CN111234547A - Environment-friendly low-grade hard asphalt modification method - Google Patents
Environment-friendly low-grade hard asphalt modification method Download PDFInfo
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- CN111234547A CN111234547A CN202010216350.7A CN202010216350A CN111234547A CN 111234547 A CN111234547 A CN 111234547A CN 202010216350 A CN202010216350 A CN 202010216350A CN 111234547 A CN111234547 A CN 111234547A
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- hard asphalt
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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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- 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
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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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
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/20—Recycled plastic
- C08L2207/24—Recycled plastic recycling of old tyres and caoutchouc and addition of caoutchouc particles
Abstract
The invention provides an environment-friendly low-grade hard asphalt modification method. The hard asphalt is added into a reactor, the rubber powder modifier is added at the temperature of 190-200 ℃, the mixture is stirred to fully swell the rubber powder, the temperature is reduced to 180-190 ℃, the thermoplastic rubber and the stabilizer are added into the asphalt according to a certain proportion under the condition of high-speed shearing, and the modified asphalt prepared by special equipment such as high shearing, stirring and the like has the characteristics of cold resistance, low temperature resistance, fatigue resistance, good aging resistance, high stability and low cost.
Description
Technical Field
The invention relates to the technical field of low-grade asphalt modification, in particular to low-grade composite modified asphalt with good low-temperature performance, fatigue resistance and aging resistance and a preparation method thereof.
Background
The rapid development of national economy brings overloaded traffic volume and axle load, and in addition, due to the comprehensive influence of factors such as pavement design, continuous high-temperature weather and the like, part of asphalt pavements have already appeared serious rutting phenomena and become one of the most serious damage forms of the current asphalt pavements. At present, the high-temperature anti-rutting performance of the asphalt mixture is improved mainly by adding a proper modifier into the asphalt so as to improve the high-temperature viscosity of the asphalt and improve the modulus and the anti-shearing capability of the asphalt, but the conventional modified asphalt is expensive in price, high in technical level requirement and easy to be limited by technical level and fund in the aspect of popularization and use, so that the conventional modified asphalt has certain limitation in use.
Hard asphalt as low-grade heavy traffic asphalt has the advantages of low penetration, high softening point, high stiffness, high viscosity and the like, and is low in price, wide in raw material source, simple and easy to obtain, so that the hard asphalt is concerned. However, in the prior art, for example, US4371401 provides for the preparation of high modulus asphalt mixtures from hard bitumen with a penetration of 5-201/10 mm and a softening point of 70-90 ℃ with specially screened aggregates and it is believed that polymers may also be added and then modified in order to improve the low temperature crack resistance. In US5759250, deoiled asphalt or straight-run asphalt with penetration degree of 0-251/10 mm and softening point above 60 ℃ is used as cementing material of a pavement base to improve the rutting resistance of a road. CN1148073A discloses the use of a stiff asphalt having a penetration in the range of 0-201/10 mm at 25 ℃ for the preparation of an asphalt-containing overlay for the construction or foundation reinforcement of roads, the asphalt content of the overlay being above 6%. The patent suggests that gilsonite can be used as a highway binding material because of its relatively high modulus, but only emphasizes that the rigidity of gilsonite material does not address its flexibility requirement. In the technology, the hard asphalt raw material is directly used as the cementing material, and the pavement paved by the asphalt mixture prepared by the technology probably has better high-temperature performance at the initial stage but does not have good low-temperature performance, fatigue resistance, aging resistance and other performances. The improvement in overall performance of the pavement is limited and transient.
For another example, CN101492570A discloses a hard road asphalt composition and a preparation method thereof, the hard road asphalt composition of the present invention has a low temperature grade up to PGxx-22, but the composition has higher contents of high grade base asphalt and softener, and lacks a low temperature ductility performance analysis, which is a key indicator of modified asphalt products. CN101608069A discloses a composite modified asphalt and a preparation method thereof, the obtained composite modified asphalt has outstanding low-temperature performance, good temperature sensitivity and wide use temperature range, the PG grade can reach PG76-28, but the modified asphalt product mainly takes matrix asphalt with the penetration of 60-1201/10 mm, and the mixing amount of hard asphalt is lower. Chinese granted patent CN102030942B, a cold-resistant and high-temperature-resistant composite material and a preparation method thereof, discloses a composite material prepared from the following raw materials in parts by weight: 20-30 parts of polyethylene, 5-10 parts of polyvinyl butyral resin, 10-15 parts of SBS, 10-20 parts of diatomite, 5-10 parts of EVA, 10-15 parts of ABS, 20-25 parts of SMN resin, 5-10 parts of JC-G530C reinforcing agent, 0.3-0.5 part of lignocellulose and 15-25% of nano calcium carbonate.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the modified asphalt which takes hard asphalt as a raw material and has excellent low-temperature performance, and has the characteristics of good fatigue resistance and aging resistance, high storage stability, low cost and simple preparation process.
Specifically, the invention provides a low-grade composite modified asphalt with cold resistance, fatigue resistance, aging resistance and good storage stability, which is characterized by comprising the following raw materials in parts by weight:
hard asphalt: 100 parts of (a) a water-soluble polymer,
rubber powder: 6-14 parts of (A) and (B),
polymer (b): 1-3 parts of (A) a solvent,
auxiliary agent: 0.3 to 0.8 portion.
The hard asphalt of the invention has the following properties: the penetration degree is 5-551/10 mm, the softening point is 45-120 ℃, and the solubility (analysis method is GB11148-1989, petroleum asphalt solubility determination method) is not less than 99 wt%. The hard asphalt is vacuum deep-drawing asphalt, solvent deoiled asphalt, oxidized asphalt, or blended hard asphalt.
The rubber powder is activated rubber powder produced by a normal temperature method, a normal temperature wet method or a normal temperature auxiliary agent method, a low temperature freezing method or a normal temperature auxiliary agent method, and has the size of 20-100 meshes.
The polymer of the invention is a polystyrene-butadiene-styrene block copolymer (SBS).
The SBS modifier is one or more of DouDaoqiao 2#, YH-791H, YH-792, YH-796, T6302H or LCY 3501.
The assistant is a stabilizer NH4L, YHL-1, SDY-1, S40, S60 or S90.
The invention also relates to a method for preparing the low-grade composite modified asphalt, which comprises the following four steps:
(1) firstly, drying environment-friendly low-grade hard asphalt at 150-180 ℃ to completely melt the asphalt, adding the hard asphalt heated to a flowing state into a reactor, and gradually heating the hard asphalt to 190-200 ℃ under the stirring condition.
(2) Adding rubber powder into the hard asphalt, stirring for 1.5-2.5 h at 3000-3500 rpm, and controlling the temperature at about 195 ℃ to fully swell the rubber powder modifier;
(3) reducing the temperature to 190 ℃ at 180 ℃ and adding SBS modifier under the high-speed shearing state of 3000 rpm-4000 rpm, shearing for 30-40min, then adding stabilizer and catalyst, and continuing shearing for 30-40 min;
(4) finally stirring for 3h at the temperature of 180 ℃ and 190 ℃ to fully develop to obtain the low-grade composite modified asphalt.
The rubber powder processed by waste tires comprises the main chemical components of natural rubber and synthetic rubber, and also comprises additional components such as sulfur, carbon black, silicon oxide, iron oxide and the like, however, the components are good modifiers of asphalt, can improve the high and low temperature performance, the ageing resistance and the fatigue resistance of the asphalt, and has the effects of thinning the road surface, prolonging the service life of the road surface, delaying reflection cracks, reducing the noise of the tires/the road surface and the like. In addition, the rubber powder is used as the asphalt modifier, so that the highway construction cost is reduced, the resources are saved, the black pollution caused by waste tires can be eliminated, the solid waste is fully recycled, and the asphalt modifier has high social benefit, environmental benefit and economic benefit.
The thermoplastic elastomer polystyrene-butadiene-styrene triblock copolymer (SBS) has excellent performance and is the most widely used road asphalt modifier at present. The SBS modifier is dispersed in the asphalt in the form of fine particles through physical methods such as high-speed stirring, shearing and the like to form a uniform interpenetrating network structure, strong interaction among networks limits the cohesion and flexibility of the asphalt, and reduces the sensitivity of the asphalt to temperature. In addition, the SBS has a plastic section and a rubber section, is different from the conventional vulcanized rubber, can improve the softening point and viscosity of the asphalt, and simultaneously can ensure that the asphalt still has flexibility at the temperature lower than the brittle point, so that the toughness of the asphalt is improved, and the effect of improving the low-temperature performance is better.
However, the compatibility of SBS, waste rubber powder and asphalt is poor. Because the polarity and molecular weight difference between SBS, waste rubber powder and matrix asphalt is large, SBS and waste rubber powder can not be melted in asphalt, and can only absorb components with similar polarity and solubility parameters to swell, and the method basically belongs to the physical action category. In addition, the compatibility between SBS and asphalt is poor, part of SBS is distributed in flocculent and granular shape, segregation and layering phenomena are easy to happen in the using process, and the modification effect of SBS modified asphalt is greatly reduced. However, the addition of the stabilizer can initiate the crosslinking reaction among SBS and the grafting reaction among SBS, waste rubber powder and matrix asphalt. The product of the grafting reaction exists among SBS, waste rubber powder and asphalt, and plays the role of a surfactant, so that the mutual surface tension is reduced, the separation of a modifier and the asphalt is prevented, and the stability of a dispersion system is improved, thereby achieving a better modification effect.
The invention adopts the composite modification technology to modify the environment-friendly low-grade hard asphalt, can obtain the composite modified asphalt product with good low-temperature performance, uniform dispersion and stable storage, has simple method, easy operation and lower energy consumption, and is beneficial to realizing the wide application of the environment-friendly low-grade hard asphalt in China.
Detailed Description
The environment-friendly low-grade hard asphalt and the preparation method thereof according to the present invention will be described in detail with reference to the following examples, but the present invention is not limited to the following examples.
The properties of the hard bitumen stocks used in the examples of the present invention are shown in table 1.
TABLE 1 basic Property index of hard asphalt raw Material
As can be seen from the basic properties of the hard asphalt raw materials listed in Table 1, the softening point and viscosity of the environment-friendly low-grade hard asphalt are improved to a certain extent compared with those of domestic common asphalt products, but the low-temperature indexes are poor, particularly, the ductility at 5 ℃ is zero, the ductility at 10 ℃ is also low, and the ductility at 10 ℃ of the asphalt after TFOT aging is brittle, so that the environment-friendly low-grade hard asphalt has very poor low-temperature cracking resistance and aging resistance, and cannot be directly used as a cementing material for preparing asphalt mixture paved roads.
Therefore, 4 low-grade composite modified asphalt samples were prepared according to the method and procedure described in this patent, the specific formulation and the SHRP evaluation results are shown in examples 1-4, and the evaluation results of the modified asphalt prepared by using the thermoplastic elastomer SBS as the modifier are shown as comparative examples.
Example one
Stirring 100 parts of No. 30 straight-run asphalt, heating to 200 ℃, adding 6 parts of 40-mesh waste rubber powder material, stirring at 3000rpm for 2 hours to fully swell the rubber powder, then cooling to 185 ℃, slowly adding 3 parts of SBS T6302 to shear for 40 minutes at the shear speed of 3500rpm, keeping the temperature at 185 ℃, adding 0.4 part of YHL-1 stabilizer and 0.2 part of catalyst to shear for 40 minutes, and finally stirring and developing at 185 ℃ for 3 hours to obtain the modified asphalt, wherein the main performance indexes of the obtained modified asphalt are shown in Table 2.
Example two
Stirring 100 parts of No. 30 oxidized asphalt, heating to 200 ℃, adding 10 parts of 60-mesh waste rubber powder material, stirring at 3500rpm, mixing for 2 hours to fully swell the rubber powder, cooling to 185 ℃, slowly adding 2 parts of SBS T6302H to shear for 40 minutes under the condition that the shearing speed is 3500rpm, keeping the temperature at 185 ℃, adding 0.3 part of YHL-1 stabilizer and 0.2 part of catalyst, shearing for 30 minutes, and finally stirring and developing for 3 hours at 185 ℃, wherein the main performance indexes of the obtained modified asphalt are shown in Table 2.
EXAMPLE III
Stirring 100 parts of No. 50 straight-run asphalt, heating to 195 ℃, adding 10 parts of 40-mesh waste rubber powder material, stirring at 3500rpm for 2 hours to fully swell the rubber powder, then cooling to 185 ℃, slowly adding 2 parts of SBS T6302 to shear for 40 minutes under the condition that the shearing speed is 3500rpm, keeping the temperature at 185 ℃, adding 0.3 part of YHL-1 stabilizer and 0.2 part of catalyst to shear for 40 minutes, and finally stirring and developing at 185 ℃ for 3 hours, wherein the main performance indexes of the obtained modified asphalt are shown in Table 2.
Example four
Heating 100 parts of No. 50 oxidized asphalt to 195 ℃ by stirring, adding 10 parts of 40-mesh waste rubber powder material, mixing for 2 hours under the stirring of 3500rpm to fully swell the rubber powder, then cooling to 185 ℃, slowly adding 2 parts of SBS T6302H to shear for 40 minutes under the condition that the shearing speed is 3500rpm, keeping the temperature at 185 ℃, adding 0.3 part of YHL-1 stabilizer and 0.2 part of catalyst to shear for 40 minutes, and finally stirring and developing for 3 hours at 185 ℃, wherein the main performance indexes of the obtained modified asphalt are shown in Table 2.
Comparative example
Heating 100 parts of No. 50 straight-run asphalt to 185 ℃ while stirring, slowly adding 4 parts of SBS T6302 to shear for 40min at a shearing speed of 3500rpm, then adding 0.6 part of YHL-1 stabilizer to shear for 40min, and finally stirring and developing for 3h at 180 ℃, wherein the main performance indexes of the obtained modified asphalt are shown in Table 2.
The main index test results of the prepared low-grade composite modified asphalt are shown in table 2.
TABLE 2 Low-grade composite modified asphalt Experimental data
As can be seen from the specific examples and the SHRP evaluation results, the composite modified asphalt prepared by the invention has the comprehensive performance obviously superior to that of the matrix asphalt and also superior to that of SBS modified asphalt. The high-temperature-resistant anti-cracking paint has good low-temperature-resistant anti-cracking performance, fatigue-resistant performance and aging-resistant performance while having good high-temperature performance, and has high storage stability, low cost and simple preparation process. Therefore, the composite modified asphalt prepared by the invention can completely or partially replace the matrix asphalt and the polymer modified asphalt and is applied to the fields of roads, buildings, water conservancy and the like.
Claims (10)
1. The environment friendly low grade hard asphalt features that during use, the sulfide content in the exhausted fume is reduced by 50%.
2. The environment-friendly low-grade hard asphalt modification method is characterized by comprising the following raw materials in parts by weight:
hard asphalt: 100 parts of (a) a water-soluble polymer,
waste rubber powder: 6-14 parts of (A) and (B),
polymer (b): 1-3 parts of (A) a solvent,
auxiliary agent: 0.3 to 0.8 portion.
3. The environmentally friendly low-grade hard asphalt according to claim 1, wherein the reduction of sulfide in the discharged flue gas is achieved by adding a carbon-based catalyst.
4. The environment-friendly low-grade hard asphalt according to claims 1 and 2, characterized in that the modified asphalt is an asphalt product of not less than PG 82-22.
5. The environment-friendly low-grade hard asphalt of claims 1 and 2, characterized in that the modified asphalt is a storage-stable asphalt product with a difference between upper and lower softening points of-2.5 ℃ to 2.5 ℃ after segregation test.
6. The environment-friendly low-grade hard asphalt according to claims 1 and 2, characterized in that the environment-friendly low-grade hard asphalt is asphalt with penetration of 5-55 and softening point of more than 45 ℃ prepared by straight run, oxidation, solvent deasphalting or blending process.
7. The environment-friendly low-grade hard asphalt as claimed in claims 1 and 2, wherein the crumb rubber powder is waste tire rubber powder passing through a sieve of not less than 20 meshes.
8. The environmentally friendly, low gauge, hard asphalt of claims 1 and 2, characterized in that the polymer is star-shaped or linear SBS (polystyrene-butadiene-styrene block copolymer).
9. The environment-friendly low-grade hard asphalt according to claims 1 and 2, wherein the auxiliary agent is a stabilizer such as NH specially used for modified asphalt4L, YHL-1, SDY-1, S40, S60 or S90.
10. The method for preparing environment-friendly low-grade hard asphalt according to any one of claims 1 to 9, which comprises the following steps:
(1) firstly, drying environment-friendly low-grade hard asphalt at 150-180 ℃ to completely melt the asphalt, adding the hard asphalt heated to a flowing state into a reactor, and gradually heating the hard asphalt to 190-200 ℃ under the stirring condition;
(2) adding rubber powder into the hard asphalt, stirring for 1.5-2.5 h at 3000-3500 rpm, and controlling the temperature at about 195 ℃ to fully swell the rubber powder modifier;
(3) reducing the temperature to 190 ℃ at 180 ℃ and adding SBS modifier under the high-speed shearing state of 3000 rpm-4000 rpm, shearing for 30-40min, then adding stabilizer and catalyst, and continuing shearing for 30-40 min;
(4) finally stirring for 3h at the temperature of 180 ℃ and 190 ℃ to fully develop to obtain the low-grade composite modified asphalt.
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Cited By (3)
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| CN112592596A (en) * | 2020-12-07 | 2021-04-02 | 江苏天诺道路材料科技有限公司 | Durable asphalt based on low-grade asphalt and preparation method thereof |
| CN112852176A (en) * | 2021-04-06 | 2021-05-28 | 山东京博石油化工有限公司 | High-modulus asphalt and preparation method thereof |
| CN115521629A (en) * | 2022-10-25 | 2022-12-27 | 江苏天诺道路材料有限公司 | Maintenance special asphalt and preparation method thereof |
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Application publication date: 20200605 |