CN114621596B - Preparation method of modified asphalt of polyamine modified polydopamine/oxidized crumb rubber - Google Patents
Preparation method of modified asphalt of polyamine modified polydopamine/oxidized crumb rubber Download PDFInfo
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Abstract
The invention discloses a preparation method of modified asphalt of polyamine modified polydopamine/oxidized crumb rubber, and particularly relates to a preparation method of modified asphalt of polyamine modified polydopamine/oxidized crumb rubber. The preparation method comprises the steps of preparing polyamine modified polydopamine and oxidized waste rubber powder, and mixing the polydopamine and the oxidized waste rubber powder; the mass ratio of the matrix asphalt, the oxidized waste rubber powder and the polyamine modified polydopamine is (70-95) to (5-30) to (0.1-5). Through the chemical oxidation technology on the surface of the waste rubber powder, the waste rubber powder and a polyamine modified polydopamine surface active functional group are mutually synergistic to form a composite net structure in the asphalt, so that the compatibility of the waste rubber powder in the asphalt can be effectively enhanced, the problem of segregation of the waste rubber powder in the asphalt is solved, the storage stability of the rubber modified asphalt is improved, the rubber asphalt pavement has excellent pavement performance, the service life of the asphalt pavement is effectively prolonged, and the subsequent maintenance cost is reduced. The invention is applied to the technical field of modified asphalt preparation.
Description
Technical Field
The invention belongs to the technical field of modified asphalt preparation, and particularly relates to a preparation method of modified asphalt of polyamine modified polydopamine/oxidized crumb rubber.
Background
The quantity of highway infrastructure in China is huge, and by the end of 2020, the total highway mileage in China is 519.8 kilometers, and the total maintenance mileage is 514.4 kilometers, wherein the asphalt pavement accounts for more than 90%. The demand of asphalt pavement construction and maintenance work on the scale for high-quality asphalt materials is increased year by year, and common petroleum asphalt has high temperature sensitivity, high-temperature flowing and low-temperature brittle fracture due to the composition and structural characteristics of the asphalt, is poor in aging resistance and short in service life, and is difficult to meet the use demand of high-grade highways. The developed modified asphalt technology, particularly the polymer modified asphalt technology, has proved to be capable of well solving the problems that the traditional asphalt material has weak performance and is difficult to be directly used for high-grade highway construction and maintenance. On the other hand, with the development of the automobile industry, the increasing quantity of the automobile in China causes the problem that the waste rubber tires are difficult to be stacked in a centralized manner. According to statistics, the generation amount of waste tires in China is about 5.2 hundred million in 2020, nearly 2000 ten thousand tons, and the annual growth rate reaches 8-10%, but the recycling rate of the tires is extremely low at present and is less than forty percent. The mass accumulation of the waste tires not only causes resource waste, but also causes fire and environmental pollution due to long-term accumulation. Therefore, from the perspective of environmental protection and economic development of rubber materials, how to better utilize waste tires and solve the problem of black pollution becomes a problem which needs to be solved urgently at present.
The method for preparing the waste rubber powder from the waste rubber tires is internationally recognized as a method for resource utilization and harmless treatment of the waste tires. The waste tyre mainly comprises natural rubber and synthetic rubber (such as styrene butadiene rubber and butadiene rubber), and also comprises additive components such as carbon black, sulfur, iron oxide, silicon oxide, calcium oxide and the like. In the field of pavement engineering, the waste rubber powder can be used as an asphalt modifier with excellent performance, can improve various pavement performances of asphalt, and also has the effects of reducing the thickness of a pavement, prolonging the service life of the pavement, reducing the noise of the pavement and the like. Therefore, the waste tires are used for constructing the asphalt pavement, the problem of processing the waste tires can be well solved, the service performance of the asphalt pavement material can be improved, the cost of the modified asphalt is reduced, and the method has very remarkable economic and social benefits.
However, rubber modified asphalt still has some problems, such as: poor storage stability, high viscosity and discharge of harmful substances, wherein the segregation of the waste rubber powder from an asphalt system is taken as the main point. The poor thermodynamic compatibility of the waste rubber powder and the asphalt and the density difference between the waste rubber powder and the asphalt cause the poor storage stability of the rubber modified asphalt, so that the rubber modified asphalt must be used within 1 to 2 days after the preparation or directly prepared on site, the performance of the asphalt is continuously attenuated in the storage and use processes, and the popularization and the application of the rubber modified asphalt are undoubtedly limited.
Disclosure of Invention
The invention aims to solve the problems that segregation phenomena can be generated among all components due to poor compatibility of waste rubber powder and asphalt in the process of storing rubber modified asphalt, and the road service performance of the rubber modified asphalt can be influenced by the segregation among all the components, and provides a preparation method of modified asphalt of polyamine modified polydopamine/oxidized waste rubber powder.
The invention discloses a preparation method of modified asphalt of polyamine modified polydopamine/oxidized crumb rubber, which comprises the following steps:
1. preparation of polyamine modified polydopamine
Dissolving polyamine substances in water to prepare a solution of the polyamine substances, then adding dopamine hydrochloride, reacting under the conditions of constant temperature and magnetic stirring, and after the reaction is finished, drying a product on the surface of a filter membrane through vacuum filtration to obtain polyamine-modified polydopamine;
2. oxidized waste rubber powder
Dispersing waste rubber powder in water, adding an oxidant, reacting under the conditions of constant temperature and stirring, washing after the reaction is finished, and drying to obtain oxidized waste rubber powder;
3. preparation of modified asphalt
Mixing the polyamine modified polydopamine and the oxidized waste rubber powder, then putting the mixture into matrix asphalt, uniformly dispersing the mixture in the matrix asphalt at a constant shearing rate under a constant temperature condition, and shearing and developing for 1.5 hours to obtain the modified asphalt of the polyamine modified polydopamine/oxidized waste rubber powder.
The beneficial effects of the invention are:
(1) The polyamine modified polydopamine is prepared by oxidative autopolymerization of dopamine, the autopolymerization process of the dopamine is essentially a free radical reaction process, the dopamine and a quinoid structure of the dopamine generate a semiquinoid free radical through a single electron transfer reaction, and finally the polymerization process of the dopamine is realized through a coupling reaction of the free radical. The synthesis method adopted by the invention is green and pollution-free, has low requirements on equipment, and does not need to provide additional energy. Compared with the dispersion liquid of commercial polydopamine, the dispersion liquid of the polyamine-modified polydopamine prepared by the invention has higher absorbance, which shows that the polyamine-modified polydopamine has higher polymerization degree and more abundant surface functional groups;
(2) In the invention, the waste rubber powder is subjected to oxidation treatment. Oxygen-containing functional groups are generated on the surface of the waste rubber powder, and polyamine modified polydopamine plays a role of a bridge in rubber powder and asphalt, on one hand, the polyamine modified polydopamine contains rich phenolic hydroxyl groups and can form a hydrogen bond effect with oxidized waste rubber powder to form a composite network structure in the asphalt, and on the other hand, the prepared polyamine modified polydopamine has rich amino groups and can form a covalent bond effect with an acid component in the asphalt and is easy to disperse uniformly in the asphalt. The two aspects act together, so that the acting force of the three aspects is enhanced, and the compatibility of the waste rubber powder in the asphalt can be effectively improved;
(3) The modified asphalt based on polyamine modified polydopamine/oxidized crumb rubber is added, so that the stability of the crumb rubber in the asphalt is enhanced, the problem of segregation of the crumb rubber in the asphalt is solved, the storage stability of the rubber modified asphalt is improved, the rubber asphalt pavement has excellent pavement performance, the service life of the asphalt pavement is effectively prolonged, and the subsequent maintenance cost is reduced.
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FIG. 1 is a test chart of ultraviolet absorption spectra of polyamine modified polydopamine and commercially available polydopamine prepared by the method; wherein a is polyamine modified polydopamine prepared by the method, and b is commercially available polydopamine;
FIG. 2 shows a sample of the crumb rubber modified asphalt of comparative example one after being stored at 163 ℃ for 48 hours;
FIG. 3 shows polyamine-modified polydopamine/oxidized crumb rubber modified asphalt of example 5 stored at 163 ℃ for 48 h.
Detailed Description
The first embodiment is as follows: the preparation method of the modified asphalt containing polyamine modified polydopamine/oxidized crumb rubber powder comprises the following steps:
1. preparation of polyamine modified polydopamine
Dissolving polyamine substances in water to prepare a solution of the polyamine substances, then adding dopamine hydrochloride, reacting under the conditions of constant temperature and magnetic stirring, and after the reaction is finished, drying a product on the surface of a filter membrane through vacuum filtration to obtain polyamine-modified polydopamine;
2. oxidized waste rubber powder
Dispersing waste rubber powder in water, adding an oxidant, reacting under the conditions of constant temperature and stirring, washing after the reaction is finished, and drying to obtain oxidized waste rubber powder;
3. preparation of modified asphalt
Mixing the polyamine modified polydopamine and the oxidized waste rubber powder, then putting the mixture into matrix asphalt, uniformly dispersing the mixture in the matrix asphalt at a constant shearing rate under a constant temperature condition, and shearing and developing for 1.5 hours to obtain the modified asphalt of the polyamine modified polydopamine/oxidized waste rubber powder.
In the third step of the embodiment, polyamine modified polydopamine and oxidized waste rubber powder are placed into a small laboratory three-dimensional mixer, and the mixing is carried out for 10-60min by controlling the rotating speed to be 5-24 r/min.
The second embodiment is as follows: the first difference between the present embodiment and the specific embodiment is: in the first step, the mass ratio of the dopamine hydrochloride, the polyamine substance and the water is (1-10) to (1-40) to (500-1000). The rest is the same as the first embodiment.
The third concrete implementation mode: this embodiment is different from the first or second embodiment in that: the polyamine substance is diethylenetriamine, triethylenetetramine, tetraethylenepentamine, pentaethylenehexamine or polyethyleneimine. The other steps are the same as in the first or second embodiment.
The fourth concrete implementation mode: the difference between this embodiment mode and one of the first to third embodiment modes is: the reaction in the first step under the conditions of constant temperature and magnetic stirring means that the reaction is carried out by heating to 20-80 ℃ at constant temperature, the rotating speed is 50-600r/min, and the reaction time is 2-24h. The other steps are the same as those in the first to third embodiments.
The fifth concrete implementation mode: the difference between this embodiment and one of the first to fourth embodiments is: the particle size of the polyamine modified polydopamine obtained in the first step is 0.1-5 mu m. The other steps are the same as those in the first to fourth embodiments.
The sixth specific implementation mode: the difference between this embodiment and one of the first to fifth embodiments is: in the second step, the mass ratio of the waste rubber powder to the oxidant to the water is (8-20) to (1-15) to (50-200). The other steps are the same as those in the first to fifth embodiments.
The seventh embodiment: the difference between this embodiment and one of the first to sixth embodiments is: the oxidant is hydrogen peroxide, sodium hypochlorite, potassium permanganate, benzoyl peroxide, a mixture of hydrogen peroxide and ferrous sulfate or a mixture of hydrogen peroxide and sodium tungstate. The other steps are the same as those in the first to sixth embodiments.
In the embodiment, the mixture of the hydrogen peroxide and the ferrous sulfate is mixed according to any mass ratio; the mixture of hydrogen peroxide and sodium tungstate is mixed according to any mass ratio.
The specific implementation mode is eight: the difference between this embodiment and one of the first to seventh embodiments is: the reaction in the second step under the conditions of constant temperature and stirring means that the reaction is carried out by heating to 40-100 ℃ at constant temperature, the rotating speed is controlled to be 600-1200r/min, and the reaction time is 1-8h. The other steps are the same as those in the first to seventh embodiments.
The specific implementation method nine: the present embodiment differs from the first to eighth embodiments in that: in the third step, the mass ratio of the matrix asphalt, the oxidized waste rubber powder and the polyamine modified polydopamine is (70-95): (5-30): 0.1-5. The other steps are the same as those in the first to eighth embodiments.
The detailed implementation mode is ten: the difference between this embodiment and one of the first to ninth embodiments is that: and in the third step, when the polyamine modified polydopamine and the oxidized waste rubber powder are mixed into the asphalt, the temperature is controlled to be 120-200 ℃, and the polyamine modified polydopamine and the oxidized waste rubber powder are sheared and dispersed at the rotating speed of 1000-10000 r/min. The other steps are the same as those in the first to ninth embodiments.
The following examples were used to demonstrate the beneficial effects of the present invention:
example 1, a method for preparing modified asphalt of polyamine-modified polydopamine/oxidized crumb rubber powder comprises the following steps:
1. preparation of polyamine modified polydopamine
Preparing 10g/L of diethylenetriamine solution, then adding 2g of dopamine hydrochloride into each liter of diethylenetriamine solution, reacting for 3 hours under the conditions of 30 ℃ and 100r/min magnetic stirring, and after the reaction is finished, drying a filter membrane surface product to obtain the polyamine modified polydopamine.
2. Oxidized waste rubber powder
Dispersing 120g of waste rubber powder into 1L of water, then adding 30g of hydrogen peroxide, reacting for 2 hours under the magnetic stirring condition of 40 ℃ and 600r/min, repeatedly washing with deionized water or absolute ethyl alcohol after the reaction is finished, and drying to obtain the oxidized waste rubber powder.
3. Preparation of modified asphalt
Putting the dried polyamine modified polydopamine and oxidized waste rubber powder into a small-sized laboratory three-dimensional mixer, mixing for 10min at the rotating speed of 5r/min, then taking out, putting into matrix asphalt, controlling the temperature to 140 ℃ under the constant temperature condition, controlling the rotating speed of a high-speed shearing emulsifying machine to be 3000r/min, uniformly dispersing the high-speed shearing emulsifying machine in the asphalt, and shearing and developing for 1.5h to obtain modified asphalt of the polyamine modified polydopamine/oxidized waste rubber powder; the mass ratio of the matrix asphalt to the oxidized waste rubber powder to the polyamine-modified polydopamine is 94.5.
Embodiment 2, a method for preparing modified asphalt from polyamine-modified polydopamine/oxidized crumb rubber comprises the following steps:
1. preparation of polyamine modified polydopamine
Preparing 4g/L of triethylene tetramine solution, then adding 1.5g of dopamine hydrochloride into each liter of triethylene tetramine solution, reacting for 4 hours under the magnetic stirring condition of 300r/min at 40 ℃, and after the reaction is finished, drying the product on the surface of the filter membrane through vacuum filtration to obtain the polyamine modified polydopamine.
2. Oxidized waste rubber powder
Dispersing 100g of waste rubber powder in 1L of water, adding 25g of sodium hypochlorite, reacting for 3 hours under the conditions of 60 ℃ and 800r/min magnetic stirring, repeatedly washing with deionized water or absolute ethyl alcohol after the reaction is finished, and drying to obtain the oxidized waste rubber powder.
3. Preparation of modified asphalt
Putting the dried polyamine modified polydopamine and oxidized waste rubber powder into a small-sized laboratory three-dimensional mixer, mixing for 20min at the rotating speed of 15r/min, then taking out, putting into matrix asphalt, controlling the rotating speed of a high-speed shearing emulsifying machine to be 6000r/min under the constant temperature condition of regulating and controlling the temperature to 160 ℃, uniformly dispersing the matrix asphalt in the asphalt, and shearing and developing for 1.5h to obtain the modified asphalt of the polyamine modified polydopamine/oxidized waste rubber powder; wherein the mass ratio of the matrix asphalt, the oxidized waste rubber powder and the polyamine modified polydopamine is 89.
Embodiment 3, a method for preparing modified asphalt from polyamine-modified polydopamine/oxidized crumb rubber comprises the following steps:
1. preparation of polyamine modified polydopamine
Preparing 2.5g/L tetraethylenepentamine solution, then adding 1.3g of dopamine hydrochloride into each liter of tetraethylenepentamine solution, reacting for 12 hours under the magnetic stirring condition of 400r/min at 50 ℃, and after the reaction is finished, drying the product on the surface of the filter membrane after vacuum filtration to obtain the polyamine modified polydopamine.
2. Oxidized waste rubber powder
Dispersing 110g of waste rubber powder in 1L of water, then adding 40g of potassium permanganate, reacting for 4 hours under the conditions of magnetic stirring at 70 ℃ and 900r/min, repeatedly washing with deionized water or absolute ethyl alcohol after the reaction is finished, and drying to obtain oxidized waste rubber powder.
3. Preparation of modified asphalt
Putting the dried polyamine modified polydopamine and oxidized waste rubber powder into a small laboratory three-dimensional mixer, mixing at the rotating speed of 20r/min for 30min, taking out, putting into matrix asphalt, regulating and controlling the temperature to 190 ℃, controlling the rotating speed of a high-speed shearing emulsifying machine at 7000r/min under the constant temperature condition, uniformly dispersing the matrix asphalt in the asphalt, and shearing and developing for 1.5h to obtain modified asphalt of polyamine modified polydopamine/oxidized waste rubber powder; wherein the mass ratio of the matrix asphalt, the oxidized waste rubber powder and the polyamine modified polydopamine is 82.5.
Example 4, a method for preparing modified asphalt from polyamine-modified polydopamine/oxidized crumb rubber comprises the following steps:
1. preparation of polyamine modified polydopamine
Preparing 5g/L of pentaethylene hexamine solution, then adding 1.2g of dopamine hydrochloride into each liter of pentaethylene hexamine solution, reacting for 18 hours under the conditions of 75 ℃ and 500r/min magnetic stirring, and after the reaction is finished, carrying out vacuum filtration, and drying the product on the surface of the filter membrane to obtain the polyamine modified polydopamine.
2. Oxidized waste rubber powder
Dispersing 130g of waste rubber powder in 1L of water, then adding 40g of benzoyl peroxide, reacting for 6 hours under the conditions of 85 ℃ and 1000r/min of magnetic stirring, repeatedly washing with deionized water or absolute ethyl alcohol after the reaction is finished, and drying to obtain the oxidized waste rubber powder.
3. Preparation of modified asphalt
Putting the dried polyamine modified polydopamine and oxidized waste rubber powder into a small-sized laboratory three-dimensional mixer, mixing for 40min at the rotating speed of 20r/min, then taking out, putting into matrix asphalt, regulating and controlling the temperature to 200 ℃, controlling the rotating speed of a high-speed shearing emulsifying machine to 8000r/min under the constant temperature condition, uniformly dispersing the matrix asphalt in the asphalt, and shearing and developing for 1.5h to obtain the modified asphalt of the polyamine modified polydopamine/oxidized waste rubber powder; wherein the mass ratio of the matrix asphalt, the oxidized waste rubber powder and the polyamine modified polydopamine is (77).
Example 5, a method for preparing modified asphalt from polyamine-modified polydopamine/oxidized crumb rubber powder comprises the following steps:
1. preparation of polyamine modified polydopamine
Preparing 6g/L of polyethyleneimine solution, adding 2g of dopamine hydrochloride into each liter of polyethyleneimine solution, reacting for 24 hours under the magnetic stirring condition of 60 ℃ and 400r/min, and after the reaction is finished, performing vacuum filtration, and drying a product on the surface of a filter membrane to obtain the polyamine modified polydopamine.
2. Oxidized waste rubber powder
Dispersing 120g of waste rubber powder in 1L of water, then adding 30g of hydrogen peroxide and 15g of ferrous sulfate, reacting for 4 hours under the magnetic stirring condition of 1200r/min at 80 ℃, repeatedly washing with deionized water or absolute ethyl alcohol after the reaction is finished, and drying to obtain the oxidized waste rubber powder.
3. Preparation of modified asphalt
Putting the dried polyamine modified polydopamine and oxidized waste rubber powder into a small-sized laboratory three-dimensional mixer, mixing for 30min at the rotating speed of 24r/min, then taking out, putting into matrix asphalt, controlling the rotating speed of a high-speed shearing emulsifying machine to 4000r/min under the constant temperature condition of regulating and controlling the temperature to 180 ℃, uniformly dispersing the matrix asphalt in the asphalt, and shearing and developing for 1.5h to obtain modified asphalt of the polyamine modified polydopamine/oxidized waste rubber powder; wherein the mass ratio of the matrix asphalt, the oxidized waste rubber powder and the polyamine modified polydopamine is (80).
Comparative example one: in this comparative example, unoxidized modified waste rubber powder was added
Under the condition of constant temperature of 180 ℃, mixing the waste rubber powder into the asphalt, controlling the rotating speed of a high-speed shearing emulsifying machine to be 4000r/min so as to uniformly disperse the waste rubber powder into the asphalt, and swelling and developing for 1.5h to obtain the waste rubber powder modified asphalt; wherein the mass ratio of the waste rubber powder to the asphalt is 18.
Comparative example two: in this comparative example, oxidized crumb powder and commercially available polydopamine were added
1. Oxidized waste rubber powder
Dispersing 120g of waste rubber powder in 1L of water, then adding 30g of hydrogen peroxide and 15g of ferrous sulfate, reacting for 4 hours under the magnetic stirring condition of 1200r/min at 80 ℃, repeatedly washing with deionized water or absolute ethyl alcohol after the reaction is finished, and drying to obtain the oxidized waste rubber powder.
2. Preparation of modified asphalt
Putting dried commercial polydopamine and oxidized waste rubber powder into a small laboratory three-dimensional mixer, mixing for 30min at the rotating speed of 24r/min, taking out, putting into matrix asphalt, regulating and controlling the temperature to 180 ℃, controlling the rotating speed of a high-speed shearing emulsifying machine to 4000r/min under the constant temperature condition, uniformly dispersing the polydopamine/oxidized waste rubber powder into the asphalt, and shearing and developing for 1.5h to obtain the polydopamine/oxidized waste rubber powder modified asphalt; wherein the mass ratio of the matrix asphalt to the oxidized waste rubber powder to the polydopamine is (80).
The segregation pipe sample of the modified asphalt was placed in a constant temperature environment of 163 ℃ for 48 hours, and the difference in softening point between the upper and lower ends thereof was measured, and the results of the test on the asphalt samples of examples 1 to 5 and comparative examples 1 and 2 are shown in table 1:
table 1 test results of asphalt samples of examples 1 to 5 and comparative examples 1 and 2
As can be seen from Table 1, the modified asphalt of polyamine-modified polydopamine/oxidized crumb rubber has a certain improvement in performance compared with the crumb rubber modified asphalt. The segregation softening point difference of the polyamine-modified polydopamine/oxidized waste rubber powder modified asphalt is smaller than that of the waste rubber powder modified asphalt, so that the phenolic hydroxyl of the polyamine-modified polydopamine and the waste rubber powder form a hydrogen bond effect, the polyamine and an asphalt acid component form a covalent bond effect, the polyamine-modified polydopamine/oxidized waste rubber powder and the polyamine-modified polydopamine/oxidized waste rubber powder have a synergistic effect, the compatibility of the waste rubber powder in the asphalt is enhanced together, and the waste rubber powder can still be normally used after being stored for 48 hours. Compared with the commercial polydopamine, the polyamine modified polydopamine prepared by the method has more obvious effects of enhancing the performance of modified asphalt and the compatibility of rubber powder and asphalt, and can be attributed to the fact that the polyamine modified polydopamine has better surface activity and can form tighter physical and chemical effects with oxidized waste rubber powder, so that the compatibility of the waste rubber powder in the asphalt is further improved. Fig. 1 is a test chart of ultraviolet absorption spectra of the polyamine-modified polydopamine and the commercially available polydopamine, and it can be found from fig. 1 that a self-made dispersion of the polyamine-modified polydopamine has higher absorbance than a commercially available dispersion of the polydopamine, which indicates that the polyamine-modified polydopamine has higher polymerization degree and more abundant surface functional groups.
The sample of the crumb rubber modified asphalt of comparative example one after storage at 163 ℃ for 48h is shown in figure 2, where a is the upper end; b is the lower end; as is evident from FIG. 2, the waste crumb rubber is separated in the asphalt after the waste crumb rubber modified asphalt is subjected to thermal storage, and the waste crumb rubber is enriched at the bottom end of the separation pipe because the density of the waste crumb rubber is higher than that of the asphalt. The sample of polyamine modified polydopamine/oxidized crumb rubber modified asphalt stored for 48 hours at 163 ℃ is shown in figure 3, wherein a is the upper end; b is the lower end; as can be seen from FIG. 3, after the polyamine-modified polydopamine/oxidized crumb rubber powder is subjected to thermal storage, the particles of the modified asphalt at the upper end and the lower end are obvious and basically have no difference, which also indicates that the polyamine-modified polydopamine and the oxidized crumb rubber powder have a certain synergistic effect, and the compatibility of the crumb rubber powder in the asphalt is improved.
While the embodiments of the present invention have been described, the present invention is not limited to the above-mentioned embodiments, which are only illustrative and not restrictive, and those skilled in the art can make many modifications without departing from the spirit and scope of the present invention as defined in the appended claims.
Claims (6)
1. A preparation method of modified asphalt of polyamine modified polydopamine/oxidized crumb rubber is characterized by comprising the following steps:
1. preparation of polyamine modified polydopamine
Dissolving polyamine substances in water to prepare a solution of the polyamine substances, then adding dopamine hydrochloride, reacting under the conditions of constant temperature and magnetic stirring, and after the reaction is finished, drying a filter membrane surface product through vacuum filtration to obtain polyamine-modified polydopamine; wherein the mass ratio of the dopamine hydrochloride, the polyamine substance and the water is (1-10): (1-40): 500-1000); the polyamine substance is diethylene triamine, triethylene tetramine, tetraethylene pentamine, pentaethylene hexamine or polyethylene imine;
2. oxidized waste rubber powder
Dispersing the waste rubber powder in water, adding an oxidant, reacting under the conditions of constant temperature and stirring, washing after the reaction is finished, and drying to obtain oxidized waste rubber powder; wherein the mass ratio of the waste rubber powder to the oxidant to the water is (8-20) to (1-15) to (50-200); the oxidant is hydrogen peroxide, sodium hypochlorite, potassium permanganate, benzoyl peroxide, a mixture of hydrogen peroxide and ferrous sulfate or a mixture of hydrogen peroxide and sodium tungstate;
3. preparation of modified asphalt
Mixing the polyamine modified polydopamine and the oxidized waste rubber powder, then putting the mixture into matrix asphalt, uniformly dispersing the mixture in the matrix asphalt at a constant shearing rate under a constant temperature condition, and shearing and developing for 1.5 hours to obtain the modified asphalt of the polyamine modified polydopamine/oxidized waste rubber powder.
2. The method for preparing modified asphalt from polyamine-modified polydopamine/oxidized crumb rubber according to claim 1, wherein the method comprises the following steps: the reaction in the first step under the conditions of constant temperature and magnetic stirring means that the reaction is carried out by heating to 20-80 ℃ at constant temperature, the rotating speed is 50-600r/min, and the reaction time is 2-24h.
3. The method for preparing modified asphalt from polyamine-modified polydopamine/oxidized crumb rubber according to claim 1, wherein the method comprises the following steps: the particle size of the polyamine modified polydopamine obtained in the first step is 0.1-5 mu m.
4. The method for preparing modified asphalt of polyamine-modified polydopamine/oxidized crumb rubber according to claim 1, which is characterized by comprising the following steps: and the reaction in the second step under the conditions of constant temperature and stirring means that the reaction is carried out by heating to 40-100 ℃ at constant temperature, controlling the rotating speed to 600-1200r/min and controlling the reaction time to 1-8h.
5. The method for preparing modified asphalt from polyamine-modified polydopamine/oxidized crumb rubber according to claim 1, wherein the method comprises the following steps: in the third step, the mass ratio of the matrix asphalt, the oxidized waste rubber powder and the polyamine modified polydopamine is (70-95): (5-30): 0.1-5).
6. The method for preparing modified asphalt from polyamine-modified polydopamine/oxidized crumb rubber according to claim 1, wherein the method comprises the following steps: and in the third step, when the polyamine-modified polydopamine and the oxidized waste rubber powder are mixed into the asphalt, the temperature is controlled to be 120-200 ℃, and the polyamine-modified polydopamine and the oxidized waste rubber powder are sheared and dispersed at the rotating speed of 1000-10000 r/min.
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| CN115093714A (en) * | 2022-07-19 | 2022-09-23 | 福建省春天生态科技股份有限公司 | Asphalt for road curing and repairing and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000328505A (en) * | 1999-03-18 | 2000-11-28 | Obayashi Road Corp | Asphalt pavement method for filming surface with aqueous resin solution and asphalt pavement structure |
| CN110092604A (en) * | 2019-05-20 | 2019-08-06 | 长沙理工大学 | A method of improving asphalt and aggregate interfacial adhesion performance |
| CN110872449A (en) * | 2018-08-30 | 2020-03-10 | 中国石油化工股份有限公司 | Waste rubber powder modified asphalt and preparation method thereof |
| CN111440595A (en) * | 2020-05-08 | 2020-07-24 | 北京中德建基路桥工程技术有限公司 | Crack agent and crack plaster using the same |
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- 2022-03-25 CN CN202210300877.7A patent/CN114621596B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000328505A (en) * | 1999-03-18 | 2000-11-28 | Obayashi Road Corp | Asphalt pavement method for filming surface with aqueous resin solution and asphalt pavement structure |
| CN110872449A (en) * | 2018-08-30 | 2020-03-10 | 中国石油化工股份有限公司 | Waste rubber powder modified asphalt and preparation method thereof |
| CN110092604A (en) * | 2019-05-20 | 2019-08-06 | 长沙理工大学 | A method of improving asphalt and aggregate interfacial adhesion performance |
| CN111440595A (en) * | 2020-05-08 | 2020-07-24 | 北京中德建基路桥工程技术有限公司 | Crack agent and crack plaster using the same |
Non-Patent Citations (1)
| Title |
|---|
| Boosting the mechanical and fracture resistance of asphalt via biomimetic poly dopamine-octadecylamine aramid fiber interface;Zhaorong Zhu等;《J Appl Polym Sci》;20211231;第1-14页 * |
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