Environment-friendly low-smoke waste rubber powder asphalt and preparation method thereof

Abstract

The invention discloses environment-friendly low-smoke waste rubber powder asphalt and a preparation method of the environment-friendly low-smoke waste rubber powder asphalt, and relates to the field of petroleum asphalt modification.The environment-friendly low-smoke waste rubber powder asphalt is composed of, by weight, 0.1-0.5 part of heavy aromatic oil; 0.05 part by weight to 0.15 part by weight of tar from a rubber factory; 0.05 part by weight to 0.1 part by weight of isocyclocitral; 0.03 part by weight to 0.05 part by weight of diphenyl pentanedione carboxylic ester; 0.2 part by weight to 0.4 part by weight of lauryl alcohol polyoxyethylene ether carboxylate symmetrical type succinic acid diester; 15 to 30 parts by weight of waste rubber powder; and 100 parts by weight of matrix asphalt. According to the environment-friendly low-smoke waste rubber powder asphalt and the preparation method thereof, the production temperature is low, the production time is shortened, harmful gas emission is reduced, energy is saved, the environment is protected, and meanwhile the problem of segregation caused by poor compatibility of waste rubber powder and asphalt and the problem that waste rubber powder particles block an equipment nozzle in the construction process are solved.

Description

Technical Field

[0001] The invention relates to the technical field of petroleum asphalt modification, and in particular to an environmentally friendly low-smoke waste rubber powder asphalt and a preparation method thereof. Background Art

[0002] Waste rubber powder asphalt is made by adding waste rubber powder to asphalt. Waste rubber powder is mainly made by crushing waste tires, rubber shoes, rubber hoses and tapes, and is relatively cheap. When waste rubber powder is added to asphalt, it can absorb the light oil in the asphalt, causing it to swell and degrade, which can improve the high and low temperature performance of asphalt, especially the low temperature performance.

[0003] At present, the preparation temperature of existing waste rubber powder asphalt is relatively high, usually above 220°C, and it requires high-temperature development for several hours. Waste rubber powder degraded at high temperature will produce harmful gases such as hydrogen sulfide, sulfur dioxide and organic amines, which have an extremely unpleasant smell. It will not only cause certain pollution to the environment, but also cause certain harm to the health of production and construction personnel. And when the asphalt products containing waste rubber powder particles are sprayed, the undissolved waste rubber powder particles sometimes clog the equipment nozzle, resulting in the inability to carry out normal construction and slowing down the construction progress. In addition, due to the poor compatibility between waste rubber powder and asphalt, segregation will occur during the storage of asphalt. In summary, the existing asphalt containing waste rubber powder is increasingly unable to meet market demand. Summary of the invention

[0004] In view of the problems existing in the above-mentioned prior art, the present invention aims to provide an environmentally friendly low-smoke waste rubber powder asphalt and a preparation method thereof, so as to reduce the production temperature, shorten the time, and reduce the emission of harmful gases, thereby meeting environmental protection requirements and effects, and at the same time solving the segregation problem caused by the poor compatibility of waste rubber powder and asphalt and the problem of waste rubber powder particles blocking the equipment nozzle during construction.

[0005] The technical solution adopted by the present invention to solve the technical problem is as follows:

[0006] The environmentally friendly low-smoke waste rubber powder asphalt of the present invention is composed of the following components in parts by weight:

[0007] 0.1 to 0.5 parts by weight of heavy aromatic oil;

[0008] 0.05 to 0.15 parts by weight of rubber factory tar;

[0009] 0.05 to 0.1 parts by weight of isocyclic citral;

[0010] 0.03 to 0.05 parts by weight of diphenylpentanedione carboxylate;

[0011] 0.2 to 0.4 parts by weight of symmetrical succinic acid diester of lauryl alcohol polyoxyethylene ether carboxylate;

[0012] 15 to 30 parts by weight of waste rubber powder;

[0013] 100 parts by weight of base asphalt.

[0014] The method for preparing the environmentally friendly low-smoke waste rubber powder asphalt of the present invention comprises the following steps:

[0015] After heating the heavy aromatic oil, add the rubber factory tar, keep the temperature constant, add isocyclic citral and diphenylpentanedione carboxylate after cooling, and stir evenly to obtain the admixture; after heating the waste rubber powder, add the admixture dropwise, heat the resulting mixture, stir, cool, add lauryl alcohol polyoxyethylene ether carboxylate symmetrical succinic acid diester, stir at a constant temperature, and cool to room temperature to obtain the pretreated rubber powder; after heating the base asphalt, add the pretreated rubber powder step by step under strong stirring, and stir evenly to obtain the environmentally friendly low-smoke waste rubber powder asphalt.

[0016] As a preferred embodiment, the heating temperature of the heavy aromatic oil is 115° C. to 125° C., and the temperature is kept constant for 1 h to 3 h after the rubber factory tar is added.

[0017] As a preferred embodiment, isocitral and diphenylpentanedionecarboxylate are added after cooling to 50°C to 70°C.

[0018] As a preferred embodiment, the waste rubber powder is heated to 95°C to 105°C.

[0019] As a preferred embodiment, the external admixture is added dropwise, and the resulting mixture is heated to 135°C to 145°C, stirred for 15min to 25min, cooled to 115°C to 125°C, and then lauryl alcohol polyoxyethylene ether carboxylate symmetrical succinic acid diester is added, stirred at a constant temperature for 25min to 35min, and cooled to room temperature to obtain the pretreated rubber powder.

[0020] As a preferred embodiment, after the base asphalt is heated to 150°C to 170°C, the pretreated rubber powder is added step by step under strong stirring, and the environmentally friendly low-smoke waste rubber powder asphalt is obtained after stirring for 55 minutes to 65 minutes.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. In order to solve the problems of high temperature, long preparation time, and harmful gases generated in the existing waste rubber powder asphalt preparation process causing pollution to the environment and harm to the health of production and construction personnel, the present invention solves the problem of waste rubber powder segregation by using an admixture composed of heavy aromatic oil, rubber factory tar, isocyclic citral and diphenylpentanedione carboxylate and pretreating the waste rubber powder with lauryl alcohol polyoxyethylene ether carboxylate symmetrical succinic acid diester, thereby inhibiting the volatilization and emission of harmful substances by light components, and improving the compatibility between waste rubber powder and matrix asphalt. As a result, the present invention can reduce the production temperature to 150°C to 170°C when finally preparing environmentally friendly low-smoke waste rubber powder asphalt, and the corresponding environmentally friendly low-smoke waste rubber powder asphalt can be obtained without high-temperature development for several hours, which has the advantages of low production temperature and short time, while reducing the emission of harmful gases such as hydrogen sulfide, sulfur dioxide and organic amines, protecting the environment and personnel health, and saving energy and protecting the environment.

[0023] 2. In order to solve the problem that the undissolved waste rubber powder particles will clog the equipment nozzle during the spraying construction of the existing asphalt products containing waste rubber powder particles, resulting in the inability to carry out the construction normally, the present invention effectively solves the segregation of waste rubber powder by using an admixture and pre-treating the waste rubber powder, wherein the groups in the admixture cross-link with the carbon-carbon double bonds in the waste rubber powder and react chemically with the matrix asphalt to form a three-dimensional network structure, and the waste rubber powder particles are no longer suspended in the asphalt, preventing the segregation of waste rubber powder, thereby improving the thermal storage stability of environmentally friendly low-smoke waste rubber powder asphalt. In addition, the pretreatment promotes the breaking of the S bond in the waste rubber powder, so that it can better undergo a cross-linking reaction with the matrix asphalt, further solving the segregation problem of waste rubber powder and improving the performance of environmentally friendly low-smoke waste rubber powder asphalt.

[0024] 3. Compared with the prior art, the environmentally friendly low-smoke waste rubber powder asphalt prepared by the present invention has greatly improved high and low temperature performance, can greatly adapt to market demand, and has broad application prospects. DETAILED DESCRIPTION

[0025] The environmentally friendly low-smoke waste rubber powder asphalt of the present invention consists of the following components in parts by weight: 0.1 to 0.5 parts by weight of heavy aromatic oil; 0.05 to 0.15 parts by weight of rubber factory tar; 0.05 to 0.1 parts by weight of isocyclic citral; 0.03 to 0.05 parts by weight of diphenyl pentanedione carboxylate; 0.2 to 0.4 parts by weight of symmetrical succinic acid diester of lauryl alcohol polyoxyethylene ether carboxylate; 15 to 30 parts by weight of waste rubber powder; and 100 parts by weight of base asphalt.

[0026] The waste rubber powder may specifically be waste truck tire rubber powder, waste shoe sole rubber powder, etc., but is not limited thereto.

[0027] Among them, rubber factory tar comes from rubber factory waste. It is a black solid substance, and its main components are hydrocarbons and aromatic compounds. Diphenylpentanedione carboxylate is a commercially available chemical. Among them, lauryl alcohol polyoxyethylene ether carboxylate symmetrical succinic acid diester is a commercially available chemical, or, it can be synthesized by the following synthesis method: lauryl alcohol polyoxyethylene ether carboxylate is transferred into a reaction kettle, catalyst CeY is added, stirring is started and the temperature is raised to 55-65°C, succinic acid diester is added, and after reacting for 20 minutes, the temperature is raised to 115°C, catalyst CeY is added, and the temperature is continuously controlled at 115-120°C, and lauryl alcohol polyoxyethylene ether carboxylate symmetrical succinic acid diester is obtained in 20 minutes.

[0028] In addition, the role and function of each component in the formula are as follows:

[0029] Among them, the specific role of heavy aromatic oil in the formula is to adjust the overall viscosity and improve the compatibility of each component.

[0030] Among them, the specific role of rubber factory tar in the formula is: rubber factory tar and other additives can cooperate with each other to improve the compatibility between waste rubber powder and matrix asphalt, and at the same time cooperate with other additives to improve the performance of environmentally friendly low-smoke waste rubber powder asphalt, so that the environmentally friendly low-smoke waste rubber powder asphalt prepared by the present invention has improved high and low temperature performance compared with ordinary rubber modified asphalt.

[0031] Among them, the specific role of isocyclic citral in the formula is: to coordinate with rubber factory tar to adjust the structure of waste rubber powder, so as to lock the harmful light components in waste rubber powder and matrix asphalt, prevent them from volatilizing into the air, reduce flue gas emissions, and achieve environmental protection effects.

[0032] Among them, the specific role of diphenylpentanedione carboxylate in the formula is: synergistically with isocyclic citral and other substances to adjust the structure and performance of waste rubber powder, which can further promote the breaking of the S bonds in the waste rubber powder, making the waste rubber powder easy to disperse and reducing the difficulty of producing environmentally friendly low-smoke waste rubber powder asphalt.

[0033] Among them, the specific role of lauryl alcohol polyoxyethylene ether carboxylate symmetrical succinic acid diester in the formula is: it can not only cross-link with the carbon-carbon double bonds in the waste rubber powder, but also react chemically with the matrix asphalt to form a three-dimensional network structure, making the waste rubber powder and the matrix asphalt a whole, effectively preventing the stratification and segregation problem caused by poor interface bonding between the waste rubber powder and the matrix asphalt, so that the prepared environmentally friendly low-smoke waste rubber powder asphalt has long-term thermal storage stability.

[0034] The method for preparing environmentally friendly low-smoke waste rubber powder asphalt of the present invention specifically comprises the following steps:

[0035] (1) After heating the heavy aromatic oil to 115°C to 125°C, add the rubber factory tar, keep the temperature constant for 1h to 3h, cool to 50°C to 70°C, add isocyclocitral and diphenylpentanedione carboxylate, and stir evenly to obtain the admixture. Among them, the groups in the obtained admixture are cross-linked with the carbon-carbon double bonds in the waste rubber powder on the one hand, and react chemically with the matrix asphalt on the other hand, thereby forming a three-dimensional network structure, thereby making the waste rubber powder and the matrix asphalt become a whole, and the waste rubber powder particles are no longer suspended in the asphalt, which effectively prevents the segregation of waste rubber powder and improves the thermal storage stability of environmentally friendly low-smoke waste rubber powder asphalt.

[0036] (2) After heating the waste rubber powder to 95°C to 105°C, the admixture is slowly added dropwise thereto, and the resulting mixture is heated to 135°C to 145°C, stirred for 15min to 25min, cooled to 115°C to 125°C, and then lauryl alcohol polyoxyethylene ether carboxylate symmetrical succinic acid diester is added, stirred at a constant temperature for 25min to 35min, and cooled to room temperature to obtain the pretreated rubber powder. Among them, after being pretreated with lauryl alcohol polyoxyethylene ether carboxylate symmetrical succinic acid diester, the S bond of the waste rubber powder can be effectively broken, its solubility can be increased, and it can better react with the matrix asphalt to crosslink, further preventing the segregation of the waste rubber powder, and improving the performance of the environmentally friendly low-smoke waste rubber powder asphalt. At the same time, the pretreatment operation improves the solubility of the waste rubber powder, so that the environmentally friendly low-smoke waste rubber powder asphalt containing waste rubber powder particles will not clog the equipment nozzle during construction, which speeds up the construction progress and facilitates the construction personnel to carry out construction operations.

[0037] (3) After heating the base asphalt to 150°C to 170°C, the pretreated rubber powder is added step by step under strong stirring, and the environmentally friendly low-smoke waste rubber powder asphalt is obtained after stirring for 55 minutes to 65 minutes.

[0038] Since the operations of step (1) and step (2) solve the problem of separation of waste rubber powder, and improve the compatibility between waste rubber powder and matrix asphalt, and through industrial tests, it is found that the time to reach the highest torque in industrial production is significantly shortened, which is only 1 / 4 to 1 / 3 of that without adding admixtures, and the energy saving and emission reduction effect is obvious. Therefore, when implementing step (3), the reaction temperature of the present invention can be set at 150°C to 170°C, which is lower than the existing production temperature. The present invention does not require a high production temperature to achieve the preparation of environmentally friendly low-smoke waste rubber powder asphalt, reduces the production temperature, shortens the production time, and can significantly reduce the large-scale emission of harmful gases such as hydrogen sulfide, sulfur dioxide and organic amines, thereby achieving the effect of saving energy and reducing environmental pollution, and avoiding the influence of overheating aging on the performance of environmentally friendly low-smoke waste rubber powder asphalt.

[0039] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0040] Example 1 Environmentally friendly low-smoke waste rubber powder asphalt and preparation method thereof

[0041] The environmentally friendly low-smoke waste rubber powder asphalt of this embodiment is composed of the following components in parts by weight: 0.1 parts of heavy aromatic oil; 0.05 parts of rubber factory tar; 0.05 parts of isocyclic citral; 0.03 parts of diphenyl pentanedione carboxylate; 0.2 parts of lauryl alcohol polyoxyethylene ether carboxylate symmetrical succinic acid diester; 15 parts of waste rubber powder; and 100 parts of base asphalt.

[0042] The specific preparation process is as follows:

[0043] (1) preparing an admixture;

[0044] Heat 0.1 parts of heavy aromatic oil to 120°C, add 0.05 parts of rubber factory tar, keep the temperature constant for 2 hours, then cool to 60°C, add 0.05 parts of isocyclocitral and 0.03 parts of diphenylpentanedione carboxylate, and stir for 30 minutes to obtain the rubber powder asphalt admixture.

[0045] (2) Pretreatment of waste rubber powder;

[0046] a. Weigh 15 parts of waste rubber powder and place them in a container; wherein the waste rubber powder is waste truck tire rubber powder;

[0047] b. Heat the waste rubber powder in the oil bath heating device while stirring until the waste rubber powder is heated to 100°C. The temperature of the waste rubber powder should be 100°C during the temperature test, not the oil bath temperature;

[0048] c. When the waste rubber powder is heated to 100°C, start to increase the stirring speed and add the rubber powder asphalt admixture at the same time. It should be noted that the rubber powder asphalt admixture must be added drop by drop and slowly. During the process of adding the rubber powder asphalt admixture, it can be observed that the waste rubber powder gradually thickens. The slower the thickening speed, the more uniform the addition of the rubber powder asphalt admixture.

[0049] d. After all the rubber powder asphalt admixtures have been added, the resulting mixture is immediately heated to 140°C and stirred for 20 minutes to allow it to fully react; then cooled to 120°C and 0.2 parts of lauryl alcohol polyoxyethylene ether carboxylate symmetrical succinic acid diester are added and stirred at a constant temperature for 30 minutes;

[0050] e. Then start cooling to room temperature. The pretreated waste rubber powder is stored at room temperature and protected from light. If the decomposition of the rubber powder asphalt admixture is complete, the waste rubber powder will no longer be sticky.

[0051] (3) Preparation of environmentally friendly low-smoke waste rubber powder asphalt;

[0052] a. Weigh 100 parts of base asphalt, heat to 168°C, start strong stirring, and slowly add the pretreated waste rubber powder in steps.

[0053] b. Continue stirring at 168°C for 60 minutes to allow it to fully react and obtain environmentally friendly low-smoke waste rubber powder asphalt.

[0054] Example 2 Environmentally friendly low-smoke waste rubber powder asphalt and preparation method thereof

[0055] The environmentally friendly low-smoke waste rubber powder asphalt of this embodiment is composed of the following components by weight: 0.5 parts of heavy aromatic oil; 0.15 parts of rubber factory tar; 0.1 parts of isocyclic citral; 0.05 parts of diphenyl pentanedione carboxylate; 0.4 parts of lauryl alcohol polyoxyethylene ether carboxylate symmetrical succinic acid diester; 30 parts of waste rubber powder; and 100 parts of base asphalt.

[0056] The specific preparation process is as follows:

[0057] (1) preparing an admixture;

[0058] Heat 0.5 parts of heavy aromatic oil to 120°C, add 0.15 parts of rubber factory tar, keep the temperature constant for 2 hours and then cool to 60°C, add 0.1 parts of isocyclic citral and 0.05 parts of diphenylpentanedione carboxylate, and stir for 30 minutes to obtain the rubber powder asphalt admixture.

[0059] (2) Pretreatment of waste rubber powder;

[0060] a. Weigh 30 parts of waste rubber powder and place them in a container; wherein the waste rubber powder is waste truck tire rubber powder;

[0061] b. Heat the waste rubber powder in the oil bath heating device while stirring until the waste rubber powder is heated to 100°C. The temperature of the waste rubber powder should be 100°C during the temperature test, not the oil bath temperature;

[0062] c. When the waste rubber powder is heated to 100°C, start to increase the stirring speed and add the rubber powder asphalt admixture at the same time. It should be noted that the rubber powder asphalt admixture must be added drop by drop and slowly. During the process of adding the rubber powder asphalt admixture, it can be observed that the waste rubber powder gradually thickens. The slower the thickening speed, the more uniform the addition of the rubber powder asphalt admixture.

[0063] d. After all the rubber powder asphalt admixtures have been added, the resulting mixture is immediately heated to 140°C and stirred for 20 minutes to allow it to fully react; then cooled to 120°C and 0.4 parts of lauryl alcohol polyoxyethylene ether carboxylate symmetrical succinic acid diester are added and stirred at a constant temperature for 30 minutes;

[0064] e. Then start cooling to room temperature. The pretreated waste rubber powder is stored at room temperature and protected from light. If the decomposition of the rubber powder asphalt admixture is complete, the waste rubber powder will no longer be sticky.

[0065] (3) Preparation of environmentally friendly low-smoke waste rubber powder asphalt;

[0066] a. Weigh 100 parts of base asphalt, heat to 168°C, start strong stirring, and slowly add the pretreated waste rubber powder in steps.

[0067] b. Continue stirring at 168°C for 60 minutes to allow it to fully react and obtain environmentally friendly low-smoke waste rubber powder asphalt.

[0068] Example 3 Environmentally friendly low-smoke waste rubber powder asphalt and preparation method thereof

[0069] The environmentally friendly low-smoke waste rubber powder asphalt of this embodiment is composed of the following components by weight: 0.3 parts of heavy aromatic oil; 0.1 parts of rubber factory tar; 0.075 parts of isocyclic citral; 0.04 parts of diphenyl pentanedione carboxylate; 0.3 parts of lauryl alcohol polyoxyethylene ether carboxylate symmetrical succinic acid diester; 22.5 parts of waste rubber powder; and 100 parts of base asphalt.

[0070] The specific preparation process is as follows:

[0071] (1) preparing an admixture;

[0072] Heat 0.3 parts of heavy aromatic oil to 120°C, add 0.1 parts of rubber factory tar, keep the temperature constant for 2 hours, then cool to 60°C, add 0.075 parts of isocyclocitral and 0.04 parts of diphenylpentanedione carboxylate, and stir for 30 minutes to obtain the rubber powder asphalt admixture.

[0073] (2) Pretreatment of waste rubber powder;

[0074] a. Weigh 22.5 parts of waste rubber powder and place it in a container; wherein the waste rubber powder is waste truck tire rubber powder;

[0075] b. Heat the waste rubber powder in the oil bath heating device while stirring until the waste rubber powder is heated to 100°C. The temperature of the waste rubber powder should be 100°C during the temperature test, not the oil bath temperature;

[0076] c. When the waste rubber powder is heated to 100°C, start to increase the stirring speed and add the rubber powder asphalt admixture at the same time. It should be noted that the rubber powder asphalt admixture must be added drop by drop and slowly. During the process of adding the rubber powder asphalt admixture, it can be observed that the waste rubber powder gradually thickens. The slower the thickening speed, the more uniform the addition of the rubber powder asphalt admixture.

[0077] d. After all the rubber powder asphalt admixtures have been added, the resulting mixture is immediately heated to 140°C and stirred for 20 minutes to allow it to react fully; then cooled to 120°C and 0.3 parts of lauryl alcohol polyoxyethylene ether carboxylate symmetrical succinic acid diester are added and stirred at a constant temperature for 30 minutes;

[0078] e. Then start cooling to room temperature. The pretreated waste rubber powder is stored at room temperature and protected from light. If the decomposition of the rubber powder asphalt admixture is complete, the waste rubber powder will no longer be sticky.

[0079] (3) Preparation of environmentally friendly low-smoke waste rubber powder asphalt;

[0080] a. Weigh 100 parts of base asphalt, heat to 168°C, start strong stirring, and slowly add the pretreated waste rubber powder in steps.

[0081] b. Continue stirring at 168°C for 60 minutes to allow it to fully react and obtain environmentally friendly low-smoke waste rubber powder asphalt.

[0082] Comparative Example 1 Preparation of Waste Rubber Powder Asphalt

[0083] The preparation process is the same as that in Example 1, except that: in Comparative Example 1, rubber factory tar, isocyclic citral and diphenylpentanedione carboxylate are not added, and the other steps are the same as in Example 1.

[0084] Comparative Example 2 Preparation of Waste Rubber Powder Asphalt

[0085] The preparation process is the same as that in Example 1, except that: in Comparative Example 2, no lauryl alcohol polyoxyethylene ether carboxylate symmetrical succinic acid diester is added, and the other steps are the same as those in Example 1.

[0086] Comparative Example 3 Preparation of Waste Rubber Powder Asphalt

[0087] The components of the admixture prepared in step (1) of Example 1 (0.1 parts of heavy aromatic oil, 0.05 parts of rubber factory tar, 0.05 parts of isocyclic citral and 0.03 parts of diphenylpentanedione carboxylate) were directly added to the waste rubber powder, and 0.2 parts of lauryl alcohol polyoxyethylene ether carboxylate symmetrical succinic acid diester were added at the same time. The mixture was stirred for 50 minutes at 140°C to obtain the pretreated waste rubber powder; then, the waste rubber powder asphalt was prepared according to step (3) of Example 1.

[0088] Comparative Example 4 Preparation of Waste Rubber Powder Asphalt

[0089] 0.1 parts of heavy aromatic oil, 0.05 parts of rubber factory tar, 0.05 parts of isocyclic citral, 0.03 parts of diphenylpentanedione carboxylate, 0.2 parts of lauryl alcohol polyoxyethylene ether carboxylate symmetrical succinic acid diester, and 15 parts of waste rubber powder are added to 100 parts of asphalt and stirred at 168°C for 60 minutes.

[0090] Directly add 0.1 parts of heavy aromatic oil, 0.05 parts of rubber factory tar, 0.05 parts of isocyclic citral, 0.03 parts of diphenylpentanedione carboxylate, 0.2 parts of lauryl alcohol polyoxyethylene ether carboxylate symmetrical succinic acid diester and 15 parts of waste rubber powder into 100 parts of base asphalt, and stir at 168°C for 60 minutes to obtain waste rubber powder asphalt.

[0091] The softening point, emission reduction, and separation softening point difference of the waste rubber powder asphalt prepared in the above Examples 1-3 and Comparative Examples 1-4 were tested according to existing testing methods. The test results are shown in Table 1.

[0092] Table 1 Analysis results of waste rubber powder asphalt performance

[0093] Serial number Softening point / ℃ Emission reduction / % Segregation softening point difference / ℃ Example 1 58 56 2.6 Example 2 60 65 1.3 Example 3 63 60 1.8 Comparative Example 1 52 22 9.8 Comparative Example 2 55 39 9.3 Comparative Example 3 56 48 6.5 Comparative Example 4 52 10 10.2

[0094] As can be seen from Table 1, in Comparative Example 1, when only heavy aromatic oil was added, the softening point was 52°C, the emission reduction was 22%, and the separation softening point difference was 9.8°C; in Comparative Example 2, when no surfactant (lauryl alcohol polyoxyethylene ether carboxylate symmetrical succinic acid diester) was added, the softening point was 55°C, the emission reduction was 39%, and the separation softening point difference was 9.3°C; in Comparative Example 3, when a waste rubber powder pretreatment method different from that of Example 1 was adopted, the softening point was 56°C, the emission reduction was 48%, and the separation softening point difference was 6.5°C; in Comparative Example 4, when the waste rubber powder was not pretreated, the softening point was 52°C, the emission reduction was 10%, and the separation softening point difference was 10.2°C. In the present invention, the softening point of Example 1 is 58°C, the emission reduction is 56%, and the separation softening point difference is 2.6°C; the softening point of Example 2 is 60°C, the emission reduction is 65%, and the separation softening point difference is 1.3°C; the softening point of Example 3 is 63°C, the emission reduction is 60%, and the separation softening point difference is 1.8°C. From the above data, it can be seen that the environmentally friendly low-smoke waste rubber powder asphalt prepared by the present invention has a softening point of 58°C-63°C, an emission reduction of 56%-65%, and a separation softening point difference of 1.3°C-2.6°C. The present invention improves the softening point and emission reduction of environmentally friendly low-smoke waste rubber powder asphalt, reduces the separation softening point difference, improves the comprehensive performance index of environmentally friendly low-smoke waste rubber powder asphalt, reduces the emission of harmful gases in the production process, and achieves the effects of energy saving, emission reduction, and environmental pollution reduction.

[0095] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. Environmentally friendly low-smoke waste rubber powder asphalt, characterized by: It is composed of the following components in parts by weight: 0.1 to 0.5 parts by weight of heavy aromatic oil; 0.05 to 0.15 parts by weight of rubber factory tar; 0.05 to 0.1 parts by weight of isocyclic citral; 0.03 to 0.05 parts by weight of diphenylpentanedione carboxylate; 0.2 to 0.4 parts by weight of symmetrical succinic acid diester of lauryl alcohol polyoxyethylene ether carboxylate; 15 to 30 parts by weight of waste rubber powder; 100 parts by weight of base asphalt.

2. The method for preparing environmentally friendly low-smoke waste rubber powder asphalt according to claim 1, characterized in that: The following steps are involved: After heating the heavy aromatic oil, add the rubber factory tar, keep the temperature constant, add isocyclic citral and diphenylpentanedione carboxylate after cooling, and stir evenly to obtain the admixture; after heating the waste rubber powder, add the admixture dropwise, heat the resulting mixture, stir, cool, add lauryl alcohol polyoxyethylene ether carboxylate symmetrical succinic acid diester, stir at a constant temperature, and cool to room temperature to obtain the pretreated rubber powder; after heating the base asphalt, add the pretreated rubber powder step by step under strong stirring, and stir evenly to obtain the environmentally friendly low-smoke waste rubber powder asphalt.

3. The method for preparing environmentally friendly low-smoke waste rubber powder asphalt according to claim 2, characterized in that: The heating temperature of the heavy aromatic oil is 115° C. to 125° C., and the temperature is kept constant for 1 hour to 3 hours after the rubber factory tar is added.

4. The method for preparing environmentally friendly low-smoke waste rubber powder asphalt according to claim 2, characterized in that: After cooling to 50°C to 70°C, add isocyclic citral and diphenylpentanedione carboxylate.

5. The method for preparing environmentally friendly low-smoke waste rubber powder asphalt according to claim 2, characterized in that: Heat the waste rubber powder to 95℃~105℃.

6. The method for preparing environmentally friendly low-smoke waste rubber powder asphalt according to claim 2, characterized in that: Add the external admixture dropwise, heat the mixture to 135°C-145°C, stir for 15-25 minutes, cool to 115-125°C, add lauryl alcohol polyoxyethylene ether carboxylate symmetrical succinic acid diester, stir at a constant temperature for 25-35 minutes, and cool to room temperature to obtain the pretreated rubber powder.

7. The method for preparing environmentally friendly low-smoke waste rubber powder asphalt according to claim 2, characterized in that: After heating the base asphalt to 150°C to 170°C, add the pretreated rubber powder step by step under strong stirring, and stir for 55min to 65min to obtain the environmentally friendly low-smoke waste rubber powder asphalt.