CN113999650A - Low-temperature type crack pouring adhesive for asphalt pavement and preparation method thereof - Google Patents
Low-temperature type crack pouring adhesive for asphalt pavement and preparation method thereof Download PDFInfo
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- CN113999650A CN113999650A CN202111385730.4A CN202111385730A CN113999650A CN 113999650 A CN113999650 A CN 113999650A CN 202111385730 A CN202111385730 A CN 202111385730A CN 113999650 A CN113999650 A CN 113999650A
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Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J195/00—Adhesives based on bituminous materials, e.g. asphalt, tar, pitch
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/04—Non-macromolecular additives inorganic
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/08—Macromolecular additives
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Road Paving Structures (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention belongs to the technical field of road maintenance materials, and provides a low-temperature crack pouring adhesive for an asphalt pavement and a preparation method thereof. The linear SBS of the invention can keep high elasticity and bear larger deformation without being damaged in the use temperature range, thereby improving the low-temperature toughness of the crack pouring adhesive; moreover, at a lower temperature, the SBS can effectively absorb the strain energy of part of the crack pouring glue, so that the low-temperature performance of the crack pouring glue is improved. Meanwhile, due to the swelling property of the waste rubber powder, the SBS-matrix asphalt graft copolymer is formed by the matrix asphalt and the waste rubber powder, so that a stable space network structure is formed, the existence of the space network structure enables the asphalt pavement crack pouring adhesive to generate elastic deformation (such as wetting and expansion) along with crack expansion and contraction, the sealing effect is always kept, and the problem of insufficient low-temperature toughness of the crack pouring adhesive is obviously solved; further improving the cohesiveness, stability, low-temperature crack resistance and tensile property of the crack pouring glue and improving the segregation phenomenon.
Description
Technical Field
The invention relates to the technical field of road maintenance materials, in particular to a low-temperature crack pouring adhesive for an asphalt pavement and a preparation method thereof.
Background
The road maintenance is important content for keeping road conditions intact, prolonging the service life of roads, giving play to social and economic benefits of the roads and providing good service for economic construction. In the whole highway maintenance work, the pavement maintenance is the central link of the highway maintenance work. Asphalt pavement is the main structural form of Chinese highway and urban road pavement. Along with the increase of the mileage of the highway and the extension of the service time, the workload of highway maintenance is larger and larger, and the quality of the maintenance directly influences the service quality of the road. In order to adapt to uninterrupted, rapid, comfortable and safe traffic, the pavement maintenance quality must be improved, so that the service level of the pavement is effectively ensured.
The crack damage is the main damage mode of the asphalt pavement, and the repair of the crack of the asphalt pavement is the frequent work of maintaining the asphalt pavement. The highway is loaded with heavy traffic flow, usually once cracks appear, the traffic is not allowed to be interrupted for a long time or the traffic section is not compressed to repair, and the road surface disease treatment should be 'quickly put into place, quickly repaired and quickly withdrawn'. The method has positive significance for researching a new method for repairing the crack in a targeted manner.
With the development of maintenance technology, the improvement of road grade and the increase of traffic volume, the requirements on road maintenance are changed, and the requirements on rapid road repair and rapid traffic opening are higher. Therefore, on the basis of adopting a new maintenance technology and maintenance equipment, the crack sealing material for rapid repair has the effect of achieving twice the result with half the effort for the development of pavement crack repair work.
At present, commonly used crack filling materials can be classified into common type crack pouring adhesives, low-temperature type crack pouring adhesives and severe cold type crack pouring adhesives according to use conditions. Wherein the use temperature of the low-temperature type crack pouring adhesive is more than or equal to-20 ℃. The patent with publication number CN 107603559A discloses a common pavement crack pouring adhesive and a preparation method thereof, wherein the common pavement crack pouring adhesive comprises matrix asphalt, SBS, cosolvent, stabilizer, modifier, softener, granite mineral powder, resin and waste rubber powder. The patent with publication number CN 109082263A discloses a low-temperature type crack pouring adhesive, which comprises matrix asphalt, neoprene latex, waste tire rubber powder, furfural extract oil, hydrogenated rosin pentaerythritol ester, asbestos powder, SBS, dibutyl phthalate, 1-chlorododecane and sulfide. However, the joint compound has a problem of poor low-temperature toughness.
Disclosure of Invention
In view of the above, the invention aims to provide a low-temperature crack pouring adhesive for an asphalt pavement and a preparation method thereof. The low-temperature crack pouring adhesive for the asphalt pavement has excellent low-temperature toughness.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a low-temperature crack pouring adhesive for an asphalt pavement, which comprises the following preparation raw materials in parts by weight: 100 parts of matrix asphalt, 3-10 parts of styrene-butadiene-styrene block copolymer, 7-8 parts of petroleum resin, 14-18 parts of talcum powder, 12-15 parts of waste rubber powder, 0-20 parts of phthalate compound and 2-9 parts of compatibilizer; the styrene-butadiene-styrene block copolymer is a linear styrene-butadiene-styrene block copolymer.
Preferably, the indicators of the base asphalt include: the penetration degree is 60-80 at 25 ℃; the softening point is more than or equal to 46 ℃; the dynamic viscosity at 60 ℃ is more than or equal to 180 Pa.s; the ductility is more than or equal to 100cm at 15 ℃; solubility in trichloroethylene is more than 99.5%; the flash point is more than or equal to 260 ℃; the mass content of the wax is less than or equal to 2.2 percent.
Preferably, the linear styrene-butadiene-styrene block copolymer has the model number YH-791-1301.
Preferably, the particle size of the talcum powder is more than or equal to 1250 meshes.
Preferably, the waste rubber powder comprises waste tire rubber powder; the particle size of the waste rubber powder is more than or equal to 80 meshes.
Preferably, the phthalate compound comprises dibutyl phthalate.
Preferably, the compatibilizer comprises a lubricating oil.
The invention also provides a preparation method of the low-temperature crack pouring adhesive for the asphalt pavement, which comprises the following steps:
heating and melting the matrix asphalt to obtain molten asphalt;
primarily mixing the molten asphalt, the styrene-butadiene-styrene block copolymer and the compatibilizer to obtain a primary mixed material;
and sequentially mixing the primary mixed material with waste rubber powder, talcum powder and petroleum resin, and then sequentially shearing, dispersing and swelling to develop to obtain the low-temperature crack pouring adhesive for the asphalt pavement.
Preferably, the rotating speed of the shearing is 3000r/min, the temperature is 165-185 ℃, and the time is 1-2 h.
Preferably, the rotating speed of the dispersion is 5000r/min, the temperature is 165-185 ℃, and the time is 0.5-1 h.
The invention provides a low-temperature crack pouring adhesive for an asphalt pavement, which comprises the following preparation raw materials in parts by weight: 100 parts of matrix asphalt, 3-10 parts of styrene-butadiene-styrene block copolymer, 7-8 parts of petroleum resin, 14-18 parts of talcum powder, 12-15 parts of waste rubber powder, 0-20 parts of phthalate compound and 2-9 parts of compatibilizer; the styrene-butadiene-styrene block copolymer is a linear styrene-butadiene-styrene block copolymer. The linear SBS of the invention can keep high elasticity and bear larger deformation without being damaged within the use temperature range (more than or equal to-20 ℃), thereby improving the low-temperature toughness of the crack pouring glue; moreover, at a lower temperature, the SBS can effectively absorb the strain energy of part of the crack pouring glue, so that the low-temperature performance of the crack pouring glue is improved. Meanwhile, due to the swelling property of the waste rubber powder, light components in the matrix asphalt can enter the rubber network of the waste rubber powder, so that the content of free wax in the matrix asphalt is obviously reduced, and the asphalt is changed from a sol type to a sol-gel type; the free wax has great influence on the temperature sensitivity of the matrix asphalt, so that the content of the free wax in the matrix asphalt is reduced, which means that the temperature sensitivity of the matrix asphalt is reduced, and further the low-temperature performance of the crack pouring adhesive is improved. In addition, due to the swelling property of the waste rubber powder, the SBS-matrix asphalt graft copolymer is formed by the matrix asphalt and the waste rubber powder, so that a stable space network structure is formed, the existence of the space network structure enables the asphalt pavement crack pouring adhesive to generate elastic deformation (such as wetting and expansion) along with crack expansion and contraction, the sealing effect is always kept, and the problem of insufficient low-temperature toughness of the crack pouring adhesive is obviously solved; further improving the cohesiveness, stability, low-temperature crack resistance and tensile property of the crack pouring glue and improving the segregation phenomenon. In addition, the waste rubber powder is a renewable resource, so that the cost is reduced, and the resource is recycled.
The invention also provides a preparation method of the low-temperature crack pouring adhesive for the asphalt pavement, which comprises the following steps: heating and melting the matrix asphalt to obtain molten asphalt; primarily mixing the molten asphalt, the styrene-butadiene-styrene block copolymer and the compatibilizer to obtain a primary mixed material; and sequentially mixing the primary mixed material with waste rubber powder, talcum powder and petroleum resin, and then sequentially shearing, dispersing and swelling to develop to obtain the low-temperature crack pouring adhesive for the asphalt pavement. The preparation method provided by the invention can fully mix all materials, particularly the powder (talcum powder and waste rubber powder) can be fully dispersed in the asphalt matrix, and the performance of the low-temperature type crack pouring adhesive for the asphalt pavement is improved by improving the dispersibility of the low-temperature type crack pouring adhesive for the asphalt pavement.
Drawings
FIG. 1 is a flow chart of the preparation of the low-temperature joint sealing adhesive for asphalt pavement according to the present invention;
FIG. 2 is a DSR sample drawing of the low-temperature type crack pouring adhesive for asphalt pavement obtained in examples 1-4, wherein A-D sequentially represent the DSR sample drawing of the low-temperature type crack pouring adhesive for asphalt pavement obtained in examples 1-4;
FIG. 3 is a fluorescent image of the joint compound obtained in example 2.
Detailed Description
The invention provides a low-temperature crack pouring adhesive for an asphalt pavement, which comprises the following preparation raw materials in parts by weight: 100 parts of matrix asphalt, 3-10 parts of styrene-butadiene-styrene block copolymer, 7-8 parts of petroleum resin, 14-18 parts of talcum powder, 12-15 parts of waste rubber powder, 0-20 parts of phthalate compound and 2-9 parts of compatibilizer.
The preparation raw materials of the low-temperature type crack pouring adhesive for the asphalt pavement comprise 100 parts by weight of matrix asphalt. In the present invention, the indexes of the base asphalt preferably include: the penetration degree is 60-80 at 25 ℃; the softening point is more than or equal to 46 ℃; the dynamic viscosity at 60 ℃ is more than or equal to 180 Pa.s; the ductility is more than or equal to 100cm at 15 ℃; solubility in trichloroethylene is more than 99.5%; the flash point is more than or equal to 260 ℃; the mass content of the wax is less than or equal to 2.2 percent. In the present invention, the type of the base asphalt is preferably 70# asphalt, and more preferably east China sea brand 70# asphalt. In the invention, the matrix asphalt is used as a matrix of the low-temperature crack pouring adhesive for the asphalt pavement.
Based on the weight portion of the matrix asphalt, the raw materials for preparing the low-temperature crack pouring adhesive for the asphalt pavement comprise 3-10 parts by weight of styrene-butadiene-styrene block copolymer (SBS), preferably 4-9 parts by weight, and further preferably 5-8 parts by weight; specifically, 4 parts, 6 parts or 9 parts is preferable. In the present invention, the styrene-butadiene-styrene block copolymer (SBS) is a linear styrene-butadiene-styrene block copolymer (SBS); the linear styrene-butadiene-styrene block copolymer (SBS) is preferably of the type YH-791-1301 of the ba ling petrochemical company. In the invention, the linear SBS can keep high elasticity and bear larger deformation without being damaged within the use temperature range (more than or equal to-20 ℃), thereby improving the low-temperature toughness of the crack pouring glue; meanwhile, at a lower temperature, SBS can effectively absorb strain energy of part of crack pouring glue, so that the low-temperature performance of the crack pouring glue is improved; in addition, the molecular chain of SBS and the matrix asphalt can generate SBS-matrix asphalt graft copolymer, so as to form stable space network structure, further improve the cohesiveness, stability, low temperature crack resistance and tensile property of the crack pouring glue, and improve segregation phenomenon.
Based on the weight portion of the matrix asphalt, the preparation raw material of the low-temperature type crack pouring adhesive for the asphalt pavement comprises 7-8 parts by weight of petroleum resin, and particularly preferably 7 or 8 parts by weight of petroleum resin. In the invention, the petroleum resin is a petroleum derivative, is in a thermoplastic viscous liquid state, has good miscibility and chemical stability to acid and alkali, and has the characteristics of regulating the cementation of fissures adhesiveness and thermal stability. The petroleum resin improves the compatibility of the matrix asphalt; the consistency of the joint filling glue can be increased, and the purpose of adjusting the needle penetration of the joint filling glue is achieved.
Based on the weight portion of the matrix asphalt, the raw materials for preparing the low-temperature type crack pouring adhesive for the asphalt pavement comprise 14-18 parts by weight of talcum powder, preferably 14.5-17.5, further preferably 14-17%, more preferably 14.5-16.5%, and particularly preferably 18 parts or 14 parts. In the present invention, the particle size of the talc powder is preferably not less than 1250 mesh, and more preferably 1250 mesh. In the invention, the main component of the talcum powder is hydrous magnesium silicate which has the advantages of good lubricity, high stability and strong adsorbability. The talc powder can generate active free radicals under high-speed shearing, so that an SBS polymer molecular chain and matrix asphalt form an SBS-matrix asphalt graft copolymer, a stable space structure is formed, the stability of the crack pouring adhesive can be improved, and the low-temperature crack resistance and the segregation phenomenon of the crack pouring adhesive are improved. Furthermore, the talcum powder with the grain size of 1250 meshes is selected, so that the cost of the crack pouring adhesive is reduced.
Based on the weight portion of the matrix asphalt, the preparation raw materials of the low-temperature type crack pouring adhesive for the asphalt pavement comprise 12-15 parts by weight of waste rubber powder, and preferably 13-14 parts by weight of waste rubber powder. In the present invention, the waste rubber powder preferably includes waste tire rubber powder. In the invention, the particle size of the waste rubber powder is preferably not less than 80 meshes, and more preferably 80 meshes. In the invention, the waste rubber is preferably waste tire rubber powder purchased from the Ministry of Dujiang Yangtze river rubber products. In the invention, the waste rubber powder is processed from waste automobile tires and mainly comprises rubber (such as isoprene rubber, styrene butadiene rubber, chloroprene rubber, isopropyl rubber and the like), carbon black, zinc oxysulfide and a sulfur aid. The preparation method mainly comprises the following steps: and removing steel wires in the recycled waste automobile tires, and processing the steel wires into powder with different grain diameters. In the invention, the thermal stability of the asphalt can be increased by the lysate generated by the degradation of rubber in the waste tire rubber powder; moreover, the molecular weight distribution range of the lysate is wider, so that the low-temperature toughness of the matrix asphalt is enhanced, and the low-temperature cracking of the matrix asphalt can be reduced to a certain extent. Meanwhile, due to the swelling property of the waste tire rubber powder, light components in the matrix asphalt can enter the rubber network of the waste tire rubber powder, so that the content of free wax in the matrix asphalt is obviously reduced, and the asphalt is changed from a sol type to a sol type; the free wax has great influence on the temperature sensitivity of the matrix asphalt, so that the content of the free wax in the matrix asphalt is reduced, which means that the temperature sensitivity of the matrix asphalt is reduced, and further the low-temperature performance of the crack pouring adhesive is improved. In addition, due to the swelling property of the waste tire rubber powder, the SBS-matrix asphalt graft copolymer is formed by the matrix asphalt and the waste tire rubber powder, so that a stable space network structure is formed, the existence of the space network structure enables the asphalt pavement crack pouring adhesive to generate elastic deformation (such as wetting and expansion) along with crack expansion and contraction, the sealing effect is always kept, and the problem of insufficient low-temperature toughness of the crack pouring adhesive is obviously solved; further improving the cohesiveness, stability, low-temperature crack resistance and tensile property of the crack pouring glue and improving the segregation phenomenon. In addition, the waste rubber powder is a renewable resource, so that the cost is reduced, and the resource is recycled.
Based on the weight portion of the matrix asphalt, the preparation raw material of the low-temperature type crack pouring adhesive for the asphalt pavement comprises 0-20 parts by weight of phthalate compound, preferably 0.001-20 parts by weight, more preferably 2-19 parts by weight, and particularly preferably 0 part by weight, 2 parts by weight, 16 parts by weight or 19 parts by weight. In the present invention, the phthalate-based compound preferably includes dibutyl phthalate. In the invention, the dibutyl phthalate has good stability and cohesiveness compared with other types of plasticizers; when the phthalate compound is used for asphalt pavement, the phthalate compound plays a role of a surfactant, and can obviously reduce the surface tension and viscosity of matrix asphalt; meanwhile, the dibutyl phthalate can play a role in lubrication, and the compatibility of the matrix asphalt and other polymers (such as SBS and waste rubber powder) is improved.
Based on the weight portion of the matrix asphalt, the raw materials for preparing the low-temperature crack pouring adhesive for the asphalt pavement comprise 2-9% of a compatibilizer, preferably 3-8 parts, and further preferably 4-7 parts. In the present invention, the compatibilizer preferably includes a lubricating oil. In the invention, the lubricating oil is used as a compatibilizer, so that the matrix asphalt has certain fluidity at normal temperature and low temperature; meanwhile, the compatibility of SBS-waste rubber powder-matrix asphalt can be adjusted, so that SBS and waste rubber powder can be uniformly distributed in the matrix asphalt.
The invention also provides a preparation method of the low-temperature crack pouring adhesive for the asphalt pavement, which comprises the following steps:
heating and melting the matrix asphalt to obtain molten asphalt;
primarily mixing the molten asphalt, the styrene-butadiene-styrene block copolymer and the compatibilizer to obtain a primary mixed material;
and sequentially mixing the primary mixed material with waste rubber powder, talcum powder and petroleum resin, and then sequentially shearing, dispersing and swelling to develop to obtain the low-temperature crack pouring adhesive for the asphalt pavement.
The invention heats and melts the matrix asphalt to obtain the molten asphalt.
In the invention, the heating and melting temperature is preferably 120-150 ℃; the time is preferably 0.5 to 1.0 hour, and more preferably 0.5 hour. In the present invention, the heating and melting are preferably performed in an oven.
After obtaining the molten asphalt, the invention carries out primary mixing on the molten asphalt, the styrene-butadiene-styrene block copolymer and the compatibilizer to obtain a primary mixed material.
In the present invention, the styrene-butadiene-styrene block copolymer and the compatibilizer are preferably added to the molten asphalt at the same time. In the invention, the initial mixing temperature is preferably 170-190 ℃, and further preferably 180 ℃; the time is preferably 5 min; the initial mixing is preferably carried out under stirring. In the present invention, the preliminary mixing is preferably carried out in a heating jacket.
After the primary mixed material is obtained, the primary mixed material is sequentially mixed with waste rubber powder, talcum powder and petroleum resin, and then shearing, dispersing and swelling development are sequentially carried out, so that the low-temperature type crack pouring adhesive for the asphalt pavement is obtained.
In the invention, after the waste rubber powder is added, the talcum powder is added, and the petroleum resin is added, the waste rubber powder, the talcum powder and the petroleum resin are preferably stirred for 5-10 min at 170-190 ℃, and further preferably stirred for 5min at 180 ℃. In the invention, the primary mixing is sequentially mixed with the waste rubber powder, the talcum powder and the petroleum resin, preferably in a heating jacket.
In the present invention, the rotation speed of the shearing is preferably 3000 r/min; the temperature is preferably 165-185 ℃; the time is preferably 1 to 2 hours, and more preferably 1.5 hours. In the present invention, the shearing is preferably carried out on a shear apparatus.
In the invention, the rotation speed of the dispersion is preferably 5000r/min, the temperature is preferably 165-185 ℃, and the time is preferably 0.5-1 h, and particularly preferably 0.5 h. In the present invention, the dispersion is preferably carried out on a disperser.
In the invention, the temperature for swelling development is preferably 150-170 ℃, and more preferably 160 ℃; the time is preferably 0.5 to 1.0 hour, and more preferably 0.5 hour. In the present invention, the swelling development is preferably carried out in an oven.
The preparation method provided by the invention can fully mix all materials, particularly fully disperse powder (talcum powder and waste rubber powder) in organic matters, and improve the final low-temperature crack pouring adhesive for the asphalt pavement.
FIG. 1 is a flow chart of the preparation of the low-temperature joint grouting glue for asphalt pavement provided by the invention.
The low-temperature type joint compound for asphalt pavement and the preparation method thereof provided by the present invention are described in detail with reference to the following examples, but they should not be construed as limiting the scope of the present invention.
The following examples used starting materials including: the indexes of the east China sea brand No. 70 matrix asphalt are shown in Table 1, the indexes of YH-791-1301 linear styrene-butadiene-styrene block copolymer are shown in Table 2, the indexes of lubricating oil are shown in Table 3, the indexes of dibutyl phthalate are shown in Table 4, the indexes of waste tire rubber powder purchased from the Ming division of Dujiangwei winghe rubber products are shown in Table 5, the indexes of talc powder are shown in Table 6, and the indexes of petroleum resin are shown in Table 7.
TABLE 1 indexes of No. 70 Tohai base asphalt
TABLE 2 indices for YH-791-1301 Linear SBS
| Serial number | Detecting items | The result of the detection |
| 1 | Volatile matter (wt%) | 0.4 |
| 2 | 300% constant tensile force (MPa) | 2.9 |
| 3 | Tensile Strength (MPa) | 24 |
| 4 | Elongation at Break (%) | 810 |
| 5 | Permanent set at break (%) | 20 |
| 6 | Melt flow Rate (g/min) | 1 |
TABLE 3 index of lubricating oils
TABLE 4 dibutyl phthalate index
| Serial number | Detecting items | The result of the detection |
| 1 | Appearance of the product | Colorless or pale yellow liquid |
| 2 | Content (wt%) | ≥99.5 |
| 3 | Relative density | 1.0463～1.0475 |
| 4 | Volatile substance (wt%) | ≤0.3 |
| 5 | Free acid (phthalate) (wt%) | ≤0.05 |
TABLE 5 indexes of waste tire rubber powder
| Serial number | Detecting items | The result of the detection |
| 1 | Appearance of the product | Black powder |
| 2 | Diameter (mesh) | 80 |
| 3 | Metal content (wt%) | 0.029 |
| 4 | Water content (wt%) | 0.53 |
| 5 | Hydrocarbon content (wt%) of rubber | 60 |
| 6 | Ash content (wt%) | 4 |
| 7 | Carbon Black content (wt%) | 34 |
TABLE 6 indices of Talc powder
TABLE 7 indices of Petroleum resins
| Serial number | Detecting items | The result of the detection |
| 1 | Appearance of the product | Light yellow liquid |
| 2 | Softening Point (. degree. C.) | 100～130 |
| 3 | Acid value (KOH/g) | ≤1 |
| 4 | Ash content (wt%) | ≤1 |
| 5 | Bromine number (gBr/100g) | 0.25 |
| 6 | Viscosity (25 ℃, mPa. multidot.s) | 550～1100 |
| 7 | Specific gravity of | 1.6 |
Example 1
The low-temperature crack pouring adhesive for the asphalt pavement comprises the following preparation raw materials in parts by weight: 100 parts of matrix asphalt, 6 parts of SBS, 2 parts of lubricating oil, 2 parts of dibutyl phthalate, 12 parts of waste tire rubber powder, 14 parts of talcum powder and 7 parts of petroleum resin.
The preparation method of the low-temperature crack pouring adhesive for the asphalt pavement comprises the following steps:
and step S1, weighing the materials according to the mixture ratio. And (3) placing the matrix asphalt sample in an oven, and heating and melting for 0.5h at 150 ℃ to obtain molten asphalt.
And step S2, transferring the molten asphalt to a heat-insulating sleeve, controlling the temperature at 180 ℃, simultaneously adding SBS and lubricating oil, and stirring for 5min to obtain a primary mixed material.
Step S3, sequentially adding waste rubber powder, talcum powder and petroleum resin into the primary mixed material, stirring for 5min each time when materials are added, and controlling the temperature at 180 ℃;
step S4, placing the mixture obtained in the step S3 on a shearing instrument for shearing for 1.5h, wherein the shearing rate is controlled at 3000r/min, and the shearing temperature is controlled at 165-185 ℃;
step S5, placing the sheared sample in a dispersion instrument for dispersion for 30min, controlling the dispersion rate at 5000r/min and the dispersion temperature at 165-185 ℃, and strictly controlling the temperature by using an electrothermal sleeve and a thermometer in the whole preparation process;
and step S6, swelling and developing the sample obtained in the step S5 in an oven at 160 ℃ for 0.5h to obtain the low-temperature type crack pouring adhesive for the asphalt pavement.
Example 2
The low-temperature crack pouring adhesive for the asphalt pavement comprises the following preparation raw materials in parts by weight: 100 parts of matrix asphalt, 4 parts of SBS, 4 parts of lubricating oil, 0 part of dibutyl phthalate, 12 parts of waste tire rubber powder, 14 parts of talcum powder and 7 parts of petroleum resin.
The preparation method is the same as example 1.
Example 3
The low-temperature crack pouring adhesive for the asphalt pavement comprises the following preparation raw materials in parts by weight: 100 parts of matrix asphalt, 6 parts of SBS, 6 parts of lubricating oil, 16 parts of dibutyl phthalate, 13 parts of waste tire rubber powder, 18 parts of talcum powder and 8 parts of petroleum resin.
The preparation method is the same as example 1.
Example 4
The low-temperature crack pouring adhesive for the asphalt pavement comprises the following preparation raw materials in parts by weight: 100 parts of matrix asphalt, 9 parts of SBS, 9 parts of lubricating oil, 19 parts of dibutyl phthalate, 15 parts of waste tire rubber powder, 18 parts of talcum powder and 8 parts of petroleum resin.
The preparation method is the same as example 1.
FIG. 2 is a DSR sample drawing of the low-temperature type crack pouring sealant for asphalt pavement obtained in examples 1 to 4, wherein A to D represent the DSR sample drawing of the low-temperature type crack pouring sealant for asphalt pavement obtained in examples 1 to 4 in sequence.
Comparative example 1
The joint grouting glue for the common asphalt pavement comprises the following raw materials in parts by mass:
100 parts of matrix asphalt, 0.5 part of SBS, 3 parts of cosolvent (petroleum aromatic oil), 0.15 part of stabilizer (maleic anhydride), 0.15 part of modifier (borate coupling agent), 3 parts of softener (minus-second-line extract oil), 40 parts of granite mineral powder (200 meshes), 5 parts of resin and 40 parts of waste rubber powder (100 meshes).
The raw materials of comparative example 1 above were prepared as follows:
heating 100 parts of matrix asphalt to a flowing state at 135 ℃, adding 0.5 part of SBS and 3 parts of cosolvent when the temperature is raised to 175 ℃ under the stirring state, stirring for 20min, shearing for 50min, stirring again, and sequentially adding 0.15 part of stabilizer, 0.15 part of modifier, 3 parts of softener, 40 parts of granite mineral powder, 5 parts of resin and 40 parts of waste rubber powder when the temperature is raised to 75min to obtain the common pavement crack pouring sealant.
Comparative example 2
The low-temperature type crack pouring adhesive comprises the following raw materials in parts by mass:
50 parts of matrix asphalt, 15 parts of neoprene latex, 15 parts of waste tire rubber powder, 10 parts of furfural extract oil, 8 parts of hydrogenated rosin pentaerythritol ester, 8 parts of asbestos powder, 5 parts of SBS, 3 parts of dibutyl phthalate, 0.2 part of 1-chlorododecane and 0.2 part of sulfide.
The raw materials of comparative example 2 above were prepared as follows:
heating the matrix asphalt to 155 ℃, sequentially adding neoprene latex, furfural extract oil, hydrogenated rosin pentaerythritol ester, asbestos powder, SBS, dibutyl phthalate and 1-chlorododecane under stirring, and continuously stirring for 20min to obtain a uniformly mixed mixture; heating to 185 deg.C, colloid-grinding the mixture for 30min, adding sulfide, and stirring for 20 min; and then continuously heating to 195 ℃, adding waste tire rubber powder, stirring and developing for 120min to obtain the low-temperature type crack pouring adhesive.
The performance of the crack pouring glue obtained in examples 1-4 and comparative examples 1-2 was tested. The cone penetration, softening point, flow value, elastic recovery, ductility, low temperature stiffness modulus, and low temperature creep rate were measured separately and compared. The test results are shown in table 8.
TABLE 8 Performance test results of the joint sealants obtained in examples 1 to 4 and comparative examples 1 to 2
As can be seen from table 8, the low-temperature type joint grouting glue for asphalt pavement provided by the invention has lower penetration, lower temperature sensitivity and more stable performance compared with the common joint grouting glue for asphalt pavement, and is suitable for various environments; the softening point is higher, which shows that the low-temperature crack pouring adhesive for the asphalt pavement has better heat resistance, smaller temperature sensitivity and higher temperature stability; the flow values are all less than 5, which shows that the low-temperature crack pouring adhesive for the asphalt pavement still has good stability at high temperature, and the flow value of the crack pouring adhesive in the comparative example 1 is more than 5, so that the crack pouring adhesive is not beneficial to being used at high temperature; the elastic recovery rate is generally higher, which shows that the low-temperature crack pouring adhesive for the asphalt pavement is more stable in form and more durable in crack repair; the good elastic recovery performance can reduce the residual deformation of the pavement material under the action of load, and reflects that the low-temperature crack pouring adhesive for the asphalt pavement has better fatigue resistance and reflection crack resistance; the ductility of the low-temperature type crack pouring adhesive for the asphalt pavement obtained in the embodiments 1-4 is greater than that of the comparative example 1, which shows that the low-temperature type crack pouring adhesive for the asphalt pavement provided by the invention has better plasticity and can better resist the external force action without being damaged; the results of the SHRP research suggest that when the low-temperature creep rate m is more than or equal to 0.3 and the low-temperature stiffness modulus s is less than or equal to 300 m.Pa, the matrix asphalt meets the low-temperature crack resistance requirement, and the table 8 shows that the low-temperature crack pouring sealant for the asphalt pavement prepared by the invention meets the low-temperature crack resistance requirement.
Compared with the low-temperature crack pouring adhesive for the asphalt pavement, which is provided by the comparative example 2, the low-temperature crack pouring adhesive provided by the invention has lower penetration degree and higher softening point, namely, the temperature sensitivity is lower, the temperature stability is better, the crack pouring adhesive is more heat-resistant, the performance is more stable, and the crack pouring adhesive is more suitable for complicated field environmental conditions; the flow values of examples 1-4 and comparative example 2 are less than 5, and the crack pouring adhesive obtained by the invention is lower, which shows that the crack pouring adhesive provided by the invention has better high-temperature stability while meeting the requirements of low-temperature crack pouring adhesives; compared with the comparative example 2, the elasticity recovery rate of the crack pouring sealant provided by the invention is higher, which shows that the crack pouring sealant provided by the invention has better fatigue resistance and reflection crack resistance, and has higher ductility and better plasticity; by integrating the low-temperature stiffness modulus and the low-temperature creep rate data, the comparative example 2 and the examples 1-3 meet the requirement of low-temperature crack resistance, and the low-temperature crack pouring sealant prepared by the invention has better low-temperature performance and better low-temperature crack resistance, and can be suitable for complex road environments at low temperature and even under severe cold conditions.
The fluorescence test of the joint sealant obtained in example 2 is shown in FIG. 3, and it can be seen from FIG. 3 that: adding linear SBS to form network space structure with waste tyre rubber powder; the network space structure is uniformly dispersed in the matrix asphalt (black part in the figure), so that the cohesiveness, the toughness and the tensile property of the crack pouring adhesive are improved; although some agglomeration phenomena can be seen in the figure, the agglomeration phenomena are low in content and do not influence the overall performance of the crack pouring glue.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The low-temperature crack pouring adhesive for the asphalt pavement is characterized by comprising the following preparation raw materials in parts by weight: 100 parts of matrix asphalt, 3-10 parts of styrene-butadiene-styrene block copolymer, 7-8 parts of petroleum resin, 14-18 parts of talcum powder, 12-15 parts of waste rubber powder, 0-20 parts of phthalate compound and 2-9 parts of compatibilizer; the styrene-butadiene-styrene block copolymer is a linear styrene-butadiene-styrene block copolymer.
2. The low-temperature type crack pouring adhesive for the asphalt pavement according to claim 1, wherein the indexes of the matrix asphalt comprise: the penetration degree is 60-80 at 25 ℃; the softening point is more than or equal to 46 ℃; the dynamic viscosity at 60 ℃ is more than or equal to 180 Pa.s; the ductility is more than or equal to 100cm at 15 ℃; solubility in trichloroethylene is more than 99.5%; the flash point is more than or equal to 260 ℃; the mass content of the wax is less than or equal to 2.2 percent.
3. The low-temperature type crack pouring adhesive for the asphalt pavement as claimed in claim 1, wherein the linear styrene-butadiene-styrene block copolymer has the model number YH-791-1301.
4. The low-temperature crack pouring adhesive for the asphalt pavement according to claim 1, wherein the particle size of the talcum powder is more than or equal to 1250 meshes.
5. The low-temperature type crack pouring sealant for asphalt pavement according to claim 1, wherein the waste rubber powder comprises waste tire rubber powder; the particle size of the waste rubber powder is more than or equal to 80 meshes.
6. The low-temperature crack pouring sealant for asphalt pavement according to claim 1, wherein the phthalate ester compound comprises dibutyl phthalate.
7. The low-temperature type crack pouring adhesive for the asphalt pavement according to claim 1, wherein the compatibilizer comprises lubricating oil.
8. The preparation method of the low-temperature type crack pouring adhesive for the asphalt pavement according to any one of claims 1 to 7, comprising the following steps:
heating and melting the matrix asphalt to obtain molten asphalt;
primarily mixing the molten asphalt, the styrene-butadiene-styrene block copolymer and the compatibilizer to obtain a primary mixed material;
and sequentially mixing the primary mixed material with waste rubber powder, talcum powder and petroleum resin, and then sequentially shearing, dispersing and swelling to develop to obtain the low-temperature crack pouring adhesive for the asphalt pavement.
9. The preparation method according to claim 8, wherein the rotation speed of the shearing is 3000r/min, the temperature is 165-185 ℃, and the time is 1-2 h.
10. The preparation method according to claim 8, wherein the rotation speed of the dispersion is 5000r/min, the temperature is 165-185 ℃, and the time is 0.5-1 h.
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| CN115505371A (en) * | 2022-10-27 | 2022-12-23 | 江苏博程交通科技有限公司 | Formula, preparation process and processing device for normal-temperature asphalt pavement crack pouring adhesive |
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