CN116082850B - Capsule asphalt modifier and preparation method thereof - Google Patents
Capsule asphalt modifier and preparation method thereof Download PDFInfo
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- CN116082850B CN116082850B CN202211102051.6A CN202211102051A CN116082850B CN 116082850 B CN116082850 B CN 116082850B CN 202211102051 A CN202211102051 A CN 202211102051A CN 116082850 B CN116082850 B CN 116082850B
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- 239000010426 asphalt Substances 0.000 title claims abstract description 106
- 239000003607 modifier Substances 0.000 title claims abstract description 80
- 239000002775 capsule Substances 0.000 title claims abstract description 72
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 229920000642 polymer Polymers 0.000 claims abstract description 39
- 239000007788 liquid Substances 0.000 claims abstract description 34
- 238000003756 stirring Methods 0.000 claims abstract description 29
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 15
- 239000000203 mixture Substances 0.000 claims abstract description 10
- 238000005266 casting Methods 0.000 claims abstract description 9
- -1 polyethylene Polymers 0.000 claims description 17
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 16
- 239000012530 fluid Substances 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 15
- 239000004743 Polypropylene Substances 0.000 claims description 14
- 229920001155 polypropylene Polymers 0.000 claims description 14
- 230000008569 process Effects 0.000 claims description 11
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 8
- 239000001569 carbon dioxide Substances 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 7
- 239000000155 melt Substances 0.000 claims description 6
- 239000011148 porous material Substances 0.000 claims description 6
- 229920000468 styrene butadiene styrene block copolymer Polymers 0.000 claims description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 4
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 239000004698 Polyethylene Substances 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims description 3
- 229920000573 polyethylene Polymers 0.000 claims description 3
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 3
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims description 2
- 239000004850 liquid epoxy resins (LERs) Substances 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 3
- 230000009471 action Effects 0.000 abstract description 2
- 239000004568 cement Substances 0.000 abstract 1
- 238000009776 industrial production Methods 0.000 abstract 1
- 238000003860 storage Methods 0.000 abstract 1
- 239000006185 dispersion Substances 0.000 description 11
- 238000002156 mixing Methods 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
- 239000002245 particle Substances 0.000 description 7
- 238000011056 performance test Methods 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 239000012752 auxiliary agent Substances 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 239000002041 carbon nanotube Substances 0.000 description 3
- 229910021393 carbon nanotube Inorganic materials 0.000 description 3
- 239000007822 coupling agent Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 239000003822 epoxy resin Substances 0.000 description 3
- 229920000647 polyepoxide Polymers 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000005469 granulation Methods 0.000 description 2
- 230000003179 granulation Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- AZUZXOSWBOBCJY-UHFFFAOYSA-N Polyethylene, oxidized Polymers OC(=O)CCC(=O)C(C)C(O)CCCCC=O AZUZXOSWBOBCJY-UHFFFAOYSA-N 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000000635 electron micrograph Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920002959 polymer blend Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 239000003361 porogen Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/32—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof from compositions containing microballoons, e.g. syntactic foams
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0014—Use of organic additives
- C08J9/0042—Use of organic additives containing silicon
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0061—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof characterized by the use of several polymeric components
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0066—Use of inorganic compounding ingredients
- C08J9/0071—Nanosized fillers, i.e. having at least one dimension below 100 nanometers
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
- C08J9/122—Hydrogen, oxygen, CO2, nitrogen or noble gases
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08J2423/30—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers modified by chemical after-treatment by oxidation
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
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Abstract
The invention discloses a direct-casting type capsule asphalt modifier and a preparation method thereof. The capsule asphalt modifier comprises 10-50 parts by mass of polymer capsule shell and 30-90 parts by mass of liquid modifier core agent. According to the direct-casting type capsule asphalt modifier, the polymer modifier is prepared into the shell with the micropore structure by the supercritical pore-forming technology, and then the liquid modifier is packaged in the shell by capillary action, so that the problems of difficult storage and transportation of the liquid modifier, large investment in field use equipment and the like are solved. The direct-casting type capsule asphalt modifier can be directly cast into an asphalt tank or asphalt mixture on site, and the low-temperature crack resistance, room-temperature fatigue resistance and high-temperature flow resistance of asphalt can be obviously improved through simple stirring, so that the comprehensive road performance of asphalt cement is enhanced. In addition, the preparation process of the capsule asphalt modifier is simple and is convenient for industrial production.
Description
Technical Field
The invention relates to the field of road and bridge materials, in particular to an asphalt modifier and a preparation method thereof.
Background
At present, the production of more than 95% modified asphalt is mainly modified by a factory wet method, and solid polymer, liquid rubber oil and other modifiers are added into a large colloid mill, and the modified asphalt finished product is obtained through high-speed shearing, dispersing and developing and then is stored in a factory asphalt tank. When the asphalt is used in a construction site, the asphalt is transferred to a site asphalt tank through a special asphalt transport vehicle, and the wet modified asphalt has the advantages of complex process, large equipment investment and high energy consumption, and does not meet the development target of current green low carbon. The direct-casting asphalt modifier solves the problems of high energy consumption and the like in the wet-process modified asphalt production process, realizes on-site modification, greatly improves engineering efficiency, reduces engineering cost and reduces carbon dioxide emission.
At present, the direct-casting modifier is prepared by melt blending SBS and other polymers with additives. However, there are two problems associated with melt blending processes to produce asphalt modifiers. Firstly, the content of the liquid modifier component in the modifier cannot be too high, otherwise, the liquid modifier cannot be molded, and in addition, the liquid modifier is lost in the high-temperature processing process, so that the final proportioning is invalid. Therefore, in practical application, it is often difficult to meet the index of modified asphalt, and it is also necessary to add additives such as rubber oil or select matrix asphalt with specific grades for modification. Secondly, the asphalt modifier prepared by the melt blending process has poor compatibility and quick solubility in asphalt, and still needs high-speed shearing to realize dispersion. At present, although patent (CN 114163830A) has been proposed, in which a large amount of plasticizer is added to locally swell a polymer such as SBS, the purpose of rapid melting is achieved at a high temperature. However, the polymer modifier and the asphalt phase are greatly different in polarity, and although polymer particles swelled at high temperature can be melted rapidly, even dispersion of the modifier in the asphalt phase is difficult to achieve by simple stirring, and the modifier is still distributed in the asphalt phase in a massive melt. Therefore, the current dry-process modified asphalt process using the direct-injection asphalt modifier cannot completely replace the wet-process modified process, so that the direct-injection asphalt modifier with the comparable wet-process modified effect is needed to be prepared.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the existing direct-casting asphalt modifier is prepared from polymers such as SBS and the like and auxiliary agents in a melt blending mode, and the problems of high-temperature processing loss and poor dispersibility of the modifier can occur.
The invention firstly prepares the polymer modifier into a microporous capsule shell through a supercritical fluid pore technology, and then encapsulates the liquid modifier into a capsule through capillary action to prepare the solid-liquid integrated capsule asphalt modifier. The capsule asphalt modifier can quickly adsorb asphalt into the pore canal due to the porous structure of the capsule asphalt modifier, and the uniform dispersion of the modifier phase is realized in the simple stirring process.
The direct-casting type capsule asphalt modifier comprises 10-50 parts by mass of a polymer capsule shell and 30-90 parts by mass of a liquid core agent; and the liquid core is contained in the polymer capsule shell; the polymer capsule shell is porous, has a porosity of more than 90% and a pore size of 0.05-500 μm.
The polymer capsule shell is prepared by adopting a supercritical fluid pore-forming process.
The preparation process of the polymer capsule shell comprises the following steps:
s1, heating a polymer to a molten state;
s2, heating and pressurizing the pore-forming agent to a supercritical fluid state, then injecting the pore-forming agent into a polymer melt according to a certain mass ratio, and uniformly stirring to obtain a melt blend;
S3, cooling the melt blend to room temperature to obtain the polymer capsule shell.
The polymer comprises one or more than two of polyethylene, polypropylene, oxidized polyethylene, oxidized polypropylene, SBS, SBR, EVA, POE and polyolefin wax.
The pore-forming agent comprises any one of carbon dioxide, nitrogen, ethanol and water.
The mass ratio of the pore-forming agent to the polymer melt is 0.003% -2%.
The capsule core agent comprises any one of liquid asphalt, liquid epoxy resin, liquid acrylic resin, solvent oil, liquid antioxidant, coupling agent and modifier dispersion liquid.
The modifier dispersion liquid comprises any one of carbon nano tube dispersion liquid, polyester fiber dispersion liquid and calcium carbonate whisker dispersion liquid.
A preparation method of a direct-casting type capsule asphalt modifier comprises the following steps:
S1, adding a liquid core agent into a polymer capsule shell according to a certain proportion to obtain a mixture;
s2, stirring the mixture in the step S1 at the room temperature at the speed of 10-200rpm for 10-200min;
s3, stirring to obtain a finished product of the capsule asphalt modifier.
Advantageous effects
1. The liquid modifier is encapsulated by the microporous shell, so that the process is simple, high-temperature processing is not needed, and the loss of the liquid modifier at high temperature processing is avoided, so that the formula proportion is invalid. The solid-liquid integrated capsule asphalt modifier can be directly put into an asphalt tank or a mixing tower, asphalt can be modified through simple stirring, no additional equipment is needed, and the use is convenient.
2. The capsule asphalt modifier has developed void structure and superhigh specific surface area, and can carry a certain amount of gas, and the gas volatilizes when being put into molten asphalt, so that the asphalt is foamed, the asphalt viscosity is reduced, the warm mixing effect is realized, and the energy consumption is reduced.
3. The capsule asphalt modifier is put into the molten asphalt, and due to the driving of concentration difference, the liquid asphalt can be rapidly diffused into an asphalt phase, meanwhile, the liquid asphalt can be rapidly adsorbed into a capsule shell, the asphalt and the modifier are initially mixed, then, the ultrathin pore wall of the capsule can be rapidly melted in the hot asphalt, and the capsule asphalt can be uniformly dispersed in the asphalt phase through simple stirring, so that the modification purpose is realized, and the modification efficiency is greatly improved.
Drawings
FIG. 1 is a photograph of a capsule shell of example 1;
FIG. 2 is an electron micrograph of the capsule shell;
FIG. 3 capsule asphalt modifier preparation process;
FIG. 4 is a photograph of a capsule asphalt modifier;
FIG. 5 photographs of a capsule asphalt modifier after addition to asphalt;
FIG. 6 is a photograph of the morphology of the modifier prepared in comparative example 1;
FIG. 7 is a photograph of the modifier of comparative example 1 added to asphalt;
FIG. 8 photo of modifier State in comparative example 2
Detailed Description
The oxidized polyethylene used in the examples was NV-610P of the new material of Keminox, polypropylene was medium petroleum 1100N, SBS was 1501 of Li Changrong, SBR was QY52 of bright, EVA was 460 of DuPont, POE was 8003 of Dow chemical,
The porogens used in the examples were nitrogen and carbon dioxide from air liquefaction company.
The liquid core used in the examples was NPEL epoxy resin from south Asia, KN4006 oil from Xinjiang Kalamaiyi, carbon nanotube dispersion from Shenzhen one technology, KH-560 coupling agent from Hangzhou Jersey chemical.
The 90# road petroleum asphalt used in the examples is the medium petrochemical east China sea brand, and the 70# asphalt is Sichuan Hongyang.
Example 1
Heating 2KgSBS and 2kg polypropylene to 200deg.C, maintaining molten state, stirring, simultaneously heating 5g carbon dioxide to 60deg.C, pressurizing to 9MPa to form supercritical fluid, injecting into polypropylene melt, stirring, and cooling to obtain microporous capsule shell, wherein SEM photograph is shown in figure 1;
Uniformly stirring 1kg of microporous capsule shell and 1kg of epoxy resin to obtain a granular capsule asphalt modifier;
140g of the capsule asphalt modifier is added into 860g of 70# asphalt with the temperature of 170 ℃ and then stirred for 30min at the speed of 100rpm, thus obtaining the modified asphalt.
Specific performance tests are shown below.
Example 2
Heating 2kgSBR and 2kg of oxidized polypropylene to 180 ℃, keeping a molten state, uniformly stirring, simultaneously heating 10g of nitrogen to 60 ℃, pressurizing to 7MPa to form fluid in a supercritical state, injecting the fluid into a polymer melt, uniformly stirring, and then cooling to obtain a microporous capsule shell;
uniformly stirring 1kg of microporous capsule shell and 6kg of KN4006 oil to obtain a granular capsule asphalt modifier;
140g of the capsule asphalt modifier is added into 860g of 70# asphalt with the temperature of 170 ℃ and then stirred for 30min at the speed of 100rpm, thus obtaining the modified asphalt.
Specific performance tests are shown below.
Example 3
Heating 3kgEVA to 200 ℃, keeping a molten state, uniformly stirring, simultaneously heating 50g of carbon dioxide to 60 ℃, pressurizing to 9MPa to form fluid in a supercritical state, injecting the fluid into a polymer melt, uniformly stirring, and then cooling to obtain a microporous capsule shell;
Uniformly stirring 1kg of microporous capsule shell and 0.6kg of carbon nano tube dispersion liquid to obtain a granular capsule asphalt modifier;
140g of the capsule asphalt modifier is added into 860g of 70# asphalt with the temperature of 170 ℃ and then stirred for 30min at the speed of 100rpm, thus obtaining the modified asphalt.
Specific performance tests are shown below.
Example 4
Heating 2kgPOE kg of polypropylene and 0.5kg of polypropylene to 200 ℃, keeping a molten state, uniformly stirring, simultaneously heating 20g of carbon dioxide to 60 ℃, pressurizing to 9MPa to form fluid in a supercritical state, injecting the fluid into a polymer melt, uniformly stirring, and then cooling to obtain a microporous capsule shell;
Uniformly stirring 1kg of microporous capsule shell and 0.8kg of KH560 coupling agent fat to obtain a granular capsule asphalt modifier;
140g of the capsule asphalt modifier is added into 860g of 90# asphalt with the temperature of 170 ℃ and then stirred for 30min at the speed of 100rpm, thus obtaining the modified asphalt.
Specific performance tests are shown below.
Example 5
Heating 1kgSBS kg of polypropylene, 0.5kg of polypropylene and 0.5kg of kgEVA to 200 ℃, keeping a molten state, uniformly stirring, simultaneously heating 35g of carbon dioxide to 60 ℃, pressurizing to 9MPa to form supercritical fluid, injecting the supercritical fluid into a polypropylene melt, uniformly stirring, and cooling to obtain a microporous capsule shell;
uniformly stirring 1kg of microporous capsule shell and 1.5kg of KN4006 oil to obtain a granular capsule asphalt modifier;
140g of the capsule asphalt modifier is added into 860g of 90# asphalt with the temperature of 170 ℃ and then stirred for 30min at the speed of 100rpm, thus obtaining the modified asphalt.
Specific performance tests are shown below.
Comparative example 1
The protocol for direct melt mixing is as follows:
Heating 2KgSBS and 2kg of polypropylene to 200 ℃, keeping a molten state, uniformly stirring, and then cooling to obtain polymer blend particles;
uniformly stirring 1kg of polymer particles and 1kg of epoxy resin to obtain an asphalt modifier;
140g of the modifier is added into 860g of 70# asphalt with the temperature of 170 ℃ and then stirred for 30min at the speed of 100rpm, thus obtaining the modified asphalt.
The overall morphology of the obtained modifier is a two-phase mixture of plastic particles and liquid auxiliary agent, as shown in figure 6
When the modifier prepared in the comparative example 1 is added into asphalt, the modifier is difficult to melt, particles float on the surface of the asphalt, and a photo of the obtained modified asphalt is shown as 7, so that the poor indissolvable dispersibility of the modifier in the asphalt can be seen, and the obvious difference from fig. 5 exists.
Specific test comparative properties are as follows
The polymer melt is not subjected to supercritical fluid pore-forming, and the particle inside of the polymer melt has no pore structure and cannot adsorb liquid auxiliary agents. In addition, when the polymer particles of non-porous structure are added to asphalt, it is difficult to melt rapidly, forming a homogeneous phase with asphalt. The porous structure of the capsule carrier increases the contact surface of asphalt and polymer, so that the asphalt can enter the capsule rapidly and then melt into homogeneous phase.
Comparative example 2
The modifier is prepared by the traditional blending granulation mode as follows:
uniformly stirring 2kgSBR kg of oxidized polypropylene and 2kg of 24kgKN4006 oil, and then extruding and granulating by a screw extruder to obtain the modifier.
140G of the capsule asphalt modifier is added into 860g of 70# asphalt with the temperature of 170 ℃ and then stirred for 30min at the speed of 100rpm, thus obtaining the modified asphalt.
Specific test comparative properties are as follows
The modifier formula with higher liquid auxiliary agent content is difficult to prepare by adopting the traditional blending granulation process, the prepared modifier with high liquid content formula cannot be molded, and various properties of the modified asphalt are slightly poorer although the modifier can be quickly melted when the modifier is added into asphalt, so that the dispersion uniformity of the amorphous colloidal modifier is poorer than that of the capsule modifier.
Claims (1)
1. The application of the direct-injection type capsule asphalt modifier in preparing modified asphalt which can quickly enter the capsule and then be melted into homogeneous phase is characterized in that the direct-injection type capsule asphalt modifier comprises 10-50 parts by mass of polymer capsule shell and 30-90 parts by mass of liquid core agent; and the liquid core is contained in the polymer capsule shell; the polymer capsule shell is porous, the porosity is more than 90%, and the pore diameter is 0.05-500 mu m;
The polymer capsule shell is prepared by adopting a supercritical fluid pore-forming process;
The preparation process of the polymer capsule shell comprises the following steps: s1, heating a polymer to a molten state; s2, heating and pressurizing the pore-forming agent to a supercritical fluid state, then injecting the pore-forming agent into a polymer melt according to a certain mass ratio, and uniformly stirring to obtain a melt blend; s3, cooling the melt blend to room temperature to obtain a polymer capsule shell;
The polymer comprises one or more than two of oxidized polyethylene, polypropylene and SBS, SBR, EVA, POE;
the pore-forming agent comprises any one of carbon dioxide, nitrogen, ethanol and water;
The mass ratio of the pore-forming agent to the polymer melt is 0.003-2%;
the capsule core agent comprises liquid epoxy resin;
the preparation method of the direct-casting type capsule asphalt modifier comprises the following steps:
S1, adding a liquid core agent into a polymer capsule shell according to a certain proportion to obtain a mixture; s2, stirring the mixture in the step S1 at the room temperature at the speed of 10-200rpm for 10-200min; s3, stirring to obtain a finished product of the capsule asphalt modifier.
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| JP2001049081A (en) * | 1999-08-10 | 2001-02-20 | Daicel Chem Ind Ltd | Asphalt-reforming material and reformed asphalt composition |
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| US20080230935A1 (en) * | 2006-08-01 | 2008-09-25 | Kennel Elliot B | Methods for producing a pitch foam |
| WO2009017262A1 (en) * | 2007-07-27 | 2009-02-05 | Korea Kumho Petrochemical Co., Ltd. | Foaming asphalt modifier |
| CN106046821B (en) * | 2016-08-16 | 2018-07-13 | 东莞泰和沥青产品有限公司 | A kind of foaming modification bituminous composition |
| CN109735122B (en) * | 2018-12-11 | 2021-06-29 | 清华大学深圳研究生院 | Enhanced asphalt regenerant and preparation method thereof |
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| CN1948398A (en) * | 2005-10-11 | 2007-04-18 | 锦湖石油化学株式会社 | Foam asphalt modifier for road surface and method for making same |
| CN1861368A (en) * | 2006-06-09 | 2006-11-15 | 北京化工大学 | Method for producing non-cross-linking PP foam material |
| CN110028800A (en) * | 2019-03-21 | 2019-07-19 | 华南理工大学 | A kind of miscible method of rubber asphalt of the drag reducer of viscosity reduction containing liquid |
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