Rubber powder asphalt admixture as well as preparation method and use method thereof

Abstract

The invention discloses a rubber powder asphalt admixture and a preparation method and a use method thereof, and relates to the field of petroleum asphalt modification, the rubber powder asphalt admixture comprises the following components by weight: 10-20 parts of heavy aromatic oil, 12-24 parts of rubber factory tar, 4-12 parts of polysulfide benzene, and 8-16 parts of 1, 4-butanediol amber disulfonate. The prepared rubber powder asphalt admixture can increase the compatibility between the rubber powder in the rubber powder asphalt and the matrix asphalt, so that no obvious particulate matter exists in the rubber powder asphalt, and the problem that the blending type stabilizer is mutually gathered in the long-term storage process so as to be separated from the matrix asphalt is fundamentally solved; the production cost of the rubber powder asphalt is reduced, and the problems that an existing chemical reaction type stabilizer is high in price, difficult to popularize and use and the like are solved; the solubility of the rubber powder in the matrix asphalt is improved, the segregation and aging phenomena are reduced, and the performance of the prepared rubber powder asphalt is improved.

Description

Technical Field

[0001] The invention relates to the technical field of petroleum asphalt modification, and in particular to a rubber powder asphalt admixture and a preparation method and a use method thereof. Background Art

[0002] The initial purpose of studying rubber asphalt was to solve the problem of dealing with a large number of waste tires. However, with the deepening of research and the promotion of application, it was found that rubber asphalt not only has road performance comparable to SBS modified asphalt, but also has good performance, social benefits and economic benefits. At present, the main factor restricting the further promotion and application of rubber asphalt is its poor storage stability. Since the rubber powder polymer has a relatively large density, it will slowly settle and separate during high-temperature static storage. Ordinary rubber asphalt needs to be used immediately after production, and it is very easy to settle during long-term storage and transportation, which greatly restricts the promotion and application of rubber asphalt. Summary of the invention

[0003] The purpose of the present invention is to provide a rubber powder asphalt admixture and a preparation method and a use method thereof, so as to solve the problems existing in the existing rubber asphalt.

[0004] The technical solution adopted by the present invention to solve the technical problem is as follows:

[0005] The rubber powder asphalt admixture of the present invention is composed of the following components in parts by weight:

[0006] 10-20 parts of heavy aromatic oil, 12-24 parts of rubber factory tar, 4-12 parts of polyphenyl sulfide, 8-16 parts of 1,4-butanediol succinate disulfonate.

[0007] Preferably, the 1,4-butanediol succinic diester disulfonate is sodium 1,4-butanediol succinic diester disulfonate or potassium 1,4-butanediol succinic diester disulfonate.

[0008] A method for preparing a rubber powder asphalt admixture of the present invention comprises the following steps:

[0009] Heat 10-20 parts of heavy aromatic oil to 100-140°C, add 12-24 parts of rubber factory tar, keep the temperature constant for 1-3 hours, then add 4-12 parts of polyphenyl sulfide, stir for 10-30 minutes, cool to 50-70°C, finally add 8-16 parts of 1,4-butanediol succinate diester disulfonate, stir for 20-40 minutes, and obtain the product after cooling.

[0010] A method for using a rubber powder asphalt admixture of the present invention comprises the following steps:

[0011] First, heat the waste rubber powder to 95-105°C, then add the rubber powder asphalt admixture, stirring while adding, until all the rubber powder asphalt admixture is added and the waste rubber powder becomes thick, and finally heat the resulting mixture to 135-145°C, stir, and cool to room temperature to obtain the modified waste rubber powder.

[0012] Preferably, the rubber powder asphalt admixture accounts for 2.0-3.0wt% in the waste rubber powder.

[0013] Preferably, the method further comprises the following steps: slowly adding the obtained modified waste rubber powder into the base asphalt at 155-175° C., stirring vigorously while adding, and stirring continuously at a constant temperature for 55-65 minutes to obtain rubber asphalt.

[0014] Preferably, the mass ratio of the modified scrap rubber powder to the base asphalt is (1:4)-(2:3).

[0015] The beneficial effects of the present invention are:

[0016] In view of the problems existing in the prior art, the present invention provides a rubber powder asphalt admixture and a preparation method thereof, wherein the prepared rubber powder asphalt admixture can increase the compatibility between the rubber powder in the rubber powder asphalt and the base asphalt, so that there are no obvious particulates in the rubber powder asphalt, fundamentally solving the problem of the mutual aggregation of the blending stabilizer and the separation from the base asphalt during long-term storage, thereby improving the performance of the prepared rubber powder asphalt.

[0017] In addition, the prepared rubber powder asphalt admixture has the following effects when used:

[0018] 1. Cross-linking-polymerization;

[0019] When producing rubber powder asphalt, adding the rubber powder asphalt admixture of the present invention can promote cross-linking of polymers in the rubber powder asphalt, increase the molecular weight of the polymer and thus reduce the amount of polymer used, thereby reducing the production cost of the rubber powder asphalt, solving the problems of existing chemical reaction stabilizers such as high price and difficulty in popularization and use.

[0020] 2. De-crosslinking-depolymerization;

[0021] When producing rubber powder asphalt, adding the rubber powder asphalt admixture of the present invention can promote the rubber powder to break the S bonds therein, improve the solubility of the rubber powder in the matrix asphalt, reduce segregation and aging phenomena, and the rubber powder asphalt prepared using the rubber powder asphalt admixture of the present invention has obvious performance improvements compared to ordinary rubber asphalt. DETAILED DESCRIPTION

[0022] The present invention provides a rubber powder asphalt admixture, which is mainly composed of the following components in parts by weight:

[0023] 10-20 parts of heavy aromatic oil, 12-24 parts of rubber factory tar, 4-12 parts of polyphenyl sulfide, 8-16 parts of 1,4-butanediol succinate disulfonate.

[0024] Preferably, the 1,4-butanediol succinic diester disulfonate is sodium 1,4-butanediol succinic diester disulfonate or potassium 1,4-butanediol succinic diester disulfonate, but is not limited thereto.

[0025] The present invention provides a method for preparing a rubber powder asphalt admixture, which mainly comprises the following steps:

[0026] Heat 10-20 parts of heavy aromatic oil to 100-140°C, add 12-24 parts of rubber factory tar, keep the temperature constant for 1-3 hours, then add 4-12 parts of polyphenyl sulfide, stir for 10-30 minutes, cool to 50-70°C, finally add 8-16 parts of 1,4-butanediol succinate diester disulfonate, stir for 20-40 minutes, and obtain the product after cooling.

[0027] The present invention provides a method for using a rubber powder asphalt admixture, comprising the following steps:

[0028] First, heat the waste rubber powder to 95-105℃, then add the rubber powder asphalt admixture dropwise, stirring while adding, until all the rubber powder asphalt admixture is added and the waste rubber powder becomes thick, and finally heat the resulting mixture to 135-145℃, stir, and cool to room temperature to obtain the modified waste rubber powder; slowly add the obtained modified waste rubber powder into the base asphalt at 155-175℃, start strong stirring while adding, and continue stirring at a constant temperature for 55-65 minutes to obtain rubber asphalt.

[0029] Preferably, the proportion of the rubber powder asphalt admixture in the waste rubber powder is 2.0-3.0wt%.

[0030] Preferably, the mass ratio of modified waste rubber powder to base asphalt is: (1:4)-(2:3).

[0031] Among them, rubber factory tar is the waste material from the rubber factory, a black solid substance, whose main components are hydrocarbons and aromatic compounds.

[0032] In addition, in the present invention, the role and function of each component in the formulation are as follows:

[0033] The role and function of heavy aromatic oil are to adjust the overall viscosity and improve the compatibility of each component.

[0034] The role and function of rubber factory tar are as follows: rubber factory tar and other additives can cooperate with each other to improve the compatibility between modified waste rubber powder and matrix asphalt, and at the same time cooperate with other additives to improve the performance of rubber asphalt, so that the rubber asphalt prepared by the present invention has improved high and low temperature performance compared with ordinary rubber modified asphalt.

[0035] The role and function of polyphenyl sulfide are: to cooperate with other components to adjust the structure and performance of the modified waste rubber powder, further promote the breaking of the S bonds in the modified waste rubber powder, make the modified waste rubber powder easy to disperse, and reduce the difficulty of rubber asphalt production.

[0036] The role and function of 1,4-butanediol succinate disulfonate are: to make the modified waste rubber powder and the matrix asphalt become a whole, promote the cross-linking of the polymer therein, increase the molecular weight of the polymer and thus reduce the amount of polymer used, thereby reducing the production cost of rubber asphalt, solving the problem of the existing chemical reaction stabilizers being expensive and difficult to promote and use.

[0037] 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.

[0038] Example 1 Rubber powder asphalt admixture and its preparation method and use method

[0039] The preparation process of the rubber powder asphalt admixture of this embodiment is as follows:

[0040] Heat 20 parts of heavy aromatic oil to 120°C, add 24 parts of rubber factory tar, keep the temperature constant for 2 hours, then add 12 parts of polyphenyl sulfide, stir for 20 minutes, cool to 60°C, finally add 16 parts of 1,4-butanediol succinate sodium disulfonate and stir for 30 minutes. After cooling, the rubber powder asphalt admixture is obtained.

[0041] The use process of the rubber powder asphalt admixture obtained in this embodiment is as follows:

[0042] First, heat the waste rubber powder to 100°C, then slowly drip the prepared rubber powder asphalt admixture, stirring while dripping, until all the rubber powder asphalt admixtures are dripped to obtain a mixture, wherein the proportion of rubber powder asphalt admixtures in the waste rubber powder is 2.5wt%; in the process of dripping the rubber powder asphalt admixture, it can be observed that the waste rubber powder slowly thickens, and the slower the thickening speed, the more uniform the addition of the rubber powder asphalt admixture; finally, heat the obtained mixture to 140°C, stir for 20 minutes, and then cool to room temperature to obtain the modified waste rubber powder. The modified waste rubber powder should be stored at room temperature and avoid light. Slowly add the modified waste rubber powder obtained above to the matrix asphalt at 167°C (the mass ratio of modified waste rubber powder to matrix asphalt is 1:4), start strong stirring while adding, and continue stirring at 168°C for 60 minutes to make it fully react to obtain rubber asphalt. The softening point, elongation, 177°C viscosity, 25°C elastic recovery and separation softening point difference of the rubber asphalt obtained in this example were tested according to existing testing technology. The performance test and analysis results are shown in Table 1.

[0043] Example 2 Rubber powder asphalt admixture and its preparation method and use method

[0044] The preparation process of the rubber powder asphalt admixture of this embodiment is as follows:

[0045] Heat 10 parts of heavy aromatic oil to 120°C, add 12 parts of rubber factory tar, keep the temperature constant for 2 hours, then add 4 parts of polyphenyl sulfide, stir for 20 minutes, cool to 60°C, finally add 8 parts of 1,4-butanediol succinate sodium disulfonate and stir for 30 minutes. After cooling, the rubber powder asphalt admixture is obtained.

[0046] The method of using the rubber powder asphalt admixture obtained in this example is the same as that in Example 1. The softening point, elongation, 177°C viscosity, 25°C elastic recovery and separation softening point difference of the rubber asphalt obtained in this example are tested according to existing testing technology. The performance test and analysis results are shown in Table 1.

[0047] Example 3 Rubber powder asphalt admixture and its preparation method and use method

[0048] The preparation process of the rubber powder asphalt admixture of this embodiment is as follows:

[0049] Heat 15 parts of heavy aromatic oil to 120°C, add 18 parts of rubber factory tar, keep the temperature constant for 2 hours, then add 8 parts of polyphenyl sulfide, stir for 20 minutes, cool to 60°C, finally add 12 parts of 1,4-butanediol succinate potassium disulfonate and stir for 30 minutes. After cooling, the rubber powder asphalt admixture is obtained.

[0050] The method of using the rubber powder asphalt admixture obtained in this example is the same as that in Example 1. The softening point, elongation, 177°C viscosity, 25°C elastic recovery and separation softening point difference of the rubber asphalt obtained in this example are tested according to existing testing technology. The performance test and analysis results are shown in Table 1.

[0051] Example 4 Rubber powder asphalt admixture and its preparation method and use method

[0052] The preparation process of the rubber powder asphalt admixture of this embodiment is as follows:

[0053] Heat 16 parts of heavy aromatic oil to 120°C, add 15 parts of rubber factory tar, keep the temperature constant for 2 hours, then add 6 parts of polyphenyl sulfide, stir for 20 minutes, cool to 60°C, finally add 10 parts of 1,4-butanediol succinate sodium disulfonate and stir for 30 minutes. After cooling, the rubber powder asphalt admixture is obtained.

[0054] The method of using the rubber powder asphalt admixture obtained in this example is the same as that in Example 1. The softening point, elongation, 177°C viscosity, 25°C elastic recovery and separation softening point difference of the rubber asphalt obtained in this example are tested according to existing testing technology. The performance test and analysis results are shown in Table 1.

[0055] Comparative Example 1

[0056] The base asphalt was placed in an oven and heated to 180°C, and waste rubber powder was added at a mass ratio of 1:4 to the base asphalt. After mixing at 180°C for 10 minutes, it was continued to be placed in an oven at 180°C for high temperature swelling for 1 hour. Finally, the rubber asphalt was sheared at 180°C and 5000 rpm for 30 minutes. After high temperature development for 3 hours, the recycled rubber powder modified asphalt was obtained. The softening point, elongation, 177°C viscosity, 25°C elastic recovery and separation softening point difference of the recycled rubber powder modified asphalt obtained in this embodiment were tested according to existing testing technology. The performance test and analysis results are shown in Table 1.

[0057] Comparative Example 2

[0058] On the basis of Example 1, rubber factory tar and 1,4-butanediol succinate diester disulfonate are not added, and the other components and admixtures are used in the same manner as in Example 1. The softening point, elongation, 177°C viscosity, 25°C elastic recovery, and separation softening point difference of the rubber asphalt obtained in this example are tested according to existing testing technology. The performance test and analysis results are shown in Table 1.

[0059] Comparative Example 3

[0060] The components in Example 1 (20 parts of heavy aromatic oil, 24 parts of rubber factory tar, 12 parts of polyphenyl sulfide and 16 parts of 1,4-butanediol succinate disulfonate potassium) were mixed and stirred in a molten state for 2 hours and 50 minutes, and then cooled to obtain an admixture. The use method of the admixture is the same as that in Example 1. The softening point, elongation, 177°C viscosity, 25°C elastic recovery and separation softening point difference of the rubber asphalt obtained in this example were tested according to existing testing technology. The performance test and analysis results are shown in Table 1.

[0061] Comparative Example 4

[0062] The components in Example 1 (20 parts of heavy aromatic oil, 24 parts of rubber factory tar, 12 parts of polybenzene sulfide and 16 parts of 1,4-butanediol succinate sodium disulfonate) were mixed and stirred in a molten state for 2 hours and 50 minutes, then added to waste rubber powder and matrix asphalt (the mass ratio of waste rubber powder to matrix asphalt was 1:4), and stirred at 168°C for 60 minutes to obtain rubber asphalt. The properties of the rubber asphalt obtained in this example were tested according to existing testing technology. The performance test and analysis results are shown in Table 1. The method of using the admixture is the same as that in Example 1. The softening point, elongation, 177°C viscosity, 25°C elastic recovery and separation softening point difference of the rubber asphalt obtained in this example were tested according to existing testing technology. The performance test and analysis results are shown in Table 1.

[0063] Blank example

[0064] The base asphalt was heated to 180°C, and waste rubber powder was added at a mass ratio of 1:4 to the base asphalt, and the mixture was heated to 220°C and stirred for 60 minutes to obtain rubber asphalt. The softening point, elongation, 177°C viscosity, 25°C elastic recovery, and separation softening point difference of the rubber asphalt obtained in this embodiment were tested using existing testing technology. The performance test and analysis results are shown in Table 1.

[0065] Table 1 Rubber powder asphalt performance analysis results

[0066]

[0067]

[0068] It can be seen from the data in Table 1 that the softening point of Examples 1-4 of the present invention is 68-72°C, the elongation at 5°C is 20-30cm, the viscosity at 177°C is 2.4-3.0Pa·s, the elastic recovery at 25°C is 77-88%, and the difference in separation softening point is 1.0-1.4°C. The performance of the rubber asphalt with admixture added in Examples 1-4 is better than the blank example without admixture added and the ordinary recycled rubber powder modified asphalt in Comparative Examples 1-4.

[0069] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in this field, corresponding changes and substitutions can be made according to the technical scheme and inventive concept of the present invention, and a rubber powder asphalt admixture with the same component formula as the present invention can be obtained, and its performance must be the same, which should be regarded as the protection scope of the present invention.

Claims

1. A rubber powder asphalt admixture, characterized in that: It is composed of the following components in parts by weight: 10-20 parts of heavy aromatic oil, 12-24 parts of rubber factory tar, 4-12 parts of polybenzene sulfide, 8-16 parts of 1,4-butanediol succinate diester disulfonate.

2. The rubber powder asphalt admixture according to claim 1, characterized in that: The 1,4-butanediol succinic diester disulfonate is sodium 1,4-butanediol succinic diester disulfonate or potassium 1,4-butanediol succinic diester disulfonate.

3. A method for preparing a rubber powder asphalt admixture as claimed in any one of claims 1 to 2, characterized in that: The method comprises the following steps: Heat 10-20 parts of heavy aromatic oil to 100-140°C, add 12-24 parts of rubber factory tar, keep the temperature constant for 1-3 hours, then add 4-12 parts of polyphenyl sulfide, stir for 10-30 minutes, cool to 50-70°C, finally add 8-16 parts of 1,4-butanediol succinate diester disulfonate, stir for 20-40 minutes, and obtain the product after cooling.

4. The method for using a rubber powder asphalt admixture as claimed in any one of claims 1 to 2, characterized in that: The method comprises the following steps: First, heat the waste rubber powder to 95-105°C, then add the rubber powder asphalt admixture, stirring while adding until all the rubber powder asphalt admixture has been added, and finally heat the resulting mixture to 135-145°C, stir, and cool to room temperature to obtain the modified waste rubber powder.

5. The method for using the rubber powder asphalt admixture according to claim 4, characterized in that: The rubber powder asphalt admixture accounts for 2.0-3.0wt% in the waste rubber powder.

6. The method for using the rubber powder asphalt admixture according to claim 4, characterized in that: The method also includes the following steps: slowly adding the obtained modified waste rubber powder into the base asphalt at 155-175° C., stirring vigorously while adding, and stirring continuously at a constant temperature for 55-65 minutes to obtain rubber asphalt.

7. The method for using the rubber powder asphalt admixture according to claim 6, characterized in that: The mass ratio of the modified waste rubber powder to the base asphalt is (1:4)-(2:3).

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