CN110819128A - High-performance flame-retardant asphalt and preparation method thereof - Google Patents
High-performance flame-retardant asphalt and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L95/00—Compositions of bituminous materials, e.g. asphalt, tar, pitch
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2217—Oxides; Hydroxides of metals of magnesium
- C08K2003/2224—Magnesium hydroxide
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/32—Phosphorus-containing compounds
- C08K2003/321—Phosphates
- C08K2003/322—Ammonium phosphate
- C08K2003/323—Ammonium polyphosphate
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/38—Boron-containing compounds
- C08K2003/387—Borates
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- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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Abstract
The invention belongs to the technical field of flame-retardant asphalt, and particularly relates to high-performance flame-retardant asphalt and a preparation method thereof, wherein the high-performance flame-retardant asphalt comprises the following components in parts by weight: 4.5 to 7 percent of SBS modifier, 8 to 15 percent of flame retardant, 0.1 to 0.3 percent of stabilizer, 1 to 3 percent of aromatic hydrocarbon extract oil, 0.2 to 0.4 percent of PE modifier and 74.3 to 86.2 percent of matrix asphalt. According to the invention, the imported matrix asphalt is adopted, so that the basic quality of the asphalt and the stability of raw materials are integrally improved, the SBS modifier is added into the matrix asphalt, so that the high stability of the asphalt can be effectively improved, and the low-temperature crack resistance of the asphalt can be improved, the PE modifier is adopted, so that the saturated components in the asphalt can be adsorbed in a high-temperature chamber, a solution which is not easy to segregate is formed, the viscosity of the modified asphalt is reduced, the pavement performance grade of the asphalt is improved, the low-temperature performance of the modified asphalt is effectively improved under the condition of ensuring the stable high-temperature performance of the modified asphalt by adopting aromatic hydrocarbon extract oil, the low-temperature aging resistance and the low-temperature crack resistance of the modified asphalt are improved, so that.
Description
Technical Field
The invention belongs to the technical field of flame-retardant asphalt, and particularly relates to high-performance flame-retardant asphalt and a preparation method thereof.
Background
With the rapid development of the transportation industry in China, a large number of large-scale road tunnels and river-crossing tunnel projects are developed successively. The construction of the hot-mix asphalt mixture in the tunnel, particularly in a longer and larger tunnel, is difficult. In consideration of safety, durability and driving comfort, the pavement of the large-scale river-sea-crossing tunnel needs to meet the following requirements: (1) good road performance and durability; (2) the fire-retardant fireproof composite material has the functions of fire prevention and flame retardance, and can be used for organizing the fire to quickly spread when a tunnel is in fire, so that casualties and economic losses in the tunnel fire are reduced.
At present, the existing flame-retardant asphalt mainly depends on adding a halogen flame retardant to realize the flame-retardant effect, and the halogen flame retardant has poor smoke suppression effect, generates a large amount of toxic smoke during combustion and generates great harm to human bodies and the environment. Meanwhile, the flame retardant causes the corresponding reduction of the pavement performance of the flame-retardant asphalt, and is not suitable for pavement of the asphalt pavement surface layer of the high-grade highway.
Disclosure of Invention
The invention aims to provide high-performance flame-retardant asphalt which is excellent in storage stability, difficult to segregate and obvious in flame-retardant effect, and the recording performance of the flame-retardant asphalt is effectively improved.
In order to achieve the above purpose, an embodiment of the present invention provides a high performance flame retardant asphalt, which includes the following components by weight: 4.5 to 7 percent of SBS modifier, 8 to 15 percent of flame retardant, 0.1 to 0.3 percent of stabilizer, 1 to 3 percent of aromatic hydrocarbon extract oil, 0.2 to 0.4 percent of PE modifier and 74.3 to 86.2 percent of matrix asphalt.
Optionally, the SBS modifier has a linear structure and a star structure.
Optionally, the flame retardant comprises, by weight, 40-60% of magnesium hydroxide, 1-10% of zinc borate, 10-30% of ammonium polyphosphate and 1-5% of a silane coupling agent.
Optionally, the stabilizer comprises 30-40% of sulfur powder, 10-20% of plasticizer, 20% of asbestos ash, 10% of light calcium carbonate and 20-25% of carbon black by weight ratio.
Optionally, the PE modifier is a polymer polymerized from ethylene monomers.
Optionally, the aromatic extracted oil is a mixture comprising esters, alcohols and fatty acid compounds
One or more technical schemes in the high-performance flame-retardant asphalt provided by the embodiment of the invention have at least one of the following technical effects: according to the invention, the imported matrix asphalt is adopted, so that the basic quality of the asphalt and the stability of raw materials are integrally improved, the SBS modifier is added into the matrix asphalt, so that the high stability of the asphalt can be effectively improved, and the low-temperature crack resistance of the asphalt can be improved, the PE modifier is adopted, so that the saturated components in the asphalt can be adsorbed in a high-temperature chamber, a solution which is not easy to segregate is formed, the viscosity of the modified asphalt is reduced, the pavement performance grade of the asphalt is improved, the low-temperature performance of the modified asphalt is effectively improved under the condition of ensuring the stable high-temperature performance of the modified asphalt by adopting aromatic hydrocarbon extract oil, the low-temperature aging resistance and the low-temperature crack resistance of the modified asphalt are improved, so that.
Another embodiment of the present invention provides a method for preparing high-performance flame-retardant asphalt, comprising the following steps:
s100: weighing the matrix asphalt in proportion;
s200: heating the matrix asphalt to about 140 ℃, adding the PE modifier and the aromatic hydrocarbon extract oil, and fully stirring and circulating the three for 30 minutes;
s300: continuously adding the SBS modifier and the flame retardant, stirring and heating to 180 ℃, and stirring for 30 minutes under the condition that the temperature is kept at 180 ℃ and 190 ℃;
s400: high-speed shearing is carried out for 1 hour under the conditions that the temperature is 180-195 ℃ and the shearing rate is 4000 r/min;
s500: after the shearing is stopped for 30 minutes, the stabilizer is added at the temperature of 185-195 ℃, and the mixture is stirred and developed for 1 hour to prepare the high-performance flame-retardant asphalt
One or more technical schemes in the preparation method of the high-performance flame-retardant asphalt provided by the embodiment of the invention have at least one of the following technical effects: the flame-retardant asphalt disclosed by the invention is more excellent in conventional indexes, the limit oxygen index OI value can reach 23, the flame-retardant effect is obvious, the PG grade of the asphalt meets the requirements of technical indexes PG76-22 of SHRP asphalt pavement performance specifications, the pavement performance is good, the construction application range is wide, the low-temperature performance number of the flame-retardant asphalt, the mixing and dissolving effect of a flame retardant and an SBS modifier is good, the dispersion is uniform, the storage stability is good, the adhesion and the construction mixing performance are better, and the competitive advantage and the social value are stronger.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a flow chart of a method for preparing high-performance flame-retardant asphalt according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be illustrative of the embodiments of the present invention, and should not be construed as limiting the invention.
In the description of the embodiments of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. Specific meanings of the above terms in the embodiments of the present invention can be understood by those of ordinary skill in the art according to specific situations.
In one embodiment of the present invention, there is provided a high performance flame retardant asphalt comprising by weight: the SBS modifier comprises Liangrong 35012.3% and Liangrong 34112.4%, flame retardant 8.0%, stabilizer 0.2%, aromatic hydrocarbon extract oil 1.5%, PE modifier 0.2% and matrix asphalt 85.4%. The low-temperature performance of the flame-retardant asphalt is effectively improved, and the low-temperature aging resistance and the low-temperature crack resistance of the modified asphalt are improved, so that the flame-retardant asphalt has excellent storage stability, is not easy to separate, and has an obvious flame-retardant effect. In the embodiment, the limiting oxygen index OI value of the flame-retardant asphalt is greater than 20,135 ℃ and the kinematic viscosity is not greater than 3.0pa.s, and the ductility of the asphalt at 5 ℃ after aging is not less than 20 cm. Table 1 shows the performance of the high-performance flame-retardant asphalt of this example.
TABLE 1
In another embodiment of the present invention, the high performance flame retardant asphalt comprises the following components by weight: the SBS modifier comprises Liangrong 35012.6% and Liangrong 34112.6%, flame retardant 10.0%, stabilizer 0.3%, aromatic hydrocarbon extract oil 2.0%, PE modifier 0.3% and matrix asphalt 82.2%. The low-temperature performance of the flame-retardant asphalt is effectively improved, and the low-temperature aging resistance and the low-temperature crack resistance of the modified asphalt are improved, so that the flame-retardant asphalt has excellent storage stability, is not easy to separate, and has an obvious flame-retardant effect. In the embodiment, the limiting oxygen index OI value of the flame-retardant asphalt is greater than 20,135 ℃ and the kinematic viscosity is not greater than 3.0pa.s, and the ductility of the asphalt at 5 ℃ after aging is not less than 20 cm. Table 2 shows the performance of the high-performance flame-retardant asphalt of this example.
TABLE 2
In another embodiment of the present invention, the high performance flame retardant asphalt comprises the following components by weight: the SBS modifier comprises Liangrong 35012.5% and Liangrong 34112.5%, flame retardant 9.0%, stabilizer 0.2%, aromatic hydrocarbon extract oil 2.0%, PE modifier 0.2% and matrix asphalt 83.6%. The low-temperature performance of the flame-retardant asphalt is effectively improved, and the low-temperature aging resistance and the low-temperature crack resistance of the modified asphalt are improved, so that the flame-retardant asphalt has excellent storage stability, is not easy to separate, and has an obvious flame-retardant effect. In the embodiment, the limiting oxygen index OI value of the flame-retardant asphalt is greater than 20,135 ℃ and the kinematic viscosity is not greater than 3.0pa.s, and the ductility of the asphalt at 5 ℃ after aging is not less than 20 cm.
Table 3 is a table of the properties of the high-performance flame-retardant asphalt of this example.
TABLE 3
In another embodiment of the present invention, the high performance flame retardant asphalt comprises the following components by weight: the SBS modifier comprises Liangrong 35012.7% and Liangrong 34112.7%, flame retardant 11.0%, stabilizer 0.3%, aromatic hydrocarbon extract oil 2.4%, PE modifier 0.3% and matrix asphalt 80.6%. The low-temperature performance of the flame-retardant asphalt is effectively improved, and the low-temperature aging resistance and the low-temperature crack resistance of the modified asphalt are improved, so that the flame-retardant asphalt has excellent storage stability, is not easy to separate, and has an obvious flame-retardant effect. Table 4 is a table of the properties of the high-performance flame-retardant asphalt of this example.
TABLE 4
In another embodiment of the invention, the SBS modifier of the high-performance flame-retardant asphalt is in a linear structure and a star structure, wherein the molecular weight of the linear structure is 8-15 ten thousand, and the molecular weight of the star structure is 20-30 ten thousand. The SBS modifier is added into the matrix asphalt, so that the high-temperature stability of the asphalt can be effectively improved, and the low-temperature crack resistance of the asphalt can be improved.
In another embodiment of the invention, the flame retardant of the high-performance flame-retardant asphalt comprises, by weight, 40-60% of magnesium hydroxide, 1-10% of zinc borate, 10-30% of ammonium polyphosphate and 1-5% of a silane coupling agent. Wherein the appearance of the flame retardant is in the form of light yellow powder particles, the flame retardant is insoluble in water, the melting point is about 300 ℃, and the flame retardant can be uniformly dispersed in the asphalt cement through simple mechanical stirring. The main flame retardant principle of the flame retardant is that magnesium hydroxide generally starts to decompose after the temperature reaches 300 ℃ to generate magnesium oxide and water vapor, the magnesium oxide forms a layer of oxide film on the surface of asphalt, the contact between the asphalt and oxygen is isolated while heat exchange is interrupted, the water vapor can absorb heat, and the combustion temperature of the asphalt is reduced. When the temperature is higher than 300 ℃, the zinc borate is thermally decomposed, crystal water is lost, heat can be absorbed, oxygen in the air can be diluted, and a part of zinc enters the air in the form of zinc oxide or zinc hydroxide, so that the concentration of combustible gas is reduced. The ammonium polyphosphate is a high-efficiency phosphorus flame retardant, and when the temperature reaches 2 DEG, the ammonium polyphosphate is a high-efficiency phosphorus flame retardantAmmonium polyphosphate is decomposed by heat after 50 ℃ to release a large amount of NH3So that the surface of the burning material forms a barrier to isolate a part of oxygen in the air to achieve the purpose of flame retardance. The high-efficiency flame retardant mainly comprising magnesium and phosphorus is adopted, and the smoke suppressor with zinc borate is added in a flame-retardant mode to perform various flame-retardant processes such as gas phase-condensed phase-interrupted heat exchange-synergistic effect and the like, so that the addition amount is small, and the flame-retardant effect is obvious.
In another embodiment of the invention, the stabilizer of the high-performance flame-retardant asphalt comprises 30-40% of sulfur powder, 10-20% of plasticizer, 20% of asbestos ash, 10% of light calcium carbonate and 20-25% of carbon black by weight ratio, and the stabilizer is a yellow-black mixture. The addition of sulfur in the stabilizer forms a cross-linked bond, so that a network is formed between SBS and asphalt, the asbestos ash increases the adhesion of the SBS modifier, and the carbon black enhances the aging resistance.
In another embodiment of the present invention, the PE modifier of the high performance flame retardant asphalt is a polymer polymerized from ethylene monomer, and is a crystalline thermoplastic resin. The PE modifier is PE resin which is formed and processed, is wax-like granules which are extruded and granulated, is milk white in appearance, and has the molecular weight within the range of 1-10 ten thousand. The PE modifier is adopted, so that saturated components in the asphalt can be adsorbed at high temperature to form a solution which is not easy to segregate, the viscosity of the modified asphalt is reduced, and the pavement performance grade of the asphalt is improved.
In another embodiment of the invention, the aromatic extract oil of the high-performance flame-retardant asphalt is a mixture comprising esters, alcohols and fatty acid compounds. Is black brown viscous liquid at normal temperature, and has a kinematic viscosity of 10-30pa.s at 100 ℃. The principle of the aromatic extracted oil is as follows: (1) the mixture molecule contains a large amount of hydroxyl, ester and carboxyl, and the functional groups have the function of resisting thermo-oxidative aging. (2) The mixture can improve the low-temperature plasticity of the asphalt, thereby improving the low-temperature ductility of the asphalt. (3) The functional groups such as hydroxyl, carboxyl and the like in the mixture can be subjected to esterification reaction with carboxyl or hydroxyl in asphaltene and colloid in the asphalt, and the generated esterified substance also has the effect of improving the low-temperature plasticity of the asphalt. The aromatic hydrocarbon extract oil is adopted to effectively improve the low-temperature performance of the modified asphalt under the condition of ensuring the stable high-temperature performance of the modified asphalt, and improve the low-temperature aging resistance and the low-temperature crack resistance of the modified asphalt.
In another embodiment of the present invention, as shown in fig. 1, the base asphalt of the high performance flame retardant asphalt is imported No. 70 road petroleum asphalt, which improves the base quality of the asphalt and the stability of raw materials as a whole.
In another embodiment of the present invention, there is provided a method for preparing a high performance flame retardant, comprising the steps of:
s100: weighing the matrix asphalt in proportion;
s200: heating the matrix asphalt to about 140 ℃, adding the PE modifier and the aromatic hydrocarbon extract oil, and fully stirring and circulating the three for 30 minutes;
s300: continuously adding the SBS modifier and the flame retardant, stirring and heating to 180 ℃, and stirring for 30 minutes under the condition that the temperature is kept at 180 ℃ and 190 ℃;
s400: high-speed shearing is carried out for 1 hour under the conditions that the temperature is 180-195 ℃ and the shearing rate is 4000 r/min;
s500: after the shearing is stopped for 30 minutes, the stabilizer is added at the temperature of 185-195 ℃, and then the mixture is stirred and developed for 1 hour, thus obtaining the high-performance flame-retardant asphalt.
The flame-retardant asphalt disclosed by the invention is more excellent in conventional indexes, the limit oxygen index OI value can reach 23, the flame-retardant effect is obvious, the PG grade of the asphalt meets the requirements of technical indexes PG76-22 of SHRP asphalt pavement performance specifications, the pavement performance is good, the construction application range is wide, the low-temperature performance number of the flame-retardant asphalt, the mixing and dissolving effect of a flame retardant and an SBS modifier is good, the dispersion is uniform, the storage stability is good, the adhesion and the construction mixing performance are better, and the competitive advantage and the social value are stronger.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (7)
1. The high-performance flame-retardant asphalt is characterized by comprising the following components in parts by weight: 4.5 to 7 percent of SBS modifier, 8 to 15 percent of flame retardant, 0.1 to 0.3 percent of stabilizer, 1 to 3 percent of aromatic hydrocarbon extract oil, 0.2 to 0.4 percent of PE modifier and 74.3 to 86.2 percent of matrix asphalt.
2. The high-performance flame-retardant asphalt according to claim 1, wherein the SBS modifier has a linear structure and a star structure.
3. The high-performance flame-retardant asphalt according to claim 1, wherein the flame retardant comprises, by weight, 40-60% of magnesium hydroxide, 1-10% of zinc borate, 10-30% of ammonium polyphosphate and 1-5% of a silane coupling agent.
4. The high-performance flame-retardant asphalt according to claim 1, wherein the stabilizer comprises 30-40% of sulfur powder, 10-20% of plasticizer, 20% of asbestos ash, 10% of light calcium carbonate and 20-25% of carbon black by weight ratio.
5. The high-performance flame-retardant asphalt according to claim 1, wherein the PE modifier is a polymer obtained by polymerizing ethylene monomers.
6. The high-performance flame-retardant asphalt according to claim 1, wherein the aromatic hydrocarbon extract oil is a mixture comprising esters, alcohols and fatty acid compounds.
7. The preparation method of the high-performance flame retardant is characterized by comprising the following steps of:
s100: weighing the matrix asphalt in proportion;
s200: heating the matrix asphalt to about 140 ℃, adding the PE modifier and the aromatic hydrocarbon extract oil, and fully stirring and circulating the three for 30 minutes;
s300: continuously adding the SBS modifier and the flame retardant, stirring and heating to 180 ℃, and stirring for 30 minutes under the condition that the temperature is kept at 180 ℃ and 190 ℃;
s400: high-speed shearing is carried out for 1 hour under the conditions that the temperature is 180-195 ℃ and the shearing rate is 4000 r/min;
s500: after the shearing is stopped for 30 minutes, the stabilizer is added at the temperature of 185-195 ℃, and then the mixture is stirred and developed for 1 hour, thus obtaining the high-performance flame-retardant asphalt.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112300699A (en) * | 2020-11-10 | 2021-02-02 | 蜀羊防水科技有限公司 | Non-cured rubber asphalt waterproof coating and preparation method thereof |
| CN112552696A (en) * | 2020-11-28 | 2021-03-26 | 重庆交通大学 | Low-smoke flame-retardant modified asphalt suitable for paving extra-long tunnel and preparation method thereof |
| CN112920457A (en) * | 2021-01-25 | 2021-06-08 | 贵州中路交通技术有限公司 | High-modulus asphalt flame retardant |
-
2019
- 2019-10-10 CN CN201910956527.4A patent/CN110819128A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112300699A (en) * | 2020-11-10 | 2021-02-02 | 蜀羊防水科技有限公司 | Non-cured rubber asphalt waterproof coating and preparation method thereof |
| CN112552696A (en) * | 2020-11-28 | 2021-03-26 | 重庆交通大学 | Low-smoke flame-retardant modified asphalt suitable for paving extra-long tunnel and preparation method thereof |
| CN112920457A (en) * | 2021-01-25 | 2021-06-08 | 贵州中路交通技术有限公司 | High-modulus asphalt flame retardant |
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