N 0.000 claims description 20
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 16
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 claims description 15
- 239000000661 sodium alginate Substances 0.000 claims description 15
- 235000010413 sodium alginate Nutrition 0.000 claims description 15
- 229940005550 sodium alginate Drugs 0.000 claims description 15
- UUEWCQRISZBELL-UHFFFAOYSA-N 3-trimethoxysilylpropane-1-thiol Chemical compound CO[Si](OC)(OC)CCCS UUEWCQRISZBELL-UHFFFAOYSA-N 0.000 claims description 14
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 12
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 12
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 claims description 12
- 229910052757 nitrogen Inorganic materials 0.000 claims description 12
- 239000000758 substrate Substances 0.000 claims description 12
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 claims description 11
- KFDVPJUYSDEJTH-UHFFFAOYSA-N 4-ethenylpyridine Chemical compound C=CC1=CC=NC=C1 KFDVPJUYSDEJTH-UHFFFAOYSA-N 0.000 claims description 11
- QOSSAOTZNIDXMA-UHFFFAOYSA-N Dicylcohexylcarbodiimide Chemical compound C1CCCCC1N=C=NC1CCCCC1 QOSSAOTZNIDXMA-UHFFFAOYSA-N 0.000 claims description 11
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 11
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 11
- 239000000805 composite resin Substances 0.000 claims description 11
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims description 11
- 239000011259 mixed solution Substances 0.000 claims description 11
- 235000010482 polyoxyethylene sorbitan monooleate Nutrition 0.000 claims description 11
- 229920000053 polysorbate 80 Polymers 0.000 claims description 11
- CTENFNNZBMHDDG-UHFFFAOYSA-N Dopamine hydrochloride Chemical compound Cl.NCCC1=CC=C(O)C(O)=C1 CTENFNNZBMHDDG-UHFFFAOYSA-N 0.000 claims description 10
- 229960001149 dopamine hydrochloride Drugs 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 4
- 239000012467 final product Substances 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 10
- 238000005336 cracking Methods 0.000 abstract description 7
- 230000000052 comparative effect Effects 0.000 description 32
- 238000006243 chemical reaction Methods 0.000 description 11
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 7
- 239000000178 monomer Substances 0.000 description 7
- 229920005646 polycarboxylate Polymers 0.000 description 6
- 239000003469 silicate cement Substances 0.000 description 6
- 239000002904 solvent Substances 0.000 description 6
- 229920001690 polydopamine Polymers 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 239000002775 capsule Substances 0.000 description 4
- PQPXZWUZIOASKS-UHFFFAOYSA-N dopaminoquinone Chemical compound NCCC1=CC(=O)C(=O)C=C1 PQPXZWUZIOASKS-UHFFFAOYSA-N 0.000 description 3
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- AZQWKYJCGOJGHM-UHFFFAOYSA-N 1,4-benzoquinone Chemical compound O=C1C=CC(=O)C=C1 AZQWKYJCGOJGHM-UHFFFAOYSA-N 0.000 description 2
- SGNZYJXNUURYCH-UHFFFAOYSA-N 5,6-dihydroxyindole Chemical compound C1=C(O)C(O)=CC2=C1NC=C2 SGNZYJXNUURYCH-UHFFFAOYSA-N 0.000 description 2
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical group C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 description 2
- 238000007792 addition Methods 0.000 description 2
- 125000003368 amide group Chemical group 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- YCIMNLLNPGFGHC-UHFFFAOYSA-N catechol Chemical group OC1=CC=CC=C1O YCIMNLLNPGFGHC-UHFFFAOYSA-N 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000003999 initiator Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 238000006845 Michael addition reaction Methods 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 125000003277 amino group Chemical group 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000002242 deionisation method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 125000003700 epoxy group Chemical group 0.000 description 1
- 125000004185 ester group Chemical group 0.000 description 1
- 238000010559 graft polymerization reaction Methods 0.000 description 1
- 238000003402 intramolecular cyclocondensation reaction Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007344 nucleophilic reaction Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 238000010526 radical polymerization reaction Methods 0.000 description 1
- 150000003254 radicals Chemical class 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000012783 reinforcing fiber Substances 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 125000003396 thiol group Chemical group [H]S* 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H12/00—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
- E04H12/02—Structures made of specified materials
- E04H12/12—Structures made of specified materials of concrete or other stone-like material, with or without internal or external reinforcements, e.g. with metal coverings, with permanent form elements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Materials Engineering (AREA)
- Ceramic Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to a composite material for a high-strength cement pole and a preparation method thereof, wherein the composite material for the high-strength cement pole comprises the following raw materials in parts by weight: 200-250 parts of cement, 100-130 parts of coarse aggregate, 45-55 parts of fine aggregate, 20-30 parts of metal rod, 70-90 parts of composite fiber, 30-40 parts of composite microcapsule, 5-10 parts of water reducer and 180-220 parts of water; the composite fiber is prepared by modifying the fiber in the composite material for the high-strength cement pole, has good toughness and good adhesion with a cement base material, so that the composite material for the high-strength cement pole has good cracking resistance and mechanical property, and the composite microcapsule is added, and takes epoxy resin and attapulgite as self-repairing materials, so that the composite material for the high-strength cement pole has certain self-repairing capability.
Description
Technical Field
The invention relates to the field of building materials, in particular to a composite material for a high-strength cement pole and a preparation method thereof.
Background
At present, a cement pole is adopted in low-voltage-level power grid construction, and is extremely difficult to carry out line construction and later-period operation maintenance on mountain areas with complex terrains and flourishing vegetation, and in the daily use process, the cracking of the cement pole is a common problem, once the cracking occurs on the cement pole, the cracking can be lengthened and widened gradually along with time, so that various problems such as exposed ribs of the cement pole, falling of cement, great reduction of the strength of the cement pole, reduction of bearing capacity and the like are caused, and further, the cement pole is broken due to incapability of bearing heavy load, so that a power failure accident occurs.
In order to solve the problem of cracking of the cement pole, various natural fibers and artificial fibers are usually added into the raw materials of the cement pole to improve the mechanical property of the cement pole or to endow the cement pole with certain self-repairing capability, so that the cement pole can be self-repaired after the crack occurs, and the polyvinyl alcohol is used as a common cement reinforcing fiber which can better improve the crack resistance and durability of the cement pole, but the bonding force between the polyvinyl alcohol and a cement matrix is not strong, the high-strength high-modulus advantage of the polyvinyl alcohol cannot be effectively exerted, the self-repairing microcapsule is added, the capsule core in the self-repairing microcapsule is usually epoxy resin, the hole of the concrete is increased due to the surface property of the microcapsule, so that the mechanical property of the cement pole is reduced, and meanwhile, the bonding force between the epoxy resin and the cement matrix is insufficient.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a composite material for a high-strength cement pole and a preparation method thereof.
The aim of the invention can be achieved by the following technical scheme: the composite material for the high-strength cement pole comprises the following raw materials in parts by weight: 200-250 parts of cement, 100-130 parts of coarse aggregate, 45-55 parts of fine aggregate, 20-30 parts of metal rod, 70-90 parts of composite fiber, 30-40 parts of composite microcapsule, 5-10 parts of water reducer and 180-220 parts of water;
a composite material for a high-strength cement pole is prepared by the following steps: mixing coarse aggregate, fine aggregate, metal rod, composite fiber and composite microcapsule, adding cement, stirring, adding water reducer and water, and stirring to obtain high-strength composite material for cement rod;
The composite microcapsule is prepared by the following steps:
Step A1: mixing sodium alginate and deionized water, stirring at a stirring rate of 3000-3500rpm at room temperature, adding attapulgite, epoxy resin and tween-80, stirring for 30-35min to obtain a mixed solution, slowly dripping the mixed solution into a calcium chloride solution, standing for 12h, filtering, washing, and drying to obtain a microcapsule, wherein the mass fraction of the calcium chloride solution is 2.5%, and the dosage ratio of the sodium alginate, deionized water, attapulgite, epoxy resin, tween-80 and calcium chloride solution is 8-10g:400mL:8-10g:50-60mL:2-3mL:300mL;
In the reaction process of the step A1, a microcapsule is prepared by an orifice-coagulation bath method, firstly wall material monomer sodium alginate is mixed with solvent deionized water, core attapulgite, epoxy resin and surfactant Tween-80 are added, the epoxy resin can be well mixed with water, then the mixed solution is slowly dripped into a calcium chloride solution by using a needle tube, because the monomer sodium alginate has the characteristic of unique transformation from sol to gel, when the sodium alginate encounters divalent metal ions such as Ca 2+, na + in the sodium alginate is replaced by Ca 2+ under the action of ion transformation, so that the wall material of the prepared microcapsule is solidified by standing and placing, and then the microcapsule is prepared by filtering, washing and drying;
Step A2: mixing Tris-HCl buffer solution and composite resin microcapsule, stirring and adding dopamine hydrochloride under the condition of stirring speed of 150-200rpm and room temperature, reacting for 20-24h, filtering, washing and drying to obtain the dopamine coated microcapsule, wherein the molar concentration of the Tris-HCl buffer solution is 0.1mol/L, pH and the dosage ratio of the Tris-HCl buffer solution, the composite resin microcapsule and the dopamine hydrochloride is 800-900mL:4-5g:10-12g;
In the reaction process of the step A2, tris-HCl buffer solution is used for maintaining an alkaline environment of the reaction, catechol groups of dopamine are firstly oxidized into dopamine quinone with a o-phthalquinone structure, the reaction moves towards the direction of generating the dopamine quinone structure due to reversible balance between phenol and quinone in the reaction, then the dopamine quinone structure is subjected to intramolecular cyclization due to nucleophilic reaction and oxidation rearrangement to generate 5, 6-dihydroxyindole, then the 5, 6-dihydroxyindole is subjected to intermolecular or intramolecular crosslinking reaction to generate dopamine oligomer, and the dopamine oligomer is polymerized into polydopamine to wrap the microcapsule due to non-covalent effect among molecules, and the polydopamine is adsorbed on the microcapsule due to the catechol structure in the polydopamine to prepare the dopamine wrapping microcapsule;
Step A3: mixing the dopamine modified microcapsule and Tris-HCl buffer solution, adding 3-mercaptopropyl trimethoxysilane under the conditions of stirring speed of 50-60rpm and room temperature, reacting for 2-3h, filtering, washing and drying to obtain the composite microcapsule, wherein the molar concentration of the Tris-HCl buffer solution is 0.1mol/L, pH and the dosage ratio of the dopamine modified microcapsule, the Tris-HCl buffer solution and the 3-mercaptopropyl trimethoxysilane is 5-6g:600-700mL:8-10g;
in the reaction process of the step A3, tris-HCl buffer solution is used for maintaining the weak alkalinity of the environment, the poly dopamine in the poly dopamine layer in the dopamine-coated microcapsule and the sulfhydryl in the monomer 3-mercaptopropyl trimethoxy silane undergo Michael addition reaction, and the 3-mercaptopropyl trimethoxy silane is grafted on the surface to prepare the composite microcapsule;
The composite fiber is prepared by the following steps:
Step B1: mixing vinyl acetate, maleic anhydride, 4-vinylpyridine and absolute ethyl alcohol, stirring and adding azodiisobutyronitrile under the condition of nitrogen protection, stirring at the speed of 60-80rpm and the temperature of 65-70 ℃, reacting for 12-14h, drying to obtain a substrate, mixing the substrate, methanol and sodium hydroxide, reacting for 1-2h under the condition of stirring at the speed of 60-80rpm and the temperature of 40 ℃, washing, and drying to obtain modified polyvinyl alcohol, wherein the dosage ratio of the vinyl acetate, the maleic anhydride, the 4-vinylpyridine, the absolute ethyl alcohol, the azodiisobutyronitrile, the methanol and the sodium hydroxide is 1.8-2mol:0.4-0.5mol:0.2-0.3mol:180-200mL:5mL:350-400mL:15-20g;
In the reaction process of the step B1, under the action of an initiator azodiisobutyronitrile, the double bonds of monomer vinyl acetate, monomer maleic anhydride and monomer 4-vinyl pyridine are subjected to free radical polymerization in absolute ethyl alcohol solvent, then methanol solvent, sodium hydroxide and a substrate are mixed, and the sodium hydroxide adjusts the system to be alkaline, so that side chain ester groups in a vinyl acetate chain segment of the substrate are hydrolyzed, and modified polyvinyl alcohol containing hydroxyl, carboxyl and pyridine groups is prepared;
Step B2: mixing modified polyvinyl alcohol, dicyclohexylcarbodiimide, 4-dimethylaminopyridine and N, N-dimethylformamide, stirring at a stirring speed of 60-70rpm and a temperature of 25-30 ℃ under the protection of nitrogen, adding ethylamine, reacting for 20-24h, washing and drying to obtain amide modified polyvinyl alcohol, wherein the dosage ratio of the modified polyvinyl alcohol to the dicyclohexylcarbodiimide to the 4-dimethylaminopyridine to the N, N-dimethylformamide to the ethylamine is 50-60g:10-12g:10-12g:300-350mL:0.3 to 0.4mol;
in the reaction process of the step B2, mixing modified polyvinyl alcohol with a solvent N, N-dimethylformamide, and reacting carboxyl in the modified polyvinyl alcohol with amino in ethylamine under the action of a condensing agent dicyclohexylcarbodiimide to generate an amide group to prepare amide modified polyvinyl alcohol;
step B3: mixing cotton fiber, deionized water and ammonium persulfate, stirring and adding acrylic acid under the conditions of nitrogen protection and stirring speed of 60-70rpm and temperature of 60 ℃, reacting for 3-4 hours, washing and drying to obtain modified cotton fiber, wherein the dosage ratio of the cotton fiber to the deionized water to the ammonium persulfate to the acrylic acid is 8-10g:200-220mL:2g:0.4-0.5mol;
In the reaction process of the step B3, mixing cotton fibers, monomer acrylic acid and solvent deionized water, and carrying out free radical graft polymerization on hydroxyl groups in cellulose in the cotton fibers and double bonds in the acrylic acid under the action of an ammonium persulfate initiator to obtain modified cotton fibers containing carboxyl;
Step B4: mixing the modified cotton fiber with deionized water, stirring and adding amide modified polyvinyl alcohol and glycerol at the stirring speed of 300-400rpm and the temperature of 70 ℃, reacting for 6-8h, and filtering to obtain the composite fiber, wherein the dosage ratio of the modified cotton fiber to the deionized water to the amide modified polyvinyl alcohol to the glycerol is 5-6g:120-150mL:5g:1-1.2g;
In the reaction process of the step B4, the modified cotton fiber and the amide modified polyvinyl alcohol are mixed in a solvent for deionization, so that the modified cotton fiber and the modified polyvinyl alcohol are entangled and mixed with each other to prepare the composite fiber;
The invention has the beneficial effects that: the invention discloses a composite material for a high-strength cement pole and a preparation method thereof, wherein fibers in the composite material for the high-strength cement pole are modified, and composite microcapsules are added, so that the composite material for the high-strength cement pole has better cracking resistance and mechanical property, and has certain self-repairing capability; epoxy resin and attapulgite are used as a capsule core, sodium alginate is used as a capsule wall, dopamine is used for wrapping, and finally 3-mercaptopropyl trimethoxy silane is grafted, when microcracks appear in the composite material, the capsule wall is broken through crack tip stress, epoxy resin and attapulgite are mixed and flow out, epoxy groups in the epoxy resin can react with amino groups in a dopamine wrapping layer or amide groups or carboxyl groups in the composite fiber for curing, so that microcracks are repaired, meanwhile, due to the special structure of the attapulgite, the epoxy resin is effectively combined with a cement matrix after the epoxy resin is mixed with the epoxy resin, so that the composite material can still maintain good mechanical properties after self-repairing, and by grafting 3-mercaptopropyl trimethoxy silane, silane can react with a cement base material to form a stable gel structure in the cement hydration process, so that the reduction of the mechanical properties of the composite material caused by the addition of the composite microcapsule is reduced; the amide modified polyvinyl alcohol and the modified cotton fiber are mixed, and the amide modified polyvinyl alcohol contains hydroxyl, amide and pyridine groups, so that lignin structure and carboxyl groups exist in the modified cotton fiber, after the amide modified polyvinyl alcohol and the amide modified cotton fiber are mixed, physical entanglement exists, the amide modified polyvinyl alcohol and the modified cotton fiber are connected through hydrogen bonds, the composite fiber has stronger toughness due to chemical connection, and the high polarity of carboxyl groups in the modified cotton fiber enables the cement particles to be tightly adsorbed on the surface of the composite fiber, so that the adhesive force between the composite fiber and a cement base material is improved, and the defect of a cement hydration network can be well compensated for the composite fiber due to the long-chain structure of the modified cotton fiber and the amide modified polyvinyl alcohol, so that the composite material for the high-strength cement pole has good crack resistance and mechanical property.
Detailed Description
The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
The composite microcapsule is prepared by the following steps:
Step A1: mixing sodium alginate and deionized water, stirring at a stirring speed of 3000rpm at room temperature, adding 400-mesh attapulgite, weng Jiang-mesh epoxy resin and tween-80 to obtain a mixed solution, slowly dripping the mixed solution into a calcium chloride solution, standing for 12h, filtering, washing and drying to obtain a microcapsule, wherein the mass fraction of the calcium chloride solution is 2.5%, and the dosage ratio of the sodium alginate, the deionized water, the attapulgite, the epoxy resin, the tween-80 and the calcium chloride solution is 8g:400mL:8g:50mL:2mL:300mL;
Step A2: mixing Tris-HCl buffer solution and composite resin microcapsule, stirring and adding dopamine hydrochloride under the condition of stirring speed of 150rpm and room temperature, reacting for 24 hours, filtering, washing and drying to obtain the dopamine-coated microcapsule, wherein the molar concentration of the Tris-HCl buffer solution is 0.1mol/L, pH and the dosage ratio of the Tris-HCl buffer solution, the composite resin microcapsule and the dopamine hydrochloride is 800mL:45g:12g;
Step A3: mixing the dopamine modified microcapsule and Tris-HCl buffer solution, adding 3-mercaptopropyl trimethoxysilane at the stirring speed of 50rpm and at room temperature, reacting for 3 hours, filtering, washing and drying to obtain the composite microcapsule, wherein the molar concentration of the Tris-HCl buffer solution is 0.1mol/L, pH, the dosage ratio of the dopamine modified microcapsule to the Tris-HCl buffer solution to the 3-mercaptopropyl trimethoxysilane is 5g:600mL:8g.
Example 2
The composite microcapsule is prepared by the following steps:
Step A1: mixing sodium alginate and deionized water, stirring at 3500rpm at room temperature, adding 400-mesh attapulgite of commercial power, weng Jiang-reagent E-51 epoxy resin and tween-80, stirring for 30min to obtain a mixed solution, slowly dripping the mixed solution into a calcium chloride solution, standing for 12h, filtering, washing, and drying to obtain a microcapsule, wherein the mass fraction of the calcium chloride solution is 2.5%, and the dosage ratio of the sodium alginate, deionized water, attapulgite, epoxy resin, tween-80 and calcium chloride solution is 10g:400mL:8g:50mL:2mL:300mL;
Step A2: mixing Tris-HCl buffer solution and composite resin microcapsule, stirring and adding dopamine hydrochloride under the condition of stirring speed of 200rpm and room temperature, reacting for 20 hours, filtering, washing and drying to obtain the dopamine-coated microcapsule, wherein the molar concentration of the Tris-HCl buffer solution is 0.1mol/L, pH and the dosage ratio of the Tris-HCl buffer solution, the composite resin microcapsule and the dopamine hydrochloride is 900mL:4g:12g;
Step A3: mixing the dopamine modified microcapsule and Tris-HCl buffer solution, adding 3-mercaptopropyl trimethoxysilane at the stirring speed of 60rpm and at room temperature, reacting for 2 hours, filtering, washing and drying to obtain the composite microcapsule, wherein the molar concentration of the Tris-HCl buffer solution is 0.1mol/L, pH, the dosage ratio of the dopamine modified microcapsule, the Tris-HCl buffer solution and the 3-mercaptopropyl trimethoxysilane is 5g:700mL:10g.
Example 3
The composite microcapsule is prepared by the following steps:
Step A1: mixing sodium alginate and deionized water, stirring at 3500rpm at room temperature, adding 400-mesh attapulgite of commercial power, weng Jiang-reagent E-51 epoxy resin and tween-80, stirring for 35min to obtain a mixed solution, slowly dripping the mixed solution into a calcium chloride solution, standing for 12h, filtering, washing, and drying to obtain a microcapsule, wherein the mass fraction of the calcium chloride solution is 2.5%, and the dosage ratio of the sodium alginate, deionized water, attapulgite, epoxy resin, tween-80 and calcium chloride solution is 10g:400mL:10g:60mL:3mL:300mL;
Step A2: mixing Tris-HCl buffer solution and composite resin microcapsule, stirring and adding dopamine hydrochloride under the condition of stirring speed of 200rpm and room temperature, reacting for 24 hours, filtering, washing and drying to obtain the dopamine coated microcapsule, wherein the molar concentration of the Tris-HCl buffer solution is 0.1mol/L, pH and the dosage ratio of the Tris-HCl buffer solution, the composite resin microcapsule and the dopamine hydrochloride is 900mL:5g:12g;
Step A3: mixing the dopamine modified microcapsule and Tris-HCl buffer solution, adding 3-mercaptopropyl trimethoxysilane at the stirring speed of 60rpm and at room temperature, reacting for 3 hours, filtering, washing and drying to obtain the composite microcapsule, wherein the molar concentration of the Tris-HCl buffer solution is 0.1mol/L, pH and the dosage ratio of the dopamine modified microcapsule, the Tris-HCl buffer solution and the 3-mercaptopropyl trimethoxysilane is 6g:700mL:10g.
Example 4
The composite fiber is prepared by the following steps:
Step B1: mixing vinyl acetate, maleic anhydride, 4-vinylpyridine and absolute ethyl alcohol, stirring and adding azodiisobutyronitrile under the condition of nitrogen protection, stirring at the speed of 60rpm and the temperature of 70 ℃, reacting for 12 hours, drying to obtain a substrate, mixing the substrate, methanol and sodium hydroxide, reacting for 2 hours under the condition of stirring at the speed of 60rpm and the temperature of 40 ℃, washing, and drying to obtain modified polyvinyl alcohol, wherein the dosage ratio of the vinyl acetate, the maleic anhydride, the 4-vinylpyridine, the absolute ethyl alcohol, the azodiisobutyronitrile, the methanol and the sodium hydroxide is 1.8mol:0.4mol:0.2mol:180mL:5mL:350mL:15g;
Step B2: mixing modified polyvinyl alcohol, dicyclohexylcarbodiimide, 4-dimethylaminopyridine and N, N-dimethylformamide, stirring at a stirring speed of 60rpm and a temperature of 25 ℃, adding ethylamine, reacting for 22 hours, washing, and drying to obtain amide modified polyvinyl alcohol, wherein the dosage ratio of the modified polyvinyl alcohol, dicyclohexylcarbodiimide, 4-dimethylaminopyridine, N-dimethylformamide to the ethylamine is 50g:10g:10g:300mL:0.3mol;
Step B3: mixing commercially available cotton fiber with the flow of 10mm, deionized water and ammonium persulfate, stirring and adding acrylic acid under the conditions of nitrogen protection, stirring speed of 60rpm and temperature of 60 ℃, reacting for 4 hours, washing and drying to obtain modified cotton fiber, wherein the dosage ratio of the cotton fiber to the deionized water to the ammonium persulfate to the acrylic acid is 8g:200mL:2g:0.4mol;
Step B4: mixing the modified cotton fiber with deionized water, stirring at a stirring rate of 300rpm and a temperature of 70 ℃, adding amide modified polyvinyl alcohol and glycerol, reacting for 8 hours, and filtering to obtain a composite fiber, wherein the dosage ratio of the modified cotton fiber, the deionized water and the amide modified polyvinyl alcohol to the glycerol is 5g:120mL:5g:1g.
Example 5
The composite fiber is prepared by the following steps:
Step B1: mixing vinyl acetate, maleic anhydride, 4-vinylpyridine and absolute ethyl alcohol, stirring and adding azodiisobutyronitrile under the condition of nitrogen protection, stirring at the speed of 80rpm and the temperature of 65 ℃, reacting for 12 hours, drying to obtain a substrate, mixing the substrate, methanol and sodium hydroxide, reacting for 1 hour under the condition of stirring at the speed of 80rpm and the temperature of 40 ℃, washing, and drying to obtain modified polyvinyl alcohol, wherein the dosage ratio of the vinyl acetate, the maleic anhydride, the 4-vinylpyridine, the absolute ethyl alcohol, the azodiisobutyronitrile, the methanol and the sodium hydroxide is 1.8mol:0.45mol:0.3mol:180mL:5mL:350mL:15g;
Step B2: mixing modified polyvinyl alcohol, dicyclohexylcarbodiimide, 4-dimethylaminopyridine and N, N-dimethylformamide, stirring at a stirring speed of 60rpm and a temperature of 30 ℃, adding ethylamine, reacting for 24 hours, washing and drying to obtain amide modified polyvinyl alcohol, wherein the dosage ratio of the modified polyvinyl alcohol, dicyclohexylcarbodiimide, 4-dimethylaminopyridine, N-dimethylformamide and ethylamine is 60g:10g:12g:350mL:0.3mol;
Step B3: mixing commercially available cotton fiber with the flow of 10mm, deionized water and ammonium persulfate, stirring and adding acrylic acid under the conditions of nitrogen protection, stirring speed of 70rpm and temperature of 60 ℃, reacting for 3 hours, washing and drying to obtain modified cotton fiber, wherein the dosage ratio of the cotton fiber to the deionized water to the ammonium persulfate to the acrylic acid is 8g:220mL:2g:0.4mol;
Step B4: mixing the modified cotton fiber with deionized water, stirring at a stirring rate of 300rpm and a temperature of 70 ℃, adding amide modified polyvinyl alcohol and glycerol, reacting for 8 hours, and filtering to obtain a composite fiber, wherein the dosage ratio of the modified cotton fiber to the deionized water to the amide modified polyvinyl alcohol to the glycerol is 6g:120-150mL:5g:1g.
Example 6
The composite fiber is prepared by the following steps:
Step B1: mixing vinyl acetate, maleic anhydride, 4-vinylpyridine and absolute ethyl alcohol, stirring and adding azodiisobutyronitrile under the condition of nitrogen protection, stirring at the speed of 80rpm and the temperature of 70 ℃, reacting for 14 hours, drying to obtain a substrate, mixing the substrate, methanol and sodium hydroxide, reacting for 2 hours under the condition of stirring at the speed of 80rpm and the temperature of 40 ℃, washing, and drying to obtain modified polyvinyl alcohol, wherein the dosage ratio of the vinyl acetate, the maleic anhydride, the 4-vinylpyridine, the absolute ethyl alcohol, the azodiisobutyronitrile, the methanol and the sodium hydroxide is 2mol:0.5mol:0.3mol:200mL:5mL:400mL:20g;
Step B2: mixing modified polyvinyl alcohol, dicyclohexylcarbodiimide, 4-dimethylaminopyridine and N, N-dimethylformamide, stirring at a stirring speed of 70rpm and a temperature of 30 ℃, adding ethylamine, reacting for 20h, washing and drying to obtain amide modified polyvinyl alcohol, wherein the dosage ratio of the modified polyvinyl alcohol, dicyclohexylcarbodiimide, 4-dimethylaminopyridine, N-dimethylformamide and ethylamine is 60g:12g:12g:350mL:0.4mol;
Step B3: mixing commercially available cotton fiber with the flow of 10mm, deionized water and ammonium persulfate, stirring and adding acrylic acid under the conditions of nitrogen protection, stirring speed of 70rpm and temperature of 60 ℃, reacting for 4 hours, washing and drying to obtain modified cotton fiber, wherein the dosage ratio of the cotton fiber to the deionized water to the ammonium persulfate to the acrylic acid is 10g:220mL:2g:0.5mol;
Step B4: mixing the modified cotton fiber with deionized water, stirring at a stirring rate of 400rpm and a temperature of 70 ℃, adding amide modified polyvinyl alcohol and glycerol, reacting for 8 hours, and filtering to obtain a composite fiber, wherein the dosage ratio of the modified cotton fiber to the deionized water to the amide modified polyvinyl alcohol to the glycerol is 6g:150mL:5g:1.2g.
Example 7
The composite material for the high-strength cement pole comprises the following raw materials in parts by weight: 200 parts of commercial persevered high PO 42.5 silicate cement, 100 parts of commercial road map coarse aggregate, 45-55 parts of commercial road map fine aggregate, 20 parts of commercial Yutaimen 10mm metal rod, 70 parts of example 6 composite fiber, 30 parts of example 3 composite microcapsule, 5 parts of commercial Runxing QSC-polycarboxylate water reducer and 180 parts of water;
A composite material for a high-strength cement pole is prepared by the following steps: mixing the commercial road map coarse aggregate, the commercial road map fine aggregate, the commercial Yutaimen 10mm metal rod, the example 6 composite fiber and the example 3 composite microcapsule, then adding the commercial high PO 42.5 silicate cement, further stirring, then continuously adding the commercial Runxing QSC-polycarboxylate water reducer and water, and stirring and mixing to obtain the composite material for the high-strength cement rod.
Example 8
The composite material for the high-strength cement pole comprises the following raw materials in parts by weight: 250 parts of commercial persevered PO 42.5 silicate cement, 130 parts of commercial road map coarse aggregate, 55 parts of commercial road map fine aggregate, 20 parts of commercial Yutaimen 10mm metal rod, 70 parts of example 6 composite fiber, 35 parts of example 3 composite microcapsule, 8 parts of commercial Runxing QSC-polycarboxylate water reducer and 200 parts of water;
A composite material for a high-strength cement pole is prepared by the following steps: mixing the commercial road map coarse aggregate, the commercial road map fine aggregate, the commercial Yutaimen 10mm metal rod, the example 6 composite fiber and the example 3 composite microcapsule, then adding the commercial high PO 42.5 silicate cement, further stirring, then continuously adding the commercial Runxing QSC-polycarboxylate water reducer and water, and stirring and mixing to obtain the composite material for the high-strength cement rod.
Example 9
The composite material for the high-strength cement pole comprises the following raw materials in parts by weight: 250 parts of commercial persevered PO 42.5 silicate cement, 130 parts of commercial road map coarse aggregate, 55 parts of commercial road map fine aggregate, 30 parts of commercial Yutaimen 10mm metal rod, 90 parts of example 6 composite fiber, 40 parts of example 3 composite microcapsule, 10 parts of commercial Runxing QSC-polycarboxylate water reducer and 220 parts of water;
A composite material for a high-strength cement pole is prepared by the following steps: mixing the commercial road map coarse aggregate, the commercial road map fine aggregate, the commercial Yutaimen 10mm metal rod, the example 6 composite fiber and the example 3 composite microcapsule, then adding the commercial high PO 42.5 silicate cement, further stirring, then continuously adding the commercial Runxing QSC-polycarboxylate water reducer and water, and stirring and mixing to obtain the composite material for the high-strength cement rod.
Comparative example 1
Comparative example 1 in which the composite microcapsules of example 9 were replaced with dopamine-modified microcapsules of step A2 of example 3, the other steps were identical to those of example 9, a composite material for high-strength cement poles was prepared.
Comparative example 2
Comparative example 2 in which the composite microcapsule of example 9 was replaced with the composite microcapsule of comparative example 2, and the other steps were identical to those of example 9, a composite material for high-strength cement poles was produced;
The composite microcapsule of the comparative example 2 is prepared by removing the attapulgite in the step A1 of the example 3, and the other steps are identical to those of the example 3.
Comparative example 3
Comparative example 3 in which the composite fiber of example 9 was replaced with the composite fiber of comparative example 3, and the other steps were identical to those of example 9, a composite material for high-strength cement poles was produced;
in the composite fiber of comparative example 3, the amide-modified polyvinyl alcohol in the step B4 of example 6 was replaced with commercially available polyvinyl alcohol with a mass of 9mm, and the other steps were identical to those of example 6, to obtain the composite fiber of comparative example 3.
Comparative example 4
Comparative example 4 in which the composite fiber of example 9 was replaced with the composite fiber of comparative example 4, and the other steps were identical to those of example 9, a composite material for high-strength cement poles was produced;
In the composite fiber of comparative example 4, the modified cotton fiber in the step B4 of example 6 was replaced with a commercially available cotton fiber having a diameter of 10mm, and the other steps were identical to those of example 6, to obtain the composite fiber of comparative example 4.
The high-strength cement pole composite materials prepared in example 7, example 8, example 9, comparative example 1, comparative example 2 and comparative example 3 were taken, added into a mold containing a reinforcing mesh, cured for 16 hours at a temperature of 85 ℃ and a humidity of 50%, a sample was prepared, the specification of which was D-phi 300 x 12 x 60 x Y GB4623, and the compressive strength, flexural strength and crack resistance coefficient thereof were measured by a simple test method with reference to GB/T4623-2014, the bending moment was examined by applying a load-bearing force thereto for 3 minutes, removing the load, curing for 28 days at room temperature, and the compressive strength and flexural strength thereof were measured, and the test results were shown in the following table:
| Detecting items | Example 7 | Example 8 | Example 9 | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 |
| Compressive strength (MPa) | 191 | 197 | 204 | 174 | 199 | 162 | 170 |
| Flexural strength (MPa) | 52 | 53 | 59 | 47 | 58 | 40 | 42 |
| Coefficient of cracking | 1.8 | 1.8 | 1.9 | 1.7 | 1.9 | 1.6 | 1.6 |
| Compressive Strength after self-repair (MPa) | 128 | 132 | 138 | 113 | 91 | 108 | 102 |
| Flexural strength after self-repairing (MPa) | 48 | 48 | 56 | 42 | 43.5 | 36 | 34 |
As can be seen from the test results of the table, comparing the test results of example 7, example 8 and example 9 with the test results of comparative example 1, comparative example 2 and comparative example 3, the mechanical properties of the composite microcapsule in comparative example 1 are obviously reduced after the composite microcapsule is replaced by the dopamine modified microcapsule in step A2 of example 3, which means that the composite microcapsule effectively improves the adhesion force between the composite microcapsule and a cement base material, the mechanical properties of the composite material for high-strength cement poles are ensured, and the composite microcapsule in comparative example 2 is replaced by the composite microcapsule without attapulgite, the adhesion force between the epoxy resin and the cement base material after self-repairing cannot meet the requirement due to the lack of attapulgite, and further the compression strength of the composite microcapsule after self-repairing is obviously reduced; in comparative example 3, the composite fiber is replaced by the composite fiber of comparative example 3, the mechanical property of the composite fiber of comparative example 3 is reduced due to the lack of hydrogen bond connection between the polyvinyl alcohol and the modified cotton fiber, and then the mechanical property of the composite material for the high-strength cement pole is reduced, and after the composite fiber is replaced by the composite fiber of comparative example 4, the self-repairing capability of the composite material for the high-strength cement pole is obviously reduced due to the lack of carboxyl groups of the cotton fiber compared with the modified cotton fiber, which indicates that the composite fiber and the composite microcapsule coexist, and the self-repairing capability of the composite material for the high-strength cement pole can be effectively improved.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is merely illustrative and explanatory of the principles of the invention, as various modifications and additions may be made to the specific embodiments described, or similar thereto, by those skilled in the art, without departing from the principles of the invention or beyond the scope of the appended claims.
Claims (9)
1. A composite material for a high-strength cement pole is characterized in that: comprises the following raw materials in parts by weight: 200-250 parts of cement, 100-130 parts of coarse aggregate, 45-55 parts of fine aggregate, 20-30 parts of metal rod, 70-90 parts of composite fiber, 30-40 parts of composite microcapsule, 5-10 parts of water reducer and 180-220 parts of water;
The composite microcapsule is prepared by the following steps:
Step A1: mixing sodium alginate and deionized water, stirring at a stirring rate of 3000-3500rpm at room temperature, adding attapulgite, epoxy resin and tween-80, stirring for 30-35min to obtain a mixed solution, slowly dripping the mixed solution into calcium chloride solution, standing for 12h, filtering, washing, and drying to obtain composite resin microcapsule;
Step A2: mixing Tris-HCl buffer solution and composite resin microcapsule, stirring and adding dopamine hydrochloride under the condition of stirring speed of 150-200rpm and room temperature, reacting for 20-24h, filtering, washing and drying to obtain dopamine modified microcapsule;
step A3: mixing the dopamine modified microcapsule with Tris-HCl buffer solution, adding 3-mercaptopropyl trimethoxy silane under the conditions of stirring speed of 50-60rpm and room temperature, reacting for 2-3h, filtering, washing and drying to obtain a composite microcapsule;
The composite fiber is prepared by the following steps:
Step B1: mixing vinyl acetate, maleic anhydride, 4-vinylpyridine and absolute ethyl alcohol, stirring and adding azodiisobutyronitrile under the condition of nitrogen protection, stirring at the speed of 60-80rpm and the temperature of 65-70 ℃, reacting for 12-14h, drying to obtain a substrate, mixing the substrate, methanol and sodium hydroxide, reacting for 1-2h under the condition of stirring at the speed of 60-80rpm and the temperature of 40 ℃, washing, and drying to obtain modified polyvinyl alcohol;
step B2: mixing modified polyvinyl alcohol, dicyclohexylcarbodiimide, 4-dimethylaminopyridine and N, N-dimethylformamide, stirring at a stirring speed of 60-70rpm and a temperature of 25-30 ℃ under the protection of nitrogen, adding ethylamine, reacting for 20-24h, washing and drying to obtain amide modified polyvinyl alcohol;
Step B3: mixing cotton fiber, deionized water and ammonium persulfate, stirring and adding acrylic acid under the conditions of nitrogen protection, stirring speed of 60-70rpm and temperature of 60 ℃, reacting for 3-4 hours, washing and drying to obtain modified cotton fiber;
Step B4: mixing the modified cotton fiber with deionized water, stirring at a stirring speed of 300-400rpm and a temperature of 70 ℃, adding amide modified polyvinyl alcohol and glycerol, reacting for 6-8h, and filtering to obtain the composite fiber.
2. A composite material for high strength cement poles according to claim 1, wherein: in the step A1, the mass fraction of the calcium chloride solution is 2.5%, and the dosage ratio of the sodium alginate, deionized water, attapulgite, epoxy resin, tween-80 and the calcium chloride solution is 8-10g:400mL:8-10g:50-60mL:2-3mL:300mL.
3. A composite material for high strength cement poles according to claim 1, wherein: in the step A2, the molar concentration of the Tris-HCl buffer solution is 0.1mol/L, pH value is 8.5, and the dosage ratio of the Tris-HCl buffer solution, the composite resin microcapsule and the dopamine hydrochloride is 800-900mL:4-5g:10-12g.
4. A composite material for high strength cement poles according to claim 1, wherein: in the step A3, the molar concentration of the Tris-HCl buffer solution is 0.1mol/L, pH value is 8.5, and the dosage ratio of the dopamine modified microcapsule, the Tris-HCl buffer solution and the 3-mercaptopropyl trimethoxy silane is 5-6g:600-700mL:8-10g.
5. A composite material for high strength cement poles according to claim 1, wherein: in the step B1, the dosage ratio of vinyl acetate, maleic anhydride, 4-vinylpyridine, absolute ethyl alcohol, azodiisobutyronitrile, methanol and sodium hydroxide is 1.8-2mol:0.4-0.5mol:0.2-0.3mol:180-200mL:5mL:350-400mL:15-20g.
6. A composite material for high strength cement poles according to claim 1, wherein: in the step B2, the dosage ratio of the modified polyvinyl alcohol, dicyclohexylcarbodiimide, 4-dimethylaminopyridine, N-dimethylformamide and ethylamine is 50-60g:10-12g:10-12g:300-350mL:0.3 to 0.4mol.
7. A composite material for high strength cement poles according to claim 1, wherein: in the step B3, the dosage ratio of the cotton fiber, deionized water, ammonium persulfate and acrylic acid is 8-10g:200-220mL:2g:0.4-0.5mol.
8. A composite material for high strength cement poles according to claim 1, wherein: in the step B4, the dosage ratio of the modified cotton fiber, the deionized water, the amide modified polyvinyl alcohol and the glycerol is 5-6g:120-150mL:5g:1-1.2g.
9. A method for preparing the composite material for the high-strength cement pole according to claim 1, which is characterized in that: the preparation method comprises the following steps: mixing coarse aggregate, fine aggregate, metal rod, composite fiber and composite microcapsule, adding cement, stirring, adding water reducer and water, and stirring to obtain the final product.
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| CN110294609A (en) * | 2019-06-21 | 2019-10-01 | 游雪花 | A kind of preparation method of concrete creak self-repair material |
| CN111362637A (en) * | 2020-03-15 | 2020-07-03 | 重庆金石源电力线路器材有限公司 | Cement-based telegraph pole |
| CN114716178A (en) * | 2022-03-18 | 2022-07-08 | 天津大学 | Environment-friendly cement self-repairing system, preparation method and application |
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