A high-tack pitch additive, a preparation method and use thereof, and a high-tack pitch

Abstract

The application belongs to the technical field of asphalt materials, and discloses a high-tack asphalt additive, a preparation method and use thereof, and high-tack asphalt. The high-tack asphalt additive comprises the following components in parts by mass: thermoplastic elastomer 30-50 parts, toughening resin 20-40 parts, alcohol solvent 40-60 parts, polyethylene wax 10-20 parts, and polymerization inhibitor 1-2 parts. The alcohol solvent is one or both of decanol and dodecanol. The alcohol solvent in the high-tack asphalt additive can dissolve the thermoplastic elastomer and the toughening resin well, so that the mixture is very uniform, thereby reducing the softening point and melting point of the resin mixture, and the additive has the characteristics of low melting point, rapid melting and stable performance. The modification of asphalt can be completed by adding the additive in the asphalt mixture mixing process. Meanwhile, the synergistic effect between the components significantly increases the comprehensive performance of the modified asphalt.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of asphalt materials, and particularly relates to a high-tack asphalt additive, a preparation method and use thereof, and high-tack asphalt. BACKGROUND

[0002] High-tack asphalt is currently widely used in ultra-thin overlay, drainage pavement, bridge deck pavement and other scenarios, and is increasingly widely used, and the demand for high-tack asphalt is also increasing. There are two mainstream technical routes for high-tack asphalt. One is factory-produced finished high-tack asphalt, which has high quality and stable and uniform performance, but requires a specific processing plant, and the processing plant needs to be transported to the construction site, which increases the cost of transportation and other expenses. The second technical route is to add high-tack particles to the storage tank of base asphalt or ordinary modified asphalt at the mixing station, or to directly add high-tack particles to the mixing cylinder during the mixing process to complete the modification. The representative technical products are TPS high-tack particles for Japanese drainage pavement and RST high-tack particles produced by Pudong Road and Bridge in China. The advantage of the additive is that the process of modifying ordinary asphalt to high-tack asphalt no longer requires a factory, and a small amount of demand or demand in remote areas can be easily met. It only needs to transport the additive to the asphalt mixing process to complete the high-tack modification of the asphalt. However, ordinary high-tack particles have some problems. When added to modified asphalt, they can only meet the technical requirements of ordinary high-tack asphalt and can meet the requirements of drainage pavement, but cannot meet the requirements of ultra-thin overlay and bridge deck pavement.

[0003] In view of this, the present application needs to solve the problem of how to prepare a high-tack asphalt additive. The high-tack asphalt additive is solid at room temperature, can be quickly melted when added during the asphalt mixing process to complete the modification, and can significantly improve the comprehensive performance of the asphalt to meet the use requirements of ultra-thin overlay and bridge deck pavement. SUMMARY

[0004] The present application aims to provide a high-tack asphalt additive. The high-tack asphalt additive comprises a thermoplastic elastomer, a toughening resin, an alcohol solvent, a polyethylene wax and a polymerization inhibitor. The alcohol solvent can well dissolve the thermoplastic elastomer and the toughening resin, making the mixture very uniform, 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. When added during the asphalt mixing process, the modification of the asphalt can be completed. At the same time, the synergistic effect between the components significantly improves the comprehensive performance of the modified asphalt.

[0005] Meanwhile, the present application also provides a preparation method, use and high-tack asphalt containing the high-tack asphalt additive.

[0006] To achieve the above object, the present application provides the following technical solutions.

[0007] The high-tackiness asphalt additive comprises the following components in parts by mass: thermoplastic elastomer 30-50 parts, toughening resin 20-40 parts, alcohol solvent 40-60 parts, polyethylene wax 10-20 parts, and polymerization inhibitor 1-2 parts.

[0008] In the research of the present application, it is found that the thermoplastic elastomer has a high softening point and melting point, while the toughening resin has a low softening point and melting point, and the alcohol solvent can well dissolve the thermoplastic elastomer and the toughening resin. After the three components are uniformly mixed, the softening point and melting point of the mixture resin can be significantly reduced, so that the additive can be added in the process of asphalt mixture mixing, and rapid melting can be realized only by using the temperature and mixing time in the mixing process, thus completing the modification of the asphalt. Unlike the traditional additive which needs to be added in the process of asphalt production to complete the modification, in addition, the alcohol solvent is selected as sunflower alcohol or dodecanol, which has 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, and the high boiling point can well reduce the volatilization of the solvent in the preparation process.

[0009] In addition, the high-tackiness asphalt additive of the present application significantly improves the comprehensive performance of the modified asphalt by the synergistic effect of the components.

[0010] Preferably, the thermoplastic elastomer is one or a combination 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-butyl catechol.

[0014] In addition, the present application also discloses a preparation method of the high-tackiness asphalt additive as described above, which specifically comprises the following steps:

[0015] Step 1: heat the alcohol solvent to 180-190℃, add the thermoplastic elastomer and stir for 30-40 min to completely dissolve it;

[0016] Step 2: add the toughening resin and polyethylene wax to the product of step 1, stir for 30-40 min, then add the polymerization inhibitor after the stirring is completed, and simultaneously perform natural cooling and stirring. Stop the stirring when the temperature drops to 100℃, and continue the natural cooling until the temperature drops to 50℃.

[0017] Step 3: The product of step 2 is extruded into spherical particles with a diameter of 2-3 mm by a particle extruder, and a high-viscosity asphalt additive is obtained.

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

[0019] In addition, the application also discloses a use of the high-viscosity asphalt additive in the preparation of high-viscosity asphalt.

[0020] Finally, the application discloses a high-viscosity asphalt containing 9-15 wt% of the high-viscosity asphalt additive.

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

[0022] The high-viscosity asphalt additive prepared by the application does not need to be added in the process of asphalt production, and the modification is completed through a long-time stirring and shearing process, and the high-viscosity asphalt additive has the characteristics of low melting point and rapid melting, and only needs to be added in the asphalt mixture mixing process, and the modification of the asphalt is completed by using the mixing temperature and time, so that the performance of the asphalt is significantly increased, and the application is extremely convenient and efficient. DETAILED DESCRIPTION

[0023] The technical solutions of the application will be described clearly and completely in combination with the embodiments of the application. Obviously, the described embodiments are only some of the embodiments of the application, but not all the embodiments. Based on the embodiments in the application, all the other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the application.

[0024] Product information

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

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

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

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

[0029] Ethylene methyl acrylate copolymer EMA: EMA produced by the United States DuPont Company, model 4170;

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

[0031] Decanol: Decanol D806660 produced by China National Medicine Macklin Chemical Reagents;

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

[0033] p-Tert-butyl catechol: p-Tert-butyl catechol B802140 produced by China National Medicine Macklin Chemical Reagents;

[0034] Polyethylene wax: Polyethylene wax P903665 produced by China National Medicine Macklin Reagents.

[0035] First part

[0036] The following examples and comparative examples, the preparation method is as shown below;

[0037] Step 1: Heat the alcohol solvent to 185℃, add the thermoplastic elastomer and stir for 35 min, the stirring speed is 800r / min, so that it is completely dissolved;

[0038] Step 2: Add toughening resin and polyethylene wax to the product of step 1, stir for 35 min, the stirring speed is 800r / min, after the end, add polymerization inhibitor, at the same time, natural cooling and stirring, the stirring speed is 800r / min, stop stirring when the temperature drops to 100℃, continue natural cooling to 50℃;

[0039] Step 3: The product of step 2 is extruded into spherical particles with a diameter of 3mm by a particle extruder, and a high viscosity asphalt additive is obtained.

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

[0041] Table 1 High viscosity asphalt additive formula table (mass fraction)

[0042]

[0043] Among them, the thermoplastic elastomer of example 3 is SIS, the thermoplastic elastomer of example 4 is SEBS, and the thermoplastic elastomer of the rest of the examples and comparative examples is SBS; The toughening resin of example 5 is EEA, and the toughening resin of the rest of the examples and comparative examples is EMA; The alcohol solvent of example 6 is dodecanol, and the alcohol solvent of the rest of the examples and comparative examples is dodecanol.

[0044] Example 7

[0045] The raw material composition is the same as that of example 1, and the difference is that the preparation method is:

[0046] Step 1: heat the alcohol solvent to 180℃, add the thermoplastic elastomer and stir for 30 min at 1000 r / min, so that it is completely dissolved;

[0047] Step 2: add the toughening resin and polyethylene wax to the product of Step 1 and stir for 30 min at 1000 r / min, then add the polymerization inhibitor after the stirring is completed, and simultaneously perform natural cooling and stirring at 1000 r / min; stop stirring when the temperature drops to 100℃, and continue natural cooling to 50℃;

[0048] Step 3: extrude the product of Step 2 into spherical particles with a diameter of 2 mm through a particle extruder, to obtain the high-viscosity asphalt additive.

[0049] Example 8

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

[0051] Step 1: heat the alcohol solvent to 190℃, add the thermoplastic elastomer and stir for 40 min at 600 r / min, so that it is completely dissolved;

[0052] Step 2: add the toughening resin and polyethylene wax to the product of Step 1 and stir for 40 min at 600 r / min, then add the polymerization inhibitor after the stirring is completed, and simultaneously perform natural cooling and stirring at 600 r / min; stop stirring when the temperature drops to 100℃, and continue natural cooling to 50℃;

[0053] Step 3: extrude the product of Step 2 into spherical particles with a diameter of 3 mm through a particle extruder, to obtain the high-viscosity asphalt additive.

[0054] Comparative Example 4

[0055] The same as in Example 1, except that the sunflower alcohol is replaced by n-heptane.

[0056] Second Part

[0057] Application Example 1

[0058] The high-viscosity asphalt additives of the examples and comparative examples are added to SBS1-D modified asphalt in a ratio of 13:100; the addition process is as follows: heat the SBS1-D modified asphalt to 185℃, then add the high-viscosity asphalt additive, and take the high-viscosity asphalt at 600-1000 rpm for 5 min and 1 h of stirring for testing.

[0059] Wherein, high tack pitch 1-8 corresponds to high tack pitch additive respectively is the high tack pitch additive of example 1-8, high tack pitch 9-12 corresponds to high tack pitch additive respectively is the corresponding high tack pitch additive of comparative example 1-4;

[0060] Performance test

[0061] Referring to the specification "highway engineering asphalt and asphalt mixture test procedures" JTGE20-2011, the high tack pitch 1-12 obtained is detected, wherein:

[0062] 5℃ ductility: 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 following table.

[0068] Table 2 high tack pitch detection data of stirring 5min

[0069]

[0070] Table 3 high tack pitch detection data of stirring 1h

[0071]

[0072] Note: dynamic viscosity test, specification requires that the upper limit of test range is 580,000, and the result exceeding 580,000 can be calculated by test theory.

[0073] According to the data analysis of table 2, when the high tack pitch additive is stirred with ordinary pitch for 5min, the high tack pitch corresponding to the additive of example 1-8 has good performance, its 5℃ ductility is >45cm, softening point is >97℃, 60℃ dynamic viscosity is >800,000Pa·s, and elastic recovery rate is >98%;

[0074] When the additive of comparative example is stirred with ordinary pitch for 5min, the modified pitch has 5℃ ductility between 31-37cm, softening point between 85-91℃, 60℃ dynamic viscosity between 10-25 million Pa·s, and elastic recovery rate between 92-94%.

[0075] In order to explore the modification effect of each high-viscosity asphalt additive on asphalt after complete melting, the additive is continuously stirred with ordinary asphalt for 1 h, and then sampling is performed for detection, and the results are shown in Table 3; analysis of the data in Table 3 shows that after stirring for 1 h, the performances of high-viscosity asphalt 1-8 have little difference; the performances of high-viscosity asphalt 9-12 are improved, especially the dynamic viscosity at 60℃;

[0076] The above data show that the high-viscosity asphalt additive prepared in the embodiment of the present application can complete the modification of asphalt in 5 min during the mixing process, indicating that it has the characteristics of low melting point and rapid melting; the performances of the high-viscosity asphalt obtained by the additive of the comparative example are lower after stirring for 5 min, and are far lower than those of the embodiment, but the performances of the high-viscosity asphalt obtained by the additive of the comparative example are improved after stirring for 1 h, indicating that the additive needs a long time to complete the modification of asphalt, which further indicates that the high-viscosity asphalt additive of the present application can be rapidly melted and can significantly improve the performance of asphalt in a short time.

[0077] Moreover, even if the additive of the comparative example is completely melted after a long time of stirring and completes the modification of asphalt, the performances of the high-viscosity asphalt obtained are still inferior to those of the embodiment; in the additive of comparative examples 1-2, the thermoplastic elastomer or toughening resin is absent, and the performances of the high-viscosity asphalt 9-10 obtained are obviously lower than those of the high-viscosity asphalt 1 of the embodiment 1; in the additive of comparative example 3, the amount of the alcohol solvent is reduced to 20 parts, resulting in insufficient mixing of the thermoplastic elastomer and the toughening resin, and the performances of the high-viscosity asphalt 11 obtained are also decreased; in the additive of comparative example 4, n-heptane is used to replace the alcohol solvent, and the performances of the high-viscosity asphalt 12 obtained are also inferior to those of the high-viscosity asphalt 1 of the embodiment 1; in general, the high-viscosity asphalt additive obtained by the present application utilizes the synergistic effect of the thermoplastic elastomer, the toughening resin and the alcohol solvent, significantly reduces the melting point of the additive, makes it have the characteristics of rapid melting, and can greatly improve the performance of modified asphalt in a short time, and the three components are indispensable.

[0078] Application Example 2

[0079] At the level of the mixture, the stone materials of different sizes are mixed according to the mass ratio of 7mm basalt:4mm basalt:2mm basalt:=40:40:15, heated to 185℃, and then 0.5wt% of the high-viscosity particles based on the mass of the stone materials are added and dry-mixed with the stone materials for 90s, and then 5wt% of the SBS1-D modified asphalt based on the mass of the stone materials is added and mixed for 90s, and finally 5wt% of the mineral powder is added and mixed for 90s, to complete the mixing of the asphalt mixture, to obtain mixtures 1-12, and Marshall test pieces are formed, and the Marshall stability and the flying loss are tested.

[0080] Performance detection

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

[0082] Flying loss characterizes the anti-loosening performance of mixture, the core technical index of thin layer surface mixture: T0733-2011.

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

[0084] Table 4 mixture detection data table

[0085]

[0086] It is concluded from the data in Table 5 that the high-viscosity asphalt additive of the present application can complete the modification of asphalt in only 270s of mixture mixing, so that the mixture has better Marshall stability and flying loss, compared with the mixture without additive, the Marshall stability is increased from 4.56kN to 9.56-10.31kN, and the flying loss is reduced from 28.3% to 5.5-6.5%; although the Marshall stability of the comparative example is also improved and the flying loss is reduced, it is far less than that of the example, which shows that the additive of the comparative example cannot complete the modification in such a short time as the additive of the example.

[0087] It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the examples should be regarded as exemplary and non-limiting in any respect, the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application.

Claims

1. A high-viscosity asphalt additive, characterized in that, By weight, it includes the following components: 30-50 parts thermoplastic elastomer, 20-40 parts toughening resin, 40-60 parts alcohol solvent, 10-20 parts polyethylene wax, and 1-2 parts polymerization inhibitor. The alcohol solvent is one or both of decanol and dodecanol; The thermoplastic elastomer is one or more of SBS, SEBS, and SIS; The toughening resin is one or both of ethylene methyl acrylate copolymer (EMA) and ethylene ethyl acrylate copolymer (EEA).

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

3. The method for preparing the high-viscosity asphalt additive according to any one of claims 1-2, characterized in that, Specifically, the following steps are included: Step 1: Heat the alcohol solvent to 180-190℃, add the thermoplastic elastomer and stir for 30-40 minutes until it is completely dissolved; Step 2: Add toughening resin and polyethylene wax to the product of Step 1, stir for 30-40 minutes, add polymerization inhibitor after stirring, and allow the mixture to cool naturally while stirring. Stop stirring when the temperature drops to 100℃, and continue to cool naturally to 50℃. Step 3: Extrude the product from Step 2 into spherical particles with a diameter of 2-3 mm using a particle extruder to obtain the high-viscosity asphalt additive.

4. The preparation method according to claim 3, 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.

5. Use of the high-viscosity asphalt additive as described in any one of claims 1-2 to prepare high-viscosity asphalt.

6. A high-viscosity asphalt, characterized in that, The high-viscosity asphalt contains 9-15 wt% of the high-viscosity asphalt additive as described in any one of claims 1-2.

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