CN111234548A - SBS modified asphalt - Google Patents
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- CN111234548A CN111234548A CN202010251692.2A CN202010251692A CN111234548A CN 111234548 A CN111234548 A CN 111234548A CN 202010251692 A CN202010251692 A CN 202010251692A CN 111234548 A CN111234548 A CN 111234548A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L95/00—Compositions of bituminous materials, e.g. asphalt, tar, pitch
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/02—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type
- B29B7/06—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices
- B29B7/10—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary
- B29B7/12—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary with single shaft
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/02—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type
- B29B7/22—Component parts, details or accessories; Auxiliary operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/74—Mixing; Kneading using other mixers or combinations of mixers, e.g. of dissimilar mixers ; Plant
- B29B7/7466—Combinations of similar mixers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/80—Component parts, details or accessories; Auxiliary operations
- B29B7/88—Adding charges, i.e. additives
- B29B7/94—Liquid charges
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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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/32—Phosphorus-containing compounds
- C08K2003/329—Phosphorus containing acids
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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Abstract
The invention belongs to the technical field of road building materials, and particularly relates to SBS modified asphalt which comprises 30 parts of matrix asphalt, 10 parts of modifier, 1 part of polyphosphoric acid, 4 parts of compatilizer, 3 parts of stabilizer, 20 parts of auxiliary material, 17 parts of high aromatic hydrocarbon organic solvent, 10 parts of rubber oil and 5 parts of ultraviolet absorbent; the auxiliary material is a mixture of polyvinyl alcohol sodium amide, a sodium carboxymethylcellulose compound, polyoxyethylene ether, sodium tripolyphosphate and sodium tetraborate; the matrix asphalt is mixed asphalt formed by straight-run asphalt and oxidized asphalt; the modifier is SBS pitch modifier, RET pitch modifier and SBR pitch modifier according to the proportion of 3: 1: 1, mixing the raw materials in a ratio; the invention is mainly used for providing the SBS modified asphalt, the SBS modified asphalt is chemically stable SBS modified asphalt, the high temperature performance and the anti-rutting performance are good, and the thermal stability of the SBS modified asphalt is better than that of the traditional SBS modified asphalt.
Description
Technical Field
The invention belongs to the technical field of road building materials, and particularly relates to SBS modified asphalt.
Background
The SBS modified asphalt is prepared with base asphalt as material and through adding SBS modifier in certain proportion, shearing, stirring and other steps to disperse SBS in asphalt, meanwhile, a certain proportion of special stabilizer is added to form SBS blending material, and the good physical properties of SBS are utilized to modify the asphalt, so that the most common traditional SBS modified asphalt at present can obviously improve the properties of asphalt such as high temperature, low temperature, fatigue and aging resistance, and can comprehensively improve the performance of asphalt, therefore, the SBS blending material is widely used all over the world, the modification process, the construction process and the quality monitoring are also quite mature, and the detailed introduction of the SBS modified asphalt can refer to the SBS modified asphalt temperature sensitivity index research, which is recorded in the building materials journal, the Classification number of which is U414, of the Changan university college of materials science and engineering academy, however, the traditional SBS modified asphalt still has the following problems in the actual engineering:
(1) the SBS asphalt modifier has higher price, and the better modification effect can be achieved only when the mixing amount reaches a certain degree; secondly, the requirements on modification equipment and a modification process are high, the requirements are mainly expressed as core equipment-colloid mill, China cannot produce colloid mills meeting the requirements in the past years, the equipment can be imported from foreign countries, and the patent technology is monopolized by foreign large manufacturers, so that the equipment is high in price, and the later equipment maintenance is a great problem;
(2) at present, although colloid mills with better performance can be produced in China, the colloid mills have various market varieties and different quality, and the equipment of different manufacturers has different differences, so that the modification process is different, and the production quality of modified asphalt is greatly influenced; as for the industrial mass production of polymer modified asphalt, the method can better ensure the quality of asphalt, but in practical engineering, the construction site is relatively far away from the factory, and long-distance transportation of special vehicles is required when the modified asphalt reaches the use site, which undoubtedly increases the road construction cost.
In view of this, in order to overcome the above technical problems, the present applicant has designed and developed a novel SBS modified asphalt, and adopted a special manufacturing method and product structure to solve the above technical problems.
Disclosure of Invention
In order to make up the defects of the prior art, the invention provides SBS modified asphalt. The invention is mainly used for providing the SBS modified asphalt, the SBS modified asphalt is chemically stable SBS modified asphalt, the high temperature performance and the anti-rutting performance are good, and the thermal stability of the SBS modified asphalt is better than that of the traditional SBS modified asphalt.
The technical scheme adopted by the invention for solving the technical problems is as follows: the SBS modified asphalt comprises 30 parts of the following matrix asphalt, 10 parts of a modifier, 1 part of polyphosphoric acid, 4 parts of a compatilizer, 3 parts of a stabilizer, 20 parts of auxiliary materials, 17 parts of a high aromatic hydrocarbon organic solvent, 10 parts of rubber oil and 5 parts of an ultraviolet absorbent;
the auxiliary material is a mixture of polyvinyl alcohol sodium amide, a sodium carboxymethylcellulose compound, polyoxyethylene ether, sodium tripolyphosphate and sodium tetraborate; the matrix asphalt is mixed asphalt formed by straight-run asphalt and oxidized asphalt.
The modifier is SBS pitch modifier, RET pitch modifier and SBR pitch modifier according to the proportion of 3: 1: 1, the RET asphalt modifier can improve the fatigue life of the matrix asphalt, improve the high-temperature rutting resistance, stripping resistance, low-temperature cracking resistance and the like, improve the storage stability of the asphalt and is beneficial to the mass production and repeated heating use of SBS modified asphalt; the SBR asphalt modifier is latex, can effectively prevent the SBS asphalt modifier and the RET asphalt modifier from precipitating in the storage process, and can reduce the modification effect, thereby saving the cost and simultaneously enhancing the modification effect of the modifier.
The ultraviolet absorbent is a mixed product of 2, 4-dihydroxy benzophenone and hindered amine mixed according to a mass ratio of 1: 2.
The SBS modified asphalt comprises the following preparation steps:
s1: the modifier is prepared into a flaky or powdery shape, the flaky or powdery modifier is dissolved in the high aromatic hydrocarbon organic solvent, the flaky or powdery modifier is fully dissolved in the high aromatic hydrocarbon organic solvent by stirring to obtain a mixed modified solution, and the flaky or powdery modifier is dissolved in the high aromatic hydrocarbon organic solvent, so that the modifier can be uniformly dispersed in the high aromatic hydrocarbon organic solvent, the action force of the modifier is effectively improved, and the fluidity of the modifier is enhanced;
s2: the base asphalt is placed into a container and heated to 180-200 ℃, then the auxiliary material, the rubber oil, the compatilizer, the stabilizer and the ultraviolet absorbent are sequentially added under the sealed condition and stirred for 30 minutes to obtain a mixed material, when the base asphalt is in an emulsion state at a high temperature, the base asphalt is mixed with the compatilizer and stirred, so that the rubber oil, the compatilizer, the stabilizer and the ultraviolet absorbent can be rapidly mixed into the auxiliary material and the base asphalt at the high temperature, the reaction time is greatly shortened, the glue oil, the compatilizer, the stabilizer and the ultraviolet absorbent are uniformly distributed, the phenomenon that partial auxiliary material and the base asphalt are not reacted sufficiently is avoided, and the quality of a finished product is seriously influenced;
s3: adding the mixed modified liquid obtained in S1 into the mixed material under sealed condition, controlling the temperature between 160 ℃ and 170 ℃, stirring for 30 minutes, keeping the container in a sealed state during the process from the beginning to the 15 minutes of stirring, opening the container after the 15 minutes of stirring, keeping the container in an open state, stirring for 30 minutes to obtain a base material, wherein the obtained base material is viscous, heating and stirring under the initially sealed condition can evaporate water in the mixed modified liquid, and form a large amount of water vapor in the container, so as to enhance the effect of the pressure in the container, and under the condition that the pressure in the container rises, rubber oil, a compatilizer, a stabilizer, an ultraviolet absorbent and a modifier can be fully blended into the base asphalt and the auxiliary materials, so as to accelerate the production of a finished product, and simultaneously, when the pressure in the container is kept in an open state in the later period of stirring, the pressure in the container can be instantly lowered, the matrix asphalt and the auxiliary materials are rapidly converted under the high-pressure and normal-pressure states, so that the matrix asphalt and the auxiliary materials are instantly fluffy, the speed of blending the rubber oil, the compatilizer, the stabilizer, the ultraviolet absorbent and the modifier into the matrix asphalt and the auxiliary materials is further increased, and the distribution uniformity of the rubber oil, the compatilizer, the stabilizer, the ultraviolet absorbent and the modifier in the matrix asphalt and the auxiliary materials is improved;
s4: putting the base material obtained in the step S3 into a shearing machine for shearing, and adding polyphosphoric acid into the base material through a shearing machine in the shearing process to obtain a semi-finished product; by adopting polyphosphoric acid (PPA), a RET asphalt modifier, an SBR asphalt modifier and an SBS asphalt modifier to be compounded to serve as modification components, the using amount of the SBS asphalt modifier can be reduced, the production cost of the SBS modified asphalt is reduced, the stability of the SBS modified asphalt is obviously improved, and the occurrence of segregation is avoided;
s5: stirring the semi-finished product obtained in the step S4 for 50 minutes at the temperature of 200 ℃ to obtain SBS modified asphalt; the polyphosphoric acid is mixed into the base material in the shearing process of the shearing machine to obtain a semi-finished product, and then the semi-finished product is stirred for 50 minutes at 200 ℃, so that the polyphosphoric acid and the base material can be further uniformly mixed, the quality of the produced SBS modified asphalt is further ensured, and the aim of saving the cost is indirectly achieved.
The shearing machine comprises a machine body and a shearing rod; the shearing rod is rotatably arranged at the lower end of the machine body, and the outer wall of the shearing rod is uniformly and fixedly provided with the diffusion rings; the outer surface of the diffusion ring is elastically connected with a sealing ring in a sliding way, and the diffusion ring is communicated with the spiral groove; a liquid leakage hole is formed in the sealing ring, and the liquid leakage hole in the sealing ring and the liquid leakage hole of the diffusion ring can be mutually overlapped along with the rotation of the sealing ring; the spiral groove is formed in the shearing rod, the outer end of the spiral groove is smaller in aperture than the inner end of the spiral groove, and the inner end of the spiral groove is communicated with the diversion groove; the shunting grooves are uniformly formed in the middle of the shearing rod, the shunting grooves are communicated, and polyphosphoric acid is filled in the shunting grooves; when the shearing machine shears the mixed material, namely the mixed material is sheared through the rotation of the shearing rod, when the shearing rod starts to rotate, the motion speed of the sealing ring is smaller than that of the shearing rod body due to the power action, so that differential speed is formed between the sealing ring and the shearing rod body, namely the sealing ring rotates in a small range, so that liquid leakage holes between the sealing ring and the shearing rod body are opposite, polyphosphoric acid is input into a diversion channel inside the shearing rod at the moment, namely the polyphosphoric acid enters the diffusion ring through a spiral groove and enters the mixed material through the liquid leakage holes, and the outer end hole diameter of the spiral groove is smaller than that of the inner end, namely the polyphosphoric acid is accelerated when passing through the spiral groove, so that the polyphosphoric acid sprayed out from the liquid leakage holes is in an acceleration state and can be uniformly impacted into the mixed material, thereby better mixing effect is realized, and simultaneously, the polyphosphoric acid can move more intensely in the mixed material, the shearing effect of the mixed materials can be greatly promoted, so that the modification effect of the asphalt is greatly improved.
The size of the cavity of the splitter box is sequentially set from top to bottom from big to small; when polyphosphoric acid is in transportation process, cavity size from the top down sets gradually to from big to little because of the splitter box, polyphosphoric acid can be in the acceleration state gradually when flowing in the splitter box promptly, and the acceleration effect of lower extreme is stronger, thereby it is faster to make the shearing rod more toward the polyphosphoric acid acceleration that the diffusion tank of lower extreme diffused, and mutually support with the helicla flute and make the polyphosphoric acid of lower extreme accelerate the effect strongest, because of polyphosphoric acid's quality is great, even the acceleration of polyphosphoric acid lower extreme is the biggest when the blowout, can effectively improve the mixture of polyphosphoric acid and mixed material, can make the polyphosphoric acid of lower extreme be in active state constantly simultaneously, avoid taking place the sediment and be unfavorable for going on of mixing.
The invention has the following beneficial effects:
1. according to the invention, polyphosphoric acid (PPA) and RET asphalt modifier are compounded with SBS asphalt modifier to serve as modification components, so that the using amount of SBS asphalt modifier can be reduced, the production cost of SBS modified asphalt is reduced, the stability of SBS modified asphalt is obviously increased, the occurrence of segregation is avoided, meanwhile, the SBR asphalt modifier is emulsion-shaped, the phenomenon that the SBS asphalt modifier and RET asphalt modifier precipitate in the storage process can be effectively prevented, the modification effect is reduced, the cost is saved, and the modification effect of the modifier is enhanced.
2. The SBS modified asphalt of the invention can generate chemical reaction with the matrix asphalt through the chemical modifier, rather than simple physical blending, so that stable chemical bond connection can be formed between the matrix asphalt and the chemical modifier, the asphalt colloid structure is changed, and the performance of the asphalt is comprehensively improved.
3. The PPA adopted by the invention has a catalytic function while playing a role in chemical modification, has a good price advantage, has a low price of raw materials which is only half of the price of the SBS modifier, has a small mixing amount which is generally not more than 1.5 percent of the mass of the matrix asphalt and is far lower than the SBS modifier, and can improve the performance of the SBS modified asphalt and reduce the preparation cost by replacing part of the SBS asphalt modifier with the PPA and RET asphalt modifiers.
4. According to the invention, the shearing machine is adopted to shear the mixed material through the rotation of the shearing rod, the movement speed of the sealing ring is smaller than that of the shearing rod body, so that a differential speed is formed between the shearing rod body and the shearing rod body, namely the sealing ring can rotate in a small range, so that the liquid leakage holes between the shearing rod body and the shearing rod body are opposite, polyphosphoric acid is input into the diversion channel in the shearing rod, so that the polyphosphoric acid can enter the diffusion ring through the spiral groove and enter the mixed material through the liquid leakage holes, and the polyphosphoric acid sprayed out of the liquid leakage holes is in an acceleration state due to the fact that the aperture of the outer end of the spiral groove is smaller than that of the inner end of the spiral groove, namely the polyphosphoric acid can be accelerated when passing through the spiral groove, so that the polyphosphoric acid can uniformly impact the mixed material, thereby realizing a better mixing, the shearing effect of the mixed materials can be greatly promoted, so that the modification effect of the asphalt is greatly improved.
Drawings
FIG. 1 is a diagram of the method steps of the present invention;
FIG. 2 is a schematic diagram of the construction of the shear of the present invention;
FIG. 3 is a schematic diagram of the construction of a shear bar of the present invention;
in the figure: the device comprises a machine body 1, a shearing rod 2, a diffusion ring 3, a sealing ring 4, a spiral groove 5, a liquid leakage hole 6 and a flow dividing groove 7.
Detailed Description
An SBS-modified asphalt according to an embodiment of the present invention will be described below with reference to fig. 1 to 3.
As shown in fig. 1-3, the SBS modified asphalt of the present invention comprises the following components in parts by weight:
30 parts of matrix asphalt, 10 parts of modifier, 1 part of polyphosphoric acid, 4 parts of compatilizer, 3 parts of stabilizer, 20 parts of auxiliary material, 17 parts of high aromatic hydrocarbon organic solvent, 10 parts of rubber oil and 5 parts of ultraviolet absorbent;
the auxiliary material is a mixture of polyvinyl alcohol sodium amide, a sodium carboxymethylcellulose compound, polyoxyethylene ether, sodium tripolyphosphate and sodium tetraborate; the matrix asphalt is mixed asphalt formed by straight-run asphalt and oxidized asphalt.
The modifier is SBS pitch modifier, RET pitch modifier and SBR pitch modifier according to the proportion of 3: 1: 1, the RET asphalt modifier can improve the fatigue life of the matrix asphalt, improve the high-temperature rutting resistance, stripping resistance, low-temperature cracking resistance and the like, improve the storage stability of the asphalt and is beneficial to the mass production and repeated heating use of SBS modified asphalt; the SBR asphalt modifier is latex, can effectively prevent the SBS asphalt modifier and the RET asphalt modifier from precipitating in the storage process, and can reduce the modification effect, thereby saving the cost and simultaneously enhancing the modification effect of the modifier.
The ultraviolet absorbent is a mixed product of 2, 4-dihydroxy benzophenone and hindered amine mixed according to a mass ratio of 1: 2.
The SBS modified asphalt comprises the following preparation steps:
s1: the modifier is prepared into a flaky or powdery shape, the flaky or powdery modifier is dissolved in the high aromatic hydrocarbon organic solvent, the flaky or powdery modifier is fully dissolved in the high aromatic hydrocarbon organic solvent by stirring to obtain a mixed modified solution, and the flaky or powdery modifier is dissolved in the high aromatic hydrocarbon organic solvent, so that the modifier can be uniformly dispersed in the high aromatic hydrocarbon organic solvent, the action force of the modifier is effectively improved, and the fluidity of the modifier is enhanced;
s2: the base asphalt is placed into a container and heated to 180-200 ℃, then the auxiliary material, the rubber oil, the compatilizer, the stabilizer and the ultraviolet absorbent are sequentially added under the sealed condition and stirred for 30 minutes to obtain a mixed material, when the base asphalt is in an emulsion state at a high temperature, the base asphalt is mixed with the compatilizer and stirred, so that the rubber oil, the compatilizer, the stabilizer and the ultraviolet absorbent can be rapidly mixed into the auxiliary material and the base asphalt at the high temperature, the reaction time is greatly shortened, the glue oil, the compatilizer, the stabilizer and the ultraviolet absorbent are uniformly distributed, the phenomenon that partial auxiliary material and the base asphalt are not reacted sufficiently is avoided, and the quality of a finished product is seriously influenced;
s3: adding the mixed modified liquid obtained in S1 into the mixed material under sealed condition, controlling the temperature between 160 ℃ and 170 ℃, stirring for 30 minutes, keeping the container in a sealed state during the process from the beginning to the 15 minutes of stirring, opening the container after the 15 minutes of stirring, keeping the container in an open state, stirring for 30 minutes to obtain a base material, wherein the obtained base material is viscous, heating and stirring under the initially sealed condition can evaporate water in the mixed modified liquid, and form a large amount of water vapor in the container, so as to enhance the effect of the pressure in the container, and under the condition that the pressure in the container rises, rubber oil, a compatilizer, a stabilizer, an ultraviolet absorbent and a modifier can be fully blended into the base asphalt and the auxiliary materials, so as to accelerate the production of a finished product, and simultaneously, when the pressure in the container is kept in an open state in the later period of stirring, the pressure in the container can be instantly lowered, the matrix asphalt and the auxiliary materials are rapidly converted under the high-pressure and normal-pressure states, so that the matrix asphalt and the auxiliary materials are instantly fluffy, the speed of blending the rubber oil, the compatilizer, the stabilizer, the ultraviolet absorbent and the modifier into the matrix asphalt and the auxiliary materials is further increased, and the distribution uniformity of the rubber oil, the compatilizer, the stabilizer, the ultraviolet absorbent and the modifier in the matrix asphalt and the auxiliary materials is improved;
s4: putting the base material obtained in the step S3 into a shearing machine for shearing, and adding polyphosphoric acid into the base material through a shearing machine in the shearing process to obtain a semi-finished product; by adopting polyphosphoric acid (PPA), a RET asphalt modifier, an SBR asphalt modifier and an SBS asphalt modifier to be compounded to serve as modification components, the using amount of the SBS asphalt modifier can be reduced, the production cost of the SBS modified asphalt is reduced, the stability of the SBS modified asphalt is obviously improved, and the occurrence of segregation is avoided;
s5: stirring the semi-finished product obtained in the step S4 for 50 minutes at the temperature of 200 ℃ to obtain SBS modified asphalt; the polyphosphoric acid is mixed into the base material in the shearing process of the shearing machine to obtain a semi-finished product, and then the semi-finished product is stirred for 50 minutes at 200 ℃, so that the polyphosphoric acid and the base material can be further uniformly mixed, the quality of the produced SBS modified asphalt is further ensured, and the aim of saving the cost is indirectly achieved.
The shearing machine comprises a machine body 1 and a shearing rod 2; the shearing rod 2 is rotatably arranged at the lower end of the machine body 1, and the diffusion rings 3 are uniformly and fixedly arranged in the outer wall of the shearing rod 2; the outer surface of the diffusion ring 3 is elastically connected with a sealing ring 4 in a sliding way, and the diffusion ring 3 is communicated with the spiral groove 5; a liquid leakage hole 6 is formed in the sealing ring 4, and the liquid leakage hole 6 in the sealing ring 4 and the liquid leakage hole 6 of the diffusion ring 3 can be mutually overlapped along with the rotation of the sealing ring 4; the spiral groove 5 is formed in the shearing rod 2, the outer end of the spiral groove 5 is smaller in hole diameter than the inner end of the spiral groove, and the inner end of the spiral groove 5 is communicated with the diversion groove 7; the distributing chutes 7 are uniformly arranged in the middle of the shearing rod 2, the distributing chutes 7 are communicated with each other, and polyphosphoric acid is filled in the distributing chutes 7; when the shearing machine shears the mixed material, namely the mixed material is sheared through the rotation of the shearing rod 2, when the shearing rod 2 starts to rotate, the motion speed of the sealing ring 4 is smaller than that of the shearing rod 2 due to the power action, so that differential speed is formed between the sealing ring and the shearing rod 2, namely the sealing ring 4 rotates in a small range, the liquid leakage holes 6 between the sealing ring and the shearing rod are opposite, polyphosphoric acid is input into the shunting groove 7 in the shearing rod 2 at the moment, namely the polyphosphoric acid enters the diffusion ring 3 through the spiral groove 5 and enters the mixed material through the liquid leakage holes 6, the outer end hole diameter of the spiral groove 5 is smaller than the inner end of the spiral groove 5, namely the polyphosphoric acid is accelerated when passing through the spiral groove 5, so that the polyphosphoric acid sprayed out of the liquid leakage holes 6 is in an accelerated state and can uniformly impact the mixed material, thereby realizing better mixing effect, and simultaneously utilizing the reason that the mass of the polyphosphoric, the polyphosphoric acid can move more violently in the mixed material, the shearing effect of the mixed material can be greatly promoted, and the modification effect obtained by the asphalt is greatly improved.
The size of the cavity of the shunting groove 7 is sequentially set from top to bottom; when polyphosphoric acid is in transportation process, from the top down sets gradually to from big to little because of the cavity size of splitter box 7, polyphosphoric acid can be in the acceleration state gradually when flowing in splitter box 7 promptly, and the acceleration effect of lower extreme is stronger, thereby make shearing stick 2 more fast toward the polyphosphoric acid acceleration that the diffusion tank of lower extreme effused, and mutually support with spiral groove 5 and make the polyphosphoric acid of lower extreme accelerate the effect strongest, because of polyphosphoric acid's quality is great, even the acceleration of polyphosphoric acid lower extreme is the biggest when spouting, can effectively improve the mixture of polyphosphoric acid and mixed material, can make the polyphosphoric acid of lower extreme be in the active state constantly simultaneously, avoid taking place the sediment and be unfavorable for going on of mixing.
The specific working process is as follows:
when the shearing machine shears the mixed material, namely the mixed material is sheared through the rotation of the shearing rod 2, when the shearing rod 2 starts to rotate, the motion speed of the sealing ring 4 is smaller than that of the shearing rod 2 due to the power action, so that differential speed is formed between the sealing ring and the shearing rod 2, namely the sealing ring 4 rotates in a small range, the liquid leakage holes 6 between the sealing ring and the shearing rod are opposite, polyphosphoric acid is input into the shunting groove 7 in the shearing rod 2 at the moment, namely the polyphosphoric acid enters the diffusion ring 3 through the spiral groove 5 and enters the mixed material through the liquid leakage holes 6, the outer end hole diameter of the spiral groove 5 is smaller than the inner end of the spiral groove 5, namely the polyphosphoric acid is accelerated when passing through the spiral groove 5, so that the polyphosphoric acid sprayed out of the liquid leakage holes 6 is in an accelerated state and can uniformly impact the mixed material, thereby realizing better mixing effect, and simultaneously utilizing the reason that the mass of the polyphosphoric, can ensure that the polyphosphoric acid moves more violently in the mixed material, can greatly promote the shearing effect of the mixed material, greatly improves the modification effect of the asphalt, when the polyphosphoric acid is conveyed, as the size of the cavity of the shunting groove 7 is set from top to bottom in turn from big to small, that is, the polyphosphoric acid is gradually in an accelerated state when flowing in the diversion trench 7, and the stronger the acceleration effect of the lowest end is, so that the acceleration of the polyphosphoric acid diffused from the shearing rod 2 to the diffusion groove at the lower end is faster, and the polyphosphoric acid at the lowest end has the strongest acceleration effect by being matched with the spiral groove 5, and because the mass of the polyphosphoric acid is larger, even if the acceleration of the polyphosphoric acid at the lower end is the maximum when the polyphosphoric acid is sprayed out, the mixing of the polyphosphoric acid and the mixed material can be effectively improved, meanwhile, the polyphosphoric acid at the lower end can be in an active state all the time, and the phenomenon that precipitation is unfavorable for mixing is avoided.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (6)
1. The SBS modified asphalt is characterized in that: comprises the following components in parts by weight:
30 parts of matrix asphalt, 10 parts of modifier, 1 part of polyphosphoric acid, 4 parts of compatilizer, 3 parts of stabilizer, 20 parts of auxiliary material, 17 parts of high aromatic hydrocarbon organic solvent, 10 parts of rubber oil and 5 parts of ultraviolet absorbent;
the auxiliary material is a mixture of polyvinyl alcohol sodium amide, a sodium carboxymethylcellulose compound, polyoxyethylene ether, sodium tripolyphosphate and sodium tetraborate; the matrix asphalt is mixed asphalt formed by straight-run asphalt and oxidized asphalt.
2. The SBS modified asphalt of claim 1, wherein: the modifier is SBS pitch modifier, RET pitch modifier and SBR pitch modifier according to the proportion of 3: 1: 1 part of the mixed product.
3. The SBS modified asphalt of claim 1, wherein: the ultraviolet absorbent is a mixed product of 2, 4-dihydroxy benzophenone and hindered amine mixed according to a mass ratio of 1: 2.
4. The SBS modified asphalt of claim 1, wherein: the SBS modified asphalt comprises the following preparation steps:
s1: preparing a modifying agent into a flaky or powdery modifying agent, dissolving the flaky or powdery modifying agent in a high aromatic hydrocarbon organic solvent, and stirring to fully dissolve the flaky or powdery modifying agent in the high aromatic hydrocarbon organic solvent to obtain a mixed modified solution;
s2: putting the matrix asphalt into a container, heating to 180-200 ℃, and then sequentially adding the auxiliary material, the rubber oil, the compatilizer, the stabilizer and the ultraviolet absorbent under a sealed condition, and stirring for 30 minutes to obtain a mixed material;
s3: adding the mixed modification solution obtained in the step S1 into the mixed material obtained in the step S2 under the sealed condition, controlling the temperature between 160 ℃ and 170 ℃, stirring for 30 minutes, keeping the container in a sealed state during the period from the beginning of stirring to 15 minutes, opening the container after stirring for 15 minutes, keeping the container in an open state, and stirring for 30 minutes to obtain a base material, wherein the obtained base material is sticky;
s4: putting the base material obtained in the step S3 into a shearing machine for shearing, and adding polyphosphoric acid into the base material through a shearing machine in the shearing process to obtain a semi-finished product;
s5: and stirring the semi-finished product obtained in the step S4 for 50 minutes at the temperature of 200 ℃ to obtain the SBS modified asphalt.
5. The SBS modified asphalt of claim 4, wherein: the shearing machine comprises a machine body (1) and a shearing rod (2); the shearing rod (2) is rotatably arranged at the lower end of the machine body (1), and the diffusion rings (3) are uniformly and fixedly arranged in the outer wall of the shearing rod (2); the outer surface of the diffusion ring (3) is elastically connected with a sealing ring (4) in a sliding manner, and the diffusion ring (3) is communicated with the spiral groove (5); the inner part of the sealing ring (4) is provided with a liquid leakage hole (6), and the liquid leakage hole (6) in the sealing ring (4) and the liquid leakage hole (6) of the diffusion ring (3) can be mutually overlapped along with the rotation of the sealing ring (4); the spiral groove (5) is formed in the shearing rod (2), the outer end of the spiral groove (5) is smaller in aperture than the inner end, and the inner end of the spiral groove (5) is communicated with the diversion groove (7); the distributing chutes (7) are uniformly arranged in the middle of the shearing rod (2), the distributing chutes (7) are communicated with one another, and polyphosphoric acid is filled in the distributing chutes (7).
6. The SBS modified asphalt of claim 5, wherein: the size of the cavity of the shunting groove (7) is sequentially set from top to bottom from large to small.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010251692.2A CN111234548A (en) | 2020-04-01 | 2020-04-01 | SBS modified asphalt |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010251692.2A CN111234548A (en) | 2020-04-01 | 2020-04-01 | SBS modified asphalt |
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| CN111234548A true CN111234548A (en) | 2020-06-05 |
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| CN202010251692.2A Withdrawn CN111234548A (en) | 2020-04-01 | 2020-04-01 | SBS modified asphalt |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112226095A (en) * | 2020-09-26 | 2021-01-15 | 黄伟 | Preparation method of low-cost anti-segregation aging-resistant modified asphalt |
| CN113717536A (en) * | 2021-09-06 | 2021-11-30 | 镇江越辉新材料有限公司 | High-performance modified asphalt and manufacturing method thereof |
-
2020
- 2020-04-01 CN CN202010251692.2A patent/CN111234548A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112226095A (en) * | 2020-09-26 | 2021-01-15 | 黄伟 | Preparation method of low-cost anti-segregation aging-resistant modified asphalt |
| CN113717536A (en) * | 2021-09-06 | 2021-11-30 | 镇江越辉新材料有限公司 | High-performance modified asphalt and manufacturing method thereof |
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Application publication date: 20200605 |