CN113150566B - High-melt-index high-modulus asphalt mixture additive and preparation method and application thereof - Google Patents
High-melt-index high-modulus asphalt mixture additive and preparation method and application 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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- 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
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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
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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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
- 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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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/06—Properties of polyethylene
- C08L2207/066—LDPE (radical process)
Abstract
The invention discloses a high-melt-index high-modulus asphalt mixture additive, which comprises a high molecular polymer, asphalt, a lubricant, a catalyst and an anti-rutting master batch, wherein the high molecular polymer comprises high-melt-index polyolefin and high-density polyethylene; the asphalt is natural rock asphalt. The components are mixed by a high-speed mixer and then enter a double-screw extruder for melt extrusion, and the high-melt-index and high-modulus asphalt mixture additive is obtained after the components are extruded and granulated by an underwater granulator. The additive has a large melt index (140 ℃, 2.16kg) > 80g/10min, and can reduce the void ratio of the asphalt mixture, so that the prepared asphalt mixture has excellent high and low temperature performance and fatigue resistance, and the service durability of a pavement can be improved.
Description
Technical Field
The invention relates to a mixture additive, in particular to a high-melt-index high-modulus asphalt mixture additive and a preparation method and application thereof.
Background
The concept of High Modulus Asphalt Concrete (High modules Asphalt Concrete, abbreviated EME in france) originated in france. The application of the high-modulus asphalt concrete technology aims to solve the problems of insufficient track resistance of a surface layer and insufficient rigidity of a base layer of an asphalt pavement in the using process, and the asphalt pavement is successfully used in France for more than 30 years. The compactness, durability, anti-rutting capability and anti-fatigue capability of the French EME are obviously better than those of the traditional dense-graded asphalt mixture. The principle of the method is that the modulus of the asphalt concrete is improved, the deformation of the asphalt concrete under the action of vehicle load is reduced, the unrecoverable residual deformation of the asphalt concrete is reduced, the high-temperature anti-rutting performance of the pavement is improved, the fatigue performance of the pavement is improved, and the service life of the pavement is prolonged. The preparation of the high modulus asphalt concrete has two main ways: first, a low-grade hard asphalt is used; a second direct-acting high modulus agent. As the process for producing the low-grade hard asphalt in China is immature and has poor quality stability, the high-modulus asphalt concrete in China basically adopts a form of adding the high-modulus additive.
At present, many reports about high modulus modifiers are provided, wherein a French product PR PLASTS and a German product Domix can improve the rutting resistance of the asphalt pavement, but the price is expensive and the application cost is high. In China, some high modulus agent products which take waste PE and PP plastics as main raw materials are low in price, but the raw materials are unstable in source and poor in product performance stability.
Disclosure of Invention
The purpose of the invention is as follows: the first purpose of the invention is to provide a high-melt-index high-modulus asphalt mixture additive with excellent high and low temperature performance, melt dispersibility and fatigue resistance; the second object of the present invention is to provide a process for the preparation of such an additive; the third purpose of the invention is to provide an application method of the additive.
The technical scheme is as follows: the high-melt index high-modulus asphalt mixture additive comprises a high molecular polymer, asphalt, a lubricant, a catalyst and an anti-rutting master batch, wherein the high molecular polymer comprises high-melt index polyolefin and high-density polyethylene; the asphalt is natural rock asphalt.
Further comprises 200 parts by weight of anti-rutting master batch 100-one, 10-20 parts by weight of high soluble polyolefin, 10-20 parts by weight of high density polyethylene, 10-20 parts by weight of natural rock asphalt, 0.1-0.2 part by weight of lubricant and 1-6 parts by weight of catalyst.
Furthermore, the anti-rutting master batch is hard asphalt particles with a softening point higher than 120 ℃, the natural rock asphalt is North American rock asphalt or Xinjiang rock asphalt with an asphalt content higher than 95%, the asphalt content is high, the fatigue resistance of the asphalt mixture is improved, the asphalt content is low, the ash content is high, the effective components are few, and the fatigue resistance modification effect is reduced.
Further, the high-melt-index polyolefin is a polyolefin elastomer with a melt index of more than 30g/10 min; low melt index, high viscosity and difficult dispersion.
Further, the high-soluble polyolefin is one or more of VM8380, VM8780 and VM8880 of Exxon Mobil.
Further, the lubricant is one or two of oleamide and erucamide. The lubricant can reduce the friction between the material and the wall of the screw rod cylinder, reduce the viscosity of the melt and improve the processability and production effect.
Further, the catalyst is 2, 5-dimethyl-2, 5 di-tert-butyl hexane peroxide. 2, 5-dimethyl-2, 5-di-tert-butyl hexane peroxide is used as a degradation master batch of the PP melt-spraying material, has excellent degradation effect on HDPE with similar structure, can greatly reduce the molecular weight of HDPE, improves the melt index, can reduce the high-temperature viscosity of asphalt when added into the asphalt, reduces the mixing and forming temperature of asphalt mixture, improves the compactness and reduces the void ratio.
The preparation method of the high-melt-index high-modulus asphalt mixture additive comprises the following steps:
(1) adding the materials of each component into a stirrer and stirring;
(2) conveying the stirred materials to a double-screw extruder for melt extrusion;
(3) granulating and forming by an underwater granulator to obtain the final product.
Further, the temperature of a feed inlet of the double-screw extruder is 50-80 ℃, and the temperature of a melting section is 160-200 ℃; the temperature of the granulation neck ring mold is 130-. The temperature of a feed inlet of the double-screw extruder is 50-80 ℃, the temperature is too high, part of materials melt too early and are easy to bond at the feed inlet, the conveying of the materials is blocked, and the materials cannot be fed smoothly; the temperature of the melting section is 200-260 ℃, the temperature is too low, the HDPE degradation rate output is low, the melting index can not meet the requirement, the temperature is too high, the melt viscosity is too small, and the molding is difficult; the temperature of the granulating opening mold is 120-; the grain cutting rotating speed is 1500-; the rotating speed of the main screw is 200-400r/min, the rotating speed of the main screw is slow, the production efficiency is low, the rotating speed of the main screw is too fast, the retention time of materials in the screw is short, and the plasticizing effect is poor.
The application method of the high-melt index high-modulus asphalt mixture additive comprises the following steps:
(1) respectively heating matrix asphalt or SBS modified asphalt, stone and mineral powder;
(2) the stone, the mineral powder and the high-melt index high-modulus asphalt mixture additive are firstly dry-mixed to completely melt the additive and wrap the additive on the surface of the aggregate;
(3) adding the required matrix asphalt, stirring, mixing and forming to obtain the EME-14 high-modulus asphalt mixture.
Further, the mixing temperature of the matrix asphalt is 150-160 ℃, and the molding temperature is 140-150 ℃; the mixing temperature of the SBS modified asphalt is 160-170 ℃, and the forming temperature is 150-160 ℃;
further, the high-melt index and high-modulus asphalt mixture additive accounts for 1-1.5% of the mass of the asphalt mixture.
Has the advantages that: compared with the prior art, the invention has the following remarkable advantages:
(1) the high-melt-index high-modulus asphalt mixture additive disclosed by the invention adopts rock asphalt and anti-rutting master batches with high softening points as main raw materials, so that the modulus and anti-rutting performance of the asphalt mixture can be improved.
(2) The preparation method of the additive adopts a double-screw extrusion process to degrade HDPE into low-molecular-weight PE with high melt index, improves the melting and dispersing performance of HDPE in the asphalt mixture, simultaneously, the high-temperature viscosity of the low-molecular-weight PE is low, the high-temperature viscosity of asphalt can be reduced, the mixing and forming temperature of the asphalt mixture is reduced, the asphalt mixture is easier to compact, the void ratio of the asphalt mixture is reduced, and the durability of a road surface is improved.
(3) The selected high-melt-index polyolefin elastomer has excellent melting dispersibility, and simultaneously can improve the low-temperature performance of the asphalt mixture, so that the high-low-temperature performance of the prepared high-modulus asphalt mixture can be considered.
Detailed Description
The technical solution of the present invention is further explained below.
The applicant researches and discovers that the domestic patents related to high modulus modifiers have some problems, and Chinese patent CN200710178915.1 discloses an asphalt mixture anti-rutting additive, a preparation method and a use method thereof, wherein the asphalt mixture anti-rutting additive is a mixture of polyethylene resin and polypropylene resin, has low melt index, is not easy to disperse, has poor low-temperature performance and serious aging, and is difficult to melt in an asphalt mixture at a normal mixing temperature, so that the durability of a pavement is easy to reduce. Chinese patent CN201110141313 adopts low density polyethylene, softener, high density polyethylene and polycarbonate to prepare high modulus modifier, and the melt index is low, but this modifier can not reduce the mix and shaping temperature, is difficult to be used in winter low temperature environment, and the mixture low temperature performance is not enough. Chinese patent CN102199360A adopts polyethylene, polycarbonate, organic bentonite, kaolin, softener and accelerator to prepare the high-modulus and high-elasticity asphalt additive, and can improve the high-temperature anti-rutting performance and the low-temperature anti-cracking performance of the mixture. However, the polymers used have a low melt index (0.1-10g/10min) and are not readily dispersible. In addition, the high-modulus modifier prepared by the report is low in melt index, the high-temperature rutting resistance of the asphalt mixture is mainly improved, and the porosity of the prepared asphalt concrete is larger than 4%, so that the waterproof performance of the asphalt concrete is poor, and the durability of the asphalt pavement is influenced. Chinese patent CN110684365A discloses a special additive for paving an ultra-dense high-modulus asphalt mixture and a preparation method thereof, the additive is prepared by mixing a main agent of olefin derivatives through free radical polymerization with materials such as thermoplastic styrene-butadiene rubber elastomer, waste plastics, anti-rutting master batches, an antioxidant and the like, and the ultra-dense high-modulus waterproof concrete with the porosity of 1.5-4% can be prepared, and has low porosity, high rutting resistance and durability. However, the preparation of the main agent of the method adopts an olefin polymerization synthesis process, the process is complex, the equipment requirement is high, and the preparation material cost is high.
In view of the problems of low melt index, difficult dispersion, high blending and forming temperature, large porosity of the prepared high-modulus asphalt mixture, poor waterproof performance and influence on durability in the application of the existing high-modulus modifier, and the problems of complex polyolefin polymerization synthesis process, high equipment requirement and the like. Based on the practical experience and professional knowledge of the inventor for designing and manufacturing the product for many years and the application of the mechanism, the invention actively carries out research and innovation so as to create a preparation method and application of the high-melt-index high-modulus asphalt additive, so that the high-melt-index high-modulus asphalt additive is more practical.
Example 1
(1) Firstly, respectively weighing 1000g of anti-rutting master batch, 100g of Xinjiang rock asphalt, 100g of high-melt index POE VM 8380100 g, 100g of high-density polyethylene HDPE, 1g of lubricant oleamide and 1g of 2, 5-dimethyl-2, 5-di-tert-butyl hexane peroxide, putting the mixture into a high-speed stirrer for quickly stirring the mixture, and discharging the mixture after stirring for 5 min.
(2) And (2) adding the mixed material obtained in the step (1) into a feeding hopper of a double-screw extruder, carrying out extrusion granulation, wherein the temperature of a feeding hole is 80 ℃, the melting temperature is 200 ℃, the temperature of a neck mold is 140 ℃, the rotating speed of a main machine is 200r/min, the granulation speed is 1500r/min, and carrying out underwater granulation to obtain the high-melt-index high-modulus asphalt mixture additive 1.
The application of the high-melt-index high-modulus asphalt mixture additive comprises the following steps:
s1, heating matrix asphalt to 140 ℃, weighing a certain mass of aggregate heat-releasing oven according to EME-14 gradation until the aggregate is heated to 160 ℃, wherein the aggregate proportion is as follows: 1# (10-15 mm): 2# (5 to 14 mm): 3# (3-5 mm): 4# (0 to 3 mm): the mineral powder is 32: 28: 9: 28: 3;
s2, adding the heated aggregate into a 160 ℃ mixing pot, adding the high-melt-index high-modulus asphalt mixture additive 1 into the mixing pot, starting dry mixing for 20s, adding the heated matrix asphalt into the mixing pot, wherein the addition of the asphalt is calculated according to the oilstone ratio of 4.1%, and stirring for 180s after adding the asphalt to prepare the high-modulus asphalt mixture;
s3, placing the prepared high-modulus asphalt mixture into an oven, preserving heat for 10-20mmin, and forming a related test piece at 140 ℃ to test performance;
comparative example 1: preparing a high-modulus asphalt mixture by adopting an imported French PR high modulus agent: heating the matrix asphalt to 150 ℃, heating the stone to 170 ℃, and mixing the aggregate materials according to the following ratio: 1# (10-15 mm): 2# (5 to 14 mm): 3# (3 to 5 mm): 4# (0 to 3 mm): the mineral powder is 32: 28: 9: 28: 3, adding the heated stone into a 175 ℃ mixing pot, adding a prepared French PR high-modulus modifier with a certain mass into the mixing pot, stirring for 40s, adding the modified asphalt into the mixing pot, and stirring for 180s to prepare a high-modulus modified asphalt mixture; and finally, forming the prepared high-modulus mixed material at 165 ℃ and testing the performance.
TABLE 1 high modulus additive and high modulus asphalt mixture technical index prepared according to the invention
As can be seen from table 1, the high modulus asphalt mixture prepared in example 1 has better high dynamic stability at high temperature, dynamic modulus, low temperature crack resistance, water loss resistance-related residual stability and freeze-thaw fatigue ratio index than the high modulus PR asphalt mixture prepared by the conventional method. Wherein the high modulus asphalt mixture prepared in example 1 has a fatigue life of more than 100 ten thousand times at 230 mu epsilon and is an excellent imported product, namely French PR.
Example 2
(1) Firstly, respectively weighing 1000g of anti-rutting master batch, 150g of Xinjiang rock asphalt, 150g of high-melt index POE VM 8780200 g, 200g of high-density polyethylene HDPE, 2g of lubricant oleamide and 3g of 2, 5-dimethyl-2, 5-di-tert-butyl hexane peroxide, putting the mixture into a high-speed stirrer for quickly stirring the mixture, and discharging the mixture after stirring for 5 min.
(2) And (2) adding the mixed material obtained in the step (1) into a feeding hopper of a double-screw extruder, extruding and granulating, wherein the inlet opening temperature is 50 ℃, the melting temperature is 260 ℃, the mouth mold temperature is 130 ℃, the rotating speed of a main engine is 300r/min, the granulating speed is 2000r/min, and underwater granulation is carried out to obtain the high-melt-index high-modulus asphalt mixture additive 2.
The application of the high-melt-index high-modulus asphalt mixture additive comprises the following steps:
s1, heating matrix asphalt to 150 ℃, weighing a certain mass of aggregate heat-releasing oven according to EME-14 gradation until the aggregate is heated to 170 ℃, wherein the aggregate proportion is as follows: 1# (10-15 mm): 2# (5 to 14 mm): 3# (3-5 mm): 4# (0 to 3 mm): the mineral powder is 32: 28: 9: 28: 3;
s2, adding the heated aggregate into a 160 ℃ mixing pot, adding the additive 2 for preparing the high-melt-index high-modulus asphalt mixture into the mixing pot, starting dry mixing for 20s, adding the heated matrix asphalt into the mixing pot, wherein the addition of the asphalt is calculated according to the oilstone ratio of 4.1%, and stirring for 180s after adding the asphalt to prepare the high-modulus asphalt mixture;
s3, placing the prepared high-modulus asphalt mixture into an oven, preserving heat for 10-20mmin, and forming a related test piece at 150 ℃ to test performance;
TABLE 2 technical indexes of high modulus additive and high modulus asphalt mixture prepared by the invention
As can be seen from table 2, the high modulus asphalt mixture prepared in example 2 has better high-temperature dynamic stability, dynamic modulus, low-temperature crack resistance, water loss resistance-related residual stability and freeze-thaw fatigue ratio index than the high modulus PR asphalt mixture prepared by the conventional method. Wherein the high modulus asphalt mixture prepared in example 2 has a fatigue life of more than 100 ten thousand times at 230 mu epsilon, and is an excellent imported product, namely French PR.
Example 3
(1) Firstly, respectively weighing 1000g of anti-rutting master batch, 200g of North American rock asphalt, 200g of high-melt index POE VM 8880150 g, 150g of high density polyethylene HDPE, 2g of lubricant erucamide and 2g of 2, 5-dimethyl-2, 5-di-tert-butyl hexane peroxide, putting the mixture into a high-speed stirrer for quickly stirring the mixture, and discharging the mixture after stirring for 5 min.
(2) And (2) adding the mixed material obtained in the step (1) into a feeding hopper of a double-screw extruder, carrying out extrusion granulation, wherein the inlet opening temperature is 70 ℃, the melting temperature is 240 ℃, the mouth mold temperature is 120 ℃, the rotating speed of a main engine is 300r/min, the granulating speed is 2500r/min, and carrying out underwater granulation to obtain the high-melt-index high-modulus asphalt mixture additive 3.
The application of the high-melt-index high-modulus asphalt mixture additive comprises the following steps:
s1, heating SBS modified asphalt to 150 ℃, weighing a certain mass of aggregate heat release oven according to EME-14 gradation until the aggregate is heated to 170 ℃, wherein the aggregate proportion is as follows: 1# (10-15 mm): 2# (5 to 14 mm): 3# (3-5 mm): 4# (0 to 3 mm): the mineral powder is 32: 28: 9: 28: 3;
s2, adding the heated aggregate into a mixing pot at 170 ℃, adding the additive 3 for preparing the high-melt-index high-modulus asphalt mixture into the mixing pot, starting dry mixing for 20s, adding the heated matrix asphalt into the mixing pot, wherein the addition of the asphalt is calculated according to the oilstone ratio of 4.2%, and stirring for 180s after adding the asphalt to prepare the high-modulus asphalt mixture;
s3, placing the prepared high-modulus asphalt mixture into an oven, preserving heat for 10-20mmin, and forming a related test piece at 150 ℃ to test performance;
comparative example 2: preparing a high-modulus asphalt mixture by adopting an imported French PR high modulus agent: SBS pitch is heated to 160 ℃, stone is heated to 180 ℃, and the aggregate mixture ratio is as follows: 1# (10-15 mm): 2# (5 to 14 mm): 3# (3 to 5 mm): 4# (0 to 3 mm): the mineral powder is 32: 28: 9: 28: 3, adding the heated stone into a 175 ℃ mixing pot, adding a prepared French PR high-modulus modifier with a certain mass into the mixing pot, stirring for 40s, adding the modified asphalt into the mixing pot, and stirring for 180s to prepare a high-modulus modified asphalt mixture; and finally, forming the prepared high-modulus mixed material at 175 ℃ and testing the performance.
TABLE 3 technical indexes of high modulus additive and high modulus asphalt mixture prepared by the invention
As can be seen from table 3, the high modulus asphalt mixture prepared in example 3 has better high-temperature dynamic stability, dynamic modulus, low-temperature crack resistance, water loss resistance-related residual stability and freeze-thaw fatigue ratio index than the performance of the PR high modulus asphalt mixture prepared by the conventional method.
Example 4
(1) Firstly, 1000g of anti-rutting master batch, 200g of Xinjiang rock asphalt, 200g of high-melt-index POE VM 8880100 g, 200g of high-density polyethylene HDPE, 1.5g of lubricant erucamide and 3g of 2, 5-dimethyl-2, 5-di-tert-butyl hexane peroxide are respectively weighed, put into a high-speed stirrer to rapidly stir the mixture, and discharged after stirring for 5 min.
(2) And (2) adding the mixed material obtained in the step (1) into a feeding hopper of a double-screw extruder, carrying out extrusion granulation, wherein the inlet temperature is 70 ℃, the melting temperature is 250 ℃, the neck mold temperature is 130 ℃, the rotating speed of a main engine is 350r/min, the granulation speed is 2200r/min, and carrying out underwater granulation to obtain the high-melt-index high-modulus asphalt mixture additive 4.
The application of the high-melt-index high-modulus asphalt mixture additive comprises the following steps:
s1, heating matrix asphalt to 160 ℃, weighing a certain mass of aggregate heat-releasing oven according to EME-14 gradation until the aggregate is heated to 170 ℃, wherein the aggregate proportion is as follows: 1# (10-15 mm): 2# (5 to 14 mm): 3# (3-5 mm): 4# (0 to 3 mm): the mineral powder is 32: 28: 9: 28: 3;
s2, adding the heated aggregate into a mixing pot at 170 ℃, adding the additive 4 for preparing the high-melt-index high-modulus asphalt mixture into the mixing pot, starting dry mixing for 20s, adding the heated matrix asphalt into the mixing pot, wherein the addition of the asphalt is calculated according to the oilstone ratio of 4.2%, and stirring for 180s after adding the asphalt to prepare the high-modulus asphalt mixture;
s3, placing the prepared high-modulus asphalt mixture into an oven, preserving heat for 10-20mmin, and forming a related test piece at 160 ℃ to test performance;
TABLE 4 technical indexes of high modulus additive and high modulus asphalt mixture prepared by the invention
As can be seen from table 4, the high modulus asphalt mixture prepared in example 4 has better high-temperature dynamic stability, dynamic modulus, low-temperature crack resistance, water loss resistance-related residual stability and freeze-thaw fatigue ratio index than the high modulus PR asphalt mixture prepared by the conventional method.
As can be seen from tables 1 to 4, the high-melt-index high-modulus asphalt mixture additives prepared in examples 1 to 4 of the invention have a large melt index of more than 80g/10min, have excellent melt dispersion performance, have blending time and blending temperature lower than those of imported French PR products in the market, and have lower void ratio, better water damage resistance and better low-temperature crack resistance.
Claims (5)
1. The high-melt-index high-modulus asphalt mixture additive comprises a high molecular polymer, asphalt, a lubricant and a catalyst, and is characterized by also comprising an anti-rutting master batch, wherein the high molecular polymer comprises high-melt-index polyolefin and high-density polyethylene; the asphalt is natural rock asphalt;
according to the weight portion, the anti-rutting agent comprises 100-200 portions of anti-rutting master batch, 10-20 portions of high-soluble polyolefin, 10-20 portions of high-density polyethylene, 10-20 portions of natural rock asphalt, 0.1-0.2 portion of lubricant and 1-6 portions of catalyst;
the anti-rutting master batch is hard asphalt particles with a softening point of more than 120 ℃, and the natural rock asphalt is North American rock asphalt or Xinjiang rock asphalt with the asphalt content of more than 95%;
the high-solubility polyolefin is one or more of VM8380, VM8780 and VM8880 of Exxon Mobil;
the lubricant is one or two of oleamide and erucamide;
the catalyst is 2, 5-dimethyl-2, 5-di-tert-butyl hexane peroxide.
2. The preparation method of the high melt index and high modulus asphalt mixture additive of claim 1, which is characterized by comprising the following steps:
(1) adding the materials of each component into a stirrer and stirring;
(2) conveying the stirred materials to a double-screw extruder for melt extrusion;
(3) granulating and forming by an underwater granulator to obtain the final product.
3. The preparation method of the high-melt-index high-modulus asphalt mixture additive as claimed in claim 2, wherein the temperature of the feed inlet of the twin-screw extruder is 50-80 ℃, and the temperature of the melting section is 160-200 ℃; the temperature of the granulation neck ring mold is 130-.
4. The application method of the high melt index and high modulus asphalt mixture additive of claim 1 is characterized by comprising the following steps:
(1) respectively heating matrix asphalt or SBS modified asphalt, stone and mineral powder;
(2) the stone, the mineral powder and the high-melt index high-modulus asphalt mixture additive are firstly dry-mixed to completely melt the additive and wrap the additive on the surface of the aggregate;
(3) adding the required matrix asphalt, stirring, mixing and forming to obtain the EME-14 high-modulus asphalt mixture.
5. The application method of the high-melt-index high-modulus asphalt mixture additive according to claim 4, wherein the high-melt-index high-modulus asphalt mixture additive accounts for 1% of the mass of the asphalt mixture.
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| CN111747674A (en) * | 2020-06-29 | 2020-10-09 | 中国地质大学（武汉） | High modulus modifier blend for asphalt mixture |
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| CN109233313A (en) * | 2018-09-26 | 2019-01-18 | 上海仁聚新材料科技有限公司 | A kind of high-modulus asphalt modifying agent, high-modulus composite modified asphalt, asphalt and preparation method thereof |
| CN109534724A (en) * | 2018-12-06 | 2019-03-29 | 江苏中路工程技术研究院有限公司 | A kind of High Modulus Asphalt Mixture and preparation method thereof modified based on high ash content rock asphalt |
| CN110684365A (en) * | 2019-10-22 | 2020-01-14 | 江苏中路交通科学技术有限公司 | Special additive for paving ultra-dense high-modulus asphalt mixture and preparation method and application method thereof |
| CN111747674A (en) * | 2020-06-29 | 2020-10-09 | 中国地质大学（武汉） | High modulus modifier blend for asphalt mixture |
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