CN113136108A - Preparation method of superfine inorganic micro powder modified asphalt - Google Patents
Preparation method of superfine inorganic micro powder modified asphalt Download PDFInfo
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- CN113136108A CN113136108A CN202110363706.4A CN202110363706A CN113136108A CN 113136108 A CN113136108 A CN 113136108A CN 202110363706 A CN202110363706 A CN 202110363706A CN 113136108 A CN113136108 A CN 113136108A
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- 239000010426 asphalt Substances 0.000 title claims abstract description 104
- 239000000843 powder Substances 0.000 title claims abstract description 102
- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- 230000004048 modification Effects 0.000 claims abstract description 48
- 238000012986 modification Methods 0.000 claims abstract description 48
- 239000011159 matrix material Substances 0.000 claims abstract description 47
- 239000000463 material Substances 0.000 claims abstract description 44
- 239000003607 modifier Substances 0.000 claims abstract description 36
- 238000010008 shearing Methods 0.000 claims abstract description 18
- 238000010438 heat treatment Methods 0.000 claims abstract description 3
- 238000002844 melting Methods 0.000 claims abstract description 3
- 230000008018 melting Effects 0.000 claims abstract description 3
- 238000000227 grinding Methods 0.000 claims description 40
- 239000002245 particle Substances 0.000 claims description 40
- 238000002156 mixing Methods 0.000 claims description 16
- 239000002002 slurry Substances 0.000 claims description 15
- 239000000919 ceramic Substances 0.000 claims description 14
- 239000002893 slag Substances 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 11
- 239000004575 stone Substances 0.000 claims description 11
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 10
- 229910021487 silica fume Inorganic materials 0.000 claims description 10
- 238000012216 screening Methods 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 7
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 5
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 4
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 claims description 4
- 239000003921 oil Substances 0.000 claims description 4
- 235000019198 oils Nutrition 0.000 claims description 4
- 239000010883 coal ash Substances 0.000 claims description 3
- 239000003350 kerosene Substances 0.000 claims description 3
- 239000010705 motor oil Substances 0.000 claims description 3
- 239000002699 waste material Substances 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 2
- UQZIWOQVLUASCR-UHFFFAOYSA-N alumane;titanium Chemical compound [AlH3].[Ti] UQZIWOQVLUASCR-UHFFFAOYSA-N 0.000 claims description 2
- 239000002131 composite material Substances 0.000 claims description 2
- 239000007822 coupling agent Substances 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 235000015112 vegetable and seed oil Nutrition 0.000 claims description 2
- 239000008158 vegetable oil Substances 0.000 claims description 2
- 238000003756 stirring Methods 0.000 abstract description 9
- 238000005054 agglomeration Methods 0.000 abstract description 6
- 230000002776 aggregation Effects 0.000 abstract description 6
- 238000009826 distribution Methods 0.000 abstract description 2
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- 239000000203 mixture Substances 0.000 description 18
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 10
- 229910052698 phosphorus Inorganic materials 0.000 description 10
- 239000011574 phosphorus Substances 0.000 description 10
- 239000010881 fly ash Substances 0.000 description 8
- 239000000084 colloidal system Substances 0.000 description 4
- 239000006185 dispersion Substances 0.000 description 3
- 230000010355 oscillation Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
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- 230000007547 defect Effects 0.000 description 2
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- 230000002209 hydrophobic effect Effects 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 238000005411 Van der Waals force Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000011384 asphalt concrete Substances 0.000 description 1
- 239000012075 bio-oil Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 125000001165 hydrophobic group Chemical group 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
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- 239000002910 solid waste Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
- C08K9/04—Ingredients treated with organic substances
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/01—Use of inorganic substances as compounding ingredients characterized by their specific function
- C08K3/013—Fillers, pigments or reinforcing additives
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
- C08K7/22—Expanded, porous or hollow particles
- C08K7/24—Expanded, porous or hollow particles inorganic
- C08K7/26—Silicon- containing compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
- C08K9/04—Ingredients treated with organic substances
- C08K9/06—Ingredients treated with organic substances with silicon-containing compounds
Abstract
The invention relates to the technical field of modified asphalt, in particular to a preparation method of superfine inorganic micro powder modified asphalt, which comprises the steps of carrying out oil milling on inorganic modified material micro powder and an oily surface modifier in a ball mill to obtain a surface modified inorganic micro powder modifier, heating and melting a matrix asphalt powder modification tank, adding the surface modified inorganic micro powder modifier, shearing at a rotating speed by a high-speed shearing machine, and stirring in a stirrer to obtain the surface modified inorganic micro powder modified matrix asphalt. According to the invention, the surface modifier is used for modifying the inorganic modified material micro powder through the oil mill, so that a framework and a bridge are formed between the inorganic modified material micro powder and the matrix asphalt, the compatibility of the inorganic modified material and the matrix asphalt is improved, and the problems of agglomeration and uneven distribution of the inorganic modified material micro powder when the inorganic modified material micro powder is mixed with the matrix asphalt are avoided, so that the modified asphalt with excellent performance is obtained.
Description
Technical Field
The invention relates to the technical field of asphalt materials, in particular to a preparation method of ultrafine inorganic micro powder modified asphalt.
Background
With the development of pavement technology and the petroleum industry, petroleum asphalt is widely used as a road material. The pavement performance of the asphalt concrete pavement is not only related to traffic load factors, but also more important to the asphalt material. Asphalt has the defects of strong temperature sensitivity, high temperature softening and stickiness, low temperature brittleness and easy cracking, aging phenomenon under high temperature and ultraviolet irradiation, poor fatigue resistance and the like, so the service performance of the asphalt is limited to a certain extent. The modification of asphalt becomes an effective measure for improving the performance of asphalt materials, wherein the inorganic modification of asphalt not only can improve the performance of asphalt, but also can reduce the cost to a great extent, and thus becomes one of the hot spots of research.
The prior art CN10398072A, CN104830079A, CN104479383A and the like have studied inorganic modification on asphalt, but the existing modification method only simply blends a modifier and matrix asphalt, because of agglomeration of powder, when inorganic micro powder is added into the asphalt, segregation with different degrees can occur along with the increase of the blending amount, the service performance of the inorganic powder modified asphalt is influenced, the particle size of the surface modified inorganic micro powder and other inorganic asphalt modified materials is usually smaller, and the surface modified inorganic micro powder and other inorganic asphalt modified materials reach micron or even nano level, and belong to ultra-micro powder. The ultrafine powder has small particle size, so the ultrafine powder has extremely large specific surface area and higher surface energy, is in an extremely unstable state, is agglomerated under the actions of coulomb force and van der waals force, is easy to form secondary particles in the production and application processes, enlarges the particle size and influences the use effect of the ultrafine powder. When the powder is added into asphalt, the powder usually loses the original advantages because the powder cannot be well and uniformly dispersed in the asphalt, and sometimes the using effect is opposite. Taking the phosphorus slag micro powder as an example, the phosphorus slag micro powder is a compound consisting of a plurality of substances, belongs to a polar inorganic material, and has the characteristics of hydrophilicity and lipophobicity on the surface. The asphalt belongs to an organic polymer material, the surface characteristics or the interface properties of the asphalt and the asphalt are different, the phosphorus slag micro powder cannot be combined with the asphalt due to the compatibility difference between the asphalt and the asphalt, and when the phosphorus slag micro powder is excessively added, the segregation phenomenon is easy to generate, so that the performance of the asphalt cannot be improved, and the performance of some aspects is reduced. Therefore, how to reduce the agglomeration among the inorganic micropowder particles and improve the interface compatibility of the inorganic micropowder and the asphalt so as to obtain the modified asphalt with excellent performance becomes a key problem for the application of the inorganic micropowder in the field of asphalt materials.
Disclosure of Invention
The invention aims to provide a preparation method of superfine inorganic micro powder modified asphalt aiming at the defects of the prior art, and solves the problems that inorganic micro powder is easy to agglomerate, poor in asphalt dispersibility, poor in interface compatibility and poor in use performance of the inorganic micro powder modified asphalt in the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: a preparation method of superfine inorganic micro powder modified asphalt comprises the following steps:
(1) crushing and screening the matrix asphalt to obtain matrix asphalt powder with the median particle size of 0.6-1 mm;
(2) mechanically grinding the inorganic modified material to obtain inorganic modified material micro powder with the median particle size of less than 1 mu m;
(3) placing inorganic modified material micro powder, oily surface modifier and grinding medium in a vertical ball mill for grinding to obtain slurry, and filtering the slurry to obtain surface modified inorganic micro powder modifier;
(4) adding 100 parts by weight of matrix asphalt powder into a modification tank for heating and melting, adding 1-6 parts by weight of surface modification inorganic micro powder modifier, shearing for 20-50min at a rotating speed of 3000-.
Specifically, the weight ratio of the inorganic modified material micropowder to the surface modifier in the step (3) is 0.6: (0.8-2.2).
Specifically, in the step (2), the inorganic modified material is one or more of silica fume, phosphorous slag, coal ash, stone powder and ceramics.
Specifically, in the step (3), the surface modifier is one or more of phosphoric acid mono-alkoxy titanate, a composite aluminum-titanium coupling agent, a silane coupling agent, phosphoric acid mono-alkoxy titanate and silane coupling agent, biological oil, kerosene, vegetable oil and waste engine oil.
Specifically, when the grinding is carried out in the step (3), the rotating speed of the vertical ball mill is 300-400r/s, and the grinding time is 0.5-3 h.
Specifically, the median particle size of the solids in the slurry was 500-1000 nm.
Specifically, the step (4) is arranged in the stirrer and stirred for 60-120min at the mixing temperature of 170-180 ℃ at 1200 r/min.
Specifically, the base asphalt is No. 10 asphalt.
Specifically, in the step (4), the weight of the grinding medium is 300-400g, the grinding medium is iron balls, agate balls or zirconia balls, the weight percentage of the grinding medium particle size is 20-30% for large balls with the particle size of 2-3 mm, 30-40% for medium balls with the particle size of 1-2 mm, and 30-40% for small balls with the particle size of 0.5-1 mm.
The invention has the beneficial effects that:
1. according to the invention, the surface modifier is introduced to the surface of the inorganic modified material micro powder through an oil mill, the inorganic modified material micro powder is modified, a framework and a bridge are formed between the matrix asphalt and the inorganic modified material micro powder, the interface compatibility of the inorganic modified material and the matrix asphalt is improved, and the problems of agglomeration and uneven dispersion of the inorganic modified material micro powder when the inorganic modified material micro powder is mixed with the matrix asphalt are avoided;
2. according to the surface modification inorganic micro powder modifier colloid system obtained by the invention, hydrophilic groups of the colloid system all point to the internal inorganic modification material micro powder, and one end of a hydrophobic group of the colloid system all points to the outside, so that the colloid system is hydrophobic, and the surface modification inorganic micro powder modifier and the matrix asphalt have good compatibility according to the similar compatibility principle; the surface modification inorganic micro powder modifier and the matrix asphalt have no obvious chemical reaction, mainly including dispersion, mixing, adsorption and crosslinking among phases to form a gel network, and the crosslinking force among the networks limits the motion matrix particles, thereby greatly reducing the fluidity of the system, avoiding the problems of agglomeration, uneven dispersion and the like among the inorganic modification materials, and improving the interface compatibility of the inorganic modification materials and the matrix asphalt;
3. the invention fully utilizes solid wastes, has wide material source, easy processing and simple processing equipment, and is beneficial to reducing the cost, reducing the accumulation and reducing the environmental pollution.
Drawings
FIG. 1 is a schematic diagram of the mechanism of action of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and specific examples, which are not intended to limit the scope of the invention.
The present invention will be further described with reference to specific examples, which are not intended to limit the scope of the present invention.
A preparation method of superfine inorganic micro powder modified asphalt comprises the following steps:
(1) crushing and screening the matrix asphalt to obtain matrix asphalt powder with the median particle size of 0.6-1 mm;
(2) and mechanically grinding the inorganic modified material to obtain inorganic modified material micro powder with the median particle size of less than 1 mu m, wherein the grinding time is 1.5 h.
(3) Mixing inorganic modified material micro powder, an oily surface modifier and grinding balls, wherein the weight ratio of the inorganic modified material micro powder to the surface modifier is 0.6: (0.8-2.2), preferably in a weight ratio of 0.6: 1.5, placing the mixture in a vertical ball mill, grinding the mixture for 0.5 to 3 hours at the rotating speed of 300-400r/s to obtain slurry with the median particle size of 500-1000nm, and vibrating and filtering the slurry to obtain the surface modification inorganic micropowder modifier.
(4) Adding ground matrix asphalt powder into a modification tank at 180 ℃ to be melted to a flowing state, adding a surface modification inorganic micro powder modifier, shearing the mixture for 30min at 4000r/min by using a high-speed shearing machine, then placing the mixture in a stirrer to be stirred for 90min at 1000r/min, and stirring and mixing at 180 ℃ at 170 ℃ to obtain the surface modification inorganic micro powder modified matrix asphalt.
Example 1
(1) Crushing and screening the matrix asphalt to obtain matrix asphalt powder with the median particle size of 0.6-1 mm;
(2) mechanically grinding the silica fume until the median particle size of the silica fume is less than 1um, wherein the grinding time is 1.5 h;
(3) taking 50g of dry-ground silica fume micro powder, mixing 125g of waste engine oil with grinding balls (300-400g), placing the mixture in a vertical ball mill, grinding the mixture for 0.5-3 h at the rotating speed of 300-400r/s to obtain slurry with the median particle size of 500-1000nm, and carrying out oscillation filtration to obtain the surface modification silica fume modifier;
(4) 300g of matrix asphalt powder is added into a modification tank at 180 ℃ to be melted to a flowing state, 18g of surface modification silica fume modifier is added, a high-speed shearing machine is used for shearing for 30min at the rotating speed of 4000r/min, then the mixture is placed into a stirrer to be stirred for 90min at the rotating speed of 1000r/min, and the stirring and mixing temperature is 170-180 ℃, so that the surface modification silica fume modified asphalt is obtained.
Example 2
(1) Crushing and screening the matrix asphalt to obtain matrix asphalt powder with the median particle size of 0.6-1 mm;
(2) mechanically grinding the phosphorus slag until the median particle size of the phosphorus slag is less than 1um, wherein the grinding time is 1.5 h;
(3) taking 50g of dry-ground phosphorus slag micro powder, 125g of phosphoric acid mono-alkoxy titanate (TM-P) and 300-400g of grinding balls, mixing, placing in a vertical ball mill, grinding at the rotating speed of 300-400r/s for 0.5-3 h to obtain slurry with the median particle size of 500-1000nm, and carrying out oscillation filtration to obtain the surface modification phosphorus slag modifier;
(4) 300g of matrix asphalt powder is added into a modification tank at 180 ℃ to be melted to a flowing state, 18g of surface modification phosphorus slag modifier is added, a high-speed shearing machine is used for shearing for 30min at the rotating speed of 4000r/min, then the mixture is placed into a stirrer to be stirred for 90min at the rotating speed of 1000r/min, and the stirring and mixing temperature is 170-180 ℃, so that the surface modification phosphorus slag modified asphalt is obtained.
Example 3
(1) Crushing and screening the matrix asphalt to obtain matrix asphalt powder with the median particle size of 0.6-1 mm;
(2) mechanically grinding the fly ash until the fly ash micro powder with the median particle size of less than 1um lasts for 1.5 h;
(3) taking 50g of dry-ground fly ash micro powder, mixing 125g of bio-oil with 300-plus 400g of grinding balls, placing the mixture in a vertical ball mill, grinding the mixture for 0.5h-3h at the rotating speed of 300-plus 400r/s to obtain slurry with the median particle size of 500-plus 1000nm, and performing oscillation filtration to obtain the surface modification fly ash modifier. The particle size of the milled coal ash was measured to be 850nm by a laser particle sizer.
(4) Adding 300g of matrix asphalt powder into a modification tank at 180 ℃ to a flowing state, adding 18g of surface modification fly ash modifier, shearing for 30min at a rotation speed of 4000r/min by using a high-speed shearing machine, then placing the mixture into a stirrer, stirring for 90min at a rotation speed of 1000r/min, and stirring and mixing at the temperature of 170-180 ℃ to obtain the surface modification fly ash modified asphalt.
Example 4
(1) Crushing and screening the matrix asphalt to obtain matrix asphalt powder with the median particle size of 0.6-1 mm;
(2) mechanically grinding the stone powder until the median particle size of the stone powder is less than 1um, wherein the grinding time is 1.5 h;
(3) 50g of dry ground stone powder, 125g of silane coupling agent (KH-570) and 300-400g of grinding balls are mixed, the mixture is placed in an upright ball mill to be ground for 0.5h-3h at the rotating speed of 300-400r/s to obtain slurry with the median particle size of 500-1000nm, and the slurry is vibrated and filtered to obtain the surface modification stone powder modifier. The particle size of the oil-milled stone powder measured by a laser particle sizer was 700 nm.
(4) 300g of matrix asphalt powder is added into a modification tank at 180 ℃ to be melted to a flowing state, 18g of surface modification stone powder modifier is added, a high-speed shearing machine is used for shearing for 30min at the rotating speed of 4000r/min, then the mixture is placed into a stirrer to be stirred for 90min at the rotating speed of 1000r/min, and the stirring and mixing temperature is 170-180 ℃, so that the surface modification stone powder modified asphalt is obtained.
Example 5
(1) Crushing and screening the matrix asphalt to obtain matrix asphalt powder with the median particle size of 0.6-1 mm;
(2) mechanically grinding the ceramic until the median particle size of the ceramic is less than 1um, wherein the grinding time is 1.5 h;
(3) taking 50g of dry-ground ceramic micro powder, 125g of kerosene and 300-400g of grinding balls, placing the mixture in a vertical ball mill, grinding the mixture for 0.5h-3h at the rotating speed of 300-400r/s to obtain slurry with the median particle size of 500-1000nm, and vibrating and filtering the slurry to obtain the surface modification ceramic modifier. The grain size of the oil-milled ceramic is 700nm measured by a laser particle sizer.
(4) 300g of matrix asphalt powder is added into a modification tank at 180 ℃ to be melted to a flowing state, 18g of surface modification ceramic modifier is added, a high-speed shearing machine is used for shearing for 30min at the rotating speed of 4000r/min, then the mixture is placed into a stirrer to be stirred for 90min at the rotating speed of 1000r/min, and the stirring and mixing temperature is 170-180 ℃, so that the surface modification ceramic modified asphalt is obtained.
Control group 1
(1) Crushing and screening the matrix asphalt to obtain matrix asphalt powder with the median particle size of 0.6-1 mm;
(2) mechanically grinding the ceramic until the median particle size of the ceramic is less than 1um, wherein the grinding time is 1.5 h;
(3) adding 300g of matrix asphalt powder into a modification tank at 180 ℃ to be melted to a flowing state, adding 18g of ceramic micro powder, shearing for 30min by a high-speed shearing machine at the rotating speed of 4000r/min, then placing the mixture into a stirrer to be stirred for 90min at the rotating speed of 1000r/min, and stirring and mixing at the temperature of 170-180 ℃ to obtain the inorganic micro powder modified asphalt.
As can be seen from the above table, compared with the control group, the inorganic micro powder modified asphalt obtained by adding the surface modification inorganic micro powder modifier in the embodiments 1 to 6 of the present invention has better viscosity, and the interface of the surface modification inorganic micro powder modifier is smooth and does not agglomerate, because the inorganic modification material micro powder is modified by the surface modifier through the oil mill, a connecting skeleton and a bridge are formed between the matrix asphalt and the inorganic modification material micro powder, so that the compatibility between the matrix asphalt and the inorganic modification material micro powder is improved, the inorganic modification material is uniformly dispersed in the matrix asphalt, and the inorganic modification material micro powder added in the control group 1 is not surface modified, and during the mixing process with the matrix asphalt, the compatibility between the inorganic modification material micro powder and the matrix asphalt is poor, so that serious agglomeration and uneven distribution occur, and the performance of the modified asphalt is affected.
The asphalt is hydrophobic, and inorganic modified materials such as silica fume, phosphorous slag, fly ash, stone powder, ceramic and the like are hydrophilic, and the difference between the silica fume, the phosphorous slag, the fly ash, the stone powder, the ceramic and the like is great according to the similar compatibility principle.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (9)
1. A preparation method of superfine inorganic micro powder modified asphalt is characterized by comprising the following steps: the method comprises the following steps:
(1) crushing and screening the matrix asphalt to obtain matrix asphalt powder with the median particle size of 0.6-1 mm;
(2) mechanically grinding the inorganic modified material to obtain inorganic modified material micro powder with the median particle size of less than 1 mu m;
(3) placing inorganic modified material micro powder, oily surface modifier and grinding medium in a vertical ball mill for grinding to obtain slurry, and filtering the slurry to obtain surface modified inorganic micro powder modifier;
(4) adding 100 parts by weight of matrix asphalt powder into a modification tank for heating and melting, adding 1-6 parts by weight of surface modification inorganic micro powder modifier, shearing for 20-50min at a rotating speed of 3000-.
2. The method for preparing the ultrafine inorganic micropowder modified asphalt according to claim 1, characterized in that: in the step (3), the weight ratio of the inorganic modified material micro powder to the surface modifier is 0.6: (0.8-2.2).
3. The method for preparing the ultrafine inorganic micropowder modified asphalt according to claim 1, characterized in that: in the step (2), the inorganic modified material is one or more of silica fume, phosphorous slag, coal ash, stone powder and ceramics.
4. The method for preparing the ultrafine inorganic micropowder modified asphalt according to claim 1, characterized in that: the surface modifier in the step (3) is one or more of phosphoric acid mono-alkoxy titanate, a composite aluminum-titanium coupling agent, a silane coupling agent, phosphoric acid mono-alkoxy titanate, a silane coupling agent, biological oil, kerosene, vegetable oil and waste engine oil.
5. The method for preparing the ultrafine inorganic micropowder modified asphalt according to claim 1, characterized in that: and (4) during grinding in the step (3), the rotating speed of the vertical ball mill is 300-400r/s, and the grinding time is 0.5-3 h.
6. The method for preparing the ultrafine inorganic micropowder modified asphalt according to claim 1, characterized in that: the median particle size of the solids in the slurry was 500-1000 nm.
7. The method for preparing the ultrafine inorganic micropowder modified asphalt according to claim 1, characterized in that: the step (4) is arranged in the stirrer and stirred for 60-120min at the mixing temperature of 170-180 ℃ at the speed of 800-1200 r/min.
8. The method for preparing the ultrafine inorganic micropowder modified asphalt according to claim 1, characterized in that: the matrix asphalt is No. 10 asphalt.
9. The method for preparing the ultrafine inorganic micropowder modified asphalt according to claim 1, characterized in that: the weight of the grinding medium in the step (4) is 300-400g, the grinding medium is iron balls, agate balls or zirconia balls, the weight percentage of the grain diameter of the grinding medium is 20-30% of that of 2-3 mm big balls, 30-40% of that of 1-2 mm middle balls and 30-40% of that of 0.5-1 mm small balls.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115521628A (en) * | 2022-10-25 | 2022-12-27 | 湖北工业大学 | Multilayer grafted aging-resistant recycled asphalt, and preparation method and application thereof |
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