High-viscosity asphalt additive, preparation method and application thereof, and high-viscosity asphalt

Abstract

The invention belongs to the technical field of asphalt materials, and discloses a high-viscosity asphalt additive, a preparation method and application thereof, and high-viscosity asphalt. The high-viscosity asphalt additive is prepared from the following components in parts by mass: 30 to 50 parts of thermoplastic elastomer, 20 to 40 parts of toughening resin, 40 to 60 parts of alcohol solvent, 10 to 20 parts of polyethylene wax and 1 to 2 parts of polymerization inhibitor, the alcohol solvent is one or two of decanol and dodecanol; the alcohol solvent in the high-viscosity asphalt additive can well dissolve the thermoplastic elastomer and the toughening resin, so that the thermoplastic elastomer and the toughening resin are uniformly mixed, the softening point and the melting point of the mixture resin are reduced, and the additive has the characteristics of low melting point, rapid melting and stable performance; the modified asphalt can be modified by adding the modified asphalt modifier in the asphalt mixture mixing process; meanwhile, the comprehensive performance of the modified asphalt is remarkably improved by utilizing the synergistic interaction effect of all the components.

Description

Technical Field

[0001] The present invention belongs to the technical field of asphalt materials, and specifically relates to a high-viscosity asphalt additive, a preparation method thereof, uses thereof, and high-viscosity asphalt. Background Art

[0002] High-viscosity asphalt is currently widely used in scenarios such as ultra-thin overlays, drainage pavements, and bridge deck paving. With its increasingly widespread application, the demand for high-viscosity asphalt is also increasing. There are two mainstream technical routes for high-viscosity asphalt. One is the finished high-viscosity asphalt produced in the factory, which has high quality and stable and uniform performance, but requires a specific processing plant, and transportation from the processing plant to the construction site requires freight, etc., which increases cost expenditure. The second technical route is to use additives to add high-viscosity particles to the base asphalt of the mixing station or the ordinary modified asphalt storage tank, or directly put the high-viscosity particles into the mixing tank during the mixing process to complete the modification during the mixing process. Representative technical products are TPS high-viscosity particles used in Japan's drainage pavement and RST high-viscosity particles produced by Pudong Road and Bridge in China. The advantage of additives is that the process of modifying ordinary asphalt to high-viscosity asphalt no longer requires a factory, and extremely small demands or demands in remote areas can be easily met. It is only necessary to transport the additives and add them during the asphalt mixing process to complete the high-viscosity modification of the asphalt. However, there are some problems with ordinary high-viscosity particles. When added to modified asphalt, they can only meet the technical requirements of ordinary high-viscosity asphalt. They can be used for drainage pavement, but cannot be used for ultra-thin overlays and bridge deck paving.

[0003] In view of this, the problem that the present invention needs to solve is: how to prepare a high-viscosity asphalt additive, which is solid at room temperature and can be quickly melted when added to the asphalt mixing process to complete the modification. It can significantly improve the comprehensive performance of asphalt to meet the use requirements of ultra-thin overlays and bridge deck pavements. Summary of the Invention

[0004] The purpose of the present invention is to provide a high-viscosity asphalt additive, which includes a thermoplastic elastomer, a toughening resin, an alcohol solvent, a polyethylene wax and an inhibitor. The alcohol solvent can dissolve the thermoplastic elastomer and the toughening resin very well, so that they are mixed very evenly, thereby reducing the softening point and melting point of the mixture resin, so that the additive has the characteristics of low melting point, rapid melting and stable performance. The additive can be added during the asphalt mixing process to complete the modification of the asphalt; at the same time, the synergistic effect between the components is utilized to significantly increase the comprehensive performance of the modified asphalt.

[0005] At the same time, the present invention also provides a preparation method and use of the high-viscosity asphalt additive and high-viscosity asphalt containing the high-viscosity asphalt additive.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A high-viscosity asphalt additive comprises the following components, calculated by weight: 30-50 parts of a thermoplastic elastomer, 20-40 parts of a toughening resin, 40-60 parts of an alcohol solvent, 10-20 parts of a polyethylene wax, and 1-2 parts of a polymerization inhibitor.

[0008] The present invention has found that the softening point and melting point of the thermoplastic elastomer are relatively high, while the softening point and melting point of the toughening resin are relatively low. The thermoplastic elastomer and the toughening resin can be well dissolved by using an alcohol solvent. After the three components are evenly mixed, the softening point and melting point of the mixture resin can be significantly reduced, so that the additive can be added during the mixing process of the asphalt mixture. Only by using the temperature and mixing time during mixing, rapid melting can be achieved to complete the modification of the asphalt, which is different from traditional additives that need to be added during the asphalt production process to complete the modification. In addition, the alcohol solvent is selected from dodecyl alcohol or lauryl alcohol. Such solvents have the advantages of low melting point and high boiling point. The low melting point can further reduce the softening point and melting point of the additive, while the high boiling point can well reduce the volatilization of the solvent during the preparation process.

[0009] In addition, the high-viscosity asphalt additive of the present invention utilizes the synergistic effect between the various components to significantly increase the comprehensive performance of the modified asphalt.

[0010] Preferably, the thermoplastic elastomer is one or more combinations of SBS, SEBS, and SIS.

[0011] Preferably, the toughening resin is one or both of ethylene methyl acrylate copolymer EMA and ethylene ethyl acrylate copolymer EEA.

[0012] Preferably, the alcohol solvent is one or both of decanol and dodecanol.

[0013] Preferably, the polymerization inhibitor is p-tert-butylcatechol.

[0014] In addition, the present invention also discloses a method for preparing the high-viscosity asphalt additive as described above, which specifically comprises the following steps:

[0015] Step 1: Heat the alcohol solvent to 180-190°C, add the thermoplastic elastomer and stir for 30-40 minutes to completely dissolve it;

[0016] Step 2: Add toughening resin and polyethylene wax to the product of step 1, stir for 30-40 minutes, add polymerization inhibitor after the end, and cool naturally while stirring. Stop stirring when the temperature drops to 100°C, and continue to cool naturally to 50°C;

[0017] Step 3: The product of step 2 is extruded into spherical particles with a diameter of 2-3 mm through a pellet extruder to obtain a high-viscosity asphalt additive.

[0018] Preferably, the stirring speed in step 1 is 600-1000 r / min; the stirring speed in step 2 is also 600-1000 r / min.

[0019] In addition, the present invention also discloses the use of the high-viscosity asphalt additive as described above to prepare high-viscosity asphalt.

[0020] Finally, the present invention discloses a high-viscosity asphalt, which contains 9-15 wt% of the high-viscosity asphalt additive described above.

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

[0022] The high-viscosity asphalt additive prepared by the present invention no longer needs to be added during the asphalt production process like traditional asphalt additives, and can only be modified after a long period of stirring, shearing and other processes. It has the characteristics of low melting point and rapid melting. It only needs to be added during the mixing process of the asphalt mixture. The mixing temperature and time are used to complete the modification of the asphalt, significantly improving the performance of the asphalt, which is extremely convenient and efficient. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] Product Information

[0025] SBS1-D modified asphalt: SBS modified asphalt produced by Dongguan Taihe Asphalt Products Co., Ltd., China;

[0026] SBS: YH-791H produced by Sinopec Baling Petrochemical Company;

[0027] SEBS: TAIPOL 6152P produced by TSRC Taiwan Rubber Co., Ltd., China;

[0028] SIS: JH-8153 produced by Ningbo Jinhai Chenguang Chemical Co., Ltd., China, with a styrene content of 15 wt% and a diblock content of 20 wt%;

[0029] Ethylene methyl acrylate copolymer EMA: EMA produced by DuPont, USA, model 4170;

[0030] Ethylene ethyl acrylate copolymer EEA: EEA produced by Arkema, France, model 8200;

[0031] Decyl alcohol: China National Pharmaceutical Group McLean Chemical Reagent, n-decyl alcohol D806660;

[0032] Dodecanol: Dodecanol produced by Tianjin Huasheng Chemical Reagent Co., Ltd., China;

[0033] 4-tert-Butylcatechol: China National Pharmaceutical Group McLean Chemical Reagent, 4-tert-Butylcatechol B802140;

[0034] Polyethylene wax: China National Pharmaceutical Group McLean Reagent, polyethylene wax P903665.

[0035] Part 1

[0036] The following examples and comparative examples are prepared as follows:

[0037] Step 1: Heat the alcohol solvent to 185°C, add the thermoplastic elastomer and stir for 35 minutes at a stirring speed of 800 r / min to completely dissolve it;

[0038] Step 2: Add toughening resin and polyethylene wax to the product of step 1, stir for 35 minutes at a stirring speed of 800 r / min, add polymerization inhibitor after the end, and cool naturally while stirring at a stirring speed of 800 r / min. Stop stirring after the temperature drops to 100°C, and continue to cool naturally to 50°C;

[0039] Step 3: The product of step 2 is extruded into spherical particles with a diameter of 3 mm through a pellet extruder to obtain a high-viscosity asphalt additive.

[0040] The formula table of each embodiment and comparative example is shown in Table 1;

[0041] Table 1 Formula of high viscosity asphalt additives (parts by mass)

[0042]

[0043] Among them, the thermoplastic elastomer in Example 3 is SIS, the thermoplastic elastomer in Example 4 is SEBS, and the thermoplastic elastomers in the remaining examples and comparative examples are all SBS; the toughening resin in Example 5 is EEA, and the toughening resins in the remaining examples and comparative examples are all EMA; the alcohol solvent in Example 6 is dodecanol, and the alcohol solvents in the remaining examples and comparative examples are all decanol.

[0044] Example 7

[0045] The raw material composition is the same as that of Example 1, except that the preparation method is:

[0046] Step 1: Heat the alcohol solvent to 180°C, add the thermoplastic elastomer and stir for 30 minutes at a stirring speed of 1000 r / min to completely dissolve it;

[0047] Step 2: Add toughening resin and polyethylene wax to the product of step 1, stir for 30 minutes at a stirring speed of 1000 r / min, then add polymerization inhibitor, and cool naturally while stirring at a stirring speed of 1000 r / min. Stop stirring after the temperature drops to 100°C, and continue to cool naturally to 50°C;

[0048] Step 3: The product of step 2 is extruded into spherical particles with a diameter of 2 mm through a pellet extruder to obtain a high-viscosity asphalt additive.

[0049] Example 8

[0050] The raw material composition is the same as that of Example 1, except that the preparation method is:

[0051] Step 1: Heat the alcohol solvent to 190°C, add the thermoplastic elastomer and stir for 40 minutes at a stirring speed of 600 r / min to completely dissolve it;

[0052] Step 2: Add toughening resin and polyethylene wax to the product of step 1, stir for 40 minutes at a stirring speed of 600 r / min, add polymerization inhibitor after the end, and cool naturally while stirring at a stirring speed of 600 r / min. Stop stirring after the temperature drops to 100°C, and continue to cool naturally to 50°C;

[0053] Step 3: The product of step 2 is extruded into spherical particles with a diameter of 3 mm through a pellet extruder to obtain a high-viscosity asphalt additive.

[0054] Comparative Example 4

[0055] The process is substantially the same as Example 1, except that heptane is replaced with n-heptane.

[0056] Part 2

[0057] Application Example 1

[0058] The high-viscosity asphalt additives of each embodiment and comparative example were added to the SBS1-D modified asphalt in a ratio of 13:100. The addition process was as follows: the SBS1-D modified asphalt was heated to 185°C, and then the high-viscosity asphalt additive was added. The high-viscosity asphalt was tested at a speed of 600-1000 rpm after stirring for 5 minutes and 1 hour.

[0059] Among them, the high-viscosity asphalt additives corresponding to high-viscosity asphalts 1-8 are respectively the high-viscosity asphalt additives of Examples 1-8, and the high-viscosity asphalt additives corresponding to high-viscosity asphalts 9-12 are respectively the high-viscosity asphalt additives corresponding to Comparative Examples 1-4;

[0060] Performance testing

[0061] According to the specification "Testing Procedures for Asphalt and Asphalt Mixtures for Highway Engineering" JTGE20-2011, the obtained high viscosity asphalt 1-12 was tested, among which:

[0062] 5℃ elongation: T 0605-2011;

[0063] Softening point: T 0606-2011;

[0064] 60℃ dynamic viscosity: T 0620-2000;

[0065] PAV aging test method: T 0630-2011;

[0066] Elastic recovery: T 0662-2000;

[0067] The specific test data are shown in the table below;

[0068] Table 2 Test data of high viscosity asphalt after stirring for 5 minutes

[0069]

[0070] Table 3 Test data of high viscosity asphalt stirred for 1 hour

[0071]

[0072] Note: For dynamic viscosity test, the specification requires the upper limit of the test range to be 580,000. Results exceeding 580,000 can be calculated through experimental theory.

[0073] Analysis of the data in Table 2 shows that when the high-viscosity asphalt additives are stirred with ordinary asphalt for 5 minutes, the high-viscosity asphalt corresponding to the additives in Examples 1-8 has better performance, including an elongation of >45 cm at 5°C, a softening point >97°C, a dynamic viscosity at 60°C >800,000 Pa·s, and an elastic recovery rate >98%.

[0074] The modified asphalt obtained by stirring the comparative additive with ordinary asphalt for 5 minutes has an elongation of 31-37 cm at 5°C, a softening point of 85-91°C, a dynamic viscosity of 100,000-250,000 Pa·s at 60°C, and an elastic recovery rate of 92-94%.

[0075] In order to explore the modification effect of each high-viscosity asphalt additive on asphalt after complete melting, the additives were stirred with ordinary asphalt for another hour, and samples were taken again for testing. The results are shown in Table 3. Analysis of the data in Table 3 shows that after stirring for 1 hour, the various properties of high-viscosity asphalts 1-8 are almost the same; while the various properties of high-viscosity asphalts 9-12 have improved, especially the 60°C dynamic viscosity.

[0076] The above data show that the high-viscosity asphalt additive prepared in the embodiment of the present invention can complete the modification of asphalt in only 5 minutes during the mixing process with asphalt, indicating that it has the characteristics of low melting point and rapid melting; while the performance of the high-viscosity asphalt obtained by the additive in the comparative example is relatively low after stirring for 5 minutes, and is far lower than that of the embodiment, but after continuing to stir for 1 hour, the performance of the high-viscosity asphalt obtained is improved, indicating that it takes a long time to complete the modification of asphalt, which further illustrates that the high-viscosity asphalt additive of the present invention can melt quickly and can significantly improve the performance of asphalt in a short enough time.

[0077] Moreover, even if the additives in the comparative example are completely melted after a long period of stirring to complete the modification of the asphalt, the performance of the high-viscosity asphalt obtained is still inferior to that of the embodiment; the additives in comparative examples 1-2 lack thermoplastic elastomers or toughening resins, and the various properties of the high-viscosity asphalts 9-10 obtained are significantly lower than those of the high-viscosity asphalt 1 in embodiment 1; and the amount of alcohol solvent in the additives in comparative example 3 is reduced to 20 parts, resulting in insufficient mixing of the thermoplastic elastomer and the toughening resin, and the performance of the high-viscosity asphalt 11 finally obtained is also reduced; in the additives in comparative example 4, n-heptane is used to replace the alcohol solvent, and the performance of the high-viscosity asphalt 12 obtained is also inferior to that of the high-viscosity asphalt 1 in embodiment 1; in general, the high-viscosity asphalt additive obtained by the present invention utilizes the synergistic effect of thermoplastic elastomers, toughening resins and alcohol solvents to significantly reduce the melting point of the additive, so that it has the characteristics of rapid melting, and can greatly improve the performance of the modified asphalt in a short period of time. These three components are indispensable.

[0078] Application Example 2

[0079] At the mixture level, stones of various sizes were mixed according to a mass ratio of 7mm basalt: 4mm basalt: 2mm basalt: = 40:40:15, and then heated to 185°C. 0.5wt% of high-viscosity particles based on the mass of the stone were added and dry-mixed with the stone for 90 seconds. Then, 5wt% of SBS1-D modified asphalt was added and mixed for 90 seconds. Finally, 5wt% of mineral powder was added and mixed for 90 seconds to complete the mixing of the asphalt mixture. Mixtures 1-12 were obtained, and Marshall specimens were formed to test the Marshall stability and scattering loss.

[0080] Performance testing

[0081] Marshall stability characterizes the strength of asphalt mixture, test method: T0709-2011;

[0082] Scattering loss characterizes the anti-loosening performance of the mixture, and is the core technical indicator of thin-layer overlay mixture: T0733-2011.

[0083] The test data are shown in Table 4;

[0084] Table 4 Mixture test data

[0085]

[0086] Analysis of the data in Table 5 shows that the high-viscosity asphalt additive of the present invention can complete the modification of asphalt in only 270 seconds of mixing the mixture, so that the mixture has better Marshall stability and scattering loss. Compared with the mixture without additive, the Marshall stability is improved from 4.56kN to between 9.56-10.31kN, and the scattering loss is reduced from 28.3% to between 5.5-6.5%; although the Marshall stability of the comparative example is also improved and the scattering loss is reduced, it is far less than that of the embodiment, indicating that the additive of the comparative example cannot complete the modification in such a short time like the additive of the embodiment.

[0087] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced therein.

Claims

1. A high-viscosity asphalt additive, characterized in that: The composition comprises the following components by weight: 30-50 parts of thermoplastic elastomer, 20-40 parts of toughening resin, 40-60 parts of alcohol solvent, 10-20 parts of polyethylene wax and 1-2 parts of polymerization inhibitor; The alcohol solvent is one or both of decanol and dodecanol.

2. The high-viscosity asphalt additive according to claim 1, characterized in that: The thermoplastic elastomer is one or more combinations of SBS, SEBS and SIS.

3. The high-viscosity asphalt additive according to claim 1, characterized in that: The toughening resin is one or both of ethylene methyl acrylate copolymer EMA and ethylene ethyl acrylate copolymer EEA.

4. The high-viscosity asphalt additive according to claim 1, characterized in that: The polymerization inhibitor is p-tert-butylcatechol.

5. The method for preparing a high-viscosity asphalt additive according to any one of claims 1 to 4, characterized in that: The specific steps include: Step 1: Heat the alcohol solvent to 180-190°C, add the thermoplastic elastomer and stir for 30-40 minutes to completely dissolve it; Step 2: Add toughening resin and polyethylene wax to the product of step 1, stir for 30-40 minutes, add polymerization inhibitor after the end, and cool naturally while stirring. Stop stirring when the temperature drops to 100°C, and continue to cool naturally to 50°C; Step 3: The product of step 2 is extruded into spherical particles with a diameter of 2-3 mm through a pellet extruder to obtain a high-viscosity asphalt additive.

6. The preparation method according to claim 5, characterized in that The stirring speed in step 1 is 600-1000 r / min; the stirring speed in step 2 is also 600-1000 r / min.

7. Use of the high-viscosity asphalt additive according to any one of claims 1 to 4 in preparing high-viscosity asphalt.

8. A high-viscosity asphalt, characterized in that: The high-viscosity asphalt contains 9-15 wt% of the high-viscosity asphalt additive according to any one of claims 1-4.

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