CN116639923A - Color-changing concrete and preparation method thereof - Google Patents
Color-changing concrete and preparation method thereof Download PDFInfo
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- CN116639923A CN116639923A CN202310735457.6A CN202310735457A CN116639923A CN 116639923 A CN116639923 A CN 116639923A CN 202310735457 A CN202310735457 A CN 202310735457A CN 116639923 A CN116639923 A CN 116639923A
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- color
- changing
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- microcapsule
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- 239000004567 concrete Substances 0.000 title claims abstract description 202
- 238000002360 preparation method Methods 0.000 title claims abstract description 39
- 239000003094 microcapsule Substances 0.000 claims abstract description 80
- 239000000463 material Substances 0.000 claims abstract description 66
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 45
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 24
- 239000004020 conductor Substances 0.000 claims abstract description 22
- 239000004568 cement Substances 0.000 claims abstract description 12
- 239000013530 defoamer Substances 0.000 claims abstract description 9
- 239000002994 raw material Substances 0.000 claims abstract description 6
- 238000003756 stirring Methods 0.000 claims description 41
- 239000011162 core material Substances 0.000 claims description 34
- 238000002156 mixing Methods 0.000 claims description 21
- 239000002904 solvent Substances 0.000 claims description 19
- 239000004417 polycarbonate Substances 0.000 claims description 18
- 229920000515 polycarbonate Polymers 0.000 claims description 18
- 239000002270 dispersing agent Substances 0.000 claims description 16
- 238000010438 heat treatment Methods 0.000 claims description 16
- 239000002245 particle Substances 0.000 claims description 16
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 15
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- 239000000725 suspension Substances 0.000 claims description 15
- 239000000843 powder Substances 0.000 claims description 14
- CYMPUOGZUXAIMY-UHFFFAOYSA-N 4-methoxy-2-methyl-n-phenylaniline Chemical group CC1=CC(OC)=CC=C1NC1=CC=CC=C1 CYMPUOGZUXAIMY-UHFFFAOYSA-N 0.000 claims description 13
- 239000002518 antifoaming agent Substances 0.000 claims description 13
- 230000001105 regulatory effect Effects 0.000 claims description 13
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 12
- -1 bromoindoline spirobenzopyran Chemical compound 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 12
- 239000002002 slurry Substances 0.000 claims description 12
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 10
- 239000012752 auxiliary agent Substances 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 10
- VFPFQHQNJCMNBZ-UHFFFAOYSA-N ethyl gallate Chemical compound CCOC(=O)C1=CC(O)=C(O)C(O)=C1 VFPFQHQNJCMNBZ-UHFFFAOYSA-N 0.000 claims description 10
- 239000006097 ultraviolet radiation absorber Substances 0.000 claims description 10
- 239000003795 chemical substances by application Substances 0.000 claims description 9
- 229940124543 ultraviolet light absorber Drugs 0.000 claims description 9
- JNDMLEXHDPKVFC-UHFFFAOYSA-N aluminum;oxygen(2-);yttrium(3+) Chemical compound [O-2].[O-2].[O-2].[Al+3].[Y+3] JNDMLEXHDPKVFC-UHFFFAOYSA-N 0.000 claims description 8
- QUAMTGJKVDWJEQ-UHFFFAOYSA-N octabenzone Chemical compound OC1=CC(OCCCCCCCC)=CC=C1C(=O)C1=CC=CC=C1 QUAMTGJKVDWJEQ-UHFFFAOYSA-N 0.000 claims description 8
- 229910019901 yttrium aluminum garnet Inorganic materials 0.000 claims description 8
- BOTNYLSAWDQNEX-UHFFFAOYSA-N phenoxymethylbenzene Chemical group C=1C=CC=CC=1COC1=CC=CC=C1 BOTNYLSAWDQNEX-UHFFFAOYSA-N 0.000 claims description 6
- RPWFJAMTCNSJKK-UHFFFAOYSA-N Dodecyl gallate Chemical compound CCCCCCCCCCCCOC(=O)C1=CC(O)=C(O)C(O)=C1 RPWFJAMTCNSJKK-UHFFFAOYSA-N 0.000 claims description 5
- 239000004262 Ethyl gallate Substances 0.000 claims description 5
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 claims description 5
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- 239000000395 magnesium oxide Substances 0.000 claims description 5
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 5
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 5
- 238000000967 suction filtration Methods 0.000 claims description 5
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- 238000005406 washing Methods 0.000 claims description 5
- 239000011787 zinc oxide Substances 0.000 claims description 5
- 229920000877 Melamine resin Polymers 0.000 claims description 4
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 claims description 4
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 4
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 4
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 4
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims description 4
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims description 4
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims description 4
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims description 4
- 229920000570 polyether Polymers 0.000 claims description 4
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 4
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 claims description 4
- NLZUEZXRPGMBCV-UHFFFAOYSA-N Butylhydroxytoluene Chemical group CC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 NLZUEZXRPGMBCV-UHFFFAOYSA-N 0.000 claims description 3
- 125000001931 aliphatic group Chemical group 0.000 claims description 3
- 235000010354 butylated hydroxytoluene Nutrition 0.000 claims description 3
- 229920005646 polycarboxylate Polymers 0.000 claims description 3
- 238000012805 post-processing Methods 0.000 claims description 2
- 230000008859 change Effects 0.000 abstract description 29
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- 238000012546 transfer Methods 0.000 description 7
- 238000001228 spectrum Methods 0.000 description 6
- 150000001875 compounds Chemical class 0.000 description 5
- BXWNKGSJHAJOGX-UHFFFAOYSA-N hexadecan-1-ol Chemical compound CCCCCCCCCCCCCCCCO BXWNKGSJHAJOGX-UHFFFAOYSA-N 0.000 description 5
- 230000007704 transition Effects 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 4
- 230000002776 aggregation Effects 0.000 description 4
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 4
- 238000013329 compounding Methods 0.000 description 4
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- 239000002250 absorbent Substances 0.000 description 3
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- 230000015572 biosynthetic process Effects 0.000 description 3
- FFBGYFUYJVKRNV-UHFFFAOYSA-N boranylidynephosphane Chemical compound P#B FFBGYFUYJVKRNV-UHFFFAOYSA-N 0.000 description 3
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- XJRPTMORGOIMMI-UHFFFAOYSA-N ethyl 2-amino-4-(trifluoromethyl)-1,3-thiazole-5-carboxylate Chemical compound CCOC(=O)C=1SC(N)=NC=1C(F)(F)F XJRPTMORGOIMMI-UHFFFAOYSA-N 0.000 description 3
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 3
- 230000003993 interaction Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 230000027756 respiratory electron transport chain Effects 0.000 description 3
- RNMDNPCBIKJCQP-UHFFFAOYSA-N 5-nonyl-7-oxabicyclo[4.1.0]hepta-1,3,5-trien-2-ol Chemical compound C(CCCCCCCC)C1=C2C(=C(C=C1)O)O2 RNMDNPCBIKJCQP-UHFFFAOYSA-N 0.000 description 2
- 108010010803 Gelatin Proteins 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
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- 238000005054 agglomeration Methods 0.000 description 2
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- 239000000084 colloidal system Substances 0.000 description 2
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- 239000008273 gelatin Substances 0.000 description 2
- 229920000159 gelatin Polymers 0.000 description 2
- 235000019322 gelatine Nutrition 0.000 description 2
- 235000011852 gelatine desserts Nutrition 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 238000009775 high-speed stirring Methods 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 238000004020 luminiscence type Methods 0.000 description 2
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- 238000002310 reflectometry Methods 0.000 description 2
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- 239000002253 acid Substances 0.000 description 1
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- 239000003513 alkali Substances 0.000 description 1
- 229960000541 cetyl alcohol Drugs 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
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- 239000006260 foam Substances 0.000 description 1
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- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
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- 239000007788 liquid Substances 0.000 description 1
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- 238000010907 mechanical stirring Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
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- 239000000178 monomer Substances 0.000 description 1
- DGVVJWXRCWCCOD-UHFFFAOYSA-N naphthalene;hydrate Chemical compound O.C1=CC=CC2=CC=CC=C21 DGVVJWXRCWCCOD-UHFFFAOYSA-N 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
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- AAAQKTZKLRYKHR-UHFFFAOYSA-N triphenylmethane Chemical compound C1=CC=CC=C1C(C=1C=CC=CC=1)C1=CC=CC=C1 AAAQKTZKLRYKHR-UHFFFAOYSA-N 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
-
- 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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/30—Oxides other than silica
-
- 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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/30—Oxides other than silica
- C04B14/303—Alumina
-
- 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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/30—Oxides other than silica
- C04B14/304—Magnesia
-
- 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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/36—Inorganic materials not provided for in groups C04B14/022 and C04B14/04 - C04B14/34
-
- 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
- C04B16/00—Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B16/04—Macromolecular compounds
-
- 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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
-
- 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
- C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
- C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
-
- 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)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Civil Engineering (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Manufacturing Of Micro-Capsules (AREA)
Abstract
The application belongs to the technical field of concrete materials, and particularly discloses color-changing concrete and a preparation method thereof. The application relates to color-changing concrete which is mainly prepared from the following concrete raw materials in parts by weight: 600-700 parts of cement, 1100-1300 parts of coarse aggregate, 400-500 parts of fine aggregate, 180-200 parts of water, 60-80 parts of modified color-changing microcapsules, 55-75 parts of heat conducting material, 20-30 parts of light conducting material, 12-28 parts of water reducer and 5-7 parts of defoamer. According to the application, the color-changing microcapsule with sensitive temperature-sensitive sensitivity and the heat-conducting material and the light-conducting material matched with the color-changing microcapsule are added into the concrete, so that the color-changing concrete can generate corresponding color change according to the temperature change in the environment more sensitively after being applied to the field of construction, and the energy-saving effect of the construction is realized.
Description
Technical Field
The application relates to the technical field of concrete materials, in particular to color-changing concrete and a preparation method thereof.
Background
With the development of national economy and the improvement of town ratio, the demands of people on indoor thermal environment quality are increasingly improved. With the popularization of air conditioning systems, building energy consumption is continuously rising. Meanwhile, a great deal of application of the air conditioner also has adverse effects on urban heat environment, and phenomena such as urban heat island effect and the like are caused.
In order to improve urban thermal environment, thermochromic materials are doped into concrete, so that the thermochromic building base material prepared from the thermochromic building base material has great application potential in the aspects of reducing cold and hot loads of buildings and improving urban thermal environment. According to the climate conditions of different areas, the concrete material has special optical properties that the self-reflectivity changes along with the change of temperature so as to present different colors and also has different reflection and absorption of solar radiation. The light color is presented in the high temperature in summer, the sunlight is reflected as much as possible, the heat transfer into the building is reduced, and the refrigeration requirement is reduced; dark color is shown in winter at low temperature, sunlight is absorbed as much as possible, heat loss on the surface of the building is reduced, and heat preservation effect is improved. The temperature of the surface of the building is regulated and controlled through the reflectivity which dynamically changes, meanwhile, the cold load and the heat load in the building are reduced, and intelligent interaction between the building and the environment is realized.
Aiming at the technology, the inventor considers that the color-changing concrete in the prior art has a plurality of problems of small color-changing range, insensitive color-changing reaction under the influence of temperature and the like. Therefore, it is necessary to develop a concrete material having a high color-changing sensitivity.
Disclosure of Invention
In order to improve the sensitivity of the functional concrete to temperature change and color change, the application provides a color-changing concrete and a preparation method thereof.
In a first aspect, the application provides a color-changing concrete, which adopts the following technical scheme:
the color-changing concrete comprises the following components in parts by weight: 600-700 parts of cement, 1100-1300 parts of coarse aggregate, 400-500 parts of fine aggregate, 180-200 parts of water, 60-80 parts of modified color-changing microcapsules, 55-75 parts of heat conducting material, 20-30 parts of light conducting material, 12-28 parts of water reducer and 5-7 parts of defoamer.
By adopting the technical scheme, the modified color-changing microcapsule is added into the concrete to realize the color change of the concrete along with the external environment temperature. The microcapsule is adopted, and the organic reversible thermochromic material and a small amount of organic reversible photochromic material are selected as main multi-component compound color-changing core materials, so that the color-changing core materials have the advantages of higher color-changing sensitivity to external temperature change (mainly caused by solar radiation), wide color-changing range, lower color-changing temperature, long service life, high color-changing definition and the like; the high polymer resin material is selected as a main wall material, and the color-changing core material can be packaged and stored in the transparent microcapsule by a microcapsule technology, so that the physical and chemical stability of the color-changing core material is ensured on the premise of not affecting the color-changing performance of the color-changing core material; the heat conduction material and the light conduction material are added into the concrete, and the modified color-changing microcapsule is further matched to generate thermochromism and photochromism, so that the color-changing sensitivity of the concrete product is further improved; water reducing agent and defoaming agent are added into concrete to improve the working performance of the concrete.
Preferably, the modified color-changing microcapsule comprises the following components in parts by weight: 10-18 parts of a color former, 14-24 parts of a color developer, 60-85 parts of a solvent, 8-10 parts of a dispersing agent, 6-8 parts of an ultraviolet light absorber, 200-320 parts of a wall material and 8-12 parts of an auxiliary agent;
wherein the color former is 4-methoxy-2-methyl diphenylamine and bromoindoline spirobenzopyran, and the mass ratio of the 4-methoxy-2-methyl diphenylamine to the bromoindoline spirobenzopyran is 1: (0.20-0.30);
the color developing agent is one or more of ethyl gallate and lauryl gallate;
the solvent is benzyl phenyl ether;
the dispersing agent is one or more of polyvinyl alcohol and hydroxypropyl methyl cellulose ether;
the ultraviolet light absorber is 2, 2-hydroxy-4-n-octoxybenzophenone;
the wall body material is melamine-formaldehyde resin;
the auxiliary agent is 2, 6-di-tert-butyl-p-cresol.
By adopting the technical scheme, the color former, the color developer and the solvent form the ternary organic color-changing composite material, wherein 4-methoxy-2-methyl diphenylamine and bromoindoline spirobenzopyran are selected as the multi-component compound color former. On the one hand, 4-methoxy-2-methyldiphenylamine is the main thermochromic material, which reacts with the developer at a lower temperature, while the solvent exists in a solid form, promoting the formation of the developer-developer complex. Along with the increase of the external temperature, electron transfer occurs between the color-changing core material system and the color-developing agent, so that the molecular structure of the 4-methoxy-2-methyl diphenylamine is rearranged, different molecular structures correspond to different spectrum absorption bands, and meanwhile, the solvent is melted to generate interaction, so that the color-changing core material system is converted from dark black into a colorless state, and the overall color-changing reaction of the concrete is realized macroscopically. On the other hand, the bromoindoline spirobenzopyran is taken as a spiropyran photochromic material, and can carry out light blue fading color change on a color development spectrum according to solar radiation received by the surface of the concrete and illumination transmitted to the inside through a light guide material, thereby enhancing the thermochromic effect exerted by 4-methoxy-2-methyl diphenylamine;
the ethyl gallate and the lauryl gallate are selected as the color developing agent, so that the color depth of the color developing agent on concrete macroscopic representation can be effectively regulated, the ethyl gallate and the lauryl gallate have good stability, and a certain inhibition effect on electron transfer reaction of the bromoindoline spirobenzopyran at a lower temperature can be achieved;
the benzyl phenyl ether is selected as a solvent, has a lower activation temperature, and generates a solid-liquid phase change phenomenon along with the temperature rise, and the benzyl phenyl ether of each phase can keep better compatibility with the wall material so as to ensure the stability of the modified color-changing microcapsule;
the polyvinyl alcohol and the hydroxypropyl methyl cellulose ether are selected as the dispersing agent, so that the phenomenon that aggregation is easy to occur in a polymer matrix due to smaller particle size of the color-changing core material particles can be regulated. The method can form a stable double electric layer and an adsorption layer on the surface of the color-changing core material particles, and can lead the color-changing core material particles to be difficult to be aggregated closely and to keep a stable dispersion state by generating electrostatic repulsive force and steric effect of the adsorption layer;
the melamine-formaldehyde resin is selected as a fully synthetic high polymer material to form the shell of the microcapsule, and the microcapsule has higher physical and chemical stability, film forming property and mechanical stretching elasticity, can protect the color-changing core material from being influenced by external factors such as acid, alkali and the like caused by other components in a concrete system, and can also avoid the damage of the microcapsule structure caused by strong shearing action in the processing process; 2, 2-hydroxy-4-n-octoxybenzophenone is selected as an ultraviolet light absorber to be added into the wall body material, so that the outer wall of the microcapsule can be endowed with a good light stabilization effect, and the compatibility of the 2, 2-hydroxy-4-n-octoxybenzophenone and the resin material is good;
2, 6-di-tert-butyl-p-cresol is selected to endow the outer wall of the microcapsule with good oxidation resistance, so that the service life of the modified color-changing microcapsule is prolonged.
Preferably, the preparation method of the modified color-changing microcapsule comprises the following steps:
s1, preparing a color-changing core material: mixing the color former, the color developer, the solvent and the dispersing agent, uniformly stirring at the speed of 200-400r/min, heating to 65-105 ℃ in a water bath, uniformly stirring at the constant temperature of 100-180r/min for 20-30min after the system is uniform, and cooling at room temperature to obtain the color-changing core material;
s2, preparing microcapsule suspension: heating the wall material and the color-changing core material in the step S1 to 55-65 ℃ for melt blending, reacting at constant temperature for 1-2h, adding an ultraviolet light absorber and an auxiliary agent, stirring and emulsifying at a speed of 600-800r/min, regulating the pH value of the emulsion to 5-6 by using acetic acid with a volume fraction of 10%, adding deionized warm water, stirring uniformly at a speed of 100-120r/min, cooling to 10 ℃, dropwise adding formaldehyde solution, heating to room temperature, and regulating to neutrality by using sodium hydroxide solution with a volume fraction of 20%, thus obtaining microcapsule suspension;
s3, post-processing: and (3) carrying out suction filtration, water washing and vacuum drying on the microcapsule suspension in the step (S2) to obtain the modified color-changing microcapsule.
By adopting the technical scheme, the color former, the color developer, the solvent and the dispersing agent are firstly prepared into a color-changing core material mixed system, and the dispersing agent is mixed to prevent agglomeration between monomers in the later stage of reaction; then the wall material and the color-changing core material are subjected to high-temperature melt blending, and then an ultraviolet light absorber and an auxiliary agent are added to optimize the performance of the wall; finally, the modified color-changing microcapsule with shorter production period and higher yield can be prepared through post-treatment.
Preferably, the thermally conductive material comprises one or more of aluminum oxide, magnesium oxide and zinc oxide.
By adopting the technical scheme, the inorganic heat conduction zero-dimensional filler aluminum oxide, magnesium oxide and zinc oxide are added into the concrete base material, so that on one hand, the inorganic heat conduction filler has better phonon transfer thermal property, and a heat conduction network favorable for phonon transfer can be formed. When the concrete surface obtains heat radiation, the temperature difference is formed inside the concrete, heat is transferred along the direction of lattice vibration in the form of phonons, and solar radiation received by the concrete surface is efficiently converted into heat energy to be transferred into the inside modified color-changing microcapsules so as to quickly change the color. The bulk density inside the concrete can be increased by adding the inorganic heat conducting filler, so that the porosity and the pore diameter inside the concrete are reduced, and the self heat conducting property is further improved; on the other hand, the problem of insufficient mechanical properties caused by adding high molecular organic matters in the concrete base material can be solved by adding the inorganic heat conducting filler, so that the mechanical strength of the concrete is further improved.
Preferably, the light guide material comprises yttrium aluminum garnet and polycarbonate colloidal particles, and the mass ratio of the yttrium aluminum garnet to the polycarbonate colloidal particles is 1: (0.70-0.90).
By adopting the technical scheme, yttrium aluminum garnet and polycarbonate colloidal particles are added into the concrete base material to improve the light transmittance of the concrete, so that the sunlight irradiation part received by the surface of the concrete is transferred to the modified color-changing microcapsule in the concrete to activate the photochromic component in the microcapsule core material, and the sensitivity of the color change is further enhanced. The yttrium aluminum garnet has higher permeability to visible light and infrared light, and can enhance the light guide efficiency of the concrete; the concrete has high mechanical strength and can be used for reinforcing the concrete; the concrete has stable physical and chemical properties, and can be matched with other components in the concrete well. The polycarbonate is used as a stable high-molecular polymer light-transmitting material, so that the light-transmitting property of the concrete is improved, and meanwhile, the toughness of the concrete can be improved.
Preferably, the raw materials of the polycarbonate colloidal particles comprise polycarbonate and silicate fluorescent powder, and the mass ratio of the polycarbonate to the silicate fluorescent powder is 1: (0.08-0.15).
By adopting the technical scheme, silicate fluorescent powder is physically doped into the polycarbonate main body, the fluorescent powder taking silicate as a matrix has better chemical stability and irradiation resistance, and the fluorescent powder can be excited in sunlight conduction irradiation after being coated by the stable material polycarbonate and mixed into a concrete system, and the excitation and emission spectrum is wide and continuously adjustable. The silicate fluorescent powder can absorb photons in the transparent polycarbonate colloid to generate a certain degree of electron energy level transition so as to generate fluorescence, thereby realizing secondary luminescence, changing the light source property, widening the spectrum range, indirectly exciting the photochromic component in the modified color-changing microcapsule to generate color change, and further improving the color-changing sensitivity of the product concrete to the environmental temperature; and yttrium aluminum garnet in the light guide material can reduce the probability of non-radiative transition, so that the luminous quantum efficiency of the silicate fluorescent powder is enhanced by compounding.
Preferably, the water reducer is one or more of naphthalene water reducer, polycarboxylate water reducer and aliphatic water reducer; the defoaming agent is one or more of an organosilicon defoaming agent and an amino polyether defoaming agent.
Through adopting above-mentioned technical scheme, select naphthalene water-reducing agent, polycarboxylate water-reducing agent and aliphatic water-reducing agent to use can make carboxyl and the hydroxyl on the water-reducing agent molecular main chain produce on water conservancy granule surface and adsorb for water-reducing agent molecule is arranged on water conservancy granule surface orientation. Meanwhile, carboxyl and hydroxyl are taken as groups with stronger polarity, after the water reducer is arranged in an oriented mode, part of polar carboxyl and hydroxyl point to a liquid phase, and the surface of the cement particle has the same charge due to hydrolysis of part of hydrophilic polar groups. Under the action of electrostatic repulsive force, the flocculent structure formed by hydration on the surfaces of the cement particles is disassembled to release free water in the cement particles, so that the mixing water consumption is effectively reduced under the condition of maintaining the slump of the concrete basically unchanged. The water reducer has a dispersing effect on cement particles after being added into the concrete mixture, so that the working performance of the concrete can be improved, and the fluidity of the concrete mixture can be improved; the organic silicon defoamer and the amino polyether defoamer are selected to reduce the surface tension of substances at a high speed, and are spread on the surface of foam generated in the concrete mixture, so that the surface strength, elasticity and viscosity of a liquid film are reduced to realize a good defoaming effect, and the organic silicon defoamer and the amino polyether defoamer have good compatibility with the concrete system components. Meanwhile, since voids generated in the concrete by bubbles seriously affect the vibration transmission of phonons, the defoamer ensures the heat diffusion efficiency of the heat conducting material by improving the internal compactness of the concrete.
In a second aspect, the application provides a method for preparing color-changing concrete, comprising the following steps:
s1, mixing cement, coarse aggregate, fine aggregate and water, and uniformly stirring to obtain concrete slurry;
s2, sequentially adding a heat conducting material, a water reducing agent and a defoaming agent into the concrete slurry in the step S1, and uniformly stirring at a speed of 1000-1100r/min to prepare a concrete primary material;
s3, adding the modified color-changing microcapsule into the initial concrete material in the step S2, uniformly stirring at the speed of 100-200r/min, and then adding the light guide material, stirring and distributing the mixture to the upper surface to obtain the color-changing concrete.
By adopting the technical scheme, the conventional raw materials are mixed to prepare the concrete slurry, and the heat conducting material is added for high-speed stirring to realize uniform dispersion in the concrete slurry, so that the uniform heat diffusion efficiency of all positions of the whole concrete is ensured, and the heat transfer is uniform; then adding the modified color-changing microcapsule for slow stirring, and uniformly dispersing the modified color-changing microcapsule in the concrete without damaging the microcapsule structure due to mechanical stirring; finally, the light guide material is stirred and distributed on the upper layer of the concrete to form a light-transmitting light guide structure preliminarily, so that the photo-heat of solar radiation is fully utilized in the color change reaction of the modified color change microcapsule, and the color change sensitivity of the color change concrete product is further improved.
In summary, the application has the following beneficial effects:
1. in the application, a ternary organic color-changing composite material is formed by a color former, a color developer and a solvent, wherein 4-methoxy-2-methyl diphenylamine and bromoindoline spirobenzopyran are selected as multicomponent compound color former. On the one hand, 4-methoxy-2-methyldiphenylamine is the main thermochromic material, which reacts with the developer at a lower temperature, while the solvent exists in a solid form, promoting the formation of the developer-developer complex. Along with the increase of the external temperature, electron transfer occurs between the color-changing core material system and the color-developing agent, so that the molecular structure of the 4-methoxy-2-methyl diphenylamine is rearranged, different molecular structures correspond to different spectrum absorption bands, and meanwhile, the solvent is melted to generate interaction, so that the color-changing core material system is converted from dark black into a colorless state, and the overall color-changing reaction of the concrete is realized macroscopically. On the other hand, the bromoindoline spirobenzopyran is taken as a spiropyran photochromic material, and can carry out light blue fading color change on a color development spectrum according to solar radiation received by the surface of the concrete and illumination transmitted to the inside through a light guide material, thereby enhancing the thermochromic effect exerted by 4-methoxy-2-methyl diphenylamine.
2. According to the application, the inorganic heat conduction zero-dimensional filler aluminum oxide, magnesium oxide and zinc oxide are added into the concrete base material, so that on one hand, the inorganic heat conduction filler has good phonon transfer thermal property, and a heat conduction network beneficial to phonon transfer can be formed. When the concrete surface obtains heat radiation, the temperature difference is formed inside the concrete, heat is transferred along the direction of lattice vibration in the form of phonons, and solar radiation received by the concrete surface is efficiently converted into heat energy to be transferred into the inside modified color-changing microcapsules so as to quickly change the color. The bulk density inside the concrete can be increased by adding the inorganic heat conducting filler, so that the porosity and the pore diameter inside the concrete are reduced, and the self heat conducting property is further improved; on the other hand, the problem of insufficient mechanical properties caused by adding high molecular organic matters in the concrete base material can be solved by adding the inorganic heat conducting filler, so that the mechanical strength of the concrete is further improved.
3. In the application, the polycarbonate main body is physically mixed with silicate fluorescent powder in the light guide material, the fluorescent powder taking silicate as a matrix has better chemical stability and irradiation resistance, and the fluorescent powder can be excited in sunlight conduction irradiation after being coated by the polycarbonate which is a stable material and mixed into a concrete system, and the excitation and emission spectrum is wide and continuously adjustable. The silicate fluorescent powder can absorb photons in the transparent polycarbonate colloid to generate a certain degree of electron energy level transition so as to generate fluorescence, thereby realizing secondary luminescence, changing the light source property, widening the spectrum range, indirectly exciting the photochromic component in the modified color-changing microcapsule to generate color change, and further improving the color-changing sensitivity of the product concrete to the environmental temperature; and yttrium aluminum garnet in the light guide material can also reduce the probability of non-radiative transition, so that the luminous quantum efficiency of the silicate fluorescent powder is enhanced by compounding.
Detailed Description
The present application will be described in further detail with reference to examples.
The raw materials used in examples and comparative examples are all commercially available.
Preparation example
Preparation of modified color-changing microcapsule
Preparation example 1, a preparation method of a modified color-changing microcapsule, adopts the following method:
(1) Preparing a color-changing core material: mixing 14g of color former, 19g of color former, 72g of solvent and 9g of dispersing agent, uniformly stirring at the speed of 300r/min, heating to 85 ℃ in water bath, uniformly stirring at the speed of 140r/min for 25min after the system is uniform, and cooling at room temperature to obtain a color-changing core material;
(2) Microcapsule suspension preparation: heating 260g of wall material and the color-changing core material in the step (1) to 60 ℃ for melt blending, reacting at constant temperature for 1.5h, adding 7g of ultraviolet light absorbent and 10g of auxiliary agent, stirring and emulsifying at the speed of 700r/min, regulating the pH value of the emulsion to 5 by using acetic acid with the volume fraction of 10%, adding deionized warm water, stirring uniformly at the speed of 110r/min, cooling to 10 ℃, dropwise adding formaldehyde solution, heating to room temperature, and regulating to neutrality by using sodium hydroxide solution with the volume fraction of 20%, thus obtaining microcapsule suspension;
(3) Post-treatment: and (3) carrying out suction filtration, water washing and vacuum drying on the microcapsule suspension in the step (2) to obtain the modified color-changing microcapsule.
Preparation example 2, a preparation method of the modified color-changing microcapsule, adopts the following method:
(1) Preparing a color-changing core material: mixing 18g of color former, 24g of color former, 85g of solvent and 10g of dispersing agent, uniformly stirring at the speed of 400r/min, heating to 105 ℃ in water bath, uniformly stirring at the speed of 180r/min for 30min after the system is uniform, and cooling at room temperature to obtain a color-changing core material;
(2) Microcapsule suspension preparation: heating 320g of wall material and the color-changing core material in the step (1) to 65 ℃ for melt blending, reacting at constant temperature for 2 hours, adding 8g of ultraviolet light absorbent and 12g of auxiliary agent, stirring and emulsifying at a speed of 800r/min, regulating the pH value of the emulsion to 5 by using acetic acid with the volume fraction of 10%, adding deionized warm water, stirring uniformly at a speed of 120r/min, cooling to 10 ℃, dropwise adding formaldehyde solution, heating to room temperature, and regulating to neutrality by using sodium hydroxide solution with the volume fraction of 20%, thus obtaining microcapsule suspension;
(3) Post-treatment: and (3) carrying out suction filtration, water washing and vacuum drying on the microcapsule suspension in the step (2) to obtain the modified color-changing microcapsule.
Preparation example 3, a preparation method of the modified color-changing microcapsule, adopts the following method:
(1) Preparing a color-changing core material: mixing 10g of color former, 14g of color former, 60g of solvent and 8g of dispersing agent, uniformly stirring at the speed of 200r/min, heating to 65 ℃ in water bath, uniformly stirring at the speed of 100r/min for 20min after the system is uniform, and cooling at room temperature to obtain a color-changing core material;
(2) Microcapsule suspension preparation: heating 200g of wall material and the color-changing core material in the step (1) to 55 ℃ for melt blending, reacting at constant temperature for 1h, adding 6g of ultraviolet light absorbent and 8g of auxiliary agent, stirring and emulsifying at the speed of 600r/min, regulating the pH value of the emulsion to 6 by using acetic acid with the volume fraction of 10%, adding deionized warm water, stirring uniformly at the speed of 100r/min, cooling to 10 ℃, dropwise adding formaldehyde solution, heating to room temperature, and regulating to neutrality by using sodium hydroxide solution with the volume fraction of 20%, thus obtaining microcapsule suspension;
(3) Post-treatment: and (3) carrying out suction filtration, water washing and vacuum drying on the microcapsule suspension in the step (2) to obtain the modified color-changing microcapsule.
Preparation example 4, a preparation method of modified color-changing microcapsule, is different from preparation example 1 in that no dispersant is added in step (1).
Preparation example 5, a preparation method of the modified color-changing microcapsule, is different from preparation example 1 in that no ultraviolet absorber is added in step (2).
Examples
Example 1, a method of preparing a color-changing concrete, comprising the steps of:
(1) Mixing 650g of cement, 1200g of coarse aggregate, 450g of fine aggregate and 190g of water, and uniformly stirring to prepare concrete slurry;
(2) Sequentially adding 65g of heat conducting material, 20g of water reducing agent and 6g of defoaming agent into the concrete slurry in the step (1), and uniformly stirring at the speed of 1100r/min to prepare a concrete primary material;
(3) Adding 70g of modified color-changing microcapsule into the initial concrete material in the step (2), uniformly stirring at the speed of 150r/min, adding 25g of light guide material, and stirring and distributing to the upper surface to prepare color-changing concrete;
wherein the modified color-changing microcapsule is derived from preparation example 1.
Example 2, a method of preparing a color-changing concrete, comprising the steps of:
(1) Mixing 700g of cement, 1300g of coarse aggregate, 500g of fine aggregate and 200g of water, and uniformly stirring to prepare concrete slurry;
(2) Sequentially adding 75g of heat conducting material, 28g of water reducing agent and 7g of defoaming agent into the concrete slurry in the step (1), and uniformly stirring at the speed of 1100r/min to prepare a concrete primary material;
(3) Adding 80g of modified color-changing microcapsule into the initial concrete material in the step (2), uniformly stirring at the speed of 200r/min, adding 30g of light guide material, and stirring and distributing to the upper surface to prepare color-changing concrete;
wherein the modified color-changing microcapsule is derived from preparation example 1.
Example 3, a method of preparing a color-changing concrete, comprising the steps of:
(1) Mixing 600g of cement, 1100g of coarse aggregate, 400g of fine aggregate and 180g of water, and uniformly stirring to prepare concrete slurry;
(2) Sequentially adding 55g of heat conducting material, 12g of water reducing agent and 5g of defoaming agent into the concrete slurry in the step (1), and uniformly stirring at the speed of 1000r/min to prepare a concrete primary material;
(3) Adding 60g of modified color-changing microcapsule into the initial concrete material in the step (2), uniformly stirring at the speed of 100r/min, and then adding 20g of light guide material, stirring and distributing to the upper surface to prepare color-changing concrete;
wherein the modified color-changing microcapsule is derived from preparation example 1.
Example 4, a color-changing concrete, differs from example 1 in that the modified color-changing microcapsules are derived from preparation example 2.
Example 5, a color-changing concrete, differs from example 1 in that the modified color-changing microcapsules are derived from preparation 3.
Example 6, a color-changing concrete, differs from example 1 in that the modified color-changing microcapsules are derived from preparation example 4.
Example 7, a color-changing concrete, differs from example 1 in that the modified color-changing microcapsules are derived from preparation 5.
Example 8, a color-changing concrete, differs from example 1 in that no thermally conductive material was added in step (2).
Example 9, a color-changing concrete, is different from example 1 in that no light guide material is added in step (3).
Example 10, a color-changing concrete, differs from example 1 in that no defoamer was added in step (2).
Comparative example
Comparative example 1, a color-changing concrete, is different from example 1 in that in the preparation method of the modified color-changing microcapsule, equal amount of bromocresol purple is used as the color former instead of 4-methoxy-2-methyldiphenylamine.
Comparative example 2, a color-changing concrete, differs from example 1 in that in the preparation method of the modified color-changing microcapsule, bisphenol a of equal amount is used as the color-developing agent instead of ethyl gallate and lauryl gallate.
Comparative example 3, a color-changing concrete, differs from example 1 in that in the preparation method of the modified color-changing microcapsule, the solvent is equal amount of cetyl alcohol instead of benzyl phenyl ether.
Comparative example 4, a color-changing concrete, differs from example 1 in that in the preparation method of the modified color-changing microcapsule, the dispersant is equal amount of polyoxyethylene nonylphenol ether instead of polyvinyl alcohol and hydroxypropyl methyl cellulose ether.
Comparative example 5, a color-changing concrete, differs from example 1 in that in the preparation of the modified color-changing microcapsules, the wall material is an equivalent amount of gelatin instead of melamine-formaldehyde resin.
Comparative example 6, a color-changing concrete, was different from example 1 in that in the preparation method of the color-changing concrete, equal amounts of boron phosphide were used as the heat conductive material instead of aluminum oxide, magnesium oxide and zinc oxide.
Performance test
Concrete was prepared according to the method in each example and each comparative example, and the concrete was fabricated into a number of standard test pieces having dimensions of 100mm×100mm×50 mm. And after curing each test block, testing the color-changing temperature, the color-changing time, the color-compounding temperature, the color-compounding time, the compressive strength and the heat conductivity coefficient. Wherein, three test blocks are taken for detection in each example or comparative example, the detection results are averaged and recorded in table 1, and the detection method is as follows:
1. color change temperature and time to change test: the test block is put into a precise thermometer, then the test block is put into a solar heating simulator, the power is increased to observe the temperature and time of color change, the temperature and time are recorded as the color change temperature and the color change time respectively, and the recording results are shown in table 1.
2. And (3) testing the compound color temperature and compound color time: the test block with the completed color change temperature and time is taken out and placed in a sealed black box at 25 ℃, the temperature and time of color change are detected electrically, and the temperature and time are recorded as the multiple color temperature and the multiple color time respectively, and the recorded results are shown in table 1.
3. Compressive strength test: the concrete prepared in examples 1 to 10 and comparative examples 1 to 6 were examined with reference to GB/T50081-2016 Standard for test method of mechanical Properties of ordinary concrete, and the examination results are shown in Table 1.
4. And (3) heat conduction coefficient test: and (3) drying the test block, placing the test block into an IM-DRY3001 intelligent double-plate heat conductivity coefficient tester, and testing the heat conductivity coefficient of the test block according to the operation procedure of the IM-DRY3001 intelligent double-plate heat conductivity coefficient tester to be accurate to 0.001W/(m.k). The thermal conductivity during the test was recorded and the test results are shown in table 1.
TABLE 1
In combination with examples 1 to 3, comparative example 1 and Table 1, the difference in temperature between the discoloration temperature and the multiple-color temperature of the concrete prepared in examples 1 to 3 was smaller than that of the concrete prepared in comparative example 1, and the discoloration time and the multiple-color time of the concrete prepared in examples 1 to 3 were both smaller than those of the concrete prepared in comparative example 1. The smaller the temperature difference between the color-changing temperature and the multiple color temperature is, the better the color-changing sensitivity of the concrete product is. The shorter the color-changing time and the color-complexing time are, the better the color-changing sensitivity of the concrete product is. As can be seen from the detection results, the bromocresol purple of triphenylmethane phthalein is adopted as a color former, and although the thermochromic phenomenon can occur in a concrete system, the bromocresol purple macroscopically shows dark brown color change to the concrete after the external temperature is increased, namely, the concrete is heated, so that the actual requirements cannot be met. Among them, the concrete prepared in example 1 had the best overall properties.
In combination with examples 1 to 3, comparative example 2 and Table 1, the difference in temperature between the discoloration temperature and the multiple color temperature of the concrete prepared in examples 1 to 3 was smaller than that of the concrete prepared in comparative example 2, and the discoloration time and the multiple color time of the concrete prepared in examples 1 to 3 were both smaller than those of the concrete prepared in comparative example 2. As can be seen from the detection result, bisphenol A is adopted as the color-developing agent, the electron accepting effect of the color-developing agent is not obviously improved, the bisphenol A has a certain harm to human health, and the actual production is difficult to put into mass production.
In combination with examples 1 to 3, comparative example 3 and Table 1, the difference in temperature between the discoloration temperature and the multiple-color temperature of the concrete prepared in examples 1 to 3 was smaller than that of the concrete prepared in comparative example 3, and the discoloration time and the multiple-color time of the concrete prepared in examples 1 to 3 were both smaller than those of the concrete prepared in comparative example 3. As can be seen from the detection result, the hexadecanol is adopted as the solvent, the phase transition temperature is higher than that of benzyl phenyl ether, the macro-appearance of the hexadecanol in a concrete system is slightly higher in color change temperature and multiple color temperature, and the hexadecanol has no advantage on the color change generated by light and heat of the concrete in the actual use environment.
In combination with examples 1 to 3, comparative example 4 and Table 1, the difference in temperature between the discoloration temperature and the multiple-color temperature of the concrete prepared in examples 1 to 3 was smaller than that of the concrete prepared in comparative example 4, and the discoloration time and the multiple-color time of the concrete prepared in examples 1 to 3 were both smaller than that of the concrete prepared in comparative example 4. The detection result shows that the nonionic dispersing agent polyoxyethylene nonylphenol ether has insufficient gel retention capacity and is difficult to effectively prevent the particles from approaching each other, so that the dispersing effect of the polymer matrix agglomeration in the high molecular polymerization process is general, and the compatibility with the color-changing core material component is poor.
In combination with examples 1 to 3, comparative example 5 and Table 1, the difference between the discoloration temperature and the multiple-color temperature of the concrete prepared in examples 1 to 3 was smaller than that of the concrete prepared in comparative example 5, the discoloration time and the multiple-color time of the concrete prepared in examples 1 to 3 were both smaller than those of the concrete prepared in comparative example 5, and the compressive strength and the thermal conductivity of the concrete prepared in examples 1 to 3 were also both superior to those of the concrete prepared in comparative example 5. As can be seen from the detection result, the gelatin is used as the wall material of the modified color-changing microcapsule, the mechanical property is poor, the wall of the microcapsule is easy to crack after high-speed stirring in the concrete preparation process, and the internal color-changing core material is caused to outflow failure.
In combination with examples 1 to 3, comparative example 6 and Table 1, the difference between the discoloration temperature and the multiple-color temperature of the concrete prepared in examples 1 to 3 was smaller than that of the concrete prepared in comparative example 6, the discoloration time and the multiple-color time of the concrete prepared in examples 1 to 3 were both smaller than that of the concrete prepared in comparative example 6, and the thermal conductivity of the concrete prepared in examples 1 to 3 was superior to that of the concrete prepared in comparative example 6. As can be seen from the detection results, boron phosphide is adopted as a heat conducting material, and high-cost high-purity boron phosphide crystals are difficult to select and use as a heat conducting filler to be added into a concrete system, so that the heat conductivity is low, and the mixing property of inorganic metal oxide cannot be achieved.
In combination with examples 1, examples 4 to 5 and Table 1, the temperature difference between the discoloration temperature and the multiple color temperature of the concrete prepared in example 1 was smaller than those of the concrete prepared in example 4 and example 5, and the discoloration time and the multiple color time of the concrete prepared in example 1 were both smaller than those of the concrete prepared in example 4 and example 5. The detection result shows that the addition amount and the reaction condition of each raw material in the preparation process of the modified color-changing microcapsule have peak values in the set range, and the thermal and photochromic effects are affected after the reaction condition is changed or the addition amount of the substance is close to the end value.
In combination with examples 1, examples 6 to 7 and table 1, the temperature difference between the discoloration temperature and the multiple color temperature of the concrete prepared from example 1 was smaller than those of the concrete prepared from example 6 and example 7, and the discoloration time and the multiple color time of the concrete prepared from example 1 were both smaller than those of the concrete prepared from example 6 and example 7. The detection result shows that the color-changing core material is not added with dispersing agent, so that aggregation is easy to occur in a polymerization system, and the exertion of functional components is influenced; the wall material is not added with ultraviolet light absorber, which affects the light transmission and absorption effect of the inside photochromic component.
In combination with example 1, example 8 and table 1, the temperature difference between the discoloration and the color-build temperature of the concrete prepared from example 1 was less than that of the concrete prepared from example 8, the discoloration time and the color-build time of the concrete prepared from example 1 were both less than that of the concrete prepared from example 8, and the thermal conductivity of the concrete prepared from example 1 was significantly higher than that of the concrete prepared from example 8. According to the detection result, the heat conductivity of the concrete can be greatly improved by mixing the heat conducting material into the concrete, so that the color changing sensitivity of the modified color changing microcapsule is indirectly improved, and meanwhile, the dry density and the compressive strength of the concrete are improved by mixing the heat conducting material.
In combination with example 1, example 9 and table 1, the temperature difference between the discoloration and the multiple color temperature of the concrete prepared from example 1 was smaller than that of the concrete prepared from example 9, and the discoloration time and the multiple color time of the concrete prepared from example 1 were both smaller than that of the concrete prepared from example 9. The detection result shows that the light transmittance of the concrete surface layer can be effectively improved by mixing the light guide material into the concrete surface layer, and the photochromic effect is generated on the bromoindoline spirobenzopyran in the modified color-changing microcapsule.
In combination with example 1, example 10 and table 1, the temperature difference between the discoloration temperature and the multiple color temperature of the concrete prepared in example 1 was smaller than that of the concrete prepared in example 10, the discoloration time and the multiple color time of the concrete prepared in example 1 were both smaller than those of the concrete prepared in example 10, and the compressive strength and the thermal conductivity of the concrete prepared in example 1 were also significantly better than those of the concrete prepared in example 10. As can be seen from the detection result, the fact that the defoaming agent is not added into the concrete leads to the formation of a large number of bubbles with larger volume in the concrete, and the structures of the bubbles not only influence the overall mechanical properties of the concrete, but also influence the heat phonon transfer in the concrete, so that the heat conductivity of the concrete is obviously reduced.
The present embodiment is only for explanation of the present application and is not to be construed as limiting the present application, and modifications to the present embodiment, which may not creatively contribute to the present application as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present application.
Claims (8)
1. The color-changing concrete is characterized by comprising the following components in parts by weight: 600-700 parts of cement, 1100-1300 parts of coarse aggregate, 400-500 parts of fine aggregate, 180-200 parts of water, 60-80 parts of modified color-changing microcapsules, 55-75 parts of heat conducting material, 20-30 parts of light conducting material, 12-28 parts of water reducer and 5-7 parts of defoamer.
2. The color-changing concrete according to claim 1, wherein the modified color-changing microcapsule comprises the following components in parts by weight: 10-18 parts of a color former, 14-24 parts of a color developer, 60-85 parts of a solvent, 8-10 parts of a dispersing agent, 6-8 parts of an ultraviolet light absorber, 200-320 parts of a wall material and 8-12 parts of an auxiliary agent;
wherein the color former is 4-methoxy-2-methyl diphenylamine and bromoindoline spirobenzopyran, and the mass ratio of the 4-methoxy-2-methyl diphenylamine to the bromoindoline spirobenzopyran is 1: (0.20-0.30);
the color developing agent is one or more of ethyl gallate and lauryl gallate;
the solvent is benzyl phenyl ether;
the dispersing agent is one or more of polyvinyl alcohol and hydroxypropyl methyl cellulose ether;
the ultraviolet light absorber is 2, 2-hydroxy-4-n-octoxybenzophenone;
the wall body material is melamine-formaldehyde resin;
the auxiliary agent is 2, 6-di-tert-butyl-p-cresol.
3. The color-changing concrete according to claim 2, wherein the preparation method of the modified color-changing microcapsule comprises the following steps:
s1, preparing a color-changing core material: mixing the color former, the color developer, the solvent and the dispersing agent, uniformly stirring at the speed of 200-400r/min, heating to 65-105 ℃ in a water bath, uniformly stirring at the constant temperature of 100-180r/min for 20-30min after the system is uniform, and cooling at room temperature to obtain the color-changing core material;
s2, preparing microcapsule suspension: heating the wall material and the color-changing core material in the step S1 to 55-65 ℃ for melt blending, reacting at constant temperature for 1-2h, adding an ultraviolet light absorber and an auxiliary agent, stirring and emulsifying at a speed of 600-800r/min, regulating the pH value of the emulsion to 5-6 by using acetic acid with a volume fraction of 10%, adding deionized warm water, stirring uniformly at a speed of 100-120r/min, cooling to 10 ℃, dropwise adding formaldehyde solution, heating to room temperature, and regulating to neutrality by using sodium hydroxide solution with a volume fraction of 20%, thus obtaining microcapsule suspension;
s3, post-processing: and (3) carrying out suction filtration, water washing and vacuum drying on the microcapsule suspension in the step (S2) to obtain the modified color-changing microcapsule.
4. A color-changing concrete according to claim 1, characterized in that the heat-conducting material comprises one or more of aluminum oxide, magnesium oxide and zinc oxide.
5. The color-changing concrete according to claim 1, wherein the light guiding material comprises yttrium aluminum garnet and polycarbonate colloidal particles, and the mass ratio of the yttrium aluminum garnet to the polycarbonate colloidal particles is 1: (0.70-0.90).
6. The color-changing concrete according to claim 5, wherein the raw materials of the polycarbonate colloidal particles comprise polycarbonate and silicate fluorescent powder, and the mass ratio of the polycarbonate to the silicate fluorescent powder is 1: (0.08-0.15).
7. A color-changing concrete according to claim 1, characterized in that the water reducing agent is one or more of naphthalene-based water reducing agent, polycarboxylate water reducing agent and aliphatic water reducing agent;
the defoaming agent is one or more of an organosilicon defoaming agent and an amino polyether defoaming agent.
8. A method for preparing a color-changing concrete according to any one of claims 1 to 7, comprising the steps of:
s1, mixing cement, coarse aggregate, fine aggregate and water, and uniformly stirring to obtain concrete slurry;
s2, sequentially adding a heat conducting material, a water reducing agent and a defoaming agent into the concrete slurry in the step S1, and uniformly stirring at a speed of 1000-1100r/min to prepare a concrete primary material;
s3, adding the modified color-changing microcapsule into the initial concrete material in the step S2, uniformly stirring at the speed of 100-200r/min, and then adding the light guide material, stirring and distributing the mixture to the upper surface to obtain the color-changing concrete.
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