CN113292771B - Rubber plastic alloy for warm mixing and preparation method and application thereof - Google Patents
Rubber plastic alloy for warm mixing and preparation method and application thereof Download PDFInfo
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- C08L19/00—Compositions of rubbers not provided for in groups C08L7/00 - C08L17/00
- C08L19/003—Precrosslinked rubber; Scrap rubber; Used vulcanised rubber
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- 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
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- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
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- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
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- C08F293/00—Macromolecular compounds obtained by polymerisation on to a macromolecule having groups capable of inducing the formation of new polymer chains bound exclusively at one or both ends of the starting macromolecule
- C08F293/005—Macromolecular compounds obtained by polymerisation on to a macromolecule having groups capable of inducing the formation of new polymer chains bound exclusively at one or both ends of the starting macromolecule using free radical "living" or "controlled" polymerisation, e.g. using a complexing agent
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Abstract
The invention relates to the technical field of highway asphalt, in particular to a rubber-plastic alloy for warm mixing and a preparation method and application thereof. The rubber plastic alloy for warm mixing is mainly prepared from the following raw materials in parts by weight: 15-20 parts of recycled plastic particles, 58-68 parts of modified asphalt rubber powder, 1-2 parts of dispersing agent, 15-19 parts of polymerization monomer, 0.5-1.0 part of initiator and 0.3-0.5 part of catalyst. The rubber-plastic alloy for warm mixing enables the asphalt to be better spread on the aggregate in the mixing process, and reduces the contact angle between the asphalt and the aggregate interface; the lipophilic chain segment of the block high molecular polymer is combined with the rubber-plastic alloy or the asphalt, the crystal water is volatilized to form a lubricating film, the hydrophilic group is adsorbed on the surface of the aggregate, the lubricating film can offset the influence of the viscosity increase of the asphalt when the temperature is reduced, the low-temperature construction workability of the asphalt mixture is improved, and the warm mixing effect is achieved. The warm-mixing rubber plastic alloy provided by the invention is novel in preparation method and ingenious in design. The warm-mixed asphalt has few intermediate links in the process production, transparent and monitorable materials and simple process and easy control.
Description
Technical Field
The invention relates to the technical field of highway asphalt, in particular to a rubber-plastic alloy for warm mixing and a preparation method and application thereof.
Background
The rubber-plastic alloy asphalt mixture is mainly produced by a wet method. In the wet production process, the rubber-plastic material can be accelerated to soften under high temperature conditions, and then the rubber-plastic material and the asphalt can fully act to become a part of the asphalt cementing material, so that the viscosity of the matrix asphalt is improved. However, the rubber-plastic alloy is difficult to disperse in asphalt and scorch at an excessively high temperature, so that the shearing time is strictly controlled in production to prevent excessive degradation, and the production process is complex and complicated. The modified asphalt obtained by modifying the rubber-plastic alloy has the problems of high viscosity, high mixing temperature, high energy consumption, large smoke pollution and the like when the pavement is paved.
The warm mixing process can overcome the defects of complex process, high energy consumption, large smoke pollution and the like of a wet process in the prior art, and can reduce the temperature of the hot-mixed asphalt. The invention discloses a rubber-plastic alloy for a warm-mixed asphalt mixture and a preparation method thereof in CN 102010532B, wherein the processing and extrusion melting temperature is 150-260 ℃, and the melting index of the rubber-plastic alloy is improved, so that the rubber-plastic alloy can be directly fed. However, the method damages partial cross-linking structure in the rubber powder, and causes partial loss of the modification performance of the rubber powder; meanwhile, a large amount of smoke is released in the processing and extruding process, so that the environmental pollution is caused.
Therefore, how to obtain the modification effect of the wet process in the warm mixing process, and the characteristics of low pollution and easy construction of the dry process are the difficult problems to be solved urgently in the asphalt industry at present.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention aims to provide the rubber-plastic alloy for warm mixing, which can realize low-temperature mixing when the temperature is reduced by 20-40 ℃, improve the low-temperature construction workability of an asphalt mixture and realize the warm mixing effect, thereby realizing the warm-mixing direct-feeding of the rubber-plastic alloy. The invention provides a preparation method of the warm-mix rubber plastic alloy, and the warm-mix rubber plastic alloy is prepared by a phase inversion method, and is novel in preparation method and ingenious in design. Meanwhile, the invention also provides an asphalt mixture using the warm-mix rubber-plastic alloy and a preparation method thereof.
In order to realize the purpose, the technical scheme provided by the invention is as follows:
the invention provides a rubber plastic alloy for warm mixing, which is mainly prepared from the following raw materials in parts by weight: 15-20 parts of recycled plastic particles, 58-68 parts of modified asphalt rubber powder, 1-2 parts of dispersing agent, 15-19 parts of polymerization monomer, 0.5-1.0 part of initiator and 0.3-0.5 part of catalyst.
On the basis of the technical scheme, the recycled plastic particles are one or a mixture of recycled low-density polyethylene, high-density polyethylene and polypropylene particles in any proportion. Specifically, the particle size is 100-200 meshes.
On the basis of the technical scheme, the modified asphalt rubber powder is C1 or C2 vulcanized rubber powder, the particle size is 100-200 meshes, and the technical index of the modified asphalt rubber powder conforms to the vulcanized rubber powder GB/T19208-2008.
On the basis of the technical scheme, the dispersing agent is one or more of polyvinyl alcohol, polyacrylamide, polyethylene glycol, polyvinylpyrrolidone, sodium polyacrylate, sodium polyaspartate or dispersing agents BYK-AT203, BYK-AT204, BYK-9076, BYK-9077, BYK-103 and BYK-104 of BYK company. Specifically, the degree of polymerization of polyvinyl alcohol is 1000-1500, and the degree of hydrolysis is more than 95%; the polyacrylamide is cationic or nonionic, and the viscosity-average molecular weight is 100-; polyethylene glycol 3000-6000 is selected as polyethylene glycol; the molecular weight of the polyvinylpyrrolidone is 25000-40000; the molecular weight of the sodium polyacrylate is 4000-10000; the molecular weight of the sodium polyaspartate is 10000-30000.
On the basis of the technical scheme, the polymerized monomer comprises the following raw materials: the polymerization monomer comprises the following raw materials: polar monomer, non-polar monomer and styrene, and the mass fraction ratio is 40:40: 20.
On the basis of the technical scheme, the polar monomer is one or more of acrylic acid, methacrylic acid, acrylic acid, methacrylic acid and maleic acid monoester of C2-C4 aliphatic diol; the non-polar monomer is one or more of acrylic acid, methacrylic acid, C6, C8 and C12 fatty alcohol ester of sorbic acid.
On the basis of the technical scheme, the initiator is one of azobisisobutyronitrile, azobisisovaleronitrile, azobisisoheptonitrile and azobiscyclohexyl carbonitrile.
The catalyst is prepared from one of ferrous chloride, ruthenium chloride and nickel chloride, N, N, N' -pentamethyldiethylenetriamine, 2-pyridine formaldehyde N-propylamine and a bis (dimethyl amino ethyl ether) complex according to the mass ratio of 5:2:2:1, and controllable free radical polymerization reaction is realized.
The invention provides a preparation method of a rubber plastic alloy for warm mixing, which comprises the following steps:
step one, free radical controllable polymerization: adding the regenerated plastic particles, the modified asphalt glue powder, the dispersing agent, the catalyst, the solvent and deionized water into a reaction kettle, introducing nitrogen or argon for replacement for three times, adding the initiator, performing argon replacement again, sequentially adding the non-polar monomer, the polar monomer and the styrene, and stirring and reacting for 4-8 hours at the rotation speed of 150-200rpm and the temperature of 60-80 ℃; the specific solvent is one of ethyl acetate, butyl acetate, propyl acetate, isopropyl acetate, tetrahydrofuran, methyl tetrahydrofuran, acetone, methyl ethyl ketone, methyl isopropyl ketone and methyl isobutyl ketone.
Step two, phase inversion coating: adding 3000 portions of water plus 5000 portions of water into the reaction kettle within 2-3h, carrying out phase inversion at the rotating speed of 500 plus 6500rpm, and continuously stirring for 5-6h at the temperature of 10-25 ℃;
step three, centrifuging: the product of the warm-mixed rubber-plastic alloy is obtained by centrifugal separation at 5000 plus 6000 rpm.
Specifically, the recycled modified asphalt powder adopted in the invention has a cross-linking structure, so that the impact resistance of the asphalt mixture can be improved. In order to keep the resilience and the anti-shearing capability, the invention adopts a novel method combining free radical controllable polymerization and phase inversion coating with ingenious design to prepare the core-shell structure material taking the rubber-plastic alloy as the core and the block high polymer coating as the shell, and the specific preparation method is as described above.
In the reaction process of forming the amphiphilic block polymer through the free radical controllable polymerization reaction in the step one, rubber and plastic alloy particles are suspended in a water-in-oil emulsion formed by a solvent and deionized water under the action of a dispersing agent, under the protection of inert gas and at a set reaction temperature, a non-polar monomer, a polar monomer and polyethylene are added in batches, the free radical controllable polymerization is adopted to generate the styrene acrylic block high molecular polymer in situ, and polar and non-polar chain segments in the molecular structure of the high molecular polymer are distributed orderly, so that the amphiphilic block polymer has hydrophilic and oleophilic amphiphilic characteristics and contains part of crystal water.
In the phase inversion coating of the step two, the amphiphilic polymer water-in-oil emulsion formed by the controllable free radical polymerization in the step one in a suspended and dispersed mode is added with proper amount of water, and the water-in-oil emulsion generates phase inversion to form an oil-in-water emulsion; the solvent penetrates into the water phase to generate demulsification, the high molecular polymer is separated out in the reaction system and coated on the surface of the rubber-plastic alloy to form a core-shell structure of the polymer-coated rubber-plastic alloy, and the surface of the core-shell structure contains polar groups, so that the core-shell structure contains part of crystal water.
The invention provides an application of the rubber-plastic alloy for warm mixing in an asphalt mixture, and particularly relates to the rubber-plastic alloy for warm mixing, wherein the using amount of the rubber-plastic alloy for warm mixing is 20% of that of asphalt in the asphalt mixture. .
The invention also provides a specific preparation method of the warm-mixing rubber-plastic alloy applied to the asphalt mixture, which comprises the following steps:
step one, aggregate in the mixing drill is heated to 190 ℃ at 180 ℃, warm-mixing rubber-plastic alloy preheated to 130 ℃ is added in batches within 1min, and the mixture is rapidly stirred for 80-90s at 800rpm at 600 ℃ and 800 ℃, and the rubber-plastic alloy on the surface of the aggregate can be observed to be uniformly covered;
step two, hot asphalt at 155 ℃ is sprayed according to the grading, and the mixture is continuously mixed for 90s at 600-800 rpm;
adding mineral powder and continuously mixing for 90 s;
step four, curing at 140 ℃ for 0.5 h;
and step five, manufacturing a rubber-plastic alloy modified concrete part with the size of 300mm x 50mm and the compaction temperature of 135 ℃.
In the process of mixing the asphalt mixture, the polarity of the oleophylic chain segment on the surface of the rubber-plastic alloy modifier with the core-shell structure is similar to that of the matrix asphalt, and the nonpolar side chain of the block high polymer is dissolved in the asphalt based on the similar intermiscibility principle, so that the bonding property between the asphalt and the rubber-plastic alloy is improved; the hydrophilic chain segment has high polarity and affinity with the aggregate surface, so that the hydrophilic chain segment and the aggregate surface are easy to spread uniformly, and the contact angle of the interface between the rubber-plastic alloy asphalt mixture and the aggregate is reduced. In addition, in the mixing process, the crystal water combined on the surface of the rubber-plastic alloy is partially gasified by heating to form micro-foam, so that an emulsification effect is generated, a lubricating layer is formed on the interface of the aggregate and the rubber-plastic asphalt, and the lubricating film can still offset the influence of the increase of the viscosity of the asphalt when the temperature is reduced, so that the low-temperature construction workability of the asphalt mixture is improved, the low-temperature warm-mixing effect is achieved, and the warm-mixing direct-throwing feeding of the rubber-plastic alloy is realized.
Due to the amphiphilic action of the block polymer film coating layer, the surface interfacial tension of each component is reduced, and the matrix asphalt, the aggregate and the rubber-plastic alloy can be tightly combined after being mixed and stirred. In addition, the warm mix asphalt process provided by the invention has the advantages of few intermediate links, transparent and monitorable materials, simple process and easy control. The matrix asphalt needs lower heating temperature, and the energy consumption required by heating the modified asphalt can be saved. Meanwhile, the emission of volatile organic compounds such as sulfur dioxide, carbon dioxide, nitrogen oxides and the like is greatly reduced, and the environmental pollution is reduced.
The technical scheme provided by the invention has the beneficial effects that:
1. the modified asphalt rubber powder selected by the invention is vulcanized rubber powder conforming to highway modification, the particle sizes of the selected waste plastics and rubber powder are small, the waste plastics and rubber powder are uniformly dispersed without large particles, and the recycled plastics are the most abundant plastics in life, such as PP and PE, and have low price and wide sources. The recycled plastic has an isolation effect on rubber powder, and the plastic and the rubber powder in a proper proportion can ensure that the rubber-plastic alloy has excellent dispersibility and does not generate adhesion, and has higher impact resistance, rebound resilience and shear resistance.
2. The rubber-plastic alloy for warm mixing can adsorb block high molecular polymer containing 3-5% of crystal water, so that asphalt can be better spread on aggregate in the mixing process, and the contact angle of the interface of the asphalt and the aggregate is reduced; a part of chain segments of the block high molecular polymer are hydrophilic groups, and a part of chain segments of the block high molecular polymer are lipophilic groups; in the mixing process, the lipophilic chain segment is combined with the rubber-plastic alloy or the asphalt, the crystal water is volatilized to form a lubricating film, one end of the hydrophilic group is adsorbed on the surface of the aggregate, the lubricating film can offset the influence of the viscosity increase of the asphalt when the temperature is reduced, the low-temperature construction workability of the asphalt mixture is improved, and the warm mixing effect is achieved.
3. The warm-mixed rubber-plastic alloy provided by the invention is novel in preparation method and ingenious in design. The warm-mixed asphalt has few intermediate links in the process production, transparent and monitorable materials and simple process and easy control. The matrix asphalt needs lower heating temperature, and the energy consumption required by heating the modified asphalt can be saved. Meanwhile, the emission of volatile organic compounds such as sulfur dioxide, carbon dioxide, nitrogen oxides and the like is greatly reduced, and the environmental pollution is reduced.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the contents in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. It is to be understood that the various starting materials of the present invention may be commercially available, unless otherwise specified.
Example 1
The invention provides a rubber plastic alloy for warm mixing, which is mainly prepared from the following raw materials in parts by weight: 15 parts of low-density polyethylene, 68 parts of modified asphalt rubber powder, 1 part of polyvinyl alcohol, 15 parts of a polymerization monomer, 0.5 part of azodiisobutyronitrile and 0.5 part of a catalyst. Specifically, the catalyst is prepared from 50% of ferrous chloride, 20% of N, N, N' -pentamethyldiethylenetriamine, 20% of 2-pyridine formaldehyde-condensed-N-propylamine and 10% of a bis (dimethylaminoethyl ether) complex.
The invention provides a preparation method of a rubber-plastic alloy for warm mixing, which comprises the following steps:
step one, free radical controllable polymerization: adding 15 parts of low-density polyethylene, 68 parts of modified asphalt glue powder, 1 part of polyvinyl alcohol, 0.5 part of catalyst, 500 parts of ethyl acetate and 100 parts of deionized water into a reaction kettle, introducing nitrogen for three times, adding 0.5 part of initiator, sequentially adding non-polar monomer, polar monomer and styrene after nitrogen replacement again, wherein the total amount is 15 parts, and stirring and reacting at the rotation speed of 150 plus materials and 200rpm and the temperature of 60-80 ℃ for 4-8 hours;
step two, phase inversion coating: adding 5000 parts of water into the reaction kettle for 2.5h, carrying out phase inversion at the rotating speed of 6500rpm, and continuously stirring for 5h at 17 ℃;
step three, centrifuging: and centrifugally separating at 5000rpm to obtain the product of the warm-mixed rubber-plastic alloy.
The invention provides an asphalt mixture using the rubber-plastic alloy for warm mixing, which comprises the following raw materials: aggregate, warm-mix rubber-plastic alloy, asphalt and mineral powder, wherein the amount of the warm-mix rubber-plastic alloy is 20% of that of the asphalt.
The invention also provides a preparation method of the asphalt mixture, which comprises the following steps:
step one, aggregate in a mixing drill is heated to 180 ℃, warm-mixed rubber-plastic alloy preheated to 130 ℃ is added in batches within 1min, the mixture is rapidly stirred for 90s at 600rpm, and the rubber-plastic alloy on the surface of the aggregate can be observed to be uniformly covered;
step two, hot asphalt at 155 ℃ is sprayed according to the grading, and the mixture is continuously mixed for 90s at 600 rpm;
adding mineral powder and continuously mixing for 90 s;
step four, curing for 0.5h at 140 ℃;
and step five, manufacturing a rubber-plastic alloy modified concrete part with the size of 300mm x 50mm and the compaction temperature of 135 ℃.
Example 2
The invention provides a rubber plastic alloy for warm mixing, which is mainly prepared from the following raw materials in parts by weight: 17 parts of high-density polyethylene, 63 parts of modified asphalt rubber powder, 2 parts of polyacrylamide, 17 parts of a polymerization monomer, 0.7 part of azodiisovaleronitrile and 0.3 part of a catalyst. Specifically, the catalyst is prepared from 50% of ruthenium chloride, 20% of N, N, N' -pentamethyldiethylenetriamine, 20% of 2-pyridine formaldehyde-condensed-N-propylamine and 10% of a bis (dimethylaminoethyl ether) complex.
The invention provides a preparation method of a rubber plastic alloy for warm mixing, which comprises the following steps:
step one, free radical controllable polymerization: adding 17 parts of high-density polyethylene, 63 parts of modified asphalt glue powder, 2 parts of polyacrylamide, 0.3 part of catalyst, 500 parts of methyl isopropyl ketone and 100 parts of deionized water into a reaction kettle, introducing argon for replacement for three times, adding 0.7 part of initiator, sequentially adding a non-polar monomer, a polar monomer and styrene after argon replacement again, wherein the total amount is 17 parts, and stirring and reacting at the rotation speed of 175rpm and the temperature of 70 ℃ for 8 hours;
step two, phase inversion coating: adding 3000 parts of water into the reaction kettle for 3 hours, carrying out phase inversion at the rotating speed of 6000rpm, and continuously stirring for 5.5 hours at the temperature of 25 ℃;
step three, centrifuging: the product of the warm-mixed rubber-plastic alloy is obtained by 5500rpm centrifugal separation.
The invention provides an asphalt mixture using the rubber-plastic alloy for warm mixing, which comprises the following raw materials: aggregate, warm-mix rubber-plastic alloy, asphalt and mineral powder, wherein the amount of the warm-mix rubber-plastic alloy is 20% of that of the asphalt.
The invention also provides a preparation method of the asphalt mixture, which comprises the following steps:
step one, aggregate in a mixing drill is heated to 185 ℃, warm-mixed rubber-plastic alloy preheated to 130 ℃ is added in batches within 1min, the mixture is rapidly stirred for 85s at 800rpm, and the rubber-plastic alloy on the surface of the aggregate can be observed to be uniformly covered;
step two, hot asphalt at 155 ℃ is sprayed according to the grading, and the mixture is continuously mixed for 90s at 700 rpm;
adding mineral powder and continuously mixing for 90 s;
step four, curing for 0.5h at 140 ℃;
and step five, manufacturing the rubber-plastic alloy modified concrete product with the size of 300mm x 50mm and the compaction temperature of 135 ℃.
Example 3
The invention provides a rubber plastic alloy for warm mixing, which is mainly prepared from the following raw materials in parts by weight: 10 parts of polypropylene, 5 parts of low-density polyethylene, 5 parts of high-density polyethylene, 58 parts of modified asphalt glue powder, 1.5 parts of sodium polyaspartate, 19 parts of polymerization monomer, 1.5 parts of azodicyclohexyl carbonitrile and 0.4 part of catalyst. Specifically, the catalyst is prepared from 50% of nickel chloride, 20% of N, N, N' -pentamethyldiethylenetriamine, 20% of 2-pyridine formaldehyde N-propylamine and 10% of a bis (dimethylaminoethyl ether) complex.
The invention provides a preparation method of a rubber plastic alloy for warm mixing, which comprises the following steps:
step one, free radical controllable polymerization: adding 10 parts of polypropylene, 5 parts of low-density polyethylene, 5 parts of high-density polyethylene, 58 parts of modified asphalt glue powder, 1.5 parts of sodium polyaspartate, 0.4 part of catalyst, 500 parts of acetone and 100 parts of deionized water into a reaction kettle, introducing argon for three times for replacement, adding 1.5 parts of azodicyclohexyl carbonitrile, sequentially adding non-polar monomers, polar monomers and styrene after argon replacement again, totaling 19 parts, and stirring and reacting at the rotation speed of 150rpm and the temperature of 80 ℃ for 6 hours;
step two, phase inversion coating: adding 4000 parts of water into the reaction kettle for 2 hours, carrying out phase inversion at the rotating speed of 5000rpm, and continuously stirring for 6 hours at the temperature of 10 ℃;
step three, centrifuging: and centrifugally separating at 5000rpm to obtain the product of the warm-mixed rubber-plastic alloy.
The invention provides an asphalt mixture using the rubber-plastic alloy for warm mixing, which comprises the following raw materials: aggregate, warm-mix rubber-plastic alloy, asphalt and mineral powder, wherein the amount of the warm-mix rubber-plastic alloy is 20% of that of the asphalt.
The invention also provides a preparation method of the asphalt mixture, which comprises the following steps:
step one, aggregate in a mixing drill is heated to 190 ℃, warm-mixed rubber-plastic alloy preheated to 130 ℃ is added in batches within 1min, the mixture is rapidly stirred for 85s at 700rpm, and the rubber-plastic alloy on the surface of the aggregate can be observed to be uniformly covered;
step two, hot asphalt at 155 ℃ is sprayed according to the grading, and the mixture is continuously mixed for 90s at 700 rpm;
adding mineral powder and continuously mixing for 90 s;
step four, curing for 0.5h at 140 ℃;
and step five, manufacturing a rubber-plastic alloy modified concrete part with the size of 300mm x 50mm and the compaction temperature of 135 ℃.
Comparative example 1
The invention provides a rubber plastic alloy for warm mixing, which is mainly prepared from the following raw materials in parts by weight: 17 parts of high-density polyethylene, 63 parts of modified asphalt rubber powder, 2 parts of polyacrylamide, 17 parts of a polymerization monomer, 0.7 part of azodiisovaleronitrile and 0.3 part of a catalyst. Specifically, the catalyst is prepared from 50% of ruthenium chloride, 20% of N, N, N' -pentamethyldiethylenetriamine, 20% of 2-pyridine formal-N-propylamine and 10% of a bis (dimethylaminoethyl ether) complex.
The invention provides a preparation method of a rubber plastic alloy for warm mixing, which comprises the following steps:
step one, free radical controllable polymerization: adding 17 parts of high-density polyethylene, 63 parts of modified asphalt mastic powder, 2 parts of polyacrylamide, 0.3 part of catalyst, 500 parts of methyl isopropyl ketone and 100 parts of deionized water into a reaction kettle, introducing argon for replacement for three times, adding 0.7 part of azodiisovaleronitrile, performing argon replacement again, sequentially adding a non-polar monomer, a polar monomer and styrene to total 17 parts, and stirring and reacting at the rotating speed of 175rpm and the temperature of 70 ℃ for 8 hours;
step two, phase inversion coating: adding 3000 parts of water into the reaction kettle for 3 hours, carrying out phase inversion at the rotating speed of 6000rpm, and continuously stirring for 5.5 hours at 25 ℃;
step three, centrifuging: the product of the warm-mixed rubber-plastic alloy is obtained by 5500rpm centrifugal separation.
The invention provides an asphalt mixture using the rubber-plastic alloy for warm mixing, which comprises the following raw materials: aggregate, warm-mix rubber-plastic alloy, asphalt and mineral powder, wherein the amount of the warm-mix rubber-plastic alloy is 20% of that of the asphalt.
The invention also provides a preparation method of the asphalt mixture, which comprises the following steps:
step one, aggregate in a mixing drill is heated to 180 ℃, warm-mixed rubber-plastic alloy preheated to 130 ℃ is added in batches within 1min, the mixture is rapidly stirred for 90s at 600rpm, and the rubber-plastic alloy on the surface of the aggregate can be observed to be uniformly covered;
step two, spraying hot asphalt at 180 ℃ according to the grading, and continuously mixing at 600rpm for 90 s;
adding mineral powder and continuously mixing for 90 s;
step four, curing at 140 ℃ for 0.5 h;
and step five, manufacturing a rubber-plastic alloy modified concrete part with the size of 300mm x 50mm and the compaction temperature of 135 ℃.
Comparative example 2
The invention provides a rubber plastic alloy for warm mixing, which is mainly prepared from the following raw materials in parts by weight: 10 parts of polypropylene, 5 parts of low-density polyethylene, 5 parts of high-density polyethylene, 58 parts of modified asphalt glue powder, 1.5 parts of sodium polyaspartate, 19 parts of polymerization monomer, 1.5 parts of azodicyclohexyl carbonitrile and 0.4 part of catalyst. Specifically, the catalyst is prepared from 50% of nickel chloride, 20% of N, N, N' -pentamethyldiethylenetriamine, 20% of 2-pyridine formaldehyde N-propylamine and 10% of a bis (dimethylaminoethyl ether) complex.
The invention provides a preparation method of a rubber plastic alloy for warm mixing, which comprises the following steps:
step one, free radical controllable polymerization: adding 10 parts of polypropylene, 5 parts of low-density polyethylene, 5 parts of high-density polyethylene, 58 parts of modified asphalt mastic powder, 1.5 parts of sodium polyaspartate, 0.4 part of catalyst, 500 parts of acetone and 100 parts of deionized water into a reaction kettle, introducing argon for replacement for three times, adding 1.5 parts of azodicyclohexyl carbonitrile, performing argon replacement again, sequentially adding a non-polar monomer, a polar monomer and styrene, totaling 19 parts, and stirring and reacting at the rotation speed of 150rpm and the temperature of 80 ℃ for 6 hours;
step two, phase inversion coating: 4000 parts of water is added into the reaction kettle for 2 hours, phase inversion is carried out at the rotating speed of 5000rpm, and stirring is continued for 6 hours at the temperature of 10 ℃;
step three, centrifuging: and centrifugally separating at 5000rpm to obtain the product of the warm-mixed rubber-plastic alloy.
The invention provides an asphalt mixture using the rubber-plastic alloy for warm mixing, which comprises the following raw materials: aggregate, warm-mix rubber-plastic alloy, asphalt and mineral powder, wherein the amount of the warm-mix rubber-plastic alloy is 20% of that of the asphalt.
The invention also provides a preparation method of the asphalt mixture, which comprises the following steps:
step one, heating aggregate in a mixing drill to 185 ℃, adding warm-mixed rubber-plastic alloy preheated to 150 ℃ in batches within 1min, and rapidly stirring for 85s at 800rpm, wherein the rubber-plastic alloy on the surface of the aggregate can be observed to be uniformly covered;
step two, injecting hot asphalt at 160 ℃ according to the grading, and continuously mixing and stirring for 90s at 700 rpm;
adding mineral powder and continuously mixing for 90 s;
step four, curing at 140 ℃ for 0.5 h;
and step five, manufacturing a rubber-plastic alloy modified concrete part with the size of 300mm x 50mm and the compaction temperature of 135 ℃.
Comparative example 3
The invention provides a rubber plastic alloy for warm mixing, which is mainly prepared from the following raw materials in parts by weight: 15 parts of low-density polyethylene, 68 parts of modified asphalt rubber powder, 1 part of polyvinyl alcohol, 15 parts of a polymerized monomer, 0.5 part of azobisisobutyronitrile and 0.5 part of a catalyst. Specifically, the catalyst is prepared from 50% of ferrous chloride, 20% of N, N, N' -pentamethyldiethylenetriamine, 20% of 2-pyridine formaldehyde-condensed-N-propylamine and 10% of a bis (dimethylaminoethyl ether) complex.
The invention provides a preparation method of a rubber-plastic alloy for warm mixing, which comprises the following steps:
step one, free radical controllable polymerization: adding 15 parts of low-density polyethylene, 68 parts of modified asphalt glue powder, 1 part of polyvinyl alcohol, 0.5 part of catalyst, 500 parts of ethyl acetate and 100 parts of deionized water into a reaction kettle, introducing nitrogen for three times for replacement, adding 0.5 part of initiator, sequentially adding non-polar monomer, polar monomer and styrene after nitrogen replacement again, wherein the total amount is 15 parts, and stirring and reacting at the rotation speed of 200rpm and the temperature of 60 ℃ for 6 hours;
step two, phase inversion coating: adding 5000 parts of water into the reaction kettle for 2.5h, carrying out phase inversion at the rotating speed of 6500rpm, and continuously stirring for 5h at 17 ℃;
step three, centrifugation: centrifugally separating at 5000rpm to obtain the product of the warm-mixed rubber-plastic alloy.
The invention provides an asphalt mixture using the rubber-plastic alloy for warm mixing, which comprises the following raw materials: aggregate, warm-mix rubber-plastic alloy, asphalt and mineral powder, wherein the amount of the warm-mix rubber-plastic alloy is 20% of that of the asphalt.
The invention also provides a preparation method of the asphalt mixture, which comprises the following steps:
step one, aggregate in the mixing drill is heated to 190 ℃, warm-mixed rubber-plastic alloy preheated to 160 ℃ is added in batches within 1min, the mixture is rapidly stirred for 85s at 700rpm, and the surface of the aggregate can be observed to be uniformly covered by the rubber-plastic alloy;
step two, spraying hot asphalt at 170 ℃ according to the grading, and continuously mixing at 700rpm for 90 s;
adding mineral powder and continuously mixing for 90 s;
step four, curing at 140 ℃ for 0.5 h;
and step five, manufacturing a rubber-plastic alloy modified concrete part with the size of 300mm x 50mm and the compaction temperature of 135 ℃.
Comparative example 4
The invention provides a rubber plastic alloy for warm mixing, which is mainly prepared from the following raw materials in parts by weight: 15 parts of low-density polyethylene, 68 parts of modified asphalt rubber powder, 1 part of polyvinyl alcohol, 15 parts of butyl acrylate, 0.5 part of azobisisobutyronitrile and 0.5 part of catalyst. Specifically, the catalyst is prepared from 50% of ferrous chloride, 20% of N, N, N' -pentamethyldiethylenetriamine, 20% of 2-pyridine formal-N-propylamine and 10% of a bis (dimethylaminoethyl ether) complex.
The invention provides a preparation method of a rubber-plastic alloy for warm mixing, which comprises the following steps:
step one, free radical controllable polymerization: adding 15 parts of low-density polyethylene, 68 parts of modified asphalt glue powder, 1 part of polyvinyl alcohol, 0.5 part of catalyst, 500 parts of ethyl acetate and 100 parts of deionized water into a reaction kettle, introducing nitrogen for three times for replacement, adding 0.5 part of initiator, adding 15 parts of butyl acrylate after nitrogen replacement again, accounting for 15 parts, and stirring and reacting at the rotating speed of 200rpm and the temperature of 60 ℃ for 6 hours;
step two, phase inversion coating: adding 5000 parts of water into the reaction kettle for 2.5h, carrying out phase inversion at the rotating speed of 6500rpm, and continuously stirring for 5h at 17 ℃;
step three, centrifugation: centrifugally separating at 5000rpm to obtain the product of the warm-mixed rubber-plastic alloy.
The invention provides an asphalt mixture using the rubber-plastic alloy for warm mixing, which comprises the following raw materials: aggregate, warm-mix rubber-plastic alloy, asphalt and mineral powder, wherein the amount of the warm-mix rubber-plastic alloy is 20% of that of the asphalt.
The invention also provides a preparation method of the asphalt mixture, which comprises the following steps:
step one, aggregate in a mixing drill is heated to 185 ℃, warm-mixed rubber-plastic alloy preheated to 130 ℃ is added in batches within 1min, the mixture is rapidly stirred for 85s at 800rpm, and the rubber-plastic alloy on the surface of the aggregate can be observed to be uniformly covered;
step two, spraying 145 ℃ hot asphalt according to the grading, and continuously mixing at 700rpm for 90 s;
adding mineral powder and continuously mixing for 90 s;
step four, curing at 140 ℃ for 0.5 h;
and step five, manufacturing the rubber-plastic alloy modified concrete product with the size of 300mm x 50mm and the compaction temperature of 135 ℃.
Comparative example 5
The comparative example is a DS-CRM-1 type modifier of a commercial rubber-plastic alloy asphalt modifier, and the mixing temperature is 180 ℃.
The invention provides an asphalt mixture using the commercial rubber-plastic alloy asphalt modifier DS-CRM-1 type modifier, which comprises the following raw materials: aggregate, a DS-CRM-1 type modifier, asphalt and mineral powder, wherein the dosage of the DS-CRM-1 type modifier is 20% of that of the asphalt.
The invention also provides a preparation method of the asphalt mixture, which comprises the following steps:
step one, heating aggregate in a mixing drill barrow to 190 ℃, adding DS-CRM-1 type modifier preheated to 170 ℃ in 1min in batches, and stirring quickly for 85s at 700rpm, wherein uniform coverage of the surface of the aggregate by rubber-plastic alloy can be observed;
step two, injecting hot asphalt at 180 ℃ according to the grading, and continuously mixing and stirring for 90s at 700 rpm;
adding mineral powder and continuously mixing for 90 s;
step four, curing at 140 ℃ for 0.5 h;
and step five, manufacturing a rubber-plastic alloy modified concrete part with the size of 300mm x 50mm and the compaction temperature of 135 ℃.
Experimental results and Performance analysis
The concrete parts obtained in examples 1-3 and comparative examples 1-5 are subjected to rutting test (T0719-1993) and freeze-thaw splitting test (T0729-2000) according to JTJ052-2000 Experimental protocols for road engineering asphalt and asphalt mixtures, and the high temperature performance and the water damage resistance of the asphalt mixture are correspondingly characterized.
(1) Porosity factor
TABLE 1 Bituminous mixture porosity test results
| Test item | Void fraction/%) |
| Example 1 | 3.72 |
| Example 2 | 3.65 |
| Example 3 | 3.71 |
| Comparative example 1 | 3.64 |
| Comparative example 2 | 3.71 |
| Comparative example 3 | 3.70 |
| Comparative example 4 | 4.81 |
| Comparative example 5 | 4.12 |
(2) High temperature Performance characterization
TABLE 2 rutting test results for asphalt mixtures
| Test items | Dynamic stability/times/mm |
| Example 1 | 9073 |
| Example 2 | 11078 |
| Example 3 | 8936 |
| Comparative example 1 | 11080 |
| Comparative example 2 | 8930 |
| Comparative example 3 | 9122 |
| Comparative example 4 | 3564 |
| Comparative example 5 | 9112 |
(3) Resistance to water damage
TABLE 3 Freeze-thaw splitting test results for asphalt mixtures
| Mix type | TSR/％ |
| Example 1 | 82.3 |
| Example 2 | 88.2 |
| Example 3 | 83.6 |
| Comparative example 1 | 88.5 |
| Comparative example 2 | 83.7 |
| Comparative example 3 | 81.9 |
| Comparative example 4 | 65 |
| Comparative example 5 | 82 |
According to the test results in tables 1 to 3, the smaller the void ratio of the asphalt mixture is, i.e. the smaller the permeability coefficient is, the better the water impermeability of the asphalt mixture is; the higher the dynamic stability, the better the stability, the more excellent the anti-rutting performance and the better the high temperature resistance; a greater freeze-thaw cleavage strength ratio (TSR) indicates a better resistance to water damage. According to the data of the examples 1-3 and the comparative examples 1-3, the warm-mixed rubber-plastic alloy modifier can achieve the performance advantage after being warm-mixed at 130 ℃, and even if the temperature is raised, the water seepage resistance, the high temperature resistance and the water damage resistance of the modifier are not obviously improved; it can be seen from the data of comparative example 4 that the polymerized monomers are essential components of the present invention and the components are required to function with each other.
While there have been shown and described what are at present considered to be the basic principles and essential features of the invention and advantages thereof, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present specification describes embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and it is to be understood that all embodiments may be combined as appropriate by one of ordinary skill in the art to form other embodiments as will be apparent to those of skill in the art from the description herein.
Claims (6)
1. The rubber-plastic alloy for warm mixing is characterized by being mainly prepared from the following raw materials in parts by weight: 15-20 parts of recycled plastic particles, 58-68 parts of modified asphalt rubber powder, 1-2 parts of a dispersant, 15-19 parts of a polymerization monomer, 0.5-1.0 part of an initiator and 0.3-0.5 part of a catalyst;
wherein the recycled plastic particles are one or a mixture of recycled low-density polyethylene, high-density polyethylene and polypropylene particles in any proportion; the modified asphalt rubber powder is C1 or C2 vulcanized rubber powder; the polymerization monomer comprises the following raw materials: the weight percentage ratio of the polar monomer to the non-polar monomer to the styrene is 40:40:20, and the polar monomer is one or more of acrylic acid, methacrylic acid, acrylic acid, methacrylic acid and maleic acid monoester of C2-C4 aliphatic diol; the non-polar monomer is one or more of acrylic acid, methacrylic acid, C6, C8 and C12 fatty alcohol ester of sorbic acid; the catalyst is prepared from one of ferrous chloride, ruthenium chloride and nickel chloride, N, N, N' -pentamethyldiethylenetriamine, 2-pyridine formaldehyde N-propylamine and a bis (dimethyl amino ethyl ether) complex according to the mass ratio of 5:2:2: 1.
2. The rubber-plastic alloy for warm mixing according to claim 1, wherein the particle size of the modified asphalt rubber powder is 100-200 meshes, and the technical index of the modified asphalt rubber powder meets the technical index of vulcanized rubber powder GB/T19208-2008.
3. The rubber-plastic alloy for warm mixing according to claim 1, wherein the dispersant is one or more of polyvinyl alcohol, polyacrylamide, polyethylene glycol, polyvinylpyrrolidone, sodium polyacrylate, sodium polyaspartate or dispersant BYK-AT203, BYK-AT204, BYK-9076, BYK-9077, BYK-103 and BYK-104 from BYK.
4. Rubber-plastic alloy for warm mixing according to claim 1, wherein the initiator is one of azobisisobutyronitrile, azobisisovaleronitrile, azobisisoheptonitrile and azobiscyclohexyl carbonitrile.
5. The preparation method of the warm-mix rubber-plastic alloy according to any one of claims 1 to 4, characterized by comprising the following steps:
step one, free radical controllable polymerization: adding the regenerated plastic particles, the modified asphalt rubber powder, the dispersing agent, the catalyst, the solvent and deionized water into a reaction kettle, introducing nitrogen or argon for replacement for three times, adding the initiator, performing argon replacement again, sequentially adding the non-polar monomer, the polar monomer and the styrene, and stirring and reacting for 4-8 hours at the rotation speed of 150-200rpm and the temperature of 60-80 ℃;
step two, phase inversion coating: adding 3000 portions of water plus 5000 portions of water into the reaction kettle within 2-3h, carrying out phase inversion at the rotating speed of 500 plus 6500rpm, and continuously stirring for 5-6h at the temperature of 10-25 ℃;
step three, centrifuging: the product of the warm-mixed rubber-plastic alloy is obtained by centrifugal separation at 5000-.
6. The use of the warm-mix rubber-plastic alloy according to any one of claims 1 to 4 in asphalt mixtures, wherein the amount of the warm-mix rubber-plastic alloy is 20% of the amount of asphalt in the asphalt mixtures.
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