CN117106314A - Block copolymer-nano composite modified emulsified asphalt and preparation method thereof - Google Patents
Block copolymer-nano composite modified emulsified asphalt and preparation method thereof Download PDFInfo
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- CN117106314A CN117106314A CN202311365360.7A CN202311365360A CN117106314A CN 117106314 A CN117106314 A CN 117106314A CN 202311365360 A CN202311365360 A CN 202311365360A CN 117106314 A CN117106314 A CN 117106314A
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- 239000010426 asphalt Substances 0.000 title claims abstract description 178
- 238000002360 preparation method Methods 0.000 title claims abstract description 42
- 239000002114 nanocomposite Substances 0.000 title claims abstract description 31
- 239000008149 soap solution Substances 0.000 claims abstract description 51
- 239000003607 modifier Substances 0.000 claims abstract description 41
- 229920002725 thermoplastic elastomer Polymers 0.000 claims abstract description 36
- HYBBIBNJHNGZAN-UHFFFAOYSA-N furfural Chemical compound O=CC1=CC=CO1 HYBBIBNJHNGZAN-UHFFFAOYSA-N 0.000 claims abstract description 34
- 239000012782 phase change material Substances 0.000 claims abstract description 31
- 239000003995 emulsifying agent Substances 0.000 claims abstract description 28
- 239000011159 matrix material Substances 0.000 claims abstract description 26
- 239000003208 petroleum Substances 0.000 claims abstract description 23
- 239000011347 resin Substances 0.000 claims abstract description 23
- 229920005989 resin Polymers 0.000 claims abstract description 23
- 238000002156 mixing Methods 0.000 claims abstract description 19
- 239000003381 stabilizer Substances 0.000 claims abstract description 19
- 239000000126 substance Substances 0.000 claims abstract description 17
- 239000000284 extract Substances 0.000 claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 230000001804 emulsifying effect Effects 0.000 claims abstract description 14
- 239000008213 purified water Substances 0.000 claims abstract description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000002253 acid Substances 0.000 claims abstract description 9
- 238000005336 cracking Methods 0.000 claims abstract description 9
- 229910021389 graphene Inorganic materials 0.000 claims abstract description 6
- 239000007788 liquid Substances 0.000 claims abstract 3
- 239000000344 soap Substances 0.000 claims abstract 3
- 238000003756 stirring Methods 0.000 claims description 91
- 238000000034 method Methods 0.000 claims description 52
- 238000010008 shearing Methods 0.000 claims description 50
- 230000008569 process Effects 0.000 claims description 46
- 239000000203 mixture Substances 0.000 claims description 42
- 238000004945 emulsification Methods 0.000 claims description 41
- 238000010438 heat treatment Methods 0.000 claims description 27
- 239000000463 material Substances 0.000 claims description 21
- 239000000084 colloidal system Substances 0.000 claims description 20
- 239000011521 glass Substances 0.000 claims description 19
- 238000010907 mechanical stirring Methods 0.000 claims description 15
- 238000005303 weighing Methods 0.000 claims description 15
- 238000012360 testing method Methods 0.000 claims description 12
- 238000011161 development Methods 0.000 claims description 10
- 230000008961 swelling Effects 0.000 claims description 10
- 229920000346 polystyrene-polyisoprene block-polystyrene Polymers 0.000 claims description 8
- 229920000468 styrene butadiene styrene block copolymer Polymers 0.000 claims description 8
- 239000004744 fabric Substances 0.000 claims description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 6
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims description 6
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims description 6
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 6
- 230000002378 acidificating effect Effects 0.000 claims description 5
- 239000012752 auxiliary agent Substances 0.000 claims description 5
- 239000006185 dispersion Substances 0.000 claims description 5
- 238000007781 pre-processing Methods 0.000 claims description 5
- 229920001935 styrene-ethylene-butadiene-styrene Polymers 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 4
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 3
- 229910021578 Iron(III) chloride Inorganic materials 0.000 claims description 3
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 3
- 150000001412 amines Chemical class 0.000 claims description 3
- 150000003863 ammonium salts Chemical class 0.000 claims description 3
- 239000001110 calcium chloride Substances 0.000 claims description 3
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 3
- 239000002041 carbon nanotube Substances 0.000 claims description 3
- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 3
- 150000003841 chloride salts Chemical class 0.000 claims description 3
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims description 3
- 229910001629 magnesium chloride Inorganic materials 0.000 claims description 3
- 239000012802 nanoclay Substances 0.000 claims description 3
- 229910017604 nitric acid Inorganic materials 0.000 claims description 3
- 239000001103 potassium chloride Substances 0.000 claims description 3
- 235000011164 potassium chloride Nutrition 0.000 claims description 3
- 239000011780 sodium chloride Substances 0.000 claims description 3
- 229920006132 styrene block copolymer Polymers 0.000 claims description 3
- -1 styrene-ethylene-butylene-styrene Chemical class 0.000 claims description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims 2
- 235000010216 calcium carbonate Nutrition 0.000 claims 1
- 229910000019 calcium carbonate Inorganic materials 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 4
- 230000001360 synchronised effect Effects 0.000 abstract description 4
- 239000002086 nanomaterial Substances 0.000 abstract description 2
- 230000006872 improvement Effects 0.000 description 9
- 239000010410 layer Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 239000000243 solution Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- FGRBYDKOBBBPOI-UHFFFAOYSA-N 10,10-dioxo-2-[4-(N-phenylanilino)phenyl]thioxanthen-9-one Chemical compound O=C1c2ccccc2S(=O)(=O)c2ccc(cc12)-c1ccc(cc1)N(c1ccccc1)c1ccccc1 FGRBYDKOBBBPOI-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000002344 surface layer Substances 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/23—Mixers with rotary stirring devices in fixed receptacles; Kneaders characterised by the orientation or disposition of the rotor axis
- B01F27/232—Mixers with rotary stirring devices in fixed receptacles; Kneaders characterised by the orientation or disposition of the rotor axis with two or more rotation axes
- B01F27/2322—Mixers with rotary stirring devices in fixed receptacles; Kneaders characterised by the orientation or disposition of the rotor axis with two or more rotation axes with parallel axes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/90—Heating or cooling systems
- B01F35/95—Heating or cooling systems using heated or cooled stirrers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F2101/00—Mixing characterised by the nature of the mixed materials or by the application field
- B01F2101/38—Mixing of asphalt, bitumen, tar or pitch or their ingredients
-
- 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
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
-
- 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
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/04—Thermoplastic elastomer
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
- Working-Up Tar And Pitch (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses block copolymer-nano composite modified emulsified asphalt and a preparation method thereof, wherein the block copolymer-nano composite modified emulsified asphalt comprises modified asphalt and soap liquid, and the modified asphalt comprises the following substances in parts by mass: 100-120 parts of matrix asphalt, 6-16 parts of thermoplastic elastomer modifier, 0.5-2 parts of phase change material, 0.3-1.5 parts of graphene, 1-4 parts of furfural extract oil and 1-5 parts of petroleum resin; the soap solution comprises the following substances in parts by mass: 100 parts of purified water, 5-20 parts of emulsifying agent, 0.1-2 parts of stabilizing agent and 0.1-3 parts of acid; the weight ratio of the modified asphalt to the soap solution is 1:0.2-0.7, the invention increases the mixing amount of the modifier by adopting a preparation process of modifying before emulsifying, improves the performance of emulsified asphalt residues, ensures that emulsified asphalt can be demulsified in a short time by utilizing a quick-cracking emulsifier, meets the technical requirements of synchronous paving construction, and improves the dispersing effect of the modifier in asphalt and the compatibility with asphalt by doping series of nano materials, petroleum resin and the like.
Description
Technical Field
The invention relates to the technical field of road engineering, in particular to block copolymer-nano composite modified emulsified asphalt and a preparation method thereof.
Background
At present, a finishing coat belongs to a novel technology in the preventive maintenance technology of pavement surface layers; the technology can be applied to asphalt pavement and cement pavement, and shows the universality of the thin-layer overlay technology; the thickness of the common thin-layer cover surface is only 20-25 mm, and the thin-layer cover has the advantages of noise reduction, skid resistance, rapid drainage, convenient construction, low manufacturing cost, rapid traffic opening and the like; however, in the application process, the adhesion between the thin layer and the original road surface is insufficient, and even the situation of falling off occurs, and the core problem is that the used emulsified asphalt cannot provide enough adhesive strength.
On one hand, because the emulsified asphalt has poor performance, the modified asphalt is difficult to disperse and emulsify, the production process of the modified emulsified asphalt is usually to emulsify and then modify, the modification effect is poor, and the mixing amount of the modifier is small; on the other hand, because the emulsion breaking speed of the emulsified asphalt is low, the thin-layer cover surface is usually constructed by adopting a synchronous paving mode, the emulsified asphalt is required to be rapidly broken, and the emulsified asphalt which is not broken cannot provide enough cohesive force, so that the asphalt pavement is fallen under the action of vehicle load.
Therefore, in view of the above technical problems, it is necessary to provide a block copolymer-nanocomposite modified emulsified asphalt and a method for preparing the same.
Disclosure of Invention
The invention aims to provide block copolymer-nano composite modified emulsified asphalt and a preparation method thereof, so as to solve the problems.
In order to achieve the above object, an embodiment of the present invention provides the following technical solution:
a block copolymer-nano composite modified emulsified asphalt and a preparation method thereof comprise modified asphalt and soap solution, wherein the modified asphalt comprises the following substances in parts by mass: 100-120 parts of matrix asphalt, 6-16 parts of thermoplastic rubber modifier, 0.5-2 parts of phase change material, 0.3-1.5 parts of graphene, 1-4 parts of furfural extract oil and 1-5 parts of petroleum resin; the soap solution comprises the following substances in parts by mass: 100 parts of purified water, 5-20 parts of emulsifying agent, 0.1-2 parts of stabilizing agent and 0.1-3 parts of acid; the weight ratio of the modified asphalt to the soap solution is 1:0.2-0.7.
As a further improvement of the present invention, the matrix asphalt is any one of 70#, 90# and 110# matrix asphalt.
As a further improvement of the invention, the thermoplastic rubber modifier is one or a mixture of a plurality of styrene-butadiene-styrene block copolymers, styrene-isoprene-styrene block copolymers and styrene-ethylene-butylene-styrene block copolymers.
As a further improvement of the invention, the phase change material is nano CaCO 3 One or a mixture of a plurality of nano clay and carbon nano tubes.
As a further improvement of the present invention, the petroleum resin is C 5 Petroleum resin, C 9 One or a mixture of several kinds of petroleum resin.
As a further improvement of the invention, the emulsifier is a quick-cracking type emulsifier, the quick-cracking type emulsifier is a mixture of an amine derivative and an ammonium salt, the stabilizer is anhydrous chloride salt and is any one of sodium chloride, potassium chloride, calcium chloride, magnesium chloride and ferric chloride, and the acid is any one of hydrochloric acid, sulfuric acid and nitric acid.
As a further improvement of the invention, the modified asphalt preparation, soap solution preparation and high-speed shearing emulsification are carried out, wherein the modified asphalt preparation comprises an asphalt heating and stirring process, a thermoplastic rubber modifier swelling process, a high-speed shearing dispersion process and a development process, and the detailed preparation steps are as follows:
s1, preprocessing a phase change material: weighing phase-change materials and furfural extract oil according to mass proportion, placing the materials into a stirring device, manually mixing and stirring the materials for 3-5min by using a glass rod, and standing the materials at normal temperature for 3-5min to enable the phase-change materials to fully absorb the furfural extract oil;
s2, heating and stirring asphalt: placing matrix asphalt in an oven, and heating at 135 ℃ for 30-40min until the matrix asphalt has good fluidity; weighing the mixture obtained by asphalt and S1 according to the mass ratio, mixing the mixture, and mechanically stirring the mixture at 180 ℃ for 10-15min at the stirring speed of 600rpm/min;
s3, swelling a thermoplastic rubber modifier: raising the stirring temperature in the step S3 to 190 ℃, slowly adding the weighed SBS, SIS, SEBS thermoplastic rubber modifier material into the mixture obtained in the step S2 under the condition of rapid stirring, and keeping the original rotation speed for continuous stirring for 45-60min so that the thermoplastic rubber modifier fully absorbs light components in the asphalt;
s4, high-speed shearing and dispersing: the mechanical stirring equipment in S2 and S3 is replaced by high-speed shearing equipment, the mixture of asphalt, thermoplastic rubber modifier, phase change material and other auxiliary agents obtained in S3 is sheared and dispersed at high speed, the shearing rate is set to 5500rpm/min, the high-speed shearing is carried out for 30-90min, and the temperature is kept unchanged;
s5, development: the high-speed shearing apparatus in S4 was replaced with a mechanical stirring apparatus, and petroleum resin was incorporated into the mixture obtained in S5, and mechanical stirring was performed at a rate of 600rpm/min at a temperature of 190℃for 120-180min to obtain a modified asphalt.
As a further improvement of the invention, the soap solution is prepared as follows:
s1, adding purified water into a heating container, and setting the temperature to 70 ℃;
s2, weighing the emulsifying agent and the stabilizing agent, adding the emulsifying agent and the stabilizing agent into hot water, and mechanically stirring at a stirring speed of 150-450rpm/min for 15-60min;
s3, adding an acidic substance in the stirring process to adjust the pH value of the soap solution to be 1.5-2.5, and testing once every 5-10 min.
As a further improvement of the invention, the high-speed shearing emulsification process adopts a DS-ECM type emulsification tester to carry out the emulsification process of the modified asphalt, and the specific emulsification process is as follows:
s1, setting temperature parameters: the test temperature in the pipeline and the colloid mill is set to be 60-200 ℃, and the weight ratio of the modified asphalt to the soap solution is 1:0.2-0.7;
s2, creating an emulsification environment: firstly, injecting soap solution into a pipeline to enable the interior of the pipeline to fully contain the soap solution, so that on one hand, smoothness of the interior of the pipeline is verified, and on the other hand, an emulsified environment is created for asphalt emulsification, and demulsification of asphalt in the emulsification process is avoided;
s3, high-speed shearing and emulsifying: injecting the modified asphalt into a colloid mill, mixing the soap solution and the modified asphalt in the colloid mill, and rapidly shearing, dispersing and emulsifying, wherein the rotating speed of the colloid mill is not lower than 5000rpm/min, and finally obtaining the block copolymer-nano composite modified emulsified asphalt.
As a further improvement of the invention, the stirring device comprises a stirring barrel and a containing barrel, wherein the upper end of the stirring barrel is fixedly connected with a sealing barrel cover, a rotary groove is formed in the middle of the lower end of the sealing barrel cover, a rotary plate is rotationally connected to the upper end of the containing barrel cover, a driving motor is embedded in the inner wall of the rotary groove, the output end of the driving motor is fixedly connected with the rotary plate, a pair of through holes are formed in the middle of the rotary plate, a stirring rod is connected in the sliding mode in the through holes, the stirring rod comprises a glass rod, the glass rod is connected in the through holes in a sliding mode, the upper end of the glass rod is fixedly connected with a heating rod, the middle of the glass rod is fixedly connected with a square magnetic plate, the containing barrel is fixedly connected to the upper end of the rotary plate, the containing barrel is communicated with the through holes, an electromagnetic plate is fixedly connected to the upper end of the containing barrel, a wiping ring is embedded in the through holes, the heat absorbing plate is embedded in the inner wall of the through holes, a stirring rod is connected with a heat expansion bag in the middle of the heat absorbing plate, and a flexible wiping cloth is fixedly connected to the inner end of the heat expansion bag.
Compared with the prior art, the invention has the advantages that:
according to the scheme, the preparation process of modifying before emulsifying is adopted, so that the mixing amount of the modifier is increased, the performance of emulsified asphalt residues is improved, the quick-cracking type emulsifier is utilized to ensure that emulsified asphalt can be demulsified in a short time, the technical requirement of synchronous paving construction is met, and meanwhile, the dispersing effect of the modifier in asphalt and the compatibility with asphalt are improved by doping a series of nano materials, petroleum resin and the like.
Drawings
FIG. 1 is a step diagram of a modified asphalt preparation method of the invention;
FIG. 2 is a step diagram of a soap solution preparation method of the present invention;
FIG. 3 is a step diagram of a high-speed shear emulsification method of the present invention;
FIG. 4 is a schematic view of a cross-sectional front view of a stirring device according to the present invention;
FIG. 5 is a schematic view of a partial stirrer bar front cross-sectional structure of the present invention;
FIG. 6 is a schematic view of a front cross-sectional structure of a wiper ring of the present invention;
FIG. 7 is a schematic view of the structure of the stirring rod in a retracted state according to the present invention;
FIG. 8 is a table of main performance indexes of the block copolymer-nanocomposite modified emulsified asphalt of the present invention.
The reference numerals in the figures illustrate:
1. a stirring cylinder; 2. a closing cap; 3. a rotating plate; 4. a driving motor; 5. a stirring rod; 51. a glass rod; 52. a heating rod; 53. square magnetic plate; 6. a storage barrel; 7. an electromagnetic plate; 8. a wiping ring; 81. a heat absorbing plate; 82. a thermal expansion bag; 83. a tough wipe.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments, and that all other embodiments obtained by persons of ordinary skill in the art without making creative efforts based on the embodiments in the present invention are within the protection scope of the present invention.
Example 1:
referring to fig. 1-3, a block copolymer-nanocomposite modified emulsified asphalt and a preparation method thereof, wherein the block copolymer-nanocomposite modified emulsified asphalt comprises modified asphalt and soap solution, and the modified asphalt comprises the following substances in parts by mass: 100 parts of matrix asphalt, 6 parts of thermoplastic rubber modifier, 0.5 part of phase change material, 0.3 part of graphene, 1 part of furfural extract oil and 1 part of petroleum resin; the soap solution comprises the following substances in parts by mass: 100 parts of purified water, 5 parts of emulsifying agent, 0.1 part of stabilizing agent and 0.1 part of acid; the weight ratio of the modified asphalt to the soap solution is 1:0.2.
the matrix asphalt is any one of 70# matrix asphalt, 90# matrix asphalt and 110# matrix asphalt.
The thermoplastic rubber modifier is one or a mixture of a plurality of styrene-butadiene-styrene block copolymer, styrene-isoprene-styrene block copolymer and styrene-ethylene-butylene-styrene block copolymer, and is used for improving the high-low temperature performance and the viscous toughness of the emulsified asphalt.
The phase change material is nano CaCO 3 One or a mixture of a plurality of nano clay and carbon nano tubes, which can improve the dynamic viscosity of asphalt and enhance the kinematic viscosity.
The petroleum resin is C 5 Petroleum resin, C 9 One or a mixture of several kinds of petroleum resin is used to increase the compatibility of thermoplastic rubber modifier and asphalt.
The emulsifier is a quick-cracking type emulsifier, the quick-cracking type emulsifier is a mixture of amine derivatives and ammonium salts, the quick-cracking type emulsifier is used for emulsifying modified asphalt and dispersing the modified asphalt in an aqueous solution, the stabilizer is anhydrous chloride salt and is any one of sodium chloride, potassium chloride, calcium chloride, magnesium chloride and ferric chloride, and the acid is any one of hydrochloric acid, sulfuric acid and nitric acid, so that the modified asphalt is prevented from being separated and precipitated to a large extent.
The preparation method comprises the following steps of modified asphalt preparation, soap solution preparation and high-speed shearing emulsification, wherein the modified asphalt preparation comprises an asphalt heating and stirring process, a thermoplastic rubber modifier swelling process, a high-speed shearing dispersion process and a development process, and the detailed preparation steps are as follows:
s1, preprocessing a phase change material: weighing phase-change materials and furfural extract oil according to mass proportion, placing the materials into a stirring device, manually mixing and stirring the materials for 3min by using a glass rod, and standing the materials at normal temperature for 3min to enable the phase-change materials to fully absorb the furfural extract oil;
s2, heating and stirring asphalt: placing the matrix asphalt in an oven, and heating at 135 ℃ for 30min until the matrix asphalt has good fluidity; weighing the mixture obtained by asphalt and S1 according to the mass ratio, mixing the mixture, and mechanically stirring the mixture at 180 ℃ for 10min at the stirring speed of 600rpm/min;
s3, swelling a thermoplastic rubber modifier: raising the stirring temperature in the step S3 to 190 ℃, slowly adding the weighed SBS, SIS, SEBS thermoplastic rubber modifier material into the mixture obtained in the step S2 under the condition of rapid stirring, and keeping the original rotation speed for continuously stirring for 45min so as to enable the thermoplastic rubber modifier to fully absorb light components in asphalt;
s4, high-speed shearing and dispersing: the mechanical stirring equipment in S2 and S3 is replaced by high-speed shearing equipment, the mixture of asphalt, thermoplastic rubber modifier, phase change material and other auxiliary agents obtained in S3 is sheared and dispersed at high speed, the shearing rate is set to 5500rpm/min, the high-speed shearing is carried out for 30min, and the temperature is kept unchanged;
s5, development: the high-speed shearing apparatus in S4 was replaced with a mechanical stirring apparatus, and petroleum resin was incorporated into the mixture obtained in S5, and mechanical stirring was performed at a rate of 600rpm/min at a temperature of 190℃for 120min to obtain a modified asphalt.
The soap solution preparation process is as follows:
s1, adding purified water into a heating container, and setting the temperature to 70 ℃;
s2, weighing the emulsifying agent and the stabilizing agent, adding the emulsifying agent and the stabilizing agent into hot water, and mechanically stirring at a stirring speed of 150rpm/min for 15min;
s3, adding an acidic substance in the stirring process to adjust the pH value of the soap solution to be 1.5, and testing once every 5-10 min.
The high-speed shearing emulsification process adopts a DS-ECM type emulsification tester to carry out the emulsification process of the modified asphalt, and the specific emulsification process is as follows:
s1, setting temperature parameters: the test temperature in the pipeline and the colloid mill is set to 60 ℃, and the weight ratio of the modified asphalt to the soap solution is 1:0.2;
s2, creating an emulsification environment: firstly, injecting soap solution into a pipeline to enable the interior of the pipeline to fully contain the soap solution, so that on one hand, smoothness of the interior of the pipeline is verified, and on the other hand, an emulsified environment is created for asphalt emulsification, and demulsification of asphalt in the emulsification process is avoided;
s3, high-speed shearing and emulsifying: injecting the modified asphalt into a colloid mill, mixing the soap solution and the modified asphalt in the colloid mill, and rapidly shearing, dispersing and emulsifying, wherein the rotating speed of the colloid mill is not lower than 5000rpm/min, and finally obtaining the block copolymer-nano composite modified emulsified asphalt.
Referring to fig. 4-7, the stirring device comprises a stirring cylinder 1 and a receiving cylinder 6, wherein the upper end of the stirring cylinder 1 is fixedly connected with a cylinder cover 2, the middle part of the lower end of the cylinder cover 2 is provided with a rotary groove, the rotary groove is rotationally connected with a rotary plate 3, the inner wall of the rotary groove is embedded with a driving motor 4, the output end of the driving motor 4 is fixedly connected with the rotary plate 3, a pair of through holes are formed in the middle of the rotary plate 3, a stirring rod 5 is slidably connected in the through holes, the driving motor 4 drives the rotary plate 3 to integrally rotate, so that the stirring rod 5 automatically stirs to replace manual stirring phase-change materials and furfural to extract oil, the stirring rod 5 comprises a glass rod 51, the glass rod 51 is slidingly connected in the through holes, the upper end of the glass rod 51 is fixedly connected with a heating rod 52, the middle part of the glass rod 51 is fixedly connected with a square magnetic plate 53, asphalt is heated and stirred through the square magnetic plate 53, the receiving cylinder 6 is fixedly connected to the upper end of the rotary plate 3, the accommodating cylinder 6 is communicated with the through hole, the electromagnetic plate 7 is fixedly connected to the upper end of the accommodating cylinder 6, the heating rod 52 is attracted after the electromagnetic plate 7 is electrified, so that the stirring rod 5 is integrally accommodated in the accommodating cylinder 6, the wiping ring 8 is embedded in the through hole, the wiping ring 8 comprises a heat absorbing plate 81, the heat absorbing plate 81 is embedded in the inner wall of the through hole, the thermal expansion bag 82 is fixedly connected to the inner end of the heat absorbing plate 81, the flexible wiping cloth 83 is fixedly connected to the inner end of the thermal expansion bag 82, the square magnetic plate 53 is started to preheat before the asphalt is heated and stirred through the stirring rod 5, the heat absorbing plate 81 absorbs heat and conducts heat to the thermal expansion bag 82 to expand to squeeze the flexible wiping cloth 83, the flexible wiping cloth 83 is tightly attached to the outer end face of the stirring rod 5, the heating rod 52 is repelled by the reverse magnetic force of the electromagnetic plate 7, the stirring rod 5 is moved downwards, residues on the outer surface of the stirring rod 5 are wiped by the flexible wiping cloth 83, the toughness wiping cloth 83 and the glass rod 51 can be rubbed with each other, so that the heat of the stirring rod 5 is sufficient, and the asphalt heating and stirring effects are better and more sufficient.
Example 2:
referring to fig. 1-3, a block copolymer-nanocomposite modified emulsified asphalt and a preparation method thereof, wherein the block copolymer-nanocomposite modified emulsified asphalt comprises modified asphalt and soap solution, and the modified asphalt comprises the following substances in parts by mass: 110 parts of matrix asphalt, 10 parts of thermoplastic rubber modifier, 1 part of phase change material, 1 part of graphene, 2.5 parts of furfural extract oil and 3 parts of petroleum resin; the soap solution comprises the following substances in parts by mass: 100 parts of purified water, 12 parts of emulsifying agent, 1 part of stabilizing agent and 1.5 parts of acid; the weight ratio of the modified asphalt to the soap solution is 1:0.5.
the preparation method comprises the following steps of modified asphalt preparation, soap solution preparation and high-speed shearing emulsification, wherein the modified asphalt preparation comprises an asphalt heating and stirring process, a thermoplastic rubber modifier swelling process, a high-speed shearing dispersion process and a development process, and the detailed preparation steps are as follows:
s1, preprocessing a phase change material: weighing phase-change materials and furfural extract oil according to mass proportion, placing the materials into a stirring device, manually mixing and stirring the materials for 4min by using a glass rod, and standing the materials at normal temperature for 4min to enable the phase-change materials to fully absorb the furfural extract oil;
s2, heating and stirring asphalt: placing the matrix asphalt in an oven, and heating at 135 ℃ for 35min until the matrix asphalt has good fluidity; weighing the mixture obtained by asphalt and S1 according to the mass ratio, mixing the mixture, and mechanically stirring the mixture at 180 ℃ for 12min at the stirring speed of 600rpm/min;
s3, swelling a thermoplastic rubber modifier: raising the stirring temperature in the step S3 to 190 ℃, slowly adding the weighed SBS, SIS, SEBS thermoplastic rubber modifier material into the mixture obtained in the step S2 under the condition of rapid stirring, and keeping the original rotation speed for continuous stirring for 55min so as to enable the thermoplastic rubber modifier to fully absorb light components in asphalt;
s4, high-speed shearing and dispersing: the mechanical stirring equipment in S2 and S3 is replaced by high-speed shearing equipment, the mixture of asphalt, thermoplastic rubber modifier, phase change material and other auxiliary agents obtained in S3 is sheared and dispersed at high speed, the shearing rate is set to 5500rpm/min, high-speed shearing is carried out for 60min, and the temperature is kept unchanged;
s5, development: the high-speed shearing apparatus in S4 was replaced with a mechanical stirring apparatus, and petroleum resin was incorporated into the mixture obtained in S5, and mechanical stirring was performed at a rate of 600rpm/min at a temperature of 190℃for 150min to obtain a modified asphalt.
The soap solution preparation process is as follows:
s1, adding purified water into a heating container, and setting the temperature to 70 ℃;
s2, weighing the emulsifying agent and the stabilizing agent, adding the emulsifying agent and the stabilizing agent into hot water, and mechanically stirring at a stirring speed of 300rpm/min for 40min;
s3, adding an acidic substance in the stirring process to adjust the pH value of the soap solution to 2, and testing once every 8 min.
The high-speed shearing emulsification process adopts a DS-ECM type emulsification tester to carry out the emulsification process of the modified asphalt, and the specific emulsification process is as follows:
s1, setting temperature parameters: the test temperature in the pipeline and the colloid mill is set to 120 ℃, and the weight ratio of the modified asphalt to the soap solution is 1:0.5;
s2, creating an emulsification environment: firstly, injecting soap solution into a pipeline to enable the interior of the pipeline to fully contain the soap solution, so that on one hand, smoothness of the interior of the pipeline is verified, and on the other hand, an emulsified environment is created for asphalt emulsification, and demulsification of asphalt in the emulsification process is avoided;
s3, high-speed shearing and emulsifying: injecting the modified asphalt into a colloid mill, mixing the soap solution and the modified asphalt in the colloid mill, and rapidly shearing, dispersing and emulsifying, wherein the rotating speed of the colloid mill is not lower than 5000rpm/min, and finally obtaining the block copolymer-nano composite modified emulsified asphalt.
Example 3:
referring to fig. 1-3, a block copolymer-nanocomposite modified emulsified asphalt and a preparation method thereof, wherein the block copolymer-nanocomposite modified emulsified asphalt comprises modified asphalt and soap solution, and the modified asphalt comprises the following substances in parts by mass: 120 parts of matrix asphalt, 16 parts of thermoplastic rubber modifier, 2 parts of phase change material, 1.5 parts of graphene, 4 parts of furfural extract oil and 5 parts of petroleum resin; the soap solution comprises the following substances in parts by mass: 100 parts of purified water, 20 parts of emulsifying agent, 2 parts of stabilizing agent and 3 parts of acid; the weight ratio of the modified asphalt to the soap solution is 1:0.7.
the preparation method comprises the following steps of modified asphalt preparation, soap solution preparation and high-speed shearing emulsification, wherein the modified asphalt preparation comprises an asphalt heating and stirring process, a thermoplastic rubber modifier swelling process, a high-speed shearing dispersion process and a development process, and the detailed preparation steps are as follows:
s1, preprocessing a phase change material: weighing phase-change materials and furfural extract oil according to mass proportion, placing the materials into a stirring device, manually mixing and stirring the materials for 5min by using a glass rod, and standing the materials at normal temperature for 5min to enable the phase-change materials to fully absorb the furfural extract oil;
s2, heating and stirring asphalt: placing the matrix asphalt in an oven, and heating at 135 ℃ for 40min until the matrix asphalt has good fluidity; weighing the mixture obtained by asphalt and S1 according to the mass ratio, mixing the mixture, and mechanically stirring the mixture at 180 ℃ for 15min at the stirring speed of 600rpm/min;
s3, swelling a thermoplastic rubber modifier: raising the stirring temperature in the step S3 to 190 ℃, slowly adding the weighed SBS, SIS, SEBS thermoplastic rubber modifier material into the mixture obtained in the step S2 under the condition of rapid stirring, and keeping the original rotation speed for continuously stirring for 60 minutes so that the thermoplastic rubber modifier fully absorbs light components in the asphalt;
s4, high-speed shearing and dispersing: the mechanical stirring equipment in S2 and S3 is replaced by high-speed shearing equipment, the mixture of asphalt, thermoplastic rubber modifier, phase change material and other auxiliary agents obtained in S3 is sheared and dispersed at high speed, the shearing rate is set to 5500rpm/min, the high-speed shearing is carried out for 90min, and the temperature is kept unchanged;
s5, development: the high-speed shearing apparatus in S4 was replaced with a mechanical stirring apparatus, and petroleum resin was incorporated into the mixture obtained in S5, and mechanical stirring was performed at a rate of 600rpm/min for 180min at a temperature of 190℃to obtain a modified asphalt.
The soap solution preparation process is as follows:
s1, adding purified water into a heating container, and setting the temperature to 70 ℃;
s2, weighing the emulsifying agent and the stabilizing agent, adding the emulsifying agent and the stabilizing agent into hot water, and mechanically stirring at the stirring speed of 450rpm/min for 60min;
s3, adding an acidic substance in the stirring process to adjust the pH value of the soap solution to 2.5, and testing every 10 min.
The high-speed shearing emulsification process adopts a DS-ECM type emulsification tester to carry out the emulsification process of the modified asphalt, and the specific emulsification process is as follows:
s1, setting temperature parameters: the test temperature in the pipeline and the colloid mill is set to 200 ℃, and the weight ratio of the modified asphalt to the soap solution is 1:0.7;
s2, creating an emulsification environment: firstly, injecting soap solution into a pipeline to enable the interior of the pipeline to fully contain the soap solution, so that on one hand, smoothness of the interior of the pipeline is verified, and on the other hand, an emulsified environment is created for asphalt emulsification, and demulsification of asphalt in the emulsification process is avoided;
s3, high-speed shearing and emulsifying: injecting the modified asphalt into a colloid mill, mixing the soap solution and the modified asphalt in the colloid mill, and rapidly shearing, dispersing and emulsifying, wherein the rotating speed of the colloid mill is not lower than 5000rpm/min, and finally obtaining the block copolymer-nano composite modified emulsified asphalt.
Referring to FIG. 8, the main performance index test results of the block copolymer-nanocomposite modified emulsified asphalt of example 1 are shown.
The technical scheme shows that the invention has the following beneficial effects:
the scheme adopts a preparation process of modifying before emulsifying so as to improve the mixing amount of thermoplastic rubber modified materials, thereby being beneficial to improving the high-low temperature performance, the viscous toughness performance and the like of the emulsified asphalt evaporation residues; in addition, series of phase change materials and petroleum resin are innovatively doped, so that the compatibility of the modifier and asphalt is improved, meanwhile, the emulsified asphalt can perfectly fit the technical scheme of synchronous paving construction mode, such as super-adhesive finishing surface and novel curing technology of thin or ultrathin coating surface, so that the adhesive property is improved for a thin layer, the falling-off disease is avoided, and the emulsified asphalt has extremely high economic value.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment contains only one independent technical solution, and that such description is provided for clarity only, and that the technical solutions of the embodiments may be appropriately combined to form other embodiments that will be understood by those skilled in the art.
Claims (10)
1. A block copolymer-nano composite modified emulsified asphalt is characterized in that: the modified asphalt comprises modified asphalt and soap liquid, wherein the modified asphalt comprises the following substances in parts by mass: 100-120 parts of matrix asphalt, 6-16 parts of thermoplastic rubber modifier, 0.5-2 parts of phase change material, 0.3-1.5 parts of graphene, 1-4 parts of furfural extract oil and 1-5 parts of petroleum resin; the soap solution comprises the following substances in parts by mass: 100 parts of purified water, 5-20 parts of emulsifying agent, 0.1-2 parts of stabilizing agent and 0.1-3 parts of acid; the weight ratio of the modified asphalt to the soap solution is 1:0.2-0.7.
2. The block copolymer-nanocomposite modified emulsified asphalt according to claim 1, wherein: the matrix asphalt is any one of 70# matrix asphalt, 90# matrix asphalt and 110# matrix asphalt.
3. The block copolymer-nanocomposite modified emulsified asphalt according to claim 1, wherein: the thermoplastic rubber modifier is one or a mixture of a plurality of styrene-butadiene-styrene block copolymers, styrene-isoprene-styrene block copolymers and styrene-ethylene-butylene-styrene block copolymers.
4. The block copolymer-nanocomposite modified emulsified asphalt according to claim 1, wherein: the phase change material is one or a mixture of more of nano CaCO3, nano clay and carbon nano tubes.
5. The block copolymer-nanocomposite modified emulsified asphalt according to claim 1, wherein: the petroleum resin is one or a mixture of more than one of C5 petroleum resin and C9 petroleum resin.
6. The block copolymer-nanocomposite modified emulsified asphalt according to claim 1, wherein: the emulsifier is a quick-cracking type emulsifier, the quick-cracking type emulsifier is a mixture of an amine derivative and an ammonium salt, the stabilizer is anhydrous chloride salt and is any one of sodium chloride, potassium chloride, calcium chloride, magnesium chloride and ferric chloride, and the acid is any one of hydrochloric acid, sulfuric acid and nitric acid.
7. The method for preparing the block copolymer-nanocomposite modified emulsified asphalt according to claim 1, wherein: the preparation method comprises the following steps of modified asphalt preparation, soap liquid preparation and high-speed shearing emulsification, wherein the modified asphalt preparation comprises an asphalt heating and stirring process, a thermoplastic rubber modifier swelling process, a high-speed shearing dispersion process and a development process, and the detailed preparation steps are as follows:
s1, preprocessing a phase change material: weighing phase-change materials and furfural extract oil according to mass proportion, placing the materials into a stirring device, manually mixing and stirring the materials for 3-5min by using a glass rod, and standing the materials at normal temperature for 3-5min to enable the phase-change materials to fully absorb the furfural extract oil;
s2, heating and stirring asphalt: placing matrix asphalt in an oven, and heating at 135 ℃ for 30-40min until the matrix asphalt has good fluidity; weighing asphalt and the mixture obtained by S1 according to the mass ratio, mixing the asphalt and the mixture, and mechanically stirring the mixture at 180 ℃ for 10-15min at the stirring speed of 600rpm/min;
s3, swelling a thermoplastic rubber modifier: raising the stirring temperature in the step S3 to 190 ℃, slowly adding the weighed SBS, SIS, SEBS thermoplastic rubber modifier material into the mixture obtained in the step S2 under the condition of rapid stirring, and keeping the original rotation speed for continuous stirring for 45-60min so that the thermoplastic rubber modifier fully absorbs light components in the asphalt;
s4, high-speed shearing and dispersing: the mechanical stirring equipment in S2 and S3 is replaced by high-speed shearing equipment, the mixture of asphalt, thermoplastic rubber modifier, phase change material and other auxiliary agents obtained in S3 is sheared and dispersed at high speed, the shearing rate is set to 5500rpm/min, the high-speed shearing is carried out for 30-90min, and the temperature is kept unchanged;
s5, development: the high-speed shearing apparatus in S4 was replaced with a mechanical stirring apparatus, and petroleum resin was incorporated into the mixture obtained in S5, and mechanical stirring was performed at a rate of 600rpm/min at a temperature of 190℃for 120-180min to obtain a modified asphalt.
8. The method for preparing the block copolymer-nanocomposite modified emulsified asphalt according to claim 7, wherein: the soap solution preparation process is as follows:
s1, adding purified water into a heating container, and setting the temperature to 70 ℃;
s2, weighing the emulsifying agent and the stabilizing agent, adding the emulsifying agent and the stabilizing agent into hot water, and mechanically stirring at a stirring speed of 150-450rpm/min for 15-60min;
s3, adding an acidic substance in the stirring process to adjust the pH value of the soap solution to be 1.5-2.5, and testing once every 5-10 min.
9. The method for preparing the block copolymer-nanocomposite modified emulsified asphalt according to claim 7, wherein: the high-speed shearing emulsification process adopts a DS-ECM type emulsification testing machine to carry out the emulsification process of the modified asphalt, and the specific emulsification process is as follows:
s1, setting temperature parameters: the test temperature in the pipeline and the colloid mill is set to be 60-200 ℃, and the weight ratio of the modified asphalt to the soap solution is 1:0.2-0.7;
s2, creating an emulsification environment: firstly, injecting soap solution into a pipeline to enable the interior of the pipeline to fully contain the soap solution, so that on one hand, smoothness of the interior of the pipeline is verified, and on the other hand, an emulsified environment is created for asphalt emulsification, and demulsification of asphalt in the emulsification process is avoided;
s3, high-speed shearing and emulsifying: injecting the modified asphalt into a colloid mill, mixing the soap solution and the modified asphalt in the colloid mill, and rapidly shearing, dispersing and emulsifying, wherein the rotating speed of the colloid mill is not lower than 5000rpm/min, and finally obtaining the block copolymer-nano composite modified emulsified asphalt.
10. The method for preparing the block copolymer-nanocomposite modified emulsified asphalt according to claim 7, wherein: the stirring device comprises:
the stirring device comprises a stirring cylinder (1), wherein the upper end of the stirring cylinder (1) is fixedly connected with a cylinder sealing cover (2), a rotary groove is formed in the middle of the lower end of the cylinder sealing cover (2), a rotary plate (3) is rotationally connected in the rotary groove, a driving motor (4) is embedded in the inner wall of the rotary groove, the output end of the driving motor (4) is fixedly connected with the rotary plate (3), a pair of through holes are formed in the middle of the rotary plate (3), and stirring rods (5) are slidably connected in the through holes;
the stirring rod (5) comprises a glass rod (51), the glass rod (51) is connected in the through hole in a sliding mode, a heating rod (52) is fixedly connected to the upper end of the glass rod (51), and a square magnetic plate (53) is fixedly connected to the middle inside of the glass rod (51);
the accommodating cylinder (6), the accommodating cylinder (6) is fixedly connected to the upper end of the rotating plate (3), the accommodating cylinder (6) is communicated with the through hole, the electromagnetic plate (7) is fixedly connected to the upper end of the accommodating cylinder (6), and the wiping ring (8) is embedded in the through hole;
the wiping ring (8) comprises a heat absorbing plate (81), the heat absorbing plate (81) is inlaid on the inner wall of the through hole, a thermal expansion bag (82) is fixedly connected inside the heat absorbing plate (81), and a tough wiping cloth (83) is fixedly connected at the inner end of the thermal expansion bag (82).
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