CN116514457A - Flame-retardant asphalt mixture and preparation method thereof - Google Patents
Flame-retardant asphalt mixture and preparation method thereof Download PDFInfo
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- CN116514457A CN116514457A CN202310582202.0A CN202310582202A CN116514457A CN 116514457 A CN116514457 A CN 116514457A CN 202310582202 A CN202310582202 A CN 202310582202A CN 116514457 A CN116514457 A CN 116514457A
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- 239000003063 flame retardant Substances 0.000 title claims abstract description 101
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 title claims abstract description 100
- 239000010426 asphalt Substances 0.000 title claims abstract description 93
- 239000000203 mixture Substances 0.000 title claims abstract description 65
- 238000002360 preparation method Methods 0.000 title abstract description 47
- 239000000243 solution Substances 0.000 claims abstract description 31
- -1 hydroxyl compound Chemical class 0.000 claims abstract description 30
- 150000001875 compounds Chemical class 0.000 claims abstract description 21
- 238000002156 mixing Methods 0.000 claims abstract description 20
- XUWVIABDWDTJRZ-UHFFFAOYSA-N propan-2-ylazanide Chemical compound CC(C)[NH-] XUWVIABDWDTJRZ-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000007864 aqueous solution Substances 0.000 claims abstract description 16
- 239000011159 matrix material Substances 0.000 claims abstract description 16
- 239000004743 Polypropylene Substances 0.000 claims abstract description 15
- 229920001155 polypropylene Polymers 0.000 claims abstract description 15
- 238000003756 stirring Methods 0.000 claims abstract description 15
- NKWPZUCBCARRDP-UHFFFAOYSA-L calcium bicarbonate Chemical compound [Ca+2].OC([O-])=O.OC([O-])=O NKWPZUCBCARRDP-UHFFFAOYSA-L 0.000 claims abstract description 12
- 229910000020 calcium bicarbonate Inorganic materials 0.000 claims abstract description 12
- 239000012188 paraffin wax Substances 0.000 claims abstract description 12
- 239000004205 dimethyl polysiloxane Substances 0.000 claims abstract description 11
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims abstract description 11
- BIKXLKXABVUSMH-UHFFFAOYSA-N trizinc;diborate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]B([O-])[O-].[O-]B([O-])[O-] BIKXLKXABVUSMH-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000010438 heat treatment Methods 0.000 claims abstract description 10
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 9
- 239000011707 mineral Substances 0.000 claims abstract description 9
- 239000000843 powder Substances 0.000 claims abstract description 9
- 239000004575 stone Substances 0.000 claims abstract description 9
- 238000001035 drying Methods 0.000 claims abstract description 8
- 238000005406 washing Methods 0.000 claims abstract description 8
- 239000002994 raw material Substances 0.000 claims abstract description 7
- 238000007720 emulsion polymerization reaction Methods 0.000 claims abstract description 6
- 239000012074 organic phase Substances 0.000 claims description 24
- 238000000034 method Methods 0.000 claims description 21
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims description 14
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims description 14
- 239000000347 magnesium hydroxide Substances 0.000 claims description 14
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims description 14
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 12
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 12
- 239000003795 chemical substances by application Substances 0.000 claims description 9
- 239000012267 brine Substances 0.000 claims description 6
- 239000011780 sodium chloride Substances 0.000 claims description 6
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 6
- 238000000967 suction filtration Methods 0.000 claims description 5
- 238000010276 construction Methods 0.000 abstract description 5
- 230000007547 defect Effects 0.000 abstract description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 12
- 239000012796 inorganic flame retardant Substances 0.000 description 11
- 230000000694 effects Effects 0.000 description 10
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 8
- 229910001868 water Inorganic materials 0.000 description 7
- 229910000019 calcium carbonate Inorganic materials 0.000 description 6
- 239000004568 cement Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- 239000001569 carbon dioxide Substances 0.000 description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 description 4
- 239000004567 concrete Substances 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000000779 smoke Substances 0.000 description 3
- 239000004094 surface-active agent Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000008346 aqueous phase Substances 0.000 description 2
- 239000011384 asphalt concrete Substances 0.000 description 2
- JYYOBHFYCIDXHH-UHFFFAOYSA-N carbonic acid;hydrate Chemical compound O.OC(O)=O JYYOBHFYCIDXHH-UHFFFAOYSA-N 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000000693 micelle Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002341 toxic gas Substances 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000002775 capsule Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 230000005251 gamma ray Effects 0.000 description 1
- 239000011256 inorganic filler Substances 0.000 description 1
- 229910003475 inorganic filler Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000009423 ventilation Methods 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
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/26—Bituminous materials, e.g. tar, pitch
-
- 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
- C04B40/0046—Premixtures of ingredients characterised by their processing, e.g. sequence of mixing the ingredients when preparing the premixtures
-
- 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
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/28—Fire resistance, i.e. materials resistant to accidental fires or high temperatures
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses a flame-retardant asphalt mixture and a preparation method thereof, and belongs to the technical field of tunnel construction, wherein the flame-retardant asphalt mixture comprises matrix asphalt, mineral powder, crushed stone and a flame retardant; the flame retardant is prepared from an aqueous solution containing 8-12 parts of hydroxyl compound, 2-3 parts of zinc borate and 3-5 parts of calcium bicarbonate and a solution containing 8-12 parts of poly-N-isopropylamide, 4-8 parts of polypropylene, 3-7 parts of paraffin and 10-15 parts of polydimethylsiloxane through emulsion polymerization, washing and drying; the preparation method of the flame-retardant asphalt mixture comprises the following steps: mixing and stirring crushed stone and mineral powder to obtain a mixture; heating the matrix asphalt to 150-165 ℃, stirring, adding the mixture and the rest raw materials, and wet-mixing to obtain the flame-retardant asphalt mixture. The flame retardant has the characteristics of solving the defect caused by excessive addition of the oxyhydrogen compound flame retardant and simultaneously having excellent flame retardant property.
Description
Technical Field
The invention relates to the technical field of tunnel construction, in particular to a flame-retardant asphalt mixture and a preparation method thereof.
Background
With the acceleration of the road planning network in China, the mountain road construction is further increased, the scale of tunnel and tunnel group construction in new roads in China is larger and larger, and the proportion of the total length of the tunnel to the total length of the road route is higher and higher. At present, the pavement materials used for tunnel sections are not very different from those of common roadbed sections, and two major categories are asphalt concrete and cement concrete. The common tunnel road surface type in China is cement concrete road surface, and the outside of tunnel is mostly asphalt concrete road surface, and on the one hand, cement concrete road surface intensity is high, temperature nature is good, and long service life is long, and on the other hand is because cement concrete road surface's fire resistance is better, and is brighter, but along with tunnel cement road surface's general operation, cement road surface also has the shortcoming such as antiskid performance decay very fast, the roughness is relatively poor, maintenance difficulty. Asphalt pavement is increasingly widely applied to tunnel pavement due to the advantages of flat surface, obvious noise reduction function, good driving comfort, easy maintenance and the like.
However, asphalt is used as a combustible material, and when a tunnel accident causes a fire disaster, asphalt materials can be used as combustion supporting materials in a highway tunnel to promote combustion, so that the spread is promoted, and excessive toxic gas and smoke can be emitted. Therefore, the asphalt pavement used in the tunnel has great potential safety hazard, the asphalt mixture must be subjected to flame retardant treatment, so that the asphalt mixture can be used more safely in the tunnel, and the research on the flame retardant property of the asphalt pavement of the tunnel has important practical significance.
The existing commonly used road flame retardant mainly comprises two systems of an intumescent flame retardant and an inorganic flame retardant, wherein the intumescent flame retardant takes phosphorus and nitrogen as main components, the inorganic flame retardant mainly comprises an oxyhydrogen compound, and the oxyhydrogen compound releases water vapor in a heating process to dilute surrounding combustible gas and absorb heat so as to play a flame retardant role, and the flame retardant is generally large in doping amount, belongs to an additive flame retardant, and at present, aluminum hydroxide and magnesium hydroxide have three functions of smoke abatement, flame retardance and filling at the same time, and are most widely applied, but have the defects of large filling amount and poor compatibility with asphalt, so that the flame retardant effect of the flame retardant on asphalt mixture is affected.
Disclosure of Invention
Therefore, in order to solve the defect caused by excessive addition of the oxyhydrogen compound flame retardant and simultaneously have excellent flame retardant performance, the application provides a flame retardant asphalt mixture and a preparation method thereof.
The invention is realized in such a way that a flame-retardant asphalt mixture is constructed, and the following technical scheme is adopted: the raw materials comprise, by weight, 6-12 parts of matrix asphalt, 8-15 parts of mineral powder, 80-100 parts of crushed stone and 1-3 parts of flame retardant;
the flame retardant is prepared from an aqueous solution containing 8-12 parts of hydroxyl compound, 2-3 parts of zinc borate and 3-5 parts of calcium bicarbonate, and a solution containing 8-12 parts of poly-N-isopropylamide, 4-8 parts of polypropylene, 3-7 parts of paraffin and 10-15 parts of polydimethylsiloxane through emulsion polymerization, washing and drying.
Through adopting the technical scheme, the flame retardant in the application is compounded by the oxyhydrogen compound and zinc borate, emulsion polymerization is carried out on the oxyhydrogen compound and the solution added with the poly-N-isopropylamide and the polypropylene, the poly-N-isopropylamide is grafted on the polypropylene to form a temperature-sensitive film, film holes are closed at normal temperature, and when the heating is started, the poly-N-isopropylamide grafted chain shrinkage film holes are opened to form a channel for the passage of water vapor released by the oxyhydrogen compound in the heating process, so that the surrounding combustible gas can be diluted and the heat can be absorbed, the flame retardant effect is achieved, the paraffin can also play a certain phase change role, the heat is absorbed when the morphology is changed, the temperature is lowered, and the flame retardant effect is achieved;
the calcium bicarbonate is heated to generate carbon dioxide, water and calcium carbonate, the carbon dioxide diffuses through the pore-forming film to dilute surrounding oxygen to form a nonflammable atmosphere, water vapor formed after the water is heated penetrates through the film holes to further dilute combustible gas, the calcium carbonate plays a supporting role, the influence on the high-temperature performance of the asphalt pavement is reduced, and when fire spread and the temperature is overhigh, the temperature-sensitive film and the high-temperature surface of the calcium carbonate are carbonized, so that the flame retardant effect can be achieved. The flame retardant material is polymerized into a water-in-oil substance by emulsion, so that the poly N-isopropylamide and the polypropylene not only form a temperature-sensitive film, but also realize the coating of the inorganic flame retardant, improve the compatibility of the inorganic flame retardant in asphalt, and solve the problem of high viscosity of asphalt caused by excessive addition of the inorganic flame retardant.
Optionally, the flame retardant is prepared by the following method:
adding an oxyhydrogen compound, zinc borate and calcium bicarbonate into 3-5 parts by weight of sodium chloride brine to obtain an aqueous solution;
mixing the solution of poly-N-isopropylamide, polypropylene, paraffin and polydimethylsiloxane to obtain an organic phase solution, then dripping the aqueous solution into the organic phase solution, stirring for 1-1.5h at 40-45 ℃, then radiating for 20-30min by gamma rays, and performing suction filtration, washing and room temperature drying for 4-5h to obtain the flame retardant.
By adopting the technical scheme, the inorganic filler containing the flame retardant is dissolved in sodium chloride brine and then is dripped into an organic phase solution to form a water-in-oil structure, and after gamma-ray irradiation, the poly-N-isopropylamide is grafted on polypropylene, so that the temperature-sensitive film is formed.
Optionally, the mass ratio of the oxyhydrogen compound is 1: (1.5-2) ultrafine aluminum hydroxide and magnesium hydroxide.
Optionally, 2-3 parts of silane coupling agent is also added into the organic phase solution.
By adopting the technical scheme, when the aqueous solution is added into the organic phase solution by adding the silane coupling agent into the organic phase solution, the surfaces of the aluminum hydroxide and the magnesium hydroxide in the aqueous phase are bonded with the hydrophilic end of the silane coupling agent, so that the problem that the aluminum hydroxide and the magnesium hydroxide are easy to agglomerate is solved, and the dispersion is more uniform.
Optionally, the raw materials of the flame-retardant asphalt mixture further comprise 2-5 parts by weight of warm mix agent.
By adopting the technical scheme, the warm mix agent is used as the surfactant, after the warm mix agent is added into the mixture, the surfactant micelle contacts with hot asphalt, moisture on the periphery of the micelle is rapidly evaporated and dissipated, the lipophilic is in contact with asphalt, and residual water molecules which are not dissipated are combined with the hydrophilic groups of the surfactant, so that a large amount of structural water films with lubricating functions are formed among asphalt wrapping aggregate, and the structural water films play a lubricating role in the paving and compacting processes of the mixture, so that the paving speed is improved, the mixture is easy to compact, and the cooling, mixing, paving and compacting of the mixture are realized. The difficulty that the ventilation of the long tunnel construction is difficult, and toxic gas and smoke dust generated in the mixing process and the paving process cannot be effectively evacuated is relieved.
Optionally, the mass ratio of the matrix asphalt is 1: the mixture of the heavy traffic asphalt and the modified asphalt of (2-4).
Optionally, the modified asphalt is SBS modified asphalt.
The application provides a preparation method of a flame-retardant asphalt mixture, which adopts the following technical scheme:
the preparation method of the flame-retardant asphalt mixture comprises the following steps:
mixing and stirring crushed stone and mineral powder to obtain a mixture;
heating the matrix asphalt to 150-165 ℃, stirring, adding the mixture and the rest raw materials, and wet-mixing to obtain the flame-retardant asphalt mixture.
The invention has the following advantages:
1. the flame retardant is prepared by compounding an oxyhydrogen compound and zinc borate, and simultaneously carrying out emulsion polymerization with a solution added with poly-N-isopropylamide and polypropylene, so that the flame retardant material is subjected to emulsion polymerization to form a water-in-oil substance, the poly-N-isopropylamide and the polypropylene not only form a temperature-sensitive film, but also realize the coating of the inorganic flame retardant, improve the compatibility of the inorganic flame retardant in asphalt, and solve the problem of high asphalt viscosity caused by excessive addition of the inorganic flame retardant;
2. in the application, the poly-N-isopropylamide is grafted to polypropylene to form a temperature-sensitive film, the film hole is closed at normal temperature, and when the film is heated and fires, the poly-N-isopropylamide grafted chain shrinkage film hole is opened to form a channel for water vapor released in the heating process of the oxyhydrogen compound to pass through, so that the surrounding combustible gas can be diluted, the heat can be absorbed, and the flame retardant effect is achieved;
3. in the method, the calcium bicarbonate is added and heated to generate carbon dioxide, water and calcium carbonate, the carbon dioxide diffuses through a pore-forming film to dilute surrounding oxygen to form a nonflammable atmosphere, water vapor is formed after the water is heated to further dilute combustible gas through film holes, the calcium carbonate plays a supporting role, the influence on the high-temperature performance of an asphalt pavement is reduced, and when fire spread and the temperature is too high, the temperature-sensitive film and the high-temperature surface of the calcium carbonate are carbonized, so that the flame retardant effect can be achieved;
4. the silane coupling agent is added into the organic phase solution, so that when the aqueous solution is added into the organic phase solution in a dropwise manner, the surfaces of the aluminum hydroxide and the magnesium hydroxide in the aqueous phase are bonded with the hydrophilic end of the silane coupling agent, the problem that the aluminum hydroxide and the magnesium hydroxide are easy to agglomerate is solved, and the dispersion is more uniform.
Detailed Description
The present application is further described in detail with reference to the following examples, which are specifically described: the following examples, in which no specific conditions are noted, are conducted under conventional conditions or conditions recommended by the manufacturer, and the raw materials used in the following examples are commercially available from ordinary sources except for the specific descriptions.
In the following examples, KH-550 was used as the silane coupling agent;
the granularity D50 of the superfine aluminum hydroxide is 1-50 microns, and the granularity is 325-1000 meshes;
the warm mixing agent is a warm mixing agent with the model of F8903.
The following preparation examples are examples of flame retardants
Preparation example 1
A method for preparing a flame retardant, comprising the steps of:
10 parts of oxyhydrogen compound, 2 parts of zinc borate and 4 parts of calcium bicarbonate are added into 4 parts of 5wt% sodium chloride brine to obtain an aqueous solution, wherein the oxyhydrogen compound is selected from the following components in percentage by mass: 1.8 alumina and magnesium hydroxide;
10 parts of poly-N-isopropylamide, 6 parts of polypropylene, 5 parts of paraffin and 12 parts of polydimethylsiloxane are mixed to obtain an organic phase solution, then the aqueous solution is dripped into the organic phase solution, the organic phase solution is stirred for 1h at 45 ℃, then gamma rays are irradiated for 30min, and the flame retardant is obtained through suction filtration, washing and drying at room temperature for 5 h.
Preparation example 2
A method for preparing a flame retardant, comprising the steps of:
8 parts of oxyhydrogen compound, 2 parts of zinc borate and 3 parts of calcium bicarbonate are added into 3 parts of 5wt% sodium chloride brine to obtain an aqueous solution, wherein the oxyhydrogen compound is selected from the following components in percentage by mass: 1.5 ultrafine aluminum hydroxide and magnesium hydroxide;
8 parts of poly-N-isopropylamide, 4 parts of polypropylene, 3 parts of paraffin and 10 parts of polydimethylsiloxane are mixed to obtain an organic phase solution, then the aqueous solution is dripped into the organic phase solution, the organic phase solution is stirred for 1.5 hours at 40 ℃, then gamma rays are irradiated for 20 minutes, and the flame retardant is obtained through suction filtration, washing and drying at room temperature for 4 hours.
Preparation example 3
A method for preparing a flame retardant, comprising the steps of:
12 parts of oxyhydrogen compound, 3 parts of zinc borate and 5 parts of calcium bicarbonate are added into 5 parts of 5wt% sodium chloride brine to obtain an aqueous solution, wherein the oxyhydrogen compound is selected from the following components in percentage by mass: 2 ultrafine aluminum hydroxide and magnesium hydroxide;
mixing 12 parts of poly-N-isopropylamide, 8 parts of polypropylene, 7 parts of paraffin and 15 parts of polydimethylsiloxane to obtain an organic phase solution, then dropwise adding the aqueous solution into the organic phase solution, stirring for 1h at 45 ℃, then radiating for 30min by gamma rays, and carrying out suction filtration, washing and drying for 4h at room temperature to obtain the flame retardant.
Preparation example 4
A preparation method of a flame retardant is carried out according to the method in preparation example 1, and the difference is that:
2 parts of silane coupling agent KH-550 is also added in the preparation process of the organic phase solution, and the silane coupling agent KH-550 and poly-N-isopropylamide are added together.
Preparation example 5
A preparation method of a flame retardant is carried out according to the method in preparation example 1, and the difference is that:
3 parts of silane coupling agent KH-550 is also added in the preparation process of the organic phase solution, and the silane coupling agent KH-550 and poly-N-isopropylamide are added together.
Preparation example 6
A preparation method of a flame retardant is carried out according to the method in preparation example 1, except that all the oxyhydrogen compounds are ultrafine aluminum hydroxide.
Preparation example 7
A preparation method of a flame retardant is carried out according to the method in preparation example 1, except that magnesium hydroxide is used as all the oxyhydrogen compounds.
Comparative preparation example 1
A preparation method of a flame retardant was carried out according to the method in preparation example 1, except that no calcium bicarbonate was added to the aqueous solution.
Comparative preparation example 2
A preparation method of a flame retardant was carried out in the same manner as in preparation example 1 except that paraffin wax was not added to the organic phase solution.
Comparative preparation example 3
A preparation method of a flame retardant was carried out in the same manner as in preparation example 1 except that polydimethylsiloxane was not added to the organic phase solution.
Example 1
The preparation method of the flame-retardant asphalt mixture comprises the following steps:
s1, mixing 90 parts of broken stone and 12 parts of mineral powder, and stirring to obtain a mixture;
and S2, heating 10 parts of matrix asphalt to 160 ℃, stirring, and then adding the mixture obtained in the step S1, 2 parts of the flame retardant prepared in the preparation example 1 and 3 parts of the warm-mix agent, and carrying out wet mixing to obtain the flame retardant asphalt mixture.
Wherein, the mass ratio of the matrix asphalt is 1:3 and modified asphalt, wherein the modified asphalt is SBS modified asphalt.
Example 2
The preparation method of the flame-retardant asphalt mixture comprises the following steps:
s1, mixing and stirring 80 parts of broken stone and 8 parts of mineral powder to obtain a mixture;
and S2, heating 6 parts of matrix asphalt to 150 ℃, stirring, and then adding the mixture obtained in the step S1, 1 part of the flame retardant prepared in the preparation example 2 and 2 parts of the warm-mix agent, and carrying out wet mixing to obtain the flame-retardant asphalt mixture.
Wherein, the mass ratio of the matrix asphalt is 1:2 and modified asphalt, wherein the modified asphalt is SBS modified asphalt.
Example 3
The preparation method of the flame-retardant asphalt mixture comprises the following steps:
s1, mixing and stirring 100 parts of broken stone and 15 parts of mineral powder to obtain a mixture;
and S2, heating 12 parts of matrix asphalt to 165 ℃, stirring, and then adding the mixture obtained in the step S1, 3 parts of the flame retardant prepared in the preparation example 3 and 5 parts of the warm-mix agent, and carrying out wet mixing to obtain the flame-retardant asphalt mixture.
Wherein, the mass ratio of the matrix asphalt is 1:4, the mixture of heavy traffic asphalt and modified asphalt, wherein the modified asphalt is SBS modified asphalt.
Example 4
A preparation method of a flame-retardant asphalt mixture is carried out according to the method in the example 1, except that heavy-traffic asphalt is adopted as the matrix asphalt.
Examples 5 to 8
A preparation method of a flame-retardant asphalt mixture is carried out according to the method in the embodiment 1, except that the flame retardant in the step S2 is the flame retardant prepared in the preparation examples 4-7.
Comparative example 1
A preparation method of a flame-retardant asphalt mixture is carried out according to the method in the example 1, except that the flame retardant is obtained by compounding and mixing 3.2 parts of superfine aluminum hydroxide, 4.8 parts of magnesium hydroxide and 2 parts of zinc borate.
Comparative examples 2 to 4
A method for preparing a flame-retardant asphalt mixture was carried out in the same manner as in example 1, except that the flame retardant was the flame retardant prepared in comparative preparation examples 1 to 3.
Performance detection
The asphalt mixtures prepared in the examples and comparative examples of the present application were tested for dynamic stability according to standard JTT052-2000, highway engineering asphalt and asphalt mixture test procedure, and limiting oxygen index tests were performed according to the relevant technical requirements of NB/SH/T0815-2010, asphalt combustion Performance determination-oxygen index method, and the test results are shown in Table 1 below:
table 1:
referring to table 1 above, it can be seen that the flame retardant property and road performance of the asphalt mixture prepared in the examples of the present application are better than those of the comparative examples, and referring to the detection results of examples 1 and 4, when the asphalt matrix is the heavy-traffic asphalt, the flame retardant property is slightly reduced, and the road performance is reduced; and by combining the detection results of the embodiment 1 and the embodiments 5 and 6, when the silane coupling agent is added in the preparation process of the organic phase solution, the problem that aluminum hydroxide and magnesium hydroxide are easy to agglomerate is probably solved, the two are more uniformly dispersed, the formed capsules are more uniformly distributed, and the final flame retardant property is further improved;
in combination with the test results of examples 1 and 7 and 8, it can be seen that the inorganic flame retardant is compounded with aluminum hydroxide and magnesium hydroxide, and has more excellent flame retardant performance than the inorganic flame retardant used in single application.
Referring to the test results of example 1 and comparative example 1 again, it can be seen that the flame retardant effect is greatly reduced when inorganic flame retardant is directly mixed into asphalt without water-in-oil structure, and the flame retardant effect is greatly reduced when calcium bicarbonate is not added to the flame retardant according to the test results of example 1 and comparative example 2, and the flame retardant is not added with paraffin and polydimethylsiloxane according to the test results of comparative example 3 and comparative example 4, especially when the flame retardant is not added with polydimethylsiloxane, the formation of the coating structure is affected, the final flame retardant effect is greatly reduced, and the flame retardant effect is also reduced when paraffin is not added.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. The flame-retardant asphalt mixture is characterized by comprising, by weight, 6-12 parts of matrix asphalt, 8-15 parts of mineral powder, 80-100 parts of crushed stone and 1-3 parts of flame retardant;
the flame retardant is prepared from an aqueous solution containing 8-12 parts of hydroxyl compound, 2-3 parts of zinc borate and 3-5 parts of calcium bicarbonate, and a solution containing 8-12 parts of poly-N-isopropylamide, 4-8 parts of polypropylene, 3-7 parts of paraffin and 10-15 parts of polydimethylsiloxane through emulsion polymerization, washing and drying.
2. The flame retardant asphalt mixture according to claim 1, wherein: the flame retardant is prepared by the following method:
adding an oxyhydrogen compound, zinc borate and calcium bicarbonate into 3-5 parts by weight of sodium chloride brine to obtain an aqueous solution;
mixing the solution of poly-N-isopropylamide, polypropylene, paraffin and polydimethylsiloxane to obtain an organic phase solution, then dripping the aqueous solution into the organic phase solution, stirring for 1-1.5h at 40-45 ℃, then radiating for 20-30min by gamma rays, and performing suction filtration, washing and room temperature drying for 4-5h to obtain the flame retardant.
3. The flame retardant asphalt mixture according to claim 1, wherein: the mass ratio of the oxyhydrogen compound is 1: (1.5-2) ultrafine aluminum hydroxide and magnesium hydroxide.
4. A flame retardant asphalt mixture according to claim 2, characterized in that: and 2-3 parts of silane coupling agent is also added into the organic phase solution.
5. The flame retardant asphalt mixture according to claim 1, wherein: the raw materials of the flame-retardant asphalt mixture also comprise 2-5 parts by weight of warm mix agent.
6. The flame retardant asphalt mixture according to claim 1, wherein: the mass ratio of the matrix asphalt is 1: the mixture of the heavy traffic asphalt and the modified asphalt of (2-4).
7. The flame retardant asphalt mixture according to claim 6, wherein: the modified asphalt is SBS modified asphalt.
8. The method for preparing a flame retardant asphalt mixture according to any one of claims 1 to 7, characterized in that: the method comprises the following steps:
mixing and stirring crushed stone and mineral powder to obtain a mixture;
heating the matrix asphalt to 150-165 ℃, stirring, adding the mixture and the rest raw materials, and wet-mixing to obtain the flame-retardant asphalt mixture.
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