CN114015244A - High-performance rubber asphalt and preparation method thereof - Google Patents
High-performance rubber asphalt and preparation method thereof Download PDFInfo
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- CN114015244A CN114015244A CN202111161092.8A CN202111161092A CN114015244A CN 114015244 A CN114015244 A CN 114015244A CN 202111161092 A CN202111161092 A CN 202111161092A CN 114015244 A CN114015244 A CN 114015244A
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention discloses high-performance rubber asphalt and a preparation method thereof, wherein the high-performance rubber asphalt comprises the following components in parts by weight: 80 parts of asphalt, 18 parts of tire rubber powder, 1 part of gutta-percha, 0.5 part of butadiene, 0.4 part of sulfur, 0.05 part of initiator and 0.05 part of antioxidant. In the preparation process, a high-temperature mixing process is adopted, the tire rubber powder is placed in an internal mixer for separate internal mixing, and then a small amount of auxiliary agent is added into the internal mixer. The tire rubber powder is subjected to physical and chemical reaction through the high-temperature action and the mechanical shearing action of the internal mixer to form cured rubber powder, and then the cured rubber powder is mixed with asphalt to develop, so that the high-performance rubber asphalt material is obtained. The invention improves the formula of the rubber modifier and combines a high-temperature banburying process, greatly improves the road and durability of the modified asphalt, solves the problem of construction difficulty caused by overhigh viscosity of the rubber asphalt, has simple preparation process, is economic and environment-friendly, and is suitable for various road engineering environment working conditions.
Description
Technical Field
The invention relates to the technical field of chemical materials, in particular to high-performance rubber asphalt and a preparation method thereof.
Background
The rubber asphalt is a novel high-quality composite material, and is a modified asphalt cementing material obtained by carrying out a melt-expansion reaction on tire rubber powder with the content of more than 15% and asphalt under the conditions of high temperature and full mixing. Because the recycled tires are adopted as the main modified material, compared with the common modified asphalt, the modified asphalt has the advantages of cost, solving the environmental problems caused by waste tires, and having important social and economic values and strategic significance, so that the rubber asphalt is more and more widely applied to road engineering at present. Compared with other modified asphalt materials, the rubber asphalt has obvious advantages on road performance, and is specifically represented as follows: the road noise pollution can be obviously reduced, the influence of noise on residents is reduced, and the improvement of the life quality of the residents is facilitated; the rubber asphalt pavement has high elasticity and recoverability at high temperature, can improve the resistance of the pavement to fatigue cracks and reflection cracks, improve the permanent deformation capability of the pavement against rutting, and prolong the service life of the pavement; the rubber asphalt pavement still has certain elasticity even at low temperature, the sliding resistance between the tire and the pavement is increased, and the wheels can damage the ice layer on the pavement when a vehicle runs, so that the effect of inhibiting the pavement from icing is achieved, the running safety coefficient is improved, and the service quality of the pavement is improved.
However, in the prior art, because the rubber powder particles in the rubber asphalt are difficult to completely dissolve, the rubber powder is suspended in the matrix asphalt in a granular form, and certain segregation occurs in the transportation and use processes after the stirring is completed, so that the performance difference between the upper part and the lower part of the rubber asphalt is large, and the rubber asphalt is difficult to keep stable. Chinese patent CN105348828A describes a process for preparing rubber asphalt, wherein the mixing proportion is 82-92% of waste tire rubber powder, 2-4% of activating agent, 2-5% of binder, 2-4% of activating agent, 1-3% of vulcanizing agent and 1-2% of antioxidant.
In addition, the rubber modified asphalt in the prior art is generally obtained by directly stirring or shearing tire rubber powder with asphalt at a high speed and then carrying out heat preservation development, so that the dispersing performance of the rubber asphalt among materials in the production process is poor, the viscosity of the modified asphalt is greatly increased, the construction workability is poor, and the road use, the service performance and the construction quality of the rubber asphalt are seriously influenced. Therefore, the technical personnel in the field need to solve the problem of providing a high-performance rubber asphalt with good storage stability, low viscosity, excellent road use and service performance.
Disclosure of Invention
The invention provides a high-performance rubber asphalt and a preparation method thereof, wherein a high-temperature mixing process is adopted, tire rubber powder is placed in an internal mixer for separate internal mixing, a small amount of auxiliary agent is added into the internal mixer, the tire rubber powder is subjected to physical and chemical reaction through the high-temperature action and the mechanical shearing action of the internal mixer to form cured rubber powder, and then the cured rubber powder and asphalt are mixed and developed to obtain the high-performance rubber asphalt material.
In order to achieve the purpose, the invention adopts the following technical scheme:
a high-performance rubber asphalt comprises the following components in parts by weight: 80 parts of asphalt, 18-20 parts of tire rubber powder, 1-1.5 parts of eucommia ulmoides gum, 0.5-1.0 part of butadiene, 0.4-0.8 part of sulfur, 0.05-0.1 part of initiator and 0.05-0.1 part of antioxidant.
Preferably, the asphalt is 70-grade A road petroleum asphalt with the penetration degree of 6-8mm and the softening point of more than 45 ℃.
Preferably, the tire rubber powder has a particle size of 30-40 meshes, when the mesh number is too low, the coarse particles affect the low-temperature performance, and when the mesh number is too high, the fine particles cause higher viscosity, which is not favorable for production.
Preferably, the initiator is dibenzoyl peroxide.
Preferably, the antioxidant is tris (2, 4-di-tert-butylphenyl) phosphite.
The invention also provides a preparation method of the high-performance rubber asphalt, which comprises the following steps:
(1) weighing asphalt, tire rubber powder, gutta percha, butadiene, sulfur, an initiator and an antioxidant according to parts by weight for later use;
(2) placing the tire rubber powder, the eucommia ulmoides gum and the initiator weighed in the step (1) into an internal mixer for banburying;
(3) adding sulfur, butadiene and an antioxidant into the material obtained in the step (2), uniformly mixing, and continuously mixing for 15-20min to obtain cured rubber powder;
(4) and (4) mixing the cured rubber powder obtained in the step (3) with asphalt, uniformly mixing the mixture in a high-speed shearing colloid mill, and then preserving heat to obtain the high-performance rubber asphalt.
Preferably, the banburying rotation speed in the step (2) is 50r/min, the temperature is 130-150 ℃, and the time is 10-15 min.
Preferably, the mixing temperature in the step (3) is 130-150 ℃, and the mixing time is 15-20 min.
Preferably, the rotation speed of the high-speed shearing colloid mill in the step (4) is 150r/min, the shearing temperature is 170-; the temperature is 130 ℃ and 150 ℃, and the time is 1-2 h.
According to the technical scheme, compared with the prior art, the invention discloses the high-performance rubber asphalt and the preparation method thereof, and the high-performance rubber asphalt has the following beneficial effects:
1) substances such as gutta-percha, butadiene, sulfur and the like added into the rubber powder can crosslink sulfur in the asphalt and sulfur on the surface of the rubber powder to form a large annular and unbranched network structure consisting of chain molecules, so that the suspension stability of rubber powder particles is improved; meanwhile, the reticular structures can be separated from the entangled rubber powder, so that the molecular weight of the polymer is reduced, and the high-temperature viscosity of the rubber asphalt is also reduced due to the low melting point of the eucommia ulmoides gum;
2) the eucommia ulmoides gum has unique rubber-plastic duality, and the sulfur in the rubber powder is equivalent to an additional vulcanizing agent, so that the eucommia ulmoides gum and the rubber powder are combined under the action of strong shearing force and high temperature by utilizing a high-temperature mixing process, the advantages of the eucommia ulmoides gum and the rubber powder are complementary, the vulcanization reaction between the eucommia ulmoides gum and the rubber powder can be accelerated under the action of strong mechanical shearing force and thermal effect, the desulfurization and degradation effects can be generated on the rubber powder, and the dispersion of the rubber powder in asphalt and the compatibility of the rubber powder with the asphalt are facilitated;
3) the high-temperature shearing action of the high-speed shearing machine is utilized, the desulfurization and degradation of rubber powder can be realized, the cross-linked network structure is further destroyed, the rubber powder can be rapidly dispersed and dissolved into an organic whole when being added into asphalt, the storage stability of the rubber asphalt is greatly improved, the viscosity of the modified asphalt is further reduced, and the construction quality and the construction effect are ensured.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A high-performance rubber asphalt comprises the following components in parts by weight: 80 parts of No. 70A-grade asphalt with the penetration degree of 6mm and the softening point of more than 45 ℃, 18 parts of 30-mesh tire rubber powder, 1 part of gutta-percha, 0.5 part of butadiene, 0.4 part of sulfur, 0.05 part of dibenzoyl peroxide and 0.05 part of tris (2, 4-di-tert-butylphenyl) phosphite.
The preparation method of the high-performance rubber asphalt comprises the following steps:
(1) weighing No. 70A-grade asphalt, 30-mesh tire rubber powder, gutta-percha, butadiene, sulfur, dibenzoyl peroxide and tris (2, 4-di-tert-butylphenyl) phosphite ester for later use;
(2) placing the 30-mesh tire rubber powder, the eucommia ulmoides gum and the dibenzoyl peroxide weighed in the step (1) into an internal mixer for internal mixing, wherein the internal mixing speed is 50r/min, the temperature is 130 ℃, and the time is 15 min;
(3) adding sulfur, butadiene and tris (2, 4-di-tert-butylphenyl) phosphite into the material obtained in the step (2), uniformly mixing, and continuing to mix at 130 ℃ for 20min to obtain cured rubber powder;
(4) and (3) mixing the cured rubber powder obtained in the step (3) with No. 70A-grade asphalt, then placing the mixture in a high-speed shearing colloid mill at 150r/min and 170 ℃ for 50min, uniformly mixing, and then preserving heat at 130 ℃ for 2h to obtain the high-performance rubber asphalt.
Example 2
A high-performance rubber asphalt comprises the following components in parts by weight: 80 parts of No. 70A-grade asphalt with the penetration degree of 7mm and the softening point of more than 45 ℃, 19 parts of 35-mesh tire rubber powder, 1.3 parts of gutta percha, 0.7 part of butadiene, 0.6 part of sulfur, 0.07 part of dibenzoyl peroxide and 0.07 part of tris (2, 4-di-tert-butylphenyl) phosphite.
The preparation method of the high-performance rubber asphalt comprises the following steps:
(1) weighing No. 70A-grade asphalt, 35-mesh tire rubber powder, gutta-percha, butadiene, sulfur, dibenzoyl peroxide and tris (2, 4-di-tert-butylphenyl) phosphite for later use;
(2) placing the tire rubber powder, the eucommia ulmoides gum and the dibenzoyl peroxide weighed in the step (1) into an internal mixer for internal mixing, wherein the internal mixing speed is 50r/min, the temperature is 140 ℃, and the time is 13 min;
(3) adding sulfur, butadiene and tris (2, 4-di-tert-butylphenyl) phosphite into the material obtained in the step (2), uniformly mixing, and continuing to mix at 140 ℃ for 18min to obtain cured rubber powder;
(4) and (4) mixing the cured rubber powder obtained in the step (3) with asphalt, then placing the mixture in a high-speed shearing colloid mill at the temperature of 175 ℃ at 150r/min for 40min for uniformly mixing, and then preserving heat at the temperature of 140 ℃ for 1.5h to obtain the high-performance rubber asphalt.
Example 3
A high-performance rubber asphalt comprises the following components in parts by weight: 80 parts of No. 70A-grade asphalt with the penetration degree of 8mm and the softening point of more than 45 ℃, 20 parts of 40-mesh tire rubber powder, 1.5 parts of gutta percha, 1.0 part of butadiene, 0.8 part of sulfur, 0.1 part of dibenzoyl peroxide and 0.1 part of tris (2, 4-di-tert-butylphenyl) phosphite.
The preparation method of the high-performance rubber asphalt comprises the following steps:
(1) weighing No. 70A-grade asphalt, 40-mesh tire rubber powder, gutta-percha, butadiene, sulfur, dibenzoyl peroxide and tris (2, 4-di-tert-butylphenyl) phosphite for later use;
(2) placing the tire rubber powder, the eucommia ulmoides gum and the dibenzoyl peroxide weighed in the step (1) into an internal mixer for internal mixing, wherein the internal mixing speed is 50r/min, the temperature is 150 ℃, and the time is 10 min;
(3) adding sulfur, butadiene and tris (2, 4-di-tert-butylphenyl) phosphite into the material obtained in the step (2), uniformly mixing, and continuing to mix at 150 ℃ for 15min to obtain cured rubber powder;
(4) and (4) mixing the cured rubber powder obtained in the step (3) with asphalt, then placing the mixture in a high-speed shearing colloid mill at the temperature of 180 ℃ at the speed of 150r/min for 30min, uniformly mixing, and then preserving heat at the temperature of 150 ℃ for 1h to obtain the high-performance rubber asphalt.
Comparative example 1
The same procedure was used for the preparation of the same components as in example 1:
(1) weighing No. 70A road petroleum asphalt, 30-mesh tire rubber powder, gutta-percha, butadiene, sulfur, dibenzoyl peroxide and tris [2, 4-di-tert-butylphenyl ] phosphite according to parts by weight for later use;
(2) and (2) mixing the components obtained in the step (1), shearing at a high speed, uniformly mixing, and keeping the temperature to obtain the rubber asphalt.
Comparative example 2
The same components as in example 1, the mixing temperature in step (3) in the preparation process is 120 ℃, and the mixing time is 50 min.
Comparative example 3
The same components as in example 1, the mixing temperature in step (3) in the preparation process is 180 ℃, and the mixing time is 1 min.
Comparative example 4
The same preparation as in example 1, only the cured rubber powder material component was different. The cured rubber powder material comprises the following components: 30-mesh tyre rubber powder, gutta-percha, butadiene and sulfur.
Test examples
The rubber asphalts obtained in examples 1 to 3 and comparative examples 1 to 3 were subjected to a performance test according to the test method of road asphalt and asphalt mixture test protocol (JTGE 20-2011), and the test results are shown in table 1.
TABLE 1 test results of rubber modified asphalt Properties
Based on the experimental results, the modified asphalt prepared by the preparation method of the high-performance rubber asphalt disclosed by the invention has the asphalt pavement performance indexes such as three asphalt indexes and elastic recovery, which meet the standard requirements and are excellent in performance. As can be seen from the Bush rotational viscosity at 180 ℃, the rubber modified asphalt premixed by the internal mixer has obviously lower viscosity and lower construction workability, and can meet the construction quality in the actual engineering application.
The comparative example 1 mainly reflects the difference between the tire rubber powder and the mastic powder, compared with the mastic powder after banburying, the rubber modified asphalt directly prepared by the traditional method has higher consistency, higher viscosity and poorer low-temperature ductility due to the fact that the rubber powder cannot be fully swelled with the asphalt, is difficult to ensure the construction quality and the service life of the pavement, and increases the later maintenance cost of the pavement.
Comparative examples 2 and 3 are mainly intended to compare the effect of mixing temperature and time on the product. From the test results, although the influence brought by the banburying process is slightly less, the performance of the novel rubber modifier formula still cannot be exerted without proper mixing temperature and time, the performance indexes of each path are general, and the waste of materials and energy is caused in a certain sense.
Comparative example 4 is mainly intended to compare the influence of the composition of the cured rubber powder material. The test results show that the material composition of the cured rubber powder can also generate corresponding influence on the modification effect of the rubber powder, and various performance indexes of the asphalt are poor compared with the examples, which shows that the cured rubber powder material designed by the original example cannot have any composition, each material can play a certain role, and the modification effect of the subsequent asphalt can be influenced significantly.
Therefore, the comprehensive test results show that each link is very important no matter the formula of the novel rubber modifier disclosed by the invention, the banburying process and the modified asphalt preparation process are adopted, and the method has important effects on improving the performance of the rubber asphalt pavement, improving the service effect and the service life of the road and reducing the maintenance cost.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. The high-performance rubber asphalt is characterized by comprising the following components in parts by weight: 80 parts of asphalt, 18-20 parts of tire rubber powder, 1-1.5 parts of eucommia ulmoides gum, 0.5-1.0 part of butadiene, 0.4-0.8 part of sulfur, 0.05-0.1 part of initiator and 0.05-0.1 part of antioxidant.
2. The high-performance rubber asphalt of claim 1, wherein the asphalt is grade-70A road petroleum asphalt with penetration degree of 6-8mm and softening point of more than 45 ℃.
3. The high-performance rubber asphalt as claimed in claim 1, wherein the particle size of the tire rubber powder is 30-40 mesh.
4. The high-performance rubber asphalt as claimed in claim 1, wherein said initiator is dibenzoyl peroxide.
5. The high-performance rubber asphalt of claim 1, wherein the antioxidant is tris (2, 4-di-tert-butylphenyl) phosphite.
6. A method for preparing high-performance rubber asphalt according to claims 1 to 5, which is characterized by comprising the following steps:
(1) weighing asphalt, tire rubber powder, gutta percha, butadiene, sulfur, an initiator and an antioxidant according to parts by weight for later use;
(2) placing the tire rubber powder, the eucommia ulmoides gum and the initiator weighed in the step (1) into an internal mixer for banburying;
(3) adding sulfur, butadiene and an antioxidant into the material obtained in the step (2), uniformly mixing, and continuously mixing for 15-20min to obtain cured rubber powder;
(4) and (4) mixing the cured rubber powder obtained in the step (3) with asphalt, uniformly mixing the mixture in a high-speed shearing colloid mill, and then preserving heat to obtain the high-performance rubber asphalt.
7. The high-performance rubber asphalt as claimed in claim 6, wherein the banburying speed in step (2) is 50r/min, the temperature is 130-150 ℃, and the time is 10-15 min.
8. The high-performance rubber asphalt of claim 6, wherein the mixing temperature in step (3) is 130-150 ℃, and the mixing time is 15-20 min.
9. The high-performance rubber asphalt as claimed in claim 6, wherein the rotation speed of the high-speed shearing colloid mill in step (4) is 150r/min, the shearing temperature is 170-; the temperature is 130 ℃ and 150 ℃, and the time is 1-2 h.
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