CN114015249A - Modified asphalt and preparation method thereof - Google Patents
Modified asphalt and preparation method thereof Download PDFInfo
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- CN114015249A CN114015249A CN202111308220.7A CN202111308220A CN114015249A CN 114015249 A CN114015249 A CN 114015249A CN 202111308220 A CN202111308220 A CN 202111308220A CN 114015249 A CN114015249 A CN 114015249A
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- 239000010426 asphalt Substances 0.000 title claims abstract description 98
- 238000002360 preparation method Methods 0.000 title abstract description 9
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 62
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 59
- 239000000284 extract Substances 0.000 claims abstract description 39
- 230000002745 absorbent Effects 0.000 claims abstract description 35
- 239000002250 absorbent Substances 0.000 claims abstract description 35
- 239000004568 cement Substances 0.000 claims abstract description 33
- 239000003094 microcapsule Substances 0.000 claims abstract description 32
- 229940114496 olive leaf extract Drugs 0.000 claims abstract description 30
- 239000001856 Ethyl cellulose Substances 0.000 claims abstract description 27
- ZZSNKZQZMQGXPY-UHFFFAOYSA-N Ethyl cellulose Chemical compound CCOCC1OC(OC)C(OCC)C(OCC)C1OC1C(O)C(O)C(OC)C(CO)O1 ZZSNKZQZMQGXPY-UHFFFAOYSA-N 0.000 claims abstract description 27
- 229920001249 ethyl cellulose Polymers 0.000 claims abstract description 27
- 235000019325 ethyl cellulose Nutrition 0.000 claims abstract description 27
- 244000086363 Pterocarpus indicus Species 0.000 claims abstract description 24
- 235000009984 Pterocarpus indicus Nutrition 0.000 claims abstract description 24
- 239000003381 stabilizer Substances 0.000 claims abstract description 23
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000011159 matrix material Substances 0.000 claims abstract description 21
- 239000008157 edible vegetable oil Substances 0.000 claims abstract description 20
- 238000003756 stirring Methods 0.000 claims description 61
- 235000006708 antioxidants Nutrition 0.000 claims description 56
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 claims description 15
- 239000006185 dispersion Substances 0.000 claims description 15
- 229930182470 glycoside Natural products 0.000 claims description 15
- 150000002338 glycosides Chemical class 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 13
- 239000002002 slurry Substances 0.000 claims description 13
- DOUMFZQKYFQNTF-WUTVXBCWSA-N (R)-rosmarinic acid Chemical compound C([C@H](C(=O)O)OC(=O)\C=C\C=1C=C(O)C(O)=CC=1)C1=CC=C(O)C(O)=C1 DOUMFZQKYFQNTF-WUTVXBCWSA-N 0.000 claims description 12
- QRYRORQUOLYVBU-VBKZILBWSA-N carnosic acid Chemical compound CC([C@@H]1CC2)(C)CCC[C@]1(C(O)=O)C1=C2C=C(C(C)C)C(O)=C1O QRYRORQUOLYVBU-VBKZILBWSA-N 0.000 claims description 12
- 239000004611 light stabiliser Substances 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 10
- ZQBAKBUEJOMQEX-UHFFFAOYSA-N phenyl salicylate Chemical compound OC1=CC=CC=C1C(=O)OC1=CC=CC=C1 ZQBAKBUEJOMQEX-UHFFFAOYSA-N 0.000 claims description 10
- 238000001694 spray drying Methods 0.000 claims description 10
- DOUMFZQKYFQNTF-MRXNPFEDSA-N rosemarinic acid Natural products C([C@H](C(=O)O)OC(=O)C=CC=1C=C(O)C(O)=CC=1)C1=CC=C(O)C(O)=C1 DOUMFZQKYFQNTF-MRXNPFEDSA-N 0.000 claims description 9
- WCGUUGGRBIKTOS-GPOJBZKASA-N (3beta)-3-hydroxyurs-12-en-28-oic acid Chemical compound C1C[C@H](O)C(C)(C)[C@@H]2CC[C@@]3(C)[C@]4(C)CC[C@@]5(C(O)=O)CC[C@@H](C)[C@H](C)[C@H]5C4=CC[C@@H]3[C@]21C WCGUUGGRBIKTOS-GPOJBZKASA-N 0.000 claims description 6
- ZZAFFYPNLYCDEP-HNNXBMFYSA-N Rosmarinsaeure Natural products OC(=O)[C@H](Cc1cccc(O)c1O)OC(=O)C=Cc2ccc(O)c(O)c2 ZZAFFYPNLYCDEP-HNNXBMFYSA-N 0.000 claims description 6
- TVHVQJFBWRLYOD-UHFFFAOYSA-N rosmarinic acid Natural products OC(=O)C(Cc1ccc(O)c(O)c1)OC(=Cc2ccc(O)c(O)c2)C=O TVHVQJFBWRLYOD-UHFFFAOYSA-N 0.000 claims description 6
- PLSAJKYPRJGMHO-UHFFFAOYSA-N ursolic acid Natural products CC1CCC2(CCC3(C)C(C=CC4C5(C)CCC(O)C(C)(C)C5CCC34C)C2C1C)C(=O)O PLSAJKYPRJGMHO-UHFFFAOYSA-N 0.000 claims description 6
- 229940096998 ursolic acid Drugs 0.000 claims description 6
- UFJORDZSBNSRQT-UHFFFAOYSA-N 3-(4-oxo-2-phenylchromen-3-yl)-2-phenylchromen-4-one Chemical compound O1C2=CC=CC=C2C(=O)C(C=2C(C3=CC=CC=C3OC=2C=2C=CC=CC=2)=O)=C1C1=CC=CC=C1 UFJORDZSBNSRQT-UHFFFAOYSA-N 0.000 claims description 5
- GAMYVSCDDLXAQW-AOIWZFSPSA-N Thermopsosid Natural products O(C)c1c(O)ccc(C=2Oc3c(c(O)cc(O[C@H]4[C@H](O)[C@@H](O)[C@H](O)[C@H](CO)O4)c3)C(=O)C=2)c1 GAMYVSCDDLXAQW-AOIWZFSPSA-N 0.000 claims description 5
- 239000010775 animal oil Substances 0.000 claims description 5
- MCPKSFINULVDNX-UHFFFAOYSA-N drometrizole Chemical compound CC1=CC=C(O)C(N2N=C3C=CC=CC3=N2)=C1 MCPKSFINULVDNX-UHFFFAOYSA-N 0.000 claims description 5
- 239000000839 emulsion Substances 0.000 claims description 5
- 229930003944 flavone Natural products 0.000 claims description 5
- 150000002212 flavone derivatives Chemical class 0.000 claims description 5
- 235000011949 flavones Nutrition 0.000 claims description 5
- 229960000969 phenyl salicylate Drugs 0.000 claims description 5
- 235000018553 tannin Nutrition 0.000 claims description 5
- 229920001864 tannin Polymers 0.000 claims description 5
- 239000001648 tannin Substances 0.000 claims description 5
- 235000015112 vegetable and seed oil Nutrition 0.000 claims description 5
- 239000008158 vegetable oil Substances 0.000 claims description 5
- VHBFFQKBGNRLFZ-UHFFFAOYSA-N vitamin p Natural products O1C2=CC=CC=C2C(=O)C=C1C1=CC=CC=C1 VHBFFQKBGNRLFZ-UHFFFAOYSA-N 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 claims 5
- 230000003712 anti-aging effect Effects 0.000 abstract description 6
- 230000007774 longterm Effects 0.000 abstract description 4
- 235000020748 rosemary extract Nutrition 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000002775 capsule Substances 0.000 abstract 2
- 238000013268 sustained release Methods 0.000 abstract 1
- 239000012730 sustained-release form Substances 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 12
- 239000010408 film Substances 0.000 description 10
- 230000035515 penetration Effects 0.000 description 10
- 230000032683 aging Effects 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 9
- 239000011398 Portland cement Substances 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 230000003679 aging effect Effects 0.000 description 3
- 239000011384 asphalt concrete Substances 0.000 description 3
- 229920002678 cellulose Polymers 0.000 description 3
- 239000001913 cellulose Substances 0.000 description 3
- 238000007865 diluting Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- DOUMFZQKYFQNTF-ZZXKWVIFSA-N rosmarinic acid Chemical compound C=1C=C(O)C(O)=CC=1/C=C/C(=O)OC(C(=O)O)CC1=CC=C(O)C(O)=C1 DOUMFZQKYFQNTF-ZZXKWVIFSA-N 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000000654 additive Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 230000009965 odorless effect Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 235000019198 oils Nutrition 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
Abstract
The invention discloses modified asphalt and a preparation method thereof, and the modified asphalt comprises the following components in parts by mass: 85-95 parts of matrix asphalt, 0-0.5 part of hindered phenol antioxidant, 0-0.5 part of ultraviolet absorbent, 1-2 parts of rosewood extract, 1-2 parts of olive leaf extract, 1-2 parts of cement, 1-2 parts of ethyl cellulose, 0.5-1.5 parts of stabilizer and 3-5 parts of edible oil. The cement, ethyl cellulose, rosewood extract and olive leaf extract are used for generating a sustained-release antioxidant microcapsule, wherein the cement and the ethyl cellulose are used as capsule walls, and the rosewood extract and the olive leaf extract are used as capsule cores. The hindered phenol antioxidant, ultraviolet absorbent, rosmarinus officinalis extract and olive leaf extract have anti-aging effect, and can improve the anti-aging performance of asphalt. The slow-release antioxidant microcapsule can prolong the action time of the antioxidant and is beneficial to the long-term efficacy of the antioxidant.
Description
Technical Field
The invention relates to the technical field of highway engineering, in particular to modified asphalt and a preparation method thereof.
Background
Asphalt is one of the basic materials constituting asphalt concrete, and has an important influence on the properties of asphalt concrete and asphalt pavement. The asphalt is a mixture containing various macromolecular organic matters and is black elastic solid at normal temperature and low temperature; asphalt softens and even becomes fluid at high temperatures.
Asphalt is in direct contact with oxygen and sunlight from the beginning of production, and asphalt concrete is also affected by rain and load after being laid on a road surface. Under the influence of load, heat, oxygen, rainwater, ultraviolet rays and other media, the asphalt can generate a series of physical and chemical reactions, and macroscopically shows that the light oil content in the asphalt is reduced, the appearance is hardened and embrittled, the penetration is reduced, and the softening point is increased. The asphalt aging can generate bad influence on the service life of the asphalt pavement, induce and promote the generation and development of road cracks, and also can aggravate the development of diseases such as pavement pits, water damage and the like.
Hindered phenol antioxidants are a commonly used class of high-potency antioxidants. The ultraviolet absorbent is a light stabilizer, has good thermal stability and chemical stability, and is colorless, nontoxic and odorless. The main components of the rosemarinic acid extract are rosmarinic acid, carnosic acid and ursolic acid, and the rosemarinic acid extract has the characteristics of high oxidation resistance, good thermal stability, low production cost, nature, no toxicity and the like, and avoids toxic and side effects on human bodies. The olive leaf extract has good chemical stability, insulativity and good hydrophobic property. The edible oil has the main function of diluting the modified asphalt.
There are some technologies to improve the anti-aging performance of asphalt by adding various antioxidants or ultraviolet absorbers to asphalt, but the effect of the additives on the environment is very rapid, that is, the additives improve the anti-aging performance of asphalt only in a short period of time, and the antioxidants do not have obvious effect on the improvement of the long-term aging of asphalt. There is a great need to develop a slow-release antioxidant to improve the long-term aging properties of asphalt.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides modified asphalt and a preparation method thereof, and the prepared modified asphalt has good ageing resistance and solves the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: the modified asphalt comprises the following components in parts by weight: 85-95 parts of matrix asphalt, 0-0.5 part of hindered phenol antioxidant, 0-0.5 part of ultraviolet absorbent, 1-2 parts of rosewood extract, 1-2 parts of olive leaf extract, 1-2 parts of cement, 1-2 parts of ethyl cellulose, 0.5-1.5 parts of stabilizer and 3-5 parts of edible oil.
Preferably, the components are as follows by mass: 85-90 parts of matrix asphalt, 0-0.5 part of hindered phenol antioxidant, 0-0.5 part of ultraviolet absorbent, 1-2 parts of rosewood extract, 1-2 parts of olive leaf extract, 1-2 parts of cement, 1-2 parts of ethyl cellulose, 0.5-1.5 parts of stabilizer and 3-5 parts of edible oil.
Preferably, the rosemarinic acid extract mainly comprises rosmarinic acid, carnosic acid and ursolic acid; the main components of the olive leaf extract are secoiridoid and glycoside thereof, flavone and glycoside thereof, biflavone and glycoside thereof and low molecular tannin.
Preferably, the ultraviolet absorbent is one or more of phenyl salicylate, ultraviolet absorbent UV-P, ultraviolet absorbent UV-O, ultraviolet absorbent UV-531 and ultraviolet absorbent UV-327; the stabilizer is one or more of light stabilizer GW-540, light stabilizer 744 and stabilizer HPT.
Preferably, the effective component of the hindered phenol antioxidant is more than or equal to 98 percent, and the fineness is not less than 200 meshes; the edible oil is one or more of vegetable oil and animal oil.
Preferably, the cement is ordinary portland cement, grade 42.5.
Preferably, the ethylcellulose is an analytically pure white powder.
In addition, the invention also provides another technical scheme, and the preparation method of the modified asphalt comprises the following steps:
s1, preparing a cement slurry solution with the concentration of 5%, slowly adding the rosewood extract and the olive leaf extract into the cement slurry, fully stirring, and carrying out spray drying on the dispersion to obtain a cement-extract antioxidant microcapsule A;
s2, fully dispersing ethyl cellulose in dichloromethane, adding the cement-extract antioxidant microcapsule A, fully stirring to uniformly disperse the cement-extract antioxidant microcapsule A in ethyl cellulose emulsion to obtain dispersion liquid B; spray drying the dispersion liquid B to obtain a slow-release antioxidant microcapsule C;
s3, heating the matrix asphalt to 140-150 ℃, adding edible oil, and stirring in a stirring container to obtain modified asphalt MA;
s4, keeping the temperature of the modified asphalt MA at 140-150 ℃, adding the slow-release antioxidant microcapsule C and the stabilizer, and stirring in a stirring container to obtain modified asphalt MB;
and S5, keeping the temperature of the modified asphalt MB at 140-150 ℃, adding the hindered phenol antioxidant and the ultraviolet absorbent, and stirring in a stirring container to obtain the final modified asphalt.
Preferably, the fully stirring in step S1 and step S2 is specifically: the stirring speed is 800r/min, and the stirring time is 1 h.
Preferably, the slow-release antioxidant microcapsule C in step S2 is: the outermost layer is ethyl cellulose, the middle layer is cement paste, and the inner layer is a slow-release antioxidant microcapsule C of a rosewood extract and an olive leaf extract.
Preferably, the stirring in the step S3 is performed for 120 to 180 seconds at a stirring speed of 300 to 500 r/min.
Preferably, the stirring in the step S4 and the step S5 is carried out for 300 to 600 seconds at a stirring speed of 300 to 500 r/min.
The invention has the beneficial effects that: the invention can provide asphalt with good aging resistance, the olive leaf extract and the rosewood extract are natural, have wide sources and are easy to extract, the olive leaf extract, the rosewood extract, cement and ethyl cellulose jointly generate a slow-release antioxidant microcapsule, the long-term aging performance of the asphalt can be effectively improved through the slow release of the antioxidant, the edible oil is compatible with the asphalt, can improve the flow property of the matrix asphalt, the hindered phenol antioxidant is an organic antioxidant which has good compatibility with the asphalt and can also enhance the antioxidant property of the asphalt, the olive leaf extract and the rosewood extract contain substances with natural antioxidant components, the anti-aging performance of the asphalt can be improved, and the ultraviolet absorbent can effectively absorb ultraviolet rays, so that the aging effect of the ultraviolet rays on the asphalt is relieved.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to 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 derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The modified asphalt comprises the following components in parts by mass: 89 parts of matrix asphalt, 0.2 part of hindered phenol antioxidant, 1.5 parts of rosewood extract, 1.5 parts of olive leaf extract, 2 parts of cement, 2 parts of B-grade cellulose, 0.5 part of stabilizer and 3.3 parts of edible oil.
The main components of the rosewood extract are rosmarinic acid, carnosic acid and ursolic acid; the main components of the olive leaf extract are secoiridoid and glycoside thereof, flavone and glycoside thereof, biflavone and glycoside thereof and low molecular tannin.
The ultraviolet absorbent is one or more of phenyl salicylate, ultraviolet absorbent UV-P, ultraviolet absorbent UV-O, ultraviolet absorbent UV-531 and ultraviolet absorbent UV-327; the stabilizer is one or more of light stabilizer GW-540, light stabilizer 744 and stabilizer HPT.
The effective component of the hindered phenol antioxidant is more than or equal to 98 percent, and the fineness is not less than 200 meshes; the edible oil is one or more of vegetable oil and animal oil.
The cement is ordinary portland cement with a grade of 42.5.
Ethylcellulose is an analytically pure white powder.
The preparation method of the modified asphalt comprises the following steps:
step one, preparing 1000ml of 5% cement slurry solution, slowly adding the rosmarinus officinalis extract and the olive leaf extract into the cement slurry, fully stirring for 1 hour at the speed of 800r/min, and performing spray drying on the dispersion to obtain an antioxidant microcapsule A taking the cement slurry as a matrix;
step two, fully dispersing ethyl cellulose in dichloromethane, adding a cement-extract antioxidant microcapsule, fully stirring at 800r/min for 1 hour to uniformly disperse the cement-extract antioxidant microcapsule in ethyl cellulose emulsion to obtain dispersion liquid B; and (3) carrying out spray drying on the dispersion liquid B to obtain the slow-release antioxidant microcapsule C with the outermost layer of ethyl cellulose, the middle layer of cement paste and the inner layer of rosewood extract and olive leaf extract.
Heating the matrix asphalt to 140 ℃, adding edible oil, and stirring in a stirring pot for 120 seconds to obtain modified asphalt MA, wherein the stirring speed is 300r/min, and the matrix asphalt can be diluted in the step;
step four, keeping the temperature of the modified asphalt MA at 140 ℃, adding the slow-release antioxidant microcapsule C and the stabilizer, and stirring in a stirring pot for 300 seconds to obtain modified asphalt MB, wherein the stirring speed is 300r/min, and the modified asphalt with relatively stable performance can be obtained in the step;
and step five, keeping the temperature of the modified asphalt MB at 140 ℃, adding the hindered phenol antioxidant and the ultraviolet absorbent, and stirring for 300 seconds at the stirring speed of 300r/min to obtain the final modified asphalt.
Example 2
The modified asphalt comprises the following components in parts by mass: : 88 parts of matrix asphalt, 0.3 part of hindered phenol antioxidant, 0.2 part of ultraviolet absorbent, 1 part of rosewood extract, 1 part of olive leaf extract, 2 parts of cement, 2 parts of secondary cellulose, 1 part of stabilizer and 4.5 parts of edible oil.
The main components of the rosewood extract are rosmarinic acid, carnosic acid and ursolic acid; the main components of the olive leaf extract are secoiridoid and glycoside thereof, flavone and glycoside thereof, biflavone and glycoside thereof and low molecular tannin.
The ultraviolet absorbent is one or more of phenyl salicylate, ultraviolet absorbent UV-P, ultraviolet absorbent UV-O, ultraviolet absorbent UV-531 and ultraviolet absorbent UV-327; the stabilizer is one or more of light stabilizer GW-540, light stabilizer 744 and stabilizer HPT.
The effective component of the hindered phenol antioxidant is more than or equal to 98 percent, and the fineness is not less than 200 meshes; the edible oil is one or more of vegetable oil and animal oil.
The cement is ordinary portland cement with a grade of 42.5.
Ethylcellulose is an analytically pure white powder.
The preparation method of the modified asphalt comprises the following steps:
step one, preparing 1000ml of 5% cement slurry solution, slowly adding the rosmarinus officinalis extract and the olive leaf extract into the cement slurry, fully stirring for 1 hour at the speed of 800r/min, and performing spray drying on the dispersion to obtain an antioxidant microcapsule A taking the cement slurry as a matrix;
step two, fully dispersing ethyl cellulose in dichloromethane, adding a cement-extract antioxidant microcapsule, fully stirring at 800r/min for 1 hour to uniformly disperse the cement-extract antioxidant microcapsule in ethyl cellulose emulsion to obtain dispersion liquid B; and (3) carrying out spray drying on the dispersion liquid B to obtain the slow-release antioxidant microcapsule C with the outermost layer of ethyl cellulose, the middle layer of cement paste and the inner layer of rosewood extract and olive leaf extract.
Step three, heating the matrix asphalt to 150 ℃, adding edible oil, and stirring in a stirring pot for 180 seconds to obtain modified asphalt MA, wherein the stirring speed is 500r/min, and the step can be used for diluting the matrix asphalt;
step four, keeping the temperature of the modified asphalt MA at 150 ℃, adding the slow-release antioxidant microcapsule C and the stabilizer, and stirring in a stirring pot for 600 seconds to obtain modified asphalt MB, wherein the stirring speed is 500r/min, and the modified asphalt with relatively stable performance can be obtained in the step;
and step five, keeping the temperature of the modified asphalt MB at 150 ℃, adding the hindered phenol antioxidant and the ultraviolet absorbent, and stirring for 600 seconds at a stirring speed of 500r/min to obtain the final modified asphalt.
Example 3
The modified asphalt comprises the following components in parts by mass: 87 parts of matrix asphalt, 0.5 part of hindered phenol antioxidant, 0.5 part of ultraviolet absorbent, 1 part of rosewood extract, 1 part of olive leaf extract, 1 part of cement, 2 parts of B-grade cellulose, 1 part of stabilizer and 5 parts of edible oil.
The main components of the rosewood extract are rosmarinic acid, carnosic acid and ursolic acid; the main components of the olive leaf extract are secoiridoid and glycoside thereof, flavone and glycoside thereof, biflavone and glycoside thereof and low molecular tannin.
The ultraviolet absorbent is one or more of phenyl salicylate, ultraviolet absorbent UV-P, ultraviolet absorbent UV-O, ultraviolet absorbent UV-531 and ultraviolet absorbent UV-327; the stabilizer is one or more of light stabilizer GW-540, light stabilizer 744 and stabilizer HPT.
The effective component of the hindered phenol antioxidant is more than or equal to 98 percent, and the fineness is not less than 200 meshes; the edible oil is one or more of vegetable oil and animal oil.
The cement is ordinary portland cement with a grade of 42.5.
Ethylcellulose is an analytically pure white powder.
The preparation method of the modified asphalt comprises the following steps:
step one, preparing 1000ml of 5% cement slurry solution, slowly adding the rosmarinus officinalis extract and the olive leaf extract into the cement slurry, fully stirring for 1 hour at the speed of 800r/min, and performing spray drying on the dispersion to obtain an antioxidant microcapsule A taking the cement slurry as a matrix;
step two, fully dispersing ethyl cellulose in dichloromethane, adding a cement-extract antioxidant microcapsule, fully stirring at 800r/min for 1 hour to uniformly disperse the cement-extract antioxidant microcapsule in ethyl cellulose emulsion to obtain dispersion liquid B; and (3) carrying out spray drying on the dispersion liquid B to obtain the slow-release antioxidant microcapsule C with the outermost layer of ethyl cellulose, the middle layer of cement paste and the inner layer of rosewood extract and olive leaf extract.
Step three, heating the matrix asphalt to 145 ℃, adding edible oil, and stirring in a stirring pot for 150 seconds to obtain modified asphalt MA, wherein the stirring speed is 400r/min, and the step can be used for diluting the matrix asphalt;
step four, keeping the temperature of the modified asphalt MA at 145 ℃, adding the slow-release antioxidant microcapsule C and the stabilizer, and stirring in a stirring pot for 450 seconds to obtain modified asphalt MB, wherein the stirring speed is 400r/min, and the modified asphalt with relatively stable performance can be obtained in the step;
and step five, keeping the temperature of the modified asphalt MB at 145 ℃, adding the hindered phenol antioxidant and the ultraviolet absorbent, and stirring for 450 seconds at the stirring speed of 400r/min to obtain the final modified asphalt.
Comparative example
The comparative example is a pure base asphalt.
Properties of the example and comparative example bitumens
A thin film oven aging test (TFOT) was performed on three groups of example and one group of comparative example asphalts to simulate short term aging effects. The film oven aging test was carried out according to the road engineering asphalt and asphalt mixture test protocol (JTG E20-2011). The penetration, softening point and viscosity of the example and comparative example asphalts, respectively, were tested after TFOT and the results are shown in table 1, where the viscosity test was performed at 135 ℃ for more convenient viscosity testing.
(Table 1 penetration, softening point and viscosity comparison)
Penetration ratio:
in the formula: kP-sample film after heating residue penetration ratio,%; p1The penetration of the original sample before the film heating test is 0.1 mm; p2Penetration of the original sample, 0.1mm, before the film heat test.
Increase of softening point of residue:
ΔT＝T2-T1
in the formula: delta T-increase in softening point after film heating test, DEG C; t is1Softening point, deg.C, before film heating test; t is2Softening point, deg.C after film heating test.
Viscosity ratio:
in the formula: kη-viscosity ratio of 135 ℃ before and after heating of the film; eta1Viscosity at 135 ℃ before film heating test, Pa.s; eta2Viscosity at 135 ℃ after film heating test, Pa.s.
The penetration ratio, softening point increase and viscosity ratio after aging are shown in Table 2.
(Table 2 needle penetration ratio, softening point increase and viscosity ratio comparison after aging)
| Penetration ratio (%) | Softening Point increment (. degree. C.) | Viscosity ratio | |
| Comparative example | 76.37681159 | 4.3 | 0.827434 |
| Example 1 | 85.0877193 | 3.7 | 0.856354 |
| Example 2 | 89.13043478 | 4 | 0.88961 |
| Example 3 | 94.11764706 | 3.5 | 0.938591 |
As can be seen from Table 2, the penetration ratio of the examples is higher than that of the comparative examples, the softening point increment of the examples is smaller than that of the comparative examples, the viscosity ratio of the examples is higher than that of the comparative examples, and the anti-aging performance of the modified asphalt is better than that of the matrix asphalt.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.
Claims (10)
1. The modified asphalt is characterized by comprising the following components in parts by mass: 85-95 parts of matrix asphalt, 0-0.5 part of hindered phenol antioxidant, 0-0.5 part of ultraviolet absorbent, 1-2 parts of rosewood extract, 1-2 parts of olive leaf extract, 1-2 parts of cement, 1-2 parts of ethyl cellulose, 0.5-1.5 parts of stabilizer and 3-5 parts of edible oil.
2. The modified asphalt of claim 1, wherein: the components are as follows by mass: 85-90 parts of matrix asphalt, 0-0.5 part of hindered phenol antioxidant, 0-0.5 part of ultraviolet absorbent, 1-2 parts of rosewood extract, 1-2 parts of olive leaf extract, 1-2 parts of cement, 1-2 parts of ethyl cellulose, 0.5-1.5 parts of stabilizer and 3-5 parts of edible oil.
3. The modified asphalt according to claim 1 or 2, characterized in that: the main components of the rosewood extract are rosmarinic acid, carnosic acid and ursolic acid; the main components of the olive leaf extract are secoiridoid and glycoside thereof, flavone and glycoside thereof, biflavone and glycoside thereof and low molecular tannin.
4. The modified asphalt according to claim 1 or 2, characterized in that: the ultraviolet absorbent is one or more of phenyl salicylate, ultraviolet absorbent UV-P, ultraviolet absorbent UV-O, ultraviolet absorbent UV-531 and ultraviolet absorbent UV-327; the stabilizer is one or more of light stabilizer GW-540, light stabilizer 744 and stabilizer HPT.
5. The modified asphalt according to claim 1 or 2, characterized in that: the effective component of the hindered phenol antioxidant is more than or equal to 98 percent, and the fineness is not less than 200 meshes; the edible oil is one or more of vegetable oil and animal oil.
6. A method for producing a modified asphalt according to any one of claims 1 to 5, characterized in that: the method comprises the following steps:
s1, preparing a cement slurry solution with the concentration of 5%, slowly adding the rosewood extract and the olive leaf extract into the cement slurry, fully stirring, and carrying out spray drying on the dispersion to obtain a cement-extract antioxidant microcapsule A;
s2, fully dispersing ethyl cellulose in dichloromethane, adding the cement-extract antioxidant microcapsule A, fully stirring to uniformly disperse the cement-extract antioxidant microcapsule A in ethyl cellulose emulsion to obtain dispersion liquid B; spray drying the dispersion liquid B to obtain a slow-release antioxidant microcapsule C;
s3, heating the matrix asphalt to 140-150 ℃, adding edible oil, and stirring in a stirring container to obtain modified asphalt MA;
s4, keeping the temperature of the modified asphalt MA at 140-150 ℃, adding the slow-release antioxidant microcapsule C and the stabilizer, and stirring in a stirring container to obtain modified asphalt MB;
and S5, keeping the temperature of the modified asphalt MB at 140-150 ℃, adding the hindered phenol antioxidant and the ultraviolet absorbent, and stirring in a stirring container to obtain the final modified asphalt.
7. The process for producing modified asphalt according to claim 6, wherein: the fully stirring in the step S1 and the step S2 is specifically: the stirring speed is 800r/min, and the stirring time is 1 h.
8. The process for producing modified asphalt according to claim 6, wherein: the slow-release antioxidant microcapsule C in the step S2 is: the outermost layer is ethyl cellulose, the middle layer is cement paste, and the inner layer is a slow-release antioxidant microcapsule C of a rosewood extract and an olive leaf extract.
9. The process for producing modified asphalt according to claim 6, wherein: and (S3), stirring for 120-180 seconds at a stirring speed of 300-500 r/min.
10. The process for producing modified asphalt according to claim 6, wherein: and stirring in the step S4 and the step S5, wherein the stirring time is 300-600 seconds, and the stirring speed is 300-500 r/min.
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